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138 lines
6.7 KiB
138 lines
6.7 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/widgets/qmenudata.cpp:1461 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QCustomMenuItem Class</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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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>QCustomMenuItem Class Reference</h1>
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<p>The QCustomMenuItem class is an abstract base class for custom menu items in popup menus.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qmenudata-h.html">qmenudata.h</a>></tt>
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<p>Inherits <a href="qt.html">Qt</a>.
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<p><a href="qcustommenuitem-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="#QCustomMenuItem"><b>QCustomMenuItem</b></a> ()</li>
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<li class=fn>virtual <a href="#~QCustomMenuItem"><b>~QCustomMenuItem</b></a> ()</li>
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<li class=fn>virtual bool <a href="#fullSpan"><b>fullSpan</b></a> () const</li>
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<li class=fn>virtual bool <a href="#isSeparator"><b>isSeparator</b></a> () const</li>
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<li class=fn>virtual void <a href="#setFont"><b>setFont</b></a> ( const QFont & font )</li>
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<li class=fn>virtual void <a href="#paint"><b>paint</b></a> ( QPainter * p, const QColorGroup & cg, bool act, bool enabled, int x, int y, int w, int h ) = 0</li>
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<li class=fn>virtual QSize <a href="#sizeHint"><b>sizeHint</b></a> () = 0</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QCustomMenuItem class is an abstract base class for custom menu items in popup menus.
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<p>
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<p> A custom menu item is a menu item that is defined by two pure
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virtual functions, <a href="#paint">paint</a>() and <a href="#sizeHint">sizeHint</a>(). The size hint tells the
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menu how much space it needs to reserve for this item, and paint
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is called whenever the item needs painting.
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<p> This simple mechanism allows you to create all kinds of
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application specific menu items. Examples are items showing
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different fonts in a word processor or menus that allow the
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selection of drawing utilities in a vector drawing program.
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<p> A custom item is inserted into a popup menu with
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<a href="qmenudata.html#insertItem">QPopupMenu::insertItem</a>().
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<p> By default, a custom item can also have an icon and a keyboard
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accelerator. You can reimplement <a href="#fullSpan">fullSpan</a>() to return TRUE if you
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want the item to span the entire popup menu width. This is
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particularly useful for labels.
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<p> If you want the custom item to be treated just as a separator,
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reimplement <a href="#isSeparator">isSeparator</a>() to return TRUE.
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<p> Note that you can insert pixmaps or bitmaps as items into a popup
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menu without needing to create a QCustomMenuItem. However, custom
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menu items offer more flexibility, and -- especially important
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with Windows style -- provide the possibility of drawing the item
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with a different color when it is highlighted.
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<p> <a href="menu-example.html">menu/menu.cpp</a> shows a simple
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example how custom menu items can be used.
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<p> Note: the current implementation of QCustomMenuItem will not
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recognize shortcut keys that are from text with ampersands. Normal
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accelerators work though.
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<p> <img src=qpopmenu-fancy.png>
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<p> <p>See also <a href="qmenudata.html">QMenuData</a>, <a href="qpopupmenu.html">QPopupMenu</a>, and <a href="misc.html">Miscellaneous Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QCustomMenuItem"></a>QCustomMenuItem::QCustomMenuItem ()
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</h3>
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Constructs a QCustomMenuItem
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<h3 class=fn><a name="~QCustomMenuItem"></a>QCustomMenuItem::~QCustomMenuItem ()<tt> [virtual]</tt>
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</h3>
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Destroys a QCustomMenuItem
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<h3 class=fn>bool <a name="fullSpan"></a>QCustomMenuItem::fullSpan () const<tt> [virtual]</tt>
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</h3>
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Returns TRUE if this item wants to span the entire popup menu
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width; otherwise returns FALSE. The default is FALSE, meaning that
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the menu may show an icon and an accelerator key for this item as
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well.
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<h3 class=fn>bool <a name="isSeparator"></a>QCustomMenuItem::isSeparator () const<tt> [virtual]</tt>
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</h3>
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Returns TRUE if this item is just a separator; otherwise returns
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FALSE.
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<h3 class=fn>void <a name="paint"></a>QCustomMenuItem::paint ( <a href="qpainter.html">QPainter</a> * p, const <a href="qcolorgroup.html">QColorGroup</a> & cg, bool act, bool enabled, int x, int y, int w, int h )<tt> [pure virtual]</tt>
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</h3>
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<p> Paints this item. When this function is invoked, the painter <em>p</em>
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is set to a font and foreground color suitable for a menu item
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text using color group <em>cg</em>. The item is active if <em>act</em> is TRUE
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and enabled if <em>enabled</em> is TRUE. The geometry values <em>x</em>, <em>y</em>,
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<em>w</em> and <em>h</em> specify where to draw the item.
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<p> Do not draw any background, this has already been done by the
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popup menu according to the current GUI style.
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<h3 class=fn>void <a name="setFont"></a>QCustomMenuItem::setFont ( const <a href="qfont.html">QFont</a> & font )<tt> [virtual]</tt>
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</h3>
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Sets the font of the custom menu item to <em>font</em>.
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<p> This function is called whenever the font in the popup menu
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changes. For menu items that show their own individual font entry,
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you want to ignore this.
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<h3 class=fn><a href="qsize.html">QSize</a> <a name="sizeHint"></a>QCustomMenuItem::sizeHint ()<tt> [pure virtual]</tt>
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</h3>
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<p> Returns the item's size hint.
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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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