--- /dev/null
+/*
+ * Copyright (c) 2003-2004 Christopher Lenz and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ * Christopher Lenz - initial API and implementation
+ *
+ * $Id: CommentAction.java,v 1.1 2004-09-02 18:11:50 jsurfer Exp $
+ */
+
+package net.sourceforge.phpeclipse.css.ui.internal.editor;
+
+import java.util.ResourceBundle;
+
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.IRewriteTarget;
+import org.eclipse.jface.text.ITextSelection;
+import org.eclipse.jface.viewers.ISelection;
+import org.eclipse.jface.viewers.ISelectionProvider;
+import org.eclipse.ui.IEditorInput;
+import org.eclipse.ui.texteditor.IDocumentProvider;
+import org.eclipse.ui.texteditor.ITextEditor;
+import org.eclipse.ui.texteditor.ITextEditorExtension2;
+import org.eclipse.ui.texteditor.TextEditorAction;
+
+/**
+ * (Heavily inspired by the AddBlockComment class in JDT-UI)
+ */
+public class CommentAction extends TextEditorAction {
+
+ // Constructors ------------------------------------------------------------
+
+ /**
+ * Constructor.
+ *
+ * @param bundle the resource bundle
+ * @param prefix a prefix to be prepended to the various resource keys
+ * (described in <code>ResourceAction</code> constructor), or
+ * <code>null</code> if none
+ * @param editor the text editor
+ */
+ public CommentAction(ResourceBundle bundle, String prefix,
+ ITextEditor editor) {
+ super(bundle, prefix, editor);
+ }
+
+ // TextEditorAction Implementation -----------------------------------------
+
+ /**
+ * @see org.eclipse.jface.action.Action#run()
+ */
+ public void run() {
+ if (!isEnabled()) {
+ return;
+ }
+ ITextEditor editor = getTextEditor();
+ if ((editor == null) || !ensureEditable(editor)) {
+ return;
+ }
+ ITextSelection selection = getCurrentSelection();
+ if (!validSelection(selection)) {
+ return;
+ }
+ IDocumentProvider docProvider = editor.getDocumentProvider();
+ IEditorInput input = editor.getEditorInput();
+ if (docProvider == null || input == null) {
+ return;
+ }
+ IDocument document = docProvider.getDocument(input);
+ if (document == null) {
+ return;
+ }
+ IRewriteTarget target = (IRewriteTarget)
+ editor.getAdapter(IRewriteTarget.class);
+ if (target != null) {
+ target.beginCompoundChange();
+ }
+ try {
+ int offset = selection.getOffset();
+ String start = "/*"; //$NON-NLS-1$
+ document.replace(offset, 0, start);
+ document.replace(offset + selection.getLength() + start.length(), 0,
+ "*/"); //$NON-NLS-1$
+ } catch (BadLocationException e) {
+ // ignore
+ } finally {
+ if (target != null) {
+ target.endCompoundChange();
+ }
+ }
+ }
+
+ /**
+ * @see org.eclipse.ui.texteditor.TextEditorAction#update()
+ */
+ public void update() {
+ super.update();
+ if (isEnabled()) {
+ if (!validSelection(getCurrentSelection())) {
+ setEnabled(false);
+ }
+ }
+ }
+
+ // Private Methods ---------------------------------------------------------
+
+ /**
+ * Ensures that the editor is modifyable. If the editor is an instance of
+ * <code>ITextEditorExtension2</code>, its
+ * <code>validateEditorInputState</code> method is called, otherwise, the
+ * result of <code>isEditable</code> is returned.
+ *
+ * @param editor the editor to be checked
+ * @return <code>true</code> if the editor is editable, <code>false</code>
+ * otherwise
+ */
+ private boolean ensureEditable(ITextEditor editor) {
+ if (editor instanceof ITextEditorExtension2) {
+ ITextEditorExtension2 extension = (ITextEditorExtension2) editor;
+ return extension.validateEditorInputState();
+ }
+ return editor.isEditable();
+ }
+
+ /**
+ * Returns the editor's selection, or <code>null</code> if no selection can
+ * be obtained or the editor is <code>null</code>.
+ *
+ * @return the selection of the action's editor, or <code>null</code>
+ */
+ private ITextSelection getCurrentSelection() {
+ ITextEditor editor = getTextEditor();
+ if (editor != null) {
+ ISelectionProvider provider = editor.getSelectionProvider();
+ if (provider != null) {
+ ISelection selection = provider.getSelection();
+ if (selection instanceof ITextSelection) {
+ return (ITextSelection) selection;
+ }
+ }
+ }
+ return null;
+ }
+
+ /**
+ * Checks whether <code>selection</code> is valid, i.e. neither
+ * <code>null</code> or empty.
+ *
+ * @param selection the selection to check
+ * @return <code>true</code> if the selection is valid, <code>false</code>
+ * otherwise
+ */
+ private boolean validSelection(ITextSelection selection) {
+ if (selection != null) {
+ return (!selection.isEmpty() && (selection.getLength() > 0));
+ }
+ return false;
+ }
+
+}
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