On 18 November 2012 08:53, Sebastian Nozzi <sebnozzi@gmail.com> wrote:
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:
http://jqueryui.com/draggable/#constrain-movement
(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:
drawOn: aCanvas 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?
yes. if i remember it called doLayoutIn: but it would be really nice, if someone would trace all the messages which going between morphs, and document the right protocol(s) to use and customize.
Thanks in advance!
Sebastian
-- Best regards, Igor Stasenko.