[General] Attaching Events Handlers to Morphs is Not Obvious

Philip Weaver philmaker at gmail.com
Tue Feb 24 13:08:09 CET 2009

What's very confusing about the inspector is that the area on the right is
editable. If properties on the right are not persistable, then the right
should probably not be editable. I think I understand better.

So to alter an instance or class of a morph, a user must enter code in the
bottom area of the inspector window? And then do what: accept changes?
evaluate as JavaScript?

On Tue, Feb 24, 2009 at 2:58 AM, Robert Krahn <
robert.krahn at student.hpi.uni-potsdam.de> wrote:

> How do I attach a mouse handler to a morph?
> Open an inspector on a morph then, to attach a new submorph on every click
> e.g., type something like this:
> // make sure the Morph really wants the event
> this.handlesMouseDown = Functions.True;
> // overwrite my onMouseDown method
> this.onMouseDown = function (evt) {
> var localPoint = this.localize(evt.mousePoint);
> var new Morph = Morph.makeRectangle(localPoint.extent(pt(10,10)));
> this.addMorph(); // because we manually define a method
> }.bind(this);
> Other Mouse handler methods: onMouseMove, onMouseUp
> Most of the time I have no idea what can be edited in the inspector: for
> instance how would I edit [object Object]?.
> Multiple possibilities, assume x is an object
> - If you have an instance of a class and want to know its methods
> x.constructor.functionNames() // constructor is the klass
> - If you have an object (instance or normal JS object) try
> Object.keys(x);
> Object.values(x);
> for (var name in x) { console.log(name + ': ' + x[name]) }
> - If you want to look at the source code open the SystemBrowser
> In Core.js e.g. the fundamental parts of Morphic are defined.
> You can also hit loadAll. Then enter in a TextMorph 'onMouseDown', select
> it and hit alt+w. You will get a list of all occurrences of onMouseDown in
> the source code.
> Robert
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