layout/xul/nsMenuBarListener.cpp
author Nika Layzell <nika@thelayzells.com>
Tue, 25 Sep 2018 17:34:53 +0200
changeset 507828 5e6dae0c1e5a4939ccd406f14607f7fafffd45a7
parent 481599 a97feb8161b7a4c60a539d83cb702a6e50fab1b1
child 508163 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1448426 - Wrap windows.h to avoid problematic define statements, r=froydnj,glandium By default, windows.h exposes a large number of problematic define statements which are UpperCamelCase, such as a define from `CreateWindow` to `CreateWindow{A,W}`. As many of these names are generic (e.g. CreateFile, CreateWindow), they can mess up Gecko code that may legitimately have its own methods with the same names. The header also defines some traditional SCREAMING_SNAKE_CASE defines which can mess up our code by conflicting with local values. This patch adds a simple code generator which generates wrappers for these defines, and uses them to wrap the windows.h wrapper using the `stl_wrappers` mechanism, allowing us to use windows.h in more places. Differential Revision: https://phabricator.services.mozilla.com/D10932

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsMenuBarListener.h"
#include "nsMenuBarFrame.h"
#include "nsMenuPopupFrame.h"
#include "nsPIWindowRoot.h"

// Drag & Drop, Clipboard
#include "nsIServiceManager.h"
#include "nsWidgetsCID.h"
#include "nsCOMPtr.h"
#include "nsIContent.h"

#include "nsContentUtils.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/TextEvents.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/EventBinding.h"
#include "mozilla/dom/KeyboardEvent.h"
#include "mozilla/dom/KeyboardEventBinding.h"

using namespace mozilla;
using mozilla::dom::Event;
using mozilla::dom::KeyboardEvent;

/*
 * nsMenuBarListener implementation
 */

NS_IMPL_ISUPPORTS(nsMenuBarListener, nsIDOMEventListener)

////////////////////////////////////////////////////////////////////////

int32_t nsMenuBarListener::mAccessKey = -1;
Modifiers nsMenuBarListener::mAccessKeyMask = 0;
bool nsMenuBarListener::mAccessKeyFocuses = false;

nsMenuBarListener::nsMenuBarListener(nsMenuBarFrame* aMenuBarFrame,
                                     nsIContent* aMenuBarContent)
  : mMenuBarFrame(aMenuBarFrame)
  , mEventTarget(aMenuBarContent ? aMenuBarContent->GetComposedDoc() : nullptr)
  , mTopWindowEventTarget(nullptr)
  , mAccessKeyDown(false)
  , mAccessKeyDownCanceled(false)
{
  MOZ_ASSERT(mEventTarget);

  // Hook up the menubar as a key listener on the whole document.  This will
  // see every keypress that occurs, but after everyone else does.

  // Also hook up the listener to the window listening for focus events. This
  // is so we can keep proper state as the user alt-tabs through processes.

  mEventTarget->AddSystemEventListener(NS_LITERAL_STRING("keypress"),
                                       this, false);
  mEventTarget->AddSystemEventListener(NS_LITERAL_STRING("keydown"),
                                       this, false);
  mEventTarget->AddSystemEventListener(NS_LITERAL_STRING("keyup"), this, false);
  mEventTarget->AddSystemEventListener(NS_LITERAL_STRING("mozaccesskeynotfound"),
                                       this, false);
  // Need a capturing event listener if the user has blocked pages from overriding
  // system keys so that we can prevent menu accesskeys from being cancelled.
  mEventTarget->AddEventListener(NS_LITERAL_STRING("keydown"), this, true);

  // mousedown event should be handled in all phase
  mEventTarget->AddEventListener(NS_LITERAL_STRING("mousedown"), this, true);
  mEventTarget->AddEventListener(NS_LITERAL_STRING("mousedown"), this, false);
  mEventTarget->AddEventListener(NS_LITERAL_STRING("blur"), this, true);

  mEventTarget->AddEventListener(
                  NS_LITERAL_STRING("MozDOMFullscreen:Entered"), this, false);

  // Needs to listen to the deactivate event of the window.
  RefPtr<dom::EventTarget> topWindowEventTarget =
    nsContentUtils::GetWindowRoot(aMenuBarContent->GetComposedDoc());
  mTopWindowEventTarget = topWindowEventTarget.get();

  mTopWindowEventTarget->AddSystemEventListener(NS_LITERAL_STRING("deactivate"),
                                                this, true);
}

