WingHexExplorer2/3rdparty/qcodeedit2/lib/qpanellayout.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 "qpanellayout.h"

/*!
        \file qpanellayout.cpp
        \brief Implementation of the QPanelLayout class.
*/

#include "qdebug.h"
#include "qeditor.h"
#include "qpanel.h"

#include <QScrollBar>
#include <QWidget>

#ifdef Q_WS_WIN
// panel position fix required on some systems to work around a bug in
// QAbstractScrollArea
#define _PANEL_POSITION_FIX_
#endif

/*!
        \class QPanelLayout
        \brief A specialized layout taking care of panel display

        The panel layout is specialized in several ways :
        <ul>
        <li>It only operates on specific widgets (which inherit QPanel)</li>
        <li>It can only layout widgets in the viewport margins of a QEditor
   (could work with any QAbstractScrollArea if a single method was made public
   instead of protected...) so it does not qualify as a "real" layout  (contrary
   to grid/box layouts)</li> <li>It positions widgets on the border of the
   editor in the same way the Border Layout example does (most of the layout
   code actually comes from there).</li> <li>It provides
   serialization/deserialization of its layout structure</li>
        </ul>
*/

/*
        The layouting code is inspired from a Qt4 example : Border Layout
*/

/*!
        \brief ctor
*/
QPanelLayout::QPanelLayout(QEditor *p) : QLayout(p), m_parent(p) {
    setSpacing(0);
}

/*!
        \brief ctor
        \param layout structure to deserailize
*/
QPanelLayout::QPanelLayout(const QString &layout, QEditor *p)
    : QLayout(p), m_parent(p) {
    setSpacing(0);
    addSerialized(layout);
}

/*!
        \brief dtor
*/
QPanelLayout::~QPanelLayout() {
    QLayoutItem *l;

    while ((l = QPanelLayout::takeAt(0)))
        delete l;
}

/*!
        \return A serialized layout strucure
*/
QString QPanelLayout::serialized() const {
    /*
            Scheme :

            QPanelLayout::Position '{' comma-separated list of identifiers '}'
    */

    QHash<int, QString> posMap;

    for (int i = 0; i < m_list.size(); ++i) {
        PanelWrapper *wrapper = m_list.at(i);
        Position position = wrapper->position;

        QPanel *panel = qobject_cast<QPanel *>(wrapper->item->widget());

        if (!panel)
            continue;

        if (!posMap.contains(position)) {
            posMap[position] =
                QString::number(position) + "{" + panel->id() + "}";
        } else {
            QString &ref = posMap[position];

            ref.insert(ref.size() - 2, QString(",") + panel->id());
        }
    }

    return QStringList(posMap.values()).join("");
}

/*!
        \brief Add the content of a serialized layout structure
*/
void QPanelLayout::addSerialized(const QString &layout) {
    // qDebug("layout : %s", qPrintable(layout));

    int last = 0, i = 0;
    bool inList = false;
    Position position = West;

    while (i < layout.length()) {
        if (inList) {
            if (layout.at(i) == '}')
                inList = false;

            if (!inList || (layout.at(i) == ',')) {
                QPanel *panel =
                    QPanel::panel(layout.mid(last, i - last), m_parent);

                if (panel) {
                    panel->attach(m_parent);
                    addWidget(panel, position);

                    // qDebug("\tpanel : %s", qPrintable(layout.mid(last, i -
                    // last)));
                }

                last = i + 1;
            }
        } else if (layout.at(i) == '{') {
            inList = true;
            position = Position(layout.mid(last, i - last).toInt());

            // qDebug("position : %i [%s]", position,
            // qPrintable(layout.mid(last, i - last)));

            last = i + 1;
        }

        ++i;
    }

    update();
}

/*!
        \return the list of panels managed by the layout
*/
QList<QPanel *> QPanelLayout::panels() const {
    QList<QPanel *> l;

    foreach (PanelWrapper *w, m_list) {
        QPanel *p = qobject_cast<QPanel *>(w->item->widget());

        if (p)
            l << p;
    }

    return l;
}

/*!
        \return the count of managed panels
*/
int QPanelLayout::count() const { return m_list.count(); }

/*!
        \internal
*/
bool QPanelLayout::hasHeightForWidth() const { return false; }

/*!
        \internal
*/
Qt::Orientations QPanelLayout::expandingDirections() const {
    return Qt::Horizontal | Qt::Vertical;
}

/*!
        \internal
*/
QSize QPanelLayout::sizeHint() const { return calculateSize(SizeHint); }

/*!
        \internal
*/
QSize QPanelLayout::minimumSize() const { return calculateSize(MinimumSize); }

