snippet053starteditorwithcontextmenu.java

对于可视的桌面开发系统的一些详细的设计资料

/*******************************************************************************
 * Copyright (c) 2007 Marcel 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:
 *     Marcel <[e-mail]> - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.snippets.viewers;

import java.util.ArrayList;

import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.ColumnViewerEditor;
import org.eclipse.jface.viewers.ColumnViewerEditorActivationEvent;
import org.eclipse.jface.viewers.ColumnViewerEditorActivationStrategy;
import org.eclipse.jface.viewers.ICellModifier;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.TextCellEditor;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.TreeViewerEditor;
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.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TreeItem;

/**
 *
 */
public class Snippet053StartEditorWithContextMenu implements SelectionListener {

	private TreeViewer viewer;

	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 Snippet053StartEditorWithContextMenu(Shell shell) {
		viewer = new TreeViewer(shell, SWT.BORDER);
		viewer.setContentProvider(new MyContentProvider());
		viewer.setCellEditors(new CellEditor[] {new TextCellEditor(viewer.getTree())});
		viewer.setColumnProperties(new String[] { "name" });
		viewer.setCellModifier(new ICellModifier() {

			/* (non-Javadoc)
			 * @see org.eclipse.jface.viewers.ICellModifier#canModify(java.lang.Object, java.lang.String)
			 */
			public boolean canModify(Object element, String property) {
				return true;
			}

			/* (non-Javadoc)
			 * @see org.eclipse.jface.viewers.ICellModifier#getValue(java.lang.Object, java.lang.String)
			 */
			public Object getValue(Object element, String property) {
				return ((MyModel)element).counter + "";
			}

			/* (non-Javadoc)
			 * @see org.eclipse.jface.viewers.ICellModifier#modify(java.lang.Object, java.lang.String, java.lang.Object)
			 */
			public void modify(Object element, String property, Object value) {
				TreeItem item = (TreeItem)element;
				((MyModel)item.getData()).counter = Integer.parseInt(value.toString());
				viewer.update(item.getData(), null);
			}

		});

		TreeViewerEditor.create(viewer, new ColumnViewerEditorActivationStrategy(viewer) {
			protected boolean isEditorActivationEvent(ColumnViewerEditorActivationEvent event) {
				return event.eventType == ColumnViewerEditorActivationEvent.PROGRAMMATIC;
			}
		}, ColumnViewerEditor.DEFAULT);

		Menu menu = new Menu(viewer.getControl());
		MenuItem renameItem = new MenuItem(menu, SWT.PUSH);
		renameItem.addSelectionListener(this);
		renameItem.setText("Rename");
		viewer.getTree().setMenu(menu);

		viewer.setInput(createModel());
	}

	public void widgetDefaultSelected(SelectionEvent e) {
	}

	public void widgetSelected(SelectionEvent e) {
		IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();
		if (selection != null) {
			viewer.editElement(selection.getFirstElement(), 0);
		}
	}

	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 Snippet053StartEditorWithContextMenu(shell);
		shell.open ();

		while (!shell.isDisposed ()) {
			if (!display.readAndDispatch ()) display.sleep ();
		}

		display.dispose ();
	}
}