WingHexExplorer2/3rdparty/qcodeedit2/lib/qeditor.cpp

/****************************************************************************
**
** Copyright (C) 2006-2009 fullmetalcoder <fullmetalcoder@hotmail.fr>
**
** This file is part of the Edyuk project <http://edyuk.org>
**
** This file may be used under the terms of the GNU General Public License
** version 3 as published by the Free Software Foundation and appearing in the
** file GPL.txt included in the packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "qeditor.h"

/*!
        \file qeditor.cpp
        \brief Implementation of the QEditor class
*/

#include "qdocument.h"
#include "qdocument_p.h"
#include "qdocumentcursor.h"
#include "qdocumentline.h"

#include "qcodecompletionengine.h"
#include "qlanguagedefinition.h"

#include "QMetaMethod"
#include "qcodeedit.h"
#include "qlinemarksinfocenter.h"
#include "qpanellayout.h"

#include "qreliablefilewatch.h"

#include <QAction>
#include <QActionGroup>
#include <QApplication>
#include <QClipboard>
#include <QDebug>
#include <QDrag>
#include <QFile>
#include <QFileDialog>
#include <QFileInfo>
#include <QKeyEvent>
#include <QMenu>
#include <QMessageBox>
#include <QMimeData>
#include <QPainter>
#include <QPointer>
#include <QPrintDialog>
#include <QPrinter>
#include <QRegularExpression>
#include <QScrollBar>
#include <QStyle>
#include <QTextStream>
#include <QTimer>

#define Q_SHORTCUT(a, s, c) a->setShortcut(QKeySequence(tr(s, c)))

#ifdef Q_GL_EDITOR
#include <QtOpenGLWidgets/QOpenGLWidget>
#endif

#define QCE_ACTION(name, action)                                               \
    {                                                                          \
        QAction *_a_ = m_actions.value(name);                                  \
        if (_a_)                                                               \
            _a_ action;                                                        \
    }
#define QCE_TR_ACTION(name, label)                                             \
    {                                                                          \
        QAction *_a_ = m_actions.value(name);                                  \
        if (_a_)                                                               \
            _a_->setText(label);                                               \
    }
#define QCE_ENABLE_ACTION(name, yes)                                           \
    {                                                                          \
        QAction *_a_ = m_actions.value(name);                                  \
        if (_a_)                                                               \
            _a_->setEnabled(yes);                                              \
    }

/*!
        \ingroup editor
        @{

        \class QEditor
        \brief A text editing widget

        QEditor is the central widget in QCE. It allows user to view and edit a
        document.

        QEditor has an API similar to that of QTextEdit and it behaves in a very
        similar way.

        Notable differences are :
        <ul>
        <li>QEditor can be given an InputBinding which can change the way it
        handle user inputs which enables such things as implementing emacs-like
        or Vi-like editing (almost) effortlessly.</li>
        <li>QEditor has actions instead of hard coded shortcuts and expose them
        so that, among other things, they can be easily added to menus/toolbars
        and their shortcuts can be changed</li>
        <li>QEditor brings the notion of cursor mirrors. Column selection and
        column editing are just special use case of cursor mirrors.</li>
        <li>QEditor brings the notion of placeholders, snippets-editing is just
        as special use case of placeholders.</li>
        <li>QEditor allows easy encodings management</li>
        </ul>

        QEditor can gain features when it is managed by a QCodeEdit class which
        is responsible for panels management.
*/

/*!
        \enum QEditor::CodecUpdatePolicy
        \brief Specify the actions to take when changing the default codec

*/

/*!
        \enum QEditor::EditFlag
        \brief Flag holding information about the state of an editor

        Some of these are public and can be modified freely and some
        others are only meant to be used internally though they can
        still be read.

*/

/*!
        \struct QEditor::PlaceHolder
        \brief A small structure holding placeholder data

        Placeholders are basically lists of cursors. When several palceholders
   coexist, it is possible to navigate among them using the key assigned to that
   function by the current input binding (CTRL+arrows by default).

        Each placeholder consist of a primary cursor and a list of mirrors
   (modeling the internals of QEditor and allowing extended snippet replacements
   easily).

        Additionaly a placeholder can have an Affector which allows the text of
   the mirrors to be modified in any imaginable way
*/

/*!
        \class QEditor::PlaceHolder::Affector
        \brief A small class allowing "placeholder scripting"

        The purpose of this class is to affect/process/reformat (whichever word
   you understand/like most) the content of placeholder mirrors.

        The main placeholder instance (primary cursor) will always contain the
   text typed by the user, only mirrors can be affected.

        To allow a large panel of processing to be done the affector is passed
   the following data : <ul> <li>A stringlist containing placeholder contents
   (primary cursor of all placeholders present in the editor) <li>The index of
   the current placeholder among these <li>The key event leading to a
   modification of the current placeholder <li>The index of the current mirror
                <li>A reference to the text of that placeholder mirror. This
   text has already been modified according to the key event. The original text
   can be retrieved from the first argument (stringlist). This text can be
   modified in any way you see fit or left as it is.
        </ul>
*/

////////////////////////////////////////////////////////////////////////
//	Bindings handling
////////////////////////////////////////////////////////////////////////

QList<QEditor *> QEditor::m_editors;

////////////////////////////////////////////////////////////////////////

/*!
        \return A pointer to the global "reliable" file monitor used by QEditor
   to avoid file conflicts

        The point of using a custom file watcher is to work around a bug
   (limitation) of QFileSystemWatcher which sometimes emit multiple signals for
   a single file save. It also enables to use a single object shared by all
   QEditor instances and reduce memory footprint.
*/
QReliableFileWatch *QEditor::watcher() {
    static QPointer<QReliableFileWatch> _qce_shared;

    if (!_qce_shared)
        _qce_shared = new QReliableFileWatch;

    return _qce_shared;
}

////////////////////////////////////////////////////////////////////////

int QEditor::m_defaultFlags = QEditor::AutoIndent | QEditor::AdjustIndent;
QString QEditor::m_defaultCodecName = {};

/*!
        \return The default flags set to every QEditor upon construction
        \note the default flags are a configuration-oriented feature which only
   expose "user" flags
*/
int QEditor::defaultFlags() { return m_defaultFlags; }

/*!
        \brief Set the default editor flags

        Setting editor flags result in them being applied to ALL existing
   editors and editors to be created later on.

        These can of course be modified on a per-editor basis later on.
*/
void QEditor::setDefaultFlags(int flags) {
    m_defaultFlags = flags & Accessible;

    for (auto &e : m_editors) {
        bool ontoWrap = (m_defaultFlags & LineWrap) && !(e->m_state & LineWrap);
        bool outOfWrap =
            !(m_defaultFlags & LineWrap) && (e->m_state & LineWrap);

        e->m_state &= Internal;
        e->m_state |= m_defaultFlags;

        if (ontoWrap) {
            e->document()->setWidthConstraint(e->wrapWidth());
        } else if (outOfWrap) {
            e->document()->clearWidthConstraint();
        }

        QAction *a = e->m_actions.value("wrap");

        if (a && (a->isChecked() != (bool)(e->m_state & LineWrap)))
            a->setChecked(e->m_state & LineWrap);
    }
}

QFont QEditor::defaultFont() { return QDocumentPrivate::m_defaultFont; }

void QEditor::setDefaultFont(const QFont &font) {
    QDocumentPrivate::m_defaultFont = font;
    for (auto &e : m_editors) {
        auto doc = e->document();
        doc->setFont(font);
    }
}

int QEditor::defaultTabStop() { return QDocumentPrivate::m_defaultTabStop; }

void QEditor::setDefaultTabStop(int tabstop) {
    if (tabstop <= 0) {
        return;
    }
    QDocumentPrivate::m_defaultTabStop = tabstop;
    for (auto &e : m_editors) {
        auto doc = e->document();
        doc->setTabStop(tabstop);
    }
}

QDocument::LineEnding QEditor::defaultLineEnding() {
    return QDocumentPrivate::m_defaultLineEnding;
}

void QEditor::setDefaultLineEnding(QDocument::LineEnding le) {
    QDocumentPrivate::m_defaultLineEnding = le;
    for (auto &e : m_editors) {
        auto doc = e->document();
        doc->setLineEnding(le);
    }
}

QDocument::WhiteSpaceMode QEditor::defaultShowSpaces() {
    return QDocumentPrivate::m_defaultShowSpaces;
}

void QEditor::setDefaultShowSpaces(QDocument::WhiteSpaceMode y) {
    QDocumentPrivate::m_defaultShowSpaces = y;
    for (auto &e : m_editors) {
        auto doc = e->document();
        doc->setShowSpaces(y);
    }
}

/*!
        \return The default text codec used to load and save document contents

        \note a null pointer indicates that local 8 bit encoding is used.
*/
QString QEditor::defaultCodecName() { return m_defaultCodecName; }

/*!
        \brief Set the default text codecName
        \param c codecName to use
        \param update Update policy

        The update policy determines whether existing editors are
        affected by the change of the default codecName.
*/
void QEditor::setDefaultCodec(const QString &name, int update) {
    for (auto &e : m_editors) {
        if (e->codecName() == m_defaultCodecName) {
            if (update & UpdateOld)
                e->setCodec(name);
        } else if (!e->codecName().isEmpty()) {
            if (update & UpdateCustom)
                e->setCodec(name);
        } else {
            if (update & UpdateDefault)
                e->setCodec(name);
        }
    }

    // qDebug("new codec is : 0x%x (%s)", c, c ? c->name().constData() :
    // "System");

    m_defaultCodecName = name;
}

/*!
        \brief ctor

        \note Creates builtin menus/actions
*/
QEditor::QEditor(QWidget *p)
    : QAbstractScrollArea(p), pMenu(nullptr), m_doc(nullptr),
      m_codec(m_defaultCodecName), m_definition(nullptr), m_curPlaceHolder(-1),
      m_state(defaultFlags()) {
    m_editors << this;

    m_saveState = Undefined;

    init();
}

/*!
        \brief ctor
        \param actions Whether builtin actions and menus should be created
*/
QEditor::QEditor(bool actions, QWidget *p)
    : QAbstractScrollArea(p), pMenu(nullptr), m_doc(nullptr),
      m_codec(m_defaultCodecName), m_definition(nullptr), m_curPlaceHolder(-1),
      m_state(defaultFlags()) {
    m_editors << this;

    m_saveState = Undefined;

    init(actions);
}

/*!
        \brief dtor
*/
QEditor::~QEditor() {
    m_editors.removeAll(this);

    if (m_completionEngine)
        delete m_completionEngine;

    if (m_editors.isEmpty()) {
        delete watcher();
    } else {
        watcher()->removeWatch(this);
    }
}

/*!
        \internal
*/
void QEditor::init(bool actions) {
#ifdef Q_GL_EDITOR
    setViewport(new QOpenGLWidget);
#endif

    viewport()->setCursor(Qt::IBeamCursor);
    viewport()->setBackgroundRole(QPalette::Base);
    // viewport()->setAttribute(Qt::WA_OpaquePaintEvent, true);
    viewport()->setAttribute(Qt::WA_KeyCompression, true);
    viewport()->setAttribute(Qt::WA_InputMethodEnabled, true);

    verticalScrollBar()->setSingleStep(1);
    horizontalScrollBar()->setSingleStep(20);

    setAcceptDrops(true);
    // setDragEnabled(true);
    setFrameShadow(QFrame::Plain);
    setFocusPolicy(Qt::WheelFocus);
    setAttribute(Qt::WA_KeyCompression, true);
    setAttribute(Qt::WA_InputMethodEnabled, true);

    connect(this, &QEditor::markChanged, QLineMarksInfoCenter::instance(),
            &QLineMarksInfoCenter::markChanged);

    m_doc = new QDocument(this);
    _docfont = m_doc->font();

    connect(m_doc, &QDocument::formatsChange, this, &QEditor::repaintContent);

    connect(m_doc, &QDocument::contentsChange, this, &QEditor::updateContent);

    connect(m_doc, &QDocument::formatsChanged, this,
            [=] { this->viewport()->update(); });

    connect(m_doc, &QDocument::widthChanged, this,
            &QEditor::documentWidthChanged);

    connect(m_doc, &QDocument::heightChanged, this,
            &QEditor::documentHeightChanged);

    connect(m_doc, &QDocument::cleanChanged, this, &QEditor::setContentClean);

    connect(m_doc, &QDocument::undoAvailable, this, &QEditor::undoAvailable);

    connect(m_doc, &QDocument::redoAvailable, this, &QEditor::redoAvailable);

    connect(m_doc, &QDocument::markChanged, this, &QEditor::emitMarkChanged);

    m_cursor = QDocumentCursor(m_doc);
    m_cursor.setAutoUpdated(true);

    pMenu = new QMenu;

    if (actions) {
        QAction *a, *sep;

        a = new QAction(QIcon(":/qeditor/undo.png"), tr("&Undo"), this);
        a->setObjectName("undo");
        Q_SHORTCUT(a, "Ctrl+Z", "Edit");
        a->setEnabled(false);
        connect(this, &QEditor::undoAvailable, a, &QAction::setEnabled);
        connect(a, &QAction::triggered, this, &QEditor::undo);

        addAction(a, "&Edit", "Edit");

        a = new QAction(QIcon(":/qeditor/redo.png"), tr("&Redo"), this);
        a->setObjectName("redo");
        Q_SHORTCUT(a, "Ctrl+Y", "Edit");
        a->setEnabled(false);
        connect(this, SIGNAL(redoAvailable(bool)), a, SLOT(setEnabled(bool)));
        connect(a, SIGNAL(triggered()), this, SLOT(redo()));

        addAction(a, "&Edit", "Edit");

        sep = new QAction(this);
        sep->setSeparator(true);
        addAction(sep, "&Edit", "Edit");

        a = new QAction(QIcon(":/qeditor/cut.png"), tr("Cu&t"), this);
        a->setObjectName("cut");
        Q_SHORTCUT(a, "Ctrl+X", "Edit");
        a->setEnabled(false);
        connect(this, SIGNAL(copyAvailable(bool)), a, SLOT(setEnabled(bool)));
        connect(a, SIGNAL(triggered()), this, SLOT(cut()));

        addAction(a, "&Edit", "Edit");

