I need to update one class data and the view during the idle, I used this
method in the Cdoc:
void CMyAppDoc::OnIdle(){
theClass->Update();
POSITION pos = GetFirstViewPosition();
CView* pView = GetNextView(pos);
pView->Invalidate(true);
pView->UpdateWindow();
}
It works only when I move the mouse, what's wrong? Z_Z
这个问题的确比较搞，要好好看mfc源码的，下面是我的回答method in the Cdoc:
void CMyAppDoc::OnIdle(){
theClass->Update();
POSITION pos = GetFirstViewPosition();
CView* pView = GetNextView(pos);
pView->Invalidate(true);
pView->UpdateWindow();
}
It works only when I move the mouse, what's wrong? Z_Z
Nothing is wrong, I can explain it is by design.
Please take a look at the source code of int CWinThread::Run(), in that function, IsIdleMessage() is called, and in IsIdleMessage() WM_PAINT is ignored, which means WM_PAINT will not cause OnIdle to be called, for windows think it's just a WM_PAINT message and will not change the UI.
Your UpdateWindow() only post a WM_PAINT message, the message queue is not empty but it's ignored by IsIdleMessage(), that's why.
But when you move your mouse, the message queue is filled with some WM_MOUSEMOVE and it's not ignored for the position changes. So your OnIdle() is called again.
-
My suggestion is to move your Invalidate & UpdateWindow code to somewhere else.
OnIdle（）的确是个有点复杂的问题，我可能还会写几篇文章 ：）
这里（http://groups.google.com/group/microsoft.public.vc.mfc/browse_thread/thread/14f20aa5ffd6994d/66b6e5949a31bfa2?lnk=st&q=AfxUnlockTempMaps&rnum=40&hl=zh-CN#66b6e5949a31bfa2）有篇文章讲的很到位