Avalonia/src/Avalonia.Themes.Simple/Controls/TextBox.xaml

<ResourceDictionary xmlns="https://github.com/avaloniaui"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <StreamGeometry x:Key="TextBoxClearButtonData">M 11.416016,10 20,1.4160156 18.583984,0 10,8.5839846 1.4160156,0 0,1.4160156 8.5839844,10 0,18.583985 1.4160156,20 10,11.416015 18.583984,20 20,18.583985 Z</StreamGeometry>
  <StreamGeometry x:Key="PasswordBoxRevealButtonData">m10.051 7.0032c2.215 0 4.0105 1.7901 4.0105 3.9984s-1.7956 3.9984-4.0105 3.9984c-2.215 0-4.0105-1.7901-4.0105-3.9984s1.7956-3.9984 4.0105-3.9984zm0 1.4994c-1.3844 0-2.5066 1.1188-2.5066 2.499s1.1222 2.499 2.5066 2.499 2.5066-1.1188 2.5066-2.499-1.1222-2.499-2.5066-2.499zm0-5.0026c4.6257 0 8.6188 3.1487 9.7267 7.5613 0.10085 0.40165-0.14399 0.80877-0.54686 0.90931-0.40288 0.10054-0.81122-0.14355-0.91208-0.54521-0.94136-3.7492-4.3361-6.4261-8.2678-6.4261-3.9334 0-7.3292 2.6792-8.2689 6.4306-0.10063 0.40171-0.50884 0.64603-0.91177 0.54571s-0.648-0.5073-0.54737-0.90901c1.106-4.4152 5.1003-7.5667 9.728-7.5667z</StreamGeometry>
  <StreamGeometry x:Key="PasswordBoxHideButtonData">m0.21967 0.21965c-0.26627 0.26627-0.29047 0.68293-0.07262 0.97654l0.07262 0.08412 4.0346 4.0346c-1.922 1.3495-3.3585 3.365-3.9554 5.7495-0.10058 0.4018 0.14362 0.8091 0.54543 0.9097 0.40182 0.1005 0.80909-0.1436 0.90968-0.5455 0.52947-2.1151 1.8371-3.8891 3.5802-5.0341l1.8096 1.8098c-0.70751 0.7215-1.1438 1.71-1.1438 2.8003 0 2.2092 1.7909 4 4 4 1.0904 0 2.0788-0.4363 2.8004-1.1438l5.9193 5.9195c0.2929 0.2929 0.7677 0.2929 1.0606 0 0.2663-0.2662 0.2905-0.6829 0.0726-0.9765l-0.0726-0.0841-6.1135-6.1142 0.0012-0.0015-1.2001-1.1979-2.8699-2.8693 2e-3 -8e-4 -2.8812-2.8782 0.0012-0.0018-1.1333-1.1305-4.3064-4.3058c-0.29289-0.29289-0.76777-0.29289-1.0607 0zm7.9844 9.0458 3.5351 3.5351c-0.45 0.4358-1.0633 0.704-1.7392 0.704-1.3807 0-2.5-1.1193-2.5-2.5 0-0.6759 0.26824-1.2892 0.7041-1.7391zm1.7959-5.7655c-1.0003 0-1.9709 0.14807-2.8889 0.425l1.237 1.2362c0.5358-0.10587 1.0883-0.16119 1.6519-0.16119 3.9231 0 7.3099 2.6803 8.2471 6.4332 0.1004 0.4018 0.5075 0.6462 0.9094 0.5459 0.4019-0.1004 0.6463-0.5075 0.5459-0.9094-1.103-4.417-5.0869-7.5697-9.7024-7.5697zm0.1947 3.5093 3.8013 3.8007c-0.1018-2.0569-1.7488-3.7024-3.8013-3.8007z</StreamGeometry>

  <MenuFlyout x:Key="SimpleTextBoxContextFlyout" Placement="Bottom">
    <MenuItem x:Name="TextBoxContextFlyoutCutItem" Header="Cut" Command="{Binding $parent[TextBox].Cut}"
              IsEnabled="{Binding $parent[TextBox].CanCut}" InputGesture="{x:Static TextBox.CutGesture}" />
    <MenuItem x:Name="TextBoxContextFlyoutCopyItem" Header="Copy" Command="{Binding $parent[TextBox].Copy}"
              IsEnabled="{Binding $parent[TextBox].CanCopy}" InputGesture="{x:Static TextBox.CopyGesture}" />
    <MenuItem x:Name="TextBoxContextFlyoutPasteItem" Header="Paste" Command="{Binding $parent[TextBox].Paste}"
              IsEnabled="{Binding $parent[TextBox].CanPaste}" InputGesture="{x:Static TextBox.PasteGesture}" />
  </MenuFlyout>

