Force Touch events
非标准
该特性是非标准的,请尽量不要在生产环境中使用它!
Force Touch events are a proprietary, Apple-specific feature which makes possible (where supported by the input hardware) new interactions based on how hard the user clicks or presses down on the touchscreen or trackpad.
Events
webkitmouseforcewillbegin
- This event is fired before the
mousedown (en-US)
event. Its main use is that it can beEvent.preventDefault()
ed. webkitmouseforcedown
- This event is fired after the
mousedown (en-US)
event as soon as sufficient pressure has been applied for it to qualify as a "force click". webkitmouseforceup
- This event is fired after the
webkitmouseforcedown
event as soon as the pressure has been reduced sufficiently to end the "force click". webkitmouseforcechanged
- This event is fired each time the amount of pressure changes. This event first fires after the
mousedown (en-US)
event and stops firing before themouseup (en-US)
event.
Event properties
The following property is known to be available on the webkitmouseforcewillbegin
, mousedown (en-US)
, webkitmouseforcechanged
, webkitmouseforcedown
, webkitmouseforceup
, mousemove (en-US)
, and mouseup (en-US)
event objects:
MouseEvent.webkitForce
(en-US) 只读- 当前施加于触控板/触摸屏的压力量
常量
这些常数对于确定由MouseEvent.webkitForce
(en-US)指示的压力的相对强度是有用的:
MouseEvent.WEBKIT_FORCE_AT_MOUSE_DOWN
(en-US) 只读- 正常点击所需的最小力量
MouseEvent.WEBKIT_FORCE_AT_FORCE_MOUSE_DOWN
(en-US) 只读- 强制点击所需的最小力量
产品规格
不是任何规格的一部分。苹果在Mac开发者图书馆有一个描述。