From 842429a76e03bef75e6a47543f84aa6e513bbf74 Mon Sep 17 00:00:00 2001
From: Alex Maitland <amaitland@users.noreply.github.com>
Date: Sun, 16 May 2021 16:27:46 +1000
Subject: [PATCH] WPF Example - Implement DisplayHandler.OnFullscreenModeChange

- Use the new CefSharp.Handler.DisplayHandler base class
- Update xaml so ChromiumWebBrowser has direct reference to DataContext
- When fullscreen create new window and move the browser, move back when exit fullscreen
---
 .../Handlers/DisplayHandler.cs                | 102 ++++++++----------
 .../Views/BrowserTabView.xaml                 |   1 +
 2 files changed, 48 insertions(+), 55 deletions(-)

diff --git a/CefSharp.Wpf.Example/Handlers/DisplayHandler.cs b/CefSharp.Wpf.Example/Handlers/DisplayHandler.cs
index fae391a7fc..c1f4f7162b 100644
--- a/CefSharp.Wpf.Example/Handlers/DisplayHandler.cs
+++ b/CefSharp.Wpf.Example/Handlers/DisplayHandler.cs
@@ -2,66 +2,58 @@
 //
 // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
 
-using CefSharp.Structs;
+using CefSharp.Wpf.Example.Views;
 using System;
-using System.Collections.Generic;
-using CursorType = CefSharp.Enums.CursorType;
-using Size = CefSharp.Structs.Size;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Media;
 
 namespace CefSharp.Wpf.Example.Handlers
 {
-    public class DisplayHandler : IDisplayHandler
+    public class DisplayHandler : CefSharp.Handler.DisplayHandler
     {
-
-        void IDisplayHandler.OnAddressChanged(IWebBrowser chromiumWebBrowser, AddressChangedEventArgs addressChangedArgs)
-        {
-
-        }
-
-        bool IDisplayHandler.OnAutoResize(IWebBrowser chromiumWebBrowser, IBrowser browser, Size newSize)
-        {
-            return false;
-        }
-
-        bool IDisplayHandler.OnCursorChange(IWebBrowser chromiumWebBrowser, IBrowser browser, IntPtr cursor, CursorType type, CursorInfo customCursorInfo)
-        {
-            return false;
-        }
-
-        void IDisplayHandler.OnTitleChanged(IWebBrowser chromiumWebBrowser, TitleChangedEventArgs titleChangedArgs)
-        {
-
-        }
-
-        void IDisplayHandler.OnFaviconUrlChange(IWebBrowser chromiumWebBrowser, IBrowser browser, IList<string> urls)
-        {
-
-        }
-
-        void IDisplayHandler.OnFullscreenModeChange(IWebBrowser chromiumWebBrowser, IBrowser browser, bool fullscreen)
-        {
-
-        }
-
-        void IDisplayHandler.OnLoadingProgressChange(IWebBrowser chromiumWebBrowser, IBrowser browser, double progress)
-        {
-
-        }
-
-        bool IDisplayHandler.OnTooltipChanged(IWebBrowser chromiumWebBrowser, ref string text)
-        {
-            //text = "Sample text";
-            return false;
-        }
-
-        void IDisplayHandler.OnStatusMessage(IWebBrowser chromiumWebBrowser, StatusMessageEventArgs statusMessageArgs)
-        {
-
-        }
-
-        bool IDisplayHandler.OnConsoleMessage(IWebBrowser chromiumWebBrowser, ConsoleMessageEventArgs consoleMessageArgs)
-        {
-            return false;
+        private Grid parent;
+        private Window fullScreenWindow;
+
+        protected override void OnFullscreenModeChange(IWebBrowser chromiumWebBrowser, IBrowser browser, bool fullscreen)
+        {
+            var webBrowser = (ChromiumWebBrowser)chromiumWebBrowser;
+
+            webBrowser.Dispatcher.BeginInvoke((Action)(() =>
+            {
+                if (fullscreen)
+                {
+                    //In this example the parent is a Grid, if your parent is a different type
+                    //of control then update this code accordingly.
+                    parent = (Grid)VisualTreeHelper.GetParent(webBrowser);
+
+                    //NOTE: If the ChromiumWebBrowser instance doesn't have a direct reference to
+                    //the DataContext in this case the BrowserTabViewModel then your bindings won't
+                    //be updated/might cause issues like the browser reloads the Url when exiting
+                    //fullscreen.
+                    parent.Children.Remove(webBrowser);
+
+                    fullScreenWindow = new Window
+                    {
+                        WindowStyle = WindowStyle.None,
+                        WindowState = WindowState.Maximized,
+                        Content = webBrowser                        
+                    };
+
+                    fullScreenWindow.ShowDialog();
+                }
+                else
+                {
+                    fullScreenWindow.Content = null;
+
+                    parent.Children.Add(webBrowser);
+
+                    fullScreenWindow.Close();
+                    fullScreenWindow = null;
+                    parent = null;
+                }
+            }));
         }
     }
 }
diff --git a/CefSharp.Wpf.Example/Views/BrowserTabView.xaml b/CefSharp.Wpf.Example/Views/BrowserTabView.xaml
index bfc466b2d5..90c1329008 100644
--- a/CefSharp.Wpf.Example/Views/BrowserTabView.xaml
+++ b/CefSharp.Wpf.Example/Views/BrowserTabView.xaml
@@ -430,6 +430,7 @@
                                   Title="{Binding Title, Mode=OneWayToSource}"
                                   AllowDrop="True"
                                   WebBrowser="{Binding WebBrowser, Mode=OneWayToSource}"
+                                  DataContext="{Binding}"
                                   RenderOptions.BitmapScalingMode="{Binding ElementName=scalingModeComboBox, Path=SelectedItem}">
                     <!-- Just an example of how you may override the BrowserSettings. Disabled by default since it looks so
                          incredibly ugly... -->