On 10 Sep 2005, at 08:37, Richard Gaskin wrote:
I'm making a specialized drawing tool, and I need to know when the
mouse is clicked outside of any control while the pointer tool is
active -- here's my setup:
The card has a group which is used as the drawing region. I also
have another group which is used for tools, and the cantSelect of
those tool buttons is set to true in order to have them behave like
the browse tool when the pointer tool is active.
Some of the objects in my drawing region group are selectable as
normal, and others have their cantSelect set to true as they're
mostly managed by script in response to things the user does with
the selectable objects.
When the user clicks on one of these non-selectable objects I
change its appearance to indicate that it's selected.
Now here's the challenge: When the user clicks off of any control
I need notification so I can change the appearance of those objects.
We get this behavior for free with normally selectable objects:
you click on it and it's selected, you click off of it and it's
deselected.
But in order to manage my non-selectable objects, I need to know
when the mouse is clicked anywhere outside of a control.
Apparently the mouseDown and mouseUp messages are not sent when the
pointer tool is active unless the user clicks with button 3; the
normal button 1 click never sends the message to the card. Unlike
SuperCard, we have no pointerDown or pointerUp message which would
make this a snap.
I've tried placing a graphic object at the back of my group to trap
messages like that, but if I leave it with the cantSelect off it's
selectable, and if I turn on the cantSelect then dragging on it
gives the browse tool behavior rather than the pointer tool
behavior of the selection marquee. Suppporting the normal behavior
of marquee selection is important and I don't want to sacrifice it
just to work around the lack of mouseDown or mouseUp.
Any other suggestions for identifying when the user clicks outside
of any control on a card while the pointer tool is active?
Is there any way of using a "dummy object" (perhaps off screen) that
you select by script when you set the appearance of the non-
selectable objects. Then when you click off the control, you could
trap for a selectedObjectChanged message as the "dummy object" is
unselected. (I haven't thought this through at all. No doubt it's
full of holes.)
Cheers
Dave
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