[squeak-dev] Event handling challenges
karl ramberg
karlramberg at gmail.com
Mon Jun 15 14:44:33 UTC 2020
As for the TextMorphXX.
Do you want the TextMorphXX to behave like a StringMorph, eg. editing will
not activate on mouse over/ move events ?
tex := StringMorph new
contents: 'XXX';
borderWidth: 1;
color: Color red;
extent: 100 at 100.
tex openInHand.
On Mon, Jun 15, 2020 at 2:44 PM Trygve Reenskaug <trygver at ifi.uio.no> wrote:
> Hi Squeakers,
> My SRE context browser is a tool for drawing a snapshot of a selected
> structure of interlinked objects where each object is shown as a
> rectangular symbol. This diagram shows an object with its class and
> superclass objects:
>
>
> SRE has worked for years, last in 'Squeak3.10.2'. In 'Squeak5.3', the same
> program went into an infinite loop. It transpired that *myClass>>processEvent:
> anEvent using: defaultDispatcher* had become a new thing called an event
> filter and needed to return an Event or a Symbol. That problem fixed; the
> program still misbehaves. The problem seems to be with event handling. I
> have never been into that corner of Smalltalk but have read some Squeak
> documentation. I have not found any concrete code. I realize that I will
> never understand Squeak's event handling by reading code, code comments,
> and even the documentation I have found. There has apparently been a
> significant increase in complexity lately. An example: In 3,10,2, class *MorphicEventDispatcher
> *has 4 methods. In 5,3, it has 16.
>
> Here's the beginning of my challenges with 5.3: I find two anomalies in a
> diagram with just one symbol:
>
> 1. When I move some other window to a position within the diagram,
> the diagram grabs it and makes it a submorph of itself. In 3.10.2, the
> diagram ignores it.
> 2. The cursor becomes a text cursor when I move the mouse across a
> symbol.
>
> I have no explanation for either anomaly. My SRE code is a kludge and is
> almost unreadable. It is hard to formulate a question without the whole
> code as a background, and I have tried to reproduce them in a simple
> example. I managed to reproduce the first, but not the second anomaly. In a
> workspace, copy, select, and do it. The XXX-symbol becomes attached to the
> cursor, and I place it in the blue background.
>
> joe := PasteUpMorph new color: Color lightBlue.
> joe bounds: (500 at 400 corner: 800 at 600).
> joe dropEnabled: true.
> joe openInWorld.
> circle := CircleMorph new.
> joe addMorphCentered: circle.
> tex := TextMorphXX new
> contents: 'XXX';
> borderWidth: 1;
> color: Color red;
> extent: 100 at 100.
> tex openInHand.
>
> There is only one method in class TextMorphXX (sco TextMorph):
>
> processEvent: anEvent using: defaultDispatcher
> ^#rejected
>
>
>
> I move some background window, actually a collapsed Monticello thing, to
> Joe's position, Joe grabs it and makes it into a submorph. Any hints about
> how to proceed will be greatly appreciated.
> --Trygve
>
>
>
>
>
>
> --
>
> *The essence of object orientation is that objects collaborate to achieve
> a goal. *
> Trygve Reenskaug mailto: trygver at ifi.uio.no <%20trygver at ifi.uio.no>
> Morgedalsvn. 5A http://folk.uio.no/trygver/
> N-0378 Oslo http://fullOO.info
> Norway Tel: (+47) 468 58 625
>
>
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