Use VisualStates to manage the placement of the flyout

NotificationFlyout.Sample/NotificationFlyoutPresenter.xaml

@@ -2,8 +2,7 @@
     x:Class="NotificationFlyout.Sample.NotificationFlyoutPresenter"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-    xmlns:controls="using:NotificationFlyout.Uwp.UI.Controls"
+    xmlns:controls="using:NotificationFlyout.Uwp.UI.Controls">
-    CornerRadius="4">
     <Grid>
         <ListBox
             Width="300"

NotificationFlyout.Uwp.UI.Controls/NotificationFlyout.Uwp.UI.Controls.csproj

@@ -122,7 +122,6 @@
   <ItemGroup>
     <Compile Include="NotificationFlyoutHost\NotificationFlyoutHost.cs" />
     <Compile Include="NotificationFlyoutPresenter\NotificationFlyoutPresenter.cs" />
-    <Compile Include="NotificationFlyoutHost\NotificationFlyoutHostTemplateSettings.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <EmbeddedResource Include="Properties\NotificationFlyout.Uwp.UI.Controls.rd.xml" />
   </ItemGroup>

NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutHost/NotificationFlyoutHost.cs

@@ -11,20 +11,13 @@ namespace NotificationFlyout.Uwp.UI.Controls
                 typeof(NotificationFlyoutPresenter), typeof(NotificationFlyoutHost),
                 new PropertyMetadata(null));
 
-        public static readonly DependencyProperty TemplateSettingsProperty =
+        private bool _isLoaded;
-            DependencyProperty.Register(nameof(TemplateSettings),
+        private string _placement;
-                typeof(NotificationFlyoutHostTemplateSettings), typeof(NotificationFlyoutHost),
-                new PropertyMetadata(null));
-
-        private readonly NotificationFlyoutHostTemplateSettings _templateSettings;
         private Grid _root;
 
         public NotificationFlyoutHost()
         {
             DefaultStyleKey = typeof(NotificationFlyoutHost);
-
-            _templateSettings = new NotificationFlyoutHostTemplateSettings();
-            SetValue(TemplateSettingsProperty, _templateSettings);
         }
 
         public NotificationFlyoutPresenter FlyoutPresenter
@@ -33,12 +26,6 @@ namespace NotificationFlyout.Uwp.UI.Controls
             set => SetValue(FlyoutPresenterProperty, value);
         }
 
-        public NotificationFlyoutHostTemplateSettings TemplateSettings
-        {
-            get => (NotificationFlyoutHostTemplateSettings)GetValue(TemplateSettingsProperty);
-            set => SetValue(TemplateSettingsProperty, value);
-        }
-
         public void HideFlyout()
         {
             if (_root == null) return;
@@ -46,11 +33,14 @@ namespace NotificationFlyout.Uwp.UI.Controls
             flyout.Hide();
         }
 
-        public void SetOffset(double verticalOffset, double horizontalOffset)
+        public void SetFlyoutPlacement(string placement)
         {
-            if (_templateSettings == null) return;
+            if (!_isLoaded)
-            _templateSettings.FromVerticalOffset = verticalOffset;
+            {
-            _templateSettings.FromHorizontalOffset = horizontalOffset;
+                _placement = placement;
+            }
+
+            VisualStateManager.GoToState(this, placement, true);
         }
 
         public void ShowFlyout(FlyoutPlacementMode placementMode)
@@ -60,13 +50,15 @@ namespace NotificationFlyout.Uwp.UI.Controls
             flyout.ShowAt(_root, new FlyoutShowOptions
             {
                 Placement = placementMode,
-                ShowMode = FlyoutShowMode.Standard
+                ShowMode = FlyoutShowMode.Standard,
-            });
+            });       
         }
 
         protected override void OnApplyTemplate()
         {
             _root = GetTemplateChild("Root") as Grid;
+            _isLoaded = true;
+            SetFlyoutPlacement(_placement);
         }
     }
 }

NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutHost/NotificationFlyoutHost.xaml

