用户双击鼠标时产生的消息序列,下面正确的是()
WM_LBUTTONDOWN,WM_LBUTTONUP,WM_LBUTTONDOWN,WM_LBUTTONUP
WM_LBUTTONDOWN,WM_LBUTTONUP,WM_LBUTTONUP,WM_LBUTTONDBLCLK
WM_LBUTTONDOWN,WM_LBUTTONUP,WM_LBUTTONDOWN,WM_LBUTTONDBLCLK
WM_LBUTTONDOWN,WM_LBUTTONUP,WM_LBUTTONDBLCLK,WM_LBUTTONUP
双击即点击左键两下,第一次触发LBUTTONDOWN和LBUTTONUP,第二次点击时触发双击事件LBUTTONDBLCLK(doubleclick),放掉再触发LBUTTONUP