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authorTimothy Pearson <[email protected]>2011-11-08 12:31:36 -0600
committerTimothy Pearson <[email protected]>2011-11-08 12:31:36 -0600
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+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>Window Geometry</title>
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+ <a href="index.html">
+<font color="#004faf">Home</font></a>
+ | <a href="classes.html">
+<font color="#004faf">All&nbsp;Classes</font></a>
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+<font color="#004faf">Functions</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>Window Geometry</h1>
+
+
+<h2> Overview
+</h2>
+<a name="1"></a><p> <a href="qwidget.html">TQWidget</a> provides several functions that deal with a widget's
+geometry. Some of these functions operate on the pure client area
+(i.e. the window excluding the window frame), others include the
+window frame. The differentiation is done in a way that covers the
+most common usage transparently.
+<p> <center><table cellpadding="4" cellspacing="2" border="0">
+<tr bgcolor="#f0f0f0">
+<td valign="top"><strong>Including the window frame:
+<td valign="top">x(), y(), frameGeometry(), pos() and move()
+<tr bgcolor="#d0d0d0">
+<td valign="top"><strong>Excluding the window frame:</strong>
+<td valign="top">geometry(), width(), height(), rect() and size()
+</table></center>
+<p> Note that the distinction only matters for decorated top-level
+widgets. For all child widgets, the frame geometry is equal to the
+widget's client geometry.
+<p> This diagram shows most of the functions in use:
+<center><img src="geometry.png" alt="Geometry diagram"></center>
+<p> <h2> Unix/X11 peculiarities
+</h2>
+<a name="2"></a><p> On Unix/X11, a window does not have a frame until the window manager
+decorates it. This happens asynchronously at some point in time after
+calling show() and the first paint event the window receives: or it
+does not happen at all. Bear in mind that X11 is policy-free (others
+call it flexible). Thus you cannot make any safe assumption about the
+decoration frame your window will get. Basic rule: there's always one
+user who uses a window manager that breaks your assumption, and who
+will complain to you.
+<p> Furthermore, a toolkit cannot simply place windows on the screen. All
+TQt can do is to send certain hints to the window manager. The window
+manager, a separate process, may either obey, ignore or misunderstand
+them. Due to the partially unclear Inter-Client Communication
+Conventions Manual (ICCCM), window placement is handled tquite
+differently in existing window managers.
+<p> X11 provides no standard or easy way to get the frame geometry once
+the window is decorated. TQt solves this problem with nifty heuristics
+and clever code that works on a wide range of window managers that
+exist today. Don't be surprised if you find one where frameGeometry()
+returns bogus results though.
+<p> Nor does X11 provide a way to maximize a window. The showMaximized()
+function in TQt therefore has to emulate the feature. Its result
+depends on the result of frameGeometry() and the capability of the
+window manager to do proper window placement, neither of which can be
+guaranteed.
+<p> <h2> Restoring a Window's Geometry
+</h2>
+<a name="3"></a><p> A common task in modern applications is to restore a window's geometry
+in a later session. On Windows, this is basically storing the result
+of geometry() and calling setGeometry() in the next session before
+calling show(). On X11, this won't work because an invisible window
+doesn't have a frame yet. The window manager would decorate the window
+later. When this happens, the window shifts towards the bottom/right
+corner of the screen depending on the size of the decoration frame. X
+theoretically provides a way to avoid this shift. Our tests have
+shown, though, that almost all window managers fail to implement this
+feature.
+<p> A workaround is to call setGeometry() after show(). This has the
+two disadvantages that the widget appears at a wrong place for a
+millisecond (results in flashing) and that currently only every
+second window manager gets it right. A safer solution is to store
+both pos() and size() and to restore the geometry using resize() and
+move() before calling show(), as demonstrated in the following
+example:
+<p> <pre>
+ MyWidget* widget = new MyWidget
+ ...
+ <a href="qpoint.html">TQPoint</a> p = widget-&gt;pos(); // store position
+ <a href="qsize.html">TQSize</a> s = widget-&gt;size(); // store size
+ ...
+ widget = new MyWidget;
+ widget-&gt;resize( s ); // restore size
+ widget-&gt;move( p ); // restore position
+ widget-&gt;show(); // show widget
+</pre>
+
+<p> This method works on both MS-Windows and most existing X11 window
+managers.
+<p>
+<!-- eof -->
+<p><address><hr><div align=center>
+<table width=100% cellspacing=0 border=0><tr>
+<td>Copyright &copy; 2007
+<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
+<td align=right><div align=right>TQt 3.3.8</div>
+</table></div></address></body>
+</html>