private void OnBackButtonPressed(Page page, CancelEventArgs args)
{
if (CurrentContent != page)
return;
var eventArgs = new NavigatingCancelEventArgs(null, NavigationMode.Back, null);
RaiseNavigating(eventArgs);
args.Cancel = eventArgs.Cancel;
if (!args.Cancel && _rootPage.Navigation.NavigationStack.Count == 1 &&
_rootPage.Navigation.NavigationStack[0] == page)
RaiseNavigated(null, null, NavigationMode.Back);
}
private void OnBackButtonPressed(Page page, CancelEventArgs args)
{
if (CurrentContent != page)
return;
var isCancelable = CanGoBack || (_isRootFrame && XamarinFormsExtensions.SendBackButtonPressed != null);
if (isCancelable)
{
var eventArgs = new NavigatingCancelEventArgs(null, NavigationMode.Back, null, true, true);
RaiseNavigating(eventArgs);
args.Cancel = eventArgs.Cancel;
}
if (isCancelable && args.Cancel)
return;
if (!CanGoBack)
RaiseNavigated(null, null, NavigationMode.Back);
}
private bool RaiseNavigating(NavigatingCancelEventArgs args)
{
EventHandler<INavigationService, NavigatingCancelEventArgsBase> handler = Navigating;
if (handler == null)
return true;
handler(this, args);
return !args.Cancel;
}
private void OnBackButtonPressed(Page page, CancelEventArgs args)
{
if (CurrentContent != page)
return;
bool isCancelable = _rootPage.Navigation.NavigationStack.Count > 1 || XamarinFormsExtensions.SendBackButtonPressed != null;
var eventArgs = new NavigatingCancelEventArgs(null, NavigationMode.Back, null, isCancelable, true);
RaiseNavigating(eventArgs);
if (!isCancelable)
eventArgs.Cancel = false;
args.Cancel = eventArgs.Cancel;
if (!args.Cancel && _rootPage.Navigation.NavigationStack.Count == 1 &&
_rootPage.Navigation.NavigationStack[0] == page)
RaiseNavigated(null, null, NavigationMode.Back);
}
