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The source code/******************************************************************************* * Copyright (c) 2006 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 - initial API and implementation *******************************************************************************/ package org.eclipse.jface.snippets.viewers; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.ITableLabelProvider; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.TableViewer; 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.graphics.Color; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.TableColumn; /** * Example how to update a viewer from a long running task * * @author Tom Schindl <tom.schindl@bestsolution.at> * */ public class Snippet046UpdateViewerFromBackgroundThread { private static Image[] images; 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 boolean finished; public MyModel(int counter) { this.counter = counter; } public String toString() { return "Item " + this.counter; } } public class MyLabelProvider extends LabelProvider implements ITableLabelProvider { public Image getColumnImage(Object element, int columnIndex) { if( columnIndex == 0 ) { return images[((MyModel)element).finished?0:1]; } return null; } public String getColumnText(Object element, int columnIndex) { return "Column " + columnIndex + " => " + element.toString(); } } private static Image createImage(Display display, int red, int green, int blue) { Color color = new Color(display,red,green,blue); Image image = new Image(display,10,10); GC gc = new GC(image); gc.setBackground(color); gc.fillRectangle(0, 0, 10, 10); gc.dispose(); return image; } public Snippet046UpdateViewerFromBackgroundThread(Shell shell) { final TableViewer v = new TableViewer(shell,SWT.BORDER|SWT.FULL_SELECTION); v.setLabelProvider(new MyLabelProvider()); v.setContentProvider(new MyContentProvider()); TableColumn column = new TableColumn(v.getTable(),SWT.NONE); column.setWidth(200); column.setText("Column 1"); column = new TableColumn(v.getTable(),SWT.NONE); column.setWidth(200); column.setText("Column 2"); final MyModel[] model = createModel(); v.setInput(model); v.getTable().setLinesVisible(true); v.getTable().setHeaderVisible(true); Button b = new Button(shell,SWT.PUSH); b.setText("Start Long Task"); b.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { final Thread t = new Thread() { public void run() { for( int i = 0; i < model.length; i++ ) { if( v.getTable().isDisposed()) { return; } final int j = i; v.getTable().getDisplay().asyncExec(new Runnable() { public void run() { model[j].finished = true; v.update(model[j], null); } }); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } }; t.start(); } }); } private MyModel[] createModel() { MyModel[] elements = new MyModel[10]; for( int i = 0; i < 10; i++ ) { elements[i] = new MyModel(i); } return elements; } /** * @param args */ public static void main(String[] args) { Display display = new Display (); images = new Image[2]; images[0] = createImage(display,0,255,0); images[1] = createImage(display,255,0,0); Shell shell = new Shell(display); shell.setLayout(new FillLayout()); new Snippet046UpdateViewerFromBackgroundThread(shell); shell.open (); while (!shell.isDisposed ()) { if (!display.readAndDispatch ()) display.sleep (); } for( int i = 0; i < images.length; i++ ) { images[i].dispose(); } display.dispose (); } } |
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