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QPopupMenu Class Reference

The QPopupMenu class provides a popup menu widget. More...

#include <qpopupmenu.h>

Inherits QFrame and QMenuData.

List of all member functions.

Public Members

Signals

Important Inherited Members

Properties

Protected Members

Detailed Description

The QPopupMenu class provides a popup menu widget.

A popup menu widget is a selection menu. It can be either a pull-down menu in a menu bar or a standalone context (popup) menu. Pull-down menus are shown by the menu bar when the user clicks on the respective item or hits the specified shortcut key. Use QMenuBar::insertItem() to insert a popup menu into a menu bar. Show a context menu either asynchronously with popup() or synchronously with exec().

Technically, a popup menu consists of a list of menu items. You add items with insertItem(). An item is either a string, a pixmap or a custom item that provides its own drawing function (see QCustomMenuItem). In addition, items can have an optional icon drawn on the very left side and an accelerator key such as "Ctrl+X". The accelerator can also be changed at run-time by holding the left mouse button over an item and pressing the new accelerator.

There are three kinds of menu items: separators, menu items that perform an action and menu items that show a submenu. Separators are inserted with insertSeparator(). For submenus, you pass a pointer to a QPopupMenu in your call to insertItem(). All other items are considered action items.

When inserting action items you usually specify a receiver and a slot. The receiver will be notifed whenever the item is selected. In addition, QPopupMenu provides two signals, activated() and highlighted(), which signal the identifier of the respective menu item. It is sometimes practical to connect several items to one slot. To distinguish between them, specify a slot that takes an integer argument and use setItemParameter() to associate a unique value with each item.

You clear a popup menu with clear() and remove single items with removeItem() or removeItemAt().

A popup menu can display check marks for certain items when enabled with setCheckable(TRUE). You check or uncheck items with setItemChecked().

Items are either enabled or disabled. You toggle their state with setItemEnabled(). Just before a popup menu becomes visible, it emits the aboutToShow() signal. You can use this signal to set the correct enabled/disabled states of all menu items before the user sees it. The corresponding aboutToHide() signal is emitted when the menu hides again.

You can provide What's This? help for single menu items with setWhatsThis(). See QWhatsThis for general information about this kind of lightweight online help.

For ultimate flexibility, you can also add entire widgets as items into a popup menu (for example, a color selector).

A QPopupMenu can also provide a tear-off menu. A tear-off menu is a top-level window that contains a copy of the menu. This makes it possible for the user to "tear off" frequently used menus and position them in a convenient place on the screen. If you want that functionality for a certain menu, insert a tear-off handle with insertTearOffHandle(). If you want to include custom widgets in a tear-off menu, you should connect to the popup menu's signal (using connectItem() and the item ID that insertTearOffHandle() returns), and add the custom widgets you want to include. When using tear-off menus, bear in mind that the concept isn't typically used on Microsoft Windows so users may not be familiar with it. Consider using a QToolBar instead.

menu/menu.cpp is a typical example of QMenuBar and QPopupMenu use.

See also QMenuBar, GUI Design Handbook: Menu, Drop-Down and Pop-Up, Main Window and Related Classes and Basic Widgets.

Member Function Documentation

QPopupMenu::QPopupMenu ( QWidget * parent = 0, const char * name = 0 )

Constructs a popup menu with parent as a parent and name as object name.

Although a popup menu is always a top-level widget, if a parent is passed the popup menu will be deleted when that parent is destroyed (as with any other QObject).

QPopupMenu::~QPopupMenu ()

Destroys the popup menu.

void QPopupMenu::aboutToHide () [signal]

This signal is emitted just before the popup menu is hidden after it has been displayed.

Warning: Do not open a widget in a slot connected to this signal.

See also aboutToShow(), setItemEnabled(), setItemChecked(), insertItem() and removeItem().

void QPopupMenu::aboutToShow () [signal]

This signal is emitted just before the popup menu is displayed. You can connect it to any slot that sets up the menu contents (e.g. to ensure that the right items are enabled).

See also aboutToHide(), setItemEnabled(), setItemChecked(), insertItem() and removeItem().

Example: mdi/application.cpp.

QKeySequence QMenuData::accel ( int id ) const

Returns the accelerator key that has been defined for the menu item id, or 0 if it has no accelerator key.