////////////////////////////////////////////////////////////////////////
nsMenuBarListener::~nsMenuBarListener()
{
  MOZ_ASSERT(!mEventTarget,
             "OnDestroyMenuBarFrame() should've alreay been called");
}

void
nsMenuBarListener::OnDestroyMenuBarFrame()
{
  mEventTarget->RemoveSystemEventListener(NS_LITERAL_STRING("keypress"),
                                          this, false);
  mEventTarget->RemoveSystemEventListener(NS_LITERAL_STRING("keydown"),
                                          this, false);
  mEventTarget->RemoveSystemEventListener(NS_LITERAL_STRING("keyup"),
                                          this, false);
  mEventTarget->RemoveSystemEventListener(
                  NS_LITERAL_STRING("mozaccesskeynotfound"), this, false);
  mEventTarget->RemoveEventListener(NS_LITERAL_STRING("keydown"),
                                    this, true);

  mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mousedown"), this, true);
  mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mousedown"),
                                    this, false);
  mEventTarget->RemoveEventListener(NS_LITERAL_STRING("blur"), this, true);

  mEventTarget->RemoveEventListener(
                  NS_LITERAL_STRING("MozDOMFullscreen:Entered"), this, false);

  mTopWindowEventTarget->RemoveSystemEventListener(
                           NS_LITERAL_STRING("deactivate"), this, true);

  mMenuBarFrame = nullptr;
  mEventTarget = nullptr;
  mTopWindowEventTarget = nullptr;
}

void
nsMenuBarListener::InitializeStatics()
{
  Preferences::AddBoolVarCache(&mAccessKeyFocuses,
                               "ui.key.menuAccessKeyFocuses");
}

nsresult
nsMenuBarListener::GetMenuAccessKey(int32_t* aAccessKey)
{
  if (!aAccessKey)
    return NS_ERROR_INVALID_POINTER;
  InitAccessKey();
  *aAccessKey = mAccessKey;
  return NS_OK;
}

void nsMenuBarListener::InitAccessKey()
{
  if (mAccessKey >= 0)
    return;

  // Compiled-in defaults, in case we can't get LookAndFeel --
  // mac doesn't have menu shortcuts, other platforms use alt.
#ifdef XP_MACOSX
  mAccessKey = 0;
  mAccessKeyMask = 0;
#else
  mAccessKey = dom::KeyboardEvent_Binding::DOM_VK_ALT;
  mAccessKeyMask = MODIFIER_ALT;
#endif

  // Get the menu access key value from prefs, overriding the default:
  mAccessKey = Preferences::GetInt("ui.key.menuAccessKey", mAccessKey);
  switch (mAccessKey) {
  case dom::KeyboardEvent_Binding::DOM_VK_SHIFT:
    mAccessKeyMask = MODIFIER_SHIFT;
    break;
  case dom::KeyboardEvent_Binding::DOM_VK_CONTROL:
    mAccessKeyMask = MODIFIER_CONTROL;
    break;
  case dom::KeyboardEvent_Binding::DOM_VK_ALT:
    mAccessKeyMask = MODIFIER_ALT;
    break;
  case dom::KeyboardEvent_Binding::DOM_VK_META:
    mAccessKeyMask = MODIFIER_META;
    break;
  case dom::KeyboardEvent_Binding::DOM_VK_WIN:
    mAccessKeyMask = MODIFIER_OS;
    break;
  default:
    // Don't touch mAccessKeyMask.
    break;
  }
}

void
nsMenuBarListener::ToggleMenuActiveState()
{
  nsMenuFrame* closemenu = mMenuBarFrame->ToggleMenuActiveState();
  nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
  if (pm && closemenu) {
    nsMenuPopupFrame* popupFrame = closemenu->GetPopup();
    if (popupFrame)
      pm->HidePopup(popupFrame->GetContent(), false, false, true, false);
  }
}

////////////////////////////////////////////////////////////////////////
nsresult
nsMenuBarListener::KeyUp(Event* aKeyEvent)
{
  RefPtr<KeyboardEvent> keyEvent = aKeyEvent->AsKeyboardEvent();
  if (!keyEvent) {
    return NS_OK;
  }

  InitAccessKey();

  //handlers shouldn't be triggered by non-trusted events.
  if (!keyEvent->IsTrusted()) {
    return NS_OK;
  }

  if (mAccessKey && mAccessKeyFocuses)
  {
    bool defaultPrevented = keyEvent->DefaultPrevented();

