private _containInsideBoundaryOnResize()

in src/cdk/drag-drop/drag-ref.ts [1355:1410]
41 lines of code
17 McCabe index (conditional complexity)

  private _containInsideBoundaryOnResize() {
    let {x, y} = this._passiveTransform;

    if ((x === 0 && y === 0) || this.isDragging() || !this._boundaryElement) {
      return;
    }

    const boundaryRect = this._boundaryElement.getBoundingClientRect();
    const elementRect = this._rootElement.getBoundingClientRect();

    // It's possible that the element got hidden away after dragging (e.g. by switching to a
    // different tab). Don't do anything in this case so we don't clear the user's position.
    if (
      (boundaryRect.width === 0 && boundaryRect.height === 0) ||
      (elementRect.width === 0 && elementRect.height === 0)
    ) {
      return;
    }

    const leftOverflow = boundaryRect.left - elementRect.left;
    const rightOverflow = elementRect.right - boundaryRect.right;
    const topOverflow = boundaryRect.top - elementRect.top;
    const bottomOverflow = elementRect.bottom - boundaryRect.bottom;

    // If the element has become wider than the boundary, we can't
    // do much to make it fit so we just anchor it to the left.
    if (boundaryRect.width > elementRect.width) {
      if (leftOverflow > 0) {
        x += leftOverflow;
      }

      if (rightOverflow > 0) {
        x -= rightOverflow;
      }
    } else {
      x = 0;
    }

    // If the element has become taller than the boundary, we can't
    // do much to make it fit so we just anchor it to the top.
    if (boundaryRect.height > elementRect.height) {
      if (topOverflow > 0) {
        y += topOverflow;
      }

      if (bottomOverflow > 0) {
        y -= bottomOverflow;
      }
    } else {
      y = 0;
    }

    if (x !== this._passiveTransform.x || y !== this._passiveTransform.y) {
      this.setFreeDragPosition({y, x});
    }
  }