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QUndoCommand
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  SUMMARY:&nbsp;<A HREF="#nested_classes_inherited_from_class_com.trolltech.qt.QSignalEmitter">NESTED</A>&nbsp;|&nbsp;FIELD&nbsp;|&nbsp;<A HREF="#constructor_summary">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
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com.trolltech.qt.gui</FONT>
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Class QUndoCommand</H2>
<PRE>
java.lang.Object
  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../com/trolltech/qt/QSignalEmitter.html" title="class in com.trolltech.qt">com.trolltech.qt.QSignalEmitter</A>
      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../com/trolltech/qt/QtJambiObject.html" title="class in com.trolltech.qt">com.trolltech.qt.QtJambiObject</A>
          <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.trolltech.qt.gui.QUndoCommand</B>
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<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../com/trolltech/qt/QtJambiInterface.html" title="interface in com.trolltech.qt">QtJambiInterface</A></DD>
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<DL>
<DT><PRE>public class <B>QUndoCommand</B><DT>extends <A HREF="../../../../com/trolltech/qt/QtJambiObject.html" title="class in com.trolltech.qt">QtJambiObject</A></DL>
</PRE>

<P>
<p>The <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a> class is the base class of all commands stored on a <a href="QUndoStack.html"><tt>QUndoStack</tt></a>.</p>
<p>For an overview of Qt's Undo Framework, see the <a href="%2E%2E/qundo.html">overview document</tt></a>.</p>
<p>A <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a> represents a single editing action on a document; for example, inserting or deleting a block of text in a text editor. <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a> can apply a change to the document with <a href="QUndoCommand.html#redo()"><tt>redo</tt></a> and undo the change with <a href="QUndoCommand.html#undo()"><tt>undo</tt></a>. The implementations for these functions must be provided in a derived class.</p>
<pre>    class AppendText : public QUndoCommand
    {
    public:
        AppendText(QString *doc, const QString &amp;text)
            : m_document(doc), m_text(text) { setText(&quot;append text&quot;); }
        virtual void undo()
            { m_document-&gt;chop(m_text.length()); }
        virtual void redo()
            { m_document-&gt;append(m_text); }
    private:
        QString *m_document;
        QString m_text;
    };</pre>
<p>A <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a> has an associated <a href="QUndoCommand.html#text()"><tt>text</tt></a>. This is a short string describing what the command does. It is used to update the text properties of the stack's undo and redo actions; see QUndoStack::createUndoAction() and QUndoStack::createRedoAction().</p>
<p><a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a> objects are owned by the stack they were pushed on. <a href="QUndoStack.html"><tt>QUndoStack</tt></a> deletes a command if it has been undone and a new command is pushed. For example:</p>
<pre>    MyCommand *command1 = new MyCommand();
    stack-&gt;push(command1);
    MyCommand *command2 = new MyCommand();
    stack-&gt;push(command2);

    stack-&gt;undo();

    MyCommand *command3 = new MyCommand();
    stack-&gt;push(command3); <span class="comment">// command2 gets deleted</span></pre>
<p>In effect, when a command is pushed, it becomes the top-most command on the stack.</p>
<p>To support command compression, <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a> has an <a href="QUndoCommand.html#id()"><tt>id</tt></a> and the virtual function <a href="QUndoCommand.html#mergeWith(com.trolltech.qt.gui.QUndoCommand)"><tt>mergeWith</tt></a>. These functions are used by QUndoStack::push().</p>
<p>To support command macros, a <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a> object can have any number of child commands. Undoing or redoing the parent command will cause the child commands to be undone or redone. A command can be assigned to a parent explicitly in the constructor. In this case, the command will be owned by the parent.</p>
<p>The parent in this case is usually an empty command, in that it doesn't provide its own implementation of <a href="QUndoCommand.html#undo()"><tt>undo</tt></a> and <a href="QUndoCommand.html#redo()"><tt>redo</tt></a>. Instead, it uses the base implementations of these functions, which simply call <a href="QUndoCommand.html#undo()"><tt>undo</tt></a> or <a href="QUndoCommand.html#redo()"><tt>redo</tt></a> on all its children. The parent should, however, have a meaningful <a href="QUndoCommand.html#text()"><tt>text</tt></a>.</p>
<pre>    QUndoCommand *insertRed = new QUndoCommand(); <span class="comment">// an empty command</span>
    insertRed-&gt;setText(&quot;insert red text&quot;);

    new InsertText(document, idx, text, insertRed); <span class="comment">// becomes child of insertRed</span>
    new SetColor(document, idx, text.length(), Qt::red, insertRed);

    stack.push(insertRed);</pre>
<p>Another way to create macros is to use the convenience functions QUndoStack::beginMacro() and QUndoStack::endMacro().</p>
<P>