        a = new QAction(QIcon(":/qeditor/copy.png"), tr("&Copy"), this);
        a->setObjectName("copy");
        Q_SHORTCUT(a, "Ctrl+C", "Edit");
        a->setEnabled(false);
        connect(this, SIGNAL(copyAvailable(bool)), a, SLOT(setEnabled(bool)));
        connect(a, SIGNAL(triggered()), this, SLOT(copy()));

        addAction(a, "&Edit", "Edit");

        a = new QAction(QIcon(":/qeditor/paste.png"), tr("&Paste"), this);
        a->setObjectName("paste");
        // aPaste->setEnabled(QApplication::clipboard()->text().count());
        Q_SHORTCUT(a, "Ctrl+V", "Edit");
        connect(QApplication::clipboard(), SIGNAL(dataChanged()), this,
                SLOT(checkClipboard()));

        connect(a, SIGNAL(triggered()), this, SLOT(paste()));

        addAction(a, "&Edit", "Edit");

        sep = new QAction(this);
        sep->setSeparator(true);
        addAction(sep, "&Edit", "Edit");

        a = new QAction(tr("&Indent"), this);
        a->setObjectName("indent");
        Q_SHORTCUT(a, "Ctrl+I", "Edit");
        connect(a, SIGNAL(triggered()), this, SLOT(indentSelection()));

        addAction(a, "&Edit", "Edit");

        a = new QAction(tr("&Unindent"), this);
        a->setObjectName("unindent");
        Q_SHORTCUT(a, "Ctrl+Shift+I", "Edit");
        connect(a, SIGNAL(triggered()), this, SLOT(unindentSelection()));

        addAction(a, "&Edit", "Edit");

        sep = new QAction(this);
        sep->setSeparator(true);
        addAction(sep, "&Edit", "");

        a = new QAction(tr("Co&mment"), this);
        a->setObjectName("comment");
        Q_SHORTCUT(a, "Ctrl+D", "Edit");
        connect(a, SIGNAL(triggered()), this, SLOT(commentSelection()));

        addAction(a, "&Edit", "Edit");

        a = new QAction(tr("Unc&omment"), this);
        a->setObjectName("uncomment");
        Q_SHORTCUT(a, "Ctrl+Shift+D", "Edit");
        connect(a, SIGNAL(triggered()), this, SLOT(uncommentSelection()));

        addAction(a, "&Edit", "Edit");

        sep = new QAction(this);
        sep->setSeparator(true);
        addAction(sep, "&Edit", "");

        a = new QAction(tr("&Select all"), this);
        a->setObjectName("selectAll");
        Q_SHORTCUT(a, "Ctrl+A", "Edit");
        connect(a, SIGNAL(triggered()), this, SLOT(selectAll()));

        addAction(a, "&Edit", "Edit");

        sep = new QAction(this);
        sep->setSeparator(true);
        addAction(sep, QString());

        a = new QAction(QIcon(":/qeditor/find.png"), tr("&Find"), this);
        a->setObjectName("find");
        Q_SHORTCUT(a, "Ctrl+F", "Search");
        connect(a, SIGNAL(triggered()), this, SLOT(find()));

        addAction(a, "&Search", "Search");

        a = new QAction(QIcon(":/qeditor/replace.png"), tr("&Replace"), this);
        a->setObjectName("replace");
        Q_SHORTCUT(a, "Ctrl+R", "Search");
        connect(a, SIGNAL(triggered()), this, SLOT(replace()));

        addAction(a, "&Search", "Search");

        sep = new QAction(this);
        sep->setSeparator(true);
        addAction(sep, "&Search", "Search");

        a = new QAction(QIcon(":/qeditor/goto.png"), tr("&Goto line..."), this);
        a->setObjectName("goto");
        Q_SHORTCUT(a, "Ctrl+G", "Search");
        connect(a, SIGNAL(triggered()), this, SLOT(gotoLine()));

        addAction(a, "&Search", "Search");

        sep = new QAction(this);
        sep->setSeparator(true);
        addAction(sep, QString());
    }
}

/*!
        \return wether the flag \a f is set
*/
bool QEditor::flag(EditFlag f) const { return m_state & f; }

/*!
        \brief Sets the flag \a f
*/
void QEditor::setFlag(EditFlag f, bool b) {
    if (b) {
        m_state |= f;

        if (f == LineWrap) {
            if (isVisible())
                m_doc->setWidthConstraint(wrapWidth());

            m_cursor.refreshColumnMemory();

            QAction *a = m_actions.value("wrap");

            if (a && !a->isChecked())
                a->setChecked(true);
        }
    } else {
        m_state &= ~f;

        if (f == LineWrap) {
            if (isVisible())
                m_doc->clearWidthConstraint();

            m_cursor.refreshColumnMemory();

            QAction *a = m_actions.value("wrap");

            if (a && a->isChecked())
                a->setChecked(false);
        }
    }

    // TODO : only update cpos if cursor used to be visible?
    if (f == LineWrap)
        ensureCursorVisible();
}

/*!
        \return whether it is possible to call undo()
*/
bool QEditor::canUndo() const {
    return m_doc ? (m_undoRedoEnabled && m_doc->canUndo()) : false;
}

/*!
        \return whether it is possible to call redo()
*/
bool QEditor::canRedo() const {
    return m_doc ? (m_undoRedoEnabled && m_doc->canRedo()) : false;
}

/*!
        \brief Set line wrapping
        \param on line wrap on/off

        \note the function also enables "cursor movement within wrapped lines"
        which can be disabled manually using
   setFlag(QEditor::CursorJumpPastWrap, false);
*/
void QEditor::setLineWrapping(bool on) {
    setFlag(LineWrap, on);
    setFlag(CursorJumpPastWrap, on);
}

/*!
        \return The whole text being edited
*/
QString QEditor::text() const { return m_doc ? m_doc->text() : QString(); }

/*!
        \return The text at a given line
        \param line text line to extract, using C++ array conventions (start at
   zero)
*/
QString QEditor::text(int line) const {
    return m_doc ? m_doc->line(line).text() : QString();
}

/*!
        \brief Set the text of the underlying document and update display
*/
void QEditor::setText(const QString &s) {
    clearPlaceHolders();

    if (m_doc)
        m_doc->setText(s);

    setCursor(QDocumentCursor(m_doc));

    documentWidthChanged(m_doc->width());
    documentHeightChanged(m_doc->height());
    viewport()->update();
}

/*!
        \brief Save the underlying document to a file

        \see fileName()
*/
bool QEditor::save() {
    if (!m_doc)
        return false;

    QString oldFileName = fileName();

    if (fileName().isEmpty()) {
        QString fn = QFileDialog::getSaveFileName();

        if (fn.isEmpty())
            return false;

        setFileName(fn);
    } else if (isInConflict()) {
        int ret = QMessageBox::warning(
            this, tr("Conflict!"),
            tr("%1\nhas been modified by another application.\n"
               "Press \"Save\" to overwrite the file on disk\n"
               "Press \"Reset\"to be reload the file from disk.\n"
               "Press \"Discard\" to ignore this warning.\n")
                .arg(fileName()),
            QMessageBox::Save | QMessageBox::Reset | QMessageBox::Discard |
                QMessageBox::Cancel);
        if (ret == QMessageBox::Save) {
            m_saveState = Undefined;
        } else if (ret == QMessageBox::Reset) {
            load(fileName());
            m_saveState = Undefined;
            return false;
        } else if (ret == QMessageBox::Discard) {
            m_saveState = Undefined;
            return false;
        } else {
            return false;
        }
    }

    m_saveState = Saving;

    if (oldFileName.size()) {
        watcher()->removeWatch(oldFileName, this);
    }

    QFile f(fileName());

    if (!f.open(QFile::WriteOnly)) {
        m_saveState = Undefined;
        reconnectWatcher();

        return false;
    }

    // QTextStream s(&f);
    // s << text();
    QString txt =
        m_doc->text(flag(RemoveTrailing), flag(PreserveTrailingIndent));

    if (m_codec.size())
        f.write(QCE::convertByteArray(m_codec, txt));
    else
        f.write(txt.toLocal8Bit());

    m_doc->setClean();

    emit saved(this, fileName());
    m_saveState = Saved;

    QTimer::singleShot(100, this, SLOT(reconnectWatcher()));

    update();
    return true;
}

/*!
        \brief Save the content of the editor to a file

        \note This method renames the editor, stop monitoring the old
        file and monitor the new one
*/
bool QEditor::save(const QString &fn) {
    if (fileName().size()) {
        watcher()->removeWatch(fileName(), this);
    }

    QFile f(fn);

    if (!f.open(QFile::WriteOnly)) {
        m_saveState = Undefined;
        reconnectWatcher();

        return false;
    }

    QString txt =
        m_doc->text(flag(RemoveTrailing), flag(PreserveTrailingIndent));

    if (m_codec.size())
        f.write(QCE::convertByteArray(m_codec, txt));
    else
        f.write(txt.toLocal8Bit());

    m_doc->setClean();

    setFileName(fn);
    emit saved(this, fn);
    m_saveState = Saved;

    QTimer::singleShot(100, this, SLOT(reconnectWatcher()));
    return true;
}

/*!
        \internal
*/
void QEditor::checkClipboard() {
    // LOOKS LIKE THIS FUNCTION NEVER GETS CALLED DESPITE THE CONNECTION...

    // const QMimeData *d = QApplication::clipboard()->mimeData();

    // qDebug("checking clipboard : %s", d);

    // QCE_ENABLE_ACTION("paste", d && d->hasText())
}

/*!
        \internal
*/
void QEditor::reconnectWatcher() { watcher()->addWatch(fileName(), this); }

/*!
        \internal
*/
void QEditor::fileChanged(const QString &file) {
    if ((file != fileName()) || (m_saveState == Saving))
        return;

    /*
    if ( m_saveState == Saved )
    {
            qApp->processEvents();

            m_saveState = Undefined;
            return;
    }
    */

    if (!isContentModified()) {
        // silently reload file if the editor contains no modification?
        // -> result in undo/redo history loss, still ask confirmation ?
        bool autoReload = true;

        if (canUndo() || canRedo()) {
            int ret = QMessageBox::warning(
                this, tr("File changed"),
                tr("%1\nhas been modified by another application.\n\n"
                   "Undo/Redo stack would be discarded by the auto-reload.\n"
                   "Do you wish to keep up to date by reloading the file?")
                    .arg(fileName()),
                QMessageBox::Yes | QMessageBox::No);

            if (ret == QMessageBox::No)
                autoReload = false;
        }

        if (autoReload) {
            load(fileName());
            m_saveState = Undefined;
            return;
        }
    }

    // TODO : check for actual modification (using a checksum?)
    // TODO : conflict reversible (checksum again?)

    // qDebug("conflict!");
    m_saveState = Conflict;
}

/*!
        \return Whether a file conflict has been detected

        File conflicts happen when the loaded file is modified
        on disk by another application if the text has been
        modified in QCE
*/
bool QEditor::isInConflict() const { return m_saveState == Conflict; }

/*!
        \brief Print the content of the editor
*/
void QEditor::print() {
    if (!m_doc)
        return;

    QPrinter printer;

    // TODO : create a custom print dialog, page range sucks, lines range would
    // be better
    QPrintDialog dialog(&printer, this);
    dialog.setOptions(QPrintDialog::PrintToFile | QPrintDialog::PrintPageRange);

    if (dialog.exec() == QDialog::Accepted) {
        m_doc->print(&printer);
    }
}

/*!
        \brief Show the search/replace panel, if any
*/
void QEditor::find() {
    QCodeEdit *m = QCodeEdit::manager(this);

    if (m) {
        // makes sense hiding this one if present...
        m->sendPanelCommand("Goto", "hide");

        m->sendPanelCommand("Search", "display",
                            Q_COMMAND << Q_ARG(int, 1) << Q_ARG(bool, false));
    } else {
        qDebug("Unmanaged QEditor");
    }
}

/*!
        \brief Ask the search/replace panel, if any, to move to next match
*/
void QEditor::findNext() {
    QCodeEdit *m = QCodeEdit::manager(this);

    if (m) {
        // makes sense hiding this one if present...
        m->sendPanelCommand("Goto", "hide");

        m->sendPanelCommand("Search", "find", Q_COMMAND << Q_ARG(int, -1));

    } else {
        qDebug("Unmanaged QEditor");
    }
}

/*!
        \brief Show the search/replace panel, if any
*/
void QEditor::replace() {
    QCodeEdit *m = QCodeEdit::manager(this);

    if (m) {
        // makes sense hiding this one if present...
        m->sendPanelCommand("Goto", "hide");

        m->sendPanelCommand("Search", "display",
                            Q_COMMAND << Q_ARG(int, 1) << Q_ARG(bool, true));

    } else {
        qDebug("Unmanaged QEditor");
    }
}

/*!
        \brief Show a panel or dialog to go to a specific line
*/
void QEditor::gotoLine() {
    QCodeEdit *m = QCodeEdit::manager(this);

    if (m && m->hasPanel("Goto")) {
        // makes sense hiding this one if present...
        m->sendPanelCommand("Search", "hide");

        m->sendPanelCommand("Goto", "show");
    } else {
        qDebug("Unmanaged QEditor");
    }
}

/*!
        \brief Run time translation entry point for compat with Edyuk
*/
void QEditor::retranslate() {
    QCE_TR_ACTION("undo", tr("&Undo"))
    QCE_TR_ACTION("redo", tr("&Redo"))

    QCE_TR_ACTION("cut", tr("Cu&t"))
    QCE_TR_ACTION("copy", tr("&Copy"))
    QCE_TR_ACTION("paste", tr("&Paste"))

    QCE_TR_ACTION("indent", tr("&Indent"))
    QCE_TR_ACTION("unindent", tr("&Unindent"))
    QCE_TR_ACTION("comment", tr("Co&mment"))
    QCE_TR_ACTION("uncomment", tr("Unc&omment"))

    QCE_TR_ACTION("selectAll", tr("&Select all"))

    QCE_TR_ACTION("find", tr("&Find"))
    QCE_TR_ACTION("findNext", tr("Fin&d next"))
    QCE_TR_ACTION("replace", tr("&Replace"))

    QCE_TR_ACTION("goto", tr("&Goto line..."))

