Feature/control hint

src/InvvardDev.EZLayoutDisplay.Desktop/Skins/DisplayLayoutSkin.xaml

@@ -2,28 +2,40 @@
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
 
     <Style TargetType="StackPanel" x:Key="SpLayerNameStyle">
-        <Setter Property="Height" Value="100" />
         <Setter Property="Width" Value="180" />
         <Setter Property="Margin" Value="0,25,0,0" />
         <Setter Property="HorizontalAlignment" Value="Center" />
         <Setter Property="VerticalAlignment" Value="Top" />
     </Style>
 
+    <Style TargetType="StackPanel" x:Key="SpControlHintStyle">
+        <Setter Property="Margin" Value="0,0,10,10" />
+        <Setter Property="HorizontalAlignment" Value="Right" />
+        <Setter Property="VerticalAlignment" Value="Bottom" />
+    </Style>
+
     <Style TargetType="TextBlock" x:Key="TextblockLayerNameStyle">
-        <Setter Property="TextAlignment" Value="Center" />
-        <Setter Property="Margin" Value="5,5,5,0" />
         <Setter Property="FontWeight" Value="Bold" />
         <Setter Property="TextWrapping" Value="WrapWithOverflow" />
     </Style>
 
     <Style TargetType="TextBlock" BasedOn="{StaticResource TextblockLayerNameStyle}" x:Key="TbLayerNameTitleStyle">
+        <Setter Property="TextAlignment" Value="Center" />
         <Setter Property="Foreground" Value="#BBB" />
         <Setter Property="FontSize" Value="14" />
     </Style>
 
     <Style TargetType="TextBlock" BasedOn="{StaticResource TextblockLayerNameStyle}" x:Key="TbLayerNameStyle">
+        <Setter Property="TextAlignment" Value="Center" />
         <Setter Property="Foreground" Value="#555" />
         <Setter Property="FontSize" Value="16" />
     </Style>
 
+    <Style TargetType="TextBlock" BasedOn="{StaticResource TextblockLayerNameStyle}" x:Key="TbControlHintStyle">
+        <Setter Property="TextAlignment" Value="Right" />
+        <Setter Property="Foreground" Value="#555" />
+        <Setter Property="FontSize" Value="12" />
+    </Style>
+
+
 </ResourceDictionary>

src/InvvardDev.EZLayoutDisplay.Desktop/View/DisplayLayoutWindow.xaml

@@ -42,11 +42,18 @@
                 </ItemsPanelTemplate>
             </ItemsControl.ItemsPanel>
         </ItemsControl>
+
         <StackPanel Style="{StaticResource SpLayerNameStyle}"
                     Visibility="{Binding NoLayoutAvailable, Converter={StaticResource BoolToVisibleConverter}}">
             <TextBlock Text="{Binding CurrentLayerNameTitle}" Style="{StaticResource TbLayerNameTitleStyle}" />
             <TextBlock Text="{Binding CurrentLayerName}" Style="{StaticResource TbLayerNameStyle}" />
         </StackPanel>
+
+        <StackPanel Style="{StaticResource SpControlHintStyle}"
+            Visibility="{Binding NoLayoutAvailable, Converter={StaticResource BoolToVisibleConverter}}">
+            <TextBlock Text="{Binding ControlHintLabel}" Style="{StaticResource TbControlHintStyle}" />
+        </StackPanel>
+
         <Grid Visibility="{Binding NoLayoutAvailable, Converter={StaticResource BoolToHiddenConverter}}" Width="350">
             <Grid.ColumnDefinitions>
                 <ColumnDefinition Width=".25*"/>

src/InvvardDev.EZLayoutDisplay.Desktop/ViewModel/DisplayLayoutViewModel.cs

@@ -43,6 +43,7 @@ public class DisplayLayoutViewModel : ViewModelBase
         private string _noLayoutWarningSecondLine;
         private string _currentLayerNameTitle;
         private string _currentLayerName;
+        private string _controlHintLabel;
         private bool _noLayoutAvailable;
 
         #endregion
@@ -94,6 +95,15 @@ public string CurrentLayerName
             private set => Set(ref _currentLayerName, value);
         }
 
+        /// <summary>
+        /// Gets or sets the control hint label.
+        /// </summary>
+        public string ControlHintLabel
+        {
+            get => _controlHintLabel;
+            private set => Set(ref _controlHintLabel, value);
+        }
+
         /// <summary>
         /// Gets or sets the no layout available indicator.
         /// </summary>
@@ -166,6 +176,7 @@ private void SetLabelUi()
             NoLayoutWarningSecondLine = "Please, go to the settings and update the layout.";
             CurrentLayerNameTitle = "Current layer :";
             CurrentLayerName = "";
+            ControlHintLabel = "Press 'Space' to display next layer";
         }
 
         private async void LoadCompleteLayout()

src/InvvardDev.EZLayoutDisplay.Tests/ViewModel/DisplayLayoutViewModelTest.cs

@@ -11,7 +11,7 @@ namespace InvvardDev.EZLayoutDisplay.Tests.ViewModel
     public class DisplayLayoutViewModelTest
     {
         [ Fact ]
-        public void DisplayLayoutViewModelConstructor()
+        public void DisplayLayoutViewModel_Constructor()
         {
             //Arrange
             var mockWindowService = new Mock<IWindowService>();
@@ -40,6 +40,7 @@ public void DisplayLayoutViewModelConstructor()
             Assert.Equal("Please, go to the settings and update the layout.", displayLayoutViewModel.NoLayoutWarningSecondLine);
             Assert.Equal("Current layer :", displayLayoutViewModel.CurrentLayerNameTitle);
             Assert.Equal("", displayLayoutViewModel.CurrentLayerName);
+            Assert.Equal("Press 'Space' to display next layer", displayLayoutViewModel.ControlHintLabel);
         }
 
         [ Fact ]