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默认情况下,窗口是不响应
WM_MOUSELEAVE
和
WM_MOUSEHOVER
消息的,所以要使用
_TrackMouseEvent
函数来激活这两个消息。调用这个函数后,当鼠标在指定窗口上停留超过一定时间或离开窗口后,该函数会
Post
这两个消息到指定窗口。
使用方法:
1.
在对话框类中定义一个变量来标识是否追踪当前鼠标状态,之所以要这样定义是要避免鼠标已经在窗体之上时,一移动鼠标就不断重复产生
WM_MOUSEHOVER
。
BOOL
_bMouseTrack=TRUE
;
2.
在
OnMouseMove
中调用
_TrackMouseEvent
函数
if (_bMouseTrack)
//
若允许
追踪,则。
{
TRACKMOUSEEVENT
csTME;
csTME.cbSize = sizeof
(csTME);
csTME.dwFlags = TME_LEAVE|TME_HOVER;
csTME.hwndTrack = m_hWnd
;//
指定要
追踪
的窗口
csTME.dwHoverTime = 10; //
鼠标在按钮上停留超过
10ms
,才认为状态为
HOVER
::_TrackMouseEvent
(&csTME); //
开启
Windows
的
WM_MOUSELEAVE
,
WM_MOUSEHOVER
事件支持
_bMouseTrack=FALSE
; //
若已经
追踪
,则停止
追踪
}
3.
在
OnMouseLeave
中再次允许追踪鼠标状态
_bMouseTrack=TRUE
;
4.
备注:这两个消息的映射要自己写
ON_MESSAGE(WM_MOUSEHOVER,OnMouseHover)
ON_MESSAGE(WM_MOUSELEAVE,OnMouseLeave)