Dear fellow subscribers! I want to display the same QWebView in two different windows. I tried/considered these three different solutions but could not make any to work.
1\ Subclass QWebView, override paintEvent() and redirected() methods. The overriden redirected() will redirect drawing of the widget into a QPixmap and paintEvent will call the super function and then update the QLabels that display the drawn pixmap. This works. It has the disadvantage that it also brings up a black window of what used to be the WebView. So I need a way to hide that window but keep the WebView behaving like it is actually displayed. 2\ Call grab() on the WebView. I haven't figured out when to call it. I want to grab every time something on the page in WebView changes. I tried overriding paintEvent, tried to keep a flag whether it is doing a normal redraw or grab but I always ended up either crashing the app or with an infinite loop of draws. My best bet here is to just call grab() 30 times per second on the WebView from outside and hope it will be enough. i think it will. In both cases I'll have to somehow sort out resending events from the QLabels to the WebView. But I expect an EventFilter can be made to work for that. 3\ have two WebViews and synchronize the page inside using some HTML5 trickery in JavaScript. (as I am creating the HTML page so I have control over it). I know how to do this and I know it would work, but I do not like it and would prefer something in the lines of 1\ or 2\. I would much welcome any comments on it and possibly suggestions on in 1\ how to keep the cannibalised QWebView from showing on screen; in \2 how to avoid having to do a periodic grab() maybe some advice on the event resending business or possibly how to achieve my ultimate goal described bellow with some other means. Ultimate goal: I have a slide deck in HTML. I am playing with the idea to show it from my QT app instead of my regular browser to have more control over it and solve the following issue. The room i am presenting in has two projectors. In my presentation, I am showing slides or videos, switching between the two often. - When I am showing slides, I have the slide appear on both screens (so left and right half of the autience has it in front of their eyes). - When I am showing video, I am stretching it over both adjacent screens to give it a wall effect. That means that I am often switching between two setups -- web browser with slides + cloning my screen and Vlc with video + wall setting in vlc + two independent screens. This switching takes time and makes my presentation less smooth. Therefore, I want to have both "modes" of my presentation served from one app with the same screen settings. The slide synchronization would be possible to do in HTML5, but the video wall is not: In the future I would like to implement playing videos in the way that the left half of the video will be playing on the left screen and the right one on the right screen / fullscreen windows. The screens are adjacent to each other so I'll get a wall effect. That is something that is very likely undoable with just HTML5 in the browser (I tried and failed to either keep the left and right half in sync or to sustain good framerate) Thank you,
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