See also setAccel(), QAccel and qnamespace.h.

void QPopupMenu::activated ( int id ) [signal]

This signal is emitted when a menu item is selected; id is the id of the selected item.

Normally, you connect each menu item to a single slot using QMenuData::insertItem(), but sometimes you will want to connect several items to a single slot (most often if the user selects from an array). This signal is useful in such cases.

See also highlighted() and QMenuData::insertItem().

Examples: grapher/grapher.cpp, helpviewer/helpwindow.cpp, qdir/qdir.cpp, qwerty/qwerty.cpp, scrollview/scrollview.cpp and showimg/showimg.cpp.

void QMenuData::changeItem ( int id, const QString & text )

Changes the text of the menu item id to text. If the item has an icon, the icon remains unchanged.

See also text().

void QMenuData::changeItem ( int id, const QPixmap & pixmap )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Changes the pixmap of the menu item id to the pixmap pixmap. If the item has an icon, the icon is unchanged.

See also pixmap().

void QMenuData::changeItem ( int id, const QIconSet & icon, const QString & text )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Changes the iconset and text of the menu item id to the icon and text respectively.

See also pixmap().

void QMenuData::changeItem ( int id, const QIconSet & icon, const QPixmap & pixmap )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Changes the iconset and pixmap of the menu item id to icon and pixmap respectively.

See also pixmap().

void QMenuData::clear ()

Removes all menu items.

See also removeItem() and removeItemAt().

Examples: mdi/application.cpp and qwerty/qwerty.cpp.

int QPopupMenu::columns () const [protected]

If a popup menu does not fit on the screen it lays itself out in multiple columns until it does fit.

This functions returns the number of columns necessary.

See also sizeHint.

bool QMenuData::connectItem ( int id, const QObject * receiver, const char * member )

Connects the menu item with identifier id to receiver's member slot or signal.

The receiver's slot/signal is activated when the menu item is activated.

See also disconnectItem() and setItemParameter().

Example: menu/menu.cpp.

bool QMenuData::disconnectItem ( int id, const QObject * receiver, const char * member )

Disconnects the receiver's member from the menu item with identifier id.

All connections are removed when the menu data object is destroyed.

See also connectItem() and setItemParameter().

void QPopupMenu::drawContents ( QPainter * p ) [virtual protected]

Draws all menu items using painter p.

Reimplemented from QFrame.

void QPopupMenu::drawItem ( QPainter * p, int tab_, QMenuItem * mi, bool act, int x, int y, int w, int h ) [protected]

Draws menu item mi in the area x, y, w, h, using painter p. The item is drawn active if act is TRUE or drawn inactive if act is FALSE. The rightmost tab_ pixels are used for accelerator text.

See also QStyle::drawControl().

int QPopupMenu::exec ()

Executes this popup synchronously.

This is equivalent to exec(mapToGlobal(QPoint(0,0))). In most situations you'll want to specify the position yourself, for example at the current mouse position: 

      exec(QCursor::pos());
or aligned to a widget: 
      exec(somewidget.mapToGlobal(QPoint(0,0)));

Examples: fileiconview/qfileiconview.cpp and scribble/scribble.cpp.

int QPopupMenu::exec ( const QPoint & pos, int indexAtPoint = 0 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Executes this popup synchronously.

Opens the popup menu so that the item number indexAtPoint will be at the specified global position pos. To translate a widget's local coordinates into global coordinates, use QWidget::mapToGlobal().

The return code is the id of the selected item in either the popup menu or one of its submenus, or -1 if no item is selected (normally because the user presses Escape).

Note that all signals are emitted as usual. If you connect a menu item to a slot and call the menu's exec(), you get the result both via the signal-slot connection and in the return value of exec().

Common usage is to position the popup at the current mouse position: 

      exec(QCursor::pos());
or aligned to a widget: 
      exec(somewidget.mapToGlobal(QPoint(0,0)));

When positioning a popup with exec() or popup(), bear in mind that you cannot rely on the popup menu's current size(). For performance reasons, the popup adapts its size only when necessary. So in many cases, the size before and after the show is different. Instead, use sizeHint(). It calculates the proper size depending on the menu's current contents.

See also popup() and sizeHint.

void QPopupMenu::highlighted ( int id ) [signal]

This signal is emitted when a menu item is highlighted; id is the id of the highlighted item.

See also activated() and QMenuData::insertItem().

