Quelle CloseWatcher.cpp Sprache: C

/* -*- 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 "CloseWatcher.h"

#include "mozilla/dom/CloseWatcherBinding.h"
#include "mozilla/dom/CloseWatcherManager.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/EventBinding.h"
#include "mozilla/dom/ToJSValue.h"
#include "mozilla/dom/WindowContext.h"
#include "mozilla/RefPtr.h"
#include "nsGlobalWindowInner.h"

namespace mozilla::dom {

NS_IMPL_ISUPPORTS_INHERITED0(CloseWatcher, DOMEventTargetHelper)

already_AddRefed<CloseWatcher> CloseWatcher::Constructor(
    const GlobalObject& aGlobal, const CloseWatcherOptions& aOptions,
    ErrorResult& aRv) {
  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
  RefPtr<nsPIDOMWindowInner> window = global->GetAsInnerWindow();
  if (!window || !window->IsFullyActive()) {
    aRv.ThrowInvalidStateError("The document is not fully active.");
    return nullptr;
  }

  RefPtr<CloseWatcher> watcher = new CloseWatcher(window);

  AbortSignal* signal = nullptr;
  if (aOptions.mSignal.WasPassed()) {
    signal = &aOptions.mSignal.Value();
  }
  if (signal && signal->Aborted()) {
    return watcher.forget();
  }
  if (signal) {
    watcher->Follow(signal);
  }

  auto* manager = window->EnsureCloseWatcherManager();
  manager->Add(*watcher);
  return watcher.forget();
}

JSObject* CloseWatcher::WrapObject(JSContext* aCx,
                                   JS::Handle<JSObject*> aGivenProto) {
  return CloseWatcher_Binding::Wrap(aCx, this, aGivenProto);
}

// https://html.spec.whatwg.org/multipage/interaction.html#close-watcher-request-close
bool CloseWatcher::RequestToClose() {
  // 1. If closeWatcher is not active, then return true.
  // 2. If closeWatcher's is running cancel action is true, then return true.
  // 3. Let window be closeWatcher's window.
  // 4. If window's associated Document is not fully active, then return true.
  if (!IsActive() || mIsRunningCancelAction) {
    return true;
  }
  MOZ_ASSERT(GetOwnerWindow());
  RefPtr<WindowContext> winCtx = GetOwnerWindow()->GetWindowContext();
  RefPtr<CloseWatcherManager> manager =
      GetOwnerWindow()->EnsureCloseWatcherManager();
  EventInit init;
  init.mBubbles = false;
  // 5. Let canPreventClose be true if window's close watcher manager's groups's
  // size is less than window's close watcher manager's allowed number of
  // groups, and window has history-action activation; otherwise false.
  init.mCancelable = manager->CanGrow() && winCtx->HasValidHistoryActivation();
  RefPtr<Event> event = Event::Constructor(this, u"cancel"_ns, init);
  event->SetTrusted(true);
  // 6. Set closeWatcher's is running cancel action to true.
  mIsRunningCancelAction = true;
  // 7. Let shouldContinue be the result of running closeWatcher's cancel action
  // given canPreventClose.
  DispatchEvent(*event);
  // 8. Set closeWatcher's is running cancel action to false.
  mIsRunningCancelAction = false;
  // 9. If shouldContinue is false, then:
  if (event->DefaultPrevented()) {
    // 9.2. Consume history-action user activation given window.
    winCtx->ConsumeHistoryActivation();
    // 9.3. Return false.
    return false;
  }
  // 10. Close closeWatcher.
  Close();
  // 11. Return true.
  return true;
}

// https://html.spec.whatwg.org/multipage/interaction.html#close-watcher-request-close
void CloseWatcher::Close() {
  // 1. If closeWatcher is not active, then return.
  // 2. If closeWatcher's window's associated Document is not fully active, then
  // return.
  if (!IsActive()) {
    return;
  }
  // 3. Destroy closeWatcher.
  Destroy();
  EventInit init;
  init.mBubbles = false;
  init.mCancelable = false;
  RefPtr<Event> event = Event::Constructor(this, u"close"_ns, init);
  event->SetTrusted(true);
  DispatchEvent(*event);
}

void CloseWatcher::Destroy() {
  if (auto* window = GetOwnerWindow()) {
    window->EnsureCloseWatcherManager()->Remove(*this);
  }
}

bool CloseWatcher::IsActive() const {
  if (auto* window = GetOwnerWindow()) {
    return window->IsFullyActive() &&
           window->EnsureCloseWatcherManager()->Contains(*this);
  }
  return false;
}

void CloseWatcher::RunAbortAlgorithm() { Destroy(); }

}  // namespace mozilla::dom

quality100%

¤ Dauer der Verarbeitung: 0.29 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.