/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtGui module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#ifndef QMDIAREA_P_H+
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#define QMDIAREA_P_H+
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+
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//+
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//  W A R N I N G+
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//  -------------+
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//+
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// This file is not part of the Qt API.  It exists purely as an+
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// implementation detail.  This header file may change from version to+
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// version without notice, or even be removed.+
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//+
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// We mean it.+
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//+
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+
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#include "qmdiarea.h"+
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#include "qmdisubwindow.h"+
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+
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#ifndef QT_NO_MDIAREA+
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+
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#include <QList>+
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#include <QRect>+
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#include <QPoint>+
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#include <QtGui/qapplication.h>+
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#include <private/qmdisubwindow_p.h>+
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#include <private/qabstractscrollarea_p.h>+
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+
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QT_BEGIN_NAMESPACE+
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+
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namespace QMdi {+
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class Rearranger+
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{+
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public:+
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    enum Type {+
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        RegularTiler,+
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        SimpleCascader,+
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        IconTiler+
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    };+
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+
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    // Rearranges widgets relative to domain.+
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    virtual void rearrange(QList<QWidget *> &widgets, const QRect &domain) const = 0;+
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    virtual Type type() const = 0;+
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    virtual ~Rearranger() {}+
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};+
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+
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class RegularTiler : public Rearranger+
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{+
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    // Rearranges widgets according to a regular tiling pattern+
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    // covering the entire domain.+
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    // Both positions and sizes may change.+
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    void rearrange(QList<QWidget *> &widgets, const QRect &domain) const;+
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    inline Type type() const { return Rearranger::RegularTiler; }+
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};+
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+
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class SimpleCascader : public Rearranger+
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{+
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    // Rearranges widgets according to a simple, regular cascading pattern.+
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    // Widgets are resized to minimumSize.+
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    // Both positions and sizes may change.+
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    void rearrange(QList<QWidget *> &widgets, const QRect &domain) const;+
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    inline Type type() const { return Rearranger::SimpleCascader; }+
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};+
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+
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class IconTiler : public Rearranger+
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{+
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    // Rearranges icons (assumed to be the same size) according to a regular+
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    // tiling pattern filling up the domain from the bottom.+
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    // Only positions may change.+
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    void rearrange(QList<QWidget *> &widgets, const QRect &domain) const;+
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    inline Type type() const { return Rearranger::IconTiler; }+
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};+
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+
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class Placer+
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{+
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public:+
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    // Places the rectangle defined by 'size' relative to 'rects' and 'domain'.+
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    // Returns the position of the resulting rectangle.+
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    virtual QPoint place(+
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        const QSize &size, const QList<QRect> &rects, const QRect &domain) const = 0;+
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    virtual ~Placer() {}+
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};+
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+
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class MinOverlapPlacer : public Placer+
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{+
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    QPoint place(const QSize &size, const QList<QRect> &rects, const QRect &domain) const;+
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    static int accumulatedOverlap(const QRect &source, const QList<QRect> &rects);+
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    static QRect findMinOverlapRect(const QList<QRect> &source, const QList<QRect> &rects);+
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    static void getCandidatePlacements(+
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        const QSize &size, const QList<QRect> &rects, const QRect &domain,+
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        QList<QRect> &candidates);+
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    static QPoint findBestPlacement(+
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        const QRect &domain, const QList<QRect> &rects, QList<QRect> &source);+
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    static void findNonInsiders(+
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        const QRect &domain, QList<QRect> &source, QList<QRect> &result);+
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    static void findMaxOverlappers(+
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        const QRect &domain, const QList<QRect> &source, QList<QRect> &result);+
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};+
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} // namespace QMdi+
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+
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class QMdiAreaTabBar;+
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class QMdiAreaPrivate : public QAbstractScrollAreaPrivate+
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{+
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    Q_DECLARE_PUBLIC(QMdiArea)+
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public:+
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    QMdiAreaPrivate();+
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+
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    // Variables.+
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    QMdi::Rearranger *cascader;+
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    QMdi::Rearranger *regularTiler;+
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    QMdi::Rearranger *iconTiler;+
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    QMdi::Placer *placer;+
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#ifndef QT_NO_RUBBERBAND+
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    QRubberBand *rubberBand;+
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#endif+
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    QMdiAreaTabBar *tabBar;+
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    QList<QMdi::Rearranger *> pendingRearrangements;+
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    QList< QPointer<QMdiSubWindow> > pendingPlacements;+
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    QList< QPointer<QMdiSubWindow> > childWindows;+
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    QList<int> indicesToActivatedChildren;+
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    QPointer<QMdiSubWindow> active;+
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    QPointer<QMdiSubWindow> aboutToBecomeActive;+
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    QBrush background;+
