/// <summary>
/// Expand the LoadingDataTemplate or use the template selector.
/// </summary>
/// <returns>The item view.</returns>
View CreateItemView(Layout <View> layout, StateControl.State state)
{
switch (state)
{
case StateControl.State.Loading:
return(CreateItemView(LoadingTemplate, state));
case StateControl.State.Saving:
return(CreateItemView(SavingTemplate, state));
case StateControl.State.Success:
return(CreateItemView(SuccessTemplate, state));
case StateControl.State.Error:
return(CreateItemView(ErrorTemplate, state));
case StateControl.State.Empty:
return(CreateItemView(EmptyTemplate, state));
case StateControl.State.None:
break;
}
return(null);
}
private int GetRepeatCount(StateControl.State state)
{
switch (state)
{
case StateControl.State.Loading:
return(LoadingTemplate != null ? LoadingTemplate.RepeatCount : 1);
case StateControl.State.Saving:
return(SavingTemplate != null ? SavingTemplate.RepeatCount : 1);
case StateControl.State.Success:
return(SuccessTemplate != null ? SuccessTemplate.RepeatCount : 1);
case StateControl.State.Error:
return(ErrorTemplate != null ? ErrorTemplate.RepeatCount : 1);
case StateControl.State.Empty:
return(EmptyTemplate != null ? EmptyTemplate.RepeatCount : 1);
case StateControl.State.None:
break;
}
return(1);
}
static void OnStateChanged(BindableObject bindable, StateControl.State oldValue, StateControl.State newValue)
{
// Swap out the current children for the Loading Template.
if (oldValue != newValue && newValue != StateControl.State.None)
{
GetLayoutController(bindable).SwitchToTemplate(newValue);
}
else if (oldValue != newValue && newValue == StateControl.State.None)
{
GetLayoutController(bindable).SwitchToContent();
}
}
/// <summary>
/// Expand the Loading Data Template.
/// </summary>
/// <returns>The item view.</returns>
/// <param name="dataTemplate">Data template.</param>
View CreateItemView(StateDataTemplate dataTemplate, StateControl.State state)
{
if (dataTemplate != null)
{
var view = (View)dataTemplate.Template.CreateContent();
return(view);
}
else
{
return(new Label()
{
Text = $"[{state.ToString()}Template] not defined."
});
}
}
public void SwitchToContent()
{
Layout <View> layout;
if (!_layoutWeakReference.TryGetTarget(out layout))
{
return;
}
_previousState = StateControl.State.None;
// Put the original content back in.
layout.Children.Clear();
foreach (var item in _originalContent)
{
layout.Children.Add(item);
}
}
private bool HasTemplateForState(StateControl.State state)
{
switch (state)
{
case StateControl.State.Loading:
return(LoadingTemplate != null);
case StateControl.State.Saving:
return(SavingTemplate != null);
case StateControl.State.Success:
return(SuccessTemplate != null);
case StateControl.State.Error:
return(ErrorTemplate != null);
case StateControl.State.Empty:
return(EmptyTemplate != null);
}
return(false);
}
public void SwitchToTemplate(StateControl.State state)
{
Layout <View> layout;
if (!_layoutWeakReference.TryGetTarget(out layout))
{
return;
}
// Put the original content somewhere where we can restore it.
if (_previousState == StateControl.State.None)
{
_originalContent = new List <View>();
foreach (var item in layout.Children)
{
_originalContent.Add(item);
}
}
if (HasTemplateForState(state))
{
_previousState = state;
// Add the loading template.
layout.Children.Clear();
var repeatCount = GetRepeatCount(state);
if (layout is Grid)
{
_layoutIsGrid = true;
if (_fullScreen && GetRepeatCount(state) <= 1)
{
//Do nothing.
}
else
{
layout.Children.Add(new StackLayout());
}
}
for (int i = 0; i < repeatCount; i++)
{
if (_layoutIsGrid && !_fullScreen && GetRepeatCount(state) > 1)
{
if (layout.Children[0] is StackLayout stack)
{
var view = CreateItemView(layout, state);
if (view != null)
{
stack.Children.Add(view);
}
}
}
else
{
var view = CreateItemView(layout, state);
if (_fullScreen && _layoutIsGrid)
{
var rowCount = ((Grid)layout).RowDefinitions.Count;
var columnCount = ((Grid)layout).ColumnDefinitions.Count;
if (rowCount > 0)
{
view.SetValue(Grid.RowSpanProperty, rowCount);
}
if (columnCount > 0)
{
view.SetValue(Grid.ColumnDefinitionsProperty, columnCount);
}
}
if (view != null)
{
layout.Children.Add(view);
}
}
}
}
}
public static void SetState(BindableObject b, StateControl.State value)
{
b.SetValue(StateProperty, value);
}
