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hybrid webview

This commit is contained in:
Kyle Spearrin 2019-05-23 21:05:52 -04:00
parent bfa336b72d
commit 23f27282d6
5 changed files with 176 additions and 0 deletions
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2
src/Android/Android.csproj
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@ -43,6 +43,7 @@
</PropertyGroup>
<ItemGroup>
<Reference Include="Mono.Android" />
<Reference Include="Mono.Android.Export" />
<Reference Include="System" />
<Reference Include="System.Core" />
<Reference Include="System.Xml.Linq" />
@ -87,6 +88,7 @@
<Compile Include="Renderers\CustomEntryRenderer.cs" />
<Compile Include="Renderers\CustomSearchBarRenderer.cs" />
<Compile Include="Renderers\ExtendedListViewRenderer.cs" />
<Compile Include="Renderers\HybridWebViewRenderer.cs" />
<Compile Include="SplashActivity.cs" />
<Compile Include="Renderers\BoxedView\BoxedViewRecyclerAdapter.cs" />
<Compile Include="Renderers\BoxedView\BoxedViewRenderer.cs" />

88
src/Android/Renderers/HybridWebViewRenderer.cs Normal file
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@ -0,0 +1,88 @@
using System;
using Bit.App.Controls;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;
using Android.Webkit;
using AWebkit = Android.Webkit;
using Java.Interop;
using Android.Content;
using Bit.Droid.Renderers;
[assembly: ExportRenderer(typeof(HybridWebView), typeof(HybridWebViewRenderer))]
namespace Bit.Droid.Renderers
{
public class HybridWebViewRenderer : ViewRenderer<HybridWebView, AWebkit.WebView>
{
private const string JSFunction = "function invokeCSharpAction(data){jsBridge.invokeAction(data);}";
private readonly Context _context;
public HybridWebViewRenderer(Context context)
: base(context)
{
_context = context;
}
protected override void OnElementChanged(ElementChangedEventArgs<HybridWebView> e)
{
base.OnElementChanged(e);
if(Control == null)
{
var webView = new AWebkit.WebView(_context);
webView.Settings.JavaScriptEnabled = true;
webView.SetWebViewClient(new JSWebViewClient(string.Format("javascript: {0}", JSFunction)));
SetNativeControl(webView);
}
if(e.OldElement != null)
{
Control.RemoveJavascriptInterface("jsBridge");
var hybridWebView = e.OldElement as HybridWebView;
hybridWebView.Cleanup();
}
if(e.NewElement != null)
{
Control.AddJavascriptInterface(new JSBridge(this), "jsBridge");
Control.LoadUrl(Element.Uri);
}
}
public class JSBridge : Java.Lang.Object
{
private readonly WeakReference<HybridWebViewRenderer> _hybridWebViewRenderer;
public JSBridge(HybridWebViewRenderer hybridRenderer)
{
_hybridWebViewRenderer = new WeakReference<HybridWebViewRenderer>(hybridRenderer);
}
[JavascriptInterface]
[Export("invokeAction")]
public void InvokeAction(string data)
{
if(_hybridWebViewRenderer != null &&
_hybridWebViewRenderer.TryGetTarget(out HybridWebViewRenderer hybridRenderer))
{
hybridRenderer.Element.InvokeAction(data);
}
}
}
public class JSWebViewClient : WebViewClient
{
private readonly string _javascript;
public JSWebViewClient(string javascript)
{
_javascript = javascript;
}
public override void OnPageFinished(AWebkit.WebView view, string url)
{
base.OnPageFinished(view, url);
view.EvaluateJavascript(_javascript, null);
}
}
}
}

34
src/App/Controls/HybridWebView.cs Normal file
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@ -0,0 +1,34 @@
using System;
using Xamarin.Forms;
namespace Bit.App.Controls
{
public class HybridWebView : View
{
private Action<string> _func;
public static readonly BindableProperty UriProperty = BindableProperty.Create(propertyName: nameof(Uri),
returnType: typeof(string), declaringType: typeof(HybridWebView), defaultValue: default(string));
public string Uri
{
get { return (string)GetValue(UriProperty); }
set { SetValue(UriProperty, value); }
}
public void RegisterAction(Action<string> callback)
{
_func = callback;
}
public void Cleanup()
{
_func = null;
}
public void InvokeAction(string data)
{
_func?.Invoke(data);
}
}
}

51
src/iOS/Renderers/HybridWebViewRenderer.cs Normal file
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@ -0,0 +1,51 @@
using Foundation;
using WebKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
using Bit.App.Controls;
using Bit.iOS.Renderers;
[assembly: ExportRenderer(typeof(HybridWebView), typeof(HybridWebViewRenderer))]
namespace Bit.iOS.Renderers
{
public class HybridWebViewRenderer : ViewRenderer<HybridWebView, WKWebView>, IWKScriptMessageHandler
{
private const string JSFunction =
"function invokeCSharpAction(data){window.webkit.messageHandlers.invokeAction.postMessage(data);}";
private WKUserContentController _userController;
protected override void OnElementChanged(ElementChangedEventArgs<HybridWebView> e)
{
base.OnElementChanged(e);
if(Control == null)
{
_userController = new WKUserContentController();
var script = new WKUserScript(new NSString(JSFunction), WKUserScriptInjectionTime.AtDocumentEnd, false);
_userController.AddUserScript(script);
_userController.AddScriptMessageHandler(this, "invokeAction");
var config = new WKWebViewConfiguration { UserContentController = _userController };
var webView = new WKWebView(Frame, config);
SetNativeControl(webView);
}
if(e.OldElement != null)
{
_userController.RemoveAllUserScripts();
_userController.RemoveScriptMessageHandler("invokeAction");
var hybridWebView = e.OldElement as HybridWebView;
hybridWebView.Cleanup();
}
if(e.NewElement != null)
{
Control.LoadRequest(new NSUrlRequest(new NSUrl(Element.Uri)));
}
}
public void DidReceiveScriptMessage(WKUserContentController userContentController, WKScriptMessage message)
{
Element.InvokeAction(message.Body.ToString());
}
}
}

1
src/iOS/iOS.csproj
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@ -92,6 +92,7 @@
<ItemGroup>
<Compile Include="Main.cs" />
<Compile Include="AppDelegate.cs" />
<Compile Include="Renderers\HybridWebViewRenderer.cs" />
<Compile Include="Services\DeviceActionService.cs" />
<None Include="Entitlements.plist" />
<None Include="Info.plist" />