  <ControlTheme x:Key="SimpleTextBoxClearButtonTheme"
                BasedOn="{StaticResource {x:Type Button}}"
                TargetType="Button">
    <Setter Property="Cursor" Value="Arrow" />
    <Setter Property="Template">
      <Setter.Value>
        <ControlTemplate TargetType="Button">
          <Border x:Name="PART_ButtonLayoutBorder"
                  Background="Transparent"
                  BorderThickness="{TemplateBinding BorderThickness}">
            <Path x:Name="PART_GlyphElement"
                  Width="10"
                  Height="10"
                  HorizontalAlignment="Center"
                  VerticalAlignment="Center"
                  Data="{StaticResource TextBoxClearButtonData}"
                  Fill="{DynamicResource ThemeForegroundColor}"
                  Stretch="Uniform" />
          </Border>
        </ControlTemplate>
      </Setter.Value>
    </Setter>
  </ControlTheme>

  <ControlTheme x:Key="SimplePasswordBoxRevealButtonTheme"
                BasedOn="{StaticResource {x:Type Button}}"
                TargetType="ToggleButton">
    <Setter Property="Cursor" Value="Arrow" />
    <Setter Property="Template">
      <Setter.Value>
        <ControlTemplate TargetType="ToggleButton">
          <Border x:Name="PART_ButtonLayoutBorder"
                  Width="12"
                  Background="Transparent">
            <Panel>
              <Path x:Name="PART_GlyphElement_Reveal"
                    Width="12"
                    Height="8"
                    HorizontalAlignment="Center"
                    VerticalAlignment="Center"
                    Data="{DynamicResource PasswordBoxRevealButtonData}"
                    Fill="{DynamicResource ThemeForegroundColor}"
                    Stretch="Uniform" />
              <Path x:Name="PART_GlyphElement_Hide"
                    Width="12"
                    Height="12"
                    HorizontalAlignment="Center"
                    VerticalAlignment="Center"
                    Data="{DynamicResource PasswordBoxHideButtonData}"
                    Fill="{DynamicResource ThemeForegroundColor}"
                    Stretch="Uniform" />
            </Panel>
          </Border>
        </ControlTemplate>
      </Setter.Value>
    </Setter>

    <Style Selector="^:unchecked /template/ Path#PART_GlyphElement_Hide">
      <Setter Property="IsVisible" Value="False" />
    </Style>
    <Style Selector="^:checked /template/ Path#PART_GlyphElement_Reveal">
      <Setter Property="IsVisible" Value="False" />
    </Style>
  </ControlTheme>

  <ControlTheme x:Key="{x:Type TextBox}"
                TargetType="TextBox">
    <Setter Property="CaretBrush" Value="{DynamicResource ThemeForegroundBrush}" />
    <Setter Property="Background" Value="{DynamicResource ThemeBackgroundBrush}" />
    <Setter Property="BorderBrush" Value="{DynamicResource ThemeBorderMidBrush}" />
    <Setter Property="Foreground" Value="{DynamicResource ThemeForegroundBrush}" />
    <Setter Property="BorderThickness" Value="{DynamicResource ThemeBorderThickness}" />
    <Setter Property="SelectionBrush" Value="{DynamicResource HighlightBrush}" />
    <Setter Property="SelectionForegroundBrush" Value="{DynamicResource HighlightForegroundBrush}" />
    <Setter Property="Padding" Value="4" />
    <Setter Property="ContextFlyout" Value="{StaticResource SimpleTextBoxContextFlyout}" />
    <Setter Property="ScrollViewer.IsScrollChainingEnabled" Value="True" />
    <Setter Property="Template">
      <ControlTemplate>
        <Border Name="border"
                Background="{TemplateBinding Background}"
                BorderBrush="{TemplateBinding BorderBrush}"
                BorderThickness="{TemplateBinding BorderThickness}"
                CornerRadius="{TemplateBinding CornerRadius}">
          <DockPanel Margin="{TemplateBinding Padding}"
                     HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                     VerticalAlignment="{TemplateBinding VerticalContentAlignment}">

            <TextBlock Name="floatingWatermark"
                       DockPanel.Dock="Top"
                       FontSize="{DynamicResource FontSizeSmall}"
                       Foreground="{DynamicResource ThemeAccentBrush}"
                       Text="{TemplateBinding Watermark}">
              <TextBlock.IsVisible>
                <MultiBinding Converter="{x:Static BoolConverters.And}">
                  <Binding Path="UseFloatingWatermark"
                           RelativeSource="{RelativeSource TemplatedParent}" />
                  <Binding Converter="{x:Static StringConverters.IsNotNullOrEmpty}"
                           Path="Text"
                           RelativeSource="{RelativeSource TemplatedParent}" />
                </MultiBinding>
              </TextBlock.IsVisible>
            </TextBlock>

