A picker button allows you to identify an arbitrary location on the screen.
Events
The following messages are sent by FXPicker to
its target:
SEL_CHANGED: | sent continuously while the position is changing; the message data is an FXPoint instance indicating the current root window
position of the mouse pointer.
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SEL_COMMAND: | sent when the left mouse button is clicked the second time (i.e. to
"pick" a position); the message data is an FXPoint instance indicating the picked position in
root window coordinates.
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