gtk:gesture-single, gtk:gesture, gtk:event-controller, gobject:object, common-lisp:standard-object, common-lisp:t

The gtk:gesture-drag class is a gtk:gesture implementation that recognizes drag operations. The drag operation itself can be tracked throught the "drag-begin", "drag-update" and "drag-end" signals, or the relevant coordinates be extracted through the gtk:gesture-drag-offset and gtk:gesture-drag-start-point functions.

The "drag-begin" signal

lambda (gesture xstart ystart)    :run-last      

gesture

The gtk:gesture-drag object which received the signal.

xstart

The double float with the x coordinate, relative to the widget allocation.

ystart

The double float with the y coordinate, relative to the widget allocation.

The signal is emitted whenever dragging starts.

The "drag-end" signal

lambda (gesture xoffset yoffset)    :run-last      

gesture

The gtk:gesture-drag object which received the signal.

xoffset

The double float with the x offset, relative to the start point.

yoffset

The double float with the y offset, relative to the start point.

The signal is emitted whenever the dragging is finished.

The "drag-update" signal

lambda (gesture xoffset yoffset)    :run-last      

gesture

The gtk:gesture-drag object which received the signal.

xoffset

The double float with the x offset, relative to the start point.

yoffset

The double float with the y offset, relative to the start point.

The signal is emitted whenever the dragging point moves.