add simple mouse events for price and time scales

[SlicedSilver]

Type of PR: enhancement

To do:

• Tests
• Documentation update

Overview of change:
Adds simple mouse (and touch) event handlers for movement and clicking on the price and time scales. These could be useful for plugin developers.

Adds about 0.44kb to the bundle size.

[Copilot]

Pull Request Overview

This PR adds mouse and touch event support to both time and price scale axis widgets, enabling plugin developers to respond to click and mouse movement events on the axes.

• Introduces a new interface IAxisApi with event subscription methods for axis interactions
• Implements mouse event handling infrastructure in axis widgets with proper event delegation
• Extends existing API classes to expose the new axis event functionality

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/model/axis-widget.ts	Defines core interfaces for axis mouse events and event parameter suppliers
src/model/axis-model.ts	Implements base AxisApi class with event handling infrastructure and parameter conversion
src/gui/axis-mouse-event-helpers.ts	Provides utility functions for firing mouse event delegates with proper parameter mapping
src/gui/time-axis-widget.ts	Adds mouse event handling to time axis widget with delegate firing and cursor override support
src/gui/price-axis-widget.ts	Extends price axis widget with mouse events, inheriting from AxisApi and implementing event methods
src/gui/chart-widget.ts	Adds method to retrieve price axis widget instances for event subscription
src/api/iaxis-api.ts	Defines public interface for axis event subscription and cursor override methods
src/api/time-scale-api.ts	Extends time scale API with axis event methods by inheriting from AxisApi
src/api/price-scale-api.ts	Implements axis event methods in price scale API by delegating to underlying widget
src/api/itime-scale-api.ts	Extends interface to include IAxisApi methods
src/api/iprice-scale-api.ts	Extends interface to include IAxisApi methods

[Copilot]

The delegate is destroyed before unsubscribing from mouseMoved events. If mouseMoved().unsubscribeAll() fails, the _movedDelegate.destroy() on line 55 won't be called, leading to a resource leak.

Suggested change

	widget.clicked().unsubscribeAll(this);
	this._clickedDelegate.destroy();
	widget.mouseMoved().unsubscribeAll(this);
	this._movedDelegate.destroy();
	try {
	widget.clicked().unsubscribeAll(this);
	widget.mouseMoved().unsubscribeAll(this);
	} finally {
	this._clickedDelegate.destroy();
	this._movedDelegate.destroy();
	}

[github-actions]

size-limit report 📦

Path	Size
ESM	46.26 KB (+0.74% 🔺)
ESM createChart	38.03 KB (+1.15% 🔺)
ESM createChartEx	36.76 KB (+1.04% 🔺)
ESM createYieldCurveChart	38.25 KB (+1.08% 🔺)
ESM createOptionsChart	36.95 KB (+1.07% 🔺)
Standalone-ESM	47.72 KB (+0.77% 🔺)
Standalone	47.68 KB (+0.89% 🔺)
Plugin: Text Watermark	1.92 KB (+0.52% 🔺)
Plugin: Image Watermark	1.72 KB (-0.74% 🔽)
Plugin: Series Markers	4.32 KB (-0.16% 🔽)
Series: LineSeries	2.59 KB (+0.42% 🔺)
Series: BaselineSeries	3.23 KB (-0.04% 🔽)
Series: AreaSeries	3.15 KB (-0.31% 🔽)
Series: BarSeries	2.19 KB (+0.23% 🔺)
Series: CandlestickSeries	2.48 KB (-0.4% 🔽)
Series: HistogramSeries	2.23 KB (+0.09% 🔺)
Plugin: UpDownMarkersPrimitive	2.42 KB (+0.61% 🔺)