Re: Touchscreen Click and Drag

[Paul Davis <paul linuxaudiosystems com>]

On Fri, 2007-07-06 at 10:05 -0600, Aaron Geier wrote:
> Hello,
> 
> I’m new to the list and this is my first post.  I’ve taken over a
> gtkmm project from a previous person.  I’ve read through the
> documentation and am fairly familiar with the GUI, but am by no means
> an expert.
> 
> My situation is this:
> 
> I have an application where the user uses external hardware to change
> a channel value.  The hardware is a slider which can change the value
> from something like 0% to 100%.  Right now, this channel level (i.e.
> 25%) is displayed in a text box.  There are many channel values that
> can be changed.
> 
> 
> 
> I would like to be able to use a touch screen to “click and drag”
> across the channels on the GUI, thus being able to select multiple
> channels.  After selecting those channels, I would like to (either by
> a hardware slider or maybe a software slider) change the values of
> those channels “simultaneously” by moving 1 slider.
> 
> My question is this:
> 
> Is there a widget other than the text entries that I am currently
> using to display the channel levels that will allow me to select
> everything with a click and drag approach?  Right now when I click and
> drag, I can only do so within the text entry, not across multiple text
> entries.

i suspect you're thinking about this in the wrong way. i would be
planning on picking up a touch start event, enter+leave events for
widgets and the touch end event. then, armed with the information on
what was entered+left during the drag, change the selection.


--p

>