Description Remy Suen 2009-06-06 09:05:14 EDT

Press the button to change the shell's background colour, nothing will happen. What is our strategy in terms of cleaning up styles (in this case, removing the gradient listener from the control)?

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final Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new GridLayout());

String style = "Shell { background-color: #202020 #373737 60% ";

new Button(shell, SWT.PUSH).addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {
		String style2 = "Shell { background-color: black ";

		CSSEngine engine = new CSSSWTEngineImpl(display);

		engine.setErrorHandler(new CSSErrorHandler() {
			public void error(Exception e) {
				e.printStackTrace();
			}
		});

		try {
			engine.parseStyleSheet(new StringReader(style2));
			engine.applyStyles(shell, true);
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}
});

CSSEngine engine = new CSSSWTEngineImpl(display);

engine.setErrorHandler(new CSSErrorHandler() {
	public void error(Exception e) {
		e.printStackTrace();
	}
});

try {
	engine.parseStyleSheet(new StringReader(style));
	engine.applyStyles(shell, true);
} catch (IOException e) {
	e.printStackTrace();
	return;
}

shell.setSize(400, 300);
shell.open();

while (!shell.isDisposed()) {
	if (!display.readAndDispatch())
		display.sleep();
}
display.dispose();