PropertyEditorHolder.java

/*
  PropertyEditorHolder.java

  (c) 2010-2012 Edward Swartz

  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
 */
package org.ejs.gui.properties;

import org.eclipse.jface.layout.GridDataFactory;
import org.eclipse.jface.layout.GridLayoutFactory;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Link;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;

import ejs.base.properties.IProperty;
import ejs.base.properties.IPropertyProvider;


/**
 * @author ejs
 *
 */
public class PropertyEditorHolder  {

	private final IProperty property;
	private IPropertyEditorControl theFieldEditorControl;
	private final IPropertyEditorProvider propertyEditorProvider;

	/* (non-Javadoc)
	 * 
	 */
	/**
	 * @param propertyEditorProvider 
	 * @param propertySource
	 * @param label 
	 */
	public PropertyEditorHolder(IProperty property, IPropertyEditorProvider propertyEditorProvider) {
		this.property = property;
		this.propertyEditorProvider = propertyEditorProvider;
	}

	public IPropertyEditorControl createEditor(EditGroup group) {
		if (!(property.getValue() instanceof IPropertyProvider)) {
			return createFormattedEditor(group, group.getContainer());
		}
		else {
			return createFormattedEditor(group, group.getSubcontainer());
		}
	}
	
	protected IPropertyEditorControl createFormattedEditor(final EditGroup group, Composite composite) {
		final Composite holder = new Composite(composite, SWT.NONE);
		GridLayoutFactory.fillDefaults().numColumns(2).applyTo(holder);
		GridDataFactory.fillDefaults().grab(true, false).applyTo(holder);
		
		final Link link;
		link = new Link(holder, SWT.NONE);
		GridDataFactory.fillDefaults().align(SWT.LEFT, SWT.CENTER).applyTo(link);

		if (property.getClassFactory() != null) {
			link.setText("<a href=\"new\">" + property.getLabel() + "</a>");
			link.addSelectionListener(new SelectionAdapter() {
				@Override
				public void widgetSelected(SelectionEvent e) {
					createNewProperty(holder, link);
				}
			});
		} else {
			link.setText(property.getLabel());
		}
		
		
		IPropertyEditorControl editor = setupEditor(holder);
		return editor;
	}

	/**
	 * @param parent
	 */
	private IPropertyEditorControl setupEditor(Composite parent) {
		if(theFieldEditorControl != null) {
			theFieldEditorControl.getControl().dispose();
			theFieldEditorControl = null;
		}
		//IPropertyEditor editor = property.createEditor();
		IPropertyEditor editor = propertyEditorProvider != null ? 
				propertyEditorProvider.createEditor(property) : null;
		if (editor == null) {
			return null;
		}
		IPropertyEditorControl control = editor.createEditor(parent);
		if (control == null) {
			return null;
		}
		GridDataFactory.fillDefaults().grab(true, false).minSize(50, -1).applyTo(control.getControl());
		
		theFieldEditorControl = control;
		
		return control;		
	}

	/**
	 * @param parent 
	 */
	protected void createNewProperty(final Composite parent, final Control label) {
		String[] ids = property.getClassFactory().getIds();
		Menu menu = new Menu(label);
		
		for (String id : ids) {
			final String theId = id;
			MenuItem item = new MenuItem(menu, SWT.PUSH);
			item.setText(id);
			item.addSelectionListener(new SelectionAdapter() {
				@Override
				public void widgetSelected(SelectionEvent e) {
					Object value = property.getClassFactory().create(theId);
					property.setValue(value);
					setupEditor(parent);
					parent.getShell().pack();
				}
			});
		}
		
		MenuItem item = new MenuItem(menu, SWT.PUSH);
		item.setText("Delete");
		item.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				property.setValue(null);
				if (theFieldEditorControl != null) {
					theFieldEditorControl.getControl().dispose();
					theFieldEditorControl = null;
				}
				parent.getShell().pack();
			}
		});
		
		menu.setVisible(true);
	}

}