Qt keyboard events with DirectX fullscreen

I need to display a full screen DirectX window from a Qt app.

Although directX isn't supported directly anymore by Qt this should be easy enough - just override QWidget, provide your own paintEvent() and set a WA_PaintOnScreen attribute.

But when the app is full screen D开发者_开发技巧irectX is grabbing all the mouse and keyboard inputs - so the only way out of the app is ctrl-alt-del.

ps. Even if I wrote DirectX keyboard handlers I would still have to find a way of creating the correct Qkeypress event to pass to Qt.

Has anyone done this? Or is there a simple way to tell DirectX not to grab the keyboard?

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To my knowledge Direct3D does not get the keyboard. Your problem more likely arises from the fact that Direct3D in full-screen is quite a different beast. Things like GDI (which Qt may well use to do rendering) do not work by default, the run-time hooks lots of bits of information. That info then, presumably, never manages to get to Qt. The options you have are to re-implement Qt to render using Direct3D (Lighthouse project?) or to use a pseudo full screen. This is usually done by creating a window that has a client area the same size as the screen and then positioning it correctly.

The latter would probably be the simplest solution ...

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There was an attempt to get a D3DWidget kind of thing in Qt 4.3-4.5 or something like that, but it never was stabilized or approved and later even removed.

Perhaps indeed lighthouse is an option (with a medium sized amount of work, basically links OS/DX stuff to Qt stuff) or you can take a look at the old direct3D code in older Qt branches. I never used it, and it probably isn't intended to use with recent versions of Qt, but it's better than nothing.