Hi,

"For your consideration".

Specifically, we are looking for touchscreen style "swipe" behavior on a Resource View.

Firstly - I expect this is too "out there" to be considered, but I thought I would mention it because of its potential usefulness.

Secondly, you *might* already have some already existing solution for this. Even better.

===================================

Background. We have a Swing product - so it is primarily aimed at desktop use - using keyboard and mouse as the main input devices.

However, for some customers we run in the cloud and use Remote Desktop to access the program. This also means that iPads and other Touchscreen devices can use our product. It is not optimised for touchscreens, but it is very usable and worthwhile for certain use cases.

Swing is not optimised for Touchscreens - and one of the drawbacks is the difficulty in using scroll bars. We have *lots* of JTables in our product, which could be a usability problem for Touchscreens, but we have employed a single 60 lines of code to make it all work perfectly acceptably in many situations.

The problem is being able to "swipe" the screen to move a component (such as an AwtCalendar).

We use a DragScrollHandler (see code below - all 60 lines of it) that listens for mouse presses and drags, and moves the component in the viewport.

For each (say) JTable we add a single line of code as follows to make this work ...
JTable table = new JTable(tableData);
DragScrollHandler.createDragScrollHandlerFor(table);

The JTable then works exactly as expected on an iPad.

I know that the situation is more complex on a AwtCalendar (components within components), but we would find it extremely useful if it could be made to work.

So this is no more than a passing suggestion - but it is *possibly* not too difficult, and lots of cross platform developers might find it quite useful.

Thanks for listening.
-Damian


===================================
package ourpackage.utils;

import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JComponent;
import javax.swing.SwingUtilities;

public class DragScrollHandler extends MouseAdapter {

private JComponent component;
private Point pressedPoint, draggedPoint;
private Rectangle visiRect;

@SuppressWarnings("LeakingThisInConstructor")
public DragScrollHandler(JComponent c) {
component = c;
c.addMouseListener(this);
c.addMouseMotionListener(this);
}

@SuppressWarnings("ResultOfObjectAllocationIgnored")
public static void createDragScrollHandlerFor(JComponent component) {
new DragScrollHandler(component);
}

public void dispose() {
component.removeMouseListener(this);
component.removeMouseMotionListener(this);
}

@Override
public void mousePressed(MouseEvent e) {
pressedPoint = e.getPoint();
draggedPoint = e.getPoint();
visiRect = component.getVisibleRect();
}

@Override
public void mouseDragged(MouseEvent e) {
draggedPoint = e.getPoint();
visiRect.x += (pressedPoint.x - draggedPoint.x);
visiRect.y += (pressedPoint.y - draggedPoint.y);
component.scrollRectToVisible(visiRect);
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
Rectangle newRect = component.getVisibleRect();
pressedPoint.x += newRect.x - visiRect.x;
pressedPoint.y += newRect.y - visiRect.y;
visiRect = newRect;
}
});
}
}

BINGO! This works out of the box.

I can't test it on a touchscreen for a few days, but the mouse version does everything I hoped for, and I have a 99% confidence factor.

As always, the service is beyond the call of duty.

Many thanks,
-Damian