cantSelect and graphics

[Graham Samuel]

Ho ho! You're right - thanks very much Scott. I read about disabled, but I thought it would grey out the underlying graphics: but it doesn't seem to affect their appearance. So here we go! I am thinking of putting a comment in the LC Dictionary.

Graham

On 9 Nov 2013, at 20:54, Scott Rossi wrote:

> Was surprised to find you're right.  Drawing doesn't seem to start on a
> cantSelect-ed object.
> 
> But if you set the disabled of the object to true, drawing should
> start/work as expected.
> 
> A good tip when you want to make a custom background in an app upon which
> you can draw, drag-select, etc: set the cantSelect and disabled properties
> of the underlying background object/s to true.
> 
> Regards,
> 
> Scott Rossi
> Creative Director
> Tactile Media, UX/UI Design
> 
> 
> 
> 
> On 11/9/13 10:11 AM, "Graham Samuel" <livfoss at mac.com> wrote:
> 
>> I think the following is true for a desktop app:
>> 
>> If a the graphic drawing tool is chosen, the user can't draw the graphic
>> if the drawing begins (the initial mouse down is positioned) on an object
>> whose cantSelect is set to true: for example, if there is a rectangle
>> with cantSelect set to true, you can't draw a new rectangle starting
>> exactly on one of the lines of the original one, even though the new
>> graphic is clearly on a higher layer than the original; and if the
>> original one is opaque, you can't draw within the original one's rect at
>> all. 
>> 
>> This has some very odd consequences for drawing apps where some kind of
>> non-selectable background exists, such as axes for a graph-drawing
>> program: in such a case you can't start drawing on the exact line of
>> either of the (non-selectable) axes. There may be a workaround but the LC
>> dictionary doesn't tell you what is.
>> 
>> Am I right about this, and is there a workaround? I think if there is,
>> it's something to do with 'mouseDown'...
>> 
>> TIA
>> 
>> Graham
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