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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.internal.texteditor;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.text.Position;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.help.WorkbenchHelp;
import org.eclipse.ui.texteditor.IAbstractTextEditorHelpContextIds;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.ui.texteditor.ITextEditorActionDefinitionIds;
/**
* Goes to last edit position.
*
* @see org.eclipse.ui.internal.texteditor.EditPosition
* @since 2.1
*/
public class GotoLastEditPositionAction extends Action implements IWorkbenchWindowActionDelegate {
/** The worbench window */
private IWorkbenchWindow fWindow;
/** The action */
private IAction fAction;
/**
* Creates a goto last edit action.
*/
public GotoLastEditPositionAction() {
WorkbenchHelp.setHelp(this, IAbstractTextEditorHelpContextIds.GOTO_LAST_EDIT_POSITION_ACTION);
setId(ITextEditorActionDefinitionIds.GOTO_LAST_EDIT_POSITION);
setActionDefinitionId(ITextEditorActionDefinitionIds.GOTO_LAST_EDIT_POSITION);
setEnabled(false);
}
/*
* @see IWorkbenchWindowActionDelegate#init(org.eclipse.ui.IWorkbenchWindow)
*/
public void init(IWorkbenchWindow window) {
fWindow= window;
}
/*
* @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction)
*/
public void run(IAction action) {
run();
}
/*
* @see IAction#run()
*/
public void run() {
EditPosition editPosition= TextEditorPlugin.getDefault().getLastEditPosition();
if (editPosition == null)
return;
final Position pos= editPosition.getPosition();
if (pos == null || pos.isDeleted)
return;
IWorkbenchWindow window= getWindow();
if (window == null)
return;
IWorkbenchPage page= window.getActivePage();
IEditorPart editor;
try {
editor= page.openEditor(editPosition.getEditorInput(), editPosition.getEditorId());
} catch (PartInitException ex) {
editor= null;
}
// Optimization - could also use else branch
if (editor instanceof ITextEditor) {
ITextEditor textEditor= (ITextEditor)editor;
textEditor.selectAndReveal(pos.offset, pos.length);
}
// } else
// if (editor != null) {
// final IEditorInput input= editor.getEditorInput();
// final IEditorPart finalEditor= editor;
// if (input instanceof IFileEditorInput) {
//
// WorkspaceModifyOperation op = new WorkspaceModifyOperation() {
// protected void execute(IProgressMonitor monitor) throws CoreException {
// IMarker marker= null;
// try {
// marker= ((IFileEditorInput)input).getFile().createMarker(IMarker.TEXT);
// marker.setAttribute(IMarker.CHAR_START, pos.offset);
// marker.setAttribute(IMarker.CHAR_END, pos.offset + pos.length);
//
// finalEditor.gotoMarker(marker);
//
// } finally {
// if (marker != null)
// marker.delete();
// }
// }
// };
//
// try {
// op.run(null);
// } catch (InvocationTargetException ex) {
// String message= EditorMessages.getString("Editor.error.gotoLastEditPosition.message"); //$NON-NLS-1$
// if (fWindow != null) {
// Shell shell= fWindow.getShell();
// String title= EditorMessages.getString("Editor.error.gotoLastEditPosition.title"); //$NON-NLS-1$
// MessageDialog.openError(shell, title, message);
// } else {
// Throwable t= ex.getTargetException();
// IStatus status= new Status(IStatus.ERROR, PlatformUI.PLUGIN_ID, 0, message, t);
// TextEditorPlugin.getDefault().getLog().log(status);
// }
// } catch (InterruptedException e) {
// Assert.isTrue(false, "this operation can not be cancelled"); //$NON-NLS-1$
// }
// }
// editor.setFocus();
// }
}
/*
* @see org.eclipse.ui.IActionDelegate#selectionChanged(org.eclipse.jface.action.IAction, org.eclipse.jface.viewers.ISelection)
*/
public void selectionChanged(IAction action, ISelection selection) {
boolean enabled= TextEditorPlugin.getDefault().getLastEditPosition() != null;
setEnabled(enabled);
action.setEnabled(enabled);
// This is no longer needed once the action is enabled.
if (!enabled) {
// adding the same action twice has no effect.
TextEditorPlugin.getDefault().addLastEditPositionDependentAction(action);
// this is always the same action for this instance
fAction= action;
}
}
/**
* Returns the workbench window.
*
* @return the workbench window
*/
private IWorkbenchWindow getWindow() {
if (fWindow == null)
fWindow= PlatformUI.getWorkbench().getActiveWorkbenchWindow();
return fWindow;
}
/*
* @see IWorkbenchWindowActionDelegate#dispose()
*/
public void dispose() {
fWindow= null;
TextEditorPlugin.getDefault().removeLastEditPositionDependentAction(fAction);
}
}
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