Matlab - app designer - component name and callback
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Hi,
In App Designer
How can we know the name of a modified component when his callback is also connected to other component ?
Thks
2 个评论
Adam Danz
2019-8-21
Are you asking how to idenitify which component invoked a callback function in the case where multiple components are assigned the same callback function?
patrick bouche
2019-8-21
回答（1 个）
The 2nd input to a callback function in App Designer is "event'. event.Source is the handle to the object that invoked the callback function. event.EventName is the name of the event (a string).
objHandle = event.Source;
objName = event.EventName;
4 个评论
patrick bouche
2019-8-22
Guillaume
2019-8-22
Yes, EventName is the name of the event, and it's useful if the same callback is used to catch different types of events. It has nothing to do with what object triggered the callback,
However, as Adam said, the Source property is the handle to the object that triggered the callback so that's what you should use.
Adam Danz
2019-8-22
Objects don't really have names. However, you can assign most (all?) objects a name by assigning a string to their Tag property. Then you can identify the object by its tag like this
objHandle = event.Source;
objHandle.Tag
If you haven't assigned a Tag, the tag property will be empty.
René Lampert
2022-1-27
Hy Guillaume,
could you please explain in detail what you mean with " it's useful if the same callback is used to catch different types of events. " I dont get the point out of this phrase. Do you have a minimal example fot this?
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2019-8-21
2022-1-27
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