source: trunk/src/gui/widgets/qdockarealayout_p.h@ 1021

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#ifndef QDOCKAREALAYOUT_P_H
#define QDOCKAREALAYOUT_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 "QtCore/qrect.h"
#include "QtCore/qpair.h"
#include "QtCore/qlist.h"
#include "QtCore/qvector.h"
#include "QtGui/qlayout.h"

#ifndef QT_NO_DOCKWIDGET

QT_BEGIN_NAMESPACE

class QLayoutItem;
class QWidget;
class QLayoutItem;
class QDockAreaLayoutInfo;
class QPlaceHolderItem;
class QDockWidget;
class QMainWindow;
class QWidgetAnimator;
class QMainWindowLayout;
struct QLayoutStruct;
class QTabBar;

// The classes in this file represent the tree structure that represents all the docks
// Also see the wiki internal documentation
// At the root of the tree is: QDockAreaLayout, which handles all 4 sides, so there is only one.
// For each side it has one QDockAreaLayoutInfo child. (See QDockAreaLayout::docks.)
// The QDockAreaLayoutInfo have QDockAreaLayoutItems as children (See QDockAreaLayoutInfo::item_list),
// which then has one QDockAreaLayoutInfo as a child. (QDockAreaLayoutItem::subInfo) or
// a widgetItem if this is a node of the tree (QDockAreaLayoutItem::widgetItem)
//
// A path indetifies uniquely one object in this tree, the first number being the side and all the following
// indexes into the QDockAreaLayoutInfo::item_list.

struct QDockAreaLayoutItem
{
    enum ItemFlags { NoFlags = 0, GapItem = 1, KeepSize = 2 };

    QDockAreaLayoutItem(QLayoutItem *_widgetItem = 0);
    QDockAreaLayoutItem(QDockAreaLayoutInfo *_subinfo);
    QDockAreaLayoutItem(QPlaceHolderItem *_placeHolderItem);
    QDockAreaLayoutItem(const QDockAreaLayoutItem &other);
    ~QDockAreaLayoutItem();

    QDockAreaLayoutItem &operator = (const QDockAreaLayoutItem &other);

    bool skip() const;
    QSize minimumSize() const;
    QSize maximumSize() const;
    QSize sizeHint() const;
    bool expansive(Qt::Orientation o) const;
    bool hasFixedSize(Qt::Orientation o) const;

    QLayoutItem *widgetItem;
    QDockAreaLayoutInfo *subinfo;
    QPlaceHolderItem *placeHolderItem;
    int pos;
    int size;
    uint flags;
};

class Q_AUTOTEST_EXPORT QPlaceHolderItem
{
public:
    QPlaceHolderItem() : hidden(false), window(false) {}
    QPlaceHolderItem(QWidget *w);

    QString objectName;
    bool hidden, window;
    QRect topLevelRect;
};

class Q_AUTOTEST_EXPORT QDockAreaLayoutInfo
{
public:
    QDockAreaLayoutInfo();
    QDockAreaLayoutInfo(const int *_sep, QInternal::DockPosition _dockPos, Qt::Orientation _o,
                        int tbhape, QMainWindow *window);

    QSize minimumSize() const;
    QSize maximumSize() const;
    QSize sizeHint() const;
    QSize size() const;

    bool insertGap(const QList<int> &path, QLayoutItem *dockWidgetItem);
    QLayoutItem *plug(const QList<int> &path);
    QLayoutItem *unplug(const QList<int> &path);
    enum TabMode { NoTabs, AllowTabs, ForceTabs };
    QList<int> gapIndex(const QPoint &pos, bool nestingEnabled,
                            TabMode tabMode) const;
    void remove(const QList<int> &path);
    void unnest(int index);
    void split(int index, Qt::Orientation orientation, QLayoutItem *dockWidgetItem);
    void tab(int index, QLayoutItem *dockWidgetItem);
    QDockAreaLayoutItem &item(const QList<int> &path);
    QDockAreaLayoutInfo *info(const QList<int> &path);
    QDockAreaLayoutInfo *info(QWidget *widget);

    enum { // sentinel values used to validate state data
        SequenceMarker = 0xfc,
        TabMarker = 0xfa,
        WidgetMarker = 0xfb
    };
    void saveState(QDataStream &stream) const;
    bool restoreState(QDataStream &stream, QList<QDockWidget*> &widgets, bool testing);

    void fitItems();
    bool expansive(Qt::Orientation o) const;
    int changeSize(int index, int size, bool below);
    QRect itemRect(int index) const;
    QRect itemRect(const QList<int> &path) const;
    QRect separatorRect(int index) const;
    QRect separatorRect(const QList<int> &path) const;

    void clear();
    bool isEmpty() const;
    bool hasFixedSize() const;
    QList<int> findSeparator(const QPoint &pos) const;
    int next(int idx) const;
    int prev(int idx) const;

    QList<int> indexOf(QWidget *widget) const;
    QList<int> indexOfPlaceHolder(const QString &objectName) const;

    void apply(bool animate);

    void paintSeparators(QPainter *p, QWidget *widget, const QRegion &clip,
                            const QPoint &mouse) const;
    QRegion separatorRegion() const;
    int separatorMove(int index, int delta);

    QLayoutItem *itemAt(int *x, int index) const;
    QLayoutItem *takeAt(int *x, int index);
    void deleteAllLayoutItems();