    if (m_completionEngine)
        m_completionEngine->retranslate();
}

/*!
        \return the action associated with a given name, if the QEditor has been
   created with actions on
*/
QAction *QEditor::action(const QString &s) {
    QHash<QString, QAction *>::const_iterator it = m_actions.constFind(s);

    return it != m_actions.constEnd() ? *it : 0;
}

/*!
        \brief Add an action to the editor
        \param a action to add
        \param menu if not empty (and if QCE is built with qmdilib support) the
   action will be added to that menu \param toolbar similar to \a menu but acts
   on toolbars

        \see removeAction()
*/
void QEditor::addAction(QAction *a, const QString &menu,
                        const QString &toolbar) {
    if (!a)
        return;

    QWidget::addAction(a);

    m_actions[a->objectName()] = a;

    if (pMenu && menu.size()) {
        pMenu->addAction(a);
    }
}

/*!
        \brief remove an action form the editor
        \param a action to add
        \param menu if not empty (and if QCE is built with qmdilib support) the
   action will be added to that menu \param toolbar similar to \a menu but acts
   on toolbars

        \see addAction()
*/
void QEditor::removeAction(QAction *a, const QString &menu,
                           const QString &toolbar) {
    if (!a)
        return;

    QWidget::removeAction(a);

    // m_actions.remove(a->objectName());

    if (pMenu)
        pMenu->removeAction(a);

    Q_UNUSED(menu)
    Q_UNUSED(toolbar)
}

/*!
        \brief load a text file
        \param file file to load

        If the file cannot be loaded, previous content is cleared.
*/
bool QEditor::load(const QString &file) {
    QFile f(file);

    // gotta handle line endings ourselves if we want to detect current line
    // ending style...
    // if ( !f.open(QFile::Text | QFile::ReadOnly) )
    if (!f.open(QFile::ReadOnly)) {
        setText(QString());
        return false;
    }

    const int size = f.size();
    // const int size = m_lastFileState.size = f.size();

    if (size < 500000) {
        // instant load for files smaller than 500kb
        QByteArray d = f.readAll();
        // m_lastFileState.checksum = qChecksum(d.constData(), d.size());
        if (m_codec.size())
            setText(QCE::convertString(m_codec, d));
        else
            setText(QString::fromLocal8Bit(d));
    } else {
        // load by chunks of 100kb otherwise to avoid huge peaks of memory usage
        // and driving mad the disk drivers

        int count = 0;
        QByteArray ba;

        m_doc->startChunkLoading();
        // m_lastFileState.checksum = 0;

        do {
            ba = f.read(100000);
            count += ba.size();

            // m_lastFileState.checksum ^= qChecksum(ba.constData(), ba.size());

            if (m_codec.size())
                m_doc->addChunk(QCE::convertString(m_codec, ba));
            else
                m_doc->addChunk(QString::fromLocal8Bit(ba));

        } while ((count < size) && ba.size());

        m_doc->stopChunkLoading();

        setCursor(QDocumentCursor(m_doc));

        documentWidthChanged(m_doc->width());
        documentHeightChanged(m_doc->height());
    }

    m_doc->setLastModified(QFileInfo(file).lastModified());

    // qDebug("checksum = %i", m_lastFileState.checksum);

    setFileName(file);

    emit loaded(this, file);
    return true;
}

/*!
        \return a pointer to the underlying QDocument object
*/
QDocument *QEditor::document() const { return m_doc; }

/*!
        \internal
*/
void QEditor::setDocument(QDocument *d) {
    if (d == nullptr) {
        return;
    }

    m_doc = d;
    documentWidthChanged(m_doc->width());
    documentHeightChanged(m_doc->height());
    setFileName(QString());
    m_cursor = *m_doc->editCursor();
}

/*!
        \return The text codecName to use for load/save operations
*/
QString QEditor::codecName() const { return m_codec; }

/*!
        \brief Set the text codec to use for load/save operations
*/
void QEditor::setCodec(const QString &c) {
    if (c == m_codec)
        return;

    if (c == QStringLiteral("ISO-8859-1")) {
        m_codec = QStringLiteral("ASCII");
    } else {
        if (!QCE::getEncodings().contains(c)) {
            return;
        }
        m_codec = c;
    }

    if (!fileName().isEmpty() && QFile::exists(fileName())) {
        if (!isContentModified()) {
            load(fileName());
        }
    } else {
        emit needLoading();
    }
}

/*!
        \brief Force a full re-highlighting of the document
*/
void QEditor::highlight() {
    m_doc->highlight();
    // updateContent(0, m_doc->lines());
}

/*!
        \return the current cursor
*/
QDocumentCursor QEditor::cursor() const {
    QDocumentCursor copy = m_cursor;
    copy.setAutoUpdated(false);
    return copy;
}

/*!
        \brief Set the document cursor
*/
void QEditor::setCursor(const QDocumentCursor &c) {
    repaintCursor();

    m_cursor = c.isValid() ? c : QDocumentCursor(m_doc);
    m_cursor.setAutoUpdated(true);
    clearCursorMirrors();

    if (m_curPlaceHolder != -1) {
        const PlaceHolder &ph = m_placeHolders[m_curPlaceHolder];

        if (!ph.cursor.isWithinSelection(m_cursor)) {
            m_curPlaceHolder = -1;
            viewport()->update();
        }
    }

    emitCursorPositionChanged();

    setFlag(CursorOn, true);
    repaintCursor();
    ensureCursorVisible();

    updateMicroFocus();
}

/*!
        \brief Set the cursor
        \param line document line to move the cursor to (start at zero)
        \param index column index of the new cursor (start at zero)
*/
void QEditor::setCursorPosition(int line, int index) {
    setCursor(QDocumentCursor(m_doc, line, index));
}

/*!
        \brief Write the current cursor position to to integers
*/
void QEditor::getCursorPosition(int &line, int &index) {
    line = m_cursor.lineNumber();
    index = m_cursor.columnNumber();
}

/*!
        \return the number of cursor mirrors currently used
*/
int QEditor::cursorMirrorCount() const { return m_mirrors.count(); }

/*!
        \return the cursor mirror at index \a i

        Index has no extra meaning : you cannot deduce anything about
        the cursor mirror it corresponds to from it. For instance, the
        cursor mirror at index 0 is neither the first mirror added nor
        the one at smallest document position (well : it *might* be but
        that would be a coincidence...)
*/
QDocumentCursor QEditor::cursorMirror(int i) const {
    return i >= 0 && i < m_mirrors.count() ? m_mirrors.at(i)
                                           : QDocumentCursor();
}

/*!
        \brief Clear all placeholders
*/
void QEditor::clearPlaceHolders() {
    bool updateView = m_placeHolders.count() && m_curPlaceHolder != -1;

    m_curPlaceHolder = -1;

    for (int i = 0; i < m_placeHolders.count(); ++i) {
        PlaceHolder &ph = m_placeHolders[i];

        ph.cursor.setAutoUpdated(false);

        for (int j = 0; j < ph.mirrors.count(); ++j) {
            ph.mirrors[j].setAutoUpdated(false);
        }

        ph.mirrors.clear();
    }

    m_placeHolders.clear();

    if (updateView)
        viewport()->update();
}

/*!
        \brief Add a placeholder
        \param p placeholder data
        \param autoUpdate whether to force auto updating of all cursors used by
   the placeholder

        Auto update is on by default and it is recommended not to disable it
   unless you know what you are doing.
*/
void QEditor::addPlaceHolder(const PlaceHolder &p, bool autoUpdate) {
    m_placeHolders << p;

    PlaceHolder &ph = m_placeHolders.last();

    ph.cursor.setAutoUpdated(autoUpdate);
    ph.cursor.movePosition(ph.length, QDocumentCursor::NextCharacter,
                           QDocumentCursor::KeepAnchor);

    for (int i = 0; i < ph.mirrors.count(); ++i) {
        ph.mirrors[i].setAutoUpdated(autoUpdate);
        ph.mirrors[i].movePosition(ph.length, QDocumentCursor::NextCharacter,
                                   QDocumentCursor::KeepAnchor);
    }
}

/*!
        \brief Remove a placeholder
        \param i placeholder index

        \note if the current placeholder is removed there will be NO automatic
   switching to a remaining one.
*/
void QEditor::removePlaceHolder(int id) {
    if (id == m_curPlaceHolder)
        clearCursorMirrors();

    PlaceHolder &ph = m_placeHolders[id];

    for (int i = 0; i < ph.mirrors.count(); ++i)
        ph.mirrors[i].setAutoUpdated(false);

    ph.mirrors.clear();
    ph.cursor.setAutoUpdated(false);
    m_placeHolders.removeAt(id);

    if (id < m_curPlaceHolder)
        --m_curPlaceHolder;
}

/*!
        \return the number of placeholders currently set
*/
int QEditor::placeHolderCount() const { return m_placeHolders.count(); }

/*!
        \return the id of the current placeholder
*/
int QEditor::currentPlaceHolder() const { return m_curPlaceHolder; }

/*!
        \brief Set the current placeholder to use

        This function change the cursor and the cursor mirrors.
*/
void QEditor::setPlaceHolder(int i) {
    if (i < 0 || i >= m_placeHolders.count())
        return;

    clearCursorMirrors();

    const PlaceHolder &ph = m_placeHolders.at(i);
    QDocumentCursor cc = ph.cursor;

    setCursor(cc);

    /*
            ditch cursor mirrors in favor of
       QDocumentCursor::replaceSelectedText()

                    * workaround mirror limitations re movement (no way to
       ensure proper synchronization when moving up/down)

                    * make it relatively easy to implement affectors
    */

    m_curPlaceHolder = i;

    viewport()->update();
}

void QEditor::setUndoRedoEnabled(bool b) { m_undoRedoEnabled = b; }

void QEditor::setCursorMirrorEnabled(bool b) {
    m_cursorMirrorEnabled = b;
    if (!b) {
        clearCursorMirrors();
    }
}

/*!
        \brief Move to next placeholder

        \see setPlaceHolder
*/
void QEditor::nextPlaceHolder() {
    if (m_placeHolders.isEmpty())
        return;

    ++m_curPlaceHolder;

    if (m_curPlaceHolder >= m_placeHolders.count())
        m_curPlaceHolder = 0;

    setPlaceHolder(m_curPlaceHolder);
}

/*!
        \brief Move to previous placeholder

        \see setPlaceHolder
*/
void QEditor::previousPlaceHolder() {
    if (m_placeHolders.isEmpty())
        return;

    if (m_curPlaceHolder <= 0)
        m_curPlaceHolder = m_placeHolders.count();

    --m_curPlaceHolder;

    setPlaceHolder(m_curPlaceHolder);
}

/*!
        \return the code completion engine set to this editor, if any
*/
QCodeCompletionEngine *QEditor::completionEngine() const {
    return m_completionEngine;
}

/*!
        \brief Set a code completion engine to the editor

        \warning Most completion engines can only be attached
        to a single editor due to issues in the widget used to
        dispaly matches so you got to clone them and, as a consequence
        QEditor will take ownership of the completion engines
        and delete them.
*/
void QEditor::setCompletionEngine(QCodeCompletionEngine *e) {
    if (m_completionEngine) {
        m_completionEngine->setEditor(nullptr);
        m_completionEngine->deleteLater();
    }

    m_completionEngine = e;

    if (m_completionEngine) {
        m_completionEngine->setEditor(this);
    }
}

void QEditor::setScaleRate(qreal rate) {
    _scaleRate = rate;
    if (!m_doc)
        return;

    auto f = _docfont;
    f.setPointSizeF(f.pointSizeF() * _scaleRate);
    m_doc->setFont(f);
    emit zoomed();
    update();
}

qreal QEditor::scaleRate() const { return _scaleRate; }

/*!
        \return the language definition set to this editor, if any
*/
QLanguageDefinition *QEditor::languageDefinition() const {
    return m_definition;
}

/*!
        \brief Set a language definition to the editor
*/
void QEditor::setLanguageDefinition(QLanguageDefinition *d) {
    m_definition = d;

    if (m_doc)
        m_doc->setLanguageDefinition(d);

    if (m_definition) {
        bool cuc = d->singleLineComment().size();

        QCE_ENABLE_ACTION("comment", cuc)
        QCE_ENABLE_ACTION("uncomment", cuc)
    } else {
        QCE_ENABLE_ACTION("comment", false)
        QCE_ENABLE_ACTION("uncomment", false)
    }
}

/*!
        \return the line at a given viewport position
*/
QDocumentLine QEditor::lineAtPosition(const QPoint &p) const {
    return m_doc ? m_doc->lineAt(p) : QDocumentLine();
}

/*!
        \return The cursor object nearest to the given viewport position
*/
QDocumentCursor QEditor::cursorForPosition(const QPoint &p) const {
    // qDebug("cursor for : (%i, %i)", p.x(), p.y());

    return m_doc ? m_doc->cursorAt(p) : QDocumentCursor();
}

/*!
        \brief Set the cursor to that nearest to a given viewport position
*/
void QEditor::setCursorPosition(const QPoint &p) {
    // qDebug("cursor for : (%i, %i)", p.x(), p.y());

    QDocumentCursor c = cursorForPosition(p);

    if (c.isValid()) {
        setCursor(c);
    }
}

/*!
        \brief Emitted whenever the position of the cursor changes
*/
void QEditor::emitCursorPositionChanged() {
    emit cursorPositionChanged();
    emit copyAvailable(m_cursor.hasSelection());

    if (m_definition)
        m_definition->match(m_cursor);

    if (m_doc->impl()->hasMarks())
        QLineMarksInfoCenter::instance()->cursorMoved(this);
}

/*!
        \brief Undo the last editing operation, if any on the stack
*/
void QEditor::undo() {
    if (flag(ReadOnly)) {
        return;
    }

    if (m_doc && m_undoRedoEnabled) {
        if (m_definition)
            m_definition->clearMatches(m_doc);

        m_doc->undo();

        ensureCursorVisible();
        setFlag(CursorOn, true);
        emitCursorPositionChanged();
        repaintCursor();
    }
}

/*!
        \brief Redo the last undone editing operation, if any on the stack
*/
void QEditor::redo() {
    if (flag(ReadOnly)) {
        return;
    }

    if (m_doc && m_undoRedoEnabled) {
        if (m_definition)
            m_definition->clearMatches(m_doc);

        m_doc->redo();

        ensureCursorVisible();
        setFlag(CursorOn, true);
        emitCursorPositionChanged();
        repaintCursor();
    }
}

