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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>TQWhatsThis Class Reference</h1>
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<p>The TQWhatsThis class provides a simple description of any
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widget, i.e. answering the question "What's this?".
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qwhatsthis-h.html">ntqwhatsthis.h</a>></tt>
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<p>Inherits <a href="ntqt.html">TQt</a>.
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<p><a href="qwhatsthis-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="#TQWhatsThis"><b>TQWhatsThis</b></a> ( TQWidget * widget )</li>
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<li class=fn>virtual <a href="#~TQWhatsThis"><b>~TQWhatsThis</b></a> ()</li>
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<li class=fn>virtual TQString <a href="#text"><b>text</b></a> ( const TQPoint & )</li>
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<li class=fn>virtual bool <a href="#clicked"><b>clicked</b></a> ( const TQString & href )</li>
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</ul>
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<h2>Static Public Members</h2>
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<ul>
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<li class=fn>void <a href="#setFont"><b>setFont</b></a> ( const TQFont & font )</li>
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<li class=fn>void <a href="#add"><b>add</b></a> ( TQWidget * widget, const TQString & text )</li>
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<li class=fn>void <a href="#remove"><b>remove</b></a> ( TQWidget * widget )</li>
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<li class=fn>TQString <a href="#textFor"><b>textFor</b></a> ( TQWidget * w, const TQPoint & pos = TQPoint ( ), bool includeParents = FALSE )</li>
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<li class=fn>TQToolButton * <a href="#whatsThisButton"><b>whatsThisButton</b></a> ( TQWidget * parent )</li>
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<li class=fn>void <a href="#enterWhatsThisMode"><b>enterWhatsThisMode</b></a> ()</li>
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<li class=fn>bool <a href="#inWhatsThisMode"><b>inWhatsThisMode</b></a> ()</li>
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<li class=fn>void <a href="#leaveWhatsThisMode"><b>leaveWhatsThisMode</b></a> ( const TQString & text = TQString::null, const TQPoint & pos = TQCursor::pos ( ), TQWidget * w = 0 )</li>
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<li class=fn>void <a href="#display"><b>display</b></a> ( const TQString & text, const TQPoint & pos = TQCursor::pos ( ), TQWidget * w = 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 TQWhatsThis class provides a simple description of any
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widget, i.e. answering the question "What's this?".
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<p>
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<p> "What's this?" help is part of an application's online <a href="helpsystem.html#help-system">help system</a>
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that provides users with information about functionality, usage,
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background etc., in various levels of detail from short tool tips
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to full text browsing help windows.
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<p> TQWhatsThis provides a single window with an explanatory text that
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pops up when the user asks "What's this?". The default way to do
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this is to focus the relevant widget and press Shift+F1. The help
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text appears immediately; it goes away as soon as the user does
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something else.
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<p> (Note that if there is an accelerator for Shift+F1, this mechanism
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will not work.)
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<p> To add "What's this?" text to a widget you simply call
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<a href="#add">TQWhatsThis::add</a>() for the widget. For example, to assign text to a
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menu item, call <a href="ntqmenudata.html#setWhatsThis">TQMenuData::setWhatsThis</a>(); for a global
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accelerator key, call <a href="ntqaccel.html#setWhatsThis">TQAccel::setWhatsThis</a>() and If you're using
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actions, use <a href="ntqaction.html#setWhatsThis">TQAction::setWhatsThis</a>().
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<p> The text can be either rich text or plain text. If you specify a
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rich text formatted string, it will be rendered using the default
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stylesheet. This makes it possible to embed images. See
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<a href="ntqstylesheet.html#defaultSheet">TQStyleSheet::defaultSheet</a>() for details.
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<p>
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<pre> const char * fileOpenText = "<p><img source=\"fileopen\"> "
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"Click this button to open a <em>new file</em>. <br>"
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"You can also select the <b>Open</b> command "
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"from the <b>File</b> menu.</p>";
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<a name="x2104"></a> TQMimeSourceFactory::<a href="qmimesourcefactory.html#defaultFactory">defaultFactory</a>()->setPixmap( "document-open",
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<a name="x2102"></a> fileOpenAction-><a href="ntqaction.html#iconSet">iconSet</a>().pixmap() );
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<a name="x2103"></a> fileOpenAction-><a href="ntqaction.html#setWhatsThis">setWhatsThis</a>( fileOpenText );
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</pre>
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<p> An alternative way to enter "What's this?" mode is to use the
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ready-made tool bar tool button from
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<a href="#whatsThisButton">TQWhatsThis::whatsThisButton</a>(). By invoking this context help
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button (in the picture below the first one from the right) the
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user switches into "What's this?" mode. If they now click on a
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widget the appropriate help text is shown. The mode is left when
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help is given or when the user presses Esc.