QIconSet * QMenuData::iconSet ( int id ) const

Returns the icon set that has been set for menu item id, or 0 if no icon set has been set.

See also changeItem(), text() and pixmap().

int QPopupMenu::idAt ( int index ) const

Returns the identifier of the menu item at position index in the internal list, or -1 if index is out of range.

See also QMenuData::setId() and QMenuData::indexOf().

Example: scrollview/scrollview.cpp.

int QPopupMenu::idAt ( const QPoint & pos ) const

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns the id of the item at pos, or -1 if there is no item there or if it is a separator item.

int QMenuData::insertItem ( const QString & text, const QObject * receiver, const char * member, const QKeySequence & accel = 0, int id = -1, int index = -1 )

The family of insertItem() functions inserts menu items into a popup menu or a menu bar.

A menu item is usually either a text string or a pixmap, both with an optional icon or keyboard accelerator. For special cases it is also possible to insert custom items (see QCustomMenuItem) or even widgets into popup menus.

Some insertItem() members take a popup menu as an additional argument. Use this to insert submenus to existing menus or pulldown menus to a menu bar.

The number of insert functions may look confusing, but they are actually quite simple to use.

This default version inserts a menu item with the text text, the accelerator key accel, an id and an optional index and connects it to the slot member in the object receiver.

Example: 

    QMenuBar   *mainMenu = new QMenuBar;
    QPopupMenu *fileMenu = new QPopupMenu;
    fileMenu->insertItem( "New",  myView, SLOT(newFile()), CTRL+Key_N );
    fileMenu->insertItem( "Open", myView, SLOT(open()),    CTRL+Key_O );
    mainMenu->insertItem( "File", fileMenu );

Not all insert functions take an object/slot parameter or an accelerator key. Use connectItem() and setAccel() on these items.

If you need to translate accelerators, use tr() with a string description that use pass to the QKeySequence constructor: 

    fileMenu->insertItem( tr("Open"), myView, SLOT(open()),
                         tr("Ctrl+O") );

In the example above, pressing Ctrl+N or selecting "Open" from the menu activates the myView->open() function.

Some insert functions take a QIconSet parameter to specify the little menu item icon. Note that you can always pass a QPixmap object instead.

The index specifies the position in the menu. The menu item is appended at the end of the list if index is negative.

Note that keyboard accelerators in Qt are not application-global, instead they are bound to a certain top-level window. For example, accelerators in QPopupMenu items only work for menus that are associated with a certain window. This is true for popup menus that live in a menu bar since their accelerators will then be installed in the menu bar itself. This also applies to stand-alone popup menus that have a top-level widget in their parentWidget() chain. The menu will then install its accelerator object on that top-level widget. For all other cases use an independent QAccel object.

Warning: Be careful when passing a literal 0 to insertItem() because some C++ compilers choose the wrong overloaded function. Cast the 0 to what you mean, e.g. (QObject*)0.

Returns the allocated menu identifier number (id if id >= 0).

See also removeItem(), changeItem(), setAccel(), connectItem(), QAccel and qnamespace.h.

Examples: addressbook/mainwindow.cpp, canvas/canvas.cpp, mdi/application.cpp, menu/menu.cpp, qwerty/qwerty.cpp, scrollview/scrollview.cpp and showimg/showimg.cpp.

int QMenuData::insertItem ( const QIconSet & icon, const QString & text, const QObject * receiver, const char * member, const QKeySequence & accel = 0, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a menu item with icon icon, text text, accelerator accel, optional id id, and optional index. The menu item is connected it to the receiver's member slot. The icon will be displayed to the left of the text in the item.

Returns the allocated menu identifier number (id if id >= 0).

See also removeItem(), changeItem(), setAccel(), connectItem(), QAccel and qnamespace.h.

int QMenuData::insertItem ( const QPixmap & pixmap, const QObject * receiver, const char * member, const QKeySequence & accel = 0, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a menu item with pixmap pixmap, accelerator accel, optional id id, and optional index. The menu item is connected it to the receiver's member slot. The icon will be displayed to the left of the text in the item.

To look best when being highlighted as a menu item, the pixmap should provide a mask (see QPixmap::mask()).

Returns the allocated menu identifier number (id if id >= 0).