<P>
<DL>
<DT><B>See Also:</B><DD><a href="QUndoStack.html"><tt>QUndoStack</tt></a></DL>
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<TH ALIGN="left"><B>Nested classes/interfaces inherited from class com.trolltech.qt.<A HREF="../../../../com/trolltech/qt/QSignalEmitter.html" title="class in com.trolltech.qt">QSignalEmitter</A></B></TH>
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<TD><CODE><A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal0.html" title="class in com.trolltech.qt">QSignalEmitter.Signal0</A>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal1.html" title="class in com.trolltech.qt">QSignalEmitter.Signal1</A>&lt;<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal1.html" title="type parameter in QSignalEmitter.Signal1">A</A>&gt;, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal2.html" title="class in com.trolltech.qt">QSignalEmitter.Signal2</A>&lt;<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal2.html" title="type parameter in QSignalEmitter.Signal2">A</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal2.html" title="type parameter in QSignalEmitter.Signal2">B</A>&gt;, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal3.html" title="class in com.trolltech.qt">QSignalEmitter.Signal3</A>&lt;<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal3.html" title="type parameter in QSignalEmitter.Signal3">A</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal3.html" title="type parameter in QSignalEmitter.Signal3">B</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal3.html" title="type parameter in QSignalEmitter.Signal3">C</A>&gt;, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal4.html" title="class in com.trolltech.qt">QSignalEmitter.Signal4</A>&lt;<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal4.html" title="type parameter in QSignalEmitter.Signal4">A</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal4.html" title="type parameter in QSignalEmitter.Signal4">B</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal4.html" title="type parameter in QSignalEmitter.Signal4">C</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal4.html" title="type parameter in QSignalEmitter.Signal4">D</A>&gt;, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal5.html" title="class in com.trolltech.qt">QSignalEmitter.Signal5</A>&lt;<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal5.html" title="type parameter in QSignalEmitter.Signal5">A</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal5.html" title="type parameter in QSignalEmitter.Signal5">B</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal5.html" title="type parameter in QSignalEmitter.Signal5">C</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal5.html" title="type parameter in QSignalEmitter.Signal5">D</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal5.html" title="type parameter in QSignalEmitter.Signal5">E</A>&gt;, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal6.html" title="class in com.trolltech.qt">QSignalEmitter.Signal6</A>&lt;<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal6.html" title="type parameter in QSignalEmitter.Signal6">A</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal6.html" title="type parameter in QSignalEmitter.Signal6">B</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal6.html" title="type parameter in QSignalEmitter.Signal6">C</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal6.html" title="type parameter in QSignalEmitter.Signal6">D</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal6.html" title="type parameter in QSignalEmitter.Signal6">E</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal6.html" title="type parameter in QSignalEmitter.Signal6">F</A>&gt;, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal7.html" title="class in com.trolltech.qt">QSignalEmitter.Signal7</A>&lt;<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal7.html" title="type parameter in QSignalEmitter.Signal7">A</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal7.html" title="type parameter in QSignalEmitter.Signal7">B</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal7.html" title="type parameter in QSignalEmitter.Signal7">C</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal7.html" title="type parameter in QSignalEmitter.Signal7">D</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal7.html" title="type parameter in QSignalEmitter.Signal7">E</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal7.html" title="type parameter in QSignalEmitter.Signal7">F</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal7.html" title="type parameter in QSignalEmitter.Signal7">G</A>&gt;, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal8.html" title="class in com.trolltech.qt">QSignalEmitter.Signal8</A>&lt;<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal8.html" title="type parameter in QSignalEmitter.Signal8">A</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal8.html" title="type parameter in QSignalEmitter.Signal8">B</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal8.html" title="type parameter in QSignalEmitter.Signal8">C</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal8.html" title="type parameter in QSignalEmitter.Signal8">D</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal8.html" title="type parameter in QSignalEmitter.Signal8">E</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal8.html" title="type parameter in QSignalEmitter.Signal8">F</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal8.html" title="type parameter in QSignalEmitter.Signal8">G</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal8.html" title="type parameter in QSignalEmitter.Signal8">H</A>&gt;, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="class in com.trolltech.qt">QSignalEmitter.Signal9</A>&lt;<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">A</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">B</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">C</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">D</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">E</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">F</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">G</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">H</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">I</A>&gt;</CODE></TD>
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<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html#QUndoCommand()">QUndoCommand</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Equivalent to <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a>(0).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html#QUndoCommand(com.trolltech.qt.gui.QUndoCommand)">QUndoCommand</A></B>(<A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html" title="class in com.trolltech.qt.gui">QUndoCommand</A>&nbsp;parent)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs a <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a> object with parent <tt>parent</tt>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html#QUndoCommand(java.lang.String)">QUndoCommand</A></B>(java.lang.String&nbsp;text)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Equivalent to <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a>(<tt>text</tt>, 0).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)">QUndoCommand</A></B>(java.lang.String&nbsp;text,
             <A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html" title="class in com.trolltech.qt.gui">QUndoCommand</A>&nbsp;parent)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs a <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a> object with the given <tt>parent</tt> and <tt>text</tt>.</TD>
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<!-- ========== METHOD SUMMARY =========== -->

