qworkspace.cpp

奇趣公司比较新的qt/emd版本

        ...
    }
    \endcode

    Child windows (MDI windows) are standard Qt widgets that are
    inserted into the workspace with addWindow(). As with top-level
    widgets, you can call functions such as show(), hide(),
    showMaximized(), and setWindowTitle() on a child window to change
    its appearance within the workspace. You can also provide widget
    flags to determine the layout of the decoration or the behavior of
    the widget itself.

    To change or retrieve the geometry of a child window, you must
    operate on its parentWidget(). The parentWidget() provides
    access to the decorated frame that contains the child window
    widget. When a child window is maximised, its decorated frame
    is hidden. If the top-level widget contains a menu bar, it will display
    the maximised window's operations menu to the left of the menu
    entries, and the window's controls to the right.

    A child window becomes active when it gets the keyboard focus,
    or when setFocus() is called. The user can activate a window by moving
    focus in the usual ways, for example by clicking a window or by pressing
    Tab. The workspace emits a signal windowActivated() when the active
    window changes, and the function activeWindow() returns a pointer to the
    active child window, or 0 if no window is active.

    The convenience function windowList() returns a list of all child
    windows. This information could be used in a popup menu
    containing a list of windows, for example. This feature is also
    available as part of the \l{Window Menu} Solution.

    QWorkspace provides two built-in layout strategies for child
    windows: cascade() and tile(). Both are slots so you can easily
    connect menu entries to them.

    \img qworkspace-arrange.png

    If you want your users to be able to work with child windows
    larger than the visible workspace area, set the scrollBarsEnabled
    property to true.

    \sa QDockWidget, {MDI Example}
*/


class QWorkspaceChild : public QWidget
{
    Q_OBJECT

    friend class QWorkspacePrivate;
    friend class QWorkspace;
    friend class QWorkspaceTitleBar;

public:
    QWorkspaceChild(QWidget* window, QWorkspace* parent=0, Qt::WindowFlags flags = 0);
    ~QWorkspaceChild();

    void setActive(bool);
    bool isActive() const;

    void adjustToFullscreen();

    QWidget* windowWidget() const;
    QWidget* iconWidget() const;

    void doResize();
    void doMove();

    QSize sizeHint() const;
    QSize minimumSizeHint() const;

    QSize baseSize() const;

    int frameWidth() const;

    void show();

    bool isWindowOrIconVisible() const;

signals:
    void showOperationMenu();
    void popupOperationMenu(const QPoint&);

public slots:
    void activate();
    void showMinimized();
    void showMaximized();
    void showNormal();
    void showShaded();
    void internalRaise();
    void titleBarDoubleClicked();

protected:
    void enterEvent(QEvent *);
    void leaveEvent(QEvent *);
    void childEvent(QChildEvent*);
    void resizeEvent(QResizeEvent *);
    void moveEvent(QMoveEvent *);
    bool eventFilter(QObject *, QEvent *);

    void paintEvent(QPaintEvent *);
    void changeEvent(QEvent *);

private:
    void updateMask();

    Q_DISABLE_COPY(QWorkspaceChild)

    QWidget *childWidget;
    QWidgetResizeHandler *widgetResizeHandler;
    QWorkspaceTitleBar *titlebar;
    QPointer<QWorkspaceTitleBar> iconw;
    QSize windowSize;
    QSize shadeRestore;
    QSize shadeRestoreMin;
    bool act                  :1;
    bool shademode            :1;
};

int QWorkspaceChild::frameWidth() const
{
    return contentsRect().left();
}



class QWorkspacePrivate : public QWidgetPrivate {
    Q_DECLARE_PUBLIC(QWorkspace)
public:
    QWorkspaceChild* active;
    QList<QWorkspaceChild *> windows;
    QList<QWorkspaceChild *> focus;
    QList<QWidget *> icons;
    QWorkspaceChild* maxWindow;
    QRect maxRestore;
    QPointer<QMDIControl> maxcontrols;
    QPointer<QMenuBar> maxmenubar;
    QHash<int, const char*> shortcutMap;

    int px;
    int py;
    QWidget *becomeActive;
    QPointer<QLabel> maxtools;
    QString topTitle;

    QMenu *popup, *toolPopup;
    enum WSActs { RestoreAct, MoveAct, ResizeAct, MinimizeAct, MaximizeAct, CloseAct, StaysOnTopAct, ShadeAct, NCountAct };
    QAction *actions[NCountAct];

    QScrollBar *vbar, *hbar;
    QWidget *corner;
    int yoffset, xoffset;
    QBrush background;

    void init();
    void insertIcon(QWidget* w);
    void removeIcon(QWidget* w);
    void place(QWidget*);

    QWorkspaceChild* findChild(QWidget* w);
    void showMaximizeControls();
    void hideMaximizeControls();
    void activateWindow(QWidget* w, bool change_focus = true);
    void hideChild(QWorkspaceChild *c);
    void showWindow(QWidget* w);
    void maximizeWindow(QWidget* w);
    void minimizeWindow(QWidget* w);
    void normalizeWindow(QWidget* w);

