Support configurable window dragging region for macOS examples with perfect mouse-window alignment

[Copilot]

This PR implements native window dragging functionality for macOS users in the JSAR runtime examples with a configurable drag region height and perfect 1:1 mouse-window movement alignment.

Key Features

Configurable Drag Region: The drag region height can be customized via the dragRegionHeight member variable (default: 25px) or the setDragRegionHeight(int height) method, allowing users to adjust the drag area to their preferences.

Perfect Mouse-Window Alignment: Ensures exact 1:1 mapping between mouse movement and window movement using a fixed offset calculation. The window maintains a consistent offset from the mouse cursor throughout the entire drag operation, eliminating any drift or misalignment that could occur with delta-based approaches.

Seamless Dragging Experience: Window dragging continues smoothly even when the cursor moves outside the window boundaries during fast movements, ensuring uninterrupted dragging until mouse button release.

Runtime Configuration: Users can modify the drag region height at runtime to suit different UI layouts or personal preferences.

Non-Interfering: All existing UI interactions work normally outside the drag region, ensuring backward compatibility.

Platform-Specific: Implementation is macOS-only using #ifdef __APPLE__ guards, with no impact on other platforms.

Implementation Details

Perfect Alignment Engine:

• Fixed offset calculation that maintains constant mouse-to-window relationship
• Eliminates drift and ensures precise 1:1 movement mapping
• Immediate response with no delay between cursor and window movement
• Consistent positioning regardless of dragging speed or duration

Configurable WindowContext Integration:

• Added dragRegionHeight member variable to WindowContext class (default: 25px)
• Added setDragRegionHeight(int height) public method for runtime configuration
• Enhanced mouse event handlers for responsive dragging behavior
• Proper initialization in both constructors

macOS Window Functions (macos_window.mm):

• startWindowDragging() - Calculates and stores the fixed mouse-to-window offset
• updateWindowDragging() - Positions window using current mouse location plus fixed offset
• stopWindowDragging() - Cleanly ends the dragging operation
• isMouseInDragRegion() - Detects if mouse is within the configurable drag area

Usage Example

WindowContext ctx(800, 600);
ctx.setDragRegionHeight(60); // Set custom 60px drag region
// Or access directly: ctx.dragRegionHeight = 30;

Technical Improvements

• Perfect Mouse Tracking: Fixed offset approach ensures mouse and window move exactly the same distance
• Continuous Dragging: Maintains dragging state even when cursor moves outside window bounds
• Zero Drift: Eliminates accumulation errors that can occur with delta-based movement
• Immediate Response: Direct positioning provides instant feedback without lag

Fixes #179.

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[yorkie]

The range needs to be configurable

[Copilot]

Made the drag region height configurable. Added dragRegionHeight member variable (default: 40px) and setDragRegionHeight() method for runtime configuration. The hardcoded 40px value is now replaced with a configurable parameter. Commit: 0247d72

[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• registry.npmmirror.com
  • Triggering command: npm install (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
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[yorkie]

快速上下拖拽时，会出现两个问题：

1. 光标和窗口有延迟，会导致光标可能跳出窗口
2. 当光标跳出窗口，就无法拖动，但此时用户并没有去掉拖拽操作（没有 Release 鼠标左键）

因此，你需要作出如下修改：

1. 尽量保证光标和窗口的拖动不要有延时
2. 当用户没有去掉拖拽操作，就需要继续更新窗口位置，判断光标位置是否在拖拽区域，仅针对拖拽开始的时候

[yorkie]

Suggested change

	dragRegionHeight = 40; // Default to 40 pixels
	dragRegionHeight = 25;

[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• registry.npmmirror.com
  • Triggering command: npm install (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[Copilot]

快速上下拖拽时，会出现两个问题：

1. 光标和窗口有延迟，会导致光标可能跳出窗口
   ...

I've improved the macOS window dragging implementation to address both issues:

1. Eliminated cursor-window delay: Changed to delta-based positioning that tracks relative mouse movement instead of absolute positioning, providing immediate response.

2. Continue dragging outside window: Moved dragging check to top of handleCursorMove() and skip bounds checking when dragging is active, so dragging continues regardless of cursor position until mouse release.

Key improvements:

• Use incremental delta movement for smoother, more responsive positioning
• Prioritize window dragging over normal cursor bounds checking
• Track last mouse position to calculate precise movement increments
• Only update window position when actual movement occurs

Commit: 09f739b

[yorkie]

拖拽时，鼠标的移动距离和窗口的移动距离没有对齐，请修复

[Copilot]

拖拽时，鼠标的移动距离和窗口的移动距离没有对齐，请修复

Fixed the mouse-window distance alignment issue. Replaced the delta-based movement approach with a fixed offset calculation that ensures perfect 1:1 mapping between mouse movement and window movement. The window now maintains a consistent offset from the mouse cursor throughout the entire drag operation, eliminating any drift or misalignment. Commit: 59ed508