firefox/browser/components/customizableui/test/browser_panel_keyboard_navigation.js

"use strict";

/**
 * Test keyboard navigation in the app menu panel.
 */

const kHelpButtonId = "appMenu-help-button2";

function getEnabledNavigableElementsForView(panelView) {
  return Array.from(
    panelView.querySelectorAll("button,toolbarbutton,menulist,.text-link")
  ).filter(element => {
    let bounds = element.getBoundingClientRect();
    return !element.disabled && bounds.width > 0 && bounds.height > 0;
  });
}

add_task(async function testUpDownKeys() {
  await gCUITestUtils.openMainMenu();

  let buttons = getEnabledNavigableElementsForView(PanelUI.mainView);

  for (let button of buttons) {
    if (button.disabled) {
      continue;
    }
    EventUtils.synthesizeKey("KEY_ArrowDown");
    Assert.equal(
      document.commandDispatcher.focusedElement,
      button,
      "The correct button should be focused after navigating downward"
    );
  }

  EventUtils.synthesizeKey("KEY_ArrowDown");
  Assert.equal(
    document.commandDispatcher.focusedElement,
    buttons[0],
    "Pressing upwards should cycle around and select the first button again"
  );

  for (let i = buttons.length - 1; i >= 0; --i) {
    let button = buttons[i];
    if (button.disabled) {
      continue;
    }
    EventUtils.synthesizeKey("KEY_ArrowUp");
    Assert.equal(
      document.commandDispatcher.focusedElement,
      button,
      "The first button should be focused after navigating upward"
    );
  }

  await gCUITestUtils.hideMainMenu();
});

add_task(async function testHomeEndKeys() {
  await gCUITestUtils.openMainMenu();

  let buttons = getEnabledNavigableElementsForView(PanelUI.mainView);
  let enabledButtons = buttons.filter(btn => !btn.disabled);
  let firstButton = enabledButtons[0];
  let lastButton = enabledButtons.pop();

  Assert.ok(firstButton != lastButton, "There is more than one button");

  EventUtils.synthesizeKey("KEY_End");
  Assert.equal(
    document.commandDispatcher.focusedElement,
    lastButton,
    "The last button should be focused after pressing End"
  );

  EventUtils.synthesizeKey("KEY_Home");
  Assert.equal(
    document.commandDispatcher.focusedElement,
    firstButton,
    "The first button should be focused after pressing Home"
  );

  await gCUITestUtils.hideMainMenu();
});

add_task(async function testEnterKeyBehaviors() {
  await gCUITestUtils.openMainMenu();

  let buttons = getEnabledNavigableElementsForView(PanelUI.mainView);

  // Navigate to the 'Help' button, which points to a subview.
  EventUtils.synthesizeKey("KEY_ArrowUp");
  let focusedElement = document.commandDispatcher.focusedElement;
  Assert.equal(
    focusedElement,
    buttons[buttons.length - 1],
    "The last button should be focused after navigating upward"
  );

  // Make sure the Help button is in focus.
  while (
    !focusedElement ||
    !focusedElement.id ||
    focusedElement.id != kHelpButtonId
  ) {
    EventUtils.synthesizeKey("KEY_ArrowUp");
    focusedElement = document.commandDispatcher.focusedElement;
  }
  EventUtils.synthesizeKey("KEY_Enter");

  let helpView = document.getElementById("PanelUI-helpView");
  await BrowserTestUtils.waitForEvent(helpView, "ViewShown");

  let helpButtons = getEnabledNavigableElementsForView(helpView);
  Assert.ok(
    helpButtons[0].classList.contains("subviewbutton-back"),
    "First button in help view should be a back button"
  );

  // For posterity, check navigating the subview using up/ down arrow keys as well.
  // When opening a subview, the first control *after* the Back button gets
  // focus.
  EventUtils.synthesizeKey("KEY_ArrowUp");
  focusedElement = document.commandDispatcher.focusedElement;
  Assert.equal(
    focusedElement,
    helpButtons[0],
    "The Back button should be focused after navigating upward"
  );
  for (let i = helpButtons.length - 1; i >= 0; --i) {
    let button = helpButtons[i];
    if (button.disabled) {
      continue;
    }
    EventUtils.synthesizeKey("KEY_ArrowUp");
    focusedElement = document.commandDispatcher.focusedElement;
    Assert.equal(
      focusedElement,
      button,
      "The previous button should be focused after navigating upward"
    );
  }

  // Make sure the back button is in focus again.
  while (focusedElement != helpButtons[0]) {
    EventUtils.synthesizeKey("KEY_ArrowDown");
    focusedElement = document.commandDispatcher.focusedElement;
  }

  // The first button is the back button. Hittin Enter should navigate us back.
  let promise = BrowserTestUtils.waitForEvent(PanelUI.mainView, "ViewShown");
  EventUtils.synthesizeKey("KEY_Enter");
  await promise;

