Function sendKey

tensorboard/webapp/testing/dom.ts:51–168

(
  fixture: ComponentFixture<T>,
  eventTarget: DebugElement,
  args: SendKeyArgs
)

 * presses.
 */
export function sendKey<T>(
  fixture: ComponentFixture<T>,
  eventTarget: DebugElement,
  args: SendKeyArgs
) {
  const {prevString, key, startingCursorIndex} = args;

  const el = eventTarget.nativeElement;
  const canSetCursor =
    el instanceof HTMLInputElement &&
    el.type !== 'date' &&
    el.type !== 'number';

  let nextString: string;
  let nextCursorIndex: number;
  // KeyCode is deprecated but some Angular material components make use of it.
  let keyCode: number;
  let emitKeyPressAndInput = true;

  switch (key) {
    case 'Backspace':
      nextString =
        prevString.slice(0, startingCursorIndex - 1) +
        prevString.slice(startingCursorIndex);
      nextCursorIndex = startingCursorIndex - 1;
      keyCode = 0x08;
      break;
    case 'Space':
      nextString =
        prevString.slice(0, startingCursorIndex) +
        ' ' +
        prevString.slice(startingCursorIndex);
      nextCursorIndex = startingCursorIndex + 1;
      keyCode = 0x20;
      break;
    case 'ArrowLeft':
      nextString = prevString;
      nextCursorIndex = startingCursorIndex - 1;
      keyCode = 0x25;
      emitKeyPressAndInput = false;
      break;
    case 'ArrowUp':
      nextString = prevString;
      nextCursorIndex = startingCursorIndex - 1;
      keyCode = 0x26;
      emitKeyPressAndInput = false;
      break;
    case 'ArrowRight':
      nextString = prevString;
      nextCursorIndex = startingCursorIndex + 1;
      keyCode = 0x27;
      emitKeyPressAndInput = false;
      break;
    case 'Tab':
      nextString = prevString;
      nextCursorIndex = startingCursorIndex;
      keyCode = 0x09;
      break;