Attachment 43642 Details for Bug 145624 – Snippet demonstrating the expand and collapse issues

Snippet demonstrating the expand and collapse issues

TreeSnippet.java (text/plain), 6.03 KB, created by Micah Hainline

on 2006-06-06 16:15:55 EDT

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Filename:

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Creator: Micah Hainline

Created: 2006-06-06 16:15:55 EDT

Size: 6.03 KB

patch

obsolete

>import java.util.ArrayList;
>import java.util.Collection;
>import java.util.List;
>
>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.SWT;
>import org.eclipse.swt.events.SelectionAdapter;
>import org.eclipse.swt.events.SelectionEvent;
>import org.eclipse.swt.layout.GridData;
>import org.eclipse.swt.layout.GridLayout;
>import org.eclipse.swt.widgets.Button;
>import org.eclipse.swt.widgets.Composite;
>import org.eclipse.swt.widgets.Display;
>import org.eclipse.swt.widgets.Label;
>import org.eclipse.swt.widgets.Shell;
>import org.eclipse.swt.widgets.Tree;
>
>public class TreeSnippet
>{
>	private static final int PARENTS = 100;
>	private static final int CHILDREN = 10;
>
>	void run()
>	{
>		Display display = new Display();
>		Shell shell = new Shell(display);
>		shell.setLayout(new GridLayout());
>		shell.setText("Tree Expand Snippet");
>
>		createVisuals(shell);
>
>		shell.open();
>
>		while (!shell.isDisposed())
>		{
>			if (!display.readAndDispatch())
>				display.sleep();
>		}
>
>		display.dispose();
>	}
>
>	/**
>	 * Creates the tree and buttons.
>	 * 
>	 * @param composite a composite
>	 */
>	private void createVisuals(Composite composite)
>	{
>		composite.setLayout(new GridLayout());
>		Label header = new Label(composite, SWT.WRAP);
>		header.setText("Test the Tree expand functionality"); //$NON-NLS-1$
>		header.setLayoutData(new GridData(SWT.FILL, SWT.DEFAULT, true, false));
>
>		// Create the tree viewer
>		final TreeViewer viewer = createTreeViewer(composite);
>
>		// Create the control buttons to expand and collapse the tree
>		createButtons(composite, viewer);
>
>		// Create and set the list of input TreeNodes
>		viewer.setInput(createInputList());
>	}
>
>	/**
>	 * Creates a new <code>TreeViewer</code> that handles a <code>List</code> of
>	 * <code>TreeNodes</code> as input.
>	 * 
>	 * @param composite a composite
>	 * @return the tree viewer
>	 */
>	private TreeViewer createTreeViewer(Composite composite)
>	{
>		final Tree tree = new Tree(composite, SWT.SINGLE);
>		final TreeViewer viewer = new TreeViewer(tree);
>
>		viewer.setContentProvider(new ITreeContentProvider()
>		{
>			public void inputChanged(Viewer p_viewer, Object p_oldInput, Object p_newInput)
>			{
>				// do nothing.
>			}
>
>			public void dispose()
>			{
>				// do nothing.
>			}
>
>			public Object[] getElements(Object p_inputElement)
>			{
>				if (p_inputElement instanceof Collection)
>				{
>					Collection list = (Collection) p_inputElement;
>					return list.toArray();
>				}
>				return new Object[] {};
>			}
>
>			public boolean hasChildren(Object p_element)
>			{
>				return !((TreeNode) p_element).children.isEmpty();
>			}
>
>			public Object getParent(Object p_element)
>			{
>				return ((TreeNode) p_element).parent;
>			}
>
>			public Object[] getChildren(Object p_parentElement)
>			{
>				return ((TreeNode) p_parentElement).children.toArray();
>			}
>
>		});
>		viewer.setLabelProvider(new LabelProvider()
>		{
>			public String getText(Object element)
>			{
>				return ((TreeNode) element).name;
>			}
>		});
>		tree.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
>		return viewer;
>	}
>
>	/**
>	 * Creates the expand and collapse buttons.
>	 * 
>	 * @param composite a composite
>	 * @param viewer the tree viewer
>	 */
>	private void createButtons(Composite composite, final TreeViewer viewer)
>	{
>		Button expandButton = new Button(composite, SWT.PUSH);
>		expandButton.setText("Expand the tree");
>		expandButton.setLayoutData(new GridData(SWT.DEFAULT, SWT.DEFAULT, false, false));
>		expandButton.addSelectionListener(new SelectionAdapter()
>		{
>			public void widgetSelected(SelectionEvent e)
>			{
>				viewer.expandAll();
>			}
>		});
>
>		Button expandFastButton = new Button(composite, SWT.PUSH);
>		expandFastButton.setText("Defer redraw and expand the tree");
>		expandFastButton.setLayoutData(new GridData(SWT.DEFAULT, SWT.DEFAULT, false, false));
>		expandFastButton.addSelectionListener(new SelectionAdapter()
>		{
>			public void widgetSelected(SelectionEvent e)
>			{
>				viewer.getTree().setRedraw(false);
>				viewer.expandAll();
>				viewer.getTree().setRedraw(true);
>			}
>		});
>
>		Button collapseButton = new Button(composite, SWT.PUSH);
>		collapseButton.setText("Collapse the tree");
>		collapseButton.setLayoutData(new GridData(SWT.DEFAULT, SWT.DEFAULT, false, false));
>		collapseButton.addSelectionListener(new SelectionAdapter()
>		{
>			public void widgetSelected(SelectionEvent e)
>			{
>				viewer.collapseAll();
>			}
>		});
>
>		Button collapseFastButton = new Button(composite, SWT.PUSH);
>		collapseFastButton.setText("Defer redraw and collapse the tree");
>		collapseFastButton.setLayoutData(new GridData(SWT.DEFAULT, SWT.DEFAULT, false, false));
>		collapseFastButton.addSelectionListener(new SelectionAdapter()
>		{
>			public void widgetSelected(SelectionEvent e)
>			{
>				viewer.getTree().setRedraw(false);
>				viewer.collapseAll();
>				viewer.getTree().setRedraw(true);
>			}
>		});
>	}
>
>	/**
>	 * @return a <code>List</code> of <code>TreeNodes</code>.
>	 */
>	private List createInputList()
>	{
>		List input = new ArrayList();
>		for (int i = 0; i < PARENTS; i++)
>		{
>			String parentName = "Parent " + new Integer(i).toString();
>			TreeNode parent = new TreeNode(null, parentName);
>			for (int j = 0; j < CHILDREN; j++)
>			{
>				String childName = "Child " + new Integer(j).toString() + " of " + parentName;
>				TreeNode child = new TreeNode(parent, childName);
>				parent.children.add(child);
>			}
>			input.add(parent);
>		}
>		return input;
>	}
>
>	public static void main(String[] args)
>	{
>		new TreeSnippet().run();
>	}
>
>	/**
>	 * Quick and dirty tree node class to use as input for the tree viewer.
>	 */
>	private class TreeNode
>	{
>		public final TreeNode parent;
>		public final List children;
>		public final String name;
>
>		public TreeNode(TreeNode parent, String name)
>		{
>			this.parent = parent;
>			this.name = name;
>			children = new ArrayList();
>		}
>	}
>}

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Attachments on bug 145624: 43642 | 44093