Friday, April 8, 2011

Always-in-front dialogs

Is there a way to create a modeless dialog box in C++ MFC which always stays on top of the other windows in the application? I'm thinking sort of like the Find dialog in Visual Studio 2005 - where it stays on top, but you can still edit the underlying text.

(If it makes any difference, it's not MDI; it's a dialog-based app)

From stackoverflow
  • From Nish:

    Making your dialog stay on top

    Haven't you seen programs which have an "always-stay-on-top" option? Well the unbelievable thing is that you can make your dialog stay on top with just one line of code. Simply put the following line in your dialog class's OnInitDialog() function.

    SetWindowPos(&this->wndTopMost,0,0,0,0,SWP_NOMOVE|SWP_NOSIZE);
    

    Basically what we are doing is to use the SetWindowPos function to change the Z-order of our dialog window. We make our dialog stay on top of all other windows by moving it to the top of the Z-order. Now even when you activate some other window, our window will stay on top. But I'd advise you to make sure you know exactly what you are doing when you do this, for it might annoy people if they can't get your window out of the way when they want to do that.

    As you mentioned in the comments, the above line makes the window sit on top of every application. You'll need to do

    SetWindowPos(&this->wndTop,0,0,0,0,SWP_NOMOVE|SWP_NOSIZE);
    

    To make a window sit on top of only your application.

    Smashery : This puts the window on top of absolutely everything (every other application) - is there a way to have it so that the window just stays on top of the application of which it is a part?
    Smashery : Found it: instead of &this->wndTopMost, I used &this->wndTop
    1800 INFORMATION : Keep in mind the things that could happen if two applications both create topmost windows - it is best to try to avoid using this if at all possible - also users can be annoyed by this behaviour

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