Files
Ursa.Avalonia/demo/Ursa.Demo/Pages/ImageViewerDemo.axaml

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XML

<UserControl
x:Class="Ursa.Demo.Pages.ImageViewerDemo"
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"
xmlns:u="https://irihi.tech/ursa"
d:DesignHeight="450"
d:DesignWidth="800"
mc:Ignorable="d">
<UserControl.Resources>
<SolidColorBrush x:Key="MaskBackground" Opacity="0.2" Color="Red" />
<SolidColorBrush x:Key="MaskBorder" Color="Red" />
</UserControl.Resources>
<StackPanel>
<u:Banner
Content="Setting the Scale before loading has no effect."
Header="Notice"
Type="Warning" />
<u:ImageViewer
Name="viewer"
Width="600"
Height="300"
MinScale="0.5"
Source="../Assets/3x.png">
<u:ImageViewer.Overlayer>
<Grid
HorizontalAlignment="Stretch"
ColumnDefinitions="*, Auto, *"
IsVisible="{Binding #maskSwitch.IsChecked}">
<Border
Grid.Column="0"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Background="{StaticResource MaskBackground}"
BorderBrush="{StaticResource MaskBorder}"
BorderThickness="0,0,1,0"
IsHitTestVisible="False" />
<Rectangle
Grid.Column="1"
Width="150"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Fill="Transparent"
IsHitTestVisible="False" />
<Border
Grid.Column="2"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Background="{StaticResource MaskBackground}"
BorderBrush="{StaticResource MaskBorder}"
BorderThickness="1,0,0,0"
IsHitTestVisible="False" />
</Grid>
</u:ImageViewer.Overlayer>
</u:ImageViewer>
<Grid ColumnDefinitions="Auto, Auto, *" RowDefinitions="Auto, Auto, Auto, Auto">
<TextBlock
Grid.Row="0"
Grid.Column="0"
Text="Scale" />
<Slider
Grid.Row="0"
Grid.Column="1"
Width="200"
Maximum="10"
Minimum="0.1"
Value="{Binding #viewer.Scale}" />
<TextBlock
Grid.Row="0"
Grid.Column="2"
Text="{Binding #viewer.Scale, StringFormat=\{0:0.00000\}}" />
<TextBlock
Grid.Row="1"
Grid.Column="0"
Text="TranslateX" />
<Slider
Grid.Row="1"
Grid.Column="1"
Width="200"
IsSnapToTickEnabled="True"
Maximum="300"
Minimum="-300"
TickFrequency="0.1"
Value="{Binding #viewer.TranslateX}" />
<TextBlock
Grid.Row="1"
Grid.Column="2"
Text="{Binding #viewer.TranslateX, StringFormat=\{0:0.0\}}" />
<TextBlock
Grid.Row="2"
Grid.Column="0"
Text="TranslateY" />
<Slider
Grid.Row="2"
Grid.Column="1"
Width="200"
IsSnapToTickEnabled="True"
Maximum="300"
Minimum="-300"
TickFrequency="0.1"
Value="{Binding #viewer.TranslateY}" />
<TextBlock
Grid.Row="2"
Grid.Column="2"
Text="{Binding #viewer.TranslateY, StringFormat=\{0:0.0\}}" />
<TextBlock
Grid.Row="3"
Grid.Column="0"
Text="Show Mask" />
<ToggleSwitch
Name="maskSwitch"
Grid.Row="3"
Grid.Column="1"
Theme="{DynamicResource SimpleToggleSwitch}" />
</Grid>
</StackPanel>
</UserControl>