snippet034celleditorperrownewapi.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 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<[e-mail]> - initial API and implementation
 *     Wayne Beaton - bug 185540
 *******************************************************************************/

package org.eclipse.jface.snippets.viewers;

import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.ColumnLabelProvider;
import org.eclipse.jface.viewers.ComboBoxCellEditor;
import org.eclipse.jface.viewers.EditingSupport;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.TableViewerColumn;
import org.eclipse.jface.viewers.TextCellEditor;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;

/**
 * Snippet to present editor different CellEditors within one column in 3.2
 * for 3.3 and above please use the new EditingSupport class
 * 
 * @author Tom Schindl <[e-mail]>
 * 
 */
public class Snippet034CellEditorPerRowNewAPI {
	private class MyEditingSupport extends EditingSupport {
		private CellEditor textEditor;
		
		private CellEditor dropDownEditor;
		
		public MyEditingSupport(TableViewer viewer) {
			super(viewer);
			textEditor = new TextCellEditor(viewer.getTable());
			
			String[] elements = new String[10];
			
			for (int i = 0; i < 10; i++) {
				elements[i] = i+"";
			}
			
			dropDownEditor = new ComboBoxCellEditor(viewer.getTable(),elements);
		}

		protected boolean canEdit(Object element) {
			return ((MyModel) element).counter % 2 == 0;
		}

		protected CellEditor getCellEditor(Object element) {
			if( element instanceof MyModel2 ) {
				return dropDownEditor;
			} else {
				return textEditor;
			}
		}

		protected Object getValue(Object element) {
			if( element instanceof MyModel2 ) {
				return new Integer(((MyModel) element).counter);
			} else {
				return ((MyModel) element).counter + "";
			}
		}

		protected void setValue(Object element, Object value) {
			((MyModel)element).counter = Integer.parseInt(value.toString());
			getViewer().update(element, null);
		}
		
	}
	
	private class MyContentProvider implements IStructuredContentProvider {

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

		/*
		 * (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) {

		}

	}

	public class MyModel {
		public int counter;

		public MyModel(int counter) {
			this.counter = counter;
		}

		public String toString() {
			return "Item " + this.counter;
		}
	}

	public class MyModel2 extends MyModel {

		public MyModel2(int counter) {
			super(counter);
		}

		public String toString() {
			return "Special Item " + this.counter;
		}
	}
	
	public Snippet034CellEditorPerRowNewAPI(Shell shell) {
		final Table table = new Table(shell, SWT.BORDER | SWT.FULL_SELECTION);
		
		final TableViewer v = new TableViewer(table);
		v.getTable().setLinesVisible(true);
		
		TableViewerColumn column = new TableViewerColumn(v, SWT.NONE);
		column.getColumn().setWidth(200);
		column.setLabelProvider(new ColumnLabelProvider() {

			public String getText(Object element) {
				return element.toString();
			}
			
		});
		
		column.setEditingSupport(new MyEditingSupport(v));
		
		v.setContentProvider(new MyContentProvider());
		
		MyModel[] model = createModel();
		v.setInput(model);
	}

	private MyModel[] createModel() {
		MyModel[] elements = new MyModel[20];

		for (int i = 0; i < 10; i++) {
			elements[i] = new MyModel(i);
		}

		for (int i = 0; i < 10; i++) {
			elements[i+10] = new MyModel2(i);
		}
		
		return elements;
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Display display = new Display();
		Shell shell = new Shell(display);
		shell.setLayout(new FillLayout());
		new Snippet034CellEditorPerRowNewAPI(shell);
		shell.open();

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

		display.dispose();

	}

}