    QRect updateWorkspace();

private:
    void _q_normalizeActiveWindow();
    void _q_minimizeActiveWindow();
    void _q_showOperationMenu();
    void _q_popupOperationMenu(const QPoint&);
    void _q_operationMenuActivated(QAction *);
    void _q_scrollBarChanged();
    void _q_updateActions();
    bool inTitleChange;
};

static bool isChildOf(QWidget * child, QWidget * parent)
{
    if (!parent || !child)
        return false;
    QWidget * w = child;
    while(w && w != parent)
        w = w->parentWidget();
    return w != 0;
}

/*!
    Constructs a workspace with the given \a parent.
*/
QWorkspace::QWorkspace(QWidget *parent)
    : QWidget(*new QWorkspacePrivate, parent, 0)
{
    Q_D(QWorkspace);
    d->init();
}

#ifdef QT3_SUPPORT
/*!
    Use one of the constructors that doesn't take the \a name
    argument and then use setObjectName() instead.
*/
QWorkspace::QWorkspace(QWidget *parent, const char *name)
    : QWidget(*new QWorkspacePrivate, parent, 0)
{
    Q_D(QWorkspace);
    setObjectName(QString::fromAscii(name));
    d->init();
}
#endif // QT3_SUPPORT

/*!
    \internal
*/
void
QWorkspacePrivate::init()
{
    Q_Q(QWorkspace);

    maxcontrols = 0;
    active = 0;
    maxWindow = 0;
    maxtools = 0;
    px = 0;
    py = 0;
    becomeActive = 0;
    popup = new QMenu(q);
    toolPopup = new QMenu(q);
    popup->setObjectName(QLatin1String("qt_internal_mdi_popup"));
    toolPopup->setObjectName(QLatin1String("qt_internal_mdi_tool_popup"));

    actions[QWorkspacePrivate::RestoreAct] = new QAction(QIcon(q->style()->standardPixmap(QStyle::SP_TitleBarNormalButton)),
                                                         QWorkspace::tr("&Restore"), q);
    actions[QWorkspacePrivate::MoveAct] = new QAction(QWorkspace::tr("&Move"), q);
    actions[QWorkspacePrivate::ResizeAct] = new QAction(QWorkspace::tr("&Size"), q);
    actions[QWorkspacePrivate::MinimizeAct] = new QAction(QIcon(q->style()->standardPixmap(QStyle::SP_TitleBarMinButton)),
                                                          QWorkspace::tr("Mi&nimize"), q);
    actions[QWorkspacePrivate::MaximizeAct] = new QAction(QIcon(q->style()->standardPixmap(QStyle::SP_TitleBarMaxButton)),
                                                          QWorkspace::tr("Ma&ximize"), q);
    actions[QWorkspacePrivate::CloseAct] = new QAction(QIcon(q->style()->standardPixmap(QStyle::SP_TitleBarCloseButton)),
                                                          QWorkspace::tr("&Close")
#ifndef QT_NO_SHORTCUT
                                                          +QLatin1Char('\t')+(QString)QKeySequence(Qt::CTRL+Qt::Key_F4)
#endif
                                                          ,q);
    QObject::connect(actions[QWorkspacePrivate::CloseAct], SIGNAL(triggered()), q, SLOT(closeActiveWindow()));
    actions[QWorkspacePrivate::StaysOnTopAct] = new QAction(QWorkspace::tr("Stay on &Top"), q);
    actions[QWorkspacePrivate::StaysOnTopAct]->setChecked(true);
    actions[QWorkspacePrivate::ShadeAct] = new QAction(QIcon(q->style()->standardPixmap(QStyle::SP_TitleBarShadeButton)),
                                                          QWorkspace::tr("Sh&ade"), q);

    QObject::connect(popup, SIGNAL(aboutToShow()), q, SLOT(_q_updateActions()));
    QObject::connect(popup, SIGNAL(triggered(QAction*)), q, SLOT(_q_operationMenuActivated(QAction*)));
    popup->addAction(actions[QWorkspacePrivate::RestoreAct]);
    popup->addAction(actions[QWorkspacePrivate::MoveAct]);
    popup->addAction(actions[QWorkspacePrivate::ResizeAct]);
    popup->addAction(actions[QWorkspacePrivate::MinimizeAct]);
    popup->addAction(actions[QWorkspacePrivate::MaximizeAct]);
    popup->addSeparator();
    popup->addAction(actions[QWorkspacePrivate::CloseAct]);

