How to scroll to an offscreen canvas?

[cjustice]

This is probably obvious, but I'm having a heck of a time getting a widget off screen in the viewport to scroll into view. Assume I have VLayout with Overflow set to Auto, and I've added 3 members to it a, b, and c. Like this:

VLayout canvas = new VLayout();
canvas.setOverflow(Overflow.AUTO);
...
VLayout a = new VLayout();
..
canvas.addMember(a);
VLayout b = new VLayout();
..
canvas.addMember(b);
VLayout c = new VLayout();
..
canvas.addMember(c);

I'd then like to do something like:

canvas.scrollTo(c)

that would scroll down to c bringing it into view. How do I do this?

Thanks!

[Isomorphic]

If you're placing it offscreen at negative left or top coordinates, it cannot be scrolled to (by design: browsers won't do this, and it violates relevant specs).

[cjustice]

I want to do the opposite - panel c is scrolled out of view, and I want to programatically scroll it back into view. I can get it to scroll down toward member c by calling

canvas.scrollTo(0, 200);

However, I don't know how far to scroll it.

Thanks!
Chris

[Isomorphic]

You can use getLeft() / getTop() / getWidth() / getHeight() to figure out the coordinates of the target canvas, and scroll to the appropriate spot based on these (so at the simplest just parentWidget.scrollTo(childWidget.getLeft(), childWidget.getTop());)