ScaleStartEvent 继承自： Event[EventControlType]

Start payload for scale/transform interaction sequences.

属性

名称	类型	默认值	说明
local_focal_point	Offset	metadata={'data_field': 'lfp'}	The initial focal point of the pointers in contact with the screen, in local coordinates.
global_focal_point	Offset	metadata={'data_field': 'gfp'}	The initial focal point of the pointers in contact with the screen, in global coordinates.
pointer_count	int	metadata={'data_field': 'pc'}	The number of pointers being tracked by the gesture recognizer. Typically this is the number of fingers being used to pan the control using the gesture recognizer.
timestamp	Optional[Duration]	None	Recorded timestamp of the source pointer event that triggered the scale event. Could be None if triggered from proxied events such as accessibility.