Find a userdata in objects and childrens list and set an attribute of the object
Source position: mui.pas line 711
const MUIM_SetUData = $8042c920; |
DoMethod(obj, MUIM_Export, [UData: IPTR; Attr: LongWord; Value: LongWord]);
This method tests if the MUIA_UserData of the object contains the given UData and sets Attr to Value for itself in this case.
Altough this is not very useful for single objects, performing this method on objects that handle children can become very handy. In this case, all the children (any maybe their children) are tested against UData and all matching objects will get the attribute set.
If you e.g. want to clear several string gadgets in your applciation at once, you simply give them the same MUIA_UserData and use
Note: If you have many objects in your application, MUIM_SetUData may take quite long. You can limit the amount of time by performing the method not on the application but on the window or even on the group your gadgets are place in.
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Find a userdata in objects and childrens list and return the object |
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This method performs like MUIM_SetUData, but stop at first found object. |