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/*******************************************************************************
* Copyright (c) 2000, 2007 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;
/*
* 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, new Listener() {
public void handleEvent(Event event) {
int itemIndex = table.indexOf((TableItem)event.item);
int rightX = (HIGHS[itemIndex] - SCALE_MIN) * clientWidth / SCALE_RANGE;
event.width = rightX;
}
});
table.addListener(SWT.EraseItem, new Listener() {
public void handleEvent(Event 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();
}
}
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