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QMainWindow Class Reference
[QtGui module]

The QMainWindow class provides a main application window. More...

 #include <QMainWindow>

Inherits QWidget.


Public Types

enum DockOption { AnimatedDocks, AllowNestedDocks, AllowTabbedDocks, ForceTabbedDocks, VerticalTabs }
flags DockOptions

Properties

  • 58 properties inherited from QWidget
  • 1 property inherited from QObject

Public Functions

QMainWindow ( QWidget * parent = 0, Qt::WindowFlags flags = 0 )
~QMainWindow ()
void addDockWidget ( Qt::DockWidgetArea area, QDockWidget * dockwidget )
void addDockWidget ( Qt::DockWidgetArea area, QDockWidget * dockwidget, Qt::Orientation orientation )
void addToolBar ( Qt::ToolBarArea area, QToolBar * toolbar )
void addToolBar ( QToolBar * toolbar )
QToolBar * addToolBar ( const QString & title )
void addToolBarBreak ( Qt::ToolBarArea area = Qt::TopToolBarArea )
QWidget * centralWidget () const
Qt::DockWidgetArea corner ( Qt::Corner corner ) const
virtual QMenu * createPopupMenu ()
DockOptions dockOptions () const
Qt::DockWidgetArea dockWidgetArea ( QDockWidget * dockwidget ) const
bool documentMode () const
QSize iconSize () const
void insertToolBar ( QToolBar * before, QToolBar * toolbar )
void insertToolBarBreak ( QToolBar * before )
bool isAnimated () const
bool isDockNestingEnabled () const
QMenuBar * menuBar () const
QWidget * menuWidget () const
void removeDockWidget ( QDockWidget * dockwidget )
void removeToolBar ( QToolBar * toolbar )
void removeToolBarBreak ( QToolBar * before )
bool restoreDockWidget ( QDockWidget * dockwidget )
bool restoreState ( const QByteArray & state, int version = 0 )
QByteArray saveState ( int version = 0 ) const
void setCentralWidget ( QWidget * widget )
void setCorner ( Qt::Corner corner, Qt::DockWidgetArea area )
void setDockOptions ( DockOptions options )
void setDocumentMode ( bool enabled )
void setIconSize ( const QSize & iconSize )
void setMenuBar ( QMenuBar * menuBar )
void setMenuWidget ( QWidget * menuBar )
void setStatusBar ( QStatusBar * statusbar )
void setTabPosition ( Qt::DockWidgetAreas areas, QTabWidget::TabPosition tabPosition )
void setTabShape ( QTabWidget::TabShape tabShape )
void setToolButtonStyle ( Qt::ToolButtonStyle toolButtonStyle )
void setUnifiedTitleAndToolBarOnMac ( bool set )
void splitDockWidget ( QDockWidget * first, QDockWidget * second, Qt::Orientation orientation )
QStatusBar * statusBar () const
QTabWidget::TabPosition tabPosition ( Qt::DockWidgetArea area ) const
QTabWidget::TabShape tabShape () const
QList<QDockWidget *> tabifiedDockWidgets ( QDockWidget * dockwidget ) const
void tabifyDockWidget ( QDockWidget * first, QDockWidget * second )
Qt::ToolBarArea toolBarArea ( QToolBar * toolbar ) const
bool toolBarBreak ( QToolBar * toolbar ) const
Qt::ToolButtonStyle toolButtonStyle () const
bool unifiedTitleAndToolBarOnMac () const
  • 217 public functions inherited from QWidget
  • 29 public functions inherited from QObject
  • 13 public functions inherited from QPaintDevice

Public Slots

void setAnimated ( bool enabled )
void setDockNestingEnabled ( bool enabled )
  • 19 public slots inherited from QWidget
  • 1 public slot inherited from QObject

Signals

void iconSizeChanged ( const QSize & iconSize )
void toolButtonStyleChanged ( Qt::ToolButtonStyle toolButtonStyle )

Reimplemented Protected Functions

virtual void contextMenuEvent ( QContextMenuEvent * event )
virtual bool event ( QEvent * event )
  • 37 protected functions inherited from QWidget
  • 7 protected functions inherited from QObject
  • 1 protected function inherited from QPaintDevice

Additional Inherited Members

  • 4 static public members inherited from QWidget
  • 5 static public members inherited from QObject
  • 37 protected functions inherited from QWidget
  • 7 protected functions inherited from QObject
  • 1 protected function inherited from QPaintDevice
  • 1 protected slot inherited from QWidget

Detailed Description

The QMainWindow class provides a main application window.

