chromium/src/third_party/blink/renderer/modules/delegated_ink/ink.cc

// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/renderer/modules/delegated_ink/ink.h"

#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/frame/navigator.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"

namespace blink {

const char Ink::kSupplementName[] = "Ink";

Ink* Ink::ink(Navigator& navigator) {
  DCHECK(RuntimeEnabledFeatures::DelegatedInkTrailsEnabled());
  Ink* ink = Supplement<Navigator>::From<Ink>(navigator);
  if (!ink) {
    ink = MakeGarbageCollected<Ink>(navigator);
    ProvideTo(navigator, ink);
  }
  return ink;
}

Ink::Ink(Navigator& navigator) : Supplement<Navigator>(navigator) {}

ScriptPromise Ink::requestPresenter(ScriptState* state,
                                    String type,
                                    Element* presentationArea) {
  DCHECK(RuntimeEnabledFeatures::DelegatedInkTrailsEnabled());
  DCHECK_EQ(type, "delegated-ink-trail");

  auto* resolver = MakeGarbageCollected<ScriptPromiseResolver>(state);
  ScriptPromise promise = resolver->Promise();

  if (!state->ContextIsValid()) {
    resolver->Reject(V8ThrowException::CreateError(
        state->GetIsolate(),
        "The object is no longer associated with a window."));
    return promise;
  }

  if (type != "delegated-ink-trail") {
    resolver->Reject(V8ThrowException::CreateTypeError(
        state->GetIsolate(), "Unknown type requested."));
    return promise;
  }

  DelegatedInkTrailPresenter* trail_presenter =
      DelegatedInkTrailPresenter::CreatePresenter(
          presentationArea, GetSupplementable()->DomWindow()->GetFrame());

  resolver->Resolve(trail_presenter);
  return promise;
}

void Ink::Trace(Visitor* visitor) const {
  ScriptWrappable::Trace(visitor);
  Supplement<Navigator>::Trace(visitor);
}

}  // namespace blink