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    QMdiArea::WindowOrder activationOrder;+
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    QMdiArea::AreaOptions options;+
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    QMdiArea::ViewMode viewMode;+
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#ifndef QT_NO_TABBAR+
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    bool documentMode;+
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#endif+
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#ifndef QT_NO_TABWIDGET+
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    QTabWidget::TabShape tabShape;+
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    QTabWidget::TabPosition tabPosition;+
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#endif+
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    bool ignoreGeometryChange;+
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    bool ignoreWindowStateChange;+
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    bool isActivated;+
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    bool isSubWindowsTiled;+
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    bool showActiveWindowMaximized;+
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    bool tileCalledFromResizeEvent;+
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    bool updatesDisabledByUs;+
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    bool inViewModeChange;+
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    int indexToNextWindow;+
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    int indexToPreviousWindow;+
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    int indexToHighlighted;+
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    int indexToLastActiveTab;+
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    int resizeTimerId;+
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    int tabToPreviousTimerId;+
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+
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    // Slots.+
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    void _q_deactivateAllWindows(QMdiSubWindow *aboutToActivate = 0);+
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    void _q_processWindowStateChanged(Qt::WindowStates oldState, Qt::WindowStates newState);+
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    void _q_currentTabChanged(int index);+
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+
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    // Functions.+
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    void appendChild(QMdiSubWindow *child);+
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    void place(QMdi::Placer *placer, QMdiSubWindow *child);+
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    void rearrange(QMdi::Rearranger *rearranger);+
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    void arrangeMinimizedSubWindows();+
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    void activateWindow(QMdiSubWindow *child);+
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    void activateCurrentWindow();+
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    void activateHighlightedWindow();+
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    void emitWindowActivated(QMdiSubWindow *child);+
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    void resetActiveWindow(QMdiSubWindow *child = 0);+
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    void updateActiveWindow(int removedIndex, bool activeRemoved);+
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    void updateScrollBars();+
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    void internalRaise(QMdiSubWindow *child) const;+
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    bool scrollBarsEnabled() const;+
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    bool lastWindowAboutToBeDestroyed() const;+
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    void setChildActivationEnabled(bool enable = true, bool onlyNextActivationEvent = false) const;+
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    QRect resizeToMinimumTileSize(const QSize &minSubWindowSize, int subWindowCount);+
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    void scrollBarPolicyChanged(Qt::Orientation, Qt::ScrollBarPolicy); // reimp+
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    QMdiSubWindow *nextVisibleSubWindow(int increaseFactor, QMdiArea::WindowOrder,+
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                                        int removed = -1, int fromIndex = -1) const;+
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    void highlightNextSubWindow(int increaseFactor);+
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    QList<QMdiSubWindow *> subWindowList(QMdiArea::WindowOrder, bool reversed = false) const;+
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    void disconnectSubWindow(QObject *subWindow);+
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    void setViewMode(QMdiArea::ViewMode mode);+
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#ifndef QT_NO_TABBAR+
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    void updateTabBarGeometry();+
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    void refreshTabBar();+
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#endif+
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+
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    inline void startResizeTimer()+
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    {+
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        Q_Q(QMdiArea);+
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        if (resizeTimerId > 0)+
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            q->killTimer(resizeTimerId);+
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        resizeTimerId = q->startTimer(200);+
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    }+
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+
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    inline void startTabToPreviousTimer()+
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    {+
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        Q_Q(QMdiArea);+
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        if (tabToPreviousTimerId > 0)+
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            q->killTimer(tabToPreviousTimerId);+
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        tabToPreviousTimerId = q->startTimer(QApplication::keyboardInputInterval());+
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    }+
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+
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    inline bool windowStaysOnTop(QMdiSubWindow *subWindow) const+
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    {+
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        if (!subWindow)+
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            return false;+
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        return subWindow->windowFlags() & Qt::WindowStaysOnTopHint;+
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    }+
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+
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    inline bool isExplicitlyDeactivated(QMdiSubWindow *subWindow) const+
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    {+
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        if (!subWindow)+
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            return true;+
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        return subWindow->d_func()->isExplicitlyDeactivated;+
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    }+
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+
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    inline void setActive(QMdiSubWindow *subWindow, bool active = true, bool changeFocus = true) const+
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    {+
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        if (subWindow)+
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            subWindow->d_func()->setActive(active, changeFocus);+
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    }+
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+
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#ifndef QT_NO_RUBBERBAND+
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    inline void showRubberBandFor(QMdiSubWindow *subWindow)+
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    {+
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        if (!subWindow || !rubberBand)+
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            return;+
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        rubberBand->setGeometry(subWindow->geometry());+
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        rubberBand->raise();+
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        rubberBand->show();+
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    }+
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+
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    inline void hideRubberBand()+
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    {+
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        if (rubberBand && rubberBand->isVisible())+
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            rubberBand->hide();+
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        indexToHighlighted = -1;+
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    }+
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#endif // QT_NO_RUBBERBAND+
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};+
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+
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#endif // QT_NO_MDIAREA+
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+
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QT_END_NAMESPACE+
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+
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#endif // QMDIAREA_P_H+
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