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Editorial Team
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Asked: 2026-05-18T12:40:38+00:00

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

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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 DirectX 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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  1. Editorial Team

    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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