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Qt+Cef integration on Linux

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  • mrjjM mrjj

    @antofik
    Well is it make for linux?
    http://magpcss.org/ceforum/apidocs3/projects/(default)/_cef_window_info_t.html
    Really seems windows-ish for me using HWND and DWORD
    Also on the download page
    https://code.google.com/archive/p/chromiumembedded/downloads
    I see no linux?
    Of Course it works on linux too but if u check out the
    cef_window_handle_t ( right click and go to definition)
    is that also using DWORD and HWND or what is the internals in your version?

    A Offline
    A Offline
    antofik
    wrote on last edited by
    #9

    @mrjj
    Yes, it fully supports Linux. Moreover, it is even embeddable into Qt. But unfortunately there are no open examples.
    Here https://bitbucket.org/chromiumembedded/cef/src/master/tests/cefclient/cefclient_gtk.cc?at=master&fileviewer=file-view-default you could find an example how to do it with Gtk+. Now, I need to somehow connect Qt and Cef with or without Gtk+ intermediate layer.

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    • mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #10

      Ok, but since you are using the
      win->winId()
      That will give you the native handle for a window for the display/deskop manager you are using. ( AFAIK)
      So if NOT gtk as your desktop, will it then work with Cef ?
      Are you on KDE or what linux ?

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      • A antofik

        Thank you, kshegunov, for you replies.
        SetAsChild receives valid handle. QWindow in Qt was designed specifically to be the point of integration between different windows. I'm running the code in debug mode, so no optimizations are applied. The above code itself is executed without exceptions. The problem happens somewhere inside CefDoMessageLoopWork() later.

        kshegunovK Offline
        kshegunovK Offline
        kshegunov
        Moderators
        wrote on last edited by kshegunov
        #11

        @antofik said in Qt+Cef integration on Linux:

        The problem happens somewhere inside CefDoMessageLoopWork() later.

        Pull a trace out of that. And also bear in mind Qt very much dislikes sharing the (system) event loop with other things, so I'm still not convinced that integration is possible between these two libraries.

        Read and abide by the Qt Code of Conduct

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        • A Offline
          A Offline
          antofik
          wrote on last edited by
          #12

          Actually, I've managed to make it work.
          Just in case, if someone will need it in future:

            GtkWidget* gtkWin = gtk_window_new(GTK_WINDOW_TOPLEVEL);
            GtkWidget* parentView = gtk_vbox_new(FALSE, 0);
            GtkContainer* container = (GTK_CONTAINER(gtkWin));
            gtk_container_add(container, parentView);
            gtk_window_set_position(GTK_WINDOW(gtkWin), GTK_WIN_POS_CENTER);
            gtk_widget_show_all(GTK_WIDGET(gtkWin));
          
            GdkWindow* w = gtk_widget_get_window(parentView);
            XID t = gdk_x11_drawable_get_xid(w);
          
            WId wid = (WId) t;
            QWindow* win = QWindow::fromWinId(wid);
            setLayout(new QGridLayout());
            QWidget* widget = QWidget::createWindowContainer(win);
            this->layout()->addWidget(widget);
          
            info.SetAsChild(parentView);
          

          Basically, I've created my own GTK window, passed the reference on this window to CEF, and placed it into Qt widget using QWindow::fromWinId().

          T 1 Reply Last reply
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          • mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #13

            So would it be fair to conclude that it really
            wants a gtk windows handle and not what ever comes out of
            winId() ?

            A 1 Reply Last reply
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            • mrjjM mrjj

              So would it be fair to conclude that it really
              wants a gtk windows handle and not what ever comes out of
              winId() ?

              A Offline
              A Offline
              antofik
              wrote on last edited by
              #14

              Yes @mrjj, Cef is built on Gtk2, so it requires gtk handle, not the winId().

              Anyhow, it is possible to integrate Cef with Qt on linux, and that is what matters :-)

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              • G Offline
                G Offline
                gepgep
                wrote on last edited by
                #15

                is there somewhere a more complete example of mixing qt/gtk/cef?

                mrjjM 1 Reply Last reply
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                • G gepgep

                  is there somewhere a more complete example of mixing qt/gtk/cef?

