| /******************************************************************************* |
| * Copyright (c) 2000, 2018 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| |
| package org.eclipse.ui.texteditor; |
| |
| |
| import java.util.ResourceBundle; |
| |
| import org.eclipse.swt.custom.BusyIndicator; |
| import org.eclipse.swt.widgets.Display; |
| import org.eclipse.swt.widgets.Shell; |
| |
| import org.eclipse.jface.text.ITextOperationTarget; |
| |
| import org.eclipse.ui.IWorkbenchPartSite; |
| |
| |
| |
| /** |
| * Action for shifting code to the right or left by one indentation level. |
| * @since 2.0 |
| */ |
| public 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 TextEditorAction#TextEditorAction(ResourceBundle, String, ITextEditor) |
| */ |
| 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. |
| */ |
| @Override |
| public void run() { |
| if (fOperationCode == -1 || fOperationTarget == null) |
| return; |
| |
| ITextEditor editor= getTextEditor(); |
| if (editor == null) |
| return; |
| |
| if (!validateEditorInputState()) |
| return; |
| |
| Display display= null; |
| |
| IWorkbenchPartSite site= editor.getSite(); |
| Shell shell= site.getShell(); |
| if (shell != null && !shell.isDisposed()) |
| display= shell.getDisplay(); |
| |
| BusyIndicator.showWhile(display, () -> fOperationTarget.doOperation(fOperationCode)); |
| } |
| |
| @Override |
| public void update() { |
| super.update(); |
| if (!isEnabled()) |
| return; |
| |
| if (!canModifyEditor()) { |
| setEnabled(false); |
| return; |
| } |
| |
| ITextEditor editor= getTextEditor(); |
| if (fOperationTarget == null && editor != null && fOperationCode != -1) |
| fOperationTarget= editor.getAdapter(ITextOperationTarget.class); |
| |
| } |
| |
| /** |
| * Enablement when tab key is pressed - the current selection has to be cover multiple lines. |
| * |
| * @since 3.0 |
| */ |
| protected void updateForTab() { |
| super.update(); |
| |
| if (isEnabled()) { |
| if (!canModifyEditor()) { |
| setEnabled(false); |
| return; |
| } |
| |
| ITextEditor editor= getTextEditor(); |
| if (fOperationTarget == null && editor != null && fOperationCode != -1) |
| fOperationTarget= editor.getAdapter(ITextOperationTarget.class); |
| |
| boolean isEnabled= (fOperationTarget != null && fOperationTarget.canDoOperation(fOperationCode)); |
| setEnabled(isEnabled); |
| } |
| |
| } |
| |
| @Override |
| public void setEditor(ITextEditor editor) { |
| super.setEditor(editor); |
| fOperationTarget= null; |
| } |
| |
| @Override |
| 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= editor.getAdapter(ITextOperationTarget.class); |
| |
| return (fOperationTarget != null && fOperationTarget.canDoOperation(fOperationCode)); |
| } |
| } |