public async Task <bool> GoBack()
{
var navigationEventHandlerArgs = new NavigationEventHandlerArgs(this.currentViewName, NavigationType.Backward, null);
OnNavigatingFrom(navigationEventHandlerArgs);
Task <NavigationResult>[] tasks = navigationEventHandlerArgs.Tasks.ToArray();
NavigationResult[] navigationResults = await Task.WhenAll(tasks);
if (navigationResults.Any(res => res == NavigationResult.Cancel))
{
return(false);
}
var poppedView = await NavigationPage.Navigation.PopAsync();
this.currentViewName = NavigationPage.CurrentPage.GetType().Name;
// If nothing is popped, we're at the main page, need to exit
if (poppedView == null)
{
if (!lifecycleService.TryCloseApplication())
{
}
}
else if (this.currentViewName != null)
{
this.OnNavigatingTo(new NavigationEventHandlerArgs(currentViewName, NavigationType.Backward, null));
}
return(true);
}
public async Task <bool> GoBack()
{
if (this.CanGoBack)
{
var navigationEventHandlerArgs = new NavigationEventHandlerArgs(this.currentView, NavigationType.Backward, null);
this.OnNavigatingFrom(navigationEventHandlerArgs);
Task <NavigationResult>[] tasks = navigationEventHandlerArgs.Tasks.ToArray();
NavigationResult[] navigationResults = await Task.WhenAll(tasks);
if (navigationResults.Any(res => res == NavigationResult.Cancel))
{
return(false);
}
this.frame.Navigated += this.FrameNavigatedBack;
this.frame.GoBack();
return(true);
}
else
{
if (!this.lifecycleService.TryCloseApplication())
{
}
}
return(false);
}
public async Task <bool> NavigateTo(string pageName, object parameter = null, bool removeBackEntry = false)
{
if (this.currentView != null)
{
var navigationEventHandlerArgs = new NavigationEventHandlerArgs(
this.currentView,
NavigationType.Forward,
parameter);
this.OnNavigatingFrom(navigationEventHandlerArgs);
Task <NavigationResult>[] tasks = navigationEventHandlerArgs.Tasks.ToArray();
NavigationResult[] navigationResults = await Task.WhenAll(tasks);
if (navigationResults.Any(res => res == NavigationResult.Cancel))
{
return(false);
}
}
var page = this.instanceFactory.GetInstanceByKey <Page>(pageName);
page.Title = pageName;
this.frame.Navigate(page, parameter);
if (removeBackEntry)
{
this.frame.Navigated += this.RemoveBackEntry;
}
this.currentView = pageName;
this.OnNavigatingTo(new NavigationEventHandlerArgs(this.currentView, NavigationType.Forward, parameter));
return(true);
}
public async Task <bool> NavigateTo(string viewName, object parameter = null, bool removeBackEntry = false)
{
if (this.isNavigating)
{
return(false);
}
else
{
this.isNavigating = true;
}
Page desiredPage = this.instanceFactory.GetInstanceByKey <Page>(viewName);
Page pageToRemove = null;
if (desiredPage != null)
{
if (!string.IsNullOrEmpty(this.currentViewName))
{
var navigationEventHandlerArgs = new NavigationEventHandlerArgs(this.currentViewName, NavigationType.Forward, parameter);
this.OnNavigatingFrom(navigationEventHandlerArgs);
Task <NavigationResult>[] tasks = navigationEventHandlerArgs.Tasks.ToArray();
NavigationResult[] navigationResults = await Task.WhenAll(tasks);
if (navigationResults.Any(res => res == NavigationResult.Cancel))
{
this.isNavigating = false;
return(false);
}
}
else
{
if (this.NavigationPage.Navigation.NavigationStack.Count == 1)
{
pageToRemove = this.NavigationPage.CurrentPage;
}
}
this.PrePush(desiredPage, false);
await this.NavigationPage.Navigation.PushAsync(desiredPage);
if (pageToRemove != null)
{
this.NavigationPage.Navigation.RemovePage(pageToRemove);
}
this.PostPush(desiredPage);
this.currentViewName = viewName;
this.OnNavigatingTo(new NavigationEventHandlerArgs(viewName, NavigationType.Forward, parameter));
this.isNavigating = false;
return(true);
}
this.isNavigating = false;
return(false);
}
protected virtual void OnNavigatedTo(NavigationEventHandlerArgs e)
{
NavigationEventHandler handler = this.NavigatingTo;
if (handler != null)
{
handler(this, e);
}
}
protected virtual void OnNavigatingFrom(NavigationEventHandlerArgs e)
{
NavigationEventHandler handler = NavigatingFrom;
if (handler != null)
{
handler(this, e);
}
}
public async Task <bool> GoBack()
{
if (this.CanGoBack)
{
var navigationEventHandlerArgs = new NavigationEventHandlerArgs(this.currentView,
NavigationType.Backward,
null);
this.OnNavigatingFrom(navigationEventHandlerArgs);
Task <NavigationResult>[] tasks = navigationEventHandlerArgs.Tasks.ToArray();
NavigationResult[] navigationResults = await Task.WhenAll(tasks);
