snippet002treeviewer.java

对于可视的桌面开发系统的一些详细的设计资料

/*******************************************************************************
 * Copyright (c) 2006 Tom Schindl 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:
 *     Tom Schindl - initial API and implementation
 *******************************************************************************/

package org.eclipse.jface.snippets.viewers;

import java.util.ArrayList;

import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

/**
 * A simple TreeViewer to demonstrate usage
 * 
 * @author Tom Schindl <[e-mail]>
 *
 */
public class Snippet002TreeViewer {
	private class MyContentProvider implements ITreeContentProvider {
		
		/* (non-Javadoc)
		 * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
		 */
		public Object[] getElements(Object inputElement) {
			return ((MyModel)inputElement).child.toArray();
		}

		/* (non-Javadoc)
		 * @see org.eclipse.jface.viewers.IContentProvider#dispose()
		 */
		public void dispose() {
			
		}

		/* (non-Javadoc)
		 * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
		 */
		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
			
		}

		/* (non-Javadoc)
		 * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
		 */
		public Object[] getChildren(Object parentElement) {
			return getElements(parentElement);
		}

		/* (non-Javadoc)
		 * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
		 */
		public Object getParent(Object element) {
			if( element == null) {
				return null;
			}
			
			return ((MyModel)element).parent;
		}

		/* (non-Javadoc)
		 * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
		 */
		public boolean hasChildren(Object element) {
			return ((MyModel)element).child.size() > 0;
		}
		
	}
	
	public class MyModel {
		public MyModel parent;
		public ArrayList child = new ArrayList();
		public int counter;
		
		public MyModel(int counter, MyModel parent) {
			this.parent = parent;
			this.counter = counter;
		}
		
		public String toString() {
			String rv = "Item ";
			if( parent != null ) {
				rv = parent.toString() + ".";
			}
			
			rv += counter;
			
			return rv;
		}
	}
	
	public Snippet002TreeViewer(Shell shell) {
		final TreeViewer v = new TreeViewer(shell);
		v.setLabelProvider(new LabelProvider());
		v.setContentProvider(new MyContentProvider());
		v.setInput(createModel());
	}
	
	private MyModel createModel() {
		
		MyModel root = new MyModel(0,null);
		root.counter = 0;
		
		MyModel tmp;
		for( int i = 1; i < 10; i++ ) {
			tmp = new MyModel(i, root);
			root.child.add(tmp);
			for( int j = 1; j < i; j++ ) {
				tmp.child.add(new MyModel(j,tmp));
			}
		}
		
		return root;
	}
	
	public static void main(String[] args) {
		Display display = new Display ();
		Shell shell = new Shell(display);
		shell.setLayout(new FillLayout());
		new Snippet002TreeViewer(shell);
		shell.open ();
		
		while (!shell.isDisposed ()) {
			if (!display.readAndDispatch ()) display.sleep ();
		}
		
		display.dispose ();
	}
}