    // On a press of the ALT key by itself, we toggle the menu's
    // active/inactive state.
    // Get the ascii key code.
    uint32_t theChar = keyEvent->KeyCode();

    if (!defaultPrevented && mAccessKeyDown && !mAccessKeyDownCanceled &&
        (int32_t)theChar == mAccessKey)
    {
      // The access key was down and is now up, and no other
      // keys were pressed in between.
      bool toggleMenuActiveState = true;
      if (!mMenuBarFrame->IsActive()) {
        // First, close all existing popups because other popups shouldn't
        // handle key events when menubar is active and IME should be
        // disabled.
        nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
        if (pm) {
          pm->Rollup(0, false, nullptr, nullptr);
        }
        // If menubar active state is changed or the menubar is destroyed
        // during closing the popups, we should do nothing anymore.
        toggleMenuActiveState = !Destroyed() && !mMenuBarFrame->IsActive();
      }
      if (toggleMenuActiveState) {
        if (!mMenuBarFrame->IsActive()) {
          mMenuBarFrame->SetActiveByKeyboard();
        }
        ToggleMenuActiveState();
      }
    }
    mAccessKeyDown = false;
    mAccessKeyDownCanceled = false;

    bool active = !Destroyed() && mMenuBarFrame->IsActive();
    if (active) {
      keyEvent->StopPropagation();
      keyEvent->PreventDefault();
      return NS_OK; // I am consuming event
    }
  }

  return NS_OK; // means I am NOT consuming event
}

////////////////////////////////////////////////////////////////////////
nsresult
nsMenuBarListener::KeyPress(Event* aKeyEvent)
{
  // if event has already been handled, bail
  if (!aKeyEvent || aKeyEvent->DefaultPrevented()) {
    return NS_OK;       // don't consume event
  }

  //handlers shouldn't be triggered by non-trusted events.
  if (!aKeyEvent->IsTrusted()) {
    return NS_OK;
  }

  InitAccessKey();

  if (mAccessKey)
  {
    // If accesskey handling was forwarded to a child process, wait for
    // the mozaccesskeynotfound event before handling accesskeys.
    WidgetKeyboardEvent* nativeKeyEvent =
      aKeyEvent->WidgetEventPtr()->AsKeyboardEvent();
    if (!nativeKeyEvent) {
      return NS_OK;
    }

    RefPtr<KeyboardEvent> keyEvent = aKeyEvent->AsKeyboardEvent();
    uint32_t keyCode = keyEvent->KeyCode();

    // Cancel the access key flag unless we are pressing the access key.
    if (keyCode != (uint32_t)mAccessKey) {
      mAccessKeyDownCanceled = true;
    }

#ifndef XP_MACOSX
    // Need to handle F10 specially on Non-Mac platform.
    if (nativeKeyEvent->mMessage == eKeyPress && keyCode == NS_VK_F10) {
      if ((GetModifiersForAccessKey(keyEvent) & ~MODIFIER_CONTROL) == 0) {
        // If the keyboard event should activate the menubar and will be
        // sent to a remote process, it should be executed with reply
        // event from the focused remote process.  Note that if the menubar
        // is active, the event is already marked as "stop cross
        // process dispatching".  So, in that case, this won't wait
        // reply from the remote content.
        if (nativeKeyEvent->WillBeSentToRemoteProcess()) {
          nativeKeyEvent->StopImmediatePropagation();
          nativeKeyEvent->MarkAsWaitingReplyFromRemoteProcess();
          return NS_OK;
        }
        // The F10 key just went down by itself or with ctrl pressed.
        // In Windows, both of these activate the menu bar.
        mMenuBarFrame->SetActiveByKeyboard();
        ToggleMenuActiveState();

        if (mMenuBarFrame->IsActive()) {
#ifdef MOZ_WIDGET_GTK
          // In GTK, this also opens the first menu.
          mMenuBarFrame->GetCurrentMenuItem()->OpenMenu(false);
#endif
          aKeyEvent->StopPropagation();
          aKeyEvent->PreventDefault();
        }
      }

      return NS_OK;
    }
#endif // !XP_MACOSX

    nsMenuFrame* menuFrameForKey = GetMenuForKeyEvent(keyEvent, false);
    if (!menuFrameForKey) {
      return NS_OK;
    }

    // If the keyboard event matches with a menu item's accesskey and
    // will be sent to a remote process, it should be executed with
    // reply event from the focused remote process.  Note that if the
    // menubar is active, the event is already marked as "stop cross
    // process dispatching".  So, in that case, this won't wait
    // reply from the remote content.
    if (nativeKeyEvent->WillBeSentToRemoteProcess()) {
      nativeKeyEvent->StopImmediatePropagation();
      nativeKeyEvent->MarkAsWaitingReplyFromRemoteProcess();
      return NS_OK;
    }

    mMenuBarFrame->SetActiveByKeyboard();
    mMenuBarFrame->SetActive(true);
    menuFrameForKey->OpenMenu(true);