See also removeItem(), changeItem(), setAccel() and connectItem().

int QMenuData::insertItem ( const QIconSet & icon, const QPixmap & pixmap, const QObject * receiver, const char * member, const QKeySequence & accel = 0, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a menu item with icon icon, pixmap pixmap, accelerator accel, optional id id, and optional index. The icon will be displayed to the left of the pixmap in the item. The item is connected to the member slot in the receiver object.

To look best when being highlighted as a menu item, the pixmap should provide a mask (see QPixmap::mask()).

Returns the allocated menu identifier number (id if id >= 0).

See also removeItem(), changeItem(), setAccel(), connectItem(), QAccel and qnamespace.h.

int QMenuData::insertItem ( const QString & text, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a menu item with text text, optional id id, and optional index.

Returns the allocated menu identifier number (id if id >= 0).

See also removeItem(), changeItem(), setAccel() and connectItem().

int QMenuData::insertItem ( const QIconSet & icon, const QString & text, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a menu item with icon icon, text text, optional id id, and optional index. The icon will be displayed to the left of the text in the item.

Returns the allocated menu identifier number (id if id >= 0).

See also removeItem(), changeItem(), setAccel() and connectItem().

int QMenuData::insertItem ( const QString & text, QPopupMenu * popup, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a menu item with text text, submenu popup, optional id id, and optional index.

The popup must be deleted by the programmer or by its parent widget. It is not deleted when this menu item is removed or when the menu is deleted.

Returns the allocated menu identifier number (id if id >= 0).

See also removeItem(), changeItem(), setAccel() and connectItem().

int QMenuData::insertItem ( const QIconSet & icon, const QString & text, QPopupMenu * popup, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a menu item with icon icon, text text, submenu popup, optional id id, and optional index. The icon will be displayed to the left of the text in the item.

The popup must be deleted by the programmer or by its parent widget. It is not deleted when this menu item is removed or when the menu is deleted.

Returns the allocated menu identifier number (id if id >= 0).

See also removeItem(), changeItem(), setAccel() and connectItem().

int QMenuData::insertItem ( const QPixmap & pixmap, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a menu item with pixmap pixmap, optional id id, and optional index.

To look best when being highlighted as a menu item, the pixmap should provide a mask (see QPixmap::mask()).

Returns the allocated menu identifier number (id if id >= 0).

See also removeItem(), changeItem(), setAccel() and connectItem().

int QMenuData::insertItem ( const QIconSet & icon, const QPixmap & pixmap, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a menu item with icon icon, pixmap pixmap, optional id id, and optional index. The icon will be displayed to the left of the pixmap in the item.

Returns the allocated menu identifier number (id if id >= 0).

See also removeItem(), changeItem(), setAccel() and connectItem().

int QMenuData::insertItem ( const QPixmap & pixmap, QPopupMenu * popup, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a menu item with pixmap pixmap, submenu popup, optional id id, and optional index.

The popup must be deleted by the programmer or by its parent widget. It is not deleted when this menu item is removed or when the menu is deleted.

Returns the allocated menu identifier number (id if id >= 0).

See also removeItem(), changeItem(), setAccel() and connectItem().

int QMenuData::insertItem ( const QIconSet & icon, const QPixmap & pixmap, QPopupMenu * popup, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a menu item with icon icon, pixmap pixmap submenu popup, optional id id, and optional index. The icon will be displayed to the left of the pixmap in the item.

The popup must be deleted by the programmer or by its parent widget. It is not deleted when this menu item is removed or when the menu is deleted.

Returns the allocated menu identifier number (id if id >= 0).

See also removeItem(), changeItem(), setAccel() and connectItem().

int QMenuData::insertItem ( QWidget * widget, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a menu item that consists of the widget widget with optional id id, and optional index.

Ownership of widget is transferred to the popup menu or to the menu bar.

Theoretically, any widget can be inserted into a popup menu. In practice, this only makes sense with certain widgets.

If a widget is not focus-enabled (see QWidget::isFocusEnabled()), the menu treats it as a separator; this means that the item is not selectable and will never get focus. In this way you can, for example, simply insert a QLabel if you need a popup menu with a title.