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<B>Method Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;<A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html" title="class in com.trolltech.qt.gui">QUndoCommand</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html#fromNativePointer(com.trolltech.qt.QNativePointer)">fromNativePointer</A></B>(<A HREF="../../../../com/trolltech/qt/QNativePointer.html" title="class in com.trolltech.qt">QNativePointer</A>&nbsp;nativePointer)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This function returns the QUndoCommand instance pointed to by nativePointer</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html#id()">id</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the ID of this command.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html#mergeWith(com.trolltech.qt.gui.QUndoCommand)">mergeWith</A></B>(<A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html" title="class in com.trolltech.qt.gui">QUndoCommand</A>&nbsp;other)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Attempts to merge this command with <tt>other</tt>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html#redo()">redo</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Applies a change to the document.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html#setText(java.lang.String)">setText</A></B>(java.lang.String&nbsp;text)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets the command's text to be the <tt>text</tt> specified.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html#text()">text</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns a short text string describing what this command does; for example, &quot;insert text&quot;.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html#undo()">undo</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reverts a change to the document.</TD>
</TR>
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<TH ALIGN="left"><B>Methods inherited from class com.trolltech.qt.<A HREF="../../../../com/trolltech/qt/QtJambiObject.html" title="class in com.trolltech.qt">QtJambiObject</A></B></TH>
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<TD><CODE><A HREF="../../../../com/trolltech/qt/QtJambiObject.html#dispose()">dispose</A>, <A HREF="../../../../com/trolltech/qt/QtJambiObject.html#disposed()">disposed</A>, <A HREF="../../../../com/trolltech/qt/QtJambiObject.html#finalize()">finalize</A>, <A HREF="../../../../com/trolltech/qt/QtJambiObject.html#reassignNativeResources(com.trolltech.qt.QtJambiObject, java.lang.Class)">reassignNativeResources</A>, <A HREF="../../../../com/trolltech/qt/QtJambiObject.html#tr(java.lang.String)">tr</A>, <A HREF="../../../../com/trolltech/qt/QtJambiObject.html#tr(java.lang.String, java.lang.String)">tr</A>, <A HREF="../../../../com/trolltech/qt/QtJambiObject.html#tr(java.lang.String, java.lang.String, int)">tr</A></CODE></TD>
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<TD><CODE><A HREF="../../../../com/trolltech/qt/QSignalEmitter.html#blockSignals(boolean)">blockSignals</A>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.html#disconnect()">disconnect</A>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.html#disconnect(java.lang.Object)">disconnect</A>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.html#signalsBlocked()">signalsBlocked</A>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.html#signalSender()">signalSender</A>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.html#thread()">thread</A></CODE></TD>
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<TH ALIGN="left"><B>Methods inherited from interface com.trolltech.qt.<A HREF="../../../../com/trolltech/qt/QtJambiInterface.html" title="interface in com.trolltech.qt">QtJambiInterface</A></B></TH>
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<TD><CODE><A HREF="../../../../com/trolltech/qt/QtJambiInterface.html#disableGarbageCollection()">disableGarbageCollection</A>, <A HREF="../../../../com/trolltech/qt/QtJambiInterface.html#nativeId()">nativeId</A>, <A HREF="../../../../com/trolltech/qt/QtJambiInterface.html#nativePointer()">nativePointer</A>, <A HREF="../../../../com/trolltech/qt/QtJambiInterface.html#reenableGarbageCollection()">reenableGarbageCollection</A>, <A HREF="../../../../com/trolltech/qt/QtJambiInterface.html#setJavaOwnership()">setJavaOwnership</A></CODE></TD>
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<A NAME="QUndoCommand()"><!-- --></A><H3>
QUndoCommand</H3>
<PRE>
public <B>QUndoCommand</B>()</PRE>
<DL>
<DD><p>Equivalent to <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a>(0).
<P>
</DL>
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<A NAME="QUndoCommand(com.trolltech.qt.gui.QUndoCommand)"><!-- --></A><H3>
QUndoCommand</H3>
<PRE>
public <B>QUndoCommand</B>(<A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html" title="class in com.trolltech.qt.gui">QUndoCommand</A>&nbsp;parent)</PRE>
<DL>
<DD><p>Constructs a <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a> object with parent <tt>parent</tt>.</p>
<p>If <tt>parent</tt> is not 0, this command is appended to parent's child list. The parent command then owns this command and will delete it in its destructor.</p>
<P>
<DL>
<DT><B>See Also:</B><DD><tt>~QUndoCommand</tt></DL>
</DL>
<HR>

