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{ DIRECTION } from '../../constant';\nimport { BBox } from '../../dependents';\nimport { Padding } from '../../interface';\n\nexport type PaddingCalCtor = {\n readonly instance: (top?: number, right?: number, bottom?: number, left?: number) => PaddingCal;\n};\n\n/** @ignore */\nexport class PaddingCal {\n private top: number;\n private right: number;\n private bottom: number;\n private left: number;\n\n /**\n * 使用静态方法创建一个\n * @param top\n * @param right\n * @param bottom\n * @param left\n */\n public static instance(top: number = 0, right: number = 0, bottom: number = 0, left: number = 0) {\n return new PaddingCal(top, right, bottom, left);\n }\n\n /**\n * 初始的 padding 数据\n * @param top\n * @param right\n * @param bottom\n * @param left\n */\n constructor(top: number = 0, right: number = 0, bottom: number = 0, left: number = 0) {\n this.top = top;\n this.right = right;\n this.bottom = bottom;\n this.left = left;\n }\n\n /**\n * 取最大区间\n * @param padding\n */\n public max(padding: Padding): PaddingCal {\n const [top, right, bottom, left] = padding;\n\n this.top = Math.max(this.top, top);\n this.right = Math.max(this.right, right);\n this.bottom = Math.max(this.bottom, bottom);\n this.left = Math.max(this.left, left);\n\n return this;\n }\n\n /**\n * 四周增加 padding\n * @param padding\n */\n public shrink(padding: Padding): PaddingCal {\n const [top, right, bottom, left] = padding;\n\n this.top += top;\n this.right += right;\n this.bottom += bottom;\n this.left += left;\n\n return this;\n }\n\n /**\n * 在某一个方向增加 padding\n * @param bbox\n * @param direction\n */\n public inc(bbox: BBox, direction: DIRECTION): PaddingCal {\n const { width, height } = bbox;\n\n switch (direction) {\n case DIRECTION.TOP:\n case DIRECTION.TOP_LEFT:\n case DIRECTION.TOP_RIGHT:\n this.top += height;\n break;\n\n case DIRECTION.RIGHT:\n case DIRECTION.RIGHT_TOP:\n case DIRECTION.RIGHT_BOTTOM:\n this.right += width;\n break;\n\n case DIRECTION.BOTTOM:\n case DIRECTION.BOTTOM_LEFT:\n case DIRECTION.BOTTOM_RIGHT:\n this.bottom += height;\n break;\n\n case DIRECTION.LEFT:\n case DIRECTION.LEFT_TOP:\n case DIRECTION.LEFT_BOTTOM:\n this.left += width;\n break;\n default:\n break;\n }\n\n return this;\n }\n\n /**\n * 获得最终的 padding\n */\n public getPadding(): Padding {\n return [this.top, this.right, this.bottom, this.left];\n }\n\n /**\n * clone 一个 padding cal\n */\n public clone(): PaddingCal {\n return new PaddingCal(...this.getPadding());\n }\n}\n"]} |