/*!
        \internal
*/
void QPanelLayout::addItem(QLayoutItem *item) { add(item, West); }

/*!
        \brief Add a panel at a given position
*/
void QPanelLayout::addWidget(QWidget *widget, Position position) {
    add(new QWidgetItem(widget), position);
}

/*!
        \internal
*/
QLayoutItem *QPanelLayout::itemAt(int idx) const {
    PanelWrapper *wrapper = m_list.value(idx);

    if (wrapper)
        return wrapper->item;
    else
        return 0;
}

/*!
        \internal
*/
QLayoutItem *QPanelLayout::takeAt(int idx) {
    if ((idx >= 0) && (idx < m_list.size())) {
        PanelWrapper *layoutStruct = m_list.takeAt(idx);
        return layoutStruct->item;
    }

    return 0;
}

/*!
        \internal
*/
void QPanelLayout::setGeometry(const QRect &r) {
    QScrollBar *vb = m_parent->verticalScrollBar(),
               *hb = m_parent->horizontalScrollBar();

    QRect rect(r.x(), r.y(),
               r.width() - (vb->isVisibleTo(m_parent) ? vb->width() : 0),
               r.height() - (hb->isVisibleTo(m_parent) ? hb->height() : 0));

    int i, eastWidth = 0, westWidth = 0, northHeight = 0, southHeight = 0,
           centerHeight = 0;

    QLayout::setGeometry(rect);

    for (i = 0; i < m_list.size(); ++i) {
        PanelWrapper *wrapper = m_list.at(i);
        QLayoutItem *item = wrapper->item;
        Position position = wrapper->position;

        if (item->isEmpty())
            continue;

        if (position == North) {
            item->setGeometry(QRect(rect.x(), northHeight, rect.width(),
                                    item->sizeHint().height()));

            northHeight += item->geometry().height() + spacing();
        } else if (position == South) {
            item->setGeometry(QRect(item->geometry().x(), item->geometry().y(),
                                    rect.width(), item->sizeHint().height()));

            southHeight += item->geometry().height() + spacing();

            item->setGeometry(QRect(
                rect.x(), rect.y() + rect.height() - southHeight + spacing(),
                item->geometry().width(), item->geometry().height()));
        }
    }

    centerHeight = rect.height() - northHeight - southHeight;

    for (i = 0; i < m_list.size(); ++i) {
        PanelWrapper *wrapper = m_list.at(i);
        QLayoutItem *item = wrapper->item;
        Position position = wrapper->position;

        if (item->isEmpty())
            continue;

        if (position == West) {
            item->setGeometry(QRect(rect.x() + westWidth, northHeight,
                                    item->sizeHint().width(), centerHeight));

            westWidth += item->geometry().width() + spacing();
        } else if (position == East) {
            item->setGeometry(QRect(item->geometry().x(), item->geometry().y(),
                                    item->sizeHint().width(), centerHeight));

            eastWidth += item->geometry().width() + spacing();

            item->setGeometry(QRect(
                rect.x() + rect.width() - eastWidth + spacing(), northHeight,
                item->geometry().width(), item->geometry().height()));
        }
    }

    /*
    if ( center )
            center->item->setGeometry(QRect(westWidth, northHeight,
                                                                            rect.width()
    - eastWidth - westWidth, centerHeight));
    */
    // qDebug("{%i, %i, %i, %i}", westWidth, northHeight, eastWidth,
    // southHeight);

    // qDebug() << westWidth;
    m_parent->setPanelMargins(westWidth, northHeight, eastWidth, southHeight);
}

/*!
        \internal
*/
void QPanelLayout::add(QLayoutItem *item, Position position) {
    QPanel *p;

    if ((p = qobject_cast<QPanel *>(item->widget()))) {
        // p->setParent(m_parent);
        p->setVisible(p->defaultVisibility());
    }

    m_list.append(new PanelWrapper(item, position));
}

/*!
        \internal
*/
QSize QPanelLayout::calculateSize(SizeType sizeType) const {
    QSize totalSize;

    for (int i = 0; i < m_list.size(); ++i) {
        QSize itemSize;
        PanelWrapper *wrapper = m_list.at(i);
        Position position = wrapper->position;

        if (sizeType == MinimumSize)
            itemSize = wrapper->item->minimumSize();
        else // ( sizeType == SizeHint )
            itemSize = wrapper->item->sizeHint();

        if ((position == North) ||
            (position == South)) // || (position == Center) )
            totalSize.rheight() += itemSize.height();

        if ((position == West) ||
            (position == East)) // || (position == Center) )
            totalSize.rwidth() += itemSize.width();
    }

    return totalSize;
}