@@ -7,20 +7,88 @@
             <Setter.Value>
                 <ControlTemplate TargetType="controls:NotificationFlyoutHost">
                     <Grid x:Name="Root">
+                        <Grid.Resources>
+                            <Style x:Key="DefaultFlyoutPresenterStyle" TargetType="FlyoutPresenter">
+                                <Setter Property="BorderThickness" Value="0" />
+                                <Setter Property="Background" Value="Transparent" />
+                                <Setter Property="IsDefaultShadowEnabled" Value="False" />
+                                <Setter Property="Padding" Value="0" />
+                            </Style>
+                            <Style
+                                x:Key="TopFlyoutPresenterStyle"
+                                BasedOn="{StaticResource DefaultFlyoutPresenterStyle}"
+                                TargetType="FlyoutPresenter">
+                                <Setter Property="Margin" Value="0,-5,0,0" />
+                            </Style>
+                            <Style
+                                x:Key="BottomFlyoutPresenterStyle"
+                                BasedOn="{StaticResource DefaultFlyoutPresenterStyle}"
+                                TargetType="FlyoutPresenter">
+                                <Setter Property="Margin" Value="0,5,0,0" />
+                            </Style>
+                            <Style
+                                x:Key="LeftFlyoutPresenterStyle"
+                                BasedOn="{StaticResource DefaultFlyoutPresenterStyle}"
+                                TargetType="FlyoutPresenter">
+                                <Setter Property="Margin" Value="-5,0,0,0" />
+                            </Style>
+                            <Style
+                                x:Key="RightFlyoutPresenterStyle"
+                                BasedOn="{StaticResource DefaultFlyoutPresenterStyle}"
+                                TargetType="FlyoutPresenter">
+                                <Setter Property="Margin" Value="5,0,0,0" />
+                            </Style>
+                        </Grid.Resources>
                         <FlyoutBase.AttachedFlyout>
-                            <Flyout AreOpenCloseAnimationsEnabled="False" ShouldConstrainToRootBounds="False">
+                            <Flyout
-                                <Flyout.FlyoutPresenterStyle>
+                                x:Name="Flyout"
-                                    <Style TargetType="FlyoutPresenter">
+                                AreOpenCloseAnimationsEnabled="False"
-                                        <Setter Property="BorderThickness" Value="0" />
+                                FlyoutPresenterStyle="{StaticResource BottomFlyoutPresenterStyle}"
-                                        <Setter Property="Background" Value="Transparent" />
+                                ShouldConstrainToRootBounds="False">
-                                        <Setter Property="IsDefaultShadowEnabled" Value="False" />
+                                <ContentControl Content="{TemplateBinding FlyoutPresenter}">
-                                        <Setter Property="Padding" Value="0" />
+                                    <ContentControl.Transitions>
-                                        <Setter Property="Margin" Value="0" />
+                                        <TransitionCollection>
-                                    </Style>
+                                            <EntranceThemeTransition
-                                </Flyout.FlyoutPresenterStyle>
+                                                x:Name="EntranceThemeTransition"
-                                <ContentControl Content="{TemplateBinding FlyoutPresenter}" />
+                                                FromHorizontalOffset="0"
+                                                FromVerticalOffset="0" />
+                                        </TransitionCollection>
+                                    </ContentControl.Transitions>
+                                </ContentControl>
                             </Flyout>
                         </FlyoutBase.AttachedFlyout>
+                        <VisualStateManager.VisualStateGroups>
+                            <VisualStateGroup x:Name="PlacementStates">
+                                <VisualState x:Name="Bottom">
+                                    <VisualState.Setters>
+                                        <Setter Target="Flyout.FlyoutPresenterStyle" Value="{StaticResource BottomFlyoutPresenterStyle}" />
+                                        <Setter Target="EntranceThemeTransition.FromHorizontalOffset" Value="0" />
+                                        <Setter Target="EntranceThemeTransition.FromVerticalOffset" Value="80" />
+                                    </VisualState.Setters>
+                                </VisualState>
+                                <VisualState x:Name="Top">
+                                    <VisualState.Setters>
+                                        <Setter Target="Flyout.FlyoutPresenterStyle" Value="{StaticResource TopFlyoutPresenterStyle}" />
+                                        <Setter Target="EntranceThemeTransition.FromHorizontalOffset" Value="0" />
+                                        <Setter Target="EntranceThemeTransition.FromVerticalOffset" Value="-80" />
+                                    </VisualState.Setters>
+                                </VisualState>
+                                <VisualState x:Name="Left">
+                                    <VisualState.Setters>
+                                        <Setter Target="Flyout.FlyoutPresenterStyle" Value="{StaticResource LeftFlyoutPresenterStyle}" />
+                                        <Setter Target="EntranceThemeTransition.FromHorizontalOffset" Value="-80" />
+                                        <Setter Target="EntranceThemeTransition.FromVerticalOffset" Value="0" />
+                                    </VisualState.Setters>
+                                </VisualState>
+                                <VisualState x:Name="Right">
+                                    <VisualState.Setters>
+                                        <Setter Target="Flyout.FlyoutPresenterStyle" Value="{StaticResource RightFlyoutPresenterStyle}" />
+                                        <Setter Target="EntranceThemeTransition.FromHorizontalOffset" Value="80" />
+                                        <Setter Target="EntranceThemeTransition.FromVerticalOffset" Value="0" />
+                                    </VisualState.Setters>
+                                </VisualState>
+                            </VisualStateGroup>
+                        </VisualStateManager.VisualStateGroups>
                     </Grid>
                 </ControlTemplate>
             </Setter.Value>

NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutHost/NotificationFlyoutHostTemplateSettings.cs