/*!
        \brief Cut the selected text, if any
*/
void QEditor::cut() {
    if (flag(ReadOnly)) {
        return;
    }

    copy();

    bool macro = m_mirrors.count();

    if (macro)
        m_doc->beginMacro();

    m_cursor.removeSelectedText();

    for (int i = 0; i < m_mirrors.count(); ++i)
        m_mirrors[i].removeSelectedText();

    if (macro)
        m_doc->endMacro();

    clearCursorMirrors();

    ensureCursorVisible();
    setFlag(CursorOn, true);
    emitCursorPositionChanged();
    repaintCursor();
}

/*!
        \brief Copy the selected text, if any

        \note Column selection may be created but the can only be copied
   properly in a QCE editor
*/
void QEditor::copy() {
    if (!m_cursor.hasSelection())
        return;

    QMimeData *d = createMimeDataFromSelection();
    QApplication::clipboard()->setMimeData(d);

    // qDebug("%s", qPrintable(m_cursor.selectedText()));
    // QApplication::clipboard()->setText(m_cursor.selectedText());
}

/*!
        \brief Paste text from the clipboard to the current cursor position

        \note May paste column selections from other QCE editors
*/
void QEditor::paste() {
    if (flag(ReadOnly)) {
        return;
    }

    const QMimeData *d = QApplication::clipboard()->mimeData();

    if (d)
        insertFromMimeData(d);
}

void QEditor::clear() {
    m_doc->clear();
    m_cursor = *m_doc->editCursor();
}

static void insert(const QDocumentCursor &cur, const QString &txt) {
    QDocumentCursor c(cur);
    c.setSilent(true);
    c.setColumnNumber(0);
    c.insertText(txt);
}

static void removeFromStart(const QDocumentCursor &cur, const QString &txt) {
    QDocumentLine l = cur.line();
    int pos = l.firstChar();

    if (l.text().mid(pos, txt.length()) != txt)
        return;

    QDocumentCursor c(cur.document(), cur.lineNumber(), pos);
    c.setSilent(true);
    c.movePosition(txt.length(), QDocumentCursor::NextCharacter,
                   QDocumentCursor::KeepAnchor);
    c.removeSelectedText();
}

/*!
        \brief Indent the selection
*/
void QEditor::indentSelection() {
    // TODO : respect tab stops in case of screwed up indent (correct it?)
    if (flag(ReadOnly)) {
        return;
    }

    QString txt =
        flag(ReplaceTabs) ? QString(m_doc->tabStop(), ' ') : QString("\t");

    if (m_mirrors.count()) {
        m_doc->beginMacro();

        if (!protectedCursor(m_cursor))
            insert(m_cursor, txt);

        for (auto &m : m_mirrors)
            if (!protectedCursor(m))
                insert(m, txt);

        m_doc->endMacro();

    } else if (!m_cursor.hasSelection()) {
        if (!protectedCursor(m_cursor))
            insert(m_cursor, txt);
    } else if (!protectedCursor(m_cursor)) {
        QDocumentSelection s = m_cursor.selection();
        QDocumentCursor c(m_doc, s.startLine);
        c.setSilent(true);
        c.beginEditBlock();

        while (c.isValid() && (c.lineNumber() <= s.endLine)) {
            c.insertText(txt);
            c.movePosition(1, QDocumentCursor::NextLine);

            if (c.atEnd())
                break;
        }

        c.endEditBlock();
    }
}

/*!
        \brief Unindent the selection
*/
void QEditor::unindentSelection() {
    if (flag(ReadOnly)) {
        return;
    }

    if (!m_cursor.line().firstChar())
        return;

    if (m_mirrors.count()) {
        m_doc->beginMacro();

        if (!protectedCursor(m_cursor))
            unindent(m_cursor);

        for (auto &m : m_mirrors)
            unindent(m);

        m_doc->endMacro();

    } else if (!m_cursor.hasSelection()) {
        unindent(m_cursor);
    } else if (!protectedCursor(m_cursor)) {
        QDocumentSelection s = m_cursor.selection();

        m_doc->beginMacro();

        for (int i = s.startLine; i <= s.endLine; ++i) {
            unindent(QDocumentCursor(m_doc, i));
        }

        m_doc->endMacro();
    }
}

/*!
        \brief Comment the selection (or the current line) using single line
   comments supported by the language
*/
void QEditor::commentSelection() {
    if (!m_definition)
        return;

    QString txt = m_definition->singleLineComment();

    if (txt.isEmpty())
        return;

    if (m_mirrors.count()) {
        m_doc->beginMacro();

        if (!protectedCursor(m_cursor))
            insert(m_cursor, txt);

        for (auto &m : m_mirrors)
            if (!protectedCursor(m))
                insert(m, txt);

        m_doc->endMacro();

    } else if (!m_cursor.hasSelection()) {
        if (!protectedCursor(m_cursor))
            insert(m_cursor, txt);
    } else if (!protectedCursor(m_cursor)) {
        QDocumentSelection s = m_cursor.selection();
        QDocumentCursor c(m_doc, s.startLine);
        c.setSilent(true);
        c.beginEditBlock();

        while (c.isValid() && (c.lineNumber() <= s.endLine)) {
            c.insertText(txt);
            c.movePosition(1, QDocumentCursor::NextLine);

            if (c.atEnd())
                break;
        }

        c.endEditBlock();
    }
}

/*!
        \brief Uncomment the selection (or current line), provided it has
   been commented with single line comments
*/
void QEditor::uncommentSelection() {
    if (!m_definition)
        return;

    QString txt = m_definition->singleLineComment();

    if (txt.isEmpty())
        return;

    if (m_mirrors.count()) {
        m_doc->beginMacro();

        if (!protectedCursor(m_cursor))
            removeFromStart(m_cursor, txt);

        for (auto &m : m_mirrors)
            if (!protectedCursor(m))
                removeFromStart(m, txt);

        m_doc->endMacro();

    } else if (!m_cursor.hasSelection()) {
        if (!protectedCursor(m_cursor))
            removeFromStart(m_cursor, txt);
    } else if (!protectedCursor(m_cursor)) {
        QDocumentSelection s = m_cursor.selection();

        m_doc->beginMacro();

        for (int i = s.startLine; i <= s.endLine; ++i) {
            removeFromStart(QDocumentCursor(m_doc, i), txt);
        }

        m_doc->endMacro();
    }
}

/*!
        \brief Select the whole text
*/
void QEditor::selectAll() {
    clearCursorMirrors();

    m_cursor.movePosition(1, QDocumentCursor::Start);
    m_cursor.movePosition(1, QDocumentCursor::End, QDocumentCursor::KeepAnchor);

    emitCursorPositionChanged();

    viewport()->update();
}

/*!
        \internal
*/
bool QEditor::event(QEvent *e) {
    bool r = QAbstractScrollArea::event(e);

    if ((e->type() == QEvent::Resize || e->type() == QEvent::Show) && m_doc)
        verticalScrollBar()->setMaximum(
            qMax(0, 1 + (m_doc->height() - viewport()->height()) /
                            m_doc->fontMetrics().lineSpacing()));

    if (e->type() == QEvent::Resize && flag(LineWrap) && m_doc) {
        // qDebug("resize adjust (1) : wrapping to %i",
        // viewport()->width());
        m_doc->setWidthConstraint(wrapWidth());
        ensureCursorVisible();
    }

    return r;
}

/*!
        \internal
*/
void QEditor::paintEvent(QPaintEvent *e) {
    if (!m_doc)
        return;

    QPainter p(viewport());
    const int yOffset = verticalOffset();
    const int xOffset = horizontalOffset();

#ifdef Q_GL_EDITOR
    // QRect r(e->rect());
    QRect r(0, 0, viewport()->width(), viewport()->height());
#else
    QRect r(e->rect());
#endif

    // qDebug() << r;

    // p.setClipping(false);
    p.translate(-xOffset, -yOffset);

    QDocument::PaintContext ctx;
    ctx.xoffset = xOffset;
    ctx.yoffset = r.y() + yOffset;
    ctx.width = viewport()->width();
    ctx.height = qMin(r.height(), viewport()->height());
    ctx.palette = palette();
    ctx.cursors << m_cursor.handle();
    ctx.fillCursorRect = true;
    ctx.blinkingCursor = flag(CursorOn);

    if (m_cursor.hasSelection()) {
        // qDebug("atempting to draw selected text");
        QDocumentSelection s = m_cursor.selection();

        ctx.selections << s;
    }

    // cursor mirrors :D
    for (auto &m : m_mirrors) {
        if (ctx.blinkingCursor)
            ctx.extra << m.handle();

        if (m.hasSelection()) {
            QDocumentSelection s = m.selection();

            ctx.selections << s;
        }
    }

    if (m_dragAndDrop.isValid()) {
        ctx.extra << m_dragAndDrop.handle();
    }

    p.save();
    m_doc->draw(&p, ctx);
    p.restore();

    if (m_curPlaceHolder >= 0 && m_curPlaceHolder < m_placeHolders.count()) {
        const PlaceHolder &ph = m_placeHolders.at(m_curPlaceHolder);

        p.setPen(Qt::red);
        p.drawConvexPolygon(ph.cursor.documentRegion());

        p.setPen(Qt::yellow);
        for (const QDocumentCursor &m : ph.mirrors) {
            if (m.isValid())
                p.drawConvexPolygon(m.documentRegion());
        }
    }

    if (viewport()->height() > m_doc->height()) {
        p.fillRect(0, m_doc->height(), viewport()->width(),
                   viewport()->height() - m_doc->height(), palette().base());
    }
}

/*!
        \internal
*/
void QEditor::timerEvent(QTimerEvent *e) {
    int id = e->timerId();

    if (id == m_blink.timerId()) {
        bool on = !flag(CursorOn);

        if (m_cursor.hasSelection())
            on &= style()->styleHint(QStyle::SH_BlinkCursorWhenTextSelected, 0,
                                     this) != 0;

        setFlag(CursorOn, on);

        repaintCursor();

    } else if (id == m_drag.timerId()) {
        m_drag.stop();
        // startDrag();
    } else if (id == m_click.timerId()) {
        m_click.stop();
    }
}

static int max(const QList<QDocumentCursor> &l) {
    int ln = 0;

    for (const QDocumentCursor &c : l)
        if (c.lineNumber() > ln)
            ln = c.lineNumber();

    return ln;
}

static int min(const QList<QDocumentCursor> &l) {
    // beware the sign bit...
    int ln = 0x7fffffff;

    for (const QDocumentCursor &c : l)
        if ((c.lineNumber() < ln) || (ln < 0))
            ln = c.lineNumber();

    return ln;
}

bool QEditor::protectedCursor(const QDocumentCursor &c) const {
    if (c.hasSelection()) {
        int line = qMin(c.lineNumber(), c.anchorLineNumber()),
            end = qMax(c.lineNumber(), c.anchorLineNumber());

        while (line <= end) {
            if (m_doc->line(line).hasAnyFlag(
                    QDocumentLine::Hidden | QDocumentLine::CollapsedBlockStart |
                    QDocumentLine::CollapsedBlockEnd))
                return true;

            ++line;
        }

    } else {
        return m_doc->line(c.lineNumber())
            .hasAnyFlag(QDocumentLine::Hidden |
                        QDocumentLine::CollapsedBlockStart |
                        QDocumentLine::CollapsedBlockEnd);
    }

    return false;
}

void QEditor::createSimpleBasicContextMenu(bool shortcut, bool extTool) {
    if (pMenu == nullptr) {
        pMenu = new QMenu(this);
    }

    QAction *a = nullptr, *sep = nullptr;

    if (m_undoRedoEnabled) {
        a = new QAction(QIcon(":/qeditor/undo.png"), tr("&Undo"), this);
        a->setObjectName("undo");
        if (shortcut)
            Q_SHORTCUT(a, "Ctrl+Z", "Edit");
        a->setEnabled(false);
        connect(this, &QEditor::undoAvailable, a, &QAction::setEnabled);
        connect(a, &QAction::triggered, this, &QEditor::undo);

        addAction(a, "&Edit", "Edit");

        a = new QAction(QIcon(":/qeditor/redo.png"), tr("&Redo"), this);
        a->setObjectName("redo");
        if (shortcut)
            Q_SHORTCUT(a, "Ctrl+Y", "Edit");
        a->setEnabled(false);
        connect(this, SIGNAL(redoAvailable(bool)), a, SLOT(setEnabled(bool)));
        connect(a, SIGNAL(triggered()), this, SLOT(redo()));

        addAction(a, "&Edit", "Edit");
    }

    sep = new QAction(this);
    sep->setSeparator(true);
    addAction(sep, "&Edit", "Edit");

    if (!flag(ReadOnly)) {
        a = new QAction(QIcon(":/qeditor/cut.png"), tr("Cu&t"), this);
        a->setObjectName("cut");
        if (shortcut)
            Q_SHORTCUT(a, "Ctrl+X", "Edit");
        a->setEnabled(false);
        connect(this, SIGNAL(copyAvailable(bool)), a, SLOT(setEnabled(bool)));
        connect(a, SIGNAL(triggered()), this, SLOT(cut()));

        addAction(a, "&Edit", "Edit");
    }

    a = new QAction(QIcon(":/qeditor/copy.png"), tr("&Copy"), this);
    a->setObjectName("copy");
    if (shortcut)
        Q_SHORTCUT(a, "Ctrl+C", "Edit");
    a->setEnabled(false);
    connect(this, SIGNAL(copyAvailable(bool)), a, SLOT(setEnabled(bool)));
    connect(a, SIGNAL(triggered()), this, SLOT(copy()));

    addAction(a, "&Edit", "Edit");

    if (!flag(ReadOnly)) {
        a = new QAction(QIcon(":/qeditor/paste.png"), tr("&Paste"), this);
        a->setObjectName("paste");
        if (shortcut)
            Q_SHORTCUT(a, "Ctrl+V", "Edit");
        connect(QApplication::clipboard(), SIGNAL(dataChanged()), this,
                SLOT(checkClipboard()));

        connect(a, SIGNAL(triggered()), this, SLOT(paste()));

        addAction(a, "&Edit", "Edit");
    }

    if (extTool) {
        sep = new QAction(this);
        sep->setSeparator(true);
        addAction(sep, QString());

        a = new QAction(QIcon(":/qeditor/find.png"), tr("&Find"), this);
        a->setObjectName("find");
        if (shortcut)
            Q_SHORTCUT(a, "Ctrl+F", "Search");
        connect(a, SIGNAL(triggered()), this, SLOT(find()));

        addAction(a, "&Search", "Search");

        a = new QAction(tr("Fin&d next"), pMenu);
        a->setObjectName("findNext");
        if (shortcut)
            Q_SHORTCUT(a, "F3", "Search");
        connect(a, SIGNAL(triggered()), this, SLOT(findNext()));

        addAction(a, "&Search", "Search");

        a = new QAction(QIcon(":/qeditor/replace.png"), tr("&Replace"), this);
        a->setObjectName("replace");
        Q_SHORTCUT(a, "Ctrl+R", "Search");
        connect(a, SIGNAL(triggered()), this, SLOT(replace()));

        addAction(a, "&Search", "Search");

        sep = new QAction(this);
        sep->setSeparator(true);
        addAction(sep, "&Search", "Search");

        a = new QAction(QIcon(":/qeditor/goto.png"), tr("&Goto line..."), this);
        a->setObjectName("goto");
        if (shortcut)
            Q_SHORTCUT(a, "Ctrl+G", "Search");
        connect(a, SIGNAL(triggered()), this, SLOT(gotoLine()));

        addAction(a, "&Search", "Search");
    }
}

/*!
        \internal
*/
void QEditor::keyPressEvent(QKeyEvent *e) {
    forever {
        bool leave = false;

