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220 lines
13 KiB
220 lines
13 KiB
14 years ago
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/widgets/qaction.cpp:1375 -->
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<title>QActionGroup Class</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QActionGroup Class Reference</h1>
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<p>The QActionGroup class groups actions together.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qaction-h.html">qaction.h</a>></tt>
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<p>Inherits <a href="qaction.html">QAction</a>.
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<p><a href="qactiongroup-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#QActionGroup"><b>QActionGroup</b></a> ( QObject * parent, const char * name = 0 )</li>
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<li class=fn><a href="#QActionGroup-2"><b>QActionGroup</b></a> ( QObject * parent, const char * name, bool exclusive )</li>
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<li class=fn><a href="#~QActionGroup"><b>~QActionGroup</b></a> ()</li>
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<li class=fn>void <a href="#setExclusive"><b>setExclusive</b></a> ( bool )</li>
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<li class=fn>bool <a href="#isExclusive"><b>isExclusive</b></a> () const</li>
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<li class=fn>void <a href="#add"><b>add</b></a> ( QAction * action )</li>
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<li class=fn>void <a href="#addSeparator"><b>addSeparator</b></a> ()</li>
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<li class=fn>virtual bool <a href="#addTo"><b>addTo</b></a> ( QWidget * w )</li>
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<li class=fn>void <a href="#setUsesDropDown"><b>setUsesDropDown</b></a> ( bool enable )</li>
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<li class=fn>bool <a href="#usesDropDown"><b>usesDropDown</b></a> () const</li>
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<li class=fn>void insert ( QAction * a ) <em>(obsolete)</em></li>
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</ul>
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<h2>Signals</h2>
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<ul>
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<li class=fn>void <a href="#selected"><b>selected</b></a> ( QAction * )</li>
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</ul>
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<h2>Properties</h2>
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<ul>
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<li class=fn>bool <a href="#exclusive-prop"><b>exclusive</b></a> - whether the action group does exclusive toggling</li>
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<li class=fn>bool <a href="#usesDropDown-prop"><b>usesDropDown</b></a> - whether the group's actions are displayed in a subwidget of the widgets the action group is added to</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QActionGroup class groups actions together.
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<p>
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<p> In some situations it is useful to group actions together. For
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example, if you have a left justify action, a right justify action
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and a center action, only one of these actions should be active at
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any one time, and one simple way of achieving this is to group the
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actions together in an action group.
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<p> An action group can also be added to a menu or a toolbar as a
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single unit, with all the actions within the action group
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appearing as separate menu options and toolbar buttons.
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<p> Here's an example from examples/textedit:
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<pre> QActionGroup *grp = new QActionGroup( this );
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<a name="x2112"></a> <a href="qobject.html#connect">connect</a>( grp, SIGNAL( <a href="#selected">selected</a>( <a href="qaction.html">QAction</a>* ) ), this, SLOT( textAlign( <a href="qaction.html">QAction</a>* ) ) );
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</pre>
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<p> Here we create a new action group. Since the action group is exclusive
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by default, only one of the actions in the group is ever active at any
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one time. We then connect the group's <a href="#selected">selected</a>() signal to our
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textAlign() slot.
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<p> <pre> <a name="x2113"></a> actionAlignLeft = new <a href="qaction.html">QAction</a>( QPixmap::<a href="qpixmap.html#fromMimeSource">fromMimeSource</a>( "textleft.xpm" ), tr( "&Left" ), CTRL + Key_L, grp, "textLeft" );
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<a name="x2111"></a> actionAlignLeft-><a href="qaction.html#setToggleAction">setToggleAction</a>( TRUE );
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</pre>
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<p> We create a left align action, add it to the toolbar and the menu
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and make it a toggle action. We create center and right align
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actions in exactly the same way.
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<p>
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The actions in an action group emit their <a href="qaction.html#activated">activated</a>() (and for
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toggle actions, <a href="qaction.html#toggled">toggled</a>()) signals as usual.