    // The opened menu will listen next keyup event.
    // Therefore, we should clear the keydown flags here.
    mAccessKeyDown = mAccessKeyDownCanceled = false;

    aKeyEvent->StopPropagation();
    aKeyEvent->PreventDefault();
  }

  return NS_OK;
}

bool
nsMenuBarListener::IsAccessKeyPressed(KeyboardEvent* aKeyEvent)
{
  InitAccessKey();
  // No other modifiers are allowed to be down except for Shift.
  uint32_t modifiers = GetModifiersForAccessKey(aKeyEvent);

  return (mAccessKeyMask != MODIFIER_SHIFT &&
          (modifiers & mAccessKeyMask) &&
          (modifiers & ~(mAccessKeyMask | MODIFIER_SHIFT)) == 0);
}

Modifiers
nsMenuBarListener::GetModifiersForAccessKey(KeyboardEvent* aKeyEvent)
{
  WidgetInputEvent* inputEvent =
    aKeyEvent->WidgetEventPtr()->AsInputEvent();
  MOZ_ASSERT(inputEvent);

  static const Modifiers kPossibleModifiersForAccessKey =
    (MODIFIER_SHIFT | MODIFIER_CONTROL | MODIFIER_ALT | MODIFIER_META |
     MODIFIER_OS);
  return (inputEvent->mModifiers & kPossibleModifiersForAccessKey);
}

nsMenuFrame*
nsMenuBarListener::GetMenuForKeyEvent(KeyboardEvent* aKeyEvent, bool aPeek)
{
  if (!IsAccessKeyPressed(aKeyEvent)) {
    return nullptr;
  }

  uint32_t charCode = aKeyEvent->CharCode();
  bool hasAccessKeyCandidates = charCode != 0;
  if (!hasAccessKeyCandidates) {
    WidgetKeyboardEvent* nativeKeyEvent =
      aKeyEvent->WidgetEventPtr()->AsKeyboardEvent();

    AutoTArray<uint32_t, 10> keys;
    nativeKeyEvent->GetAccessKeyCandidates(keys);
    hasAccessKeyCandidates = !keys.IsEmpty();
  }

  if (hasAccessKeyCandidates) {
    // Do shortcut navigation.
    // A letter was pressed. We want to see if a shortcut gets matched. If
    // so, we'll know the menu got activated.
    return mMenuBarFrame->FindMenuWithShortcut(aKeyEvent, aPeek);
  }

  return nullptr;
}

void
nsMenuBarListener::ReserveKeyIfNeeded(Event* aKeyEvent)
{
  WidgetKeyboardEvent* nativeKeyEvent =
    aKeyEvent->WidgetEventPtr()->AsKeyboardEvent();
  if (nsContentUtils::ShouldBlockReservedKeys(nativeKeyEvent)) {
    nativeKeyEvent->MarkAsReservedByChrome();
  }
}

////////////////////////////////////////////////////////////////////////
nsresult
nsMenuBarListener::KeyDown(Event* aKeyEvent)
{
  InitAccessKey();

  //handlers shouldn't be triggered by non-trusted events.
  if (!aKeyEvent || !aKeyEvent->IsTrusted()) {
    return NS_OK;
  }

  RefPtr<KeyboardEvent> keyEvent = aKeyEvent->AsKeyboardEvent();
  if (!keyEvent) {
    return NS_OK;
  }

  uint32_t theChar = keyEvent->KeyCode();

  uint16_t eventPhase = keyEvent->EventPhase();
  bool capturing = (eventPhase == dom::Event_Binding::CAPTURING_PHASE);

#ifndef XP_MACOSX
  if (capturing && !mAccessKeyDown && theChar == NS_VK_F10 &&
      (GetModifiersForAccessKey(keyEvent) & ~MODIFIER_CONTROL) == 0) {
    ReserveKeyIfNeeded(aKeyEvent);
  }
#endif

  if (mAccessKey && mAccessKeyFocuses)
  {
    bool defaultPrevented = aKeyEvent->DefaultPrevented();

