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authorTimothy Pearson <[email protected]>2011-07-10 15:24:15 -0500
committerTimothy Pearson <[email protected]>2011-07-10 15:24:15 -0500
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+<title>Object Trees and Object Ownership</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>Object Trees and Object Ownership</h1>
+
+
+
+<p> <a href="qobject.html">QObjects</a> organize themselves in object trees.
+When you create a <a href="qobject.html">QObject</a> with another object as parent, it's added to
+the parent's <a href="qobject.html#children">children()</a> list, and
+is deleted when the parent is. It turns out that this approach fits
+the needs of GUI objects very well. For example, a <a href="qaccel.html">QAccel</a> (keyboard
+accelerator) is a child of the relevant window, so when the user closes
+that window, the accelerator is deleted too.
+<p> The static function <a href="qobject.html#objectTrees">QObject::objectTrees</a>() provides access to all
+the root objects that currently exist.
+<p> <a href="qwidget.html">QWidget</a>, the base class of everything that appears on the screen,
+extends the parent-child relationship. A child normally also becomes a
+child widget, i.e. it is displayed in its parent's coordinate system
+and is graphically clipped by its parent's boundaries. For example,
+when the an application deletes a message box after it has been
+closed, the message box's buttons and label are also deleted, just as
+we'd want, because the buttons and label are children of the message
+box.
+<p> You can also delete child objects yourself, and they will remove
+themselves from their parents. For example, when the user removes a
+toolbar it may lead to the application deleting one of its <a href="qtoolbar.html">QToolBar</a>
+objects, in which case the tool bar's <a href="qmainwindow.html">QMainWindow</a> parent would
+detect the change and reconfigure its screen space accordingly.
+<p> The debugging functions <a href="qobject.html#dumpObjectTree">QObject::dumpObjectTree</a>() and <a href="qobject.html#dumpObjectInfo">QObject::dumpObjectInfo</a>() are often useful when an application looks or
+acts strangely.
+<p>
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+<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
+<td align=right><div align=right>Qt 3.3.8</div>
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