Long live Qt!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QMDIAREA_P_H
+#define QMDIAREA_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qmdiarea.h"
+#include "qmdisubwindow.h"
+
+#ifndef QT_NO_MDIAREA
+
+#include <QList>
+#include <QRect>
+#include <QPoint>
+#include <QtGui/qapplication.h>
+#include <private/qmdisubwindow_p.h>
+#include <private/qabstractscrollarea_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QMdi {
+class Rearranger
+{
+public:
+    enum Type {
+        RegularTiler,
+        SimpleCascader,
+        IconTiler
+    };
+
+    // Rearranges widgets relative to domain.
+    virtual void rearrange(QList<QWidget *> &widgets, const QRect &domain) const = 0;
+    virtual Type type() const = 0;
+    virtual ~Rearranger() {}
+};
+
+class RegularTiler : public Rearranger
+{
+    // Rearranges widgets according to a regular tiling pattern
+    // covering the entire domain.
+    // Both positions and sizes may change.
+    void rearrange(QList<QWidget *> &widgets, const QRect &domain) const;
+    inline Type type() const { return Rearranger::RegularTiler; }
+};
+
+class SimpleCascader : public Rearranger
+{
+    // Rearranges widgets according to a simple, regular cascading pattern.
+    // Widgets are resized to minimumSize.
+    // Both positions and sizes may change.
+    void rearrange(QList<QWidget *> &widgets, const QRect &domain) const;
+    inline Type type() const { return Rearranger::SimpleCascader; }
+};
+
+class IconTiler : public Rearranger
+{
+    // Rearranges icons (assumed to be the same size) according to a regular
+    // tiling pattern filling up the domain from the bottom.
+    // Only positions may change.
+    void rearrange(QList<QWidget *> &widgets, const QRect &domain) const;
+    inline Type type() const { return Rearranger::IconTiler; }
+};
+
+class Placer
+{
+public:
+    // Places the rectangle defined by 'size' relative to 'rects' and 'domain'.
+    // Returns the position of the resulting rectangle.
+    virtual QPoint place(
+        const QSize &size, const QList<QRect> &rects, const QRect &domain) const = 0;
+    virtual ~Placer() {}
+};
+
+class MinOverlapPlacer : public Placer
+{
+    QPoint place(const QSize &size, const QList<QRect> &rects, const QRect &domain) const;
+    static int accumulatedOverlap(const QRect &source, const QList<QRect> &rects);
+    static QRect findMinOverlapRect(const QList<QRect> &source, const QList<QRect> &rects);
+    static void getCandidatePlacements(
+        const QSize &size, const QList<QRect> &rects, const QRect &domain,
+        QList<QRect> &candidates);
+    static QPoint findBestPlacement(
+        const QRect &domain, const QList<QRect> &rects, QList<QRect> &source);
+    static void findNonInsiders(
+        const QRect &domain, QList<QRect> &source, QList<QRect> &result);
+    static void findMaxOverlappers(
+        const QRect &domain, const QList<QRect> &source, QList<QRect> &result);
+};
+} // namespace QMdi
+
+class QMdiAreaTabBar;
+class QMdiAreaPrivate : public QAbstractScrollAreaPrivate
+{
+    Q_DECLARE_PUBLIC(QMdiArea)
+public:
+    QMdiAreaPrivate();
+
+    // Variables.
+    QMdi::Rearranger *cascader;
+    QMdi::Rearranger *regularTiler;
+    QMdi::Rearranger *iconTiler;
+    QMdi::Placer *placer;
+#ifndef QT_NO_RUBBERBAND
+    QRubberBand *rubberBand;
+#endif
+    QMdiAreaTabBar *tabBar;
+    QList<QMdi::Rearranger *> pendingRearrangements;
+    QList< QPointer<QMdiSubWindow> > pendingPlacements;
+    QList< QPointer<QMdiSubWindow> > childWindows;
+    QList<int> indicesToActivatedChildren;
+    QPointer<QMdiSubWindow> active;
+    QPointer<QMdiSubWindow> aboutToBecomeActive;
+    QBrush background;
+    QMdiArea::WindowOrder activationOrder;
+    QMdiArea::AreaOptions options;
+    QMdiArea::ViewMode viewMode;
+#ifndef QT_NO_TABBAR
+    bool documentMode;
+#endif
+#ifndef QT_NO_TABWIDGET
+    QTabWidget::TabShape tabShape;
+    QTabWidget::TabPosition tabPosition;
+#endif
+    bool ignoreGeometryChange;
+    bool ignoreWindowStateChange;
+    bool isActivated;
+    bool isSubWindowsTiled;
+    bool showActiveWindowMaximized;
+    bool tileCalledFromResizeEvent;
+    bool updatesDisabledByUs;
+    bool inViewModeChange;
+    int indexToNextWindow;
+    int indexToPreviousWindow;
+    int indexToHighlighted;
+    int indexToLastActiveTab;
+    int resizeTimerId;
+    int tabToPreviousTimerId;
+
+    // Slots.