            <DataValidationErrors>

              <Grid ColumnDefinitions="Auto,*,Auto">
                <ContentPresenter Grid.Column="0"
                                  Grid.ColumnSpan="1"
                                  Content="{TemplateBinding InnerLeftContent}" />
                <ScrollViewer Grid.Column="1"
                              Grid.ColumnSpan="1"
                              AllowAutoHide="{TemplateBinding (ScrollViewer.AllowAutoHide)}"
                              HorizontalScrollBarVisibility="{TemplateBinding (ScrollViewer.HorizontalScrollBarVisibility)}"
                              IsScrollChainingEnabled="{TemplateBinding (ScrollViewer.IsScrollChainingEnabled)}"
                              VerticalScrollBarVisibility="{TemplateBinding (ScrollViewer.VerticalScrollBarVisibility)}">
                  <Panel>
                    <TextBlock Name="watermark"
                               IsVisible="{TemplateBinding Text,
                                                           Converter={x:Static StringConverters.IsNullOrEmpty}}"
                               Opacity="0.5"
                               Text="{TemplateBinding Watermark}"
                               TextAlignment="{TemplateBinding TextAlignment}"
                               TextWrapping="{TemplateBinding TextWrapping}" />
                    <TextPresenter Name="PART_TextPresenter"
                                   CaretBrush="{TemplateBinding CaretBrush}"
                                   CaretIndex="{TemplateBinding CaretIndex}"
                                   LineHeight="{TemplateBinding LineHeight}"
                                   LetterSpacing="{TemplateBinding LetterSpacing}"
                                   PasswordChar="{TemplateBinding PasswordChar}"
                                   RevealPassword="{TemplateBinding RevealPassword}"
                                   SelectionBrush="{TemplateBinding SelectionBrush}"
                                   SelectionEnd="{TemplateBinding SelectionEnd}"
                                   SelectionForegroundBrush="{TemplateBinding SelectionForegroundBrush}"
                                   SelectionStart="{TemplateBinding SelectionStart}"
                                   Text="{TemplateBinding Text,Mode=TwoWay}"
                                   TextAlignment="{TemplateBinding TextAlignment}"
                                   TextWrapping="{TemplateBinding TextWrapping}" />
                  </Panel>
                </ScrollViewer>
                <ContentPresenter Grid.Column="2"
                                  Grid.ColumnSpan="1"
                                  Content="{TemplateBinding InnerRightContent}" />
              </Grid>
            </DataValidationErrors>
          </DockPanel>
        </Border>
      </ControlTemplate>
    </Setter>

    <Style Selector="^:pointerover /template/ Border#border">
      <Setter Property="BorderBrush" Value="{DynamicResource ThemeBorderHighBrush}" />
    </Style>
    <Style Selector="^:focus /template/ Border#border">
      <Setter Property="BorderBrush" Value="{DynamicResource ThemeBorderHighBrush}" />
    </Style>
    <Style Selector="^:error /template/ Border#border">
      <Setter Property="BorderBrush" Value="{DynamicResource ErrorBrush}" />
    </Style>
    <Style Selector="^ /template/ DockPanel">
      <Setter Property="Cursor" Value="IBeam" />
    </Style>
    <Style Selector="^:disabled /template/ Border#border">
      <Setter Property="Opacity" Value="{DynamicResource ThemeDisabledOpacity}" />
    </Style>

    <Style Selector="^.clearButton[AcceptsReturn=False][IsReadOnly=False]:focus:not(TextBox:empty)">
      <Setter Property="InnerRightContent">
        <Template>
          <Button Command="{Binding $parent[TextBox].Clear}"
                  Focusable="False"
                  Theme="{StaticResource SimpleTextBoxClearButtonTheme}" 
                  ClipToBounds="True" />
        </Template>
      </Setter>
    </Style>

    <Style Selector="^.revealPasswordButton[AcceptsReturn=False][IsReadOnly=False]:not(TextBox:empty)">
      <Setter Property="InnerRightContent">
        <Template>
          <Panel Margin="4,0">
            <Panel.Styles>
              <Style Selector="ToggleButton[IsChecked=True]">
                <Setter Property="(ToolTip.Tip)" Value="Hide Password" />
              </Style>
              <Style Selector="ToggleButton[IsChecked=False]">
                <Setter Property="(ToolTip.Tip)" Value="Show Password" />
              </Style>
            </Panel.Styles>
            <ToggleButton Background="Transparent"
                          Focusable="False"
                          IsChecked="{Binding $parent[TextBox].RevealPassword, Mode=TwoWay}"
                          Theme="{StaticResource SimplePasswordBoxRevealButtonTheme}"
                          ClipToBounds="True" />
          </Panel>
        </Template>
      </Setter>
    </Style>
  </ControlTheme>
</ResourceDictionary>