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/*****************************************************************************
* Copyright (c) 2010 CEA LIST.
*
* 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:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.views.properties.xwt;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.databinding.observable.ChangeEvent;
import org.eclipse.core.databinding.observable.IChangeListener;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.papyrus.infra.constraints.ConstraintDescriptor;
import org.eclipse.papyrus.infra.constraints.constraints.Constraint;
import org.eclipse.papyrus.infra.constraints.runtime.ConstraintFactory;
import org.eclipse.papyrus.views.properties.Activator;
import org.eclipse.papyrus.views.properties.contexts.Section;
import org.eclipse.papyrus.views.properties.contexts.View;
import org.eclipse.papyrus.views.properties.modelelement.DataSource;
import org.eclipse.papyrus.views.properties.modelelement.DataSourceFactory;
import org.eclipse.papyrus.views.properties.runtime.DisplayEngine;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.views.properties.tabbed.AbstractPropertySection;
import org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage;
/**
* An Implementation of ISection for the TabbedPropertyView framework.
* The XWTSection uses an XWT File to display the SWT Controls, and
* a DataSource for DataBinding
*
* @author Camille Letavernier
*/
public class XWTSection extends AbstractPropertySection implements IChangeListener {
private Section section;
private DataSource source;
private View view;
private Composite self;
private DisplayEngine display;
private Set<Constraint> constraints;
/**
* Constructor.
*
* @param section
* The Section object containing the Metadata for the XWTSection
* @param view
* The view this section belongs to
* @param display
* The display engine that will generate the SWT Controls
*/
public XWTSection(Section section, View view, DisplayEngine display) {
this.section = section;
this.view = view;
this.display = display;
}
@Override
public void createControls(Composite parent, TabbedPropertySheetPage tabbedPropertySheetPage) {
self = new Composite(parent, SWT.NONE);
GridLayout layout = new GridLayout(1, false);
layout.marginHeight = 0;
layout.marginWidth = 0;
self.setLayout(layout);
layout = new GridLayout(1, false);
layout.verticalSpacing = 0;
layout.marginHeight = 0;
layout.marginWidth = 5;
parent.setLayout(layout);
GridData data = new GridData(SWT.FILL, SWT.FILL, true, true);
self.setLayoutData(data);
self.setBackground(parent.getBackground());
self.setBackgroundMode(SWT.INHERIT_DEFAULT);
}
@Override
public void setInput(IWorkbenchPart part, ISelection selection) {
if(selection == getSelection()) {
return;
}
//Sets the initial input, *or* changes the input for the same view : we need to clean the cache
DataSourceFactory.instance.removeFromCache(getSelection(), view);
super.setInput(part, selection);
if(selection instanceof IStructuredSelection) {
IStructuredSelection structuredSelection = (IStructuredSelection)selection;
setSource(DataSourceFactory.instance.createDataSourceFromSelection(structuredSelection, view));
}
}
private void setSource(DataSource source) {
if(this.source != null) {
this.source.removeChangeListener(this);
this.source.dispose();
}
this.source = source;
if(section.getConstraints().size() > 0) {
source.addChangeListener(this);
}
}
/**
* Displays the section
*
* @param refresh
* If true, and the section has already been displayed, the controls will be
* regenerated. If false, the section will only be displayed if it hasn't been
* displayed yet, or if the display engine allows duplication of sections
*/
public void display(boolean refresh) {
if(self.isDisposed()) {
Activator.log.debug("Error : widget is disposed"); //$NON-NLS-1$
dispose();
return;
}
if(!isApplied()) {
hide();
return;
}
self.setRedraw(false);
if(refresh) {
display.refreshSection(self, section, source);
} else {
display.createSection(self, section, source);
}
self.setRedraw(true);
}
private void hide() {
display.removeSection(self);
}
@Override
public void refresh() {
display(false);
}
/**
* Tests if this section is applied. A section is applied if it doesn't have
* any constraint, or if at least one of its constraints match the current selection
*
* @return
* True if the section should be displayed
*/
protected boolean isApplied() {
if(getConstraints().isEmpty()) {
return true;
}
ISelection selection = getSelection();
//Return true only if at least one constraint matches the selection
for(Constraint constraint : getConstraints()) {
if(constraint.match((IStructuredSelection)selection)) {
return true;
}
}
return false;
}
protected Set<Constraint> getConstraints() {
if(constraints == null) {
constraints = new HashSet<Constraint>();
for(ConstraintDescriptor constraintDescriptor : section.getConstraints()) {
Constraint constraint = ConstraintFactory.getInstance().createFromModel(constraintDescriptor);
if(constraint != null) {
constraints.add(constraint);
}
}
}
return constraints;
}
@Override
public void dispose() {
//Dispose the DataSource
if(source != null) {
source.removeChangeListener(this);
source.dispose();
}
//Dispose the SWT Composite
if(self != null) {
self.dispose();
}
//Clean the DataSource cache
DataSourceFactory.instance.removeFromCache(getSelection(), view);
super.dispose();
}
@Override
public IStructuredSelection getSelection() {
return (IStructuredSelection)super.getSelection();
}
@Override
public String toString() {
return "XWTSection : " + section.getName(); //$NON-NLS-1$
}
public void handleChange(ChangeEvent event) {
display(true);
}
}
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