Window Drag / Blur

This is a discussion on Window Drag / Blur within the Windows Programming forums, part of the Platform Specific Boards category; Hi I have two quick questions, Ive attached two screenshots of my problems 1) When i drag the window - ...

  1. #1
    Registered User ventolin's Avatar
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    Question Window Drag / Blur

    Hi I have two quick questions,

    Ive attached two screenshots of my problems

    1) When i drag the window - i get this blur occuring (as shown) . How do i stop this from happening? Note im using openGL to do all the drawing. Is this the problem? Im using double buffering etc when drawing so it cant be this?

    2) Another similar problem:

    When i use the menu to click an command say "New"

    The menu stays in a permanent state of being dropped down, even tho i cant click it, how do i get rid of this?


    Thanks in advance!
    Attached Images Attached Images   

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    C++ Developer XSquared's Avatar
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    How often does your screen redraw?
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    Registered User ventolin's Avatar
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    For example when i click the New in the menu .. a dialog box pops up and focus is set to that. If i drag it for example it blurs the screen/leaves the menu still open until i close the dialog box.

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    Registered User ventolin's Avatar
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    is there a way to set focus to the parent window - so i can re-draw the scene each time a DialogBox calls WM_MOVING and then re-set focus back to that DialogBox or am i barking up the wrong tree?

    Edit:-

    Hm doesnt seem to work - im using OpenGL to do all the drawing - i cant seem to find anything to help me !
    Last edited by ventolin; 07-25-2004 at 06:57 PM.

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    Try to put all the drawing in OpenGl in WM_PAINT. That could work.

  6. #6
    erstwhile
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    Quote Originally Posted by ventolin
    For example when i click the New in the menu .. a dialog box pops up and focus is set to that. If i drag it for example it blurs the screen/leaves the menu still open until i close the dialog box.
    This is because the window client area is not being updated in response to WM_PAINT as ganonl has suggested. Put a call to whatever your opengl 'drawing/rendering' function is in a WM_PAINT handler.

    This will probably lead to a new problem - menu flicker (if you get to see the menu at all). The workaround for this is to handle WM_INITMENU and WM_EXITMENULOOP where you call ValidateRect and InvalidateRect respectively. Validating the client causes your opengl rendering to 'pause' allowing the menu to be drawn and invalidating resumes client area rendering. Something like:
    Code:
    case WM_PAINT:
      OpenGL_Drawing_Fn(); /*or whatever you've called it*/
      return 0;
    case WM_INITMENU:
      ValidateRect(hwnd,0);
      return 0;
    case WM_EXITMENULOOP:
      InvalidateRect(hwnd,0,0);
      return 0;
    This assumes a message loop using PeekMessage and not GetMessage.
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    Registered User ventolin's Avatar
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    Ok thanks for the responses, ill try these suggestions out

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