godot-demo-projects/gui/drag_and_drop/drag_drop_script.gd

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extends ColorPickerButton
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func get_drag_data(pos):
# use another colorpicker as drag preview
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var cpb = ColorPickerButton.new()
cpb.set_color(get_color())
cpb.set_size(Vector2(50, 50))
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set_drag_preview(cpb)
# return color as drag data
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return get_color()
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func can_drop_data(pos, data):
return typeof(data) == TYPE_COLOR
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func drop_data(pos, data):
set_color(data)