        // try mirrors bindings first
        if ((e->modifiers() & Qt::AltModifier) &&
            (e->modifiers() & Qt::ControlModifier)) {
            int ln = -1;
            QDocumentLine l;

            if (e->key() == Qt::Key_Up) {
                ln = m_cursor.lineNumber();

                if (m_mirrors.count())
                    ln = qMin(ln, min(m_mirrors));

                // qDebug("first %i", ln);

                l = m_doc->line(--ln);
            } else if (e->key() == Qt::Key_Down) {
                ln = m_cursor.lineNumber();

                if (m_mirrors.count())
                    ln = qMax(ln, max(m_mirrors));

                l = m_doc->line(++ln);
            }

            if (l.isValid()) {
                addCursorMirror(
                    QDocumentCursor(m_doc, ln, m_cursor.anchorColumnNumber()));
                repaintCursor();
                emitCursorPositionChanged();

                break;
            }
        }

        // placeholders handling
        bool bHandled = false;

        if (m_placeHolders.count() && e->modifiers() == Qt::ControlModifier) {
            if (e->key() == Qt::Key_Up || e->key() == Qt::Key_Left) {
                bHandled = true;
                previousPlaceHolder();
            } else if (e->key() == Qt::Key_Down || e->key() == Qt::Key_Right) {
                bHandled = true;
                nextPlaceHolder();
            }
        }

        // default shortcuts
        if (e->matches(QKeySequence::Undo)) {
            if (flag(ReadOnly)) {
                e->ignore();
                return;
            }
            undo();
            break;
        } else if (e->matches(QKeySequence::Redo)) {
            if (flag(ReadOnly)) {
                e->ignore();
                return;
            }
            redo();
            break;
        } else if (e->matches(QKeySequence::Copy)) {
            copy();
            break;
        } else if (e->matches(QKeySequence::Paste)) {
            if (flag(ReadOnly)) {
                e->ignore();
                return;
            }
            paste();
            break;
        } else if (e->matches(QKeySequence::Cut)) {
            if (flag(ReadOnly)) {
                e->ignore();
                return;
            }
            cut();
            break;
        } else if (e->matches(QKeySequence::Print)) {
            print();
            break;
        } else if (e->matches(QKeySequence::SelectAll)) {
            selectAll();
            break;
        } else if (e->matches(QKeySequence::Find)) {
            find();
            break;
        } else if (e->matches(QKeySequence::FindNext)) {
            findNext();
            break;
        } else if (e->matches(QKeySequence::Replace)) {
            if (flag(ReadOnly)) {
                e->ignore();
                return;
            }
            replace();
            break;
        }

        // regular moves
        if (!bHandled) {
            if (moveKeyEvent(m_cursor, e, &leave)) {
                e->accept();

                // setFlag(CursorOn, true);
                // ensureCursorVisible();

                if (!leave)
                    for (int i = 0; !leave && (i < m_mirrors.count()); ++i)
                        moveKeyEvent(m_mirrors[i], e, &leave);

                if (leave && m_mirrors.count()) {
                    for (int i = 0; i < m_mirrors.count(); ++i) {
                        m_mirrors[i].setAutoUpdated(false);
                    }

                    clearCursorMirrors();
                    viewport()->update();
                } else {
                    repaintCursor();
                }

                bHandled = true;
            }
        }

        bool bOk = true;
        if (!bHandled) {
            int offset = 0;
            bool pke = isProcessingKeyEvent(e, &offset);
            bool prot = protectedCursor(m_cursor);

            for (auto &c : m_mirrors)
                prot |= protectedCursor(c);

            if (!pke || prot) {
                bHandled = false;
            } else {

                // clear matches to avoid offsetting and subsequent
                // remanence of matches
                if (m_definition) {
                    m_definition->clearMatches(m_doc);
                    viewport()->repaint(); // force repaint in case of crash
                }

                bool hasPH = m_placeHolders.count() && m_curPlaceHolder != -1;
                bool macroing = hasPH || m_mirrors.count();

                if (macroing)
                    m_doc->beginMacro();

                QStringList prevText;

                if (hasPH) {
                    for (int k = 0; k < m_placeHolders.count(); ++k)
                        prevText << m_placeHolders.at(k).cursor.selectedText();
                }

                bHandled = processCursor(m_cursor, e, bOk);

                if (hasPH) {
                    PlaceHolder &ph = m_placeHolders[m_curPlaceHolder];

                    QString baseText = ph.cursor.selectedText();

                    for (int phm = 0; phm < ph.mirrors.count(); ++phm) {
                        QString s = baseText;

                        if (ph.affector)
                            ph.affector->affect(prevText, m_curPlaceHolder, e,
                                                phm, s);

                        ph.mirrors[phm].replaceSelectedText(s);
                    }
                }

                if (m_mirrors.isEmpty()) {
                    // this signal is NOT emitted when cursor mirrors are
                    // used ON PURPOSE as it is the "standard" entry point
                    // for code completion, which cannot work properly with
                    // cursor mirrors (art least not always and not simply)
                    if (bHandled)
                        emit textEdited(e);

                } else {

                    for (int i = 0; bOk && (i < m_mirrors.count()); ++i)
                        processCursor(m_mirrors[i], e, bOk);
                }

                if (macroing)
                    m_doc->endMacro();
            }
        }

        if (!bHandled) {
            QAbstractScrollArea::keyPressEvent(e);
            break;
        }

        e->accept();
        emitCursorPositionChanged();
        setFlag(CursorOn, true);
        ensureCursorVisible();
        repaintCursor();

        break;
    }
}

/*!
        \internal
*/
void QEditor::inputMethodEvent(QInputMethodEvent *e) {
    if (flag(ReadOnly)) {
        e->ignore();
        return;
    }

    m_cursor.beginEditBlock();

    if (!e->commitString().isEmpty())
        m_cursor.insertText(e->commitString());

    m_cursor.endEditBlock();
}

/*!
        \internal
*/
void QEditor::mouseMoveEvent(QMouseEvent *e) {
    forever {
        if (!(e->buttons() & Qt::LeftButton))
            break;

        if (!(flag(MousePressed) || m_doubleClick.hasSelection()))
            break;

        if (flag(MaybeDrag)) {
            m_drag.stop();

#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
            if ((e->globalPosition().toPoint()
#else
            if ((e->globalPos()
#endif
                 - m_dragPoint)
                    .manhattanLength() > QApplication::startDragDistance())
                startDrag();

            // emit clearAutoCloseStack();
            break;
        }

        repaintCursor();

        const QPoint mousePos = mapToContents(e->pos());

        if (m_scroll.isActive()) {
            if (viewport()->rect().contains(e->pos()))
                m_scroll.stop();
        } else {
            if (!viewport()->rect().contains(e->pos()))
                m_scroll.start(100, this);
        }

        QDocumentCursor newCursor = cursorForPosition(mousePos);

        if (newCursor.isNull())
            break;

        if (e->modifiers() & Qt::ControlModifier) {

            // get column number for column selection
            int org = m_cursor.anchorColumnNumber();
            int dst = newCursor.columnNumber();
            // TODO : adapt to line wrapping...

            clearCursorMirrors();
            // m_cursor.clearSelection();
            int min = qMin(m_cursor.lineNumber(), newCursor.lineNumber());
            int max = qMax(m_cursor.lineNumber(), newCursor.lineNumber());

            if (min != max) {
                for (int l = min; l <= max; ++l) {
                    if (l != m_cursor.lineNumber())
                        addCursorMirror(QDocumentCursor(m_doc, l, org));
                }

                if (e->modifiers() & Qt::ShiftModifier) {
                    m_cursor.setColumnNumber(dst, QDocumentCursor::KeepAnchor);

                    for (int i = 0; i < m_mirrors.count(); ++i)
                        m_mirrors[i].setColumnNumber(
                            dst, QDocumentCursor::KeepAnchor);
                }
            } else {
                m_cursor.setSelectionBoundary(newCursor);
            }
        } else {
            m_cursor.setSelectionBoundary(newCursor);
            // setFlag(FoldedCursor, isCollapsed());
        }

        ensureCursorVisible();
        // emit clearAutoCloseStack();
        emitCursorPositionChanged();

        repaintCursor();
        break;
    }
}

/*!
        \internal
*/
void QEditor::mousePressEvent(QMouseEvent *e) {
    forever {
        if (!(e->buttons() & Qt::LeftButton))
            break;

        QPoint p = mapToContents(e->pos());

        setFlag(MousePressed, true);
        setFlag(MaybeDrag, false);

        repaintCursor();

        if (m_click.isActive() &&
            ((
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
                 e->globalPosition().toPoint()
#else
                 e->globalPos()
#endif
                 - m_clickPoint)
                 .manhattanLength() < QApplication::startDragDistance())) {
#if defined(Q_WS_MAC)
            m_cursor.select(QDocumentCursor::LineUnderCursor);
            m_doubleClick = m_cursor;
#else
            m_cursor.movePosition(1, QDocumentCursor::StartOfBlock);
            m_cursor.movePosition(1, QDocumentCursor::EndOfBlock,
                                  QDocumentCursor::KeepAnchor);
#endif

            m_click.stop();
        } else {
            QDocumentCursor cursor = cursorForPosition(p);

            if (cursor.isNull())
                break;

            if (e->modifiers() == Qt::ShiftModifier) {
                clearCursorMirrors();
                m_cursor.setSelectionBoundary(cursor);
            } else if (e->modifiers() & Qt::ControlModifier &&
                       ((e->modifiers() & Qt::ShiftModifier) ||
                        (e->modifiers() & Qt::AltModifier))) {
                // m_mirrors << cursor;
                if (e->modifiers() & Qt::ShiftModifier) {
                    // get column number for column selection
                    int org = m_cursor.anchorColumnNumber();
                    int dst = cursor.columnNumber();
                    // TODO : fix and adapt to line wrapping...

                    clearCursorMirrors();
                    // m_cursor.clearSelection();
                    int min = qMin(m_cursor.lineNumber(), cursor.lineNumber());
                    int max = qMax(m_cursor.lineNumber(), cursor.lineNumber());

                    if (min != max) {
                        for (int l = min; l <= max; ++l) {
                            if (l != m_cursor.lineNumber())
                                addCursorMirror(QDocumentCursor(m_doc, l, org));
                        }

                        if (e->modifiers() & Qt::ShiftModifier) {
                            m_cursor.setColumnNumber(
                                dst, QDocumentCursor::KeepAnchor);

                            for (int i = 0; i < m_mirrors.count(); ++i)
                                m_mirrors[i].setColumnNumber(
                                    dst, QDocumentCursor::KeepAnchor);
                        }
                    } else {
                        m_cursor.setSelectionBoundary(cursor);
                    }
                } else if ((e->modifiers() & Qt::AltModifier)) {
                    addCursorMirror(cursor);
                }
            } else {

                const QDocumentCursor &cur = m_cursor;

                if (m_cursor.hasSelection()) {
                    bool inSel = cur.isWithinSelection(cursor);

                    if (!inSel) {
                        foreach (const QDocumentCursor &m, m_mirrors) {
                            inSel = m.isWithinSelection(cursor);

                            if (inSel)
                                break;
                        }
                    }

                    if (inSel) {
                        setFlag(MaybeDrag, true);
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
                        m_dragPoint = e->globalPosition().toPoint();
#else
                        m_dragPoint = e->globalPos();
#endif
                        m_drag.start(QApplication::startDragTime(), this);

                        break;
                    }
                }

                m_doubleClick = QDocumentCursor();
                setCursor(cursor);
                break;
            }
        }

        ensureCursorVisible();
        // emit clearAutoCloseStack();
        emitCursorPositionChanged();
        repaintCursor();

        break;
    }
}

/*!
        \internal
*/
void QEditor::mouseReleaseEvent(QMouseEvent *e) {
    m_scroll.stop();

    repaintCursor();

    if (flag(MaybeDrag)) {
        setFlag(MousePressed, false);
        setCursorPosition(mapToContents(e->pos()));

        m_cursor.clearSelection();
    }

    if (flag(MousePressed)) {
        setFlag(MousePressed, false);

        setClipboardSelection();
    } else if (e->button() == Qt::MiddleButton &&
               QApplication::clipboard()->supportsSelection()) {
        setCursorPosition(mapToContents(e->pos()));
        // setCursorPosition(viewport()->mapFromGlobal(e->globalPos()));

        const QMimeData *md =
            QApplication::clipboard()->mimeData(QClipboard::Selection);

        if (md)
            insertFromMimeData(md);
    }

    repaintCursor();

    if (m_drag.isActive())
        m_drag.stop();
}

/*!
        \internal
*/
void QEditor::mouseDoubleClickEvent(QMouseEvent *e) {
    forever {
        if (e->button() != Qt::LeftButton) {
            e->ignore();
            break;
        }

        setFlag(MaybeDrag, false);

        repaintCursor();

        clearCursorMirrors();
        setCursorPosition(mapToContents(e->pos()));