<A NAME="QUndoCommand(java.lang.String)"><!-- --></A><H3>
QUndoCommand</H3>
<PRE>
public <B>QUndoCommand</B>(java.lang.String&nbsp;text)</PRE>
<DL>
<DD><p>Equivalent to <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a>(<tt>text</tt>, 0).
<P>
</DL>
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<A NAME="QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><!-- --></A><H3>
QUndoCommand</H3>
<PRE>
public <B>QUndoCommand</B>(java.lang.String&nbsp;text,
                    <A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html" title="class in com.trolltech.qt.gui">QUndoCommand</A>&nbsp;parent)</PRE>
<DL>
<DD><p>Constructs a <a href="QUndoCommand.html#QUndoCommand(java.lang.String, com.trolltech.qt.gui.QUndoCommand)"><tt>QUndoCommand</tt></a> object with the given <tt>parent</tt> and <tt>text</tt>.</p>
<p>If <tt>parent</tt> is not 0, this command is appended to parent's child list. The parent command then owns this command and will delete it in its destructor.</p>
<P>
<DL>
<DT><B>See Also:</B><DD><tt>~QUndoCommand</tt></DL>
</DL>

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<A NAME="setText(java.lang.String)"><!-- --></A><H3>
setText</H3>
<PRE>
public final void <B>setText</B>(java.lang.String&nbsp;text)</PRE>
<DL>
<DD><p>Sets the command's text to be the <tt>text</tt> specified.</p>
<p>The specified text should be a short user-readable string describing what this command does.</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QUndoCommand.html#text()"><tt>text</tt></a>, 
<tt>QUndoStack::createUndoAction</tt>, 
<tt>QUndoStack::createRedoAction</tt></DL>
</DD>
</DL>
<HR>

<A NAME="text()"><!-- --></A><H3>
text</H3>
<PRE>
public final java.lang.String <B>text</B>()</PRE>
<DL>
<DD><p>Returns a short text string describing what this command does; for example, &quot;insert text&quot;.</p>
<p>The text is used when the text properties of the stack's undo and redo actions are updated.</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QUndoCommand.html#setText(java.lang.String)"><tt>setText</tt></a>, 
<tt>QUndoStack::createUndoAction</tt>, 
<tt>QUndoStack::createRedoAction</tt></DL>
</DD>
</DL>
<HR>

