Mega Code Archive
Implement tab traversal (behave like a tab group)
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/*
* Canvas example snippet: implement tab traversal (behave like a tab group)
*
* For a list of all SWT example snippets see
* http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class Snippet21 {
public static void main(String[] args) {
Display display = new Display();
final Color red = display.getSystemColor(SWT.COLOR_RED);
final Color blue = display.getSystemColor(SWT.COLOR_BLUE);
Shell shell = new Shell(display);
Button b = new Button(shell, SWT.PUSH);
b.setBounds(10, 10, 100, 32);
b.setText("Button");
shell.setDefaultButton(b);
final Canvas c = new Canvas(shell, SWT.BORDER);
c.setBounds(10, 50, 100, 32);
c.addListener(SWT.Traverse, new Listener() {
public void handleEvent(Event e) {
switch (e.detail) {
/* Do tab group traversal */
case SWT.TRAVERSE_ESCAPE:
case SWT.TRAVERSE_RETURN:
case SWT.TRAVERSE_TAB_NEXT:
case SWT.TRAVERSE_TAB_PREVIOUS:
case SWT.TRAVERSE_PAGE_NEXT:
case SWT.TRAVERSE_PAGE_PREVIOUS:
e.doit = true;
break;
}
}
});
c.addListener(SWT.FocusIn, new Listener() {
public void handleEvent(Event e) {
c.setBackground(red);
}
});
c.addListener(SWT.FocusOut, new Listener() {
public void handleEvent(Event e) {
c.setBackground(blue);
}
});
c.addListener(SWT.KeyDown, new Listener() {
public void handleEvent(Event e) {
System.out.println("KEY");
for (int i = 0; i < 64; i++) {
Color c1 = red, c2 = blue;
if (c.isFocusControl()) {
c1 = blue;
c2 = red;
}
c.setBackground(c1);
c.update();
c.setBackground(c2);
}
}
});
Text t = new Text(shell, SWT.SINGLE | SWT.BORDER);
t.setBounds(10, 85, 100, 32);
Text r = new Text(shell, SWT.MULTI | SWT.BORDER);
r.setBounds(10, 120, 100, 32);
c.setFocus();
shell.setSize(200, 200);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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