Thread: Resizing MDI child windows

In an MDI MFC app, I load up bitmaps to display in child windows. I want to resize the child windows so that the bitmaps fit nicely in. The bitmaps are loaded from their files in CDocument::Serialize(). I was wondering, when is the best time to resize the child windows to fit the bitmaps?

But that means I have to resize each time I draw the bitmap. That will slow my program down.

I ended up putting the code in the WM_INITIALUPDATE message handler. Works fine now.

This might help....

Code:

//Rect is filled with bitmaps dimension, 
//use GetObject() if the bitmaps width and height are not known

//get the styles from the window
lStyle=GetWindowLong(hWnd, GWL_STYLE);
lExStyle=GetWindowLong(hWnd, GWL_EXSTYLE);

//send in the required client area and styles
AdjustWindowRectEx(&Rect, lStyle, bHasMenu, lExStyle);

//returned is the required window size so set the window to this size and bring to the front
SetWindowPos(hWnd, HWND_TOP, 0,0,Rect.right- Rect.left, Rect.bottom- Rect.top, SWP_NOMOVE);

Cheers, that's how I was doing it. It doesn't work 100% though, because the window that the bitmap is drawn to is actually a child window of the MDI ChildFrame, and thus the dimensions are a few pixels different. What I might do though is use GetWindowRect() on each window to calculate the exact dimensions required.