Attachment 173971 Details for Bug 310112 – Changed Snippet v01 to help reproduce the problem

Changed Snippet v01 to help reproduce the problem

TreeViewerSnippet.java (text/x-java-source), 5.99 KB, created by Mário Guimarães

on 2010-07-11 07:51:58 EDT

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Description:

Filename:

MIME Type:

Creator: Mário Guimarães

Created: 2010-07-11 07:51:58 EDT

Size: 5.99 KB

patch

obsolete

>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.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.Shell;
>
>/**
> * A simple TreeViewer to demonstrate usage
> * 
> * 
> */
>public class TreeViewerSnippet {
>	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) {
>			//----------------------------------------------------------------------------
>			// REQUIREMENT: MyModel2 objects appear in the view only if they have children
>			//----------------------------------------------------------------------------
>			if (element instanceof MyModel1) {
>				MyModel1 elemObj = (MyModel1) element;
>				if (elemObj.child.size() == 0) return false;
>				MyModel2 childObj = (MyModel2)(elemObj.child.get(0));
>				return childObj != null && childObj.child.size() > 0;	
>			} else 
>				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 class MyModel1 extends MyModel {
>		public MyModel1(int counter, MyModel parent) {
>			super(counter, parent);
>		}
>	}
>	
>	public class MyModel2 extends MyModel {
>		public MyModel2(int counter, MyModel parent) {
>			super(counter, parent);
>		}
>	}
>	
>	public class MyModel3 extends MyModel {
>		public MyModel3(int counter, MyModel parent) {
>			super(counter, parent);
>		}
>	}
>
>	public TreeViewerSnippet(Shell shell) {
>		final TreeViewer viewer = new TreeViewer(shell);
>		viewer.setLabelProvider(new LabelProvider());
>		viewer.setContentProvider(new MyContentProvider());
>		final MyModel input = createModel();
>		viewer.setInput(input);
>		viewer.getControl().setLayoutData(new GridData(GridData.FILL_BOTH));
>		Button button1 = new Button(shell, SWT.PUSH);
>		button1.setText("Refresh");
>		button1.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
>		button1.addSelectionListener(new SelectionListener() {
>			public void widgetSelected(SelectionEvent e) {
>				viewer.refresh(true);
>			}
>
>			public void widgetDefaultSelected(SelectionEvent e) {
>			}
>		});
>		final Button button2 = new Button(shell, SWT.PUSH);
>		button2.setText("Remove Item 0.0.0.0");
>		button2.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
>		button2.addSelectionListener(new SelectionListener() {
>			public void widgetSelected(SelectionEvent e) {
>				MyModel1 node = (MyModel1) input.child.get(0);
>				MyModel2 child2 = (MyModel2) node.child.get(0);
>				if (child2.child.size() > 0) {
>					child2.child.clear();
>					button2.setText("Add Item 0.0.0.0");
>				} else {
>					createChildren3(child2, 1);
>					button2.setText("Remove Item 0.0.0.0");
>				}
>				viewer.refresh(true);
>			}
>
>			public void widgetDefaultSelected(SelectionEvent e) {
>			}
>		});
>
>	}
>
>	private MyModel createModel() {
>		MyModel root = new MyModel(0, null);
>		root.counter = 0;
>		createChildren1(root, 2);
>		MyModel1 child1 = (MyModel1) root.child.get(0);
>		createChildren2(child1, 1);
>		MyModel2 child2 = (MyModel2) child1.child.get(0);
>		createChildren3(child2, 1);
>		return root;
>	}
>	
>	protected void createChildren1(MyModel root, int count) {
>		MyModel tmp;
>		for (int i = 0; i < count; i++) {
>			tmp = new MyModel1(i, root);
>			root.child.add(tmp);
>		}
>	}
>	
>	protected void createChildren2(MyModel root, int count) {
>		MyModel tmp;
>		for (int i = 0; i < count; i++) {
>			tmp = new MyModel2(i, root);
>			root.child.add(tmp);
>		}
>	}
>	
>	protected void createChildren3(MyModel root, int count) {
>		MyModel tmp;
>		for (int i = 0; i < count; i++) {
>			tmp = new MyModel3(i, root);
>			root.child.add(tmp);
>		}
>	}
>
>	public static void main(String[] args) {
>		Display display = new Display();
>		Shell shell = new Shell(display);
>		shell.setLayout(new GridLayout());
>		new TreeViewerSnippet(shell);
>		shell.open();
>
>		while (!shell.isDisposed()) {
>			if (!display.readAndDispatch())
>				display.sleep();
>		}
>
>		display.dispose();
>	}
>}

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Attachments on bug 310112: 173778 | 173971 | 174065