The QAccel class handles keyboard accelerator and shortcut keys.
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A keyboard accelerator triggers an action when a certain key combination is pressed. The accelerator handles all keyboard activity for all the children of one top-level widget, so it is not affected by the keyboard focus.
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In most cases, you will not need to use this class directly. Use the QAction class to create actions with accelerators that can be used in both menus and toolbars. If you're only interested in menus use QMenuData::insertItem() or QMenuData::setAccel() to make accelerators for operations that are also available on menus. Many widgets automatically generate accelerators, such as QButton, QGroupBox, QLabel (with QLabel::setBuddy()), QMenuBar and QTabBar. Example:
A QAccel contains a list of accelerator items that can be manipulated using insertItem(), removeItem(), clear(), key() and findKey().
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Each accelerator item consists of an identifier and a QKeySequence. A single key sequence consists of a keyboard code combined with modifiers (SHIFT, CTRL, ALT or UNICODE_ACCEL). For example, \fCCTRL + Key_P\fR could be a shortcut for printing a document. The key codes are listed in qnamespace.h. As an alternative, use UNICODE_ACCEL with the unicode code point of the character. For example, \fCUNICODE_ACCEL + 'A'\fR gives the same accelerator as Key_A.
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When an accelerator key is pressed, the accelerator sends out the signal activated() with a number that identifies this particular accelerator item. Accelerator items can also be individually connected, so that two different keys will activate two different slots (see connectItem() and disconnectItem()).
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The activated() signal is \fInot\fR emitted when two or more accelerators match the same key. Instead, the first matching accelerator sends out the activatedAmbiguously() signal. By pressing the key multiple times, users can navigate between all matching accelerators. Some standard controls like QPushButton and QCheckBox connect the activatedAmbiguously() signal to the harmless setFocus() slot, whereas activated() is connected to a slot invoking the button's action. Most controls, like QLabel and QTabBar, treat activated() and activatedAmbiguously() as equivalent.
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Use setEnabled() to enable or disable all the items in an accelerator, or setItemEnabled() to enable or disable individual items. An item is active only when both the QAccel and the item itself are enabled.
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The function setWhatsThis() specifies a help text that appears when the user presses an accelerator key in What's This mode.
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The accelerator will be deleted when \fIparent\fR is deleted, and will consume relevant key events until then.
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Please note that the accelerator
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accelerator->insertItem( QKeySequence("M") );
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can be triggered with both the 'M' key, and with Shift+M, unless a second accelerator is defined for the Shift+M combination.
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Example:
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QAccel *a = new QAccel( myWindow ); // create accels for myWindow
Of course, you can also send a signal as \fImember\fR.
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Normally accelerators are connected to slots which then receive the \fCactivated(int id)\fR signal with the id of the accelerator item that was activated. If you choose to connect a specific accelerator item using this function, the activated() signal is emitted if the associated key sequence is pressed but no \fCactivated(int id)\fR signal is emitted.
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See also disconnectItem().
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Example: t14/gamebrd.cpp.
.SH "uint QAccel::count () const"
Returns the number of accelerator items in this accelerator.
.SH "bool QAccel::disconnectItem ( int id, const QObject * receiver, const char * member )"
Disconnects an accelerator item with id \fIid\fR from the function called \fImember\fR in the \fIreceiver\fR object.
a->insertItem( Key_D ); // gets a unique negative id < -1
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a->insertItem( CTRL + SHIFT + Key_P ); // gets a unique negative id < -1
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.fi
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Example: t14/gamebrd.cpp.
.SH "bool QAccel::isEnabled () const"
Returns TRUE if the accelerator is enabled; otherwise returns FALSE.
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See also setEnabled() and isItemEnabled().
.SH "bool QAccel::isItemEnabled ( int id ) const"
Returns TRUE if the accelerator item with the identifier \fIid\fR is enabled. Returns FALSE if the item is disabled or cannot be found.
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See also setItemEnabled() and isEnabled().
.SH "QKeySequence QAccel::key ( int id )"
Returns the key sequence of the accelerator item with identifier \fIid\fR, or an invalid key sequence (0) if the id cannot be found.
.SH "QString QAccel::keyToString ( QKeySequence k )\fC [static]\fR"
\fBThis function is obsolete.\fR It is provided to keep old source working. We strongly advise against using it in new code.
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Creates an accelerator string for the key \fIk\fR. For instance CTRL+Key_O gives "Ctrl+O". The "Ctrl" etc. are translated (using QObject::tr()) in the "QAccel" context.
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The function is superfluous. Cast the QKeySequence \fIk\fR to a QString for the same effect.
.SH "void QAccel::removeItem ( int id )"
Removes the accelerator item with the identifier \fIid\fR.
.SH "void QAccel::repairEventFilter ()"
\fBThis function is obsolete.\fR It is provided to keep old source working. We strongly advise against using it in new code. serves no purpose anymore
.SH "void QAccel::setEnabled ( bool enable )"
Enables the accelerator if \fIenable\fR is TRUE, or disables it if \fIenable\fR is FALSE.
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Individual keys can also be enabled or disabled using setItemEnabled(). To work, a key must be an enabled item in an enabled QAccel.
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See also isEnabled() and setItemEnabled().
.SH "void QAccel::setItemEnabled ( int id, bool enable )"
Enables the accelerator item with the identifier \fIid\fR if \fIenable\fR is TRUE, and disables item \fIid\fR if \fIenable\fR is FALSE.
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To work, an item must be enabled and be in an enabled QAccel.
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See also isItemEnabled() and isEnabled().
.SH "void QAccel::setWhatsThis ( int id, const QString & text )"
Sets a What's This help text for the accelerator item \fIid\fR to \fItext\fR.
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The text will be shown when the application is in What's This mode and the user hits the accelerator key.
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To set What's This help on a menu item (with or without an accelerator key), use QMenuData::setWhatsThis().
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See also whatsThis(), QWhatsThis::inWhatsThisMode(), QMenuData::setWhatsThis(), and QAction::whatsThis.
Returns the shortcut key sequence for \fIstr\fR, or an invalid key sequence (0) if \fIstr\fR has no shortcut sequence.
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For example, shortcutKey("E&xit") returns ALT+Key_X, shortcutKey("&Quit") returns ALT+Key_Q and shortcutKey("Quit") returns 0. (In code that does not inherit the Qt namespace class, you must write e.g. Qt::ALT+Qt::Key_Q.)
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We provide a list of common accelerators in English. At the time of writing, Microsoft and Open Group do not appear to have issued equivalent recommendations for other languages.
.SH "QKeySequence QAccel::stringToKey ( const QString & s )\fC [static]\fR"
\fBThis function is obsolete.\fR It is provided to keep old source working. We strongly advise against using it in new code.
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Returns an accelerator code for the string \fIs\fR. For example" Ctrl+O" gives CTRL+UNICODE_ACCEL+'O'. The strings "Ctrl"," Shift", "Alt" are recognized, as well as their translated equivalents in the "QAccel" context (using QObject::tr()). Returns 0 if \fIs\fR is not recognized.
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This function is typically used with tr(), so that accelerator keys can be replaced in translations:
