Add Gradient tool control bar buttons, Reverse Stops and Reverse Direction

[Keavon]

capture_49_.mp4

[gemini-code-assist]

Summary of Changes

Hello @Keavon, 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 significantly enhances the Gradient tool by introducing new user interface controls for reversing gradient stops and direction. These additions provide more intuitive and direct manipulation of gradients, improving the overall user experience when working with fills. The changes include both the backend logic for these operations and the frontend integration into the tool's options bar, ensuring the UI dynamically reflects the current selection state.

Highlights

• New Gradient Controls: Added 'Reverse Stops' and 'Reverse Direction' buttons to the Gradient tool's control bar, allowing users to easily manipulate gradient appearance.
• Gradient Reversal Logic: Implemented core logic to reverse the order of color stops within a gradient and to swap the start and end points of a gradient, affecting its direction.
• Dynamic UI State: Introduced a mechanism to track if a selected layer has a gradient, enabling or disabling the new gradient control buttons accordingly to provide clear user feedback.

Changelog

• editor/src/messages/tool/tool_messages/gradient_tool.rs
  • Added ReverseStops and ReverseDirection variants to the GradientOptionsUpdate enum.
  • Implemented process_message logic to handle ReverseStops by reversing gradient color stops for selected layers.
  • Implemented process_message logic to handle ReverseDirection by swapping gradient start and end points for selected layers.
  • Introduced has_selected_gradient field to GradientToolData to track gradient presence on selected layers.
  • Added UI buttons for 'Reverse Stops' and 'Reverse Direction' to the Gradient tool's layout, with dynamic enabled/disabled states.
  • Added a new helper function has_gradient_on_selected_layers to determine if any selected layer contains a gradient.
  • Updated existing message processing to refresh tool options based on gradient selection changes.

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[gemini-code-assist]

Code Review

This pull request adds 'Reverse Stops' and 'Reverse Direction' functionality to the Gradient tool, including control bar buttons. The implementation is mostly solid, and a specific suggestion has been provided to refactor duplicated code in the message handler for these new options, which will improve the code's maintainability.