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see GridStack root license\n */\n\nimport { isTouch, pointerdown, touchend, touchmove, touchstart } from './dd-touch';\nimport { GridItemHTMLElement } from './gridstack';\n\nexport interface DDResizableHandleOpt {\n  element?: string | HTMLElement;\n  start?: (event: MouseEvent) => void;\n  move?: (event: MouseEvent) => void;\n  stop?: (event: MouseEvent) => void;\n}\n\nexport class DDResizableHandle {\n  /** @internal */\n  protected el: HTMLElement;\n  /** @internal true after we've moved enough pixels to start a resize */\n  protected moving = false;\n  /** @internal */\n  protected mouseDownEvent: MouseEvent;\n  /** @internal */\n  protected static prefix = 'ui-resizable-';\n\n  constructor(protected host: GridItemHTMLElement, protected dir: string, protected option: DDResizableHandleOpt) {\n    // create var event binding so we can easily remove and still look like TS methods (unlike anonymous functions)\n    this._mouseDown = this._mouseDown.bind(this);\n    this._mouseMove = this._mouseMove.bind(this);\n    this._mouseUp = this._mouseUp.bind(this);\n    this._keyEvent = this._keyEvent.bind(this);\n\n    this._init();\n  }\n\n  /** @internal */\n  protected _init(): DDResizableHandle {\n    if (this.option.element) {\n      try {\n        this.el = this.option.element instanceof HTMLElement\n          ? this.option.element\n          : this.host.querySelector(this.option.element)\n      } catch (error) {\n        this.option.element = undefined // make sure destroy handles it correctly\n        console.error(\"Query for resizeable handle failed, falling back\", error)\n      }\n    }\n\n    if (!this.el) {\n      this.el = document.createElement('div');\n      this.host.appendChild(this.el);\n    }\n\n    this.el.classList.add('ui-resizable-handle');\n    this.el.classList.add(`${DDResizableHandle.prefix}${this.dir}`);\n    this.el.style.zIndex = '100';\n    this.el.style.userSelect = 'none';\n\n    this.el.addEventListener('mousedown', this._mouseDown);\n    if (isTouch) {\n      this.el.addEventListener('touchstart', touchstart);\n      this.el.addEventListener('pointerdown', pointerdown);\n      // this.el.style.touchAction = 'none'; // not needed unlike pointerdown doc comment\n    }\n\n    return this;\n  }\n\n  /** call this when resize handle needs to be removed and cleaned up */\n  public destroy(): DDResizableHandle {\n    if (this.moving) this._mouseUp(this.mouseDownEvent);\n    this.el.removeEventListener('mousedown', this._mouseDown);\n    if (isTouch) {\n      this.el.removeEventListener('touchstart', touchstart);\n      this.el.removeEventListener('pointerdown', pointerdown);\n    }\n    if (!this.option.element) {\n      this.host.removeChild(this.el);\n    }\n    delete this.el;\n    delete this.host;\n    return this;\n  }\n\n  /** @internal called on mouse down on us: capture move on the entire document (mouse might not stay on us) until we release the mouse */\n  protected _mouseDown(e: MouseEvent): void {\n    this.mouseDownEvent = e;\n    document.addEventListener('mousemove', this._mouseMove, { capture: true, passive: true}); // capture, not bubble\n    document.addEventListener('mouseup', this._mouseUp, true);\n    if (isTouch) {\n      this.el.addEventListener('touchmove', touchmove);\n      this.el.addEventListener('touchend', touchend);\n    }\n    e.stopPropagation();\n    e.preventDefault();\n  }\n\n  /** @internal */\n  protected _mouseMove(e: MouseEvent): void {\n    const s = this.mouseDownEvent;\n    if (this.moving) {\n      this._triggerEvent('move', e);\n    } else if (Math.abs(e.x - s.x) + Math.abs(e.y - s.y) > 2) {\n      // don't start unless we've moved at least 3 pixels\n      this.moving = true;\n      this._triggerEvent('start', this.mouseDownEvent);\n      this._triggerEvent('move', e);\n      // now track keyboard events to cancel\n      document.addEventListener('keydown', this._keyEvent);\n    }\n    e.stopPropagation();\n    // e.preventDefault(); passive = true\n  }\n\n  /** @internal */\n  protected _mouseUp(e: MouseEvent): void {\n    if (this.moving) {\n      this._triggerEvent('stop', e);\n      document.removeEventListener('keydown', this._keyEvent);\n    }\n    document.removeEventListener('mousemove', this._mouseMove, true);\n    document.removeEventListener('mouseup', this._mouseUp, true);\n    if (isTouch) {\n      this.el.removeEventListener('touchmove', touchmove);\n      this.el.removeEventListener('touchend', touchend);\n    }\n    delete this.moving;\n    delete this.mouseDownEvent;\n    e.stopPropagation();\n    e.preventDefault();\n  }\n\n  /** @internal call when keys are being pressed - use Esc to cancel */\n  protected _keyEvent(e: KeyboardEvent): void {\n    if (e.key === 'Escape') {\n      this.host.gridstackNode?.grid?.engine.restoreInitial();\n      this._mouseUp(this.mouseDownEvent);\n    }\n  }\n\n\n\n  /** @internal */\n  protected _triggerEvent(name: string, event: MouseEvent): DDResizableHandle {\n    if (this.option[name]) this.option[name](event);\n    return this;\n  }\n}\n"]}