        // setFlag(FoldedCursor, isCollapsed());

        if (m_cursor.isValid()) {
            m_cursor.select(QDocumentCursor::WordUnderCursor);

            setClipboardSelection();
            // emit clearAutoCloseStack();
            emitCursorPositionChanged();

            repaintCursor();

            viewport()->repaint();
        } else {
            // qDebug("invalid cursor");
        }

        m_doubleClick = m_cursor;

#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
        m_clickPoint = e->globalPosition().toPoint();
#else
        m_clickPoint = e->globalPos();
#endif

        m_click.start(qApp->doubleClickInterval(), this);
        break;
    }
}

/*!
        \internal
*/
void QEditor::dragEnterEvent(QDragEnterEvent *e) {
    if (flag(ReadOnly)) {
        return;
    }

    if (e && e->mimeData() &&
        (e->mimeData()->hasFormat("text/plain") ||
         e->mimeData()->hasFormat("text/html")) &&
        !e->mimeData()->hasFormat("text/uri-list"))
        e->acceptProposedAction();
    else
        return;

    m_dragAndDrop = QDocumentCursor();
}

/*!
        \internal
*/
void QEditor::dragLeaveEvent(QDragLeaveEvent *) {
    const QRect crect = cursorRect(m_dragAndDrop);
    m_dragAndDrop = QDocumentCursor();

    if (crect.isValid())
        viewport()->update(crect);
}

/*!
        \internal
*/
void QEditor::dragMoveEvent(QDragMoveEvent *e) {
    if (flag(ReadOnly)) {
        return;
    }

    if (e && e->mimeData() &&
        (e->mimeData()->hasFormat("text/plain") ||
         e->mimeData()->hasFormat("text/html")) &&
        !e->mimeData()->hasFormat("text/uri-list"))
        e->acceptProposedAction();
    else
        return;

#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
    QDocumentCursor c =
        cursorForPosition(mapToContents(e->position().toPoint()));
#else
    QDocumentCursor c = cursorForPosition(mapToContents(e->pos()));
#endif
    if (c.isValid()) {
        QRect crect = cursorRect(m_dragAndDrop);

        if (crect.isValid())
            viewport()->update(crect);

        m_dragAndDrop = c;

        crect = cursorRect(m_dragAndDrop);
        viewport()->update(crect);
    }

    // e->acceptProposedAction();
}

/*!
        \internal
*/
void QEditor::dropEvent(QDropEvent *e) {
    if (flag(ReadOnly)) {
        return;
    }

    m_dragAndDrop = QDocumentCursor();

#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
    QDocumentCursor c =
        cursorForPosition(mapToContents(e->position().toPoint()));
#else
    QDocumentCursor c = cursorForPosition(mapToContents(e->pos()));
#endif
    if ((e->source() == this) && (m_cursor.isWithinSelection(c)))
        return;

    if (e && e->mimeData() &&
        (e->mimeData()->hasFormat("text/plain") ||
         e->mimeData()->hasFormat("text/html")) &&
        !e->mimeData()->hasFormat("text/uri-list") && !flag(FoldedCursor)) {
        e->acceptProposedAction();
    } else {
        return;
    }

    // repaintSelection();

    m_doc->beginMacro();
    // m_cursor.beginEditBlock();

    if ((e->dropAction() == Qt::MoveAction) &&
        ((e->source() == this) || (e->source() == viewport()))) {
        m_cursor.removeSelectedText();

        for (int i = 0; i < m_mirrors.count(); ++i)
            m_mirrors[i].removeSelectedText();

    } else {
        // qDebug("action : %i", e->dropAction());
        m_cursor.clearSelection();
    }

    clearCursorMirrors();
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
    m_cursor.moveTo(cursorForPosition(mapToContents(e->position().toPoint())));
#else
    m_cursor.moveTo(cursorForPosition(mapToContents(e->pos())));
#endif

    insertFromMimeData(e->mimeData());
    // m_cursor.endEditBlock();

    m_doc->endMacro();
}

/*!
        \internal
*/
void QEditor::changeEvent(QEvent *e) {
    QAbstractScrollArea::changeEvent(e);

    if (e->type() == QEvent::ApplicationFontChange ||
        e->type() == QEvent::FontChange) {
        if (!m_doc)
            return;

        m_doc->setFont(font());
        // setTabStop(iTab);

    } else if (e->type() == QEvent::ActivationChange) {
        if (!isActiveWindow())
            m_scroll.stop();
    }
}

/*!
        \internal
*/
void QEditor::showEvent(QShowEvent *e) {
    QCodeEdit *ce = QCodeEdit::manager(this);

    if (ce)
        ce->panelLayout()->update();

    QAbstractScrollArea::showEvent(e);

    if (flag(LineWrap)) {
        m_doc->setWidthConstraint(wrapWidth());
    }

    if (flag(EnsureVisible))
        ensureCursorVisible();
}

/*!
        \internal
        \brief Zoom in/out upon ctrl+wheel
*/
void QEditor::wheelEvent(QWheelEvent *e) {
    if (e->modifiers() & Qt::ControlModifier) {
        auto dela = e->angleDelta().y() / 1200.0 / 2;
        setScaleRate(scaleRate() + dela);

        // viewport()->update();

        return;
    }

    QAbstractScrollArea::wheelEvent(e);
    updateMicroFocus();
    // viewport()->update();
}

/*!
        \internal
*/
void QEditor::resizeEvent(QResizeEvent *) {
    const QSize viewportSize = viewport()->size();

    if (flag(LineWrap)) {
        // qDebug("resize t (2) : wrapping to %i", viewport()->width());

        m_doc->setWidthConstraint(wrapWidth());
    } else {
        horizontalScrollBar()->setMaximum(
            qMax(0, m_doc->width() - viewportSize.width()));
        horizontalScrollBar()->setPageStep(viewportSize.width());
    }

    const int ls = m_doc->fontMetrics().lineSpacing();
    verticalScrollBar()->setMaximum(
        qMax(0, 1 + (m_doc->height() - viewportSize.height()) / ls));
    verticalScrollBar()->setPageStep(viewportSize.height() / ls);

    // qDebug("page step : %i", viewportSize.height() / ls);

    // if ( isCursorVisible() && flag(LineWrap) )
    //	ensureCursorVisible();
}

/*!
        \internal
*/
void QEditor::focusInEvent(QFocusEvent *e) {
    setFlag(CursorOn, true);
    m_blink.start(QApplication::cursorFlashTime() / 2, this);
    // ensureCursorVisible();

    QAbstractScrollArea::focusInEvent(e);
}

/*!
        \internal
*/
void QEditor::focusOutEvent(QFocusEvent *e) {
    setFlag(CursorOn, false);
    m_blink.stop();

    QAbstractScrollArea::focusOutEvent(e);
}

/*!
        \brief Context menu event

        All the (managed) actions added to the editor are showed in it by
   default.
*/
void QEditor::contextMenuEvent(QContextMenuEvent *e) {
    if (!pMenu) {
        e->ignore();
        return;
    }

    e->accept();

    pMenu->exec(e->globalPos());
}

/*!
        \return Whether the document has been modified.
*/
bool QEditor::isContentModified() const {
    return m_doc ? !m_doc->isClean() : false;
}

/*!
        \brief Notify that the content is clean (modifications undone or
   document saved)

        \note Don't mess with this. The document knows better.
*/
void QEditor::setContentClean(bool y) { setContentModified(!y); }

/*!
        \brief Notify that the content has been modified

        \note Don't mess with this. The document knows better.
*/
void QEditor::setContentModified(bool y) {
    setWindowModified(y);
    emit contentModified(y);
}

/*!
        \brief Changes the file name

        This method does not affect files on disk (no save/load/move occurs)
*/
void QEditor::setFileName(const QString &f) {
    QString prev = fileName();

    if (f == prev)
        return;

    /*
    QStringList l = m_watcher->files();

    if ( l.count() )
            m_watcher->removePaths(l);
    */

    watcher()->removeWatch(QString(), this);

    m_fileName = f;
    m_name = QFileInfo(f).fileName();

    // if ( fileName().count() )
    //	m_watcher->addPath(fileName());

    if (fileName().size())
        watcher()->addWatch(fileName(), this);

    setTitle(name().size() ? name() : tr("untitled"));
}

/*!
        \brief Set the title of the widget

        Take care of adding a "[*]" prefix so that document changes are
   visible on title bars.
*/
void QEditor::setTitle(const QString &title) {
    QString s(title);

    if (!s.contains("[*]"))
        s.prepend("[*]");

    setWindowTitle(s);
    emit titleChanged(title);
}

/*!
        \return The name of the file being edited (without its path)
*/
QString QEditor::name() const { return m_name; }

/*!
        \return The full filename of the file being edited
*/
QString QEditor::fileName() const { return m_fileName; }

/*!
        \brief Prevent tab key press to be considered as widget navigation
*/
bool QEditor::focusNextPrevChild(bool) {
    // make sure we catch tabs :)

    return false;
}

/*!
        \brief Start a drag and drop operation using the current selection
*/
void QEditor::startDrag() {
    setFlag(MousePressed, false);
    QMimeData *data = createMimeDataFromSelection();

    QDrag *drag = new QDrag(this);
    drag->setMimeData(data);

    Qt::DropActions actions = Qt::CopyAction | Qt::MoveAction;
    Qt::DropAction action = drag->exec(actions);

    if ((action == Qt::MoveAction) && (drag->target() != this)) {
        m_cursor.removeSelectedText();

        for (int i = 0; i < m_mirrors.count(); ++i)
            m_mirrors[i].removeSelectedText();
    }
}

/*!
        \brief Handle cursor movements upon key event
*/
bool QEditor::moveKeyEvent(QDocumentCursor &cursor, QKeyEvent *e, bool *leave) {
    QDocumentCursor::MoveMode mode = e->modifiers() & Qt::ShiftModifier
                                         ? QDocumentCursor::KeepAnchor
                                         : QDocumentCursor::MoveAnchor;

    if (flag(LineWrap) && flag(CursorJumpPastWrap))
        mode |= QDocumentCursor::ThroughWrap;

    QDocumentCursor::MoveOperation op = QDocumentCursor::NoMove;
#ifdef Q_WS_MAC
    // There can be only one modifier (+ shift), but we also need to make
    // sure that we have a "move key" pressed before we reject it.
    bool twoModifiers =
        ((e->modifiers() & (Qt::ControlModifier | Qt::AltModifier)) ==
         (Qt::ControlModifier | Qt::AltModifier)) ||
        ((e->modifiers() & (Qt::ControlModifier | Qt::MetaModifier)) ==
         (Qt::ControlModifier | Qt::MetaModifier)) ||
        ((e->modifiers() & (Qt::AltModifier | Qt::MetaModifier)) ==
         (Qt::AltModifier | Qt::MetaModifier));
#else
    if (e->modifiers() &
        (Qt::AltModifier | Qt::MetaModifier | Qt::KeypadModifier)) {
        e->ignore();
        if (leave)
            *leave = false;
        return false;
    }
#endif

    switch (e->key()) {
#ifndef Q_WS_MAC // Use the default Windows bindings.
    case Qt::Key_Up:
        op = QDocumentCursor::Up;
        break;
    case Qt::Key_Down:
        op = QDocumentCursor::Down;
        /*
        if (mode == QDocumentCursor::KeepAnchor) {
            QTextBlock block = cursor.block();
            QTextLine line = currentTextLine(cursor);
            if (!block.next().isValid()
                && line.isValid()
                && line.lineNumber() == block.layout()->lineCount() - 1)
                op = QDocumentCursor::End;
        }
        */
        break;
    case Qt::Key_Left:
        op = e->modifiers() & Qt::ControlModifier ? QDocumentCursor::WordLeft
                                                  : QDocumentCursor::Left;
        break;
    case Qt::Key_Right:
        op = e->modifiers() & Qt::ControlModifier ? QDocumentCursor::WordRight
                                                  : QDocumentCursor::Right;
        break;
    case Qt::Key_Home:
        op = e->modifiers() & Qt::ControlModifier
                 ? QDocumentCursor::Start
                 : QDocumentCursor::StartOfLine;
        break;
    case Qt::Key_End:
        op = e->modifiers() & Qt::ControlModifier ? QDocumentCursor::End
                                                  : QDocumentCursor::EndOfLine;
        break;
#else
        /*
                Except for pageup and pagedown, Mac OS X has very different
           behavior, we don't do it all, but here's the breakdown:

                Shift still works as an anchor, but only one of the other
           keys can be dow Ctrl (Command), Alt (Option), or Meta (Control).

                Command/Control + Left/Right -- Move to left or right of the
           line
                                                + Up/Down -- Move to top
           bottom of the file. (Control doesn't move the cursor)

                Option	+ Left/Right -- Move one word Left/right.
                                + Up/Down  -- Begin/End of Paragraph.

