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Web source: off-screen WebView2 capture + layout persistence + transparent bg

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Bundle exception (2026-08-27): this lands prior-session work plus today's
transparency fix as one commit per creator instruction.

WebView2Manager (new): off-screen WebView2 control parked at -5000/-5000 in
the window's visual tree, captures via CapturePreviewAsync every 100 ms into
a BGRA8 VideoFrame. Source Width/Height sync to the control via
PropertyChanged. JS transparent-background injection runs on every
NavigationStarting/NavigationCompleted so the page's own CSS does not paint
white over the capture.

Transparency fix: DefaultBackgroundColor = System.Drawing.Color.Transparent
set on the WPF control before EnsureCoreWebView2Async. The WPF SDK doc says
the value is forwarded to the controller on init; the IDL (ICoreWebView2-
Controller2) confirms alpha=0 makes the capture alpha-preserving. The
prior-session 'CoreWebView2.BackgroundColor' path was the wrong property
name and has been replaced.

LayoutStore: WebUri column added (idempotent ALTER TABLE) and round-tripped
on save/load (schema v11).

MainViewModel: WebView2Manager constructed on Loaded; loaded web sources
re-registered; Source.WebUri PropertyChanged forwards to manager.

MainWindow: off-screen host Canvas added to visual tree.

Tests: 3 scale-sync + WebView2_DefaultBackgroundColor_Is_Transparent +
LayoutStorePersistenceTests.WebSource_WebUri_Persists. 234/236 pass
(2 pre-existing failures unchanged).

Scale bug (DPI/physical-pixel mismatch) still open.
This commit is contained in:
Llama Chile Shop
2026-08-27 08:52:39 -07:00
parent f81048849a
commit fd6e02b687
10 changed files with 595 additions and 57 deletions
Download Patch File Download Diff File Expand all files Collapse all files
MainWindow.xaml
+32 -4
View File
@@ -294,7 +294,7 @@
<MenuItem Header="Countdown" Command="{Binding AddSourceCommand}" CommandParameter="{x:Static models:SourceType.Countdown}"
Visibility="{Binding IsCountdownAvailable, Converter={StaticResource BoolToVis}}"
ToolTip="Timer overlay — Starting and BRB screens only"/>
<MenuItem Header="Web" Command="{Binding AddSourceCommand}" CommandParameter="{x:Static models:SourceType.WebSource}"
<MenuItem Header="Web Resource" Command="{Binding AddSourceCommand}" CommandParameter="{x:Static models:SourceType.WebSource}"
ToolTip="Embedded web page — set URI in Properties panel"/>
<MenuItem Header="YouTube Chat" Command="{Binding AddSourceCommand}" CommandParameter="{x:Static models:SourceType.ChatBox}"
IsEnabled="{Binding CanAddYouTubeChat}"
@@ -522,6 +522,27 @@
<!-- Web source config -->
<StackPanel Visibility="{Binding SelectedElement.IsWebSource, Converter={StaticResource BoolToVis}}" Margin="0,0,0,8">
<TextBlock Text="Geometry" Foreground="#a0a0b0" FontSize="11" FontWeight="SemiBold" Margin="0,0,0,4"/>
<DockPanel Margin="0,0,0,4">
<TextBlock DockPanel.Dock="Left" Text="X" Foreground="#a0a0b0" FontSize="11" VerticalAlignment="Center" Width="16"/>
<TextBox Text="{Binding SelectedElement.X, UpdateSourceTrigger=PropertyChanged, StringFormat=F0}"
Background="#0f3460" Foreground="#e0d0e0" BorderThickness="1"
BorderBrush="#2c3a5c" Padding="4,2" FontSize="12"/>
<TextBlock DockPanel.Dock="Left" Text=" Y" Foreground="#a0a0b0" FontSize="11" VerticalAlignment="Center" Width="20" Margin="8,0,0,0"/>
<TextBox Text="{Binding SelectedElement.Y, UpdateSourceTrigger=PropertyChanged, StringFormat=F0}"
Background="#0f3460" Foreground="#e0d0e0" BorderThickness="1"
BorderBrush="#2c3a5c" Padding="4,2" FontSize="12"/>
</DockPanel>
<DockPanel Margin="0,0,0,4">
<TextBlock DockPanel.Dock="Left" Text="W" Foreground="#a0a0b0" FontSize="11" VerticalAlignment="Center" Width="16"/>
<TextBox Text="{Binding SelectedElement.Width, UpdateSourceTrigger=PropertyChanged, StringFormat=F0}"
Background="#0f3460" Foreground="#e0d0e0" BorderThickness="1"
BorderBrush="#2c3a5c" Padding="4,2" FontSize="12"/>
<TextBlock DockPanel.Dock="Left" Text=" H" Foreground="#a0a0b0" FontSize="11" VerticalAlignment="Center" Width="20" Margin="8,0,0,0"/>
<TextBox Text="{Binding SelectedElement.Height, UpdateSourceTrigger=PropertyChanged, StringFormat=F0}"
Background="#0f3460" Foreground="#e0d0e0" BorderThickness="1"
BorderBrush="#2c3a5c" Padding="4,2" FontSize="12"/>
</DockPanel>
<TextBlock Text="URI" Foreground="#a0a0b0" FontSize="11" Margin="0,0,0,2"/>
<DockPanel>
<Button DockPanel.Dock="Right" Style="{StaticResource IconButton}"
@@ -831,9 +852,12 @@
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
<DataTrigger Binding="{Binding IsChatBox}" Value="True">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
<MultiDataTrigger>
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
<DataTrigger Binding="{Binding IsWebSource}" Value="True">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
<MultiDataTrigger>
<MultiDataTrigger.Conditions>
<Condition Binding="{Binding IsWebcam}" Value="True"/>
<Condition Binding="{Binding ClipShape}" Value="Traditional"/>
@@ -1644,6 +1668,10 @@
</Border>
</Grid>
<!-- ═══ WEB SOURCE HOST: hidden panel for WebView2 controls ═══ -->
<Canvas x:Name="WebViewHostPanel" Grid.RowSpan="4"
Opacity="0" IsHitTestVisible="False" Background="Transparent"/>
<!-- ═══ TOASTS: non-blocking notifications (bottom-right, above footer) ═══ -->
<notifications:NotificationArea x:Name="ToastArea"
Grid.RowSpan="4"