Attachment 164200 Details for Bug 305739 – Snippetv01

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Snippetv01

Snippet.java (text/plain), 6.68 KB, created by Hitesh

on 2010-04-08 07:48:53 EDT

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Description:

Filename:

MIME Type:

Creator: Hitesh

Created: 2010-04-08 07:48:53 EDT

Size: 6.68 KB

patch

obsolete

>/*******************************************************************************
> * Copyright (c) 2000, 2010 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 
> *******************************************************************************/
>
>package org.eclipse.jface.snippets.viewers;
>
>import java.util.Random;
>
>import org.eclipse.jface.viewers.ILazyTreeContentProvider;
>import org.eclipse.jface.viewers.LabelProvider;
>import org.eclipse.jface.viewers.TreeViewer;
>import org.eclipse.jface.viewers.Viewer;
>import org.eclipse.swt.SWT;
>import org.eclipse.swt.events.SelectionEvent;
>import org.eclipse.swt.events.SelectionListener;
>import org.eclipse.swt.layout.GridData;
>import org.eclipse.swt.layout.GridLayout;
>import org.eclipse.swt.widgets.Button;
>import org.eclipse.swt.widgets.Display;
>import org.eclipse.swt.widgets.ScrollBar;
>import org.eclipse.swt.widgets.Shell;
>
>public class Snippet {
>
>	private static final int TOP_PARENTS = 5;
>	private static final int LEVEL = 6;
>	private static final int COUNT = 3;
>	static Random random = new Random();
>	private Node[] elements;
>	private int genCount = 0;
>	private TreeViewer fViewer;
>
>	private class ContentProvider implements ILazyTreeContentProvider {
>		private TreeViewer viewer;
>
>		public ContentProvider(TreeViewer viewer) {
>			this.viewer = viewer;
>		}
>
>		public void dispose() {
>
>		}
>
>		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
>			elements = (Node[]) newInput;
>		}
>
>		/*
>		 * (non-Javadoc)
>		 * 
>		 * @see
>		 * org.eclipse.jface.viewers.ILazyTreeContentProvider#getParent(java
>		 * .lang.Object)
>		 */
>		public Object getParent(Object element) {
>			Node node = (Node) element;
>			if (node.isLeaf())
>				return node.parent;
>			return elements;
>		}
>
>		/*
>		 * (non-Javadoc)
>		 * 
>		 * @see
>		 * org.eclipse.jface.viewers.ILazyTreeContentProvider#updateChildCount
>		 * (java.lang.Object, int)
>		 */
>		public void updateChildCount(Object element, int currentChildCount) {
>			int length = 0;
>			if (element instanceof Node) {
>				Node node = (Node) element;
>				length = node.children.length;
>			}
>			if (element == elements)
>				length = elements.length;
>			viewer.setChildCount(element, length);
>		}
>
>		/*
>		 * (non-Javadoc)
>		 * 
>		 * @see
>		 * org.eclipse.jface.viewers.ILazyTreeContentProvider#updateElement(
>		 * java.lang.Object, int)
>		 */
>		public void updateElement(Object parent, int index) {
>			Object element;
>			if (parent instanceof Node)
>				element = ((Node) parent).children[index];
>			else
>				element = elements[index];
>			viewer.replace(parent, index, element);
>			updateChildCount(element, -1);
>
>		}
>
>	}
>
>	private int nodeCounter = 0;
>
>	class Node {
>		String name;
>		int count;
>		Node parent;
>		Node[] children = new Node[0];
>
>		public Node(String name) {
>			this(name, null);
>		}
>
>		public Node(String name, Node parent) {
>			this.name = name;
>			this.parent = parent;
>			count = nodeCounter++;
>		}
>
>		public boolean isLeaf() {
>			return children == null || children.length == 0;
>		}
>
>		public String toString() {
>			if (isLeaf()) {
