add Avalonia Dialogs

Pilz.UI.AvaloniaUI/Dialogs/AvaloniaFlyoutBase.axaml

@@ -0,0 +1,78 @@
+<UserControl 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:controls="https://git.pilzinsel64.de/pilz-framework/pilz"
+             xmlns:dialogs="clr-namespace:Pilz.UI.AvaloniaUI.Dialogs"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="Pilz.UI.AvaloniaUI.Dialogs.AvaloniaFlyoutBase">
+    
+    <StackPanel Orientation="Vertical">
+        
+        <!-- StackPanel: Header -->
+        <StackPanel
+            x:Name="StackPanelHeader"
+            Orientation="Horizontal"
+            HorizontalAlignment="Stretch"
+            Margin="3"
+            IsVisible="False"
+        >
+            
+            <Image
+                x:Name="ImageTitle"
+                HorizontalAlignment="Left"
+                VerticalAlignment="Center"
+            />
+            
+            <TextBlock
+                HorizontalAlignment="Left"
+                VerticalAlignment="Center"
+                x:Name="LabelTitle"
+            />
+        </StackPanel>
+        
+        <!-- Panel: Content -->
+        <ContentPresenter
+            HorizontalAlignment="Stretch"
+            VerticalAlignment="Stretch"
+            Margin="3"
+            Content="{Binding MainContent, RelativeSource={RelativeSource AncestorType=dialogs:AvaloniaFlyoutBase}}"
+        />
+        
+        <!-- StackPanel: Footer -->
+        <Grid
+            x:Name="StackPanelFooter"
+            RowDefinitions="Auto"
+            ColumnDefinitions="*,Auto,Auto"
+            HorizontalAlignment="Stretch"
+        >
+            <ContentPresenter
+                Grid.Column="0"
+                HorizontalAlignment="Stretch"
+                VerticalAlignment="Stretch"
+                Margin="3"
+                Content="{Binding FooterContent, RelativeSource={RelativeSource AncestorType=dialogs:AvaloniaFlyoutBase}}"
+            />
+            
+            <!-- Button: Okay -->
+            <controls:ImageButton
+                Grid.Column="1"
+                x:Name="ButtonOkay"
+                HorizontalAlignment="Right"
+                Margin="3"
+                Text="Okay"
+                Click="ButtonOkay_OnClick"
+            />
+            
+            <!-- Button: Cancel -->
+            <controls:ImageButton
+                Grid.Column="2"
+                x:Name="ButtonCancel"
+                HorizontalAlignment="Right"
+                Margin="3"
+                Text="Cancel"
+                Click="ButtonCancel_OnClick"
+            />
+        </Grid>
+    </StackPanel>
+</UserControl>