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/*******************************************************************************
* Copyright (c) 2000, 2011 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.compare;
import java.util.ResourceBundle;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.compare.internal.CompareMessages;
import org.eclipse.compare.internal.CompareUIPlugin;
import org.eclipse.compare.internal.Utilities;
/**
* A <code>NavigationAction</code> is used to navigate through the individual
* differences of a <code>CompareEditorInput</code>.
* <p>
* Clients may instantiate this class; it is not intended to be subclassed.
* </p>
* @since 2.0
* @noextend This class is not intended to be subclassed by clients.
*/
public class NavigationAction extends Action {
private boolean fNext;
private CompareEditorInput fCompareEditorInput;
/**
* Creates a <code>NavigationAction</code>.
*
* @param next if <code>true</code> action goes to the next difference; otherwise to the previous difference.
*/
public NavigationAction(boolean next) {
this(CompareUI.getResourceBundle(), next);
}
/**
* Creates a <code>NavigationAction</code> that initializes its attributes
* from the given <code>ResourceBundle</code>.
*
* @param bundle is used to initialize the action
* @param next if <code>true</code> action goes to the next difference; otherwise to the previous difference.
*/
public NavigationAction(ResourceBundle bundle, boolean next) {
Utilities.initAction(this, bundle, next ? "action.Next." : "action.Previous."); //$NON-NLS-2$ //$NON-NLS-1$
fNext= next;
}
@Override
public void run() {
if (fCompareEditorInput != null) {
Object adapter= fCompareEditorInput.getAdapter(ICompareNavigator.class);
if (adapter instanceof ICompareNavigator) {
boolean atEnd= ((ICompareNavigator)adapter).selectChange(fNext);
Shell shell= CompareUIPlugin.getShell();
if (atEnd && shell != null) {
Display display= shell.getDisplay();
if (display != null)
display.beep();
String title;
String message;
if (fNext) {
title= CompareMessages.CompareNavigator_atEnd_title;
message= CompareMessages.CompareNavigator_atEnd_message;
} else {
title= CompareMessages.CompareNavigator_atBeginning_title;
message= CompareMessages.CompareNavigator_atBeginning_message;
}
MessageDialog.openInformation(shell, title, message);
}
}
}
}
/**
* Sets the <code>CompareEditorInput</code> on which this action operates.
*
* @param input the <code>CompareEditorInput</code> on which this action operates; if <code>null</code> action does nothing
*/
public void setCompareEditorInput(CompareEditorInput input) {
fCompareEditorInput= input;
}
}
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