@netdata/charts/dist/es6/helpers/eventOffset.test.js

Netdata frontend SDK and chart utilities

import eventOffset from "./eventOffset";
describe("eventOffset", function () {
  var mockElement;
  beforeEach(function () {
    mockElement = {
      getBoundingClientRect: jest.fn(function () {
        return {
          left: 100,
          top: 50,
          width: 200,
          height: 150
        };
      })
    };
  });
  it("calculates offset for mouse events", function () {
    var event = {
      target: mockElement,
      clientX: 150,
      clientY: 75,
      type: "click"
    };
    var result = eventOffset(event);
    expect(result).toEqual({
      offsetX: 50,
      offsetY: 25
    });
  });
  it("calculates offset for touch events with initialTouches", function () {
    var event = {
      target: mockElement,
      type: "touchstart"
    };
    var ctx = {
      initialTouches: [{
        pageX: 175,
        pageY: 100
      }]
    };
    var result = eventOffset(event, ctx);
    expect(result).toEqual({
      offsetX: 75,
      offsetY: 50
    });
  });
  it("handles touch events without initialTouches", function () {
    var event = {
      target: mockElement,
      type: "touchmove"
    };
    var result = eventOffset(event, {});
    expect(result).toEqual({
      offsetX: NaN,
      offsetY: NaN
    });
  });
  it("uses srcElement as fallback for target", function () {
    var event = {
      srcElement: mockElement,
      clientX: 120,
      clientY: 60,
      type: "mousedown"
    };
    var result = eventOffset(event);
    expect(result).toEqual({
      offsetX: 20,
      offsetY: 10
    });
  });
  it("handles events with no coordinates", function () {
    var event = {
      target: mockElement,
      type: "click"
    };
    var result = eventOffset(event);
    expect(result).toEqual({
      offsetX: NaN,
      offsetY: NaN
    });
  });
});