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using System;
using System.ComponentModel;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
namespace Xamarin.Forms.Platform.WinPhone
{
public class WebViewRenderer : ViewRenderer<WebView, WebBrowser>, IWebViewRenderer
{
WebNavigationEvent _eventState;
bool _updating;
public async void LoadHtml(string html, string baseUrl)
{
string fileName = string.Format("formslocal_{0}.html", DateTime.Now.Ticks);
;
await SaveToIsoStore(fileName, html);
Control.Navigate(new Uri(fileName, UriKind.Relative));
}
public void LoadUrl(string url)
{
Control.Source = new Uri(url, UriKind.RelativeOrAbsolute);
}
protected override void OnElementChanged(ElementChangedEventArgs<WebView> e)
{
base.OnElementChanged(e);
if (Control == null)
{
var webBrowser = new WebBrowser();
webBrowser.IsScriptEnabled = true;
webBrowser.Navigated += WebBrowserOnNavigated;
webBrowser.Navigating += WebBrowserOnNavigating;
webBrowser.NavigationFailed += WebBrowserOnNavigationFailed;
SetNativeControl(webBrowser);
}
if (e.OldElement != null)
{
e.OldElement.EvalRequested -= OnEvalRequested;
e.OldElement.GoBackRequested -= OnGoBackRequested;
e.OldElement.GoForwardRequested -= OnGoForwardRequested;
Control.DataContext = null;
}
if (e.NewElement != null)
{
e.NewElement.EvalRequested += OnEvalRequested;
e.NewElement.GoBackRequested += OnGoBackRequested;
e.NewElement.GoForwardRequested += OnGoForwardRequested;
Control.DataContext = e.NewElement;
}
Load();
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
switch (e.PropertyName)
{
case "Source":
if (!_updating)
Load();
break;
}
}
void Load()
{
if (Element.Source != null)
Element.Source.Load(this);
UpdateCanGoBackForward();
}
void OnEvalRequested(object sender, EventArg<string> eventArg)
{
Control.Dispatcher.BeginInvoke(() => Control.InvokeScript("eval", eventArg.Data));
}
void OnGoBackRequested(object sender, EventArgs eventArgs)
{
if (Control.CanGoBack)
{
_eventState = WebNavigationEvent.Back;
Control.GoBack();
}
UpdateCanGoBackForward();
}
void OnGoForwardRequested(object sender, EventArgs eventArgs)
{
if (Control.CanGoForward)
{
_eventState = WebNavigationEvent.Forward;
Control.GoForward();
}
UpdateCanGoBackForward();
}
async Task SaveToIsoStore(string fileName, string html)
{
IIsolatedStorageFile store = Device.PlatformServices.GetUserStoreForApplication();
using(Stream file = await store.OpenFileAsync(fileName, FileMode.CreateNew, FileAccess.Write).ConfigureAwait(false))
{
byte[] bytes = Encoding.UTF8.GetBytes(html);
await file.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
}
}
void SendNavigated(UrlWebViewSource source, WebNavigationEvent evnt, WebNavigationResult result)
{
_updating = true;
((IElementController)Element).SetValueFromRenderer(WebView.SourceProperty, source);
_updating = false;
Element.SendNavigated(new WebNavigatedEventArgs(evnt, source, source.Url, result));
UpdateCanGoBackForward();
_eventState = WebNavigationEvent.NewPage;
}
// Nasty hack because we cant bind this because OneWayToSource isn't a thing in WP8, yay
void UpdateCanGoBackForward()
{
Element.CanGoBack = Control.CanGoBack;
Element.CanGoForward = Control.CanGoForward;
}
void WebBrowserOnNavigated(object sender, System.Windows.Navigation.NavigationEventArgs navigationEventArgs)
{
string url = navigationEventArgs.Uri.IsAbsoluteUri ? navigationEventArgs.Uri.AbsoluteUri : navigationEventArgs.Uri.OriginalString;
SendNavigated(new UrlWebViewSource { Url = url }, _eventState, WebNavigationResult.Success);
UpdateCanGoBackForward();
}
void WebBrowserOnNavigating(object sender, NavigatingEventArgs navigatingEventArgs)
{
string url = navigatingEventArgs.Uri.IsAbsoluteUri ? navigatingEventArgs.Uri.AbsoluteUri : navigatingEventArgs.Uri.OriginalString;
var args = new WebNavigatingEventArgs(_eventState, new UrlWebViewSource { Url = url }, url);
Element.SendNavigating(args);
navigatingEventArgs.Cancel = args.Cancel;
// reset in this case because this is the last event we will get
if (args.Cancel)
_eventState = WebNavigationEvent.NewPage;
}
void WebBrowserOnNavigationFailed(object sender, NavigationFailedEventArgs navigationFailedEventArgs)
{
string url = navigationFailedEventArgs.Uri.IsAbsoluteUri ? navigationFailedEventArgs.Uri.AbsoluteUri : navigationFailedEventArgs.Uri.OriginalString;
SendNavigated(new UrlWebViewSource { Url = url }, _eventState, WebNavigationResult.Failure);
}
}
}
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