    // No other modifiers can be down.
    // Especially CTRL.  CTRL+ALT == AltGR, and we'll fuck up on non-US
    // enhanced 102-key keyboards if we don't check this.
    bool isAccessKeyDownEvent =
      ((theChar == (uint32_t)mAccessKey) &&
       (GetModifiersForAccessKey(keyEvent) & ~mAccessKeyMask) == 0);

    if (!capturing && !mAccessKeyDown) {
      // If accesskey isn't being pressed and the key isn't the accesskey,
      // ignore the event.
      if (!isAccessKeyDownEvent) {
        return NS_OK;
      }

      // Otherwise, accept the accesskey state.
      mAccessKeyDown = true;
      // If default is prevented already, cancel the access key down.
      mAccessKeyDownCanceled = defaultPrevented;
      return NS_OK;
    }

    // If the pressed accesskey was canceled already or the event was
    // consumed already, ignore the event.
    if (mAccessKeyDownCanceled || defaultPrevented) {
      return NS_OK;
    }

    // Some key other than the access key just went down,
    // so we won't activate the menu bar when the access key is released.
    mAccessKeyDownCanceled = !isAccessKeyDownEvent;
  }

  if (capturing && mAccessKey) {
    nsMenuFrame* menuFrameForKey = GetMenuForKeyEvent(keyEvent, true);
    if (menuFrameForKey) {
      ReserveKeyIfNeeded(aKeyEvent);
    }
  }

  return NS_OK; // means I am NOT consuming event
}

////////////////////////////////////////////////////////////////////////

nsresult
nsMenuBarListener::Blur(Event* aEvent)
{
  if (!mMenuBarFrame->IsMenuOpen() && mMenuBarFrame->IsActive()) {
    ToggleMenuActiveState();
    mAccessKeyDown = false;
    mAccessKeyDownCanceled = false;
  }
  return NS_OK; // means I am NOT consuming event
}

////////////////////////////////////////////////////////////////////////

nsresult
nsMenuBarListener::OnWindowDeactivated(Event* aEvent)
{
  // Reset the accesskey state because we cannot receive the keyup event for
  // the pressing accesskey.
  mAccessKeyDown = false;
  mAccessKeyDownCanceled = false;
  return NS_OK; // means I am NOT consuming event
}

////////////////////////////////////////////////////////////////////////
nsresult
nsMenuBarListener::MouseDown(Event* aMouseEvent)
{
  // NOTE: MouseDown method listens all phases

  // Even if the mousedown event is canceled, it means the user don't want
  // to activate the menu.  Therefore, we need to record it at capturing (or
  // target) phase.
  if (mAccessKeyDown) {
    mAccessKeyDownCanceled = true;
  }

  // Don't do anything at capturing phase, any behavior should be cancelable.
  if (aMouseEvent->EventPhase() == dom::Event_Binding::CAPTURING_PHASE) {
    return NS_OK;
  }

  if (!mMenuBarFrame->IsMenuOpen() && mMenuBarFrame->IsActive())
    ToggleMenuActiveState();

  return NS_OK; // means I am NOT consuming event
}

////////////////////////////////////////////////////////////////////////

nsresult
nsMenuBarListener::Fullscreen(Event* aEvent)
{
  if (mMenuBarFrame->IsActive()) {
    ToggleMenuActiveState();
  }
  return NS_OK;
}

////////////////////////////////////////////////////////////////////////
nsresult
nsMenuBarListener::HandleEvent(Event* aEvent)
{
  // If the menu bar is collapsed, don't do anything.
  if (!mMenuBarFrame->StyleVisibility()->IsVisible()) {
    return NS_OK;
  }

  nsAutoString eventType;
  aEvent->GetType(eventType);

  if (eventType.EqualsLiteral("keyup")) {
    return KeyUp(aEvent);
  }
  if (eventType.EqualsLiteral("keydown")) {
    return KeyDown(aEvent);
  }
  if (eventType.EqualsLiteral("keypress")) {
    return KeyPress(aEvent);
  }
  if (eventType.EqualsLiteral("mozaccesskeynotfound")) {
    return KeyPress(aEvent);
  }
  if (eventType.EqualsLiteral("blur")) {
    return Blur(aEvent);
  }
  if (eventType.EqualsLiteral("deactivate")) {
    return OnWindowDeactivated(aEvent);
  }
  if (eventType.EqualsLiteral("mousedown")) {
    return MouseDown(aEvent);
  }
  if (eventType.EqualsLiteral("MozDOMFullscreen:Entered")) {
    return Fullscreen(aEvent);
  }

  MOZ_ASSERT_UNREACHABLE("Unexpected eventType");
  return NS_OK;
}