  // Let's test a 'normal' command button.
  focusedElement = document.commandDispatcher.focusedElement;
  const kFindButtonId = "appMenu-find-button2";
  while (
    !focusedElement ||
    !focusedElement.id ||
    focusedElement.id != kFindButtonId
  ) {
    EventUtils.synthesizeKey("KEY_ArrowUp");
    focusedElement = document.commandDispatcher.focusedElement;
  }
  let findBarPromise = gBrowser.isFindBarInitialized()
    ? null
    : BrowserTestUtils.waitForEvent(gBrowser.selectedTab, "TabFindInitialized");
  Assert.equal(
    focusedElement.id,
    kFindButtonId,
    "Find button should be selected"
  );

  await gCUITestUtils.hidePanelMultiView(PanelUI.panel, () =>
    EventUtils.synthesizeKey("KEY_Enter")
  );

  await findBarPromise;
  Assert.ok(!gFindBar.hidden, "Findbar should have opened");
  gFindBar.close();
});

add_task(async function testLeftRightKeys() {
  await gCUITestUtils.openMainMenu();

  // Navigate to the 'Help' button, which points to a subview.
  let focusedElement = document.commandDispatcher.focusedElement;
  while (
    !focusedElement ||
    !focusedElement.id ||
    focusedElement.id != kHelpButtonId
  ) {
    EventUtils.synthesizeKey("KEY_ArrowUp");
    focusedElement = document.commandDispatcher.focusedElement;
  }
  Assert.equal(
    focusedElement.id,
    kHelpButtonId,
    "The last button should be focused after navigating upward"
  );

  // Hitting ArrowRight on a button that points to a subview should navigate us
  // there.
  EventUtils.synthesizeKey("KEY_ArrowRight");
  let helpView = document.getElementById("PanelUI-helpView");
  await BrowserTestUtils.waitForEvent(helpView, "ViewShown");

  // Hitting ArrowLeft should navigate us back.
  let promise = BrowserTestUtils.waitForEvent(PanelUI.mainView, "ViewShown");
  EventUtils.synthesizeKey("KEY_ArrowLeft");
  await promise;

  focusedElement = document.commandDispatcher.focusedElement;
  Assert.equal(
    focusedElement.id,
    kHelpButtonId,
    "Help button should be focused again now that we're back in the main view"
  );

  await gCUITestUtils.hideMainMenu();
});

add_task(async function testTabKey() {
  await gCUITestUtils.openMainMenu();

  let buttons = getEnabledNavigableElementsForView(PanelUI.mainView);

  for (let button of buttons) {
    if (button.disabled) {
      continue;
    }
    EventUtils.synthesizeKey("KEY_Tab");
    Assert.equal(
      document.commandDispatcher.focusedElement,
      button,
      "The correct button should be focused after tabbing"
    );
  }

  EventUtils.synthesizeKey("KEY_Tab");
  Assert.equal(
    document.commandDispatcher.focusedElement,
    buttons[0],
    "Pressing tab should cycle around and select the first button again"
  );

  for (let i = buttons.length - 1; i >= 0; --i) {
    let button = buttons[i];
    if (button.disabled) {
      continue;
    }
    EventUtils.synthesizeKey("KEY_Tab", { shiftKey: true });
    Assert.equal(
      document.commandDispatcher.focusedElement,
      button,
      "The correct button should be focused after shift + tabbing"
    );
  }

  EventUtils.synthesizeKey("KEY_Tab", { shiftKey: true });
  Assert.equal(
    document.commandDispatcher.focusedElement,
    buttons[buttons.length - 1],
    "Pressing shift + tab should cycle around and select the last button again"
  );

  await gCUITestUtils.hideMainMenu();
});

add_task(async function testInterleavedTabAndArrowKeys() {
  await gCUITestUtils.openMainMenu();

  let buttons = getEnabledNavigableElementsForView(PanelUI.mainView);
  let tab = false;

  for (let button of buttons) {
    if (button.disabled) {
      continue;
    }
    if (tab) {
      EventUtils.synthesizeKey("KEY_Tab");
    } else {
      EventUtils.synthesizeKey("KEY_ArrowDown");
    }
    tab = !tab;
  }

  Assert.equal(
    document.commandDispatcher.focusedElement,
    buttons[buttons.length - 1],
    "The last button should be focused after a mix of Tab and ArrowDown"
  );

  await gCUITestUtils.hideMainMenu();
});

add_task(async function testSpaceDownAfterTabNavigation() {
  await gCUITestUtils.openMainMenu();

  let buttons = getEnabledNavigableElementsForView(PanelUI.mainView);
  let button;

  for (button of buttons) {
    if (button.disabled) {
      continue;
    }
    EventUtils.synthesizeKey("KEY_Tab");
    if (button.id == kHelpButtonId) {
      break;
    }
  }

  Assert.equal(
    document.commandDispatcher.focusedElement,
    button,
    "Help button should be focused after tabbing to it."
  );

  // Pressing down space on a button that points to a subview should navigate us
  // there, before keyup.
  EventUtils.synthesizeKey(" ", { type: "keydown" });
  let helpView = document.getElementById("PanelUI-helpView");
  await BrowserTestUtils.waitForEvent(helpView, "ViewShown");

  await gCUITestUtils.hideMainMenu();
});