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feat: adds new snippet region tag for Desktop Windowing#834

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prateekbatra-g wants to merge 2 commits intomainfrom
prateek/adaptive_desktop_windowing
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feat: adds new snippet region tag for Desktop Windowing#834
prateekbatra-g wants to merge 2 commits intomainfrom
prateek/adaptive_desktop_windowing

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feat: adds new snippet region tag for Desktop Windowing

@prateekbatra-g prateekbatra-g self-assigned this Mar 12, 2026
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snippet-bot bot commented Mar 12, 2026

Here is the summary of changes.

You are about to add 1 region tag.

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Summary of Changes

Hello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new code snippet to showcase the implementation of a custom caption bar within the context of Compose Desktop Windowing. The primary goal is to provide a clear, self-contained example for developers looking to customize window decorations, specifically the title bar, in their Compose desktop applications. This enhances the available documentation and examples for adaptive layouts.

Highlights

  • New Snippet Region Tag: A new snippet region tag, android_compose_desktop_window_insets_title, has been added to demonstrate how to implement a custom caption bar for desktop windowing in Compose.
  • Desktop Windowing Example: The added snippet provides a CaptionBar Composable function that checks for WindowInsets.isCaptionBarVisible and displays a centered text with a dynamic background color based on the system's dark theme setting.

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Changelog
  • compose/snippets/src/main/java/com/example/compose/snippets/adaptivelayouts/DesktopWindowing.kt
    • Added a new file containing the CaptionBar Composable function.
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Code Review

This pull request adds a new code snippet for creating a custom caption bar in a desktop Compose application. The implementation has a critical issue where the background colors for light and dark themes are inverted, leading to unreadable text due to poor contrast. I've provided a suggestion to fix this and also recommended using theme-based colors for better maintainability and consistency with Material Design, instead of hardcoded colors.

Comment on lines +32 to +34
if (isSystemInDarkTheme())
Color.White
else Color.Black
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critical

The background color logic for dark and light themes is inverted, which will cause the text to be unreadable due to poor contrast. In dark mode, this sets a white background while the text color from the theme is likely light, making it illegible. A similar issue occurs in light theme with a black background and dark text.

While swapping Color.White and Color.Black would fix the immediate issue, a better long-term solution is to use colors from your MaterialTheme. Since you're already using MaterialTheme.typography, using theme colors for the background will make your component more robust and adaptable.

Here's a suggestion that fixes the inversion. For a more robust solution, consider refactoring to use theme colors like MaterialTheme.colorScheme.surfaceVariant for the background and onSurfaceVariant for the text.

Suggested change
if (isSystemInDarkTheme())
Color.White
else Color.Black
if (isSystemInDarkTheme())
Color.Black
else Color.White

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