Method question

[Glen Bojsza]

Hi Peter,

This was my original approach but the problem is similar to what I find
here.

I only get partial information when I start the combination of clicking and
dragging the mouse from outside of the graphic --> across the graphic -->
outside of the graphic again.

Maybe the messages being triggered aren't being received. I will try other
combinations to see what happens.

thanks,

Glen

On Tue, Nov 9, 2010 at 12:38 PM, Peter Brigham MD <pmbrig at gmail.com> wrote:

> On Nov 9, 2010, at 1:48 PM, Glen Bojsza wrote:
>
>  I have a problem which I am not certain which method is valid or should be
>> used (with Rev / Livecode there are sometimes too many ways of achieving a
>> goal).
>>
>> I have a graphic on a card left 62 right 462.
>>
>> My objective is to allow a user to left click and drag across the graphic
>> as
>> if selecting a section of it.
>>
>> I need start left,top,right,bottom and end left,top,right,bottom.
>>
>> The only interest is knowing the start of the drag when inside the graphic
>> and the end of the drag inside the graphic... with the following caveats.
>>
>>
>>  - The user may start the drag either outside the graphic and then
>>  continue the drag into the graphic (which is the start point) or start
>> the
>>  drag inside the graphic which would be the start point.
>>  - The user may release the mouse button inside the graphic which
>>  indicates the stop point or release the mouse button outside the graphic
>>  where the stop point is at the point of the mouse leaving the graphic.
>>
>>
>> This seems like it should be simple but I am getting tied down but trying
>> to
>> over complicate it?
>>
>> This is for Windows and Linux .
>>
>> Any elegant or simple solutions out there?
>>
>
> Would this do it?
>
> local uStartPoint, uEndPoint
>
> on mouseenter
>   if the mouse is down then
>       put the mouseloc into uStartPoint
>   end if
> end mouseenter
>
> on mouseleave
>    if the mouse is down then
>       put the mouseloc into uEndPoint
>   end if
> end mouseleave
>
> on mousedown
>   put the mouseloc into uStartPoint
> end mousedown
>
> on mouseup
>   put the mouseloc into uEndPoint
> end mouseup
>
> Then use the script local variables in whatever handlers for your own
> purposes.
>
> -- Peter
>
> Peter M. Brigham
> pmbrig at gmail.com
> http://home.comcast.net/~pmbrig <http://home.comcast.net/%7Epmbrig>
>
>
>
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