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<p> The <a href="#setExclusive">setExclusive</a>() function is used to ensure that only one action
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is active at any one time: it should be used with actions which
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have their <a href="qaction.html#toggleAction-prop">toggleAction</a> set to TRUE.
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<p> Action group actions appear as individual menu options and toolbar
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buttons. For exclusive action groups use <a href="#setUsesDropDown">setUsesDropDown</a>() to
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display the actions in a subwidget of any widget the action group
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is added to. For example, the actions would appear in a combobox
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in a toolbar or as a submenu in a menu.
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<p> Actions can be added to an action group using <a href="#add">add</a>(), but normally
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they are added by creating the action with the action group as
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parent. Actions can have separators dividing them using
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<a href="#addSeparator">addSeparator</a>(). Action groups are added to widgets with <a href="#addTo">addTo</a>().
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<p>See also <a href="application.html">Main Window and Related Classes</a> and <a href="basic.html">Basic Widgets</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QActionGroup"></a>QActionGroup::QActionGroup ( <a href="qobject.html">QObject</a> * parent, const char * name = 0 )
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</h3>
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Constructs an action group called <em>name</em>, with parent <em>parent</em>.
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<p> The action group is exclusive by default. Call <a href="#setExclusive">setExclusive</a>(FALSE) to make
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the action group non-exclusive.
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<h3 class=fn><a name="QActionGroup-2"></a>QActionGroup::QActionGroup ( <a href="qobject.html">QObject</a> * parent, const char * name, bool exclusive )
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</h3>
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Constructs an action group called <em>name</em>, with parent <em>parent</em>.
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<p> If <em>exclusive</em> is TRUE only one toggle action in the group will
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ever be active.
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<p> <p>See also <a href="#exclusive-prop">exclusive</a>.
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<h3 class=fn><a name="~QActionGroup"></a>QActionGroup::~QActionGroup ()
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</h3>
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Destroys the object and frees allocated resources.
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<h3 class=fn>void <a name="add"></a>QActionGroup::add ( <a href="qaction.html">QAction</a> * action )
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</h3>
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Adds action <em>action</em> to this group.
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<p> Normally an action is added to a group by creating it with the
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group as parent, so this function is not usually used.
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<p> <p>See also <a href="#addTo">addTo</a>().
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<h3 class=fn>void <a name="addSeparator"></a>QActionGroup::addSeparator ()
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</h3>
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Adds a separator to the group.
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<h3 class=fn>bool <a name="addTo"></a>QActionGroup::addTo ( <a href="qwidget.html">QWidget</a> * w )<tt> [virtual]</tt>
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</h3>
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Adds this action group to the widget <em>w</em>.
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<p> If <a href="#isExclusive">isExclusive</a>() is FALSE or <a href="#usesDropDown">usesDropDown</a>() is FALSE, the actions within
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the group are added to the widget individually. For example, if the widget
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is a menu, the actions will appear as individual menu options, and
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if the widget is a toolbar, the actions will appear as toolbar buttons.
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<p> If both isExclusive() and usesDropDown() are TRUE, the actions
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are presented either in a combobox (if <em>w</em> is a toolbar) or in a
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submenu (if <em>w</em> is a menu).
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<p> All actions should be added to the action group <em>before</em> the
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action group is added to the widget. If actions are added to the
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action group <em>after</em> the action group has been added to the
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widget these later actions will <em>not</em> appear.
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<p> <p>See also <a href="#exclusive-prop">exclusive</a>, <a href="#usesDropDown-prop">usesDropDown</a>, and <a href="qaction.html#removeFrom">removeFrom</a>().
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<p>Example: <a href="themes-example.html#x318">themes/themes.cpp</a>.
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<p>Reimplemented from <a href="qaction.html#addTo">QAction</a>.
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<h3 class=fn>void <a name="insert"></a>QActionGroup::insert ( <a href="qaction.html">QAction</a> * a )
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</h3>
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<p> <b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
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<p> Use <a href="#add">add</a>() instead, or better still create the action with the action
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group as its parent.
