protected override Task OnLoadStateAsync(LoadStateEventArgs e)
{
if (e.NavigationEventArgs.NavigationMode == NavigationMode.New || this.ViewModel == null)
{
WebViewModelBase vm = null;
if (e.Parameter is WebViewArguments args)
{
vm = PlatformBase.CurrentCore.CreateWebViewModel(args);
}
else if (e.Parameter is string webAddress)
{
vm = PlatformBase.CurrentCore.CreateWebViewModel(new WebViewArguments(webAddress));
}
else if (e.NavigationEventArgs.Parameter != null)
{
throw new System.ArgumentException($"Invalid argument of type {e.NavigationEventArgs.Parameter.GetType().FullName} was supplied to WebView.");
}
else
{
throw new System.ArgumentNullException("No argument was supplied to WebView.");
}
this.SetViewModel(vm);
}
return(base.OnLoadStateAsync(e));
}
/// <summary>
/// Configures a WebBrowserViewModel instance to get notified of WebView control events.
/// </summary>
/// <param name="vm"></param>
private void SetCurrentViewModel(WebViewModelBase vm)
{
if (this.ViewModel != null)
{
this.ViewModel.GoHomeRequested -= ViewModel_GoHomeRequested;
this.ViewModel.RefreshRequested -= ViewModel_RefreshRequested;
this.ViewModel.GoForwardRequested -= ViewModel_GoForwardRequested;
this.ViewModel.GoBackwardsRequested -= ViewModel_GoBackwardsRequested;
this.ViewModel.NavigateToRequested -= ViewModel_NavigateToRequested;
this.ViewModel.BrowserInstance = null;
webView.NavigationStarting -= webView_Navigating;
webView.NavigationCompleted -= webView_Navigated;
while (webView.CanGoBack)
{
webView.GoBack();
}
}
this.ViewModel = vm;
if (this.ViewModel != null)
{
webView.NavigationStarting += webView_Navigating;
webView.NavigationCompleted += webView_Navigated;
this.ViewModel.BrowserInstance = webView;
this.ViewModel.SetBrowserFunctions(() => webView.CanGoBack, () => webView.CanGoForward);
this.ViewModel.GoHomeRequested += ViewModel_GoHomeRequested;
this.ViewModel.RefreshRequested += ViewModel_RefreshRequested;
this.ViewModel.GoForwardRequested += ViewModel_GoForwardRequested;
this.ViewModel.GoBackwardsRequested += ViewModel_GoBackwardsRequested;
this.ViewModel.NavigateToRequested += ViewModel_NavigateToRequested;
this.ViewModel.InitialNavigation();
}
}
public JsonWebRequest(WebViewModelBase parent)
{
Cookies = parent.Cookies;
}
