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<p>1 версия</p> <table class="diff diff-contentalign-left" data-mw="interface"> <tr style="vertical-align: top;" lang="ru"> <td colspan="1" style="background-color: white; color:black; text-align: center;">← Предыдущая</td> <td colspan="1" style="background-color: white; color:black; text-align: center;">Версия 05:57, 1 июня 2010</td> </tr><tr><td colspan="2" style="text-align: center;" lang="ru"><div class="mw-diff-empty">(нет различий)</div> </td></tr></table>

Admin http://www.jexp.ru/index.php?title=Java/SWT_JFace_Eclipse/Undo_Redo&diff=5715&oldid=prev 2010-05-31T18:01:43Z

<p></p> <p><b>Новая страница</b></p><div>== SWT Undo Redo ==<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> &lt;!-- start source code --&gt;<br /> <br /> &lt;source lang=&quot;java&quot;&gt;<br /> /*<br /> SWT/JFace in Action<br /> GUI Design with Eclipse 3.0<br /> Matthew Scarpino, Stephen Holder, Stanford Ng, and Laurent Mihalkovic<br /> ISBN: 1932394273<br /> Publisher: Manning<br /> */<br /> <br /> import java.util.LinkedList;<br /> import java.util.List;<br /> import org.eclipse.swt.SWT;<br /> import org.eclipse.swt.custom.ExtendedModifyEvent;<br /> import org.eclipse.swt.custom.ExtendedModifyListener;<br /> import org.eclipse.swt.custom.StyledText;<br /> import org.eclipse.swt.events.KeyAdapter;<br /> import org.eclipse.swt.events.KeyEvent;<br /> import org.eclipse.swt.layout.FillLayout;<br /> import org.eclipse.swt.widgets.ruposite;<br /> public class Ch5Undoable extends Composite {<br /> private static final int MAX_STACK_SIZE = 25;<br /> private List undoStack;<br /> private List redoStack;<br /> private StyledText styledText;<br /> public Ch5Undoable(Composite parent) {<br /> super(parent, SWT.NONE);<br /> undoStack = new LinkedList();<br /> redoStack = new LinkedList();<br /> buildControls();<br /> }<br /> private void buildControls() {<br /> this.setLayout(new FillLayout());<br /> styledText = new StyledText(this, SWT.MULTI | SWT.V_SCROLL);<br /> styledText.addExtendedModifyListener(new ExtendedModifyListener() {<br /> public void modifyText(ExtendedModifyEvent event) {<br /> String currText = styledText.getText();<br /> String newText = currText.substring(event.start, event.start<br /> + event.length);<br /> if (newText != null &amp;&amp; newText.length() &gt; 0) {<br /> if (undoStack.size() == MAX_STACK_SIZE) {<br /> undoStack.remove(undoStack.size() - 1);<br /> }<br /> undoStack.add(0, newText);<br /> }<br /> }<br /> });<br /> styledText.addKeyListener(new KeyAdapter() {<br /> public void keyPressed(KeyEvent e) {<br /> switch (e.keyCode) {<br /> case SWT.F1:<br /> undo();<br /> break;<br /> case SWT.F2:<br /> redo();<br /> break;<br /> default:<br /> //ignore everything else<br /> }<br /> }<br /> });<br /> }<br /> private void undo() {<br /> if (undoStack.size() &gt; 0) {<br /> String lastEdit = (String) undoStack.remove(0);<br /> int editLength = lastEdit.length();<br /> String currText = styledText.getText();<br /> int startReplaceIndex = currText.length() - editLength;<br /> styledText.replaceTextRange(startReplaceIndex, editLength, &quot;&quot;);<br /> redoStack.add(0, lastEdit);<br /> }<br /> }<br /> private void redo() {<br /> if (redoStack.size() &gt; 0) {<br /> String text = (String) redoStack.remove(0);<br /> moveCursorToEnd();<br /> styledText.append(text);<br /> moveCursorToEnd();<br /> }<br /> }<br /> private void moveCursorToEnd() {<br /> styledText.setCaretOffset(styledText.getText().length());<br /> }<br /> }<br /> <br /> &lt;/source&gt;<br /> <br /> <br /> &lt;!-- end source code --&gt;</div>