if (navigationResults.Any(res => res == NavigationResult.Cancel))
{
return(false);
}
this.backStack.RemoveAt(this.backStack.Count - 1);
var viewName = this.backStack[this.backStack.Count - 1];
this.Bridge.SendMessage(
new BridgeMessage()
{
FunctionName = "navigateTo", Params = new object[] { viewName }
});
this.currentView = viewName;
if (this.currentView != null)
{
this.OnNavigatedTo(new NavigationEventHandlerArgs(this.currentView, NavigationType.Backward,
null));
}
else
{
if (!this.lifecycleService.TryCloseApplication())
{
}
}
return(true);
}
else
{
if (!this.lifecycleService.TryCloseApplication())
{
}
}
return(false);
}
public async Task <bool> GoBack()
{
if (this.CanGoBack)
{
var navigationEventHandlerArgs = new NavigationEventHandlerArgs(this.currentViewName, NavigationType.Backward, null);
this.OnNavigatingFrom(navigationEventHandlerArgs);
Task <NavigationResult>[] tasks = navigationEventHandlerArgs.Tasks.ToArray();
NavigationResult[] navigationResults = await Task.WhenAll(tasks);
if (navigationResults.Any(res => res == NavigationResult.Cancel))
{
return(false);
}
this.Frame.GoBack();
this.currentViewName = this.Frame.Content?.GetType().Name;
if (!string.IsNullOrEmpty(this.currentViewName))
{
this.OnNavigatingTo(new NavigationEventHandlerArgs(this.currentViewName, NavigationType.Backward, null));
}
else
{
if (!this.lifecycleService.TryCloseApplication())
{
}
}
return(true);
}
else
{
if (!this.lifecycleService.TryCloseApplication())
{
}
}
return(false);
}
private void NavigationServiceNavigatingFrom(object sender, NavigationEventHandlerArgs args)
{
if (args.PageView == this.pageName)
{
switch (args.NavigationType)
{
case NavigationType.Forward:
args.Tasks.Add(this.OnNavigatingForwardFromAsync());
break;
case NavigationType.Backward:
args.Tasks.Add(this.OnNavigatingBackwardFromAsync());
break;
default:
throw new ArgumentOutOfRangeException();
}
this.OnNavigatingFrom();
}
}
private void NavigationServiceNavigatingTo(object sender, NavigationEventHandlerArgs args)
{
if (args.PageView == this.pageName)
{
switch (args.NavigationType)
{
case NavigationType.Forward:
this.OnNavigatedForwardTo((TParam)args.Parameter);
break;
case NavigationType.Backward:
this.OnNavigatedBackwardTo((TParam)args.Parameter);
break;
default:
throw new ArgumentOutOfRangeException();
}
this.OnNavigatedTo((TParam)args.Parameter);
}
}
public async Task <bool> NavigateTo(string pageName, object parameter = null, bool removeBackEntry = false)
{
if (!string.IsNullOrEmpty(this.currentViewName))
{
var navigationEventHandlerArgs = new NavigationEventHandlerArgs(
this.currentViewName,
NavigationType.Forward,
parameter);
this.OnNavigatingFrom(navigationEventHandlerArgs);
Task <NavigationResult>[] tasks = navigationEventHandlerArgs.Tasks.ToArray();
NavigationResult[] navigationResults = await Task.WhenAll(tasks);
if (navigationResults.Any(res => res == NavigationResult.Cancel))
{
return(false);
}
}
var page = this.instanceFactory.GetInstanceByKey <Page>(pageName);
this.Frame.Navigate(page.GetType(), parameter);
if (removeBackEntry)
{
this.Frame.BackStack.RemoveAt(this.Frame.BackStackDepth - 1);
}
string desiredViewName = this.Frame.Content?.GetType().Name;
if (!string.IsNullOrEmpty(desiredViewName))
{
this.currentViewName = desiredViewName;
this.OnNavigatingTo(new NavigationEventHandlerArgs(desiredViewName, NavigationType.Forward, parameter));
}
return(true);
}
public async Task <bool> NavigateTo(string pageName, object parameter = null, bool removeBackEntry = false)
{
if (this.currentView != null)
{
var navigationEventHandlerArgs = new NavigationEventHandlerArgs(
this.currentView,
NavigationType.Forward,
parameter);
this.OnNavigatingFrom(navigationEventHandlerArgs);
Task <NavigationResult>[] tasks = navigationEventHandlerArgs.Tasks.ToArray();
NavigationResult[] navigationResults = await Task.WhenAll(tasks);
if (navigationResults.Any(res => res == NavigationResult.Cancel))
{
return(false);
}
}
this.Bridge.SendMessage(
new BridgeMessage()
{
FunctionName = "navigateTo", Params = new object[] { pageName }
});
if (!removeBackEntry)
{
this.backStack.Add(pageName);
}
this.currentView = pageName;
this.OnNavigatedTo(new NavigationEventHandlerArgs(pageName, NavigationType.Forward, parameter));
return(true);
}
protected virtual void OnNavigatingTo(NavigationEventHandlerArgs e)
{
NavigationEventHandler handler = this.NavigatingTo;
handler?.Invoke(this, e);
}