                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #16

                  @gepgep
                  Not that i have stumbled upon.
                  Have you asked on the forum ?
                  http://magpcss.org/ceforum/

                  You cannot use http://doc.qt.io/qt-5/qtwebengine-index.html
                  or webkit ?

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                  • mrjjM mrjj

                    @gepgep
                    Not that i have stumbled upon.
                    Have you asked on the forum ?
                    http://magpcss.org/ceforum/

                    You cannot use http://doc.qt.io/qt-5/qtwebengine-index.html
                    or webkit ?

                    G Offline
                    G Offline
                    gepgep
                    wrote on last edited by
                    #17

                    @mrjj i am wondering if it can be done with cef due to (my) project restrictions ..
                    I have found several git repos with qt+cef, but only for windows. Also i managed to combine gtk with cef successfully, but i cant find anything about qt+cef@linux (maybe because qt+gtk is not a happy combination?). The code snippet from @antofik does not build (gtkwidget with qwidget is it even possible) or i am missing something?

                    mrjjM 1 Reply Last reply
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                    • G gepgep

                      @mrjj i am wondering if it can be done with cef due to (my) project restrictions ..
                      I have found several git repos with qt+cef, but only for windows. Also i managed to combine gtk with cef successfully, but i cant find anything about qt+cef@linux (maybe because qt+gtk is not a happy combination?). The code snippet from @antofik does not build (gtkwidget with qwidget is it even possible) or i am missing something?

                      mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by
                      #18

                      @gepgep
                      Well mixing Gtk and Qt is pretty rare use case as far as I know. Both being Widgets libraries.
                      And there is always the issue of the event loop.
                      So as far as integration it will not be funny.

                      @antofik sample wraps a gtk window using native Gtk calls +Qt and is apparently supported by
                      createWindowContainer so in this case it works.

                      I have not seen much info about this. sorry.

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                      • mrjjM mrjj

                        @gepgep
                        Well mixing Gtk and Qt is pretty rare use case as far as I know. Both being Widgets libraries.
                        And there is always the issue of the event loop.
                        So as far as integration it will not be funny.

                        @antofik sample wraps a gtk window using native Gtk calls +Qt and is apparently supported by
                        createWindowContainer so in this case it works.

                        I have not seen much info about this. sorry.

                        G Offline
                        G Offline
                        gepgep
                        wrote on last edited by
                        #19

                        @mrjj thanks for your time+replies

                        mrjjM 1 Reply Last reply
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                        • G gepgep

                          @mrjj thanks for your time+replies

                          mrjjM Offline
                          mrjjM Offline
                          mrjj
                          Lifetime Qt Champion
                          wrote on last edited by
                          #20

                          @gepgep
                          Hi
                          Just as a note.
                          Webkit been revived
                          https://forum.qt.io/topic/76739/webkit-status-2017

                          So you might be able to use that?

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                          • A antofik

                            Actually, I've managed to make it work.
                            Just in case, if someone will need it in future:

                              GtkWidget* gtkWin = gtk_window_new(GTK_WINDOW_TOPLEVEL);
                              GtkWidget* parentView = gtk_vbox_new(FALSE, 0);
                              GtkContainer* container = (GTK_CONTAINER(gtkWin));
                              gtk_container_add(container, parentView);
                              gtk_window_set_position(GTK_WINDOW(gtkWin), GTK_WIN_POS_CENTER);
                              gtk_widget_show_all(GTK_WIDGET(gtkWin));
                            
                              GdkWindow* w = gtk_widget_get_window(parentView);
                              XID t = gdk_x11_drawable_get_xid(w);
                            
                              WId wid = (WId) t;
                              QWindow* win = QWindow::fromWinId(wid);
                              setLayout(new QGridLayout());
                              QWidget* widget = QWidget::createWindowContainer(win);
                              this->layout()->addWidget(widget);
                            
                              info.SetAsChild(parentView);
                            

                            Basically, I've created my own GTK window, passed the reference on this window to CEF, and placed it into Qt widget using QWindow::fromWinId().

                            T Offline
                            T Offline
                            Tomato Page
                            wrote on last edited by
                            #21

                            @antofik
                            Dear antofix,
                            Could you send me a complete example. I'm try the method but still not working with qt 5.5

                            thanks

                            1 Reply Last reply
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