132 lines
5.1 KiB
C++
132 lines
5.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_DataTransferItemList_h
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#define mozilla_dom_DataTransferItemList_h
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#include "mozilla/dom/DataTransfer.h"
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#include "mozilla/dom/DataTransferItem.h"
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#include "mozilla/dom/FileList.h"
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namespace mozilla {
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namespace dom {
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class DataTransferItem;
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class DataTransferItemList final : public nsISupports
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, public nsWrapperCache
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{
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(DataTransferItemList);
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DataTransferItemList(DataTransfer* aDataTransfer, bool aIsExternal)
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: mDataTransfer(aDataTransfer)
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, mIsExternal(aIsExternal)
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{
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MOZ_ASSERT(aDataTransfer);
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// We always allocate an index 0 in our DataTransferItemList. This is done
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// in order to maintain the invariants according to the spec. Mainly, within
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// the spec's list, there is intended to be a single copy of each mime type,
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// for string typed items. File typed items are allowed to have duplicates.
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// In the old moz* system, this was modeled by having multiple indexes, each
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// of which was independent. Files were fetched from all indexes, but
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// strings were only fetched from the first index. In order to maintain this
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// correlation and avoid breaking code with the new changes, index 0 is now
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// always present and used to store strings, and all file items are given
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// their own index starting at index 1.
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mIndexedItems.SetLength(1);
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}
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already_AddRefed<DataTransferItemList> Clone(DataTransfer* aDataTransfer) const;
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virtual JSObject* WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) override;
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uint32_t Length() const
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{
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return mItems.Length();
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};
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DataTransferItem* Add(const nsAString& aData, const nsAString& aType,
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nsIPrincipal& aSubjectPrincipal,
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ErrorResult& rv);
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DataTransferItem* Add(File& aData,
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nsIPrincipal& aSubjectPrincipal,
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ErrorResult& aRv);
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void Remove(uint32_t aIndex,
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nsIPrincipal& aSubjectPrincipal,
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ErrorResult& aRv);
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DataTransferItem* IndexedGetter(uint32_t aIndex, bool& aFound) const;
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DataTransfer* GetParentObject() const
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{
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return mDataTransfer;
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}
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void Clear(nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv);
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already_AddRefed<DataTransferItem>
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SetDataWithPrincipal(const nsAString& aType, nsIVariant* aData,
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uint32_t aIndex, nsIPrincipal* aPrincipal,
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bool aInsertOnly, bool aHidden, ErrorResult& aRv);
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already_AddRefed<FileList> Files(nsIPrincipal* aPrincipal);
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// Moz-style helper methods for interacting with the stored data
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void MozRemoveByTypeAt(const nsAString& aType, uint32_t aIndex,
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nsIPrincipal& aSubjectPrincipal,
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ErrorResult& aRv);
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DataTransferItem* MozItemByTypeAt(const nsAString& aType, uint32_t aIndex);
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const nsTArray<RefPtr<DataTransferItem>>* MozItemsAt(uint32_t aIndex);
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uint32_t MozItemCount() const;
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// Causes everything in indexes above 0 to shift down one index.
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void PopIndexZero();
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// Delete every item in the DataTransferItemList, without checking for
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// permissions or read-only status (for internal use only).
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void ClearAllItems();
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private:
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void ClearDataHelper(DataTransferItem* aItem, uint32_t aIndexHint,
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uint32_t aMozOffsetHint,
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nsIPrincipal& aSubjectPrincipal,
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ErrorResult& aRv);
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DataTransferItem* AppendNewItem(uint32_t aIndex, const nsAString& aType,
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nsIVariant* aData, nsIPrincipal* aPrincipal,
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bool aHidden);
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void RegenerateFiles();
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void GenerateFiles(FileList* aFiles, nsIPrincipal* aFilesPrincipal);
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~DataTransferItemList() {}
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RefPtr<DataTransfer> mDataTransfer;
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bool mIsExternal;
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RefPtr<FileList> mFiles;
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// The principal for which mFiles is cached
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nsCOMPtr<nsIPrincipal> mFilesPrincipal;
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// mItems is the list of items that corresponds to the spec concept of a
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// DataTransferItemList. That is, this is the thing the spec's indexed getter
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// operates on. The items in here are a subset of the items present in the
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// arrays that live in mIndexedItems.
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nsTArray<RefPtr<DataTransferItem>> mItems;
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// mIndexedItems represents all our items. For any given index, all items at
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// that index have different types in the GetType() sense. That means that
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// representing multiple items with the same type (e.g. multiple files)
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// requires using multiple indices.
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//
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// There is always a (possibly empty) list of items at index 0, so
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// mIndexedItems.Length() >= 1 at all times.
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nsTArray<nsTArray<RefPtr<DataTransferItem>>> mIndexedItems;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_DataTransferItemList_h
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