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/**
* @typedef { import('../core/core.controller.js').default } Chart
*/
/**
* Abstract class that allows abstracting platform dependencies away from the chart.
*/
export default class BasePlatform {
/**
* Called at chart construction time, returns a context2d instance implementing
* the [W3C Canvas 2D Context API standard]{@link https://www.w3.org/TR/2dcontext/}.
* @param {HTMLCanvasElement} canvas - The canvas from which to acquire context (platform specific)
* @param {number} [aspectRatio] - The chart options
*/
acquireContext(canvas, aspectRatio) {} // eslint-disable-line no-unused-vars
/**
* Called at chart destruction time, releases any resources associated to the context
* previously returned by the acquireContext() method.
* @param {CanvasRenderingContext2D} context - The context2d instance
* @returns {boolean} true if the method succeeded, else false
*/
releaseContext(context) { // eslint-disable-line no-unused-vars
return false;
}
/**
* Registers the specified listener on the given chart.
* @param {Chart} chart - Chart from which to listen for event
* @param {string} type - The ({@link ChartEvent}) type to listen for
* @param {function} listener - Receives a notification (an object that implements
* the {@link ChartEvent} interface) when an event of the specified type occurs.
*/
addEventListener(chart, type, listener) {} // eslint-disable-line no-unused-vars
/**
* Removes the specified listener previously registered with addEventListener.
* @param {Chart} chart - Chart from which to remove the listener
* @param {string} type - The ({@link ChartEvent}) type to remove
* @param {function} listener - The listener function to remove from the event target.
*/
removeEventListener(chart, type, listener) {} // eslint-disable-line no-unused-vars
/**
* @returns {number} the current devicePixelRatio of the device this platform is connected to.
*/
getDevicePixelRatio() {
return 1;
}
/**
* Returns the maximum size in pixels of given canvas element.
* @param {HTMLCanvasElement} element
* @param {number} [width] - content width of parent element
* @param {number} [height] - content height of parent element
* @param {number} [aspectRatio] - aspect ratio to maintain
*/
getMaximumSize(element, width, height, aspectRatio) {
width = Math.max(0, width || element.width);
height = height || element.height;
return {
width,
height: Math.max(0, aspectRatio ? Math.floor(width / aspectRatio) : height)
};
}
/**
* @param {HTMLCanvasElement} canvas
* @returns {boolean} true if the canvas is attached to the platform, false if not.
*/
isAttached(canvas) { // eslint-disable-line no-unused-vars
return true;
}
/**
* Updates config with platform specific requirements
* @param {import('../core/core.config.js').default} config
*/
updateConfig(config) { // eslint-disable-line no-unused-vars
// no-op
}
}
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