If the widget is focus-enabled it will get focus when the user traverses the popup menu with the arrow keys. If the widget does not accept ArrowUp and ArrowDown in its key event handler, the focus will move back to the menu when the respective arrow key is hit one more time. This works with a QLineEdit, for example. If the widget accepts the arrow key itself, it must also provide the possibility to put the focus back on the menu again by calling QWidget::focusNextPrevChild(). Futhermore, if the embedded widget closes the menu when the user made a selection, this can be done safely by calling 

    if ( isVisible() &&
         parentWidget() &&
         parentWidget()->inherits("QPopupMenu") )
        parentWidget()->close();

Returns the allocated menu identifier number (id if id >= 0).

See also removeItem().

int QMenuData::insertItem ( const QIconSet & icon, QCustomMenuItem * custom, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a custom menu item custom with an icon and with optional id id, and optional index.

This only works with popup menus. It is not supported for menu bars. Ownership of custom is transferred to the popup menu.

If you want to connect a custom item to a certain slot, use connectItem().

Returns the allocated menu identifier number (id if id >= 0).

See also connectItem(), removeItem() and QCustomMenuItem.

int QMenuData::insertItem ( QCustomMenuItem * custom, int id = -1, int index = -1 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts a custom menu item custom with optional id id, and optional index.

This only works with popup menus. It is not supported for menu bars. Ownership of custom is transferred to the popup menu.

If you want to connect a custom item to a certain slot, use connectItem().

Returns the allocated menu identifier number (id if id >= 0).

See also connectItem(), removeItem() and QCustomMenuItem.

int QMenuData::insertSeparator ( int index = -1 )

Inserts a separator at position index. The separator becomes the last menu item if index is negative.

In a popup menu a separator is rendered as a horizontal line. In a Motif menu bar a separator is spacing, so the rest of the items (normally just "Help") are drawn right-justified. In a Windows menu bar separators are ignored (to comply with the Windows style guidelines).

Examples: addressbook/mainwindow.cpp, mdi/application.cpp, menu/menu.cpp, progress/progress.cpp, scrollview/scrollview.cpp, showimg/showimg.cpp and sound/sound.cpp.

int QPopupMenu::insertTearOffHandle ( int id = -1, int index = -1 )

Inserts a tear-off handle into the menu. A tear-off handle is a special menu item that creates a copy of the menu when the menu is selected. This "torn-off" copy lives in a separate window. It contains the same menu items as the original menu, with the exception of the tear-off handle.

The handle item is assigned the identifier id or an automatically generated identifier if id is < 0. The generated identifiers (negative integers) are guaranteed to be unique within the entire application.

The index specifies the position in the menu. The tear-off handle is appended at the end of the list if index is negative.

Example: menu/menu.cpp.

bool QPopupMenu::isCheckable () const

Returns TRUE if the display of check marks on menu items is enabled; otherwise returns FALSE. See the "checkable" property for details.

bool QMenuData::isItemChecked ( int id ) const

Returns TRUE if the menu item with the id id has been checked; otherwise returns FALSE.

See also setItemChecked().

Examples: canvas/canvas.cpp, progress/progress.cpp and showimg/showimg.cpp.

bool QMenuData::isItemEnabled ( int id ) const

Returns TRUE if the item with identifier id is enabled; otherwise returns FALSE

See also setItemEnabled().

int QPopupMenu::itemHeight ( int row ) const [protected]

Calculates the height in pixels of the item in row row.

int QPopupMenu::itemHeight ( QMenuItem * mi ) const [protected]

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Calculates the height in pixels of the menu item mi.

int QMenuData::itemParameter ( int id ) const

Returns the parameter of the activation signal of item id.

If no parameter has been specified for this item with setItemParameter(), the value defaults to id.

See also connectItem(), disconnectItem() and setItemParameter().

QPixmap * QMenuData::pixmap ( int id ) const

Returns the pixmap that has been set for menu item id, or 0 if no pixmap has been set.

See also changeItem(), text() and iconSet().

void QPopupMenu::popup ( const QPoint & pos, int indexAtPoint = 0 )

Displays the popup menu so that the item number indexAtPoint will be at the specified global position pos. To translate a widget's local coordinates into global coordinates, use QWidget::mapToGlobal().

When positioning a popup with exec() or popup(), bear in mind that you cannot rely on the popup menu's current size(). For performance reasons, the popup adapts its size only when necessary, so in many cases, the size before and after the show is different. Instead, use sizeHint(). It calculates the proper size depending on the menu's current contents.

Examples: listviews/listviews.cpp and qtimage/qtimage.cpp.

void QMenuData::removeItem ( int id )

Removes the menu item that has the identifier id.

