/*******************************************************************************
* 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 net.sourceforge.texlipse;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.ISelectionListener;
import org.eclipse.ui.ISelectionService;
import org.eclipse.ui.IWindowListener;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
/**
* Maintains the context used to expand variables. The context is based on
* the selected resource.
*
* Also contains a reference to the last selected tex file.
*
* @see org.eclipse.debug.internal.ui.stringsubstitution.SelectedResourceManager
* @author Eclipse.org
* @author Kimmo Karlsson
*/
public class SelectedResourceManager implements IWindowListener, ISelectionListener {
// singleton
private static SelectedResourceManager fgDefault;
// last file that was made active
private IResource fSelectedResource = null;
// last piece of text that was made active
private String fSelectedText = null;
// last tex file that was made active
private IResource fSelectedTexResource = null;
private int fSelectedLine;
/**
* Private constructor to use with the singleton.
*/
private SelectedResourceManager() {
IWorkbench workbench = PlatformUI.getWorkbench();
if (workbench != null) { //may be running headless
workbench.addWindowListener(this);
IWorkbenchWindow activeWindow = workbench.getActiveWorkbenchWindow();
if (activeWindow != null) {
windowActivated(activeWindow);
}
}
}
/**
* Returns the singleton resource selection manager
*
* @return VariableContextManager
*/
public static SelectedResourceManager getDefault() {
if (fgDefault == null) {
fgDefault = new SelectedResourceManager();
}
return fgDefault;
}
/**
* @see org.eclipse.ui.IWindowListener#windowActivated(org.eclipse.ui.IWorkbenchWindow)
*/
public void windowActivated(IWorkbenchWindow window) {
ISelectionService service = window.getSelectionService();
service.addSelectionListener(this);
IWorkbenchPage page = window.getActivePage();
if (page != null) {
IWorkbenchPart part = page.getActivePart();
if (part != null) {
ISelection selection = service.getSelection();
if (selection != null) {
selectionChanged(part, selection);
}
}
}
}
/**
* @see org.eclipse.ui.IWindowListener#windowClosed(org.eclipse.ui.IWorkbenchWindow)
*/
public void windowClosed(IWorkbenchWindow window) {
window.getSelectionService().removeSelectionListener(this);
}
/**
* @see org.eclipse.ui.IWindowListener#windowDeactivated(org.eclipse.ui.IWorkbenchWindow)
*/
public void windowDeactivated(IWorkbenchWindow window) {
window.getSelectionService().removeSelectionListener(this);
}
/**
* @see org.eclipse.ui.IWindowListener#windowOpened(org.eclipse.ui.IWorkbenchWindow)
*/
public void windowOpened(IWorkbenchWindow window) {
}
/**
* @see org.eclipse.ui.ISelectionListener#selectionChanged(org.eclipse.ui.IWorkbenchPart, org.eclipse.jface.viewers.ISelection)
*/
public void selectionChanged(IWorkbenchPart part, ISelection selection) {
IResource selectedResource = null;
if (selection instanceof IStructuredSelection) {
Object result = ((IStructuredSelection)selection).getFirstElement();
if (result instanceof IResource) {
selectedResource = (IResource) result;
} else if (result instanceof IAdaptable) {
selectedResource = (IResource)((IAdaptable) result).getAdapter(IResource.class);
}
}
if (selectedResource == null) {
// If the active part is an editor, get the file resource used as input.
if (part instanceof IEditorPart) {
IEditorPart editorPart = (IEditorPart) part;
IEditorInput input = editorPart.getEditorInput();
selectedResource = (IResource) input.getAdapter(IResource.class);
}
}
if (selectedResource != null) {
fSelectedResource = selectedResource;
if ("tex".equalsIgnoreCase(fSelectedResource.getFileExtension()) ||
"ltx".equalsIgnoreCase(fSelectedResource.getFileExtension())) {
fSelectedTexResource = fSelectedResource;
}
}
if (selection instanceof ITextSelection) {
fSelectedText = ((ITextSelection)selection).getText();
fSelectedLine = ((ITextSelection)selection).getStartLine();
}
}
/**
* Returns the currently selected resource in the active workbench window,
* or <code>null</code> if none. If an editor is active, the resource adapater
* associated with the editor is returned.
*
* @return selected resource or <code>null</code>
*/
public IResource getSelectedResource() {
return fSelectedResource;
}
/**
* Returns the current text selection as a <code>String</code>, or <code>null</code> if
* none.
*
* @return the current text selection as a <code>String</code> or <code>null</code>
*/
public String getSelectedText() {
return fSelectedText;
}
/**
* Returns the current text selection as a <code>String</code>, or <code>null</code> if
* none.
*
* @return the current text selection as a <code>String</code> or <code>null</code>
*/
public IResource getSelectedTexResource() {
return fSelectedTexResource;
}
/**
* Returns the number of the currently selected line.
* @return the number of the currently selected line
*/
public int getSelectedLine() {
return fSelectedLine;
}
}