Qt Main Window Framework

A main window provides a framework for building an application's user interface. Qt has QMainWindow and its related classes for main window management. QMainWindow has its own layout to which you can add QToolBars, QDockWidgets, a QMenuBar, and a QStatusBar. The layout has a center area that can be occupied by any kind of widget. You can see an image of the layout below.

Note: Creating a main window without a central widget is not supported. You must have a central widget even if it is just a placeholder.

Creating Main Window Components

A central widget will typically be a standard Qt widget such as a QTextEdit or a QGraphicsView. Custom widgets can also be used for advanced applications. You set the central widget with setCentralWidget().

Main windows have either a single (SDI) or multiple (MDI) document interface. You create MDI applications in Qt by using a QMdiArea as the central widget.

We will now examine each of the other widgets that can be added to a main window. We give examples on how to create and add them.

Creating Menus

Qt implements menus in QMenu and QMainWindow keeps them in a QMenuBar. QActions are added to the menus, which display them as menu items.

You can add new menus to the main window's menu bar by calling menuBar(), which returns the QMenuBar for the window, and then add a menu with QMenuBar::addMenu().

QMainWindow comes with a default menu bar, but you can also set one yourself with setMenuBar(). If you wish to implement a custom menu bar (i.e., not use the QMenuBar widget), you can set it with setMenuWidget().

An example of how to create menus follows:

 void MainWindow::createMenus()
 {
     fileMenu = menuBar()->addMenu(tr("&File"));
     fileMenu->addAction(newAct);
     fileMenu->addAction(openAct);
     fileMenu->addAction(saveAct);

The createPopupMenu() function creates popup menus when the main window receives context menu events. The default implementation generates a menu with the checkable actions from the dock widgets and toolbars. You can reimplement createPopupMenu() for a custom menu.

Creating Toolbars

Toolbars are implemented in the QToolBar class. You add a toolbar to a main window with addToolBar().

You control the initial position of toolbars by assigning them to a specific Qt::ToolBarArea. You can split an area by inserting a toolbar break - think of this as a line break in text editing - with addToolBarBreak() or insertToolBarBreak(). You can also restrict placement by the user with QToolBar::setAllowedAreas() and QToolBar::setMovable().

The size of toolbar icons can be retrieved with iconSize(). The sizes are platform dependent; you can set a fixed size with setIconSize(). You can alter the appearance of all tool buttons in the toolbars with setToolButtonStyle().

An example of toolbar creation follows:

 void MainWindow::createToolBars()
 {
     fileToolBar = addToolBar(tr("File"));
     fileToolBar->addAction(newAct);

Creating Dock Widgets

Dock widgets are implemented in the QDockWidget class. A dock widget is a window that can be docked into the main window. You add dock widgets to a main window with addDockWidget().

There are four dock widget areas as given by the Qt::DockWidgetArea enum: left, right, top, and bottom. You can specify which dock widget area that should occupy the corners where the areas overlap with setCorner(). By default each area can only contain one row (vertical or horizontal) of dock widgets, but if you enable nesting with setDockNestingEnabled(), dock widgets can be added in either direction.

Two dock widgets may also be stacked on top of each other. A QTabBar is then used to select which of the widgets that should be displayed.

We give an example of how to create and add dock widgets to a main window:

     QDockWidget *dockWidget = new QDockWidget(tr("Dock Widget"), this);
     dockWidget->setAllowedAreas(Qt::LeftDockWidgetArea |
                                 Qt::RightDockWidgetArea);
     dockWidget->setWidget(dockWidgetContents);
     addDockWidget(Qt::LeftDockWidgetArea, dockWidget);

The Status Bar

You can set a status bar with setStatusBar(), but one is created the first time statusBar() (which returns the main window's status bar) is called. See QStatusBar for information on how to use it.

