Comment 1 Silenio Quarti 2012-10-23 17:08:37 EDT

This is caused by

http://git.eclipse.org/c/platform/eclipse.platform.swt.git/commit/?id=f4412fc58eebec522777379819911580021557cf

Comment 2 Silenio Quarti 2012-10-25 11:22:09 EDT

I have removed the changes for the GTK2 code path. We cannot have this bug for next week M3 build.

http://git.eclipse.org/c/platform/eclipse.platform.swt.git/commit/?id=4de42eea287c8825d0a8fcad58d1afe3cfc7c290

Comment 3 Silenio Quarti 2012-11-06 17:22:25 EST

Fixed by using gdk_window_scroll() on GTK3.

http://git.eclipse.org/c/platform/eclipse.platform.swt.git/commit/?id=033543d2c530f3ef9e2efb7e2d0271a91bde3d81

Comment 4 Silenio Quarti 2012-11-07 15:17:59 EST

Scrolling seems to work after this fix, but there are still other problems. There is pixel corruption if a open an java editor and insert lines for example.

Comment 5 Grant Gayed 2013-01-30 15:36:27 EST

(In reply to comment #4)
> Scrolling seems to work after this fix, but there are still other problems.
> There is pixel corruption if a open an java editor and insert lines for
> example.

I just saw this, the lines above the cursor show problems when I press Enter in the Java Editor.

Comment 6 Grant Gayed 2013-01-30 15:37:12 EST

*** Bug 399545 has been marked as a duplicate of this bug. ***

Comment 7 Silenio Quarti 2013-04-29 15:24:59 EDT

Simple test case:

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.*;


public class ScrollTest {
public static void main(String[] args) {
	Display display = new Display();
	Shell shell = new Shell(display);

	final Canvas canvas = new Canvas(shell, SWT.NONE);
	canvas.setBounds(10, 10, 300, 300);
	
	final Color[] colors = new Color[]{
			display.getSystemColor(SWT.COLOR_RED),
			display.getSystemColor(SWT.COLOR_CYAN),
			display.getSystemColor(SWT.COLOR_GREEN),
			display.getSystemColor(SWT.COLOR_YELLOW),
			display.getSystemColor(SWT.COLOR_MAGENTA)
	};
	canvas.addListener(SWT.Paint, new Listener() {
		int i;
		public void handleEvent(Event event) {
			GC gc = event.gc;
			gc.setBackground(colors[i++ % colors.length]);
			gc.fillRectangle(-100, -100, 2000, 2000);
			gc.drawLine(event.x, event.y, event.x + event.width - 1, event.y + event.height - 1);
		}
	});
	
	canvas.addListener(SWT.MouseDown, new Listener() {
		public void handleEvent(Event event) {
			//DOWN
//			canvas.scroll(0, 17, 0, 0, 300, 300, true);

			//UP
//			canvas.scroll(0, 0, 0, 17, 300, 300, true);
			
			//ENTER
			canvas.scroll(0, 117, 0, 100, 300, 300, true);
		}
	});
	

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

Comment 8 Silenio Quarti 2013-04-29 15:26:41 EDT

The problem is that gtk_window_scroll () always scroll the whole window. Run the test case above against GTK2 and GTK3 too see the difference.

Fixed

http://git.eclipse.org/c/platform/eclipse.platform.swt.git/commit/?id=99e4edefe372e2c463379777ecf1fc5a600cb35b

Comment 9 Silenio Quarti 2013-04-30 10:48:10 EDT

I reverted my last change. They code only seems to work on Ubuntu 12.04.  There are different problems on Fedora 17, Fedora 18 and Ubuntu 12.10 (like black screens).

Comment 10 Silenio Quarti 2013-04-30 16:29:51 EDT

This patch works Fedora 17/18 and Ubuntu 12.04/12.10.

http://git.eclipse.org/c/platform/eclipse.platform.swt.git/commit/?id=8020477095f7384b8e5f566a5db9fc33a8794ffd