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a container that applies padding and background to all children\n */\nexport class Box implements Component {\n\tchildren: Component[] = [];\n\tprivate paddingX: number;\n\tprivate paddingY: number;\n\tprivate bgFn?: (text: string) => string;\n\n\t// Cache for rendered output\n\tprivate cache?: RenderCache;\n\n\tconstructor(paddingX = 1, paddingY = 1, bgFn?: (text: string) => string) {\n\t\tthis.paddingX = paddingX;\n\t\tthis.paddingY = paddingY;\n\t\tthis.bgFn = bgFn;\n\t}\n\n\taddChild(component: Component): void {\n\t\tthis.children.push(component);\n\t\tthis.invalidateCache();\n\t}\n\n\tremoveChild(component: Component): void {\n\t\tconst index = this.children.indexOf(component);\n\t\tif (index !== -1) {\n\t\t\tthis.children.splice(index, 1);\n\t\t\tthis.invalidateCache();\n\t\t}\n\t}\n\n\tclear(): void {\n\t\tthis.children = [];\n\t\tthis.invalidateCache();\n\t}\n\n\tsetBgFn(bgFn?: (text: string) => string): void {\n\t\tthis.bgFn = bgFn;\n\t\t// Don't invalidate here - we'll detect bgFn changes by sampling output\n\t}\n\n\tprivate invalidateCache(): void {\n\t\tthis.cache = undefined;\n\t}\n\n\tprivate matchCache(width: number, childLines: string[], bgSample: string | undefined): boolean {\n\t\tconst cache = this.cache;\n\t\treturn (\n\t\t\t!!cache &&\n\t\t\tcache.width === width &&\n\t\t\tcache.bgSample === bgSample &&\n\t\t\tcache.childLines.length === childLines.length &&\n\t\t\tcache.childLines.every((line, i) => line === childLines[i])\n\t\t);\n\t}\n\n\tinvalidate(): void {\n\t\tthis.invalidateCache();\n\t\tfor (const child of this.children) {\n\t\t\tchild.invalidate?.();\n\t\t}\n\t}\n\n\trender(width: number): string[] {\n\t\tif (this.children.length === 0) {\n\t\t\treturn [];\n\t\t}\n\n\t\tconst contentWidth = Math.max(1, width - this.paddingX * 2);\n\t\tconst leftPad = \" \".repeat(this.paddingX);\n\n\t\t// Render all children\n\t\tconst childLines: string[] = [];\n\t\tfor (const child of this.children) {\n\t\t\tconst lines = child.render(contentWidth);\n\t\t\tfor (const line of lines) {\n\t\t\t\tchildLines.push(leftPad + line);\n\t\t\t}\n\t\t}\n\n\t\tif (childLines.length === 0) {\n\t\t\treturn [];\n\t\t}\n\n\t\t// Check if bgFn output changed by sampling\n\t\tconst bgSample = this.bgFn ? this.bgFn(\"test\") : undefined;\n\n\t\t// Check cache validity\n\t\tif (this.matchCache(width, childLines, bgSample)) {\n\t\t\treturn this.cache!.lines;\n\t\t}\n\n\t\t// Apply background and padding\n\t\tconst result: string[] = [];\n\n\t\t// Top padding\n\t\tfor (let i = 0; i < this.paddingY; i++) {\n\t\t\tresult.push(this.applyBg(\"\", width));\n\t\t}\n\n\t\t// Content\n\t\tfor (const line of childLines) {\n\t\t\tresult.push(this.applyBg(line, width));\n\t\t}\n\n\t\t// Bottom padding\n\t\tfor (let i = 0; i < this.paddingY; i++) {\n\t\t\tresult.push(this.applyBg(\"\", width));\n\t\t}\n\n\t\t// Update cache\n\t\tthis.cache = { childLines, width, bgSample, lines: result };\n\n\t\treturn result;\n\t}\n\n\tprivate applyBg(line: string, width: number): string {\n\t\tconst visLen = visibleWidth(line);\n\t\tconst padNeeded = Math.max(0, width - visLen);\n\t\tconst padded = line + \" \".repeat(padNeeded);\n\n\t\tif (this.bgFn) {\n\t\t\treturn applyBackgroundToLine(padded, width, this.bgFn);\n\t\t}\n\t\treturn padded;\n\t}\n}\n"]}