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<h3 class=fn>bool <a name="isExclusive"></a>QActionGroup::isExclusive () const
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</h3><p>Returns TRUE if the action group does exclusive toggling; otherwise returns FALSE.
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See the <a href="qactiongroup.html#exclusive-prop">"exclusive"</a> property for details.
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<h3 class=fn>void <a name="selected"></a>QActionGroup::selected ( <a href="qaction.html">QAction</a> * )<tt> [signal]</tt>
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</h3>
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<p> This signal is emitted from exclusive groups when toggle actions
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change state.
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<p> The argument is the action whose state changed to "on".
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<p> <p>See also <a href="#exclusive-prop">exclusive</a>, <a href="qaction.html#on-prop">on</a>, and <a href="qaction.html#toggled">QAction::toggled</a>().
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<p>Examples: <a href="canvas-chart-example.html#x2873">chart/chartform.cpp</a> and <a href="qactiongroup.html#x2112">textedit/textedit.cpp</a>.
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<h3 class=fn>void <a name="setExclusive"></a>QActionGroup::setExclusive ( bool )
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</h3><p>Sets whether the action group does exclusive toggling.
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See the <a href="qactiongroup.html#exclusive-prop">"exclusive"</a> property for details.
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<h3 class=fn>void <a name="setUsesDropDown"></a>QActionGroup::setUsesDropDown ( bool enable )
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</h3><p>Sets whether the group's actions are displayed in a subwidget of the widgets the action group is added to to <em>enable</em>.
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See the <a href="qactiongroup.html#usesDropDown-prop">"usesDropDown"</a> property for details.
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<h3 class=fn>bool <a name="usesDropDown"></a>QActionGroup::usesDropDown () const
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</h3><p>Returns TRUE if the group's actions are displayed in a subwidget of the widgets the action group is added to; otherwise returns FALSE.
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See the <a href="qactiongroup.html#usesDropDown-prop">"usesDropDown"</a> property for details.
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<hr><h2>Property Documentation</h2>
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<h3 class=fn>bool <a name="exclusive-prop"></a>exclusive</h3>
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<p>This property holds whether the action group does exclusive toggling.
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<p>If exclusive is TRUE only one toggle action in the action group
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can ever be active at any one time. If the user chooses another
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toggle action in the group the one they chose becomes active and
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the one that was active becomes inactive.
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<p> <p>See also <a href="qaction.html#toggleAction-prop">QAction::toggleAction</a>.
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<p>Set this property's value with <a href="#setExclusive">setExclusive</a>() and get this property's value with <a href="#isExclusive">isExclusive</a>().
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<h3 class=fn>bool <a name="usesDropDown-prop"></a>usesDropDown</h3>
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<p>This property holds whether the group's actions are displayed in a subwidget of the widgets the action group is added to.
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<p>Exclusive action groups added to a toolbar display their actions
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in a combobox with the action's <a href="qaction.html#text-prop">QAction::text</a> and <a href="qaction.html#iconSet-prop">QAction::iconSet</a> properties shown. Non-exclusive groups are
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represented by a tool button showing their <a href="qaction.html#iconSet-prop">QAction::iconSet</a> and
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-- depending on <a href="qmainwindow.html#usesTextLabel">QMainWindow::usesTextLabel</a>() -- <a href="qaction.html#text">text</a>()
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property.
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<p> In a popup menu the member actions are displayed in a submenu.
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<p> Changing usesDropDown only affects <em>subsequent</em> calls to <a href="#addTo">addTo</a>().
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<p> Note that setting this property for actions in a combobox causes
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calls to their <a href="qaction.html#setVisible">QAction::setVisible</a>(),
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<a href="qaction.html#setEnabled">QAction::setEnabled</a>(), and
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<a href="qaction.html#setDisabled">QAction::setDisabled</a>() functions to have no effect.
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<p> This property's default is FALSE.
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<p>
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<p>Set this property's value with <a href="#setUsesDropDown">setUsesDropDown</a>() and get this property's value with <a href="#usesDropDown">usesDropDown</a>().
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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