Initiates a drag on the source side. The function only needs to be used
when the application is starting drags itself, and is not needed when
drag_source_set() is used.
Table 3. Method parameters
targets
The targets (data formats) in which the source can provide the data.
actions
A bitmask of the allowed drag actions for this drag.
button
The button the user clicked to start the drag.
event
The event that triggered the start of the drag.
User Contributed Notes gtk.gtkwidget.method.drag_begin.php
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