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<p> <center><img src="whatsthis.png"></center>
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<p> If you are using <a href="ntqmainwindow.html">TQMainWindow</a> you can also use the
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<a href="ntqmainwindow.html#whatsThis">TQMainWindow::whatsThis</a>() slot to invoke the mode from a menu item.
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<p> For more control you can create a dedicated TQWhatsThis object for
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a special widget. By subclassing and reimplementing
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<a href="#text">TQWhatsThis::text</a>() it is possible to have different help texts,
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depending on the position of the mouse click. By reimplementing
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<a href="#clicked">TQWhatsThis::clicked</a>() it is possible to have hyperlinks inside the
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help texts.
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<p> If you wish to control the "What's this?" behavior of a widget
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manually see <a href="ntqwidget.html#customWhatsThis">TQWidget::customWhatsThis</a>().
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<p> The What's This object can be removed using <a href="#remove">TQWhatsThis::remove</a>(),
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although this is rarely necessary because it is automatically
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removed when the widget is destroyed.
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<p> <p>See also <a href="ntqtooltip.html">TQToolTip</a> and <a href="helpsystem.html">Help System</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQWhatsThis"></a>TQWhatsThis::TQWhatsThis ( <a href="ntqwidget.html">TQWidget</a> * widget )
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</h3>
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Constructs a dynamic "What's this?" object for <em>widget</em>. The
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object is deleted when the <em>widget</em> is destroyed.
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<p> When the widget is queried by the user the <a href="#text">text</a>() function of this
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TQWhatsThis will be called to provide the appropriate text, rather
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than using the text assigned by <a href="#add">add</a>().
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<h3 class=fn><a name="~TQWhatsThis"></a>TQWhatsThis::~TQWhatsThis ()<tt> [virtual]</tt>
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</h3>
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Destroys the object and frees any allocated resources.
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<h3 class=fn>void <a name="add"></a>TQWhatsThis::add ( <a href="ntqwidget.html">TQWidget</a> * widget, const <a href="ntqstring.html">TQString</a> & text )<tt> [static]</tt>
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</h3>
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Adds <em>text</em> as "What's this" help for <em>widget</em>. If the text is
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rich text formatted (i.e. it contains markup) it will be rendered
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with the default stylesheet <a href="ntqstylesheet.html#defaultSheet">TQStyleSheet::defaultSheet</a>().
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<p> The text is destroyed if the widget is later destroyed, so it need
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not be explicitly removed.
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<p> <p>See also <a href="#remove">remove</a>().
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<p>Examples: <a href="simple-application-example.html#x1591">application/application.cpp</a>, <a href="helpsystem-example.html#x2698">helpsystem/mainwindow.cpp</a>, and <a href="mdi-example.html#x2075">mdi/application.cpp</a>.
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<h3 class=fn>bool <a name="clicked"></a>TQWhatsThis::clicked ( const <a href="ntqstring.html">TQString</a> & href )<tt> [virtual]</tt>
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</h3>
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<p> This virtual function is called when the user clicks inside the
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"What's this?" window. <em>href</em> is the link the user clicked on, or
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<a href="ntqstring.html#TQString-null">TQString::null</a> if there was no link.
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<p> If the function returns TRUE (the default), the "What's this?"
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window is closed, otherwise it remains visible.
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<p> The default implementation ignores <em>href</em> and returns TRUE.
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<h3 class=fn>void <a name="display"></a>TQWhatsThis::display ( const <a href="ntqstring.html">TQString</a> & text, const <a href="ntqpoint.html">TQPoint</a> & pos = TQCursor::pos ( ), <a href="ntqwidget.html">TQWidget</a> * w = 0 )<tt> [static]</tt>
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</h3>
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Display <em>text</em> in a help window at the global screen position <em>pos</em>.
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<p> If widget <em>w</em> is not 0 and has its own dedicated TQWhatsThis
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object, this object will receive <a href="#clicked">clicked</a>() messages when the user
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clicks on hyperlinks inside the help text.
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<p> <p>See also <a href="#clicked">TQWhatsThis::clicked</a>().
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<h3 class=fn>void <a name="enterWhatsThisMode"></a>TQWhatsThis::enterWhatsThisMode ()<tt> [static]</tt>
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</h3>
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Enters "What's this?" mode and returns immediately.
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<p> TQt will install a special cursor and take over mouse input until
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the user clicks somewhere. It then shows any help available and
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ends "What's this?" mode. Finally, TQt removes the special cursor
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and help window and then restores ordinary event processing, at
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which point the left mouse button is no longer pressed.
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<p> The user can also use the Esc key to leave "What's this?" mode.
