Mailspring/spec/components/fixed-popover-spec.jsx

import React from 'react';
import FixedPopover from '../../src/components/fixed-popover';
import {renderIntoDocument} from '../nylas-test-utils'


const {Directions: {Up, Down, Left, Right}} = FixedPopover

const makePopover = (props = {})=> {
  props.originRect = props.originRect ? props.originRect : {};
  const popover = renderIntoDocument(<FixedPopover {...props}/>);
  if (props.initialState) {
    popover.setState(props.initialState)
  }
  return popover
};

describe('FixedPopover', ()=> {
  describe('computeAdjustedOffsetAndDirection', ()=> {
    beforeEach(()=> {
      this.popover = makePopover()
      this.PADDING = 10
      this.windowDimensions = {
        height: 500,
        width: 500,
      }
    });

    const compute = (direction, {fallback, top, left, bottom, right})=> {
      return this.popover.computeAdjustedOffsetAndDirection({
        direction,
        windowDimensions: this.windowDimensions,
        currentRect: {
          top,
          left,
          bottom,
          right,
        },
        fallback,
        offsetPadding: this.PADDING,
      })
    }

    it('returns null when no overflows present', ()=> {
      const res = compute(Up, {top: 10, left: 10, right: 20, bottom: 20})
      expect(res).toBe(null)
    });

    describe('when overflowing on 1 side of the window', ()=> {
      it('returns fallback direction when it is specified', ()=> {
        const {offset, direction} = compute(Up, {fallback: Left, top: -10, left: 10, right: 20, bottom: 10})
        expect(offset).toEqual({})
        expect(direction).toEqual(Left)
      });

      it('inverts direction if is Up and overflows on the top', ()=> {
        const {offset, direction} = compute(Up, {top: -10, left: 10, right: 20, bottom: 10})
        expect(offset).toEqual({})
        expect(direction).toEqual(Down)
      });

      it('inverts direction if is Down and overflows on the bottom', ()=> {
        const {offset, direction} = compute(Down, {top: 490, left: 10, right: 20, bottom: 510})
        expect(offset).toEqual({})
        expect(direction).toEqual(Up)
      });

      it('inverts direction if is Right and overflows on the right', ()=> {
        const {offset, direction} = compute(Right, {top: 10, left: 490, right: 510, bottom: 20})
        expect(offset).toEqual({})
        expect(direction).toEqual(Left)
      });

      it('inverts direction if is Left and overflows on the left', ()=> {
        const {offset, direction} = compute(Left, {top: 10, left: -10, right: 10, bottom: 20})
        expect(offset).toEqual({})
        expect(direction).toEqual(Right)
      });

      [Up, Down, Left, Right].forEach((dir)=> {
        if (dir === Up || dir === Down) {
          it('moves left if its overflowing on the right', ()=> {
            const {offset, direction} = compute(dir, {top: 10, left: 490, right: 510, bottom: 20})
            expect(offset).toEqual({x: -20})
            expect(direction).toEqual(dir)
          });

          it('moves right if overflows on the left', ()=> {
            const {offset, direction} = compute(dir, {top: 10, left: -10, right: 10, bottom: 20})
            expect(offset).toEqual({x: 20})
            expect(direction).toEqual(dir)
          });
        }

        if (dir === Left || dir === Right) {
          it('moves up if its overflowing on the bottom', ()=> {
            const {offset, direction} = compute(dir, {top: 490, left: 10, right: 20, bottom: 510})
            expect(offset).toEqual({y: -20})
            expect(direction).toEqual(dir)
          });

          it('moves down if overflows on the top', ()=> {
            const {offset, direction} = compute(dir, {top: -10, left: 10, right: 20, bottom: 10})
            expect(offset).toEqual({y: 20})
            expect(direction).toEqual(dir)
          });
        }
      })
    })

    describe('when overflowing on 2 sides of the window', ()=> {
      describe('when direction is up', ()=> {
        it('computes correctly when it overflows up and right', ()=> {
          const {offset, direction} = compute(Up, {top: -10, left: 10, right: 510, bottom: 10})
          expect(offset).toEqual({x: -20})
          expect(direction).toEqual(Down)
        });

        it('computes correctly when it overflows up and left', ()=> {
          const {offset, direction} = compute(Up, {top: -10, left: -10, right: 10, bottom: 10})
          expect(offset).toEqual({x: 20})
          expect(direction).toEqual(Down)
        });
      });

      describe('when direction is right', ()=> {
        it('computes correctly when it overflows right and up', ()=> {
          const {offset, direction} = compute(Right, {top: -10, left: 490, right: 510, bottom: 10})
          expect(offset).toEqual({y: 20})
          expect(direction).toEqual(Left)
        });

        it('computes correctly when it overflows right and down', ()=> {
          const {offset, direction} = compute(Right, {top: 490, left: 490, right: 510, bottom: 510})
          expect(offset).toEqual({y: -20})
          expect(direction).toEqual(Left)
        });
      });

      describe('when direction is left', ()=> {
        it('computes correctly when it overflows left and up', ()=> {
          const {offset, direction} = compute(Left, {top: -10, left: -10, right: 10, bottom: 10})
          expect(offset).toEqual({y: 20})
          expect(direction).toEqual(Right)
        });

        it('computes correctly when it overflows left and down', ()=> {
          const {offset, direction} = compute(Left, {top: 490, left: -10, right: 10, bottom: 510})
          expect(offset).toEqual({y: -20})
          expect(direction).toEqual(Right)
        });
      });

      describe('when direction is down', ()=> {
        it('computes correctly when it overflows down and left', ()=> {
          const {offset, direction} = compute(Down, {top: 490, left: -10, right: 10, bottom: 510})
          expect(offset).toEqual({x: 20})
          expect(direction).toEqual(Up)
        });

        it('computes correctly when it overflows down and right', ()=> {
          const {offset, direction} = compute(Down, {top: 490, left: 490, right: 510, bottom: 510})
          expect(offset).toEqual({x: -20})
          expect(direction).toEqual(Up)
        });
      });
    });
  });

  describe('computePopoverStyles', ()=> {
    // TODO
  });
});