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Free webview2 control resources when page is unloaded.
1 parent 0b7d035 commit df19cef

16 files changed

+94
-32
lines changed

‎SampleApps/webview2_sample_uwp/Package.appxmanifest

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@@ -50,7 +50,6 @@
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<Capability Name="privateNetworkClientServer" />
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<uap:Capability Name="enterpriseAuthentication"/>
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<uap:Capability Name="sharedUserCertificates"/>
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<rescap:Capability Name="enterpriseCloudSSO" />
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<DeviceCapability Name="location"/>
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<DeviceCapability Name="microphone"/>
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<DeviceCapability Name="webcam"/>

‎SampleApps/webview2_sample_uwp/Pages/AddHostObject.xaml

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@@ -2,14 +2,14 @@
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Use of this source code is governed by a BSD-style license that can be
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found in the LICENSE file.-->
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<Page
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<local:BasePage
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x:Class="WebView2_UWP.Pages.AddHostObject"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:local="using:WebView2_UWP.Pages"
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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xmlns:controls="using:Microsoft.UI.Xaml.Controls"
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xmlns:local="using:WebView2_UWP.Pages"
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mc:Ignorable="d"
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Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
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@@ -77,5 +77,5 @@ found in the LICENSE file.-->
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<controls:WebView2 Grid.Column="1" x:Name="WebView2" />
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</Grid>
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</Page>
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</local:BasePage>
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‎SampleApps/webview2_sample_uwp/Pages/AddHostObject.xaml.cs

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namespace WebView2_UWP.Pages
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{
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public sealed partial class AddHostObject : Page
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public sealed partial class AddHostObject : BasePage
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{
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private Bridge _bridge;
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‎SampleApps/webview2_sample_uwp/Pages/BasePage.cs

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@@ -0,0 +1,43 @@
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// Copyright (C) Microsoft Corporation. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
4+
5+
using Microsoft.UI.Xaml.Controls;
6+
using System.Diagnostics;
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using Windows.UI.Xaml;
8+
using Windows.UI.Xaml.Controls;
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using Windows.UI.Xaml.Media;
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namespace WebView2_UWP.Pages
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{
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public class BasePage : Page
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{
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public BasePage()
16+
{
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Unloaded += BasePage_Unloaded;
18+
}
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20+
private void BasePage_Unloaded(object sender, RoutedEventArgs e)
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{
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// The garbage collector can be slow to dispose of the
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// webviews. Manually free the resources being used by
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// the webviews since they are no longer needed after
25+
// the page has been unloaded.
26+
CloseAllWebViews(this);
27+
}
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29+
private void CloseAllWebViews(DependencyObject root)
30+
{
31+
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(root); i++)
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{
33+
var childVisual = VisualTreeHelper.GetChild(root, i);
34+
CloseAllWebViews(childVisual);
35+
36+
if (childVisual is WebView2 webView)
37+
{
38+
webView.Close();
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}
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}
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}
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}
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}

‎SampleApps/webview2_sample_uwp/Pages/Browser.xaml

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@@ -2,13 +2,14 @@
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Use of this source code is governed by a BSD-style license that can be
33
found in the LICENSE file.-->
44

5-
<Page
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<local:BasePage
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x:Class="WebView2_UWP.Pages.Browser"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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xmlns:controls="using:Microsoft.UI.Xaml.Controls"
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xmlns:local="using:WebView2_UWP.Pages"
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mc:Ignorable="d"
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Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
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@@ -45,4 +46,4 @@ found in the LICENSE file.-->
4546
<Rectangle Grid.Row="2" Fill="LightGray"/>
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<TextBlock x:Name="StatusBar" Text="WebView2" VerticalAlignment="Center" Grid.Row="2" Margin="10,0,10,0"/>
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</Grid>
48-
</Page>
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</local:BasePage>