Storing State

QMainWindow can store the state of its layout with saveState(); it can later be retrieved with restoreState(). It is the position and size (relative to the size of the main window) of the toolbars and dock widgets that are stored.

See also QMenuBar, QToolBar, QStatusBar, QDockWidget, Application Example, Dock Widgets Example, MDI Example, SDI Example, and Menus Example.


Member Type Documentation

enum QMainWindow::DockOption
flags QMainWindow::DockOptions

This enum contains flags that specify the docking behavior of QMainWindow.

ConstantValueDescription
QMainWindow::AnimatedDocks0x01Identical to the animated property.
QMainWindow::AllowNestedDocks0x02Identical to the dockNestingEnabled property.
QMainWindow::AllowTabbedDocks0x04The user can drop one dock widget "on top" of another. The two widgets are stacked and a tab bar appears for selecting which one is visible.
QMainWindow::ForceTabbedDocks0x08Each dock area contains a single stack of tabbed dock widgets. In other words, dock widgets cannot be placed next to each other in a dock area. If this option is set, AllowNestedDocks has no effect.
QMainWindow::VerticalTabs0x10The two vertical dock areas on the sides of the main window show their tabs vertically. If this option is not set, all dock areas show their tabs at the bottom. Implies AllowTabbedDocks. See also setTabPosition().

These options only control how dock widgets may be dropped in a QMainWindow. They do not re-arrange the dock widgets to conform with the specified options. For this reason they should be set before any dock widgets are added to the main window. Exceptions to this are the AnimatedDocks and VerticalTabs options, which may be set at any time.

This enum was introduced in Qt 4.3.

The DockOptions type is a typedef for QFlags<DockOption>. It stores an OR combination of DockOption values.


Property Documentation

animated : bool

This property holds whether manipulating dock widgets and tool bars is animated.

When a dock widget or tool bar is dragged over the main window, the main window adjusts its contents to indicate where the dock widget or tool bar will be docked if it is dropped. Setting this property causes QMainWindow to move its contents in a smooth animation. Clearing this property causes the contents to snap into their new positions.

By default, this property is set. It may be cleared if the main window contains widgets which are slow at resizing or repainting themselves.

Setting this property is identical to setting the AnimatedDocks option using setDockOptions().

This property was introduced in Qt 4.2.

Access functions:

bool isAnimated () const
void setAnimated ( bool enabled )

dockNestingEnabled : bool

This property holds whether docks can be nested.

If this property is false, dock areas can only contain a single row (horizontal or vertical) of dock widgets. If this property is true, the area occupied by a dock widget can be split in either direction to contain more dock widgets.

Dock nesting is only necessary in applications that contain a lot of dock widgets. It gives the user greater freedom in organizing their main window. However, dock nesting leads to more complex (and less intuitive) behavior when a dock widget is dragged over the main window, since there are more ways in which a dropped dock widget may be placed in the dock area.

Setting this property is identical to setting the AllowNestedDocks option using setDockOptions().

This property was introduced in Qt 4.2.

Access functions:

bool isDockNestingEnabled () const
void setDockNestingEnabled ( bool enabled )

dockOptions : DockOptions

This property holds the docking behavior of QMainWindow.

The default value is AnimatedDocks | AllowTabbedDocks.

This property was introduced in Qt 4.3.

Access functions:

DockOptions dockOptions () const
void setDockOptions ( DockOptions options )

documentMode : bool

This property holds whether the tab bar for tabbed dockwidgets is set to document mode.

The default is false.

This property was introduced in Qt 4.5.

Access functions:

bool documentMode () const
void setDocumentMode ( bool enabled )

See also QTabBar::documentMode.

iconSize : QSize

This property holds size of toolbar icons in this mainwindow.

The default is the default tool bar icon size of the GUI style. Note that the icons used must be at least of this size as the icons are only scaled down.

Access functions:

QSize iconSize () const
void setIconSize ( const QSize & iconSize )

tabShape : QTabWidget::TabShape

This property holds the tab shape used for tabbed dock widgets.

The default is QTabWidget::Rounded.

This property was introduced in Qt 4.5.

