Scrollbar thumb sizing

[Isomorphic]

The previous customer's sample code from 2011 wasn't complete and had bugs - and perhaps there were framework bugs also, at that time.

Trying today, with a complete test-case, we see things work as expected, without errors.

Here's our test-case

// narrow stack
VStack stack = new VStack();
stack.setWidth(300);

// narrow layout, clipping content
VLayout layout = new VLayout();
layout.setWidth(300);
layout.setOverflow(Overflow.HIDDEN);

// but containing a wide canvas
Canvas c = new Canvas();
c.setWidth(500);
c.setBackgroundImage(Canvas.getImgURL("[SKINIMG]actions/edit.png"));
layout.addMember(c);

// scrollbar attached to the clipped layout
Scrollbar scrollbar = new Scrollbar();
scrollbar.setVertical(false);
scrollbar.setScrollTarget(layout);

stack.addMember(layout);
stack.addMember(scrollbar);
stack.draw();

[eschwegs]

on SmartClient Version: v12.1p_2021-10-22/PowerEdition Deployment (built 2021-10-22) : I can't get the Scrollbar to even draw. Using this example I get the following exception. Can you verify that for me. Thanks.

18:27:31.984:WARN:Log:Uncaught exception escaped: com.google.gwt.core.client.JavaScriptException
(TypeError) : Cannot read properties of undefined (reading 'create')
    at rmn_g$(Scrollbar.java:172)
    at Zd_g$(BaseWidget.java:745)
    at vw_g$(Layout.java:1871)

[bubus_company]

perhaps you have forget to add "setScrollTarget" or "setThumb" methods ?
I looked at Scrollbar.js ...

//> @attr scrollbar.scrollTarget (Canvas : null : [IRWA])
// The widget whose contents should be scrolled by this scrollbar. The scrollbar thumb
// is sized according to the amount of visible vs. scrollable content in this widget.
// @visibility external
//<

[bubus_company]

I want to add an Hscrollbar to a VStack and manual controll the scrolling.

VStack fooVstach = new VStack();
Scrollbar hTaskChartScroll = new Scrollbar();
hTaskChartScroll.setVertical(false);
hTaskChartScroll.setAutoEnable(false);
hTaskChartScroll.addScrolledHandler(new ScrolledHandler() {
public void onScrolled(ScrolledEvent event) {
GWT.log("scroll!!");
}
});
fooVstack.addMember(hTaskChartScroll);

Previous code correctly add the scrollbar, but the thumb is large as much as the width, so it doesn't scroll.

How to control the thumbSize?

[Smartgwt 2.5 + Gwt 2.3 + firefox/chrome]