dotnet/winforms

[Dark Mode] Different Icon Display for Expanding Nodes with Child Items in TreeView

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#11,932 opened on Aug 20, 2024

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area-DarkModehelp wanted

Description

.NET version

9.0.0-rc.1.24414.1 + build private dll from winforms repo main branch

Did it work in .NET Framework?

No

Did it work in any of the earlier releases of .NET Core or .NET 5+?

This is a new feature Dark Mode: https://github.com/dotnet/winforms/pull/11857

Issue description

The icon for expanding nodes with child items in TreeView appears differently in Dark Mode compared to Classic. Please confirm if this is the expected behavior. Below are the results in Classic and Dark Mode

Classic Screenshot 2024-08-20 055045

Dark Mode Screenshot 2024-08-20 054838

Steps to reproduce

  1. Create a WinForms .NET Core application with TreeView control.
  2. Populate the TreeView with a parent node that contains several child nodes.
  3. Enable DarkMode by Application.SetColorMode(SystemColorMode.Dark) in Program.cs file.
  4. Run the application.
  5. Observe the expand icon

Contributor guide

Tech stack
csharp
Domain
desktop
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C#WinForms basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate the TreeView expand icon rendering in dark mode. Compare the Classic and Dark Mode glyph drawing logic. The relevant code is likely in the TreeView control's painting methods. Check the recent dark mode changes in PR #11857.