Access functions:

QTabWidget::TabShape tabShape () const
void setTabShape ( QTabWidget::TabShape tabShape )

See also setTabPosition().

toolButtonStyle : Qt::ToolButtonStyle

This property holds style of toolbar buttons in this mainwindow.

The default is Qt::ToolButtonIconOnly.

Access functions:

Qt::ToolButtonStyle toolButtonStyle () const
void setToolButtonStyle ( Qt::ToolButtonStyle toolButtonStyle )

unifiedTitleAndToolBarOnMac : bool

This property holds whether the window uses the unified title and toolbar look on Mac OS X.

This property is false by default and only has any effect on Mac OS X 10.4 or higher.

If set to true, then the top toolbar area is replaced with a Carbon HIToolbar or a Cocoa NSToolbar (depending on whether Qt was built with Carbon or Cocoa). All toolbars in the top toolbar area and any toolbars added afterwards are moved to that. This means a couple of things.

  • QToolBars in this toolbar area are not movable and you cannot drag other toolbars to it
  • Toolbar breaks are not respected or preserved
  • Any custom widgets in the toolbar will not be shown if the toolbar becomes too small (only actions will be shown)
  • Before Qt 4.5, if you called showFullScreen() on the main window, the QToolbar would disappear since it is considered to be part of the title bar. Qt 4.5 and up will now work around this by pulling the toolbars out and back into the regular toolbar and vice versa when you swap out. However, a good practice would be that turning off the unified toolbar before you call showFullScreen() and restoring it after you call showNormal().

Setting this back to false will remove these restrictions.

The Qt::WA_MacBrushedMetal attribute takes precedence over this property.

This property was introduced in Qt 4.3.

Access functions:

bool unifiedTitleAndToolBarOnMac () const
void setUnifiedTitleAndToolBarOnMac ( bool set )

Member Function Documentation

QMainWindow::QMainWindow ( QWidget * parent = 0, Qt::WindowFlags flags = 0 )

Constructs a QMainWindow with the given parent and the specified widget flags.

QMainWindow sets the Qt::Window flag itself, and will hence always be created as a top-level widget.

QMainWindow::~QMainWindow ()

Destroys the main window.

void QMainWindow::addDockWidget ( Qt::DockWidgetArea area, QDockWidget * dockwidget )

Adds the given dockwidget to the specified area.

void QMainWindow::addDockWidget ( Qt::DockWidgetArea area, QDockWidget * dockwidget, Qt::Orientation orientation )

Adds dockwidget into the given area in the direction specified by the orientation.

void QMainWindow::addToolBar ( Qt::ToolBarArea area, QToolBar * toolbar )

Adds the toolbar into the specified area in this main window. The toolbar is placed at the end of the current tool bar block (i.e. line). If the main window already manages toolbar then it will only move the toolbar to area.

See also insertToolBar(), addToolBarBreak(), and insertToolBarBreak().

void QMainWindow::addToolBar ( QToolBar * toolbar )

This is an overloaded function.

Equivalent of calling addToolBar(Qt::TopToolBarArea, toolbar)

QToolBar * QMainWindow::addToolBar ( const QString & title )

This is an overloaded function.

Creates a QToolBar object, setting its window title to title, and inserts it into the top toolbar area.

See also setWindowTitle().

void QMainWindow::addToolBarBreak ( Qt::ToolBarArea area = Qt::TopToolBarArea )

Adds a toolbar break to the given area after all the other objects that are present.

QWidget * QMainWindow::centralWidget () const

Returns the central widget for the main window. This function returns zero if the central widget has not been set.

See also setCentralWidget().

void QMainWindow::contextMenuEvent ( QContextMenuEvent * event )   [virtual protected]

Reimplemented from QWidget::contextMenuEvent().

Qt::DockWidgetArea QMainWindow::corner ( Qt::Corner corner ) const

Returns the dock widget area that occupies the specified corner.

See also setCorner().

QMenu * QMainWindow::createPopupMenu ()   [virtual]

Returns a popup menu containing checkable entries for the toolbars and dock widgets present in the main window. If there are no toolbars and dock widgets present, this function returns a null pointer.

By default, this function is called by the main window when the user activates a context menu, typically by right-clicking on a toolbar or a dock widget.

