| /******************************************************************************* |
| * Copyright (c) 2000, 2016 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.snippets; |
| |
| /* |
| * Table snippet: modify the clipping of custom background paints |
| * |
| * For a detailed explanation of this snippet see |
| * http://www.eclipse.org/articles/Article-CustomDrawingTableAndTreeItems/customDraw.htm#_example4 |
| * |
| * For a list of all SWT example snippets see |
| * http://www.eclipse.org/swt/snippets/ |
| * |
| * @since 3.2 |
| */ |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.widgets.*; |
| |
| public class Snippet273 { |
| |
| public static void main(String[] args) { |
| final String[] MONTHS = { |
| "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
| "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" |
| }; |
| final int[] HIGHS = {-7, -4, 1, 11, 18, 24, 26, 25, 20, 13, 5, -4}; |
| final int[] LOWS = {-15, -13, -7, 1, 7, 13, 15, 14, 10, 4, -2, -11}; |
| final int SCALE_MIN = -30; final int SCALE_MAX = 30; |
| final int SCALE_RANGE = Math.abs(SCALE_MIN - SCALE_MAX); |
| |
| Display display = new Display(); |
| Shell shell = new Shell(display); |
| shell.setBounds(10,10,400,350); |
| shell.setText("Ottawa Average Daily Temperature Ranges"); |
| final Color blue = display.getSystemColor(SWT.COLOR_BLUE); |
| final Color white = display.getSystemColor(SWT.COLOR_WHITE); |
| final Color red = display.getSystemColor(SWT.COLOR_RED); |
| // final Image parliamentImage = new Image(display, "./parliament.jpg"); |
| final Table table = new Table(shell, SWT.NONE); |
| table.setBounds(10,10,350,300); |
| // table.setBackgroundImage(parliamentImage); |
| for (int i = 0; i < 12; i++) { |
| TableItem item = new TableItem(table, SWT.NONE); |
| item.setText(MONTHS[i] + " (" + LOWS[i] + "C..." + HIGHS[i] + "C)"); |
| } |
| final int clientWidth = table.getClientArea().width; |
| |
| /* |
| * NOTE: MeasureItem and EraseItem are called repeatedly. Therefore it is |
| * critical for performance that these methods be as efficient as possible. |
| */ |
| table.addListener(SWT.MeasureItem, event -> { |
| int itemIndex = table.indexOf((TableItem)event.item); |
| int rightX = (HIGHS[itemIndex] - SCALE_MIN) * clientWidth / SCALE_RANGE; |
| event.width = rightX; |
| }); |
| table.addListener(SWT.EraseItem, event -> { |
| int itemIndex = table.indexOf((TableItem)event.item); |
| int leftX = (LOWS[itemIndex] - SCALE_MIN) * clientWidth / SCALE_RANGE; |
| int rightX = (HIGHS[itemIndex] - SCALE_MIN) * clientWidth / SCALE_RANGE; |
| GC gc = event.gc; |
| Rectangle clipping = gc.getClipping(); |
| clipping.x = leftX; |
| clipping.width = rightX - leftX; |
| gc.setClipping(clipping); |
| Color oldForeground = gc.getForeground(); |
| Color oldBackground = gc.getBackground(); |
| gc.setForeground(blue); |
| gc.setBackground(white); |
| gc.fillGradientRectangle(event.x, event.y, event.width / 2, event.height, false); |
| gc.setForeground(white); |
| gc.setBackground(red); |
| gc.fillGradientRectangle( |
| event.x + event.width / 2, event.y, event.width / 2, event.height, false); |
| gc.setForeground(oldForeground); |
| gc.setBackground(oldBackground); |
| event.detail &= ~SWT.BACKGROUND; |
| event.detail &= ~SWT.HOT; |
| }); |
| |
| shell.open(); |
| while (!shell.isDisposed()) { |
| if (!display.readAndDispatch()) display.sleep(); |
| } |
| // parliamentImage.dispose(); |
| display.dispose(); |
| } |
| } |