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/* -*- 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_DataTransferItemList_h
#define mozilla_dom_DataTransferItemList_h
#include "mozilla/dom/DataTransfer.h"
#include "mozilla/dom/DataTransferItem.h"
#include "mozilla/dom/FileList.h"
class nsIVariant;
namespace mozilla::dom {
class DataTransfer;
class DataTransferItem;
class DataTransferItemList final : public nsISupports, public nsWrapperCache {
public:
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(DataTransferItemList);
explicit DataTransferItemList(DataTransfer* aDataTransfer)
: mDataTransfer(aDataTransfer) {
MOZ_ASSERT(aDataTransfer);
// We always allocate an index 0 in our DataTransferItemList. This is done
// in order to maintain the invariants according to the spec. Mainly, within
// the spec's list, there is intended to be a single copy of each mime type,
// for string typed items. File typed items are allowed to have duplicates.
// In the old moz* system, this was modeled by having multiple indexes, each
// of which was independent. Files were fetched from all indexes, but
// strings were only fetched from the first index. In order to maintain this
// correlation and avoid breaking code with the new changes, index 0 is now
// always present and used to store strings, and all file items are given
// their own index starting at index 1.
mIndexedItems.SetLength(1);
}
already_AddRefed<DataTransferItemList> Clone(
DataTransfer* aDataTransfer) const;
virtual JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) override;
uint32_t Length() const { return mItems.Length(); };
DataTransferItem* Add(const nsAString& aData, const nsAString& aType,
nsIPrincipal& aSubjectPrincipal, ErrorResult& rv);
DataTransferItem* Add(File& aData, nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv);
void Remove(uint32_t aIndex, nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv);
DataTransferItem* IndexedGetter(uint32_t aIndex, bool& aFound) const;
DataTransfer* GetParentObject() const { return mDataTransfer; }
void Clear(nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv);
// @param aHidden true, iff the item should be hidden from non-chrome code.
already_AddRefed<DataTransferItem> SetDataWithPrincipal(
const nsAString& aType, nsIVariant* aData, uint32_t aIndex,
nsIPrincipal* aPrincipal, bool aInsertOnly, bool aHidden,
ErrorResult& aRv);
already_AddRefed<FileList> Files(nsIPrincipal* aPrincipal);
// Moz-style helper methods for interacting with the stored data
void MozRemoveByTypeAt(const nsAString& aType, uint32_t aIndex,
nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv);
DataTransferItem* MozItemByTypeAt(const nsAString& aType, uint32_t aIndex);
const nsTArray<RefPtr<DataTransferItem>>* MozItemsAt(uint32_t aIndex);
uint32_t MozItemCount() const;
// Causes everything in indexes above 0 to shift down one index.
void PopIndexZero();
// Delete every item in the DataTransferItemList, without checking for
// permissions or read-only status (for internal use only).
void ClearAllItems();
void GetTypes(nsTArray<nsString>& aTypes, CallerType aCallerType) const;
bool HasType(const nsAString& aType) const;
bool HasFile() const;
private:
void ClearDataHelper(DataTransferItem* aItem, uint32_t aIndexHint,
uint32_t aMozOffsetHint, nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv);
// @param aHidden true, iff the item should be hidden from non-chrome code.
DataTransferItem* AppendNewItem(uint32_t aIndex, const nsAString& aType,
nsIVariant* aData, nsIPrincipal* aPrincipal,
bool aHidden);
void RegenerateFiles();
void GenerateFiles(FileList* aFiles, nsIPrincipal* aFilesPrincipal);
~DataTransferItemList() = default;
RefPtr<DataTransfer> mDataTransfer;
RefPtr<FileList> mFiles;
// The principal for which mFiles is cached
nsCOMPtr<nsIPrincipal> mFilesPrincipal;
// mItems is the list of items that corresponds to the spec concept of a
// DataTransferItemList. That is, this is the thing the spec's indexed getter
// operates on. The items in here are a subset of the items present in the
// arrays that live in mIndexedItems.
nsTArray<RefPtr<DataTransferItem>> mItems;
// mIndexedItems represents all our items. For any given index, all items at
// that index have different types in the GetType() sense. That means that
// representing multiple items with the same type (e.g. multiple files)
// requires using multiple indices.
//
// There is always a (possibly empty) list of items at index 0, so
// mIndexedItems.Length() >= 1 at all times.
nsTArray<nsTArray<RefPtr<DataTransferItem>>> mIndexedItems;
};
} // namespace mozilla::dom
#endif // mozilla_dom_DataTransferItemList_h
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