QMdiArea Class

      QMainWindow *mainWindow = new QMainWindow;
      mainWindow->setCentralWidget(mdiArea);

成员函数

QMdiArea::QMdiArea(QWidget *parent = Q_NULLPTR)

Constructs an empty mdi area. parent is passed to QWidget's constructor.

QMdiArea::~QMdiArea()

Destroys the MDI area.

[slot] void QMdiArea::activateNextSubWindow()

Gives the keyboard focus to another window in the list of child windows. The window activated will be the next one determined by the current activation order.

参见 activatePreviousSubWindow() and QMdiArea::WindowOrder.

[slot] void QMdiArea::activatePreviousSubWindow()

Gives the keyboard focus to another window in the list of child windows. The window activated will be the previous one determined by the current activation order.

参见 activateNextSubWindow() and QMdiArea::WindowOrder.

QMdiSubWindow *QMdiArea::activeSubWindow() const

Returns a pointer to the current active subwindow. If no window is currently active, 0 is returned.

Subwindows are treated as top-level windows with respect to window state, i.e., if a widget outside the MDI area is the active window, no subwindow will be active. Note that if a widget in the window in which the MDI area lives gains focus, the window will be activated.

参见 setActiveSubWindow() and Qt::WindowState.

QMdiSubWindow *QMdiArea::addSubWindow(QWidget *widget, Qt::WindowFlags windowFlags = Qt::WindowFlags())

Adds widget as a new subwindow to the MDI area. If windowFlags are non-zero, they will override the flags set on the widget.

The widget can be either a QMdiSubWindow or another QWidget (in which case the MDI area will create a subwindow and set the widget as the internal widget).

Note: Once the subwindow has been added, its parent will be the viewport widget of the QMdiArea.

      QMdiArea mdiArea;
      QMdiSubWindow *subWindow1 = new QMdiSubWindow;
      subWindow1->setWidget(internalWidget1);
      subWindow1->setAttribute(Qt::WA_DeleteOnClose);
      mdiArea.addSubWindow(subWindow1);

      QMdiSubWindow *subWindow2 =
          mdiArea.addSubWindow(internalWidget2);

When you create your own subwindow, you must set the Qt::WA_DeleteOnClose widget attribute if you want the window to be deleted when closed in the MDI area. If not, the window will be hidden and the MDI area will not activate the next subwindow.

Returns the QMdiSubWindow that is added to the MDI area.

参见 removeSubWindow().

[slot] void QMdiArea::cascadeSubWindows()

Arranges all the child windows in a cascade pattern.

参见 tileSubWindows().

[virtual protected] void QMdiArea::childEvent(QChildEvent *childEvent)

重新实现 QObject::childEvent().

[slot] void QMdiArea::closeActiveSubWindow()

Closes the active subwindow.

参见 closeAllSubWindows().

[slot] void QMdiArea::closeAllSubWindows()

Closes all subwindows by sending a QCloseEvent to each window. You may receive subWindowActivated() signals from subwindows before they are closed (if the MDI area activates the subwindow when another is closing).

Subwindows that ignore the close event will remain open.

参见 closeActiveSubWindow().

QMdiSubWindow *QMdiArea::currentSubWindow() const

Returns a pointer to the current subwindow, or 0 if there is no current subwindow.

This function will return the same as activeSubWindow() if the QApplication containing QMdiArea is active.

参见 activeSubWindow() and QApplication::activeWindow().

[virtual protected] bool QMdiArea::event(QEvent *event)

重新实现 QObject::event().

[virtual protected] bool QMdiArea::eventFilter(QObject *object, QEvent *event)

重新实现 QObject::eventFilter().

[virtual] QSize QMdiArea::minimumSizeHint() const

重新实现 QWidget::minimumSizeHint().

[virtual protected] void QMdiArea::paintEvent(QPaintEvent *paintEvent)

重新实现 QWidget::paintEvent().

void QMdiArea::removeSubWindow(QWidget *widget)

Removes widget from the MDI area. The widget must be either a QMdiSubWindow or a widget that is the internal widget of a subwindow. Note widget is never actually deleted by QMdiArea. If a QMdiSubWindow is passed in its parent is set to 0 and it is removed, but if an internal widget is passed in the child widget is set to 0 but the QMdiSubWindow is not removed.

参见 addSubWindow().

[virtual protected] void QMdiArea::resizeEvent(QResizeEvent *resizeEvent)

重新实现 QWidget::resizeEvent().

[virtual protected] void QMdiArea::scrollContentsBy(int dx, int dy)

重新实现 QAbstractScrollArea::scrollContentsBy().

[slot] void QMdiArea::setActiveSubWindow(QMdiSubWindow *window)

Activates the subwindow window. If window is 0, any current active window is deactivated.

参见 activeSubWindow().

void QMdiArea::setOption(AreaOption option, bool on = true)

If on is true, option is enabled on the MDI area; otherwise it is disabled. See AreaOption for the effect of each option.

参见 AreaOption and testOption().

[virtual protected slot] void QMdiArea::setupViewport(QWidget *viewport)

重新实现 QAbstractScrollArea::setupViewport().

This slot is called by QAbstractScrollArea after setViewport() has been called. Reimplement this function in a subclass of QMdiArea to initialize the new viewport before it is used.

参见 setViewport().

[virtual protected] void QMdiArea::showEvent(QShowEvent *showEvent)

重新实现 QWidget::showEvent().

[virtual] QSize QMdiArea::sizeHint() const

重新实现 QWidget::sizeHint().

[signal] void QMdiArea::subWindowActivated(QMdiSubWindow *window)

QMdiArea emits this signal after window has been activated. When window is 0, QMdiArea has just deactivated its last active window, and there are no active windows on the workspace.

参见 QMdiArea::activeSubWindow().

QList<QMdiSubWindow *> QMdiArea::subWindowList(WindowOrder order = CreationOrder) const

Returns a list of all subwindows in the MDI area. If order is CreationOrder (the default), the windows are sorted in the order in which they were inserted into the workspace. If order is StackingOrder, the windows are listed in their stacking order, with the topmost window as the last item in the list. If order is ActivationHistoryOrder, the windows are listed according to their recent activation history.

参见 WindowOrder.

bool QMdiArea::testOption(AreaOption option) const

Returns true if option is enabled; otherwise returns false.

参见 AreaOption and setOption().

[slot] void QMdiArea::tileSubWindows()

Arranges all child windows in a tile pattern.

参见 cascadeSubWindows().

[virtual protected] void QMdiArea::timerEvent(QTimerEvent *timerEvent)

重新实现 QObject::timerEvent().

[virtual protected] bool QMdiArea::viewportEvent(QEvent *event)

重新实现 QAbstractScrollArea::viewportEvent().