Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #4329

Type of change

Please select the option that is relevant.

[ ] Bug fix (non-breaking change which fixes an issue)
[x] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration using wails doctor.

[ ] Windows
[x] macOS
[ ] Linux

If you checked Linux, please specify the distro and version.

Test Configuration

Please paste the output of wails doctor. If you are unable to run this command, please describe your environment in as much detail as possible.

etesam@etesams-MacBook-Air ~/C/w/wails (getAccentColor)> wails3 doctor
 Wails (v3.0.0-dev)  Wails Doctor 
                                                                                                                                    
# System 

┌──────────────────────────────────────────────────┐
| Name          | MacOS                            |
| Version       | 15.5                             |
| ID            | 24F74                            |
| Branding      | Sequoia                          |
| Platform      | darwin                           |
| Architecture  | arm64                            |
| Apple Silicon | true                             |
| CPU           | Apple M2                         |
| CPU 1         | Apple M2                         |
| CPU 2         | Apple M2                         |
| GPU           | 10 cores, Metal Support: Metal 3 |
| Memory        | 24 GB                            |
└──────────────────────────────────────────────────┘

# Build Environment 

┌─────────────────────────────────────────────────────────┐
| Wails CLI    | v3.0.0-dev                               |
| Go Version   | go1.24.3                                 |
| Revision     | 83005be066de63f70141cdc7443f7885c34bb300 |
| Modified     | false                                    |
| -buildmode   | exe                                      |
| -compiler    | gc                                       |
| CGO_CFLAGS   |                                          |
| CGO_CPPFLAGS |                                          |
| CGO_CXXFLAGS |                                          |
| CGO_ENABLED  | 1                                        |
| CGO_LDFLAGS  |                                          |
| GOARCH       | arm64                                    |
| GOARM64      | v8.0                                     |
| GOOS         | darwin                                   |
| vcs          | git                                      |
| vcs.modified | false                                    |
| vcs.revision | 83005be066de63f70141cdc7443f7885c34bb300 |
| vcs.time     | 2025-05-26T11:03:37Z                     |
└─────────────────────────────────────────────────────────┘

# Dependencies 

┌────────────────────────────────────────────────────────────────────────┐
| Xcode cli tools | 2409                                                 |
| npm             | 10.9.2                                               |
| *NSIS           | Not Installed. Install with `brew install makensis`. |
|                                                                        |
└─────────────────────── * - Optional Dependency ────────────────────────┘

# Checking for issues 

 SUCCESS  No issues found

# Diagnosis 

 SUCCESS  Your system is ready for Wails development!

Need documentation? Run: wails3 docs
 ♥   If Wails is useful to you or your company, please consider sponsoring the project: wails3 sponsor

Checklist:

[x] I have updated website/src/pages/changelog.mdx with details of this PR
[x] My code follows the general coding style of this project
[x] I have performed a self-review of my own code
[x] I have commented my code, particularly in hard-to-understand areas
[ ] I have made corresponding changes to the documentation
[ ] My changes generate no new warnings
[ ] I have added tests that prove my fix is effective or that my feature works
[ ] New and existing unit tests pass locally with my changes

Summary by CodeRabbit

New Features
- Introduced the ability to retrieve the system accent color on macOS. This feature provides the accent color as an RGB string for supported systems.

May 31 '25 17:05 Etesam913

[!IMPORTANT]

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"""

Walkthrough

A new feature was introduced to retrieve the system accent color on macOS. This includes adding a GetAccentColor() method to the application API, platform-specific implementation for macOS using Objective-C, and documentation of the change in the changelog. No other logic or control flow was modified.

Changes

File(s)	Change Summary
docs/src/content/docs/changelog.mdx	Added changelog entry for new `app.GetAccentColor()` feature in v3.0.0-alpha.9.
v3/pkg/application/application.go	Added `GetAccentColor()` to `App` struct; updated interface; default/fallback value logic added.
v3/pkg/application/application_darwin.go	Implemented macOS-specific accent color retrieval in C/Objective-C; added `getAccentColor()` method.
v3/pkg/application/application_linux.go, application_windows.go	Added `getAccentColor()` methods returning default color strings for Linux and Windows platforms.

Sequence Diagram(s)

sequenceDiagram
    participant App
    participant platformApp (macosApp)
    participant macOS System

    App->>platformApp (macosApp): GetAccentColor()
    alt platformApp is nil
        App->>App: return "rgb(0,122,255)"
    else platformApp is macosApp
        platformApp (macosApp)->>macOS System: getAccentColor()
        macOS System-->>platformApp (macosApp): "rgb(r,g,b)"
        platformApp (macosApp)-->>App: "rgb(r,g,b)"
    end

Assessment against linked issues

Objective	Addressed	Explanation
Add a `getAccentColor` method to retrieve the macOS system accent color (#4329)	✅

Assessment against linked issues: Out-of-scope changes

No out-of-scope changes found.

Poem

A hop and a skip, a color so bright,
Now apps can match your Mac just right!
With GetAccentColor() in the code,
The user's style is now bestowed.
Rabbits cheer, the theme's in sync—
Blue, green, or pink, what do you think?
🐇🌈 """

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May 31 '25 17:05 coderabbitai[bot]

I'm not sure where any tests for this feature would be added in the project?

May 31 '25 17:05 Etesam913

Thanks for opening this. Do you think it might be better to use something like app.Mac.GetAccentColour? Also https://github.com/wailsapp/wails/actions/runs/15365920957/job/43238816949?pr=4330 shows that as there is no implementation (even a nop one) on Linux, the build fails. Same will be true for Windows.