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using System;
using System.ComponentModel;
using Android.Webkit;
using AWebView = Android.Webkit.WebView;
namespace Xamarin.Forms.Platform.Android
{
public class WebViewRenderer : ViewRenderer<WebView, AWebView>, IWebViewRenderer
{
bool _ignoreSourceChanges;
FormsWebChromeClient _webChromeClient;
public WebViewRenderer()
{
AutoPackage = false;
}
public void LoadHtml(string html, string baseUrl)
{
Control.LoadDataWithBaseURL(baseUrl == null ? "file:///android_asset/" : baseUrl, html, "text/html", "UTF-8", null);
}
public void LoadUrl(string url)
{
Control.LoadUrl(url);
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (Element != null)
{
if (Control != null)
Control.StopLoading();
Element.EvalRequested -= OnEvalRequested;
Element.GoBackRequested -= OnGoBackRequested;
Element.GoForwardRequested -= OnGoForwardRequested;
_webChromeClient?.Dispose();
}
}
base.Dispose(disposing);
}
protected virtual FormsWebChromeClient GetFormsWebChromeClient()
{
return new FormsWebChromeClient();
}
protected override Size MinimumSize()
{
return new Size(Context.ToPixels(40), Context.ToPixels(40));
}
protected override void OnElementChanged(ElementChangedEventArgs<WebView> e)
{
base.OnElementChanged(e);
if (Control == null)
{
var webView = new AWebView(Context);
webView.LayoutParameters = new global::Android.Widget.AbsoluteLayout.LayoutParams(LayoutParams.MatchParent, LayoutParams.MatchParent, 0, 0);
webView.SetWebViewClient(new WebClient(this));
_webChromeClient = GetFormsWebChromeClient();
_webChromeClient.SetContext(Context as IStartActivityForResult);
webView.SetWebChromeClient(_webChromeClient);
webView.Settings.JavaScriptEnabled = true;
webView.Settings.DomStorageEnabled = true;
SetNativeControl(webView);
}
if (e.OldElement != null)
{
e.OldElement.EvalRequested -= OnEvalRequested;
e.OldElement.GoBackRequested -= OnGoBackRequested;
e.OldElement.GoForwardRequested -= OnGoForwardRequested;
}
if (e.NewElement != null)
{
e.NewElement.EvalRequested += OnEvalRequested;
e.NewElement.GoBackRequested += OnGoBackRequested;
e.NewElement.GoForwardRequested += OnGoForwardRequested;
}
Load();
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
switch (e.PropertyName)
{
case "Source":
Load();
break;
}
}
void Load()
{
if (_ignoreSourceChanges)
return;
if (Element.Source != null)
Element.Source.Load(this);
UpdateCanGoBackForward();
}
void OnEvalRequested(object sender, EventArg<string> eventArg)
{
LoadUrl("javascript:" + eventArg.Data);
}
void OnGoBackRequested(object sender, EventArgs eventArgs)
{
if (Control.CanGoBack())
Control.GoBack();
UpdateCanGoBackForward();
}
void OnGoForwardRequested(object sender, EventArgs eventArgs)
{
if (Control.CanGoForward())
Control.GoForward();
UpdateCanGoBackForward();
}
void UpdateCanGoBackForward()
{
if (Element == null || Control == null)
return;
Element.CanGoBack = Control.CanGoBack();
Element.CanGoForward = Control.CanGoForward();
}
class WebClient : WebViewClient
{
WebNavigationResult _navigationResult = WebNavigationResult.Success;
WebViewRenderer _renderer;
public WebClient(WebViewRenderer renderer)
{
if (renderer == null)
throw new ArgumentNullException("renderer");
_renderer = renderer;
}
public override void OnPageFinished(AWebView view, string url)
{
if (_renderer.Element == null || url == "file:///android_asset/")
return;
var source = new UrlWebViewSource { Url = url };
_renderer._ignoreSourceChanges = true;
((IElementController)_renderer.Element).SetValueFromRenderer(WebView.SourceProperty, source);
_renderer._ignoreSourceChanges = false;
var args = new WebNavigatedEventArgs(WebNavigationEvent.NewPage, source, url, _navigationResult);
_renderer.Element.SendNavigated(args);
_renderer.UpdateCanGoBackForward();
base.OnPageFinished(view, url);
}
public override void OnReceivedError(AWebView view, ClientError errorCode, string description, string failingUrl)
{
_navigationResult = WebNavigationResult.Failure;
if (errorCode == ClientError.Timeout)
_navigationResult = WebNavigationResult.Timeout;
base.OnReceivedError(view, errorCode, description, failingUrl);
}
public override bool ShouldOverrideUrlLoading(AWebView view, string url)
{
if (_renderer.Element == null)
return true;
var args = new WebNavigatingEventArgs(WebNavigationEvent.NewPage, new UrlWebViewSource { Url = url }, url);
_renderer.Element.SendNavigating(args);
_navigationResult = WebNavigationResult.Success;
_renderer.UpdateCanGoBackForward();
return args.Cancel;
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
if (disposing)
_renderer = null;
}
}
}
}
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