refactor(grid, regions): refactor to not redraw whole chart

- remove .redrawWithoutRescale() and replace its call to grid/regions APIs directly
to reduce performance burden
- remove separated grid.x.ts, grid.y.ts files and merge into grid.ts

Ref naver#3037

src/Chart/api/grid.ts

@@ -0,0 +1,206 @@
+/**
+ * Copyright (c) 2017 ~ present NAVER Corp.
+ * billboard.js project is licensed under the MIT license
+ */
+import {extend, isTabVisible} from "../../module/util";
+
+type GridsParam = {
+	value?: number,
+	class?: string,
+	text?: string
+}[];
+
+/**
+ * Update grid lines.
+ * @param {Array} grids grid lines to update
+ * @param {string} axisId axis' id: "x" or "y"
+ * @returns {Array}
+ * @private
+ */
+function grid(grids: GridsParam, axisId: "x" | "y"): GridsParam {
+	const $$ = this.internal;
+	const {config} = $$;
+	const withTransition = config.transition_duration && isTabVisible();
+	const gridPropLines = `grid_${axisId}_lines`;
+
+	if (!grids) {
+		return config[gridPropLines];
+	}
+
+	config[gridPropLines] = grids;
+
+	$$.updateGrid();
+	$$.redrawGrid(withTransition);
+
+	return config[gridPropLines];
+}
+
+/**
+ * Add grid lines.
+ * @param {Array|object} grids grid lines to add
+ * @param {string} axisId axis' id: "x" or "y"
+ * @returns {Array}
+ * @private
+ */
+function add(grids: GridsParam, axisId: "x" | "y"): GridsParam {
+	const gridPropLines = `grid_${axisId}_lines`;
+
+	return grid.bind(this)(
+		this.internal.config[gridPropLines].concat(grids || []),
+		axisId
+	);
+}
+
+/**
+ * Remove grid lines.
+ * @param {object} grids grid lines to remove
+ * @param {boolean} isXAxis weather is x axis or not
+ * @private
+ */
+function remove(grids: GridsParam | undefined, isXAxis: boolean): void {
+	this.internal.removeGridLines(grids, isXAxis);
+}
+
+/**
+ * Update x grid lines.
+ * @function xgrids
+ * @instance
+ * @memberof Chart
+ * @param {Array} grids X grid lines will be replaced with this argument. The format of this argument is the same as grid.x.lines.
+ * @returns {Array}
+ * @example
+ *  // Show 2 x grid lines
+ * chart.xgrids([
+ *    {value: 1, text: "Label 1"},
+ *    {value: 4, text: "Label 4"}
+ * ]);
+ * // --> Returns: [{value: 1, text: "Label 1"}, {value: 4, text: "Label 4"}]
+ */
+const xgrids = function(grids: GridsParam): GridsParam {
+	return grid.bind(this)(grids, "x");
+};
+
+extend(xgrids, {
+	/**
+	 * Add x grid lines.<br>
+	 * This API adds new x grid lines instead of replacing like xgrids.
+	 * @function xgrids․add
+	 * @instance
+	 * @memberof Chart
+	 * @param {Array|object} grids New x grid lines will be added. The format of this argument is the same as grid.x.lines and it's possible to give an Object if only one line will be added.
+	 * @returns {Array}
+	 * @example
+	 *  // Add a new x grid line
+	 * chart.xgrids.add(
+	 *   {value: 4, text: "Label 4"}
+	 * );
+	 *
+	 * // Add new x grid lines
+	 * chart.xgrids.add([
+	 *   {value: 2, text: "Label 2"},
+	 *   {value: 4, text: "Label 4"}
+	 * ]);
+	 */
+	add(grids: GridsParam): GridsParam {
+		return add.bind(this)(grids, "x");
+	},
+
+	/**
+	 * Remove x grid lines.<br>
+	 * This API removes x grid lines.
+	 * @function xgrids․remove
+	 * @instance
+	 * @memberof Chart
+	 * @param {object} grids This argument should include value or class. If value is given, the x grid lines that have specified x value will be removed. If class is given, the x grid lines that have specified class will be removed. If args is not given, all of x grid lines will be removed.
+	 * @param {number} [grids.value] target value
+	 * @param {string} [grids.class] target class
+	 * @returns {void}
+	 * @example
+	 * // x grid line on x = 2 will be removed
+	 * chart.xgrids.remove({value: 2});
+	 *
+	 * // x grid lines that have 'grid-A' will be removed
+	 * chart.xgrids.remove({
+	 *   class: "grid-A"
+	 * });
+	 *
+	 * // all of x grid lines will be removed
+	 * chart.xgrids.remove();
+	 */
+	remove(grids?: GridsParam): void { // TODO: multiple
+		return remove.bind(this)(grids, true);
+	}
+});
+
+/**
+ * Update y grid lines.
+ * @function ygrids
+ * @instance
+ * @memberof Chart
+ * @param {Array} grids Y grid lines will be replaced with this argument. The format of this argument is the same as grid.y.lines.
+ * @returns {object}
+ * @example
+ *  // Show 2 y grid lines
+ * chart.ygrids([
+ *    {value: 100, text: "Label 1"},
+ *    {value: 400, text: "Label 4"}
+ * ]);
+ * // --> Returns: [{value: 100, text: "Label 1"}, {value: 400, text: "Label 4"}]
+ */
+const ygrids = function(grids: GridsParam): GridsParam {
+	return grid.bind(this)(grids, "y");
+};
+
+extend(ygrids, {
+	/**
+	 * Add y grid lines.<br>
+	 * This API adds new y grid lines instead of replacing like ygrids.
+	 * @function ygrids․add
+	 * @instance
+	 * @memberof Chart
+	 * @param {Array|object} grids New y grid lines will be added. The format of this argument is the same as grid.y.lines and it's possible to give an Object if only one line will be added.
+	 * @returns {object}
+	 * @example
+	 *  // Add a new x grid line
+	 * chart.ygrids.add(
+	 *   {value: 400, text: "Label 4"}
+	 * );
+	 *
+	 * // Add new x grid lines
+	 * chart.ygrids.add([
+	 *   {value: 200, text: "Label 2"},
+	 *   {value: 400, text: "Label 4"}
+	 * ]);
+	 */
+	add(grids: GridsParam): GridsParam {
+		return add.bind(this)(grids, "y");
+	},
+
+	/**
+	 * Remove y grid lines.<br>
+	 * This API removes x grid lines.
+	 * @function ygrids․remove
+	 * @instance
+	 * @memberof Chart
+	 * @param {object} grids This argument should include value or class. If value is given, the y grid lines that have specified y value will be removed. If class is given, the y grid lines that have specified class will be removed. If args is not given, all of y grid lines will be removed.
+	 * @param {number} [grids.value] target value
+	 * @param {string} [grids.class] target class
+	 * @returns {void}
+	 * @example
+	 * // y grid line on y = 200 will be removed
+	 * chart.ygrids.remove({value: 200});
+	 *
+	 * // y grid lines that have 'grid-A' will be removed
+	 * chart.ygrids.remove({
+	 *   class: "grid-A"
+	 * });
+	 *
+	 * // all of y grid lines will be removed
+	 * chart.ygrids.remove();
+	 */
+	remove(grids?: GridsParam): void { // TODO: multiple
+		return remove.bind(this)(grids, false);
+	}
+});
+
+export default {xgrids, ygrids};