event.isMiddleButtonDown

概述

指示在鼠标事件发生时鼠标中键是否被按下。

注意事项

低于 4.0 版本的 Android 设备不支持鼠标中键。对于这些较旧的设备，此属性将始终设置为 false。

示例

-- Called when a mouse event has been received.
local function onMouseEvent( event )
    if event.isMiddleButtonDown then
        -- The mouse's middle button is currently pressed down.
    else
        -- The mouse's middle button is not being pressed.
    end
end
                             
-- Add the mouse event listener.
Runtime:addEventListener( "mouse", onMouseEvent )