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