WPF Example - Improve demo of hosting popup in ChromiumWebBrowser instance

- LifespanHandler renamed to ExperimentalLifespanHandler to make it clear the feature is experimental
- Add additional check for devtools popup

Author: amaitland

CefSharp.Wpf.Example/CefSharp.Wpf.Example.csproj

@@ -116,7 +116,7 @@
     <Compile Include="Handlers\DisplayHandler.cs" />
     <Compile Include="Handlers\DragHandler.cs" />
     <Compile Include="Handlers\MenuHandler.cs" />
-    <Compile Include="Handlers\LifespanHandler.cs" />
+    <Compile Include="Handlers\ExperimentalLifespanHandler.cs" />
     <Compile Include="Handlers\RequestContextHandler.cs" />
     <Compile Include="Handlers\WpfBrowserProcessHandler.cs" />
     <Compile Include="Program.cs" />

CefSharp.Wpf.Example/Handlers/ExperimentalLifespanHandler.cs

@@ -0,0 +1,126 @@
+// Copyright © 2015 The CefSharp Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
+
+using System.Windows;
+using System.Windows.Interop;
+
+namespace CefSharp.Wpf.Example.Handlers
+{
+    /// <summary>
+    /// LifeSpanHandler implementation that demos hosting a popup in a new ChromiumWebBrowser instance.
+    /// This example code is EXPERIMENTAL
+    /// </summary>
+    public class ExperimentalLifespanHandler : ILifeSpanHandler
+    {
+        bool ILifeSpanHandler.OnBeforePopup(IWebBrowser browserControl, IBrowser browser, IFrame frame, string targetUrl, string targetFrameName, WindowOpenDisposition targetDisposition, bool userGesture, IPopupFeatures popupFeatures, IWindowInfo windowInfo, IBrowserSettings browserSettings, ref bool noJavascriptAccess, out IWebBrowser newBrowser)
+        {
+            //Set newBrowser to null unless your attempting to host the popup in a new instance of ChromiumWebBrowser
+            newBrowser = null;
+
+            var chromiumWebBrowser = (ChromiumWebBrowser)browserControl;
+
+            ChromiumWebBrowser chromiumBrowser = null;
+
+            var windowX = (windowInfo.X == int.MinValue) ? double.NaN : windowInfo.X;
+            var windowY = (windowInfo.Y == int.MinValue) ? double.NaN : windowInfo.Y;
+            var windowWidth = (windowInfo.Width == int.MinValue) ? double.NaN : windowInfo.Width;
+            var windowHeight = (windowInfo.Height == int.MinValue) ? double.NaN : windowInfo.Height;
+
+            chromiumWebBrowser.Dispatcher.Invoke(() =>
+            {
+                var owner = Window.GetWindow(chromiumWebBrowser);
+                chromiumBrowser = new ChromiumWebBrowser
+                {
+                    Address = targetUrl,
+                };
+
+                chromiumBrowser.SetAsPopup();
+                chromiumBrowser.LifeSpanHandler = this;
+
+                var popup = new Window
+                {
+                    Left = windowX,
+                    Top = windowY,
+                    Width = windowWidth,
+                    Height = windowHeight,
+                    Content = chromiumBrowser,
+                    Owner = owner,
+                    Title = targetFrameName
+                };
+
+                var windowInteropHelper = new WindowInteropHelper(popup);
+                //Create the handle Window handle (In WPF there's only one handle per window, not per control)
+                var handle = windowInteropHelper.EnsureHandle();
+
+                //The parentHandle value will be used to identify monitor info and to act as the parent window for dialogs,
+                //context menus, etc. If parentHandle is not provided then the main screen monitor will be used and some
+                //functionality that requires a parent window may not function correctly.
+                windowInfo.SetAsWindowless(handle);
+
+                popup.Closed += (o, e) =>
+                {
+                    var w = o as Window;
+                    if (w != null && w.Content is IWebBrowser)
+                    {
+                        (w.Content as IWebBrowser).Dispose();
+                        w.Content = null;
+                    }
+                };
+            });
+
+            newBrowser = chromiumBrowser;
+
+            return false;
+        }
+
+        void ILifeSpanHandler.OnAfterCreated(IWebBrowser browserControl, IBrowser browser)
+        {
+            if (!browser.IsDisposed && browser.IsPopup)
+            {
+                //DevTools is hosted in it's own popup, we don't perform any action here
+                if (!browser.MainFrame.Url.Equals("devtools://devtools/devtools_app.html"))
+                {
+                    var chromiumWebBrowser = (ChromiumWebBrowser)browserControl;
+
+                    chromiumWebBrowser.Dispatcher.Invoke(() =>
+                    {
+                        var owner = Window.GetWindow(chromiumWebBrowser);
+
+                        if (owner != null && owner.Content == browserControl)
+                        {
+                            owner.Show();
+                        }
+                    });
+                }
+            }
+        }
+
+        bool ILifeSpanHandler.DoClose(IWebBrowser browserControl, IBrowser browser)
+        {
+            return false;
+        }
+
+        void ILifeSpanHandler.OnBeforeClose(IWebBrowser browserControl, IBrowser browser)
+        {
+            if (!browser.IsDisposed && browser.IsPopup)
+            {
+                //DevTools is hosted in it's own popup, we don't perform any action here
+                if (!browser.MainFrame.Url.Equals("devtools://devtools/devtools_app.html"))
+                {
+                    var chromiumWebBrowser = (ChromiumWebBrowser)browserControl;
+
+                    chromiumWebBrowser.Dispatcher.Invoke(() =>
+                    {
+                        var owner = Window.GetWindow(chromiumWebBrowser);
+
+                        if (owner != null && owner.Content == browserControl)
+                        {
+                            owner.Close();
+                        }
+                    });
+                }
+            }
+        }
+    }
+}

CefSharp.Wpf.Example/Handlers/LifespanHandler.cs

@@ -90,7 +90,9 @@ public BrowserTabView()
             };
 
             browser.DisplayHandler = new DisplayHandler();
-            browser.LifeSpanHandler = new LifespanHandler();
+            //This LifeSpanHandler implementaion demos hosting a popup in a ChromiumWebBrowser
+            //instance, it's still considered Experimental
+            //browser.LifeSpanHandler = new ExperimentalLifespanHandler();
             browser.MenuHandler = new MenuHandler();
             browser.AccessibilityHandler = new AccessibilityHandler();
             var downloadHandler = new DownloadHandler();