Ooui-tws-port/Ooui.Forms/Renderers/WebViewRenderer.cs

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2.9 KiB
C#
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using System;
using System.ComponentModel;
using Xamarin.Forms;
using Xamarin.Forms.Internals;
namespace Ooui.Forms.Renderers
{
public class WebViewRenderer : ViewRenderer<WebView, Div>, IWebViewDelegate
{
private bool _disposed;
private Iframe _iframe;
void IWebViewDelegate.LoadHtml(string html, string baseUrl)
{
try
{
if (string.IsNullOrEmpty(html))
{
if (Element.Source is HtmlWebViewSource urlWebViewSource)
{
html = urlWebViewSource.Html;
}
}
if (_iframe != null)
{
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_iframe.Source = html;
}
}
catch (Exception ex)
{
Log.Warning("WebView load string", $"WebView load string failed: {ex}");
}
}
void IWebViewDelegate.LoadUrl(string url)
{
try
{
if (string.IsNullOrEmpty(url))
{
if (Element.Source is UrlWebViewSource urlWebViewSource)
{
url = urlWebViewSource.Url;
}
}
if (_iframe != null)
{
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_iframe.Source = url;
}
}
catch (Exception ex)
{
Log.Warning("WebView load url", $"WebView load url failed: {ex}");
}
}
public override SizeRequest GetDesiredSize(double widthConstraint, double heightConstraint)
{
var size = new Size(100, 100);
return new SizeRequest(size, size);
}
protected override void OnElementChanged(ElementChangedEventArgs<WebView> e)
{
base.OnElementChanged(e);
if (e.NewElement != null)
{
if (Control == null)
{
var embed = new Div { ClassName = "embed-responsive" };
_iframe = new Iframe();
embed.AppendChild(_iframe);
SetNativeControl(embed);
}
}
Load();
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == WebView.SourceProperty.PropertyName)
Load();
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
if (disposing && !_disposed)
{
if (_iframe != null)
{
_iframe = null;
}
_disposed = true;
}
}
private void Load()
{
Element?.Source?.Load(this);
}
}
}