<A NAME="id()"><!-- --></A><H3>
id</H3>
<PRE>
public int <B>id</B>()</PRE>
<DL>
<DD><p>Returns the ID of this command.</p>
<p>A command ID is used in command compression. It must be an integer unique to this command's class, or -1 if the command doesn't support compression.</p>
<p>If the command supports compression this function must be overridden in the derived class to return the correct ID. The base implementation returns -1.</p>
<p>QUndoStack::push() will only try to merge two commands if they have the same ID, and the ID is not -1.</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QUndoCommand.html#mergeWith(com.trolltech.qt.gui.QUndoCommand)"><tt>mergeWith</tt></a>, 
<tt>QUndoStack::push</tt></DL>
</DD>
</DL>
<HR>

<A NAME="mergeWith(com.trolltech.qt.gui.QUndoCommand)"><!-- --></A><H3>
mergeWith</H3>
<PRE>
public boolean <B>mergeWith</B>(<A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html" title="class in com.trolltech.qt.gui">QUndoCommand</A>&nbsp;other)</PRE>
<DL>
<DD><p>Attempts to merge this command with <tt>other</tt>. Returns true on success; otherwise returns false.</p>
<p>If this function returns true, calling this command's <a href="QUndoCommand.html#redo()"><tt>redo</tt></a> must have the same effect as redoing both this command and <tt>other</tt>. Similarly, calling this command's <a href="QUndoCommand.html#undo()"><tt>undo</tt></a> must have the same effect as undoing <tt>other</tt> and this command.</p>
<p><a href="QUndoStack.html"><tt>QUndoStack</tt></a> will only try to merge two commands if they have the same id, and the id is not -1.</p>
<p>The default implementation returns false.</p>
<pre>    bool AppendText::mergeWith(const QUndoCommand *other)
    {
        if (other-&gt;id() != id()) <span class="comment">// make sure other is also an AppendText command</span>
            return false;
        m_text += static_cast&lt;const AppendText*&gt;(other)-&gt;m_text;
        return true;
    }</pre>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QUndoCommand.html#id()"><tt>id</tt></a>, 
<tt>QUndoStack::push</tt></DL>
</DD>
</DL>
<HR>

<A NAME="redo()"><!-- --></A><H3>
redo</H3>
<PRE>
public void <B>redo</B>()</PRE>
<DL>
<DD><p>Applies a change to the document. This function must be implemented in the derived class. Calling QUndoStack::push(), QUndoStack::undo() or QUndoStack::redo() from this function leads to undefined beahavior.</p>
<p>The default implementation calls <a href="QUndoCommand.html#redo()"><tt>redo</tt></a> on all child commands.</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QUndoCommand.html#undo()"><tt>undo</tt></a></DL>
</DD>
</DL>
<HR>

<A NAME="undo()"><!-- --></A><H3>
undo</H3>
<PRE>
public void <B>undo</B>()</PRE>
<DL>
<DD><p>Reverts a change to the document. After <a href="QUndoCommand.html#undo()"><tt>undo</tt></a> is called, the state of the document should be the same as before <a href="QUndoCommand.html#redo()"><tt>redo</tt></a> was called. This function must be implemented in the derived class. Calling QUndoStack::push(), QUndoStack::undo() or QUndoStack::redo() from this function leads to undefined beahavior.</p>
<p>The default implementation calls <a href="QUndoCommand.html#undo()"><tt>undo</tt></a> on all child commands in reverse order.</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QUndoCommand.html#redo()"><tt>redo</tt></a></DL>
</DD>
</DL>
<HR>

<A NAME="fromNativePointer(com.trolltech.qt.QNativePointer)"><!-- --></A><H3>
fromNativePointer</H3>
<PRE>
public static <A HREF="../../../../com/trolltech/qt/gui/QUndoCommand.html" title="class in com.trolltech.qt.gui">QUndoCommand</A> <B>fromNativePointer</B>(<A HREF="../../../../com/trolltech/qt/QNativePointer.html" title="class in com.trolltech.qt">QNativePointer</A>&nbsp;nativePointer)</PRE>
<DL>
<DD>This function returns the QUndoCommand instance pointed to by nativePointer
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>nativePointer</CODE> - the QNativePointer of which object should be returned.</DL>
</DD>
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