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package org.eclipse.ui.examples.readmetool;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved.
*/
import org.eclipse.ui.*;
import org.eclipse.jface.action.*;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.*;
/**
* This class demonstrates the contribution of a custom control to the
* status line for the readme editor. The control shows the
* dirty status of the editor.
*/
public class DirtyStateContribution extends ControlContribution
implements IPropertyListener
{
private Composite composite;
private Label label;
private IEditorPart activeEditor;
/**
* Creates a new DirtyStateContribution.
*/
protected DirtyStateContribution() {
super("DirtyState"); //$NON-NLS-1$
}
/* (non-Javadoc)
* Method declared on ControlContribution
*/
protected Control createControl(Composite parent) {
// If the composite is good just return it.
if (composite != null && !composite.isDisposed())
return composite;
// Create composite for border.
composite = new Composite(parent, SWT.BORDER);
composite.setData(this);
// Create label inside composite.
label = new Label(composite, SWT.NONE);
label.setSize(80, 15);
updateState();
return composite;
}
/**
* Called when an editor is activated.
*
* @see ReadmeEditorActionBarContributor#setActiveEditor(IEditorPart)
*/
public void editorChanged(IEditorPart part) {
if (activeEditor != null) {
activeEditor.removePropertyListener(this);
}
activeEditor = part;
if (activeEditor != null) {
activeEditor.addPropertyListener(this);
}
updateState();
}
/* (non-Javadoc)
* Method declared on IPropertyListener
*/
public void propertyChanged(Object source, int propID) {
if (source instanceof IEditorPart)
updateState();
}
/**
* Updates the state of the label.
*/
private void updateState() {
if (label == null || label.isDisposed())
return;
boolean saveNeeded = false;
if (activeEditor != null)
saveNeeded = activeEditor.isDirty();
if (saveNeeded)
label.setText(MessageUtil.getString("Save_Needed")); //$NON-NLS-1$
else
label.setText(MessageUtil.getString("Clean")); //$NON-NLS-1$
}
}
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