1 files changed, 132 insertions, 0 deletions
diff --git a/dom/events/ClipboardItem.h b/dom/events/ClipboardItem.h
new file mode 100644
index 0000000000..95fdcd6ea9
--- /dev/null
+++ b/dom/events/ClipboardItem.h
@@ -0,0 +1,132 @@
+/* -*- 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/. */
+
+#ifndef mozilla_dom_ClipboardItem_h_
+#define mozilla_dom_ClipboardItem_h_
+
+#include "mozilla/dom/Blob.h"
+#include "mozilla/dom/ClipboardBinding.h"
+#include "mozilla/dom/PromiseNativeHandler.h"
+#include "mozilla/MozPromise.h"
+
+#include "nsWrapperCache.h"
+
+class nsITransferable;
+
+namespace mozilla::dom {
+
+struct ClipboardItemOptions;
+template <typename KeyType, typename ValueType>
+class Record;
+class Promise;
+
+class ClipboardItem final : public nsWrapperCache {
+ public:
+  class ItemEntry final : public PromiseNativeHandler {
+   public:
+    using GetDataPromise =
+        MozPromise<OwningStringOrBlob, nsresult, /* IsExclusive = */ true>;
+
+    NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+    NS_DECL_CYCLE_COLLECTION_CLASS(ItemEntry)
+
+    explicit ItemEntry(nsIGlobalObject* aGlobal, const nsAString& aType)
+        : mGlobal(aGlobal), mType(aType) {
+      MOZ_ASSERT(mGlobal);
+    }
+    ItemEntry(nsIGlobalObject* aGlobal, const nsAString& aType,
+              const nsAString& aData)
+        : ItemEntry(aGlobal, aType) {
+      mLoadResult.emplace(NS_OK);
+      mData.SetAsString() = aData;
+    }
+
+    // PromiseNativeHandler
+    void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                          ErrorResult& aRv) override;
+    void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                          ErrorResult& aRv) override;
+
+    const nsString& Type() const { return mType; }
+    RefPtr<GetDataPromise> GetData();
+
+    //  Load data from system clipboard.
+    void LoadDataFromSystemClipboard(nsITransferable& aTransferable);
+    void LoadDataFromDataPromise(Promise& aDataPromise);
+
+    // If clipboard data is in the process of loading from either system
+    // clipboard or data promise, add `aPromise` to the pending list which will
+    // be resolved/rejected later when process is finished. Otherwise,
+    // resolve/reject `aPromise` based on cached result and data.
+    void ReactGetTypePromise(Promise& aPromise);
+
+   private:
+    ~ItemEntry() {
+      mLoadingPromise.DisconnectIfExists();
+      if (!mPendingGetDataRequests.IsEmpty()) {
+        RejectPendingPromises(NS_ERROR_FAILURE);
+      }
+    };
+
+    void MaybeResolveGetTypePromise(const OwningStringOrBlob& aData,
+                                    Promise& aPromise);
+    void MaybeResolvePendingPromises(OwningStringOrBlob&& aData);
+    void RejectPendingPromises(nsresult rv);
+
+    nsCOMPtr<nsIGlobalObject> mGlobal;
+
+    // MIME type of this entry.
+    nsString mType;
+
+    // Cache the loading result.
+    OwningStringOrBlob mData;
+    Maybe<nsresult> mLoadResult;
+
+    // Indicates if the data is still being loaded.
+    bool mIsLoadingData = false;
+    MozPromiseRequestHolder<GenericPromise> mLoadingPromise;
+
+    // Pending promises for data retrieval requests.
+    nsTArray<MozPromiseHolder<GetDataPromise>> mPendingGetDataRequests;
+    nsTArray<RefPtr<Promise>> mPendingGetTypeRequests;
+  };
+
+  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(ClipboardItem)
+  NS_DECL_CYCLE_COLLECTION_NATIVE_WRAPPERCACHE_CLASS(ClipboardItem)
+
+  ClipboardItem(nsISupports* aOwner, dom::PresentationStyle aPresentationStyle,
+                nsTArray<RefPtr<ItemEntry>>&& aItems);
+
+  static already_AddRefed<ClipboardItem> Constructor(
+      const GlobalObject& aGlobal,
+      const Record<nsString, OwningNonNull<Promise>>& aItems,
+      const ClipboardItemOptions& aOptions, ErrorResult& aRv);
+
+  dom::PresentationStyle PresentationStyle() const {
+    return mPresentationStyle;
+  };
+  void GetTypes(nsTArray<nsString>& aTypes) const;
+
+  already_AddRefed<Promise> GetType(const nsAString& aType, ErrorResult& aRv);
+
+  nsISupports* GetParentObject() const { return mOwner; }
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  const nsTArray<RefPtr<ItemEntry>>& Entries() const { return mItems; }
+
+ private:
+  ~ClipboardItem() = default;
+
+  nsCOMPtr<nsISupports> mOwner;
+  dom::PresentationStyle mPresentationStyle;
+  nsTArray<RefPtr<ItemEntry>> mItems;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_ClipboardItem_h_