Handling of basic all-day events for calendar.

Wino.Calendar/Controls/AllDayItemsControl.xaml

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+<UserControl
+    x:Class="Wino.Calendar.Controls.AllDayItemsControl"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:controls="using:Wino.Calendar.Controls"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:domain="using:Wino.Core.Domain"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    d:DesignHeight="300"
+    d:DesignWidth="400"
+    mc:Ignorable="d">
+
+    <Grid>
+        <ScrollViewer x:Name="PART_AllDayItemsListScrollHost">
+            <ItemsControl
+                x:Name="PART_AllDayItemsList"
+                ItemTemplate="{x:Bind AllDayEventTemplate}"
+                ItemsSource="{x:Bind AllDayEvents, Mode=OneWay}" />
+        </ScrollViewer>
+        <Button
+            x:Name="AllDayItemsSummaryButton"
+            HorizontalAlignment="Stretch"
+            VerticalAlignment="Stretch"
+            Visibility="Collapsed">
+            <Button.Flyout>
+                <Flyout Placement="Bottom">
+                    <ScrollViewer>
+                        <ItemsControl ItemTemplate="{x:Bind AllDayEventTemplate}" ItemsSource="{x:Bind AllDayEvents, Mode=OneWay}" />
+                    </ScrollViewer>
+                </Flyout>
+            </Button.Flyout>
+        </Button>
+
+        <VisualStateManager.VisualStateGroups>
+            <VisualStateGroup x:Name="ViewStates">
+                <VisualState x:Name="FullView" />
+                <VisualState x:Name="SummaryView">
+                    <VisualState.Setters>
+                        <Setter Target="PART_AllDayItemsListScrollHost.Visibility" Value="Collapsed" />
+                        <Setter Target="PART_AllDayItemsList.Visibility" Value="Collapsed" />
+                        <Setter Target="AllDayItemsSummaryButton.Visibility" Value="Visible" />
+                        <Setter Target="AllDayItemsSummaryButton.Content">
+                            <Setter.Value>
+                                <TextBlock>
+                                    <Run Text="{x:Bind AllDayEvents.Count, Mode=OneWay, TargetNullValue='0'}" /> <Run Text="{x:Bind domain:Translator.CalendarAllDayEventSummary}" />
+                                </TextBlock>
+                            </Setter.Value>
+                        </Setter>
+                    </VisualState.Setters>
+                </VisualState>
+            </VisualStateGroup>
+        </VisualStateManager.VisualStateGroups>
+    </Grid>
+</UserControl>

Wino.Calendar/Controls/AllDayItemsControl.xaml.cs

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+using System.Collections.ObjectModel;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Wino.Core.Domain.Interfaces;
+
+
+namespace Wino.Calendar.Controls
+{
+    public sealed partial class AllDayItemsControl : UserControl
+    {
+        private const string STATE_SummaryView = "SummaryView";
+        private const string STATE_FullView = "FullView";
+
+        #region Dependency Properties
+
+        public static readonly DependencyProperty AllDayEventsProperty = DependencyProperty.Register(nameof(AllDayEvents), typeof(ObservableCollection<ICalendarItem>), typeof(AllDayItemsControl), new PropertyMetadata(null, new PropertyChangedCallback(OnAllDayEventsChanged)));
+        public static readonly DependencyProperty AllDayEventTemplateProperty = DependencyProperty.Register(nameof(AllDayEventTemplate), typeof(DataTemplate), typeof(AllDayItemsControl), new PropertyMetadata(null));
+
+        public DataTemplate AllDayEventTemplate
+        {
+            get { return (DataTemplate)GetValue(AllDayEventTemplateProperty); }
+            set { SetValue(AllDayEventTemplateProperty, value); }
+        }
+
+        public ObservableCollection<ICalendarItem> AllDayEvents
+        {
+            get { return (ObservableCollection<ICalendarItem>)GetValue(AllDayEventsProperty); }
+            set { SetValue(AllDayEventsProperty, value); }
+        }
+
+        #endregion
+
+        public AllDayItemsControl()
+        {
+            InitializeComponent();
+        }
+
+        private static void OnAllDayEventsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            if (d is AllDayItemsControl control)
+            {
+                if (e.OldValue != null && e.OldValue is ObservableCollection<ICalendarItem> oldCollection)
+                {
+                    control.UnregisterEventCollectionChanged(oldCollection);
+                }
+
+                if (e.NewValue != null && e.NewValue is ObservableCollection<ICalendarItem> newCollection)
+                {
+                    control.RegisterEventCollectionChanged(newCollection);
+                }
+
+                control.UpdateCollectionVisuals();
+            }
+        }
+
+        private void RegisterEventCollectionChanged(ObservableCollection<ICalendarItem> collection)
+        {
+            collection.CollectionChanged += EventsCollectionUpdated;
+        }
+
+        private void UnregisterEventCollectionChanged(ObservableCollection<ICalendarItem> collection)
+        {
+            collection.CollectionChanged -= EventsCollectionUpdated;
+        }
+
+        private void EventsCollectionUpdated(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
+        {
+            UpdateCollectionVisuals();
+        }
+
+        private void UpdateCollectionVisuals()
+        {
+            if (AllDayEvents == null) return;
+
+            if (AllDayEvents.Count > 1)
+            {
+                // Summarize
+
+                VisualStateManager.GoToState(this, STATE_SummaryView, false);
+
+                // AllDayItemsSummaryButton.Content = $"{AllDayEvents.Count} {Translator.CalendarAllDayEventSummary}";
+            }
+            else
+            {
+                // Full view.
+                VisualStateManager.GoToState(this, STATE_FullView, false);
+            }
+        }
+    }
+}