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

[Nicolás Papagna Maldonado]

Hi Juan!

Thanks for taking the time to look into this.

I've cloned the Cuis repo and was able to reproduce the artifacts that are
shown in the video link I shared in the previous email.

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:  (WidgetMorph new addMorph: label).

Tried running updated too, but that didn't work.

Am I missing something?

Best,
Nico PM

On Mon, Jul 26, 2021 at 4:03 PM Juan Vuletich <juan at jvuletich.org> wrote:

> Hi Nico,
>
> Your code works perfectly well on my pc on an updated Cuis. Maybe the bug
> you see has already been fixed?
>
> Cheers,
>
> --
> Juan Vuletichwww.cuis-smalltalk.orghttps://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Devhttps://github.com/jvuletichhttps://www.linkedin.com/in/juan-vuletich-75611b3
> @JuanVuletich
>
>
>
> On 7/25/2021 3:39 PM, Nicolás Papagna Maldonado via Cuis-dev wrote:
>
> 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
>
>

-- 

Nicolás Papagna
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