JetBrains/Avalonia
Nov 2024 – Sep 2025
6 Months active
Languages Used
C#XAML
Technical Skills
Layout ManagementUI DevelopmentUnit TestingCross-Platform DevelopmentMemory ManagementNative Development
Dan Walmsley
PROFILE
Dan Walmsley
Over six months, contributed to JetBrains/Avalonia by building new UI features and addressing core stability issues in C# and XAML. Delivered SplitView pane positioning for top and bottom layouts, updating control templates and ViewModels to support flexible orientations and themes. Tackled complex bugs such as viewport event signaling and macOS memory leaks, refactoring layout and native window management for reliability. Enhanced performance by optimizing inherited property change notifications and validating improvements with benchmarking. Emphasized cross-platform consistency, robust unit testing, and memory management throughout. The work demonstrates depth in UI framework development, control templating, and performance optimization across desktop environments.
Overall Statistics
Feature vs Bugs
33%Features
Repository Contributions
6Total
Bugs
4
Commits
6
Features
2
Lines of code
865
Activity Months6
Your Network
61 peopleWork History
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025 performance wrap-up for JetBrains/Avalonia: Delivered the SplitView Pane Positioning feature (Top/Bottom) with updated XAML and ViewModel support and refined control template and styling to render and animate correctly across orientations, display modes, and themes. This work enhances UI customization, consistency across themes, and lays groundwork for broader layout flexibility across the project.
1 Commits • 1 Features
Sep 1, 2025September 2025 performance wrap-up for JetBrains/Avalonia: Delivered the SplitView Pane Positioning feature (Top/Bottom) with updated XAML and ViewModel support and refined control template and styling to render and animate correctly across orientations, display modes, and themes. This work enhances UI customization, consistency across themes, and lays groundwork for broader layout flexibility across the project.
September 2025
August 2025
1 Commits
Aug 1, 2025August 2025: Focused on UI stability in JetBrains/Avalonia. Delivered a targeted bug fix for SplitView when switching DisplayMode to inline, added unit tests, and tightened disposal of input subscriptions to prevent leaks. The work reduces UI regressions and improves user experience when toggling display modes.
August 2025
1 Commits
Aug 1, 2025August 2025: Focused on UI stability in JetBrains/Avalonia. Delivered a targeted bug fix for SplitView when switching DisplayMode to inline, added unit tests, and tightened disposal of input subscriptions to prevent leaks. The work reduces UI regressions and improves user experience when toggling display modes.
March 2025
1 Commits • 1 Features
Mar 1, 2025March 2025 (2025-03) focused on delivering a targeted performance optimization for Avalonia's inherited property change notifications, with benchmarking to validate improvements. No high-severity bugs fixed this period; changes are isolated to the notification pathway and its benchmarks, contributing to improved runtime responsiveness in UI scenarios with inherited values.
1 Commits • 1 Features
Mar 1, 2025March 2025 (2025-03) focused on delivering a targeted performance optimization for Avalonia's inherited property change notifications, with benchmarking to validate improvements. No high-severity bugs fixed this period; changes are isolated to the notification pathway and its benchmarks, contributing to improved runtime responsiveness in UI scenarios with inherited values.
March 2025
January 2025
1 Commits
Jan 1, 2025January 2025 monthly summary for JetBrains/Avalonia. Delivered a macOS rendering stability fix by caching the initial render scaling value during initialization to prevent fluctuations caused by the native scaling property. This stabilizes UI rendering on macOS, improves cross-platform consistency, and reduces support overhead.
January 2025
1 Commits
Jan 1, 2025January 2025 monthly summary for JetBrains/Avalonia. Delivered a macOS rendering stability fix by caching the initial render scaling value during initialization to prevent fluctuations caused by the native scaling property. This stabilizes UI rendering on macOS, improves cross-platform consistency, and reduces support overhead.
December 2024
1 Commits
Dec 1, 2024December 2024 monthly summary for JetBrains/Avalonia focused on stability improvements and a critical memory leak fix in the macOS native window subsystem.
1 Commits
Dec 1, 2024December 2024 monthly summary for JetBrains/Avalonia focused on stability improvements and a critical memory leak fix in the macOS native window subsystem.
December 2024
November 2024
1 Commits
Nov 1, 2024In November 2024, focus was placed on stabilizing the UI layout event signaling in JetBrains/Avalonia. Delivered a critical bug fix to ensure EffectiveViewPortChanged is emitted after layout passes when a control with an existing valid layout is added to the visual tree, preventing missed viewport updates and inconsistent UI behavior. Updated the LayoutManager event logic to guarantee consistent viewport-change signaling, aligning with UWP standards. Expanded test coverage with unit tests validating the new behavior against UWP expectations to prevent regressions. These changes improve layout reliability, reduce debugging time for viewport-related issues, and increase developer trust in the framework’s UI signaling.
November 2024
1 Commits
Nov 1, 2024In November 2024, focus was placed on stabilizing the UI layout event signaling in JetBrains/Avalonia. Delivered a critical bug fix to ensure EffectiveViewPortChanged is emitted after layout passes when a control with an existing valid layout is added to the visual tree, preventing missed viewport updates and inconsistent UI behavior. Updated the LayoutManager event logic to guarantee consistent viewport-change signaling, aligning with UWP standards. Expanded test coverage with unit tests validating the new behavior against UWP expectations to prevent regressions. These changes improve layout reliability, reduce debugging time for viewport-related issues, and increase developer trust in the framework’s UI signaling.
Activity
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Quality Metrics
Correctness91.6%
Maintainability86.6%
Architecture86.6%
Performance86.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
C#XAML
Technical Skills
BenchmarkingC#Code RefactoringControl DevelopmentControl TemplatingCross-Platform DevelopmentDesktop DevelopmentEvent HandlingLayout ManagementMVVMMemory ManagementNative DevelopmentPerformance OptimizationUI DevelopmentUI Frameworks
Repositories Contributed To
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