If you want to create a custom popup menu, reimplement this function and return a newly-created popup menu. Ownership of the popup menu is transferred to the caller.

See also addDockWidget(), addToolBar(), and menuBar().

Qt::DockWidgetArea QMainWindow::dockWidgetArea ( QDockWidget * dockwidget ) const

Returns the Qt::DockWidgetArea for dockwidget. If dockwidget has not been added to the main window, this function returns Qt::NoDockWidgetArea.

See also addDockWidget(), splitDockWidget(), and Qt::DockWidgetArea.

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

Reimplemented from QObject::event().

void QMainWindow::iconSizeChanged ( const QSize & iconSize )   [signal]

This signal is emitted when the size of the icons used in the window is changed. The new icon size is passed in iconSize.

You can connect this signal to other components to help maintain a consistent appearance for your application.

See also setIconSize().

void QMainWindow::insertToolBar ( QToolBar * before, QToolBar * toolbar )

Inserts the toolbar into the area occupied by the before toolbar so that it appears before it. For example, in normal left-to-right layout operation, this means that toolbar will appear to the left of the toolbar specified by before in a horizontal toolbar area.

See also insertToolBarBreak(), addToolBar(), and addToolBarBreak().

void QMainWindow::insertToolBarBreak ( QToolBar * before )

Inserts a toolbar break before the toolbar specified by before.

QMenuBar * QMainWindow::menuBar () const

Returns the menu bar for the main window. This function creates and returns an empty menu bar if the menu bar does not exist.

If you want all windows in a Mac application to share one menu bar, don't use this function to create it, because the menu bar created here will have this QMainWindow as its parent. Instead, you must create a menu bar that does not have a parent, which you can then share among all the Mac windows. Create a parent-less menu bar this way:

 QMenuBar *menuBar = new QMenuBar(0);

See also setMenuBar().

QWidget * QMainWindow::menuWidget () const

Returns the menu bar for the main window. This function returns null if a menu bar hasn't been constructed yet.

This function was introduced in Qt 4.2.

See also setMenuWidget().

void QMainWindow::removeDockWidget ( QDockWidget * dockwidget )

Removes the dockwidget from the main window layout and hides it. Note that the dockwidget is not deleted.

void QMainWindow::removeToolBar ( QToolBar * toolbar )

Removes the toolbar from the main window layout and hides it. Note that the toolbar is not deleted.

void QMainWindow::removeToolBarBreak ( QToolBar * before )

Removes a toolbar break previously inserted before the toolbar specified by before.

bool QMainWindow::restoreDockWidget ( QDockWidget * dockwidget )

Restores the state of dockwidget if it is created after the call to restoreState(). Returns true if the state was restored; otherwise returns false.

See also restoreState() and saveState().

bool QMainWindow::restoreState ( const QByteArray & state, int version = 0 )

Restores the state of this mainwindow's toolbars and dockwidgets. The version number is compared with that stored in state. If they do not match, the mainwindow's state is left unchanged, and this function returns false; otherwise, the state is restored, and this function returns true.

To restore geometry saved using QSettings, you can use code like this:

 void MainWindow::readSettings()
 {
     QSettings settings("MyCompany", "MyApp");
     restoreGeometry(settings.value("myWidget/geometry").toByteArray());
     restoreState(settings.value("myWidget/windowState").toByteArray());
 }

See also saveState(), QWidget::saveGeometry(), QWidget::restoreGeometry(), and restoreDockWidget().

QByteArray QMainWindow::saveState ( int version = 0 ) const

Saves the current state of this mainwindow's toolbars and dockwidgets. The version number is stored as part of the data.

The objectName property is used to identify each QToolBar and QDockWidget. You should make sure that this property is unique for each QToolBar and QDockWidget you add to the QMainWindow

To restore the saved state, pass the return value and version number to restoreState().

To save the geometry when the window closes, you can implement a close event like this:

 void MyMainWindow::closeEvent(QCloseEvent *event)
 {
     QSettings settings("MyCompany", "MyApp");
     settings.setValue("geometry", saveGeometry());
     settings.setValue("windowState", saveState());
     QMainWindow::closeEvent(event);
 }

See also restoreState(), QWidget::saveGeometry(), and QWidget::restoreGeometry().

void QMainWindow::setCentralWidget ( QWidget * widget )

Sets the given widget to be the main window's central widget.

