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using System;
using Xamarin.Forms.Platform;
namespace Xamarin.Forms
{
[RenderWith(typeof(_WebViewRenderer))]
public class WebView : View
{
public static readonly BindableProperty SourceProperty = BindableProperty.Create("Source", typeof(WebViewSource), typeof(WebView), default(WebViewSource),
propertyChanging: (bindable, oldvalue, newvalue) =>
{
var source = oldvalue as WebViewSource;
if (source != null)
source.SourceChanged -= ((WebView)bindable).OnSourceChanged;
}, propertyChanged: (bindable, oldvalue, newvalue) =>
{
var source = newvalue as WebViewSource;
var webview = (WebView)bindable;
if (source != null)
{
source.SourceChanged += webview.OnSourceChanged;
SetInheritedBindingContext(source, webview.BindingContext);
}
});
static readonly BindablePropertyKey CanGoBackPropertyKey = BindableProperty.CreateReadOnly("CanGoBack", typeof(bool), typeof(WebView), false);
public static readonly BindableProperty CanGoBackProperty = CanGoBackPropertyKey.BindableProperty;
static readonly BindablePropertyKey CanGoForwardPropertyKey = BindableProperty.CreateReadOnly("CanGoForward", typeof(bool), typeof(WebView), false);
public static readonly BindableProperty CanGoForwardProperty = CanGoForwardPropertyKey.BindableProperty;
public bool CanGoBack
{
get { return (bool)GetValue(CanGoBackProperty); }
internal set { SetValue(CanGoBackPropertyKey, value); }
}
public bool CanGoForward
{
get { return (bool)GetValue(CanGoForwardProperty); }
internal set { SetValue(CanGoForwardPropertyKey, value); }
}
[TypeConverter(typeof(WebViewSourceTypeConverter))]
public WebViewSource Source
{
get { return (WebViewSource)GetValue(SourceProperty); }
set { SetValue(SourceProperty, value); }
}
public void Eval(string script)
{
EventHandler<EventArg<string>> handler = EvalRequested;
if (handler != null)
handler(this, new EventArg<string>(script));
}
public void GoBack()
{
EventHandler handler = GoBackRequested;
if (handler != null)
handler(this, EventArgs.Empty);
}
public void GoForward()
{
EventHandler handler = GoForwardRequested;
if (handler != null)
handler(this, EventArgs.Empty);
}
public event EventHandler<WebNavigatedEventArgs> Navigated;
public event EventHandler<WebNavigatingEventArgs> Navigating;
protected override void OnBindingContextChanged()
{
base.OnBindingContextChanged();
WebViewSource source = Source;
if (source != null)
{
SetInheritedBindingContext(source, BindingContext);
}
}
protected override void OnPropertyChanged(string propertyName)
{
if (propertyName == "BindingContext")
{
WebViewSource source = Source;
if (source != null)
SetInheritedBindingContext(source, BindingContext);
}
base.OnPropertyChanged(propertyName);
}
protected void OnSourceChanged(object sender, EventArgs e)
{
OnPropertyChanged(SourceProperty.PropertyName);
}
internal event EventHandler<EventArg<string>> EvalRequested;
internal event EventHandler GoBackRequested;
internal event EventHandler GoForwardRequested;
internal void SendNavigated(WebNavigatedEventArgs args)
{
EventHandler<WebNavigatedEventArgs> handler = Navigated;
if (handler != null)
handler(this, args);
}
internal void SendNavigating(WebNavigatingEventArgs args)
{
EventHandler<WebNavigatingEventArgs> handler = Navigating;
if (handler != null)
handler(this, args);
}
}
}
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