Member Function Documentation

QMdiSubWindow::QMdiSubWindow(QWidget *parent = nullptr, Qt::WindowFlags flags = Qt::WindowFlags())

Constructs a new QMdiSubWindow widget. The parent and flags arguments are passed to QWidget's constructor.

Instead of using addSubWindow(), it is also simply possible to use setParent() when you add the subwindow to a QMdiArea.

Note that only QMdiSubWindows can be set as children of QMdiArea; you cannot, for instance, write:

//bad code
QMdiArea mdiArea;
QTextEdit editor(&mdiArea); // invalid child widget

See also QMdiArea::addSubWindow().

[signal] void QMdiSubWindow::aboutToActivate()

QMdiSubWindow emits this signal immediately before it is activated. After the subwindow has been activated, the QMdiArea that manages the subwindow will also emit the subWindowActivated() signal.

See also QMdiArea::subWindowActivated().

[slot] void QMdiSubWindow::showShaded()

Calling this function makes the subwindow enter the shaded mode. When the subwindow is shaded, only the title bar is visible.

Although shading is not supported by all styles, this function will still show the subwindow as shaded, regardless of whether support for shading is available. However, when used with styles without shading support, the user will be unable to return from shaded mode through the user interface (e.g., through a shade button in the title bar).

See also isShaded().

[slot] void QMdiSubWindow::showSystemMenu()

Shows the system menu below the system menu icon in the title bar.

See also setSystemMenu() and systemMenu().

[signal] void QMdiSubWindow::windowStateChanged(Qt::WindowStates oldState, Qt::WindowStates newState)

QMdiSubWindow emits this signal after the window state changes. oldState is the window state before it changed, and newState is the new, current state.

[virtual] QMdiSubWindow::~QMdiSubWindow()

Destroys the subwindow.

See also QMdiArea::removeSubWindow().

[override virtual protected] void QMdiSubWindow::changeEvent(QEvent *changeEvent)

Reimplements: QWidget::changeEvent(QEvent *event).

[override virtual protected] void QMdiSubWindow::childEvent(QChildEvent *childEvent)

Reimplements: QObject::childEvent(QChildEvent *event).

[override virtual protected] void QMdiSubWindow::closeEvent(QCloseEvent *closeEvent)

Reimplements: QWidget::closeEvent(QCloseEvent *event).

[override virtual protected] void QMdiSubWindow::contextMenuEvent(QContextMenuEvent *contextMenuEvent)

Reimplements: QWidget::contextMenuEvent(QContextMenuEvent *event).

[override virtual protected] bool QMdiSubWindow::event(QEvent *event)

Reimplements: QWidget::event(QEvent *event).

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

Reimplements: QObject::eventFilter(QObject *watched, QEvent *event).

[override virtual protected] void QMdiSubWindow::focusInEvent(QFocusEvent *focusInEvent)

Reimplements: QWidget::focusInEvent(QFocusEvent *event).

[override virtual protected] void QMdiSubWindow::focusOutEvent(QFocusEvent *focusOutEvent)

Reimplements: QWidget::focusOutEvent(QFocusEvent *event).

[override virtual protected] void QMdiSubWindow::hideEvent(QHideEvent *hideEvent)

Reimplements: QWidget::hideEvent(QHideEvent *event).

bool QMdiSubWindow::isShaded() const

Returns true if this window is shaded; otherwise returns false.

A window is shaded if it is collapsed so that only the title bar is visible.

[override virtual protected] void QMdiSubWindow::keyPressEvent(QKeyEvent *keyEvent)

Reimplements: QWidget::keyPressEvent(QKeyEvent *event).

[override virtual protected] void QMdiSubWindow::leaveEvent(QEvent *leaveEvent)

Reimplements: QWidget::leaveEvent(QEvent *event).

QMdiArea *QMdiSubWindow::mdiArea() const

Returns the area containing this sub-window, or nullptr if there is none.

This function was introduced in Qt 4.4.

See also QMdiArea::addSubWindow().

[override virtual] QSize QMdiSubWindow::minimumSizeHint() const

Reimplements an access function for property: QWidget::minimumSizeHint.

[override virtual protected] void QMdiSubWindow::mouseDoubleClickEvent(QMouseEvent *mouseEvent)

Reimplements: QWidget::mouseDoubleClickEvent(QMouseEvent *event).

[override virtual protected] void QMdiSubWindow::mouseMoveEvent(QMouseEvent *mouseEvent)

Reimplements: QWidget::mouseMoveEvent(QMouseEvent *event).

[override virtual protected] void QMdiSubWindow::mousePressEvent(QMouseEvent *mouseEvent)

Reimplements: QWidget::mousePressEvent(QMouseEvent *event).

[override virtual protected] void QMdiSubWindow::mouseReleaseEvent(QMouseEvent *mouseEvent)

Reimplements: QWidget::mouseReleaseEvent(QMouseEvent *event).

[override virtual protected] void QMdiSubWindow::moveEvent(QMoveEvent *moveEvent)

Reimplements: QWidget::moveEvent(QMoveEvent *event).

[override virtual protected] void QMdiSubWindow::paintEvent(QPaintEvent *paintEvent)

Reimplements: QWidget::paintEvent(QPaintEvent *event).

[override virtual protected] void QMdiSubWindow::resizeEvent(QResizeEvent *resizeEvent)

Reimplements: QWidget::resizeEvent(QResizeEvent *event).

Warning: When maximizing or restoring a subwindow, the resulting call to this function may have an invalid QResizeEvent::oldSize().

void QMdiSubWindow::setOption(QMdiSubWindow::SubWindowOption option, bool on = true)

If on is true, option is enabled on the subwindow; otherwise it is disabled. See SubWindowOption for the effect of each option.

See also SubWindowOption and testOption().

void QMdiSubWindow::setSystemMenu(QMenu *systemMenu)

Sets systemMenu as the current system menu for this subwindow.

By default, each QMdiSubWindow has a standard system menu.

QActions for the system menu created by QMdiSubWindow will automatically be updated depending on the current window state; e.g., the minimize action will be disabled after the window is minimized.

QActions added by the user are not updated by QMdiSubWindow.

QMdiSubWindow takes ownership of systemMenu; you do not have to delete it. Any existing menus will be deleted.

See also systemMenu() and showSystemMenu().

void QMdiSubWindow::setWidget(QWidget *widget)

Sets widget as the internal widget of this subwindow. The internal widget is displayed in the center of the subwindow beneath the title bar.

QMdiSubWindow takes temporary ownership of widget; you do not have to delete it. Any existing internal widget will be removed and reparented to the root window.

See also widget().

[override virtual protected] void QMdiSubWindow::showEvent(QShowEvent *showEvent)

Reimplements: QWidget::showEvent(QShowEvent *event).

[override virtual] QSize QMdiSubWindow::sizeHint() const

Reimplements an access function for property: QWidget::sizeHint.

QMenu *QMdiSubWindow::systemMenu() const

Returns a pointer to the current system menu, or zero if no system menu is set. QMdiSubWindow provides a default system menu, but you can also set the menu with setSystemMenu().

See also setSystemMenu() and showSystemMenu().

bool QMdiSubWindow::testOption(QMdiSubWindow::SubWindowOption option) const

Returns true if option is enabled; otherwise returns false.

See also SubWindowOption and setOption().

[override virtual protected] void QMdiSubWindow::timerEvent(QTimerEvent *timerEvent)

Reimplements: QObject::timerEvent(QTimerEvent *event).

QWidget *QMdiSubWindow::widget() const

Returns the current internal widget.

See also setWidget().