| /******************************************************************************* |
| * Copyright (c) 2000, 2006 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.snippets; |
| |
| /* |
| * Tree example snippet: Draw a custom gradient selection |
| * |
| * For a list of all SWT example snippets see |
| * http://www.eclipse.org/swt/snippets/ |
| * |
| * @since 3.2 |
| */ |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.layout.FillLayout; |
| import org.eclipse.swt.widgets.*; |
| |
| public class Snippet226 { |
| |
| public static void main(String [] args) { |
| final Display display = new Display(); |
| Shell shell = new Shell(display); |
| shell.setText("Custom gradient selection for Tree"); |
| shell.setLayout(new FillLayout()); |
| final Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION); |
| tree.setHeaderVisible(true); |
| tree.setLinesVisible(true); |
| int columnCount = 4; |
| for (int i=0; i<columnCount; i++) { |
| TreeColumn column = new TreeColumn(tree, SWT.NONE); |
| column.setText("Column " + i); |
| } |
| int itemCount = 3; |
| for (int i=0; i<itemCount; i++) { |
| TreeItem item1 = new TreeItem(tree, SWT.NONE); |
| item1.setText("item "+i); |
| for (int c=1; c < columnCount; c++) { |
| item1.setText(c, "item ["+i+"-"+c+"]"); |
| } |
| for (int j=0; j<itemCount; j++) { |
| TreeItem item2 = new TreeItem(item1, SWT.NONE); |
| item2.setText("item ["+i+" "+j+"]"); |
| for (int c=1; c<columnCount; c++) { |
| item2.setText(c, "item ["+i+" "+j+"-"+c+"]"); |
| } |
| for (int k=0; k<itemCount; k++) { |
| TreeItem item3 = new TreeItem(item2, SWT.NONE); |
| item3.setText("item ["+i+" "+j+" "+k+"]"); |
| for (int c=1; c<columnCount; c++) { |
| item3.setText(c, "item ["+i+" "+j+" "+k+"-"+c+"]"); |
| } |
| } |
| } |
| } |
| |
| /* |
| * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly. |
| * Therefore, it is critical for performance that these methods be |
| * as efficient as possible. |
| */ |
| tree.addListener(SWT.EraseItem, new Listener() { |
| public void handleEvent(Event event) { |
| if ((event.detail & SWT.SELECTED) != 0) { |
| GC gc = event.gc; |
| Rectangle area = tree.getClientArea(); |
| /* |
| * If you wish to paint the selection beyond the end of |
| * last column, you must change the clipping region. |
| */ |
| int columnCount = tree.getColumnCount(); |
| if (event.index == columnCount - 1 || columnCount == 0) { |
| int width = area.x + area.width - event.x; |
| if (width > 0) { |
| Region region = new Region(); |
| gc.getClipping(region); |
| region.add(event.x, event.y, width, event.height); |
| gc.setClipping(region); |
| region.dispose(); |
| } |
| } |
| gc.setAdvanced(true); |
| if (gc.getAdvanced()) gc.setAlpha(127); |
| Rectangle rect = event.getBounds(); |
| Color foreground = gc.getForeground(); |
| Color background = gc.getBackground(); |
| gc.setForeground(display.getSystemColor(SWT.COLOR_RED)); |
| gc.setBackground(display.getSystemColor(SWT.COLOR_LIST_BACKGROUND)); |
| gc.fillGradientRectangle(0, rect.y, 500, rect.height, false); |
| // restore colors for subsequent drawing |
| gc.setForeground(foreground); |
| gc.setBackground(background); |
| event.detail &= ~SWT.SELECTED; |
| } |
| } |
| }); |
| for (int i=0; i<columnCount; i++) { |
| tree.getColumn(i).pack(); |
| } |
| tree.setSelection(tree.getItem(0)); |
| shell.setSize(500, 200); |
| shell.open(); |
| while (!shell.isDisposed()) { |
| if (!display.readAndDispatch()) display.sleep(); |
| } |
| display.dispose(); |
| } |
| } |