>				return parent.toString() + name + "-Leaf-" + count;
>			}
>			return name + "-Node-" + count;
>		}
>
>		public void generateChildren(String prefix, int count, int level,
>				boolean recursive) {
>			children = new Node[count];
>			for (int j = 0; j < count; j++) {
>				children[j] = new Node(prefix, this);
>				if (recursive && level > 1) {
>					children[j].generateChildren(prefix, count, level - 1,
>							recursive);
>				}
>			}
>		}
>	}
>
>	public Snippet(Shell shell) {
>		fViewer = new TreeViewer(shell, SWT.VIRTUAL | SWT.MULTI | SWT.BORDER);
>		fViewer.getTree().setLayoutData(new GridData(GridData.FILL_BOTH));
>		Button button = new Button(shell, SWT.PUSH);
>		button.setText("Refresh and Reveal");
>		button.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
>		button.addSelectionListener(new SelectionListener() {
>			public void widgetSelected(SelectionEvent e) {
>				refreshModel();
>				refresh();
>				for (int i = 0; i < elements.length; i++) {
>					expandToLevel(elements[i], random.nextBoolean() ? LEVEL
>							: LEVEL / 2);
>				}
>				Object node = revealRandomLeaf();
>				Object[] objects = fViewer.testFindItems(node);
>				System.out.println("Reveal:Found widgets " + objects.length);
>				scroll2Random();
>			}
>
>			public void widgetDefaultSelected(SelectionEvent e) {
>			}
>		});
>		fViewer.setLabelProvider(new LabelProvider());
>		fViewer.setContentProvider(new ContentProvider(fViewer));
>		fViewer.setUseHashlookup(true);
>		Node[] model = createModel();
>		fViewer.setInput(model);
>		fViewer.setAutoExpandLevel(LEVEL);
>	}
>
>	Node[] createModel() {
>		nodeCounter = 0;
>		String prefix = "Gen" + genCount;
>		Node[] elements = new Node[TOP_PARENTS];
>		for (int i = 0; i < TOP_PARENTS; i++) {
>			elements[i] = new Node(prefix);
>			elements[i].generateChildren(prefix, COUNT, LEVEL, true);
>		}
>		genCount++;
>		return elements;
>	}
>
>	void refreshModel() {
>		nodeCounter = 0;
>		String prefix = "Gen" + genCount;
>		for (int i = 0; i < TOP_PARENTS; i++) {
>			elements[i] = new Node(prefix);
>			elements[i].generateChildren(prefix, COUNT, LEVEL, true);
>		}
>		genCount++;
>	}
>
>	void refresh() {
>		fViewer.refresh(true);
>	}
>
>	void autoExpand() {
>		fViewer.setAutoExpandLevel(LEVEL);
>	}
>
>	Node revealRandomLeaf() {
>		Node elementOrTreePath = elements[elements.length - 1];
>		while (!elementOrTreePath.isLeaf()) {
>			elementOrTreePath = elementOrTreePath.children[0];
>		}
>		fViewer.reveal(elementOrTreePath);
>		return elementOrTreePath;
>	}
>
>	void expandToLevel(Node element, int level) {
>		fViewer.expandToLevel(element, level);
>	}
>
>	void scroll2Random() {
>		ScrollBar bar = fViewer.getTree().getVerticalBar();
>		int max = bar.getMaximum();
>		int min = bar.getMaximum();
>		int curr = bar.getSelection();
>		bar.setSelection((curr - min > max - curr) ? min : max);
>	}
>
>	/**
>	 * @param args
>	 */
>	public static void main(String[] args) {
>		final Display display = new Display();
>		Shell shell = new Shell(display);
>		shell.setLayout(new GridLayout());
>		final Snippet snippet = new Snippet(shell);
>		shell.open();
>		final Node[] elements = snippet.elements;
>		for (int i = 0; i < elements.length; i++) {
>			snippet.expandToLevel(elements[i], LEVEL);
>		}
>		snippet.autoExpand();
>		while (!shell.isDisposed()) {
>			if (!display.readAndDispatch())
>				display.sleep();
>		}
>		display.dispose();
>	}
>}

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Attachments on bug 305739: 161940 | 163972 | 164200 | 164264