QPopupMenu(3qt)QPopupMenu(3qt)NAMEQPopupMenu - Popup menu widget
#include <qpopupmenu.h>
Inherits QFrame and QMenuData.
Public Members
QPopupMenu ( QWidget * parent=0, const char * name=0 )
~QPopupMenu ()
void popup ( const QPoint & pos, int indexAtPoint = 0 )
virtual void updateItem ( int id )
virtual void setCheckable ( bool )
bool isCheckable () const
int exec ()
int exec ( const QPoint & pos, int indexAtPoint = 0 )
virtual void setActiveItem ( int )
int idAt ( int index ) const
int idAt ( const QPoint & pos ) const
int insertTearOffHandle ( int id=-1, int index=-1 )
Signals
void activated ( int itemId )
void highlighted ( int itemId )
void activatedRedirect ( int itemId ) (internal)
void highlightedRedirect ( int itemId ) (internal)
void aboutToShow ()
void aboutToHide ()
Important Inherited Members
int insertItem ( QCustomMenuItem * custom, int id, int
index )
int insertItem ( QWidget * widget, int id, int index )
int insertItem ( const QIconSet & icon, QCustomMenuItem *
custom, int id, int index )
int insertItem ( const QIconSet & icon, const QPixmap &
pixmap, QPopupMenu * popup, int id, int index )
int insertItem ( const QIconSet & icon, const QPixmap &
pixmap, const QObject * receiver, const char * member,
int accel, int id, int index )
int insertItem ( const QIconSet & icon, const QPixmap &
pixmap, int id, int index )
int insertItem ( const QIconSet & icon, const QString &
text, QPopupMenu * popup, int id, int index )
int insertItem ( const QIconSet & icon, const QString &
text, const QObject * receiver, const char * member,
int accel, int id, int index )
int insertItem ( const QIconSet & icon, const QString &
text, int id, int index )
int insertItem ( const QPixmap & pixmap, QPopupMenu *
popup, int id, int index )
int insertItem ( const QPixmap & pixmap, const QObject *
receiver, const char * member, int accel, int id, int
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QPopupMenu(3qt)QPopupMenu(3qt)
index )
int insertItem ( const QPixmap & pixmap, int id, int index
)
int insertItem ( const QString & text, QPopupMenu * popup,
int id, int index )
int insertItem ( const QString & text, const QObject *
receiver, const char * member, int accel, int id, int
index )
int insertItem ( const QString & text, int id, int index )
void removeItem ( int id )
void removeItemAt ( int index )
void clear ()
QString text ( int id ) const
QPixmap* pixmap ( int id ) const
QIconSet* iconSet ( int id ) const
int insertSeparator ( int index )
void changeItem ( int id, const QIconSet & icon, const
QPixmap & pixmap )
void changeItem ( int id, const QIconSet & icon, const
QString & text )
void changeItem ( int id, const QPixmap & pixmap )
void changeItem ( int id, const QString & text )
QString whatsThis ( int id ) const
void setWhatsThis ( int id, const QString & text )
int accel ( int id ) const
void setAccel ( int key, int id )
void setItemEnabled ( int id, bool enable )
bool isItemEnabled ( int id ) const
void setItemChecked ( int id, bool check )
bool isItemChecked ( int id ) const
bool connectItem ( int id, const QObject * receiver, const
char * member )
bool disconnectItem ( int id, const QObject * receiver,
const char * member )
bool setItemParameter ( int id, int param )
int itemParameter ( int id ) const
Protected Members
int itemHeight ( int ) const
int itemHeight ( QMenuItem * mi ) const
void drawItem ( QPainter * p, int tab, QMenuItem * mi,
bool act, int x, int y, int w, int h )
virtual void drawContents ( QPainter * )
int columns () const
Properties
l l l l l
- - - - -
l l l l l.
Type Name READ WRITE Options
bool checkable isCheckable setCheckable
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QPopupMenu(3qt)QPopupMenu(3qt)DESCRIPTION
The QPopupMenu class provides a popup menu widget.
A popup menu widget is a selection menu. It can be both, a
pull-down menu in a menu bar or a standalone context 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, like "Ctrl-X".
There are three kind of menu items: separators, those that
perform an action and those 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 actions items, you usually specify a
receiver and a slot. The receiver will be notified
whenever the item was selected. In addition, QPopupMenu
provides two signals activated() and highlighted() that
signal the identifier of the respective menu item.
Sometimes it is 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 light-weight online help.
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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" torn off" copy of a menu that lives in a
separate window. 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(). When using tear-off menus,
keep in mind that the concept isn't typically used on MS-
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.
[Image Omitted]
[Image Omitted]
See also QMenuBar and GUI Design Handbook: Menu, Drop-Down
and Pop-Up
Examples: qtimage/qtimage.cpp grapher/grapher.cpp
mainlyQt/editor.cpp layout/layout.cpp menu/menu.cpp
progress/progress.cpp scrollview/scrollview.cpp
MEMBER FUNCTION DOCUMENTATIONQPopupMenu::QPopupMenu ( QWidget * parent=0, const char * name=0
)
Constructs a popup menu with a parent and a widget name.
Although a popup menu is always a top level widget, if a
parent is passed, the popup menu will be deleted on
destruction of that parent (as with any other QObject).
QPopupMenu::~QPopupMenu ()
Destructs the popup menu.
void QPopupMenu::aboutToHide () [signal]
This signal is emitted just before the popup menu is
hidden after it has been displayed.
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).
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See also aboutToHide(), setItemEnabled(),
setItemChecked(), insertItem() and removeItem().
void QPopupMenu::activateItemAt ( int index )
Reimplemented for internal reasons; the API is not
affected.
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 will 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 handy in
such cases.
