public void SendAppearing()
{
if (_hasAppeared)
{
return;
}
_hasAppeared = true;
if (IsBusy)
{
if (IsPlatformEnabled)
{
MessagingCenter.Send(this, BusySetSignalName, true);
}
else
{
_pendingActions.Add(() => MessagingCenter.Send(this, BusySetSignalName, true));
}
}
OnAppearing();
Appearing?.Invoke(this, EventArgs.Empty);
var pageContainer = this as IPageContainer <Page>;
pageContainer?.CurrentPage?.SendAppearing();
FindApplication(this)?.OnPageAppearing(this);
}
private void AppearPropertyChanged(bool oldValue, bool newValue)
{
if (!oldValue && newValue && IsVisible)
{
MakeAppear(this);
Appearing?.Invoke();
}
else if (oldValue && !newValue && IsVisible)
{
MakeDisappear(this);
Disappearing?.Invoke();
}
}
public void SendAppearing()
{
// Only fire appearing if the page has been added to the windows
// Visual Hierarchy
// The window/application will take care of re-firing this appearing
// if it needs to
var window = this.FindParentOfType <Window>();
if (window?.Parent == null)
{
return;
}
if (_hasAppeared)
{
return;
}
_hasAppeared = true;
if (IsBusy)
{
if (IsPlatformEnabled)
{
MessagingCenter.Send(this, BusySetSignalName, true);
}
else
{
_pendingActions.Add(() => MessagingCenter.Send(this, BusySetSignalName, true));
}
}
OnAppearing();
Appearing?.Invoke(this, EventArgs.Empty);
var pageContainer = this as IPageContainer <Page>;
pageContainer?.CurrentPage?.SendAppearing();
FindApplication(this)?.OnPageAppearing(this);
}
public void SendAppearing()
{
if (_hasAppeared)
{
return;
}
_hasAppeared = true;
if (IsBusy)
{
MessagingCenter.Send(this, BusySetSignalName, true);
}
OnAppearing();
Appearing?.Invoke(this, EventArgs.Empty);
var pageContainer = this as IPageContainer <Page>;
pageContainer?.CurrentPage?.SendAppearing();
}
protected virtual void OnAppearing() => Appearing?.Invoke(this, EventArgs.Empty);
internal void InvokeAppearing()
{
Appearing?.Invoke(this, new PageAppearingEventArgs());
}
public override void RunPresentationAnimation()
{
base.RunPresentationAnimation();
Appearing?.Invoke();
}
public override void ViewDidAppear(bool animated)
{
base.ViewDidAppear(animated);
Appearing?.Invoke(this, EventArgs.Empty);
}