minor ux improvement.

Author: magicnat

ChuniVController/ChuniVController/MainWindow.xaml

@@ -30,11 +30,11 @@
 
         <StackPanel Orientation="Horizontal" HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="1" MouseEnter="SetAllowFocus" MouseLeave="SetDenyFocus" >
             <Label Content="Key width:"  />
-            <TextBox x:Name="KeyWidth" Text="120" Width="60" MouseEnter="SetAllowFocus" MouseLeave="SetDenyFocus" Height="17" />
+            <TextBox x:Name="KeyWidth" PreviewTextInput="NumericValidation"  Text="120" Width="60" MouseEnter="SetAllowFocus" MouseLeave="SetDenyFocus" Height="17" />
             <Label Margin="3,0,0,0" Content="Key height:" HorizontalAlignment="Left" />
-            <TextBox x:Name="KeyHeight"  HorizontalAlignment="Left" Text="250" Width="60" Height="17" />
+            <TextBox x:Name="KeyHeight" PreviewTextInput="NumericValidation"  HorizontalAlignment="Left" Text="250" Width="60" Height="17" />
             <Label Margin="3,0,0,0" Content="Sensor height:" />
-            <TextBox x:Name="AirHeight"  Text="300" Margin="3,0,0,0" Width="60" Height="17" />
+            <TextBox x:Name="AirHeight" PreviewTextInput="NumericValidation" Text="300" Margin="3,0,0,0" Width="60" Height="17" />
             <Button Margin="3" Content="Apply" HorizontalAlignment="Left"  Width="75" Click="DoApply" IsDefault="True" />
             <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
             <Label Content="Opacity" />

ChuniVController/ChuniVController/MainWindow.xaml.cs

@@ -86,6 +86,22 @@ private void Render()
             }
         }
 
+        protected override void OnPreviewKeyDown(KeyEventArgs e)
+        {
+            if (e.Key == Key.Space) e.Handled = true; // so that checkboxes won't be trigger by the IR sensor simulation
+            base.OnPreviewKeyDown(e);
+        }
+
+        private void NumericValidation(object sender, TextCompositionEventArgs e)
+        {
+            int _;
+            e.Handled = !int.TryParse(e.Text, out _);
+            if (e.Handled && e.Text.Equals(".") && ((TextBox) sender).Text.IndexOf('.') == -1)
+            {
+                e.Handled = false;
+            }
+        }
+
         private void SetAllowFocus(object sender, RoutedEventArgs e)
         {
             AllowFocus();