[Cuis-dev] Morph render leftovers when dragging the mouse

[Nicolás Papagna Maldonado]

Friendly bump to see if anyone has a lead on this one :)

Thanks in advance,
Nico PM

On Tue, Jul 20, 2021 at 4:17 PM Nicolás Papagna Maldonado <
nicolas.papagna at gmail.com> wrote:

> Aloha folks!
>
> I've run into the following issue. I'll do my best to explain it with the
> following example.
>
> TL;DR see video reproducing the issue here:
> https://drive.google.com/file/d/1HikB46LCob-bf-W4LOnT_azH-0ohlB9I/view?usp=sharing
>
> Let's say I want to display the class name of a morph when I point to it.
> If I do this, everything works fine:
>
> label := UpdatingLabelMorph new
>     target: [
>         self runningWorld submorphs
>             detect: [ :morph | morph containsGlobalPoint: self
>  runningWorld activeHand morphPositionInWorld ]
>             ifFound: [ :morph | morph class name ]
>             ifNone: [ 'nothing here' ]
>     ];
>     getSelector: #value;
>     stepTime: 10.
>
> self
>     runningWorld
>     activeHand
>     attachMorphBeside: label.
>
> If I try to attach a morph that contains the label defined above (say I
> want to display something fancier, not just a label), then every time I
> drag the mouse the label behaves like a "pen" leaving traces of its old
> renders on the canvas:
>
> self
>     runningWorld
>     activeHand
>     attachMorphBeside:  (WidgetMorph new addMorph: label).
>
> My gut feeling is that this might be related to the fact that the
> WidgetMorph that contains the label is not aware that it is rendered
> outside of its bounds, but I don't have much experience with Morphic.
>
> 1) Am I doing something wrong/missing an important concept for
> understanding how Morphic works?
> 2) Related to that: I often find myself wrapping a bunch of morphs to add
> behavior/glue code to them, but that wrapper does not do any rendering.
> What would be the right way to adjust the wrapper's extent to fit its
> submorphs perfectly (e.g. no extra space/no clipping)?
>
> Thanks in advance,
> Nico PM
>


-- 

Nicolás Papagna
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