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/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Anton Leherbauer (Wind River Systems)
*******************************************************************************/
package org.eclipse.cdt.internal.ui.text.c.hover;
import org.eclipse.jface.text.AbstractReusableInformationControlCreator;
import org.eclipse.jface.text.DefaultInformationControl;
import org.eclipse.jface.text.IInformationControl;
import org.eclipse.jface.text.IInformationControlCreator;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.information.IInformationProvider;
import org.eclipse.jface.text.information.IInformationProviderExtension2;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IPartListener;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.cdt.ui.text.c.hover.ICEditorTextHover;
/**
* Provides information for the current word under the cursor based on the documentation hover.
*
* @see CDocHover
* @since 5.0
*/
public class CInformationProvider implements IInformationProvider, IInformationProviderExtension2 {
/**
* Default control creator.
*/
private static final class ControlCreator extends AbstractReusableInformationControlCreator {
@Override
public IInformationControl doCreateInformationControl(Shell parent) {
return new DefaultInformationControl(parent);
}
}
/**
* Part listener handling editor close.
*/
class EditorWatcher implements IPartListener {
public void partOpened(IWorkbenchPart part) {
}
public void partDeactivated(IWorkbenchPart part) {
}
public void partClosed(IWorkbenchPart part) {
if (part == fEditor) {
fEditor.getSite().getWorkbenchWindow().getPartService().removePartListener(fPartListener);
fPartListener= null;
}
}
public void partActivated(IWorkbenchPart part) {
}
public void partBroughtToTop(IWorkbenchPart part) {
}
}
protected IEditorPart fEditor;
protected IPartListener fPartListener;
protected ICEditorTextHover fImplementation;
/**
* The default presentation control creator.
*/
private IInformationControlCreator fPresenterControlCreator;
public CInformationProvider(IEditorPart editor) {
fEditor= editor;
if (fEditor != null) {
fPartListener= new EditorWatcher();
IWorkbenchWindow window= fEditor.getSite().getWorkbenchWindow();
window.getPartService().addPartListener(fPartListener);
fImplementation= new CDocHover();
fImplementation.setEditor(fEditor);
}
}
/*
* @see IInformationProvider#getSubject(ITextViewer, int)
*/
public IRegion getSubject(ITextViewer textViewer, int offset) {
if (textViewer != null && fImplementation != null) {
return fImplementation.getHoverRegion(textViewer, offset);
}
return null;
}
/*
* @see IInformationProvider#getInformation(ITextViewer, IRegion)
*/
@SuppressWarnings("deprecation")
public String getInformation(ITextViewer textViewer, IRegion subject) {
if (fImplementation != null) {
String s= fImplementation.getHoverInfo(textViewer, subject);
if (s != null && s.trim().length() > 0) {
return s;
}
}
return null;
}
/*
* @see IInformationProviderExtension2#getInformationPresenterControlCreator()
*/
public IInformationControlCreator getInformationPresenterControlCreator() {
if (fPresenterControlCreator == null)
fPresenterControlCreator= new ControlCreator();
return fPresenterControlCreator;
}
}
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