‎SampleApps/webview2_sample_uwp/Pages/Browser.xaml.cs

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namespace WebView2_UWP.Pages
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{
22-
public sealed partial class Browser : Page
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public sealed partial class Browser : BasePage
2323
{
2424
private string _homeUrl = "https://developer.microsoft.com/en-us/microsoft-edge/webview2/";
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2626
public Browser()
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{
28-
this.InitializeComponent();
28+
InitializeComponent();
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AddressBar.Text = _homeUrl;
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3131
WebView2.CoreWebView2Initialized += WebView2_CoreWebView2Initialized;
@@ -36,7 +36,11 @@ public Browser()
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WebView2.Source = new Uri(AddressBar.Text);
3737
}
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39+
#if USE_WEBVIEW2_SMOKETEST
3940
private async void WebView2_CoreWebView2Initialized(WebView2 sender, CoreWebView2InitializedEventArgs args)
41+
#else
42+
private void WebView2_CoreWebView2Initialized(WebView2 sender, CoreWebView2InitializedEventArgs args)
43+
#endif
4044
{
4145
if (args.Exception != null)
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{
@@ -59,7 +63,7 @@ private async void WebView2_CoreWebView2Initialized(WebView2 sender, CoreWebView
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}
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// <DownloadStarting>
62-
private async void CoreWebView2_DownloadStarting(CoreWebView2 sender, CoreWebView2DownloadStartingEventArgs args)
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private void CoreWebView2_DownloadStarting(CoreWebView2 sender, CoreWebView2DownloadStartingEventArgs args)
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{
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// Developer can obtain a deferral for the event so that the CoreWebView2
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// doesn't examine the properties we set on the event args until
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142146
Debug.WriteLine(message);
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}
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145-
private async void WebView2_NavigationStarting(WebView2 sender, CoreWebView2NavigationStartingEventArgs args)
149+
private void WebView2_NavigationStarting(WebView2 sender, CoreWebView2NavigationStartingEventArgs args)
146150
{
147151
RefreshButton.IsEnabled = false;
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CancelButton.IsEnabled = true;
149153
}
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155+
#if USE_WEBVIEW2_SMOKETEST
151156
private async void WebView2_NavigationCompleted(WebView2 sender, CoreWebView2NavigationCompletedEventArgs args)
157+
#else
158+
private void WebView2_NavigationCompleted(WebView2 sender, CoreWebView2NavigationCompletedEventArgs args)
159+
#endif
152160
{
153161
StatusUpdate("Navigation complete");
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‎SampleApps/webview2_sample_uwp/Pages/ExecuteJavascript.xaml

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@@ -2,14 +2,14 @@
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Use of this source code is governed by a BSD-style license that can be
33
found in the LICENSE file.-->
44

5-
<Page
5+
<local:BasePage
66
x:Class="WebView2_UWP.Pages.ExecuteJavascript"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
9-
xmlns:local="using:WebView2_UWP"
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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xmlns:controls="using:Microsoft.UI.Xaml.Controls"
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xmlns:local="using:WebView2_UWP.Pages"
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mc:Ignorable="d"
1414
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
1515

@@ -83,5 +83,5 @@ found in the LICENSE file.-->
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8484
<controls:WebView2 Grid.Column="1" x:Name="WebView2" />
8585
</Grid>
86-
</Page>
86+
</local:BasePage>
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‎SampleApps/webview2_sample_uwp/Pages/ExecuteJavascript.xaml.cs

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@@ -10,7 +10,7 @@
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namespace WebView2_UWP.Pages
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{
13-
public sealed partial class ExecuteJavascript : Page
13+
public sealed partial class ExecuteJavascript : BasePage
1414
{
1515
Dictionary<string, string> codeSnippets = new Dictionary<string, string>()
1616
{
@@ -29,7 +29,7 @@ public ExecuteJavascript()
2929
WebView2.Source = new Uri("http://appassets.html.example/execute_javascript.html");
3030
}
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32-
private async void WebView2_CoreWebView2Initialized(WebView2 sender, CoreWebView2InitializedEventArgs args)
32+
private void WebView2_CoreWebView2Initialized(WebView2 sender, CoreWebView2InitializedEventArgs args)
3333
{
3434
sender.CoreWebView2.SetVirtualHostNameToFolderMapping("appassets.html.example", "html", CoreWebView2HostResourceAccessKind.Allow);
3535
}

‎SampleApps/webview2_sample_uwp/Pages/NewWindow.xaml

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@@ -2,14 +2,14 @@
22
Use of this source code is governed by a BSD-style license that can be
33
found in the LICENSE file.-->
44

5-
<Page
5+
<local:BasePage
66
x:Class="WebView2_UWP.Pages.NewWindow"
77
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
88
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:local="using:WebView2_UWP.Pages"
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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xmlns:controls="using:Microsoft.UI.Xaml.Controls"
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xmlns:local="using:WebView2_UWP.Pages"
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mc:Ignorable="d"
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Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
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@@ -78,4 +78,4 @@ found in the LICENSE file.-->
7878
</Grid>
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</Grid>
81-
</Page>
81+
</local:BasePage>

‎SampleApps/webview2_sample_uwp/Pages/NewWindow.xaml.cs

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@@ -10,7 +10,7 @@
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1111
namespace WebView2_UWP.Pages
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{
13-
public sealed partial class NewWindow : Page
13+
public sealed partial class NewWindow : BasePage
1414
{
1515
public enum OptionEnum
1616
{
@@ -65,7 +65,7 @@ public NewWindow()
6565
WebView2.Source = new Uri("http://appassets.html.example/new_window.html");
6666
}
6767

68-
private async void WebView2_CoreWebView2Initialized(WebView2 sender, CoreWebView2InitializedEventArgs args)
68+
private void WebView2_CoreWebView2Initialized(WebView2 sender, CoreWebView2InitializedEventArgs args)
6969
{
7070
sender.CoreWebView2.SetVirtualHostNameToFolderMapping("appassets.html.example", "html", CoreWebView2HostResourceAccessKind.Allow);
7171
sender.CoreWebView2.NewWindowRequested += CoreWebView2_NewWindowRequested;

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