| package org.eclipse.ui.views.framelist; |
| |
| /********************************************************************** |
| Copyright (c) 2000, 2001, 2002, International Business Machines 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: |
| **********************************************************************/ |
| import org.eclipse.ui.help.WorkbenchHelp; |
| |
| /** |
| * Generic "Back" action which goes back one frame, |
| */ |
| public class BackAction extends FrameAction { |
| |
| /** |
| * Constructs a new action for the specified frame list. |
| * |
| * @param frameList the frame list |
| */ |
| public BackAction(FrameList frameList) { |
| super(frameList); |
| setText(FrameListMessages.getString("Back.text")); //$NON-NLS-1$ |
| setHoverImageDescriptor(getImageDescriptor("clcl16/backward_nav.gif")); //$NON-NLS-1$ |
| setImageDescriptor(getImageDescriptor("elcl16/backward_nav.gif")); //$NON-NLS-1$ |
| setDisabledImageDescriptor(getImageDescriptor("dlcl16/backward_nav.gif")); //$NON-NLS-1$ |
| WorkbenchHelp.setHelp(this, IFrameListHelpContextIds.BACK_ACTION); |
| update(); |
| } |
| |
| private Frame getPreviousFrame() { |
| FrameList list = getFrameList(); |
| return list.getFrame(list.getCurrentIndex() - 1); |
| } |
| |
| private String getToolTipText(Frame previousFrame) { |
| if (previousFrame != null) { |
| String text = previousFrame.getToolTipText(); |
| if (text != null && text.length() > 0) { |
| return FrameListMessages.format("Back.toolTipOneArg", new Object[] { text }); //$NON-NLS-1$ |
| } |
| } |
| return FrameListMessages.getString("Back.toolTip"); //$NON-NLS-1$ |
| } |
| |
| /** |
| * Calls <code>back()</code> on the frame list. |
| */ |
| public void run() { |
| getFrameList().back(); |
| } |
| |
| /** |
| * Updates this action's enabled state and tool tip text. |
| * This action is enabled only when there is a previous frame in the frame list. |
| * The tool tip text is "Back to " plus the tool tip text for the previous frame. |
| */ |
| public void update() { |
| super.update(); |
| Frame previousFrame = getPreviousFrame(); |
| setEnabled(previousFrame != null); |
| setToolTipText(getToolTipText(previousFrame)); |
| } |
| |
| } |