private void Refresh(LayerContentViewModel layerContent, string propertyName)
{
if (propertyName == nameof(LayerContentViewModel.Sublayers))
{
var subLayers = layerContent?.Sublayers;
if (subLayers == null)
{
return;
}
if (_listView.Adapter == null)
{
_listView.Adapter = new LegendAdapter(Context, new List <LayerContentViewModel>(subLayers));
_listView.SetHeightBasedOnChildren();
}
else
{
(_listView.Adapter as LegendAdapter)?.NotifyDataSetChanged();
}
}
else if (propertyName == nameof(LayerContentViewModel.DisplayLegend))
{
Visibility = (layerContent?.DisplayLegend ?? false) ? ViewStates.Visible : ViewStates.Gone;
}
}
private void UpdateSublayers(LayerContentViewModel layerContent)
{
var subLayers = layerContent?.Sublayers;
if (subLayers == null)
{
_listView.Source = null;
_listView.ReloadData();
InvalidateIntrinsicContentSize();
return;
}
var source = new LegendTableSource(new List <LayerContentViewModel>(subLayers));
_listView.Source = source;
source.CollectionChanged += (a, b) => InvokeOnMainThread(() =>
{
_listView.ReloadData();
_listView.SetNeedsUpdateConstraints();
_listView.UpdateConstraints();
});
_listView.ReloadData();
_listView.SetNeedsUpdateConstraints();
_listView.UpdateConstraints();
}
internal void Update(LayerContentViewModel layerContent)
{
if (layerContent == null || !layerContent.DisplayLegend)
{
return;
}
_textLabel.Font = !layerContent.IsSublayer ?
UIFont.BoldSystemFontOfSize(UIFont.LabelFontSize)
: UIFont.SystemFontOfSize(UIFont.LabelFontSize);
_textLabel.Text = layerContent.LayerContent?.Name;
_layerLegend.LayerContent = layerContent.LayerContent;
UpdateSublayers(layerContent);
if (layerContent is INotifyPropertyChanged)
{
var inpc = layerContent as INotifyPropertyChanged;
var listener = new Internal.WeakEventListener <INotifyPropertyChanged, object, PropertyChangedEventArgs>(inpc)
{
OnEventAction = (instance, source, eventArgs) =>
{
Refresh(instance as LayerContentViewModel, eventArgs.PropertyName);
},
OnDetachAction = (instance, weakEventListener) => instance.PropertyChanged -= weakEventListener.OnEvent
};
inpc.PropertyChanged += listener.OnEvent;
}
InvalidateIntrinsicContentSize();
}
private void Refresh(LayerContentViewModel layerContent, string propertyName)
{
if (propertyName == nameof(LayerContentViewModel.Sublayers))
{
UpdateSublayers(layerContent);
}
else if (propertyName == nameof(LayerContentViewModel.DisplayLegend))
{
Hidden = layerContent?.DisplayLegend ?? false;
}
}
internal void Update(LayerContentViewModel layerContent)
{
if (layerContent == null)
{
return;
}
if (!layerContent.IsSublayer)
{
_textView.SetTypeface(null, TypefaceStyle.Bold);
}
else
{
_textView.SetPadding(10, 0, 0, 0);
_layerLegend.SetPadding(10, 0, 0, 0);
_listView.SetPadding(10, 0, 0, 0);
}
_textView.Text = layerContent.LayerContent?.Name;
_layerLegend.LayerContent = layerContent.LayerContent;
if (layerContent.Sublayers != null)
{
_listView.Adapter = new LegendAdapter(Context, new List <LayerContentViewModel>(layerContent.Sublayers));
_listView.SetHeightBasedOnChildren();
}
if (layerContent is INotifyPropertyChanged)
{
var inpc = layerContent as INotifyPropertyChanged;
var listener = new Internal.WeakEventListener <INotifyPropertyChanged, object, PropertyChangedEventArgs>(inpc)
{
OnEventAction = (instance, source, eventArgs) =>
{
Refresh(instance as LayerContentViewModel, eventArgs.PropertyName);
},
OnDetachAction = (instance, weakEventListener) => instance.PropertyChanged -= weakEventListener.OnEvent
};
inpc.PropertyChanged += listener.OnEvent;
}
}