                Home/End Top/Bottom of file. (usually don't move the cursor,
           but will select)
        */
    case Qt::Key_Up:
        if (twoModifiers) {
            QApplication::beep();
            if (leave)
                *leave = false;
            return true;
        } else {
            if (e->modifiers() & (Qt::ControlModifier | Qt::MetaModifier))
                op = QDocumentCursor::Start;
            else if (e->modifiers() & Qt::AltModifier)
                op = QDocumentCursor::StartOfBlock;
            else
                op = QDocumentCursor::Up;
        }
        break;
    case Qt::Key_Down:
        if (twoModifiers) {
            QApplication::beep();
            if (leave)
                *leave = false;
            return true;
        } else {
            if (e->modifiers() & (Qt::ControlModifier | Qt::MetaModifier)) {
                op = QDocumentCursor::End;
            } else if (e->modifiers() & Qt::AltModifier) {
                op = QDocumentCursor::EndOfBlock;
            } else {
                op = QDocumentCursor::Down;
                /*
                if (mode == QDocumentCursor::KeepAnchor) {
                    QTextBlock block = cursor.block();
                    QTextLine line = currentTextLine(cursor);
                    if (!block.next().isValid()
                        && line.isValid()
                        && line.lineNumber() ==
                            block.layout()->lineCount() - 1)
                        op = QDocumentCursor::End;
                }
                */
            }
        }
        break;
    case Qt::Key_Left:
        if (twoModifiers) {
            QApplication::beep();
            if (leave)
                *leave = false;
            return true;
        } else {
            if (e->modifiers() & (Qt::ControlModifier | Qt::MetaModifier))
                op = QDocumentCursor::StartOfLine;
            else if (e->modifiers() & Qt::AltModifier)
                op = QDocumentCursor::WordLeft;
            else
                op = QDocumentCursor::Left;
        }
        break;
    case Qt::Key_Right:
        if (twoModifiers) {
            QApplication::beep();
            if (leave)
                *leave = false;
            return true;
        } else {
            if (e->modifiers() & (Qt::ControlModifier | Qt::MetaModifier))
                op = QDocumentCursor::EndOfLine;
            else if (e->modifiers() & Qt::AltModifier)
                op = QDocumentCursor::WordRight;
            else
                op = QDocumentCursor::Right;
        }
        break;
    case Qt::Key_Home:
        if (e->modifiers() &
            (Qt::ControlModifier | Qt::MetaModifier | Qt::AltModifier)) {
            QApplication::beep();
            if (leave)
                *leave = false;
            return true;
        } else {
            op = QDocumentCursor::Start;
        }
        break;
    case Qt::Key_End:
        if (e->modifiers() &
            (Qt::ControlModifier | Qt::MetaModifier | Qt::AltModifier)) {
            QApplication::beep();
            if (leave)
                *leave = false;
            return true;
        } else {
            op = QDocumentCursor::End;
        }
        break;
#endif
    case Qt::Key_PageDown:
        if (leave)
            *leave = true;
        pageDown(mode);
        return true;

    case Qt::Key_PageUp:
        if (leave)
            *leave = true;
        pageUp(mode);
        return true;

    case Qt::Key_Insert:
        if (!e->modifiers()) {
            if (leave)
                *leave = false;
            setFlag(Overwrite, !flag(Overwrite));

            // hack to make sure status panel gets updated...
            // TODO : emit signals on flag change?
            emitCursorPositionChanged();
            return false;
        }

    default:
        return false;
    }

    int prev = cursor.lineNumber();

    // const bool moved =
    cursor.movePosition(1, op, mode);

    if (prev != cursor.lineNumber()) {
        if (m_curPlaceHolder >= 0 &&
            m_curPlaceHolder < m_placeHolders.count()) {
            // allow mirror movement out of line while in placeholder
            PlaceHolder &ph = m_placeHolders[m_curPlaceHolder];
            if (ph.cursor.isWithinSelection(cursor))
                return true;
            for (int i = 0; i < ph.mirrors.count(); ++i)
                if (ph.mirrors.at(i).isWithinSelection(cursor))
                    return true;
        }
        // moved = true;
        if (leave)
            *leave = true;
        m_curPlaceHolder = -1;
    }

    return true;
}

/*!
        \brief Go up by one page

        \note This method clears all cursor mirrors and suspend placeholder
   edition.
*/
void QEditor::pageUp(QDocumentCursor::MoveMode moveMode) {
    clearCursorMirrors();
    m_curPlaceHolder = -1;

    if (m_cursor.atStart())
        return;

    int n = viewport()->height() / m_doc->fontMetrics().lineSpacing();

    repaintCursor();
    m_cursor.movePosition(n, QDocumentCursor::Up, moveMode);

    ensureCursorVisible();
    emitCursorPositionChanged();
    // updateMicroFocus();
}

/*!
        \brief Go down by one page

        \note This method clears all cursor mirrors.
*/
void QEditor::pageDown(QDocumentCursor::MoveMode moveMode) {
    clearCursorMirrors();
    m_curPlaceHolder = -1;

    if (m_cursor.atEnd())
        return;

    int n = viewport()->height() / m_doc->fontMetrics().lineSpacing();

    repaintCursor();
    m_cursor.movePosition(n, QDocumentCursor::Down, moveMode);

    ensureCursorVisible();
    emitCursorPositionChanged();
}

/*!
        \brief Determine whether a given key event is an editing operation
*/
bool QEditor::isProcessingKeyEvent(QKeyEvent *e, int *offset) {
    if (flag(FoldedCursor))
        return false;

    switch (e->key()) {
    case Qt::Key_Backspace:
        //--*offset;
        break;

    case Qt::Key_Delete:
        //--*offset;
        break;

    case Qt::Key_Enter:
    case Qt::Key_Return:
        if (offset)
            ++*offset;
        break;

    default: {
        QString text = e->text();

        if (text.isEmpty() || !(text.at(0).isPrint() || (text.at(0) == '\t')))
            return false;

        // if ( offset )
        //	*offset += text.length();

        break;
    }
    }

    return true;
}

/*!
        \internal
        \brief Process a key event for a given cursor

        This method only take care of editing operations, not movements.
*/
bool QEditor::processCursor(QDocumentCursor &c, QKeyEvent *e, bool &b) {
    if (!b)
        return false;

    if (flag(ReadOnly)) {
        return false;
    }

    bool hasSelection = c.hasSelection();

    switch (e->key()) {
    case Qt::Key_Backspace:
        if (flag(FoldedCursor))
            return false;

        if (hasSelection) {
            c.removeSelectedText();
        } else {
            c.deletePreviousChar();
        }

        break;

    case Qt::Key_Delete:
        if (flag(FoldedCursor))
            return false;

        if (hasSelection)

            c.removeSelectedText();
        else
            c.deleteChar();

        // emit clearAutoCloseStack();
        break;

    case Qt::Key_Enter:
    case Qt::Key_Return: {
        if (flag(FoldedCursor))
            return false;

        c.beginEditBlock();

        if (hasSelection)
            c.removeSelectedText();
        else if (flag(Overwrite))
            c.deleteChar();

        QString indent;

        if (flag(AutoIndent) && (m_curPlaceHolder == -1)) {
            if (m_definition) {
                indent = m_definition->indent(c);
            } else {
                // default : keep leading ws from previous line...
                QDocumentLine l = c.line();
                const int idx = qMin(l.firstChar(), c.columnNumber());

                indent = l.text();

                if (idx != -1)
                    indent.resize(idx);
            }
        }

        if (indent.size()) {
            indent.prepend("\n");
            c.insertText(indent);
        } else {
            c.insertLine();
        }

        c.endEditBlock();

        break;
    }

    default: {
        QString text = e->text();

        if (text.isEmpty() || !(text.at(0).isPrint() || (text.at(0) == '\t'))) {
            b = false;
            return false;
        }

        if (flag(ReplaceTabs)) {
            text.replace("\t", QString(m_doc->tabStop(), ' '));
        }

        if (flag(AutoCloseChars)) {
            // auto close: {} [] () "" ''
            if (isAutoCloseChar(text)) {
                QString content =
                    text + m_cursor.selectedText() + getPairedCloseChar(text);
                c.replaceSelectedText(content);
                c.clearSelection();
                c.movePosition(-1);
            } else {
                if (text == QStringLiteral("\"") ||
                    text == QStringLiteral("'")) {
                    if (c.selectionStart().lineNumber() ==
                        c.selectionEnd().lineNumber()) {
                        if (c.hasSelection()) {
                            QString content =
                                text + m_cursor.selectedText() + text;
                            c.replaceSelectedText(content);
                            c.clearSelection();
                        } else {
                            auto ch = c.nextChar();
                            if (ch == QChar('"') || ch == QChar('\'')) {
                                if (c.previousChar() == QChar('\\')) {
                                    c.beginEditBlock();
                                    insertText(c, text);
                                    c.endEditBlock();
                                } else {
                                    c.movePosition(1);
                                }
                            } else {
                                c.beginEditBlock();
                                insertText(c, text + text);
                                c.endEditBlock();
                                c.movePosition(-1);
                            }
                        }
                    }
                } else {
                    if (isPairedCloseChar(text)) {
                        if (c.previousChar() == getPairedBeginChar(text)) {
                            c.movePosition(1);
                            break;
                        }
                    }

                    c.beginEditBlock();
                    insertText(c, text);
                    c.endEditBlock();
                }
            }
        } else {
            c.beginEditBlock();
            insertText(c, text);
            c.endEditBlock();
        }

        break;
    }
    }

    return true;
}

void QEditor::preInsert(QDocumentCursor &c, const QString &s) {
    if (flag(AutoIndent) && (m_curPlaceHolder == -1) && c.columnNumber() &&
        m_definition && m_definition->unindent(c, s)) {
        int firstNS = 0;
        QString txt = c.line().text();

        while ((firstNS < txt.length()) && txt.at(firstNS).isSpace())
            ++firstNS;

        if (!firstNS)
            return;

        const int off = c.columnNumber() - firstNS;

        if (off > 0)
            c.movePosition(off, QDocumentCursor::PreviousCharacter);

        /*
                It might be possible to improve that part to have a more
           natural/smarter unindenting by trying to guess the scheme used by
           the user...
        */

        if (txt.at(firstNS - 1) == '\t') {
            c.movePosition(1, QDocumentCursor::Left,
                           QDocumentCursor::KeepAnchor);
        } else {
            const int ts = m_doc->tabStop();

            do {
                --firstNS;
                c.movePosition(1, QDocumentCursor::Left,
                               QDocumentCursor::KeepAnchor);
            } while (QDocument::screenLength(txt.constData(), firstNS, ts) %
                     ts);
        }

        c.removeSelectedText();

        if (off > 0)
            c.movePosition(off, QDocumentCursor::NextCharacter);
    }
}

/*!
        \brief Insert some text at a given cursor position

        This function is provided to keep indenting/outdenting working when
   editing
*/
void QEditor::insertText(QDocumentCursor &c, const QString &text,
                         const QString &sfmtID) {
    if (protectedCursor(c))
        return;

    bool hasSelection = c.hasSelection();

    if (hasSelection)
        c.removeSelectedText();

    if (!hasSelection && flag(Overwrite))
        c.deleteChar();

    QStringList lines = text.split('\n', Qt::KeepEmptyParts);

    if ((lines.count() == 1) || !flag(AdjustIndent)) {
        preInsert(c, lines.first());

        // if (flag(ReplaceTabs)) {
        //     // replace tabs by spaces properly
        // }

        c.insertText(text, false, sfmtID);
    } else {

        preInsert(c, lines.first());
        c.insertText(lines.takeFirst(), false, sfmtID);

        QString indent;
        // FIXME ? work on strings to make sure command grouping does not
        // interfere with cursor state...

        indent = c.line().text().left(
            qMax(0, qMin(c.line().firstChar(), c.columnNumber())));

        foreach (QString l, lines) {
            int n = 0;

            while (n < l.size() && l.at(n).isSpace())
                ++n;

            l.remove(0, n);

            if (m_definition) {
                // FIXME ? work on strings to make sure command grouping
                // does not interfere with cursor state...
                indent = m_definition->indent(c);

                if (flag(ReplaceTabs))
                    indent.replace("\t", QString(m_doc->tabStop(), ' '));
            }

            c.insertLine();
            c.insertText(indent, false, sfmtID);

            preInsert(c, l);

            c.insertText(l, false, sfmtID);
        }
    }
}

/*!
        \brief Write some text at the current cursor position

        This function is provided to make editing operations easier
        from the outside and to keep them compatible with cursor
        mirrors.
*/
void QEditor::write(const QString &s, const QString &sfmtID) {
    m_doc->beginMacro();

    insertText(m_cursor, s, sfmtID);

    for (int i = 0; i < m_mirrors.count(); ++i)
        insertText(m_mirrors[i], s, sfmtID);

    m_doc->endMacro();

    emitCursorPositionChanged();
    setFlag(CursorOn, true);
    ensureCursorVisible();
    repaintCursor();
}

/*!
        \brief Obtain the value of panel margins
        \param l left margin
        \param t top margin
        \param r right margin
        \param b bottom margin
*/
void QEditor::getPanelMargins(int *l, int *t, int *r, int *b) const {
    m_margins.getCoords(l, t, r, b);
}

/*!
        \brief Change the viewport margins to make room for panels
        \param l left margin
        \param t top margin
        \param r right margin
        \param b bottom margin
*/
void QEditor::setPanelMargins(int l, int t, int r, int b) {
    m_margins.setCoords(l, t, r, b);

    setViewportMargins(l, t, r, b);

    if (flag(LineWrap)) {
        // qDebug("panel adjust : wrapping to %i", viewport()->width());
        m_doc->setWidthConstraint(wrapWidth());
    }
}

/*!
        \brief Request repaint (using QWidget::update()) for the region
   occupied by the cursor
*/
void QEditor::repaintCursor() {
    if (m_mirrors.count())
        viewport()->update();

    QRect r = QEditor::cursorRect().adjusted(0, -1, 0, 1);

    if (m_crect != r) {
        viewport()->update(m_crect.translated(horizontalOffset(), 0));
        m_crect = r;
        viewport()->update(m_crect.translated(horizontalOffset(), 0));
    } else {
        viewport()->update(m_crect.translated(horizontalOffset(), 0));
    }
}

/*!
        \return whether the cursor is currently visible
*/
bool QEditor::isCursorVisible() const {
    QPoint pos = m_cursor.documentPosition();

    // const QRect cursor(pos.x(), pos.y(), 1,
    //                    QDocument::fontMetrics().lineSpacing());
    const QRect display(horizontalOffset(), verticalOffset(),
                        viewport()->width(), viewport()->height());

    // qDebug() << pos << " belongs to " << display << " ?";

    return display.contains(pos); // cursor);
}

/*!
        \brief Ensure that the current cursor is visible
*/
void QEditor::ensureCursorVisible() {
    if (!isVisible()) {
        setFlag(EnsureVisible, true);
        return;
    }

    QPoint pos = m_cursor.documentPosition();

    const int ls = m_doc->fontMetrics().lineSpacing();

    int ypos = pos.y(), yval = verticalOffset(), ylen = viewport()->height(),
        yend = ypos + ls;

    if (ypos < yval)
        verticalScrollBar()->setValue(ypos / ls);
    else if (yend > (yval + ylen))
        verticalScrollBar()->setValue(1 + (yend - ylen) / ls);

    int xval = horizontalOffset(), xlen = viewport()->width(), xpos = pos.x();

    if (xpos < xval) {
        // qDebug("scroll leftward");
        horizontalScrollBar()->setValue(qMax(0, xpos - 4));
    } else if (xpos > (xval + xlen - 4)) {
        // qDebug("scroll rightward : %i", xpos - xlen + 4);
        horizontalScrollBar()->setValue(
            qMax(horizontalScrollBar()->value(), xpos - xlen + 4));
    }

    setFlag(EnsureVisible, false);
}

/*!
        \brief ensure that a given line is visible by updating scrollbars if
   needed
*/
void QEditor::ensureVisible(int line) {
    if (!m_doc)
        return;

    const int ls = m_doc->fontMetrics().lineSpacing();
    int ypos = m_doc->y(line), yval = verticalOffset(),
        ylen = viewport()->height(), yend = ypos + ls;

    if (ypos < yval)
        verticalScrollBar()->setValue(ypos / ls);
    else if (yend > (yval + ylen))
        verticalScrollBar()->setValue(1 + (yend - ylen) / ls);
}

/*!
        \brief Ensure that a given rect is visible by updating scrollbars if
   needed
*/
void QEditor::ensureVisible(const QRect &rect) {
    if (!m_doc)
        return;

    const int ls = m_doc->fontMetrics().lineSpacing();
    int ypos = rect.y(), yval = verticalOffset(), ylen = viewport()->height(),
        yend = ypos + rect.height();

    if (ypos < yval)
        verticalScrollBar()->setValue(ypos / ls);
    else if (yend > (yval + ylen))
        verticalScrollBar()->setValue(1 + (yend - ylen) / ls);

    // verticalScrollBar()->setValue(rect.y());
}

/*!
        \return the rectangle occupied by the current cursor

        This will either return a cursorRect for the current cursor or
        the selectionRect() if the cursor has a selection.

