[.NET10] [Enhancement] Display Window Title in bold by default with configurable font attributes

[Tamilarasan-Paranthaman]

Note

Are you waiting for the changes in this PR to be merged?
It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

Description of Change

• Implemented a new TitleFontAttributes property on the TitleBar to control the font style of the window title.
  • Default value is Bold (to highlight the app title).
  • Users can customize it to Italic, Bold, or None as needed.

Public API Changes

• New Property Added: TitleFontAttributes (on TitleBar)
• Type: FontAttributes
• Default Value: Bold
• Description: Controls the font style of the window title. Supports Bold, Italic, and None.

Screenshot

Windows	Mac
Windows-TitleBar.mp4	Mac-TitleBar.mov

Usage Example

Xaml:

<Window.TitleBar>
    <TitleBar Title="My App"
              TitleFontAttributes="Italic" />
</Window.TitleBar>

C#:

public partial class App : Application
{
  protected override Window CreateWindow(IActivationState? activationState)
  {
     var window = new Window(new SandboxShell());
     window.TitleBar = new TitleBar
     {
      Title = "MauiApp",
      TitleFontAttributes = FontAttributes.Bold,
     };

   return window;
  }
}
 

Issues Fixed

Fixes #24627

[jsuarezruiz]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[Copilot]

Pull Request Overview

This PR adds a new TitleFontAttributes property to the TitleBar control that allows developers to customize the font style (Bold, Italic, None) of the window title text, with Bold as the default value to enhance app title visibility.

• Added TitleFontAttributes property to TitleBar with FontAttributes.Bold as default
• Updated TitleBar template to bind the new property to the title label
• Added comprehensive UI tests to verify the font attributes functionality

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

File	Description
src/Controls/src/Core/TitleBar/TitleBar.cs	Added TitleFontAttributes property with Bold default and binding to title label
src/Controls/tests/TestCases.HostApp/Issues/Issue24627.cs	Created test page to demonstrate title font attributes with toggle functionality
src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue24627.cs	Added UI tests to verify Bold default and None toggle behavior
src/Controls/src/Core/PublicAPI/**/PublicAPI.Unshipped.txt	Updated public API surface for all platforms to include new property

[jsuarezruiz]

Failing related tests:

[Tamilarasan-Paranthaman]

Failing related tests:

@jsuarezruiz, I have updated the test sample, and committed the images

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jsuarezruiz]

Why use bold by default? Using None maintain backward compatibility.

[Tamilarasan-Paranthaman]

Okay. I have changed the default value to FontAttributes.None to maintain backward compatibility.

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).