protected override Task <bool> PushRoot(NavigationPushInfo pushInfo)
{
var newPage = GetInitializedPage(pushInfo);
var navigation = GetRootNavigation();
Device.BeginInvokeOnMainThread(async() => {
try {
if (navigation.NavigationStack.Any())
{
while (navigation.ModalStack.Count > 0)
{
var page = await navigation.PopModalAsync(true);
DisposeModalPage(page);
}
var hasBackButton = NavigationPage.GetHasBackButton(newPage);
NavigationPage.SetHasBackButton(newPage, false);
await navigation.PushAsync(newPage);
foreach (var page in navigation.NavigationStack.Where(p => p != newPage).ToList())
{
navigation.RemovePage(page);
}
NavigationPage.SetHasBackButton(newPage, hasBackButton);
}
pushInfo.OnCompletedTask?.TrySetResult(true);
}
catch (Exception e) {
Console.WriteLine(e);
pushInfo.OnCompletedTask?.TrySetResult(false);
}
});
return(pushInfo.OnCompletedTask?.Task);
}
void PushCallback(NavigationPushInfo pushInfo)
{
if (pushInfo == null)
{
throw new ArgumentNullException(nameof(pushInfo));
}
Push(pushInfo);
}
public virtual Page GetInitializedPage(NavigationPushInfo navigationPushInfo)
{
var page = GetPage(navigationPushInfo.To?.ToString());
var viewModel = GetViewModel(navigationPushInfo.To?.ToString());
viewModel.NavigationParams = navigationPushInfo.NavigationParams;
page.BindingContext = viewModel;
return(page);
}
protected override Task <bool> PushNormal(NavigationPushInfo pushInfo)
{
var newPage = GetInitializedPage(pushInfo);
var topNavigation = GetPickNavigation();
Device.BeginInvokeOnMainThread(async() => {
try {
await topNavigation.PushAsync(newPage);
pushInfo.OnCompletedTask?.TrySetResult(true);
}
catch (Exception e) {
Console.WriteLine(e);
pushInfo.OnCompletedTask?.TrySetResult(false);
}
});
return(pushInfo.OnCompletedTask?.Task);
}
public virtual Task Push(NavigationPushInfo pushInfo)
{
switch (pushInfo.Mode)
{
case NavigationMode.Normal:
return(PushNormal(pushInfo));
case NavigationMode.Modal:
return(PushModal(pushInfo));
case NavigationMode.Custom:
return(PushCustom(pushInfo));
case NavigationMode.Root:
return(PushRoot(pushInfo));
case NavigationMode.PopUp:
return(PushPopUp(pushInfo));
default:
throw new NotImplementedException();
}
}
protected override Task <bool> PushModal(NavigationPushInfo pushInfo)
{
var newPage = GetInitializedPage(pushInfo);
var topNavigation = GetRootNavigation();
Device.BeginInvokeOnMainThread(async() => {
try {
if (pushInfo.Argument is bool modalWithNavigation && modalWithNavigation)
{
await topNavigation.PushModalAsync(new NavigationPage(newPage));
}
else
{
await topNavigation.PushModalAsync(newPage);
}
pushInfo.OnCompletedTask?.TrySetResult(true);
}
catch (Exception e) {
Trace.WriteLine(e);
pushInfo.OnCompletedTask?.TrySetResult(false);
}
});
protected abstract Task <bool> PushModal(NavigationPushInfo pushInfo);
protected abstract Task <bool> PushRoot(NavigationPushInfo pushInfo);
protected abstract Task <bool> PushCustom(NavigationPushInfo pushInfo);
protected abstract Task <bool> PushPopUp(NavigationPushInfo pushInfo);
public abstract Page SetRoot(NavigationPushInfo pushInfo);
protected override Task <bool> PushCustom(NavigationPushInfo pushInfo)
{
pushInfo.OnCompletedTask?.TrySetResult(false);
return(pushInfo.OnCompletedTask?.Task);
}
public override Page SetRoot(NavigationPushInfo pushInfo)
{
RootPage = new NavigationPage(GetInitializedPage(pushInfo));
return(RootPage);
}