event.isPrimaryButtonDown

概述

指示在鼠标事件发生时鼠标的主按钮是否被按下。

请注意，主按钮通常是鼠标左键，除非最终用户已将其与鼠标右键交换。

示例

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