See also highlighted() and QMenuData::insertItem().
void QPopupMenu::closeEvent ( QCloseEvent * e ) [virtual
protected]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QWidget.
int QPopupMenu::columns () const [protected]
If a popup menu does not fit on the screen, it layouts
itself in multiple columns until it fits.
This functions returns in how many.
See also sizeHint().
bool QPopupMenu::customWhatsThis () const [virtual]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QWidget.
void QPopupMenu::drawContents ( QPainter * p ) [virtual
protected]
Draws all menu items.
Reimplemented from QFrame.
void QPopupMenu::drawItem ( QPainter * p, int tab_, QMenuItem *
mi, bool act, int x, int y, int w, int h ) [protected]
Draws item mi in the area x, y, w, h, using painter p. The
item is drawn active or inactive according to act, and
using the rightmost tab_ pixels for accelerator text.
See also QStyle::drawPopupMenuItem().
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QPopupMenu(3qt)QPopupMenu(3qt)int QPopupMenu::exec ()
Execute this popup synchronously.
Similar to the above function, but the position of the
popup is not set, so you must choose an appropriate
position. The function move the popup if it is partially
off-screen.
More 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)));
int QPopupMenu::exec ( const QPoint & pos, int indexAtPoint = 0 )
Execute 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(), keep in
mind that you cannot rely on the popup menu's current
size(). For performance reasons, the popup adapts its size
only when actually needed. 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().
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QPopupMenu(3qt)QPopupMenu(3qt)void QPopupMenu::focusInEvent ( QFocusEvent * ) [virtual
protected]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QWidget.
bool QPopupMenu::focusNextPrevChild ( bool next ) [virtual
protected]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QWidget.
void QPopupMenu::focusOutEvent ( QFocusEvent * ) [virtual
protected]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QWidget.
void QPopupMenu::hide () [virtual]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QWidget.
void QPopupMenu::highlighted ( int id ) [signal]
This signal is emitted when a menu item is highlighted; id
is the id of the highlighted item.
Normally, you will 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 handy in
such cases.
See also activated() and QMenuData::insertItem().
int QPopupMenu::idAt ( const QPoint & pos ) const
Return the id of the item at pos, or -1 if there is no
item there, or if it is a separator item.
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().
Examples: scrollview/scrollview.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 - when selected - creates a
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copy of the menu. This "torn off" copy lives in a separate
window. It contains the same choices as the original menu,
with the exception of the tear-off handle.
You may also want to set a proper window title for the
tear-off menu with setCaption().
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.
Examples: menu/menu.cpp
bool QPopupMenu::isCheckable () const
Returns whether display of check marks by the menu items
is enabled.
See also setCheckable() and QMenuData::setItemChecked().
int QPopupMenu::itemHeight ( QMenuItem * mi ) const [protected]
Calculates the height in pixels of the item mi.
int QPopupMenu::itemHeight ( int row ) const [protected]
Calculates the height in pixels of the item in row row.
void QPopupMenu::keyPressEvent ( QKeyEvent * e ) [virtual
protected]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QWidget.
void QPopupMenu::mouseMoveEvent ( QMouseEvent * e ) [virtual
protected]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QWidget.
void QPopupMenu::mousePressEvent ( QMouseEvent * e ) [virtual
protected]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QWidget.
void QPopupMenu::mouseReleaseEvent ( QMouseEvent * e ) [virtual
protected]
Reimplemented for internal reasons; the API is not
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affected.
Reimplemented from QWidget.
void QPopupMenu::paintEvent ( QPaintEvent * e ) [virtual
protected]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QWidget.
void QPopupMenu::popup ( const QPoint & pos, int indexAtPoint = 0
)
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().
When positioning a popup with exec() or popup(), keep in
mind that you cannot rely on the popup menu's current
size(). For performance reasons, the popup adapts its size
only when actually needed. 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: qtimage/qtimage.cpp
void QPopupMenu::setActiveItem ( int i ) [virtual]
Sets the currently active item to i and repaints as
necessary.
void QPopupMenu::setCheckable ( bool enable ) [virtual]
Enables or disables display of check marks by the menu
items.
Notice that checking is always enabled when in windows-
style.
See also isCheckable() and QMenuData::setItemChecked().
Examples: grapher/grapher.cpp menu/menu.cpp
progress/progress.cpp scrollview/scrollview.cpp
void QPopupMenu::setFont ( const QFont & font ) [virtual]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QWidget.
void QPopupMenu::show () [virtual]
Reimplemented for internal reasons; the API is not
affected.
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Reimplemented from QWidget.
QSize QPopupMenu::sizeHint () const [virtual]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QWidget.
void QPopupMenu::styleChange ( QStyle & old ) [virtual protected]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QWidget.
void QPopupMenu::timerEvent ( QTimerEvent * e ) [virtual
protected]
Reimplemented for internal reasons; the API is not
affected.
Reimplemented from QObject.
void QPopupMenu::updateItem ( int id ) [virtual]
Updates the item with identity id.
Reimplemented from QMenuData.
void QPopupMenu::activatedRedirect ( int id ) [signal]
For internal use only.
void QPopupMenu::highlightedRedirect ( int id ) [signal]
For internal use only.
SEE ALSO
http://doc.trolltech.com/qpopupmenu.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2001 Trolltech AS,
http://www.trolltech.com. See the license file included
in the distribution for a complete license statement.
AUTHOR
Generated automatically from the source code.
BUGS
If you find a bug in Qt, please report it as described in
http://doc.trolltech.com/bughowto.html. Good bug reports
make our job much simpler. Thank you.
In case of content or formattting problems with this
manual page, please report them to qt-bugs@trolltech.com.
Please include the name of the manual page
(qpopupmenu.3qt) and the Qt version (2.3.1).
Trolltech AS 13 June 2001 10
