Implement wxEVT_WEBVIEW_FULLSCREEN_CHANGED in GTK

interface/wx/webview.h

@@ -431,7 +431,7 @@ public:
     @event{EVT_WEBVIEW_FULL_SCREEN_CHANGED(id, func)}
        Process a @c EVT_WEBVIEW_FULL_SCREEN_CHANGED event, generated when
        the page wants to enter or leave fullscreen. Use GetInt to get the status.
-       Currently only implemented for the edge backend.
+       Currently only implemented for the edge and WebKit2GTK+ backend.
     @endEventTable
 
     @since 2.9.3

src/gtk/webview_webkit2.cpp

@@ -253,6 +253,34 @@ wxgtk_webview_webkit_new_window(WebKitPolicyDecision *decision,
     return TRUE;
 }
 
+static gboolean
+wxgtk_webview_webkit_enter_fullscreen(WebKitWebView *WXUNUSED(web_view),
+                                      wxWebViewWebKit *webKitCtrl)
+{
+    wxWebViewEvent event(wxEVT_WEBVIEW_FULLSCREEN_CHANGED,
+                                       webKitCtrl->GetId(),
+                                       wxString(),
+                                       wxString());
+    event.SetInt(1);
+    webKitCtrl->HandleWindowEvent(event);
+
+    return FALSE;
+}
+
+static gboolean
+wxgtk_webview_webkit_leave_fullscreen(WebKitWebView *WXUNUSED(web_view),
+                                      wxWebViewWebKit *webKitCtrl)
+{
+    wxWebViewEvent event(wxEVT_WEBVIEW_FULLSCREEN_CHANGED,
+                                       webKitCtrl->GetId(),
+                                       wxString(),
+                                       wxString());
+    event.SetInt(0);
+    webKitCtrl->HandleWindowEvent(event);
+
+    return FALSE;
+}
+
 static gboolean
 wxgtk_webview_webkit_decide_policy(WebKitWebView *web_view,
                                    WebKitPolicyDecision *decision,
@@ -583,6 +611,12 @@ bool wxWebViewWebKit::Create(wxWindow *parent,
     g_signal_connect(m_web_view, "create",
                      G_CALLBACK(wxgtk_webview_webkit_create_webview), this);
 
+    g_signal_connect(m_web_view, "enter-fullscreen",
+                     G_CALLBACK(wxgtk_webview_webkit_enter_fullscreen), this);
+
+    g_signal_connect(m_web_view, "leave-fullscreen",
+                     G_CALLBACK(wxgtk_webview_webkit_leave_fullscreen), this);
+
     WebKitFindController* findctrl = webkit_web_view_get_find_controller(m_web_view);
     g_signal_connect(findctrl, "counted-matches",
                      G_CALLBACK(wxgtk_webview_webkit_counted_matches),