See also removeItemAt() and clear().

void QMenuData::removeItemAt ( int index )

Removes the menu item at position index.

See also removeItem() and clear().

void QMenuData::setAccel ( const QKeySequence & key, int id )

Sets the accelerator key for the menu item id to key.

An accelerator key consists of a key code and a combination of the modifiers SHIFT, CTRL, ALT or UNICODE_ACCEL (OR'ed or added). The header file qnamespace.h contains a list of key codes.

Defining an accelerator key produces a text that is added to the menu item; for instance, CTRL + Key_O produces "Ctrl+O". The text is formatted differently for different platforms.

Note that keyboard accelerators in Qt are not application-global, instead they are bound to a certain top-level window. For example, accelerators in QPopupMenu items only work for menus that are associated with a certain window. This is true for popup menus that live in a menu bar since their accelerators will then be installed in the menu bar itself. This also applies to stand-alone popup menus that have a top-level widget in their parentWidget() chain. The menu will then install its accelerator object on that top-level widget. For all other cases use an independent QAccel object.

Example: 

    QMenuBar *mainMenu = new QMenuBar;
    QPopupMenu *fileMenu = new QPopupMenu;       // file sub menu
    fileMenu->insertItem( "Open Document", 67 ); // add "Open" item
    fileMenu->setAccel( CTRL + Key_O, 67 );      // Control and O to open
    fileMenu->insertItem( "Quit", 69 );          // add "Quit" item
    fileMenu->setAccel( CTRL + ALT + Key_Delete, 69 );
    mainMenu->insertItem( "File", fileMenu );    // add the file menu

If you need to translate accelerators, use tr() with a string: 

    fileMenu->setAccel( tr("Ctrl+O"), 67 );

You can also specify the accelerator in the insertItem() function. You may prefer to use QAction to associate accelerators with menu items.

See also accel(), insertItem(), QAccel and QAction.

Example: menu/menu.cpp.

void QPopupMenu::setActiveItem ( int i ) [virtual]

Sets the currently active item to i and repaints as necessary.

void QPopupMenu::setCheckable ( bool ) [virtual]

Sets whether the display of check marks on menu items is enabled. See the "checkable" property for details.

void QMenuData::setItemChecked ( int id, bool check )

If check is TRUE, checks the menu item with id id; otherwise unchecks the menu item with id id. Calls QPopupMenu::setCheckable( TRUE ) if necessary.

See also isItemChecked().

Examples: canvas/canvas.cpp, grapher/grapher.cpp, mdi/application.cpp, menu/menu.cpp, progress/progress.cpp, scrollview/scrollview.cpp and showimg/showimg.cpp.

void QMenuData::setItemEnabled ( int id, bool enable )

If enable is TRUE, enables the menu item with identifier id; otherwise disables the menu item with identifier id.

See also isItemEnabled().

Examples: mdi/application.cpp, menu/menu.cpp, progress/progress.cpp and showimg/showimg.cpp.

bool QMenuData::setItemParameter ( int id, int param )

Sets the parameter of the activation signal of item id to param.

If any receiver takes an integer parameter, this value is passed.

See also connectItem(), disconnectItem() and itemParameter().

Example: mdi/application.cpp.

void QMenuData::setWhatsThis ( int id, const QString & text )

Sets text as What's This help for the menu item with identifier id.

See also whatsThis().

Examples: application/application.cpp and mdi/application.cpp.

QString QMenuData::text ( int id ) const

Returns the text that has been set for menu item id, or a null string if no text has been set.

See also changeItem(), pixmap() and iconSet().

Examples: qdir/qdir.cpp and showimg/showimg.cpp.

void QPopupMenu::updateItem ( int id ) [virtual]

Updates the item with identity id.

Reimplemented from QMenuData.

QString QMenuData::whatsThis ( int id ) const

Returns the What's This help text for the item with identifier id or QString::null if no text has yet been defined.

See also setWhatsThis().

Property Documentation

bool checkable

This property holds whether the display of check marks on menu items is enabled.

When TRUE, the display of check marks on menu items is enabled. Checking is always enabled when in Windows-style.

See also QMenuData::setItemChecked().

Set this property's value with setCheckable() and get this property's value with isCheckable().

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Copyright © 2002 TrolltechTrademarks
Qt version 3.0.4