Ability to hide underline. Fixes #212, #128.

Author: ButchersBoy

MainDemo.Wpf/ColorZones.xaml

@@ -55,7 +55,9 @@
                                     </Canvas>
                                 </Viewbox>
                             </Button>
-                            <TextBox Grid.Column="1" Margin="8 0 0 0" materialDesign:TextFieldAssist.Hint="Build a search bar" MinWidth="200" VerticalAlignment="Center" />
+                            <TextBox Grid.Column="1" Margin="8 0 0 0" materialDesign:TextFieldAssist.Hint="Build a search bar" 
+                                     materialDesign:TextFieldAssist.DecorationVisibility="Hidden" BorderThickness="0"
+                                     MinWidth="200" VerticalAlignment="Center" />
                             <Button Style="{DynamicResource MaterialDesignToolButton}" Grid.Column="2">
                                 <Viewbox Width="16" Height="16" Margin="8 0 0 0" Opacity=".56">
                                     <Canvas Width="24" Height="24">

MaterialDesignThemes.Wpf/TextFieldAssist.cs

@@ -104,6 +104,30 @@ public static void SetHintOpacity(DependencyObject element, double value)
             element.SetValue(HintOpacityProperty, value);
         }
 
+        /// <summary>
+        /// Controls the visibility of the underline decoration.
+        /// </summary>
+        public static readonly DependencyProperty DecorationVisibilityProperty = DependencyProperty.RegisterAttached(
+            "DecorationVisibility", typeof (Visibility), typeof (TextFieldAssist), new PropertyMetadata(default(Visibility)));
+
+        /// <summary>
+        /// Controls the visibility of the underline decoration.
+        /// </summary>
+        public static void SetDecorationVisibility(DependencyObject element, Visibility value)
+        {
+            element.SetValue(DecorationVisibilityProperty, value);
+        }
+
+        /// <summary>
+        /// Controls the visibility of the underline decoration.
+        /// </summary>
+        /// <param name="element"></param>
+        /// <returns></returns>
+        public static Visibility GetDecorationVisibility(DependencyObject element)
+        {
+            return (Visibility) element.GetValue(DecorationVisibilityProperty);
+        }
+
         /// <summary>
         /// Internal framework use only.
         /// </summary>
@@ -165,9 +189,7 @@ public static void SetManaged(DependencyObject element, TextBox value)
         public static TextBox GetManaged(DependencyObject element)
         {
             return (TextBox) element.GetValue(ManagedProperty);
-        }
-
-        
+        }        
 
         #region Methods
 

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.ComboBox.xaml

@@ -455,7 +455,7 @@
         <ControlTemplate.Triggers>
             <Trigger Property="IsEditable" Value="True">
                 <Setter TargetName="PART_EditableTextBox" Property="Visibility" Value="Visible" />
-                <Setter TargetName="Underline" Property="Visibility" Value="Visible" />
+                <Setter TargetName="Underline" Property="Visibility" Value="{Binding Path=(wpf:TextFieldAssist.DecorationVisibility), RelativeSource={RelativeSource TemplatedParent}}" />
                 <Setter TargetName="contentPresenter" Property="Visibility" Value="Collapsed" />
             </Trigger>
             <MultiTrigger>
@@ -630,7 +630,7 @@
 
             <Trigger Property="IsEditable" Value="True">
                 <Setter TargetName="PART_EditableTextBox" Property="Visibility" Value="Visible" />
-                <Setter TargetName="Underline" Property="Visibility" Value="Visible" />
+                <Setter TargetName="Underline" Property="Visibility" Value="{Binding Path=(wpf:TextFieldAssist.DecorationVisibility), RelativeSource={RelativeSource TemplatedParent}}" />
                 <Setter TargetName="contentPresenter" Property="Visibility" Value="Collapsed" />
             </Trigger>
             <MultiTrigger>

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.DatePicker.xaml

@@ -169,7 +169,7 @@
 					    			   PopupAnimation="Fade"  />
                             </Grid>
                         </Border>
-                        <wpf:Underline x:Name="Underline" />
+                        <wpf:Underline x:Name="Underline" Visibility="{Binding Path=(wpf:TextFieldAssist.DecorationVisibility), RelativeSource={RelativeSource TemplatedParent}}"/>
                     </Grid>
                     <ControlTemplate.Triggers>
 						<Trigger Property="IsEnabled" Value="false">

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.PasswordBox.xaml

@@ -46,7 +46,7 @@
                                            Opacity="{Binding Path=(wpf:TextFieldAssist.HintOpacity), RelativeSource={RelativeSource TemplatedParent}}" />
                             </Grid>
                         </Border>
-                        <wpf:Underline x:Name="Underline"/>
+                        <wpf:Underline x:Name="Underline" Visibility="{Binding Path=(wpf:TextFieldAssist.DecorationVisibility), RelativeSource={RelativeSource TemplatedParent}}"/>
                     </Grid>
                     <ControlTemplate.Triggers>
                         <Trigger Property="IsEnabled" Value="false">
@@ -177,7 +177,7 @@
                                            />
                             </Grid>
                         </Border>
-                        <wpf:Underline x:Name="Underline"/>
+                        <wpf:Underline x:Name="Underline" Visibility="{Binding Path=(wpf:TextFieldAssist.DecorationVisibility), RelativeSource={RelativeSource TemplatedParent}}"/>
                     </Grid>
                     <ControlTemplate.Triggers>
                         <MultiTrigger>

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.TextBox.xaml

@@ -80,7 +80,7 @@
                                            Opacity="{Binding Path=(wpf:TextFieldAssist.HintOpacity), RelativeSource={RelativeSource TemplatedParent}}"/>
                             </Grid>
                         </Border>
-                        <wpf:Underline x:Name="Underline"/>
+                        <wpf:Underline x:Name="Underline" Visibility="{Binding Path=(wpf:TextFieldAssist.DecorationVisibility), RelativeSource={RelativeSource TemplatedParent}}"/>
                     </Grid>
                     <ControlTemplate.Triggers>
                         <Trigger Property="IsEnabled" Value="false">
@@ -213,7 +213,7 @@
                                            />
                             </Grid>
                         </Border>
-                        <wpf:Underline x:Name="Underline"/>
+                        <wpf:Underline x:Name="Underline" Visibility="{Binding Path=(wpf:TextFieldAssist.DecorationVisibility), RelativeSource={RelativeSource TemplatedParent}}"/>
                     </Grid>
                     <ControlTemplate.Triggers>
                         <MultiTrigger>

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.TimePicker.xaml

@@ -98,7 +98,7 @@
 						    		   PopupAnimation="Fade"/>
 						    </Grid>
                         </Border>
-                        <wpf:Underline x:Name="Underline" />
+                        <wpf:Underline x:Name="Underline" Visibility="{Binding Path=(wpf:TextFieldAssist.DecorationVisibility), RelativeSource={RelativeSource TemplatedParent}}"/>
                     </Grid>
                     <ControlTemplate.Triggers>
 						<Trigger Property="IsMouseOver" Value="true">