ui/org.eclipse.pde.ui/src/org/eclipse/pde/internal/ui/editor/plugin/rows/ChoiceAttributeRow.java

/*******************************************************************************
 * Copyright (c) 2003, 2007 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
 *******************************************************************************/
/*
 * Created on Jan 30, 2004
 *
 * To change the template for this generated file go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
package org.eclipse.pde.internal.ui.editor.plugin.rows;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.pde.internal.core.ischema.ISchemaAttribute;
import org.eclipse.pde.internal.core.ischema.ISchemaEnumeration;
import org.eclipse.pde.internal.core.ischema.ISchemaRestriction;
import org.eclipse.pde.internal.core.ischema.ISchemaSimpleType;
import org.eclipse.pde.internal.ui.PDEPlugin;
import org.eclipse.pde.internal.ui.editor.FormLayoutFactory;
import org.eclipse.pde.internal.ui.editor.IContextPart;
import org.eclipse.pde.internal.ui.parts.ComboPart;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.forms.widgets.FormToolkit;


public class ChoiceAttributeRow extends ExtensionAttributeRow {
	protected ComboPart combo;
	/**
	 * @param att
	 */
	public ChoiceAttributeRow(IContextPart part, ISchemaAttribute att) {
		super(part, att);
	}

	public void createContents(Composite parent, FormToolkit toolkit, int span) {
		super.createContents(parent, toolkit, span);
		createLabel(parent, toolkit);
		combo = new ComboPart();
		combo.createControl(parent, toolkit, SWT.READ_ONLY);
		ISchemaSimpleType type = getAttribute().getType();
		ISchemaRestriction restriction = type.getRestriction();
		if (restriction!=null) {
			Object rchildren[] = restriction.getChildren();
			if (getUse()!=ISchemaAttribute.REQUIRED)
				combo.add(""); //$NON-NLS-1$
			for (int i=0; i<rchildren.length; i++) {
				Object rchild = rchildren[i];
				if (rchild instanceof ISchemaEnumeration)
					combo.add(((ISchemaEnumeration)rchild).getName());
			}
		}
		GridData gd = new GridData(span==2?GridData.FILL_HORIZONTAL:GridData.HORIZONTAL_ALIGN_FILL);
		gd.widthHint = 20;
		gd.horizontalSpan = span-1;
		gd.horizontalIndent = FormLayoutFactory.CONTROL_HORIZONTAL_INDENT;
		combo.getControl().setLayoutData(gd);
		combo.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				if (!blockNotification) markDirty();
			}
		});
		combo.getControl().setEnabled(part.isEditable());
	}
	/* (non-Javadoc)
	 * @see org.eclipse.pde.internal.ui.neweditor.plugin.ExtensionElementEditor#update(org.eclipse.pde.internal.ui.neweditor.plugin.DummyExtensionElement)
	 */
	protected void update() {
		blockNotification=true;
		String value = getValue();
		if (value!= null && isValid(value))
			combo.setText(value); 
		else if (getUse()==ISchemaAttribute.REQUIRED)
			combo.setText(getValidValue());
		else
			combo.setText(""); //$NON-NLS-1$
		blockNotification = false;
		dirty=false;
	}
	
	protected String getValidValue(){
		ISchemaAttribute attInfo = getAttribute();
		if (attInfo.getType().getRestriction()!= null)
			return attInfo.getType().getRestriction().getChildren()[0].toString();		
		return ""; //$NON-NLS-1$
	}
	
	protected boolean isValid(String value){
		if (getAttribute().getUse() != ISchemaAttribute.REQUIRED && value.equals("")) //$NON-NLS-1$
			return true;
		
		ISchemaRestriction restriction = getAttribute().getType().getRestriction();
		if (restriction == null)
			return true;
		Object[] children = restriction.getChildren();
		for (int i =0; i<children.length; i++){
			Object rchild = children[i];
			if (rchild instanceof ISchemaEnumeration && ((ISchemaEnumeration)rchild).getName().equals(value))
				return true;
		}
		return false;
	}
	public void commit() {
		if (dirty && input != null) {
			try {
				String selection = combo.getSelection();
				if (selection.length()==0) selection = null;
				input.setAttribute(getName(), selection);
				dirty = false;
			} catch (CoreException e) {
				PDEPlugin.logException(e);
			}
		}
	}	
	public void setFocus() {
		combo.getControl().setFocus();
	}
}