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[webview_flutter] Add a backgroundColor option to the webview (#4584)
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‎packages/webview_flutter/webview_flutter/CHANGELOG.md‎

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@@ -1,3 +1,7 @@
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## 2.5.0
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* Adds an option to set the background color of the webview.
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## 2.4.0
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* Adds support for the `loadFile` and `loadHtmlString` methods.

‎packages/webview_flutter/webview_flutter/example/lib/main.dart‎

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@@ -48,6 +48,27 @@ const String kLocalExamplePage = '''
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</html>
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''';
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const String kTransparentBackgroundPage = '''
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<!DOCTYPE html>
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<html>
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<head>
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<title>Transparent background test</title>
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</head>
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<style type="text/css">
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body { background: transparent; margin: 0; padding: 0; }
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#container { position: relative; margin: 0; padding: 0; width: 100vw; height: 100vh; }
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#shape { background: red; width: 200px; height: 200px; margin: 0; padding: 0; position: absolute; top: calc(50% - 100px); left: calc(50% - 100px); }
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p { text-align: center; }
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</style>
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<body>
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<div id="container">
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<p>Transparent background test</p>
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<div id="shape"></div>
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</div>
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</body>
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</html>
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''';
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class WebViewExample extends StatefulWidget {
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@override
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_WebViewExampleState createState() => _WebViewExampleState();
@@ -68,6 +89,7 @@ class _WebViewExampleState extends State<WebViewExample> {
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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backgroundColor: Colors.green,
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appBar: AppBar(
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title: const Text('Flutter WebView example'),
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// This drop down menu demonstrates that Flutter widgets can be shown over the web view.
@@ -106,6 +128,7 @@ class _WebViewExampleState extends State<WebViewExample> {
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print('Page finished loading: $url');
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},
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gestureNavigationEnabled: true,
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backgroundColor: const Color(0x00000000),
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);
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}),
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floatingActionButton: favoriteButton(),
@@ -155,6 +178,7 @@ enum MenuOptions {
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navigationDelegate,
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loadLocalFile,
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loadHtmlString,
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transparentBackground,
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}
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class SampleMenu extends StatelessWidget {
@@ -170,6 +194,7 @@ class SampleMenu extends StatelessWidget {
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builder:
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(BuildContext context, AsyncSnapshot<WebViewController> controller) {
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return PopupMenuButton<MenuOptions>(
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key: const ValueKey<String>('ShowPopupMenu'),
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onSelected: (MenuOptions value) {
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switch (value) {
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case MenuOptions.showUserAgent:
@@ -199,6 +224,9 @@ class SampleMenu extends StatelessWidget {
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case MenuOptions.loadHtmlString:
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_onLoadHtmlStringExample(controller.data!, context);
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break;
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case MenuOptions.transparentBackground:
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_onTransparentBackground(controller.data!, context);
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break;
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}
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},
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itemBuilder: (BuildContext context) => <PopupMenuItem<MenuOptions>>[
@@ -239,6 +267,11 @@ class SampleMenu extends StatelessWidget {
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value: MenuOptions.loadLocalFile,
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child: Text('Load local file'),
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),
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const PopupMenuItem<MenuOptions>(
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key: ValueKey<String>('ShowTransparentBackgroundExample'),
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value: MenuOptions.transparentBackground,
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child: Text('Transparent background example'),
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),
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],
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);
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},
@@ -327,6 +360,11 @@ class SampleMenu extends StatelessWidget {
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await controller.loadHtmlString(kLocalExamplePage);
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}
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Future<void> _onTransparentBackground(
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WebViewController controller, BuildContext context) async {
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await controller.loadHtmlString(kTransparentBackgroundPage);
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}
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Widget _getCookieList(String cookies) {
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if (cookies == null || cookies == '""') {
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return Container();

‎packages/webview_flutter/webview_flutter/lib/src/webview.dart‎

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@@ -94,6 +94,7 @@ class WebView extends StatefulWidget {
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this.initialMediaPlaybackPolicy =
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AutoMediaPlaybackPolicy.require_user_action_for_all_media_types,
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this.allowsInlineMediaPlayback = false,
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this.backgroundColor,
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}) : assert(javascriptMode != null),
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assert(initialMediaPlaybackPolicy != null),
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assert(allowsInlineMediaPlayback != null),
@@ -286,6 +287,12 @@ class WebView extends StatefulWidget {
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/// The default policy is [AutoMediaPlaybackPolicy.require_user_action_for_all_media_types].
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final AutoMediaPlaybackPolicy initialMediaPlaybackPolicy;
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/// The background color of the [WebView].
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///
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/// When `null` the platform's webview default background color is used. By
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/// default [backgroundColor] is `null`.
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final Color? backgroundColor;
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@override
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State<StatefulWidget> createState() => _WebViewState();
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}
@@ -357,6 +364,7 @@ CreationParams _creationParamsfromWidget(WebView widget) {
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javascriptChannelNames: _extractChannelNames(widget.javascriptChannels),
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userAgent: widget.userAgent,
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autoMediaPlaybackPolicy: widget.initialMediaPlaybackPolicy,
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backgroundColor: widget.backgroundColor,
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);
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}
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‎packages/webview_flutter/webview_flutter/pubspec.yaml‎

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@@ -2,7 +2,7 @@ name: webview_flutter
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description: A Flutter plugin that provides a WebView widget on Android and iOS.
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repository: https://github.com/flutter/plugins/tree/master/packages/webview_flutter/webview_flutter
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issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+webview%22
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version: 2.4.0
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version: 2.5.0
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environment:
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sdk: ">=2.14.0 <3.0.0"
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dependencies:
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flutter:
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sdk: flutter
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webview_flutter_android: ^2.4.0
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webview_flutter_platform_interface: ^1.5.2
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webview_flutter_wkwebview: ^2.4.0
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webview_flutter_android: ^2.5.0
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webview_flutter_platform_interface: ^1.7.0
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webview_flutter_wkwebview: ^2.5.0
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dev_dependencies:
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build_runner: ^2.1.5

‎packages/webview_flutter/webview_flutter/test/webview_flutter_test.dart‎

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@@ -1020,6 +1020,34 @@ void main() {
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});
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});
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group('Background color', () {
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testWidgets('Defaults to null', (WidgetTester tester) async {
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await tester.pumpWidget(const WebView());
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final CreationParams params = captureBuildArgs(
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mockWebViewPlatform,
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creationParams: true,
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).single as CreationParams;
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expect(params.backgroundColor, null);
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});
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testWidgets('Can be transparent', (WidgetTester tester) async {
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const Color transparentColor = Color(0x00000000);
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await tester.pumpWidget(const WebView(
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backgroundColor: transparentColor,
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));
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final CreationParams params = captureBuildArgs(
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mockWebViewPlatform,
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creationParams: true,
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).single as CreationParams;
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expect(params.backgroundColor, transparentColor);
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});
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});
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group('Custom platform implementation', () {
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setUp(() {
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WebView.platform = MyWebViewPlatform();

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