Note: QMainWindow takes ownership of the widget pointer and deletes it at the appropriate time.

See also centralWidget().

void QMainWindow::setCorner ( Qt::Corner corner, Qt::DockWidgetArea area )

Sets the given dock widget area to occupy the specified corner.

See also corner().

void QMainWindow::setMenuBar ( QMenuBar * menuBar )

Sets the menu bar for the main window to menuBar.

Note: QMainWindow takes ownership of the menuBar pointer and deletes it at the appropriate time.

See also menuBar().

void QMainWindow::setMenuWidget ( QWidget * menuBar )

Sets the menu bar for the main window to menuBar.

QMainWindow takes ownership of the menuBar pointer and deletes it at the appropriate time.

This function was introduced in Qt 4.2.

See also menuWidget().

void QMainWindow::setStatusBar ( QStatusBar * statusbar )

Sets the status bar for the main window to statusbar.

Setting the status bar to 0 will remove it from the main window. Note that QMainWindow takes ownership of the statusbar pointer and deletes it at the appropriate time.

See also statusBar().

void QMainWindow::setTabPosition ( Qt::DockWidgetAreas areas, QTabWidget::TabPosition tabPosition )

Sets the tab position for the given dock widget areas to the specified tabPosition. By default, all dock areas show their tabs at the bottom.

Note: The VerticalTabs dock option overrides the tab positions set by this method.

This function was introduced in Qt 4.5.

See also tabPosition() and setTabShape().

void QMainWindow::splitDockWidget ( QDockWidget * first, QDockWidget * second, Qt::Orientation orientation )

Splits the space covered by the first dock widget into two parts, moves the first dock widget into the first part, and moves the second dock widget into the second part.

The orientation specifies how the space is divided: A Qt::Horizontal split places the second dock widget to the right of the first; a Qt::Vertical split places the second dock widget below the first.

Note: if first is currently in a tabbed docked area, second will be added as a new tab, not as a neighbor of first. This is because a single tab can contain only one dock widget.

Note: The Qt::LayoutDirection influences the order of the dock widgets in the two parts of the divided area. When right-to-left layout direction is enabled, the placing of the dock widgets will be reversed.

See also tabifyDockWidget(), addDockWidget(), and removeDockWidget().

QStatusBar * QMainWindow::statusBar () const

Returns the status bar for the main window. This function creates and returns an empty status bar if the status bar does not exist.

See also setStatusBar().

QTabWidget::TabPosition QMainWindow::tabPosition ( Qt::DockWidgetArea area ) const

Returns the tab position for area.

Note: The VerticalTabs dock option overrides the tab positions returned by this function.

This function was introduced in Qt 4.5.

See also setTabPosition() and tabShape().

QList<QDockWidget *> QMainWindow::tabifiedDockWidgets ( QDockWidget * dockwidget ) const

Returns the dock widgets that are tabified together with dockwidget.

This function was introduced in Qt 4.5.

See also tabifyDockWidget().

void QMainWindow::tabifyDockWidget ( QDockWidget * first, QDockWidget * second )

Moves second dock widget on top of first dock widget, creating a tabbed docked area in the main window.

See also tabifiedDockWidgets().

Qt::ToolBarArea QMainWindow::toolBarArea ( QToolBar * toolbar ) const

Returns the Qt::ToolBarArea for toolbar. If toolbar has not been added to the main window, this function returns Qt::NoToolBarArea.

See also addToolBar(), addToolBarBreak(), and Qt::ToolBarArea.

bool QMainWindow::toolBarBreak ( QToolBar * toolbar ) const

Returns whether there is a toolbar break before the toolbar.

See also addToolBarBreak() and insertToolBarBreak().

void QMainWindow::toolButtonStyleChanged ( Qt::ToolButtonStyle toolButtonStyle )   [signal]

This signal is emitted when the style used for tool buttons in the window is changed. The new style is passed in toolButtonStyle.

You can connect this signal to other components to help maintain a consistent appearance for your application.

See also setToolButtonStyle().

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