        The cursor position, which would be the top left corner of the
   actual rectangle occupied by the cursor can be obtained using
   QDocumentCursor::documentPosition()

        The behavior of this method may surprise newcomers but it is
   actually quite sensible as this rectangle is mainly used to specify the
   update rect of the widget and the whole line needs to be updated to
   properly update the line background whenever the cursor move from a line
   to another.
*/
QRect QEditor::cursorRect() const {
    return m_cursor.hasSelection() ? selectionRect()
                                   : QEditor::cursorRect(m_cursor);
}

/*!
        \return the rectangle occupied by the selection in viewport
   coordinates

        If the current cursor does not have a selection, its cursorRect() is
   returned.

        The returned rectangle will always be bigger than the actual
   selection has it is actually the union of all the rectangles occupied by
   all lines the selection spans over.
*/
QRect QEditor::selectionRect() const {
    if (!m_cursor.hasSelection())
        return QEditor::cursorRect(m_cursor);

    QDocumentSelection s = m_cursor.selection();

    if (s.startLine == s.endLine)
        return QEditor::cursorRect(m_cursor);

    Q_ASSERT(m_doc);
    int y = m_doc->y(s.startLine);
    QRect r = m_doc->lineRect(s.endLine);
    int height = r.y() + r.height() - y;

    r = QRect(0, y, viewport()->width(), height);
    r.translate(-horizontalOffset(), -verticalOffset());
    return r;
}

/*!
        \return the rectangle occupied by the given line, in viewport
   coordinates

        The width of the returned rectangle will always be the viewport
   width.
*/
QRect QEditor::lineRect(int line) const {
    if (!m_doc)
        return QRect();

    QRect r = m_doc->lineRect(line);
    r.setWidth(viewport()->width());
    r.translate(-horizontalOffset(), -verticalOffset());

    return r;
}

/*!
        \overload

        \note This function relies on QDocumentLine::lineNumber() so avoid
        it whenever possible as it is much slower than providing a line
   number directly.
*/
QRect QEditor::lineRect(const QDocumentLine &l) const {
    // qFatal("bad practice...");

    if (!m_doc)
        return QRect();

    QRect r = m_doc->lineRect(l);
    r.setWidth(viewport()->width());
    r.translate(-horizontalOffset(), -verticalOffset());

    return r;
}

/*!
        \return The line rect of the given cursor
*/
QRect QEditor::cursorRect(const QDocumentCursor &c) const {
    return QEditor::lineRect(c.lineNumber());
}

/*!
        \brief creates a valid QMimeData object depending on the selection
*/
QMimeData *QEditor::createMimeDataFromSelection() const {
    QMimeData *d = new QMimeData;

    if (!m_cursor.hasSelection()) {
        qWarning("Generated empty MIME data");
        return d;
    }

    if (m_mirrors.isEmpty()) {
        d->setText(m_cursor.selectedText());
    } else {
        QString serialized = m_cursor.selectedText();

        foreach (const QDocumentCursor &m, m_mirrors) {
            serialized += '\n';
            serialized += m.selectedText();
        }

        d->setText(serialized);
        d->setData("text/column-selection", serialized.toLocal8Bit());
    }

    // qDebug("generated selection from : \"%s\"", qPrintable(d->text()));

    return d;
}

static void fixLineEndings(QString &text) {
    // deal with Dos first to avoid line endings duplication
    text.replace("\r\n", "\n");

    text.replace('\r', '\n');
}

/*!
        \brief Inserts the content of a QMimeData object at the cursor
   position

        \note Only plain text is supported... \see QMimeData::hasText()
*/
void QEditor::insertFromMimeData(const QMimeData *d) {
    bool s = m_cursor.hasSelection();

    if (!d)
        return;

    if (d->hasFormat("text/uri-list")) {

        return;
    }

    if (m_cursor.isValid()) {
        if (d->hasFormat("text/column-selection")) {
            clearCursorMirrors();

            QStringList columns =
                QString::fromLocal8Bit(d->data("text/column-selection"))
                    .split('\n');

            m_doc->beginMacro();

            if (s)
                m_cursor.removeSelectedText();

            int col = m_cursor.columnNumber();
            // m_cursor.insertText(columns.takeFirst());
            insertText(m_cursor, columns.takeFirst());
            QDocumentCursor c = m_cursor;

            while (columns.count()) {
                // check for end of doc and add line if needed...
                c.setColumnNumber(c.line().length());

                if (c.atEnd())
                    c.insertText("\n");
                else
                    c.movePosition(1, QDocumentCursor::NextCharacter);

                // align
                c.setColumnNumber(qMin(col, c.line().length()));

                // copy content of clipboard
                // c.insertText(columns.takeFirst());
                insertText(c, columns.takeFirst());
                addCursorMirror(c);
            }

            m_doc->endMacro();

        } else {
            m_doc->beginMacro();

            // if ( s )
            //{
            //	m_cursor.removeSelectedText();
            // }

            QString txt;

            if (d->hasFormat("text/plain"))
                txt = d->text();
            else if (d->hasFormat("text/html"))
                txt = d->html();

            fixLineEndings(txt);

            insertText(m_cursor, txt);

            for (int i = 0; i < m_mirrors.count(); ++i) {
                insertText(m_mirrors[i], txt);
            }

            m_doc->endMacro();
        }

        ensureCursorVisible();
        setFlag(CursorOn, true);

        emitCursorPositionChanged();
    }
}

/*!
        \brief Removes all cursor mirrors
*/
void QEditor::clearCursorMirrors() {
    if (m_mirrors.isEmpty())
        return;

    m_curPlaceHolder = -1;
    repaintCursor();

    for (int i = 0; i < m_mirrors.count(); ++i) {
        m_mirrors[i].setAutoUpdated(false);
    }

    m_mirrors.clear();

    viewport()->update();
}

/*!
        \brief Add a cursor mirror
*/
void QEditor::addCursorMirror(const QDocumentCursor &c) {
    if (!m_cursorMirrorEnabled || c.isNull() || (c == m_cursor) ||
        m_mirrors.contains(c))
        return;

    m_mirrors << c;

    // necessary for smooth mirroring
    m_mirrors.last().setSilent(true);
    m_mirrors.last().setAutoUpdated(true);
}

bool QEditor::undoRedoEnabled() const { return m_undoRedoEnabled; }

bool QEditor::cursorMirrorEnabled() const { return m_cursorMirrorEnabled; }

bool QEditor::unindent(const QDocumentCursor &cur) {
    QDocumentLine beg(cur.line());
    int r = 0, n = 0, t = m_doc->tabStop();
    QString txt = beg.text().left(beg.firstChar());

    while (txt.size() && (n < t)) {
        if (txt.at(txt.length() - 1) == '\t')
            n += t - (n % t);
        else
            ++n;

        ++r;
        txt.chop(1);
    }

    if (!r)
        return false;

    QDocumentCursor c(cur);
    c.setSilent(true);
    c.movePosition(1, QDocumentCursor::StartOfBlock,
                   QDocumentCursor::MoveAnchor);
    c.movePosition(r, QDocumentCursor::Right, QDocumentCursor::KeepAnchor);
    c.removeSelectedText();

    return true;
}

bool QEditor::isAutoCloseChar(const QString &ch) {
    // auto close: {} [] ()
    return ch == QStringLiteral("{") || ch == QStringLiteral("[") ||
           ch == QStringLiteral("(");
}

bool QEditor::isPairedCloseChar(const QString &ch) {
    // auto close: {} [] ()
    return ch == QStringLiteral("}") || ch == QStringLiteral("]") ||
           ch == QStringLiteral(")");
}

QString QEditor::getPairedBeginChar(const QString &ch) {
    // auto close: {} [] ()
    if (ch == QStringLiteral("}")) {
        return QStringLiteral("{");
    } else if (ch == QStringLiteral("]")) {
        return QStringLiteral("[");
    } else if (ch == QStringLiteral(")")) {
        return QStringLiteral("(");
    } else {
        return {};
    }
}

QString QEditor::getPairedCloseChar(const QString &ch) {
    // auto close: {} [] ()
    if (ch == QStringLiteral("{")) {
        return QStringLiteral("}");
    } else if (ch == QStringLiteral("[")) {
        return QStringLiteral("]");
    } else if (ch == QStringLiteral("(")) {
        return QStringLiteral(")");
    } else {
        return {};
    }
}

/*!
        \internal
        \brief Copy the selection to the clipboard
*/
void QEditor::setClipboardSelection() {
    QClipboard *clipboard = QApplication::clipboard();

    if (!clipboard->supportsSelection() || !m_cursor.hasSelection())
        return;

    QMimeData *data = createMimeDataFromSelection();

    clipboard->setMimeData(data, QClipboard::Selection);
}

/*!
        \internal
        \brief Scroll contents

        Refer to QAbstractScrollArea doc for more info.
*/
void QEditor::scrollContentsBy(int dx, int dy) {
#ifdef Q_GL_EDITOR
    viewport()->update();
#else
    const int ls = m_doc->fontMetrics().lineSpacing();
    viewport()->scroll(dx, dy * ls);
#endif
}

/*!
        \internal
        \brief Workaround inconsistent width determination of viewport width
        accross platfroms when scrollbars are visible...
*/
int QEditor::wrapWidth() const {
#ifdef Q_WS_WIN
// if ( verticalScrollBar()->isVisible() )
//	return viewport()->width() - verticalScrollBar()->width();
#endif
    return viewport()->width();
}

/*!
        \internal
        \brief Slot called whenever document width changes

        Horizontal scrollbar is updated here.

        \note ensureCursorVisible() is NOT called.
*/
void QEditor::documentWidthChanged(int newWidth) {
    if (flag(LineWrap)) {
        horizontalScrollBar()->setMaximum(0);
        return;
    }

    int nv = qMax(0, newWidth - wrapWidth());

    horizontalScrollBar()->setMaximum(nv);

    // ensureCursorVisible();
}

/*!
        \internal
        \brief Slot called whenever document height changes

        Vertical scrollbar is updated here (maximum is changed
        and value is modified if needed to ensure that the cursor is
   visible)
*/
void QEditor::documentHeightChanged(int newHeight) {
    if (flag(LineWrap)) {
        m_doc->setWidthConstraint(wrapWidth());
    }
    const int ls = m_doc->fontMetrics().lineSpacing();
    verticalScrollBar()->setMaximum(
        qMax(0, 1 + (newHeight - viewport()->height()) / ls));
    // ensureCursorVisible();
}

/*!
        \internal
        \brief Request paint event upon modification
        \param i first modified line
        \param n number of modified lines
*/
void QEditor::repaintContent(int i, int n) {
    if (!m_doc)
        return;

#ifdef Q_GL_EDITOR
    viewport()->update();
#else
    if (n <= 0) {
        viewport()->update();
    }

    QRect frect = m_doc->lineRect(i);

    const int yoff = verticalOffset() + viewport()->height();

    if (frect.y() > yoff)
        return;

    if (n == 1) {
        frect.translate(0, -verticalOffset());
        // qDebug() << frect;
        viewport()->update(frect);
        return;
    }

    QRect lrect = m_doc->lineRect(i + n - 1);

    if ((n > 0) && (lrect.y() + lrect.height()) < verticalOffset())
        return;

    // qDebug("repainting %i lines starting from %ith one", n, i);

    // rect.setWidth(viewport()->width());
    // rect.setHeight(qMin(viewport()->height(), rect.height() * n));

    const int paintOffset = frect.y() - verticalOffset();
    const int paintHeight = lrect.y() + lrect.height() - frect.y();
    const int maxPaintHeight = viewport()->height() - paintOffset;

    QRect rect =
        QRect(frect.x(), paintOffset, viewport()->width(),
              (n <= 0) ? maxPaintHeight : qMin(maxPaintHeight, paintHeight));

    // qDebug() << rect;

    viewport()->update(rect);
#endif
}

/*!
        \internal
        \brief Update function called upon editing action
        \param i First modified line
        \param n Number of modified lines

        If more than one line has been modified this function
        causes a repaint from the first visible line to the end
        of the viewport due to the way QAbstractScrollArea
        handles scrolling.

        \note This function used to update formatting but
        the highlighting has been moved to QDocument recently
*/
void QEditor::updateContent(int i, int n) {
    if (!m_doc)
        return;

    // qDebug("updating %i, %i", i, n);

    bool cont = n > 1;

    repaintContent(i, cont ? -1 : n);
}

/*!
        \internal
*/
void QEditor::emitMarkChanged(QDocumentLineHandle *l, int mark, bool on) {
    emit markChanged(fileName(), l, mark, on);
}

/*! @} */