| /********************************************************************** |
| Copyright (c) 2000, 2002 IBM Corp. and others. |
| All rights reserved. This program and the accompanying materials |
| are made available under the terms of the Common Public License v0.5 |
| which accompanies this distribution, and is available at |
| http://www.eclipse.org/legal/cpl-v05.html |
| |
| Contributors: |
| IBM Corporation - Initial API and implementation |
| **********************************************************************/ |
| package org.eclipse.ui.texteditor; |
| |
| |
| import java.util.ResourceBundle; |
| import org.eclipse.jface.text.ITextOperationTarget; |
| |
| |
| /** |
| * Action for shifting code to the right or left by one indentation level. |
| */ |
| public final class ShiftAction extends TextEditorAction implements IReadOnlyDependent { |
| |
| /** The text operation code */ |
| private int fOperationCode= -1; |
| /** The text operation target */ |
| private ITextOperationTarget fOperationTarget; |
| |
| /** |
| * Creates and initializes the action for the given text editor and operation |
| * code. The action configures its visual representation from the given resource |
| * bundle. The action works by asking the text editor at the time for its |
| * text operation target adapter (using |
| * <code>getAdapter(ITextOperationTarget.class)</code>. The action runs that |
| * operation with the given opcode. |
| * |
| * @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 |
| * @param operationCode the operation code |
| * @see ResourceAction#ResourceAction |
| */ |
| public ShiftAction(ResourceBundle bundle, String prefix, ITextEditor editor, int operationCode) { |
| super(bundle, prefix, editor); |
| fOperationCode= operationCode; |
| update(); |
| } |
| |
| /** |
| * The <code>TextOperationAction</code> implementation of this |
| * <code>IAction</code> method runs the operation with the current |
| * operation code. |
| */ |
| public void run() { |
| if (fOperationCode != -1 && fOperationTarget != null) |
| fOperationTarget.doOperation(fOperationCode); |
| } |
| |
| /* |
| * @see IUpdate#update() |
| */ |
| public void update() { |
| |
| ITextEditor editor= getTextEditor(); |
| if (editor instanceof ITextEditorExtension) { |
| ITextEditorExtension extension= (ITextEditorExtension) editor; |
| if (extension.isEditorInputReadOnly()) { |
| setEnabled(false); |
| return; |
| } |
| } |
| |
| if (fOperationTarget == null && editor!= null && fOperationCode != -1) |
| fOperationTarget= (ITextOperationTarget) editor.getAdapter(ITextOperationTarget.class); |
| |
| boolean isEnabled= (fOperationTarget != null && fOperationTarget.canDoOperation(fOperationCode)); |
| setEnabled(isEnabled); |
| } |
| |
| /* |
| * @see TextEditorAction#setEditor(ITextEditor) |
| */ |
| public void setEditor(ITextEditor editor) { |
| super.setEditor(editor); |
| fOperationTarget= null; |
| } |
| |
| /* |
| * @see IReadOnlyDependent#isEnabled(boolean) |
| */ |
| public boolean isEnabled(boolean isWritable) { |
| |
| if (!isWritable) |
| return false; |
| |
| /* |
| * Note that this implementation still honors the result returned by canDoOperation. |
| * I.e. if the viewer is set to read-only, this method still returns false. |
| * It covers the case in which the viewer is also writable. |
| * |
| */ |
| ITextEditor editor= getTextEditor(); |
| if (fOperationTarget == null && editor!= null && fOperationCode != -1) |
| fOperationTarget= (ITextOperationTarget) editor.getAdapter(ITextOperationTarget.class); |
| |
| return (fOperationTarget != null && fOperationTarget.canDoOperation(fOperationCode)); |
| } |
| } |