+    void _q_deactivateAllWindows(QMdiSubWindow *aboutToActivate = 0);
+    void _q_processWindowStateChanged(Qt::WindowStates oldState, Qt::WindowStates newState);
+    void _q_currentTabChanged(int index);
+
+    // Functions.
+    void appendChild(QMdiSubWindow *child);
+    void place(QMdi::Placer *placer, QMdiSubWindow *child);
+    void rearrange(QMdi::Rearranger *rearranger);
+    void arrangeMinimizedSubWindows();
+    void activateWindow(QMdiSubWindow *child);
+    void activateCurrentWindow();
+    void activateHighlightedWindow();
+    void emitWindowActivated(QMdiSubWindow *child);
+    void resetActiveWindow(QMdiSubWindow *child = 0);
+    void updateActiveWindow(int removedIndex, bool activeRemoved);
+    void updateScrollBars();
+    void internalRaise(QMdiSubWindow *child) const;
+    bool scrollBarsEnabled() const;
+    bool lastWindowAboutToBeDestroyed() const;
+    void setChildActivationEnabled(bool enable = true, bool onlyNextActivationEvent = false) const;
+    QRect resizeToMinimumTileSize(const QSize &minSubWindowSize, int subWindowCount);
+    void scrollBarPolicyChanged(Qt::Orientation, Qt::ScrollBarPolicy); // reimp
+    QMdiSubWindow *nextVisibleSubWindow(int increaseFactor, QMdiArea::WindowOrder,
+                                        int removed = -1, int fromIndex = -1) const;
+    void highlightNextSubWindow(int increaseFactor);
+    QList<QMdiSubWindow *> subWindowList(QMdiArea::WindowOrder, bool reversed = false) const;
+    void disconnectSubWindow(QObject *subWindow);
+    void setViewMode(QMdiArea::ViewMode mode);
+#ifndef QT_NO_TABBAR
+    void updateTabBarGeometry();
+    void refreshTabBar();
+#endif
+
+    inline void startResizeTimer()
+    {
+        Q_Q(QMdiArea);
+        if (resizeTimerId > 0)
+            q->killTimer(resizeTimerId);
+        resizeTimerId = q->startTimer(200);
+    }
+
+    inline void startTabToPreviousTimer()
+    {
+        Q_Q(QMdiArea);
+        if (tabToPreviousTimerId > 0)
+            q->killTimer(tabToPreviousTimerId);
+        tabToPreviousTimerId = q->startTimer(QApplication::keyboardInputInterval());
+    }
+
+    inline bool windowStaysOnTop(QMdiSubWindow *subWindow) const
+    {
+        if (!subWindow)
+            return false;
+        return subWindow->windowFlags() & Qt::WindowStaysOnTopHint;
+    }
+
+    inline bool isExplicitlyDeactivated(QMdiSubWindow *subWindow) const
+    {
+        if (!subWindow)
+            return true;
+        return subWindow->d_func()->isExplicitlyDeactivated;
+    }
+
+    inline void setActive(QMdiSubWindow *subWindow, bool active = true, bool changeFocus = true) const
+    {
+        if (subWindow)
+            subWindow->d_func()->setActive(active, changeFocus);
+    }
+
+#ifndef QT_NO_RUBBERBAND
+    inline void showRubberBandFor(QMdiSubWindow *subWindow)
+    {
+        if (!subWindow || !rubberBand)
+            return;
+        rubberBand->setGeometry(subWindow->geometry());
+        rubberBand->raise();
+        rubberBand->show();
+    }
+
+    inline void hideRubberBand()
+    {
+        if (rubberBand && rubberBand->isVisible())
+            rubberBand->hide();
+        indexToHighlighted = -1;
+    }
+#endif // QT_NO_RUBBERBAND
+};
+
+#endif // QT_NO_MDIAREA
+
+QT_END_NAMESPACE
+
+#endif // QMDIAREA_P_H