Semi.Avalonia/demo/Semi.Avalonia.Demo/Pages/ToolTipDemo.axaml

<UserControl
    x:Class="Semi.Avalonia.Demo.Pages.ToolTipDemo"
    xmlns="https://github.com/avaloniaui"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    d:DesignHeight="450"
    d:DesignWidth="800"
    mc:Ignorable="d">
    <StackPanel HorizontalAlignment="Left">
        <Border
            Margin="5"
            Padding="50,10"
            Classes="Hover"
            Theme="{StaticResource CardBorder}"
            ToolTip.Tip="This is a ToolTip">
            <TextBlock>Hover Here</TextBlock>
        </Border>
        <ToggleSwitch
            Margin="5"
            Content="ToolTip Open"
            IsChecked="{Binding ElementName=Border, Path=(ToolTip.IsOpen)}" />
        <Border
            Name="Border"
            Margin="5"
            Padding="50,10"
            Classes="Hover"
            Theme="{StaticResource CardBorder}"
            ToolTip.Placement="Bottom">
            <ToolTip.Tip>
                <StackPanel>
                    <TextBlock Classes="h1">ToolTip</TextBlock>
                    <TextBlock Classes="h2">A control which pops up a hint when a control is hovered</TextBlock>
                </StackPanel>
            </ToolTip.Tip>
            <TextBlock>ToolTip bottom placement</TextBlock>
        </Border>
        <Border
            Margin="5"
            Padding="50,10"
            Classes="Hover"
            Theme="{StaticResource CardBorder}"
            ToolTip.Placement="Top"
            ToolTip.Tip="Hello">
            <Border.Styles>
                <Style Selector="Border">
                    <Style.Animations>
                        <Animation IterationCount="Infinite" Duration="0:0:2">
                            <KeyFrame KeyTime="0:0:0">
                                <Setter Property="ToolTip.HorizontalOffset" Value="0" />
                                <Setter Property="ToolTip.VerticalOffset" Value="-50" />
                            </KeyFrame>
                            <KeyFrame KeyTime="0:0:2">
                                <Setter Property="ToolTip.HorizontalOffset" Value="100" />
                                <Setter Property="ToolTip.VerticalOffset" Value="50" />
                            </KeyFrame>
                        </Animation>
                    </Style.Animations>
                </Style>
            </Border.Styles>
            <TextBlock>Moving offset</TextBlock>
        </Border>
        <Border
            Margin="5"
            Padding="50,10"
            Classes="Hover"
            Theme="{StaticResource CardBorder}"
            ToolTip.Placement="Top"
            ToolTip.Tip="Hello">
            <TextBlock>Top</TextBlock>
        </Border>
        <Border
            Margin="5"
            Padding="50,10"
            Classes="Hover"
            Theme="{StaticResource CardBorder}"
            ToolTip.Placement="Left"
            ToolTip.Tip="Hello">
            <TextBlock>Left</TextBlock>
        </Border>
        <Border
            Margin="5"
            Padding="50,10"
            Classes="Hover"
            Theme="{StaticResource CardBorder}"
            ToolTip.Placement="Right"
            ToolTip.Tip="Hello">
            <TextBlock>Right</TextBlock>
        </Border>
        <Border
            Margin="5"
            Padding="50,10"
            Classes="Hover"
            Theme="{StaticResource CardBorder}"
            ToolTip.Placement="Bottom"
            ToolTip.Tip="Hello">
            <TextBlock>Bottom</TextBlock>
        </Border>
    </StackPanel>
</UserControl>