@@ -1,29 +0,0 @@
-using Windows.UI.Xaml;
-
-namespace NotificationFlyout.Uwp.UI.Controls
-{
-    public class NotificationFlyoutHostTemplateSettings : DependencyObject
-    {
-        public static readonly DependencyProperty FromHorizontalOffsetProperty =
-            DependencyProperty.Register(nameof(FromHorizontalOffset),
-                typeof(double), typeof(NotificationFlyoutHostTemplateSettings),
-                new PropertyMetadata(0d));
-
-        public static readonly DependencyProperty FromVerticalOffsetProperty =
-            DependencyProperty.Register(nameof(FromVerticalOffset),
-                typeof(double), typeof(NotificationFlyoutHostTemplateSettings),
-                new PropertyMetadata(0d));
-
-        public double FromHorizontalOffset
-        {
-            get => (double)GetValue(FromHorizontalOffsetProperty);
-            set => SetValue(FromHorizontalOffsetProperty, value);
-        }
-
-        public double FromVerticalOffset
-        {
-            get => (double)GetValue(FromVerticalOffsetProperty);
-            set => SetValue(FromVerticalOffsetProperty, value);
-        }
-    }
-}

NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutPresenter/NotificationFlyoutPresenter.xaml

@@ -14,11 +14,6 @@
                         BorderBrush="{TemplateBinding BorderBrush}"
                         BorderThickness="{TemplateBinding BorderThickness}"
                         CornerRadius="{TemplateBinding CornerRadius}">
-                        <Border.Transitions>
-                            <TransitionCollection>
-                                <EntranceThemeTransition FromHorizontalOffset="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.FromHorizontalOffset, Mode=TwoWay}" FromVerticalOffset="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.FromVerticalOffset, Mode=TwoWay}" />
-                            </TransitionCollection>
-                        </Border.Transitions>
                         <ScrollViewer
                             x:Name="ScrollViewer"
                             AutomationProperties.AccessibilityView="Raw"

NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyoutXamlHost.cs

@@ -88,10 +88,6 @@ namespace NotificationFlyout.Wpf.UI.Controls
 
         private void OnTaskbarChanged(object sender, EventArgs args)
         {
-            var taskbarState = _taskbarHelper.GetCurrentState();
-            Left = taskbarState.Screen.WorkingArea.Left;
-            Top = taskbarState.Screen.WorkingArea.Top;
-
             UpdateWindow();
         }
 
@@ -102,9 +98,9 @@ namespace NotificationFlyout.Wpf.UI.Controls
             WindowStyle = WindowStyle.None;
             ResizeMode = ResizeMode.NoResize;
             AllowsTransparency = true;
-            Background = new SolidColorBrush(Colors.Transparent);
+            Background = new SolidColorBrush(Colors.Red);
-            Height = 5;
+            Height = 0;
-            Width = 5;
+            Width = 0;
         }
 
         private void PrepareNotificationIcon()
@@ -139,19 +135,14 @@ namespace NotificationFlyout.Wpf.UI.Controls
 
             var taskbarState = _taskbarHelper.GetCurrentState();
 
-            var screen = Screen.FromHandle(this.GetHandle());
+            Left = taskbarState.Screen.WorkingArea.Left;
-            MaxHeight = screen.Bounds.Height / 2;
+            Top = taskbarState.Screen.WorkingArea.Top;
 
-            var windowWidth = DesiredSize.Width * this.DpiX();
+            var windowWidth = 0 * this.DpiX();
-            var windowHeight = DesiredSize.Height * this.DpiY();
+            var windowHeight = 0 * this.DpiY();
-
-            double top;
-            double left;
-            double height;
-            double width;
-            double verticalOffset = 0;
-            double horizontalOffset = 0;
 
+            double top, left, height, width;
+       
             var taskbarRect = taskbarState.Rect;
             switch (taskbarState.Position)
             {
@@ -160,35 +151,31 @@ namespace NotificationFlyout.Wpf.UI.Controls
                     left = taskbarRect.Right;
                     height = windowHeight;
                     width = windowWidth;
-                    horizontalOffset = -MaximumOffset;
                     break;
                 case TaskbarPosition.Top:
                     top = taskbarRect.Bottom;
                     left = FlowDirection == FlowDirection.RightToLeft ? taskbarRect.Left : taskbarRect.Right - windowWidth;
                     height = windowHeight;
                     width = windowWidth;
-                    verticalOffset = -MaximumOffset;
                     break;
                 case TaskbarPosition.Right:
                     top = taskbarRect.Bottom - windowHeight;
                     left = taskbarRect.Left - windowWidth;
                     height = windowHeight;
                     width = windowWidth;
-                    horizontalOffset = MaximumOffset;
                     break;
                 case TaskbarPosition.Bottom:
                     top = taskbarRect.Top - windowHeight;
                     left = FlowDirection == FlowDirection.RightToLeft ? taskbarRect.Left : taskbarRect.Right - windowWidth;
                     height = windowHeight;
                     width = windowWidth;
-                    verticalOffset = MaximumOffset;
                     break;
                 default:
                     throw new ArgumentOutOfRangeException();
             }
 
             this.SetWindowPosition(top, left, height, width);
-            flyoutHost.SetOffset(verticalOffset, horizontalOffset);
+            flyoutHost.SetFlyoutPlacement(taskbarState.Position.ToString());
         }
     }
 }