private void View_Disappearing(object sender, EventArgs e)
{
Page view = sender as Page;
if (view == null)
{
return;
}
var lifeCycleModel = view.BindingContext as IAtomViewLifeCycleModel;
lifeCycleModel?.OnDisappearing();
Device.BeginInvokeOnMainThread(async() => {
try
{
await Task.Delay(1000);
bool exists = !nav.NavigationStack.Contains(view) && !nav.ModalStack.Contains(view);
if (exists)
{
lifeCycleModel?.OnRemoved();
// also remove...
view.Appearing -= View_Appearing;
view.Disappearing -= View_Disappearing;
AtomCoachMarks.SetCoachMark(view, null);
}
}
catch (Exception ex) {
UIAtomsApplication.Instance.LogException?.Invoke(ex);
}
});
}
public async Task <Page> NewPage(Type type, object parameters)
{
Type pageType = type;
Type viewModelType = null;
if (!IsPage(type))
{
pageType = await GetRelatedType(type, type.Name.Substring(0, type.Name.Length - "ViewModel".Length));
viewModelType = type;
}
object v = Activator.CreateInstance(pageType);
Page view = v as Page;
if (viewModelType == null)
{
viewModelType = await GetRelatedType(type, pageType.Name + "ViewModel");
}
if (viewModelType != null)
{
object model = NewModel(viewModelType);
if (parameters != null)
{
foreach (var p in parameters.GetType().GetProperties())
{
if (!p.CanRead)
{
continue;
}
object value = p.GetValue(parameters);
if (value == null)
{
continue;
}
var pm = viewModelType.GetProperty(p.Name);
if (pm == null)
{
continue;
}
if (pm.PropertyType != value.GetType())
{
Type n = Nullable.GetUnderlyingType(pm.PropertyType);
if (n == null || n != value.GetType())
{
value = Convert.ChangeType(value, pm.PropertyType);
}
}
pm.SetValue(model, value);
}
}
view.BindingContext = model;
// check if viewmodel has IsBusy property...
/*var atomViewModel = model as IAtomViewModel;
* if (atomViewModel != null) {
* view.SetBinding(Page.IsBusyProperty, new Binding("IsBusy"));
* }*/
var lifeCycleModel = model as IAtomViewLifeCycleModel;
if (lifeCycleModel != null)
{
view.Appearing += View_Appearing;
view.Disappearing += View_Disappearing;
//view.Appearing += (s, e) =>
//{
// lifeCycleModel.OnAppearing();
//};
//view.Disappearing += async (s, e) =>
//{
// lifeCycleModel.OnDisappearing();
// await Task.Delay(100);
// bool exists = !nav.NavigationStack.Contains(view) && !nav.ModalStack.Contains(view);
// if (exists)
// {
// lifeCycleModel.OnRemoved();
// }
//};
}
}
// find coachmark....
var ct = await GetRelatedType(pageType, "CoachMarks");
if (ct != null)
{
AtomCoachMarks.SetCoachMark(view, ct);
}
return(view);
}