    QObject::connect(toolPopup, SIGNAL(aboutToShow()), q, SLOT(_q_updateActions()));
    QObject::connect(toolPopup, SIGNAL(triggered(QAction*)), q, SLOT(_q_operationMenuActivated(QAction*)));
    toolPopup->addAction(actions[QWorkspacePrivate::MoveAct]);
    toolPopup->addAction(actions[QWorkspacePrivate::ResizeAct]);
    toolPopup->addAction(actions[QWorkspacePrivate::StaysOnTopAct]);
    toolPopup->addSeparator();
    toolPopup->addAction(actions[QWorkspacePrivate::ShadeAct]);
    toolPopup->addAction(actions[QWorkspacePrivate::CloseAct]);

#ifndef QT_NO_SHORTCUT
    // Set up shortcut bindings (id -> slot), most used first
    QList <QKeySequence> shortcuts = QKeySequence::keyBindings(QKeySequence::NextChild);
    foreach (QKeySequence seq, shortcuts)
        shortcutMap.insert(q->grabShortcut(seq), "activateNextWindow");

    shortcuts = QKeySequence::keyBindings(QKeySequence::PreviousChild);
    foreach (QKeySequence seq, shortcuts)
        shortcutMap.insert(q->grabShortcut(seq), "activatePreviousWindow");

    shortcuts = QKeySequence::keyBindings(QKeySequence::Close);
    foreach (QKeySequence seq, shortcuts)
        shortcutMap.insert(q->grabShortcut(seq), "closeActiveWindow");

    shortcutMap.insert(q->grabShortcut(QKeySequence(QLatin1String("ALT+-"))), "_q_showOperationMenu");
#endif // QT_NO_SHORTCUT

    q->setBackgroundRole(QPalette::Dark);
    q->setAutoFillBackground(true);
    q->setSizePolicy(QSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding));

    hbar = vbar = 0;
    corner = 0;
    xoffset = yoffset = 0;

    q->window()->installEventFilter(q);

    inTitleChange = false;
    updateWorkspace();
}

/*!
    Destroys the workspace and frees any allocated resources.
*/

QWorkspace::~QWorkspace()
{
}

/*! \reimp */
QSize QWorkspace::sizeHint() const
{
    QSize s(QApplication::desktop()->size());
    return QSize(s.width()*2/3, s.height()*2/3);
}


#ifdef QT3_SUPPORT
/*!
    Sets the background color to \a c.
    Use setBackground() instead.
*/
void QWorkspace::setPaletteBackgroundColor(const QColor & c)
{
    setBackground(c);
}

/*!
    Sets the background pixmap to \a pm.
    Use setBackground() instead.
*/
void QWorkspace::setPaletteBackgroundPixmap(const QPixmap & pm)
{
    setBackground(pm);
}
#endif // QT3_SUPPORT

/*!
    \property QWorkspace::background
    \brief the workspace's background
*/
QBrush QWorkspace::background() const
{
    Q_D(const QWorkspace);
    if (d->background.style() == Qt::NoBrush)
        return palette().dark();
    return d->background;
}

void QWorkspace::setBackground(const QBrush &background)
{
    Q_D(QWorkspace);
    d->background = background;
    setAttribute(Qt::WA_OpaquePaintEvent, background.style() == Qt::NoBrush);
    update();
}

/*!
    Adds widget \a w as new sub window to the workspace.  If \a flags
    are non-zero, they will override the flags set on the widget.

    Returns the widget used for the window frame.

    To remove the widget \a w from the workspace, simply call
    setParent() with the new parent (or 0 to make it a stand-alone
    window).
*/
QWidget * QWorkspace::addWindow(QWidget *w, Qt::WindowFlags flags)
{
    Q_D(QWorkspace);
    if (!w)
        return 0;

    w->setAutoFillBackground(true);

    QWidgetPrivate::adjustFlags(flags);

#if 0
    bool wasMaximized = w->isMaximized();
    bool wasMinimized = w->isMinimized();
#endif
    bool hasSize = w->testAttribute(Qt::WA_Resized);
    int x = w->x();
    int y = w->y();
    bool hasPos = w->testAttribute(Qt::WA_Moved);
    QSize s = w->size().expandedTo(qSmartMinSize(w));
    if (!hasSize && w->sizeHint().isValid())
        w->adjustSize();

    QWorkspaceChild* child = new QWorkspaceChild(w, this, flags);
    child->setObjectName(QLatin1String("qt_workspacechild"));
    child->installEventFilter(this);

    connect(child, SIGNAL(popupOperationMenu(QPoint)),
            this, SLOT(_q_popupOperationMenu(QPoint)));
    connect(child, SIGNAL(showOperationMenu()),
            this, SLOT(_q_showOperationMenu()));
    d->windows.append(child);
    if (child->isVisibleTo(this))
        d->focus.append(child);
    child->internalRaise();

    if (!hasPos)
        d->place(child);
    if (!hasSize)
        child->adjustSize();
    if (hasPos)
        child->move(x, y);

    return child;

#if 0
    if (wasMaximized)
        w->showMaximized();
    else if (wasMinimized)
        w->showMinimized();
    else if (!hasBeenHidden)
        d->activateWindow(w);