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ClistCtrl Sorting Header Refresh

Posted on 1998-05-17
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Medium Priority
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Last Modified: 2013-11-20
I need to change ClistCtrl sorting headers from time to time
I tried to:

1. SetRedraw(FALSE)
2. delete sorting headers
3. put new sorting headers
3. SetRedraw(TRUE)

Problem: I allways see headers being deleted
and drawn back again, How to hide these refresh????

but I still see
0
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Question by:tal031697
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8 Comments
 
LVL 4

Accepted Solution

by:
piano_boxer earned 600 total points
ID: 1311659
When you use the SetRedraw() function, you supresses drawing when the windows receives a WM_PAINT message, and it does not redraw what needs to be drawn after a SetRedraw(TRUE). Normaly you have to invalidate the client area after the SetRedraw() i order to see changes in a control.

I'll suggest that you try using the LockWindowUpdate()/UnlockWindowsUpdate() pair instead. When you call UnlockWindowUpdate(), windows will send the needed WM_PAINT messages to the windows automaticly.

If you still have the problem of seeing headers being deleted, try moving the UnlockWindowUpdate() call into a private message handler, so you can delay the update until all messages currently in the queue has been handled.

#define WM_MY_MESSAGE WM_APP+1

MyDrawFunction()
{
    ...
    LockWindowUpdate();
    // delete sorting headers etc.
    PostMessage(WM_MY_MESSAGE);
}

LRESULT CMyClass::MyHandler(WPARAM, LPARAM)
{
    UnlockWindowUpdate();
    return 0;
}
0
 
LVL 4

Expert Comment

by:piano_boxer
ID: 1311660
I forgot this:
In order to handle the WM_MY_MESSAGE message, and this line just above END_MESSAGE_MAP() in the .cpp file:

    ON_MESSAGE(WM_MY_MESSAGE, MyHandler)

and, add the declaration of the function to the class header

class MyClass...
{
    ...
    LRESULT MyHandler(WPARAM, LPARAM);
    ....
};
0
 

Author Comment

by:tal031697
ID: 1311661
Thanks.

LockWindowUpdate() did work!.
(I don't know why SetRedraw() didn't).


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LVL 4

Expert Comment

by:piano_boxer
ID: 1311662
One reason my be that SetRedraw() is supposed to be handled by the control by it self, and LockWindowUpdate() is handled internally by windows. (Windows queues up the WM_PAINT messages and sends them to the control when UnlockWindowUpdate() is called).
0
 

Author Comment

by:tal031697
ID: 1311663
Well...
After I swapped SetRedraw() with LockWindowUpdate()
I remembered why I did try this once back, but Abandoned this
approach.

!!!CALLING UnlockWindowUpdate() REFRESHES THE WHOLE DESKTOP!!!!

so right now I'm back with SetRedraw() again.

I still need help,any other suggestions....?
0
 
LVL 4

Expert Comment

by:piano_boxer
ID: 1311664
Hmmm, yes I'v seen this as well.

Here is a possible other solution:

Subclass the CListCtrl add a handler for the WM_PAINT message. Add a flag that determines if WM_PAINT messages are to be handled. Set this flag to false when you update the listctrl, and to true when done and call Invalidate() on the entire ListCtrl.


void CMyListCtrl::OnPaint(CDC* pDC)
{
     if(m_bDoDraw)
     {
         CListCtrl::OnPaint(pDC);
     }
}
0
 

Author Comment

by:tal031697
ID: 1311665
Nop!, it didn't work.

even with the 'bDoDraw' flag I can sea the headers
being deleted and added.

... 8-(
0
 
LVL 4

Expert Comment

by:piano_boxer
ID: 1311666
Could you post the code for 'delete sorting headers' and 'put new sorting headers' so that I can try some solutions?
0

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