public static UIView DataTemplateToNativeView(this Xamarin.Forms.DataTemplate dt, object bindingContext, Xamarin.Forms.View rootView)
{
if (dt == null)
{
return(null);
}
object content = (dt is DataTemplateSelector dts)
? dts.SelectTemplate(bindingContext, rootView)
: dt.CreateContent();
View view;
switch (content)
{
case ViewCell viewCell:
viewCell.Parent = rootView;
viewCell.BindingContext = bindingContext;
view = viewCell.View;
break;
case View view1:
view1.Parent = rootView;
view1.BindingContext = bindingContext;
view = view1;
break;
default:
return(null);
}
return(new FormsViewContainer
{
View = view
});
}
void OnHeaderOrFooterChanged(ref Element storage, string property, object dataObject, DataTemplate template, bool templateChanged)
{
if (dataObject == null)
{
if (!templateChanged)
{
OnPropertyChanging(property);
storage = null;
OnPropertyChanged(property);
}
return;
}
if (template == null)
{
var view = dataObject as Element;
if (view == null || view is Page)
{
view = new Label {
Text = dataObject.ToString()
}
}
;
view.Parent = this;
OnPropertyChanging(property);
storage = view;
OnPropertyChanged(property);
}
else if (storage == null || templateChanged)
{
OnPropertyChanging(property);
storage = template.CreateContent() as Element;
if (storage != null)
{
storage.BindingContext = dataObject;
storage.Parent = this;
}
OnPropertyChanged(property);
}
else
{
storage.BindingContext = dataObject;
}
}
public static void OnViewTemplateChanged(
DataTemplate newViewTemplate,
ref View localViewRef,
object currentViewData,
Action <Element> OnChildRemoved,
Action <Element> OnChildAdded,
Shell shell)
{
View newContentView = currentViewData as View;
if (newViewTemplate != null)
{
newContentView = (View)newViewTemplate.CreateContent(newViewTemplate, shell);
}
SetView(ref localViewRef,
newContentView,
OnChildRemoved,
OnChildAdded);
}
public void RecycleCell(object data, DataTemplate dataTemplate, VisualElement parent)
{
if (_viewCell == null) {
_viewCell = (dataTemplate.CreateContent () as FastGridCell);
_viewCell.BindingContext = data;
_viewCell.Parent = parent;
_viewCell.PrepareCell (new Size (Bounds.Width, Bounds.Height));
_originalBindingContext = _viewCell.BindingContext;
var renderer = RendererFactory.GetRenderer (_viewCell.View);
_view = renderer.NativeView;
_view.AutoresizingMask = UIViewAutoresizing.All;
_view.ContentMode = UIViewContentMode.ScaleToFill;
ContentView.AddSubview (_view);
return;
} else if (data == _originalBindingContext) {
_viewCell.BindingContext = _originalBindingContext;
} else {
_viewCell.BindingContext = data;
}
}
private void SetupContentGrid()
{
_contentGrid = new Grid {
VerticalOptions = LayoutOptions.FillAndExpand,
HorizontalOptions = LayoutOptions.FillAndExpand,
RowDefinitions = {
new RowDefinition { Height = Device.OnPlatform(32,10,0) },
new RowDefinition { Height = 50 },
new RowDefinition { Height = Device.OnPlatform(200,220,0) },
new RowDefinition { Height = 50 },
new RowDefinition { Height = new GridLength(1, GridUnitType.Star) },
new RowDefinition { Height = 40 },
},
IsVisible = false
};
_contentGrid.Children.Add(new StackLayout { Padding = new Thickness(20, 0, 0, 0), Children = { new Label { Text = "Upcoming Events", TextColor = Color.White, FontSize = 24, VerticalOptions = LayoutOptions.CenterAndExpand } } }, 0, 1);
_contentGrid.Children.Add(new StackLayout { Padding = new Thickness(20, 0, 0, 0), Children = { new Label { Text = "Recent Messages", TextColor = Color.White, FontSize = 24, VerticalOptions = LayoutOptions.CenterAndExpand } } }, 0, 3);
_calendarEventListView = new NoHighlightListView { HorizontalOptions = LayoutOptions.Fill, VerticalOptions = LayoutOptions.Fill, BackgroundColor = Color.Transparent };
var calendarEventItemTemplate = new DataTemplate(() => new CalendarEventItemTemplate());
calendarEventItemTemplate.CreateContent();
_calendarEventListView.SeparatorVisibility = SeparatorVisibility.None;
_calendarEventListView.ItemsSource = _calendarEvents;
_calendarEventListView.ItemTemplate = calendarEventItemTemplate;
_calendarEventListView.HasUnevenRows = true;
_calendarEventListView.ItemTapped += (sender, e) => {
if (e.Item == null) {
return;
}
((ListView)sender).SelectedItem = null;
};
_contentGrid.Children.Add(_calendarEventListView, 0, 2);
_messageListView = new NoHighlightListView { HorizontalOptions = LayoutOptions.Fill, VerticalOptions = LayoutOptions.Fill, BackgroundColor = Color.Transparent };
var messageItemTemplate = new DataTemplate(() => new MessageItemTemplate());
messageItemTemplate.CreateContent();
_messageListView.SeparatorVisibility = SeparatorVisibility.None;
_messageListView.ItemsSource = _messages;
_messageListView.ItemTemplate = messageItemTemplate;
_messageListView.HasUnevenRows = true;
_messageListView.ItemTapped += (sender, e) => {
if (e.Item == null) {
return;
}
((ListView)sender).SelectedItem = null;
};
_contentGrid.Children.Add(_messageListView, 0, 4);
Button refreshButton = new Button { Text = "Refresh", TextColor = Color.White, FontSize = 18, VerticalOptions = LayoutOptions.CenterAndExpand, HorizontalOptions = LayoutOptions.EndAndExpand, BackgroundColor = Color.Transparent };
refreshButton.Clicked += RefreshButton_Clicked;
_contentGrid.Children.Add(new StackLayout { Orientation = StackOrientation.Horizontal, Children = { refreshButton }, Padding = new Thickness(0,0,10,0) }, 0, 5);
_backgroundGrid.Children.Add(_contentGrid, 0, 0);
}
