Method _getChange

src/dd-resizable.ts:254–309

@internal

(event: MouseEvent, dir: string)

  /** @internal */
  protected _getChange(event: MouseEvent, dir: string): TemporalRect {
    const oEvent = this.startEvent;
    const newRect = { // Note: originalRect is a complex object, not a simple Rect, so copy out.
      width: this.originalRect.width,
      height: this.originalRect.height + this.scrolled,
      left: this.originalRect.left,
      right: this.originalRect.right,
      top: this.originalRect.top - this.scrolled,
    };

    const offsetX = event.clientX - oEvent.clientX;
    const offsetY = this.sizeToContent ? 0 : event.clientY - oEvent.clientY; // prevent vert resize
    let moveLeft: boolean;
    let moveUp: boolean;

    const isRtl = this.option.rtl;

    if (!isRtl && dir.indexOf('e') > -1) {
      newRect.width += offsetX;
    } else if (isRtl && dir.indexOf('w') > -1) {
      newRect.width -= offsetX;
    } else if (!isRtl && dir.indexOf('w') > -1) {
      newRect.width -= offsetX;
      newRect.left += offsetX;
      moveLeft = true;
    } else if (isRtl && dir.indexOf('e') > -1) {
      newRect.width += offsetX;
      newRect.right += offsetX;
      moveLeft = true;
    }

    if (dir.indexOf('s') > -1) {
      newRect.height += offsetY;
    } else if (dir.indexOf('n') > -1) {
      newRect.height -= offsetY;
      newRect.top += offsetY
      moveUp = true;
    }

    const constrain = this._constrainSize(newRect.width, newRect.height, moveLeft, moveUp);
    if (Math.round(newRect.width) !== Math.round(constrain.width)) { // round to ignore slight round-off errors
      if (!isRtl && dir.indexOf('w') > -1) {
        newRect.left += newRect.width - constrain.width;
      } else if (isRtl && dir.indexOf('e') > -1) {
        newRect.right -= newRect.width - constrain.width;
      }
      newRect.width = constrain.width;
    }
    if (Math.round(newRect.height) !== Math.round(constrain.height)) {
      if (dir.indexOf('n') > -1) {
        newRect.top += newRect.height - constrain.height;
      }
      newRect.height = constrain.height;
    }
    return newRect;
  }

  /** @internal constrain the size to the set min/max values */