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using BookAStar.Views;
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using Android.Webkit;
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using Xamarin.Forms.Platform.Android;
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using BookAStar.Droid;
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using System;
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using Java.Interop;
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using System.ComponentModel;
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[assembly: Xamarin.Forms.ExportRenderer(typeof(MarkdownView), typeof(MarkdownViewRenderer))]
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namespace BookAStar.Droid
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{
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public class JSBridge : Java.Lang.Object
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{
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readonly WeakReference<MarkdownViewRenderer> hybridWebViewRenderer;
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public JSBridge(MarkdownViewRenderer hybridRenderer)
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{
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hybridWebViewRenderer = new WeakReference<MarkdownViewRenderer>(hybridRenderer);
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}
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[JavascriptInterface]
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[Export("invokeAction")]
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public void InvokeAction(string data)
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{
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MarkdownViewRenderer hybridRenderer;
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if (hybridWebViewRenderer != null && hybridWebViewRenderer.TryGetTarget(out hybridRenderer))
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{
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hybridRenderer.Element.Markdown=data;
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}
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}
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}
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public class MarkdownViewRenderer : ViewRenderer<MarkdownView, WebView>
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{
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private WebView editorView;
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private MarkdownEditor editorTemplate = new MarkdownEditor();
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private MarkdownDeep.Markdown markdown = new MarkdownDeep.Markdown();
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const string JavaScriptFunction = "function invokeCSharpAction(data){jsBridge.invokeAction(data);}";
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private void SetMDEditorText(string text)
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{
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editorTemplate.Model = (text == null) ? null : markdown.Transform(text);
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var html = editorTemplate.GenerateString();
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editorView.LoadDataWithBaseURL("file:///android_asset/",
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html, "text/html", "utf-8", null);
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}
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protected override void OnElementChanged(ElementChangedEventArgs<MarkdownView> e)
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{
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base.OnElementChanged(e);
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if (Control == null)
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{
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SetNativeControl(CreateNativeControl());
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}
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if (e.OldElement != null)
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{
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// Unsubscribe
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}
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if (e.NewElement != null)
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{
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// Subscribe
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var viewclient = new MarkdownWebViewClient(
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md => { e.NewElement.Markdown = md; });
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editorView.SetWebViewClient(viewclient);
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Control.AddJavascriptInterface(new JSBridge(this), "jsBridge");
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SetMDEditorText(e.NewElement.Markdown);
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InjectJS(JavaScriptFunction);
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}
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}
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void InjectJS(string script)
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{
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if (Control != null)
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{
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Control.LoadUrl(string.Format("javascript: {0}", script));
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}
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}
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private WebView CreateNativeControl()
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{
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editorView = new WebView(Context);
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editorView.Settings.BuiltInZoomControls = true;
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editorView.Settings.JavaScriptEnabled = true;
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editorView.Settings.LoadsImagesAutomatically = true;
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editorView.Settings.SetAppCacheEnabled(true);
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editorView.Settings.AllowContentAccess = true;
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editorView.Settings.AllowFileAccess = true;
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editorView.Settings.AllowFileAccessFromFileURLs = true;
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editorView.Settings.AllowUniversalAccessFromFileURLs = true;
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editorView.Settings.BlockNetworkImage = false;
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editorView.Settings.BlockNetworkLoads = false;
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editorView.Settings.DomStorageEnabled = true;
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// editorView.SetMinimumHeight(300);
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return editorView;
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}
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protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
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{
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if (e.PropertyName == "Markdown")
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{
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SetMDEditorText(((MarkdownView)Element).Markdown);
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}
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base.OnElementPropertyChanged(sender, e);
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}
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}
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}
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