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<p> <p>See also <a href="#inWhatsThisMode">inWhatsThisMode</a>() and <a href="#leaveWhatsThisMode">leaveWhatsThisMode</a>().
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<h3 class=fn>bool <a name="inWhatsThisMode"></a>TQWhatsThis::inWhatsThisMode ()<tt> [static]</tt>
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</h3>
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Returns TRUE if the application is in "What's this?" mode;
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otherwise returns FALSE.
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<p> <p>See also <a href="#enterWhatsThisMode">enterWhatsThisMode</a>() and <a href="#leaveWhatsThisMode">leaveWhatsThisMode</a>().
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<h3 class=fn>void <a name="leaveWhatsThisMode"></a>TQWhatsThis::leaveWhatsThisMode ( const <a href="ntqstring.html">TQString</a> & text = TQString::null, const <a href="ntqpoint.html">TQPoint</a> & pos = TQCursor::pos ( ), <a href="ntqwidget.html">TQWidget</a> * w = 0 )<tt> [static]</tt>
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</h3>
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Leaves "What's this?" question mode.
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<p> This function is used internally by widgets that support
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<a href="ntqwidget.html#customWhatsThis">TQWidget::customWhatsThis</a>(); applications do not usually call it.
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An example of such a widget is TQPopupMenu: menus still work
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normally in "What's this?" mode but also provide help texts for
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individual menu items.
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<p> If <em>text</em> is not <a href="ntqstring.html#TQString-null">TQString::null</a>, a "What's this?" help window is
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displayed at the global screen position <em>pos</em>. If widget <em>w</em> is
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not 0 and has its own dedicated TQWhatsThis object, this object
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will receive <a href="#clicked">clicked</a>() messages when the user clicks on hyperlinks
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inside the help text.
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<p> <p>See also <a href="#inWhatsThisMode">inWhatsThisMode</a>(), <a href="#enterWhatsThisMode">enterWhatsThisMode</a>(), and <a href="#clicked">TQWhatsThis::clicked</a>().
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<h3 class=fn>void <a name="remove"></a>TQWhatsThis::remove ( <a href="ntqwidget.html">TQWidget</a> * widget )<tt> [static]</tt>
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</h3>
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Removes the "What's this?" help associated with the <em>widget</em>.
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This happens automatically if the widget is destroyed.
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<p> <p>See also <a href="#add">add</a>().
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<h3 class=fn>void <a name="setFont"></a>TQWhatsThis::setFont ( const <a href="ntqfont.html">TQFont</a> & font )<tt> [static]</tt>
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</h3>
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Sets the font for all "What's this?" helps to <em>font</em>.
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<h3 class=fn><a href="ntqstring.html">TQString</a> <a name="text"></a>TQWhatsThis::text ( const <a href="ntqpoint.html">TQPoint</a> & )<tt> [virtual]</tt>
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</h3>
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This virtual function returns the text for position <em>p</em> in the
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widget that this "What's this?" object documents. If there is no
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"What's this?" text for the position, <a href="ntqstring.html#TQString-null">TQString::null</a> is returned.
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<p> The default implementation returns TQString::null.
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<h3 class=fn><a href="ntqstring.html">TQString</a> <a name="textFor"></a>TQWhatsThis::textFor ( <a href="ntqwidget.html">TQWidget</a> * w, const <a href="ntqpoint.html">TQPoint</a> & pos = TQPoint ( ), bool includeParents = FALSE )<tt> [static]</tt>
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</h3>
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Returns the what's this text for widget <em>w</em> or <a href="ntqstring.html#TQString-null">TQString::null</a> if
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there is no "What's this?" help for the widget. <em>pos</em> contains
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the mouse position; this is useful, for example, if you've
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subclassed to make the text that is displayed position dependent.
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<p> If <em>includeParents</em> is TRUE, parent widgets are taken into
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consideration as well when looking for what's this help text.
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<p> <p>See also <a href="#add">add</a>().
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<h3 class=fn><a href="ntqtoolbutton.html">TQToolButton</a> * <a name="whatsThisButton"></a>TQWhatsThis::whatsThisButton ( <a href="ntqwidget.html">TQWidget</a> * parent )<tt> [static]</tt>
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</h3>
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Creates a <a href="ntqtoolbutton.html">TQToolButton</a> preconfigured to enter "What's this?" mode
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when clicked. You will often use this with a tool bar as <em>parent</em>:
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<pre>
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(void) TQWhatsThis::whatsThisButton( my_help_tool_bar );
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</pre>
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<p>Example: <a href="helpsystem-example.html#x2699">helpsystem/mainwindow.cpp</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">TQt 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>TQt 3.3.8</div>
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</table></div></address></body>
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