Add windowing samples for ExtendsContentIntoTitleBar, SetBorderAndTitleBar, and InputNonClientPointerSource APIs

[Copilot]

Adds three new samples demonstrating advanced windowing APIs for custom title bar scenarios.

New Samples

ExtendContentIntoTitleBarWindow

• Demonstrates Window.ExtendsContentIntoTitleBar to extend UI into title bar while preserving system caption buttons
• Uses SetTitleBar() to define drag region

ExtendsContentIntoTitleBar = true;
SetTitleBar(CustomTitleBar);

CustomTitleBarWindow

• Demonstrates SetBorderAndTitleBar(true, false) to hide system caption buttons
• Custom minimize/maximize/close buttons with full window control
• Uses InputNonClientPointerSource.SetRegionRects with NonClientRegionKind.Passthrough on maximize button to enable Windows 11 Snap Layouts

_appWindow.SetBorderAndTitleBar(hasBorder: true, hasTitleBar: false);
_nonClientPointerSource.SetRegionRects(NonClientRegionKind.Passthrough, new[] { rect });

DraggableRegionWindow

• Demonstrates InputNonClientPointerSource.SetRegionRects with NonClientRegionKind.Caption to create custom drag regions anywhere in window content
• Dynamically updates region on resize/layout changes

_nonClientPointerSource.SetRegionRects(NonClientRegionKind.Caption, new[] { rect });

Changes

• Added 3 new window samples with XAML and code-behind
• Updated MainPage with buttons to launch new samples
• Updated README with sample descriptions

All implementations include platform-specific error handling and follow existing sample patterns.

Warning

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  • Triggering command: dotnet restore --no-dependencies /home/REDACTED/work/Uno.Samples/Uno.Samples/UI/HtmlControls/HtmlControls.sln --packages /home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:EnableWindowsTargeting=true (dns block)
• pdfvsblobprodcus380.blob.core.windows.net
  • Triggering command: dotnet restore --no-dependencies /home/REDACTED/work/Uno.Samples/Uno.Samples/UI/WebRTC/WebRTC.sln --packages /home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:EnableWindowsTargeting=true (dns block)
  • Triggering command: dotnet restore --no-dependencies /home/REDACTED/work/Uno.Samples/Uno.Samples/UI/HtmlControls/HtmlControls.sln --packages /home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:EnableWindowsTargeting=true (dns block)
  • Triggering command: dotnet restore --no-dependencies /home/REDACTED/work/Uno.Samples/Uno.Samples/UI/UnoIslandsSampleApp/UnoIslandsSampleApp.sln --packages /home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:EnableWindowsTargeting=true (dns block)
• rcxvsblobprodcus328.blob.core.windows.net
  • Triggering command: dotnet restore --no-dependencies /home/REDACTED/work/Uno.Samples/Uno.Samples/UI/NativeElementHostingDesktop/NativeElementHostingDesktop.sln --packages /home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:EnableWindowsTargeting=true (dns block)
• se1vsblobprodcus349.blob.core.windows.net
  • Triggering command: dotnet restore --no-dependencies /home/REDACTED/work/Uno.Samples/Uno.Samples/UI/WebRTC/WebRTC.sln --packages /home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:EnableWindowsTargeting=true (dns block)
  • Triggering command: dotnet restore --no-dependencies /home/REDACTED/work/Uno.Samples/Uno.Samples/UI/HtmlControls/HtmlControls.sln --packages /home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:EnableWindowsTargeting=true (dns block)
• sqdvsblobprodcus333.blob.core.windows.net
  • Triggering command: dotnet restore --no-dependencies /home/REDACTED/work/Uno.Samples/Uno.Samples/UI/NativeElementHostingDesktop/NativeElementHostingDesktop.sln --packages /home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:EnableWindowsTargeting=true (dns block)
• u3hvsblobprodcus371.blob.core.windows.net
  • Triggering command: dotnet restore --no-dependencies /home/REDACTED/work/Uno.Samples/Uno.Samples/UI/UnoIslandsSampleApp/UnoIslandsSampleApp.sln --packages /home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:EnableWindowsTargeting=true (dns block)
• www.myget.org
  • Triggering command: /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/csharp/tools/linux64/Semmle.Autobuild.CSharp (dns block)
  • Triggering command: dotnet restore --no-dependencies /home/REDACTED/work/Uno.Samples/Uno.Samples/UI/UnoContoso/UnoContoso.sln --packages /home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:EnableWindowsTargeting=true (dns block)
• ytvvsblobprodcus310.blob.core.windows.net
  • Triggering command: dotnet restore --no-dependencies /home/REDACTED/work/Uno.Samples/Uno.Samples/UI/WebRTC/WebRTC.sln --packages /home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:EnableWindowsTargeting=true (dns block)
  • Triggering command: dotnet restore --no-dependencies /home/REDACTED/work/Uno.Samples/Uno.Samples/UI/HtmlControls/HtmlControls.sln --packages /home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:EnableWindowsTargeting=true (dns block)
  • Triggering command: dotnet restore --no-dependencies /home/REDACTED/work/Uno.Samples/Uno.Samples/UI/NativeElementHostingDesktop/NativeElementHostingDesktop.sln --packages /home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/Uno.Samples/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:EnableWindowsTargeting=true (dns block)

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Improve Windowing sample with new features</issue_title>
<issue_description>### What would you like to be added? 💡

Add new sample pages to the Windowing sample:

• Illustrating Window.ExtendsContentIntoTitleBar API to allow extending XAML UI the titlebar area while preserving the caption buttons
• Illustrating the SetBorderAndTitleBar API with (true, false) to completely extend the client area and hide the caption buttons (allowing the user to render their own custom buttons - including InputNonClientPointerSource.SetRegionRects for Maximize button to support Snap layouts menu)
• Illustrating the usage of InputNonClientPointerSource.SetRegionRects for Caption (the sample could display a red rectangle in the middle of the window that would allow dragging the whole window)

Why is this needed? 🤔

No response

Renderer 🎨

• Skia
• Native

For which platforms 📱💻🖥️

No response

Anything else we need to know? 💬

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Improve Windowing sample with new features #902

---

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