[Newbies] Constrained Morph dragging
sebnozzi at gmail.com
Sun Nov 18 11:53:08 UTC 2012
Hello Morphic experts,
I am learning / experimenting with Morphic and have the following question:
"How do I constrain the movement of a dragged Morph?"
As illustrated here:
(e.g. constrain within axis/container)
So far the "hack" I came up with was to aggresively re-position the
dragged Morph in its "drawOn:", if it is attached to a HandMorph:
self owner isHandMorph "is there a better way to ask: am I being dragged?"
ifTrue: [ self position: (self position x) @ 400 ].
super drawOn: aCanvas.
I am sure this solution is pretty bad... I also get visual artifacts
when I move the mouse up/down.
Are there better ways/hooks for this?
Generally: is there a method that is called on submorphs whenever the
parent Morph was re-positioned/re-sized?
Thanks in advance!
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