Multi-touch API

Dr. Michael Paus mp at
Fri May 25 01:20:12 PDT 2012

I like this idea but in this context we should then also support a zoom 
function. When you can pan
a pane you most certainly also want to zoom in and out. This can be 
achieved by a gesture or
via the mouse wheel but so far I have not been able to get that working 
with a scrollpane.

Am 25.05.2012 10:04, schrieb Tom Eugelink:
> It's about default behavior and uniform UI. Naturally everyone can
> code their own dragging, but it would be great if certain things came
> out of the box. If you pull a ScrollPane from the toolbox, it is
> default setup to scroll by using the scrollbars. This is not the way
> this is done when using touch, then you would use a drag. So there is
> a difference between the default behavior.
> I found that I'm preferring to use the touch behavior when navigating
> with the mouse as well and actually am annoyed when I need to click
> the scrollbars. So I am trying to make a point to maybe get the mouse
> and touch behavior as similar as possible. This would mean that, for
> example, a scroll pane would default run in the pannable mode (I'm
> ashamed to admit that I have not done enough JFX UI to know that it
> existed).
> My discussion about the marker example is to indicate that I
> understand that making a the scrollpane pannable, may cause problems
> when there are things inside the pane that also want to drag. But
> maybe it is possible to have the scrollpane first check if there is
> any contents that would like to react to the drag, and if not then the
> scrollpane itself can process it.
> Am I making myself more clear?
> Tom
> On 2012-05-25 09:49, Pavel Safrata wrote:
>> Hello Tom,
>> I think I didn't really get the issue. You can install mouse dragging
>> event handlers on the map and on the marker. Why is that not
>> sufficient? Or do you want that specifically for our ScrollPane?
>> There is a "pannable" property that makes the scrollpane react on
>> mouse dragging. If you register a dragging handler that consumes the
>> event on any of its children, it is not propagated to the pane, so it
>> doesn't scroll. Is that insufficient?
>> Thanks,
>> Pavel
>> On 24.5.2012 16:37, Tom Eugelink wrote:
>>> The topic is too complex for me to provide any reasonable feedback
>>> at this time.
>>> I do have a question though; I find myself dragging scrollpane
>>> contents with my mouse lately, mimicking a finger slide, because it
>>> feels very natural to do. Google Maps does support this kind of
>>> navigation with a mouse (you can drag the map around), but a lot of
>>> applications do not, and one has to go to the scrollbars and start
>>> clicking. I understand that this actually makes sense, because the
>>> contents of the scrollpane may want to react to dragging. Google
>>> Maps solves this by differentiating where you click; on a marker
>>> (drag in the pane) or on the map (drag the pane itself). It may be
>>> efficient to have cross platform interaction to have viewports
>>> support this difference in UI and allow a mouse to work like a
>>> finger. Just braindumping.
>>> Tom

Dr. Michael Paus, Chairman of the Java User Group Stuttgart e.V. (JUGS).
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