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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 nsBaseClipboard_h__
#define nsBaseClipboard_h__
#include "mozilla/dom/PContent.h"
#include "mozilla/Logging.h"
#include "mozilla/MoveOnlyFunction.h"
#include "mozilla/Result.h"
#include "nsIClipboard.h"
#include "nsITransferable.h"
#include "nsCOMPtr.h"
static mozilla::LazyLogModule sWidgetClipboardLog("WidgetClipboard");
#define MOZ_CLIPBOARD_LOG(...) \
MOZ_LOG(sWidgetClipboardLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
#define MOZ_CLIPBOARD_LOG_ENABLED() \
MOZ_LOG_TEST(sWidgetClipboardLog, mozilla::LogLevel::Debug)
class nsITransferable;
class nsIClipboardOwner;
class nsIPrincipal;
class nsIWidget;
namespace mozilla::dom {
class WindowContext;
} // namespace mozilla::dom
/**
* A base clipboard class for all platform, so that they can share the same
* implementation.
*/
class nsBaseClipboard : public nsIClipboard {
public:
explicit nsBaseClipboard(
const mozilla::dom::ClipboardCapabilities& aClipboardCaps);
// nsISupports
NS_DECL_ISUPPORTS
// nsIClipboard
NS_IMETHOD SetData(nsITransferable* aTransferable, nsIClipboardOwner* aOwner,
int32_t aWhichClipboard) override final;
NS_IMETHOD AsyncSetData(int32_t aWhichClipboard,
nsIAsyncClipboardRequestCallback* aCallback,
nsIAsyncSetClipboardData** _retval) override final;
NS_IMETHOD GetData(nsITransferable* aTransferable,
int32_t aWhichClipboard) override final;
NS_IMETHOD AsyncGetData(
const nsTArray<nsCString>& aFlavorList, int32_t aWhichClipboard,
mozilla::dom::WindowContext* aRequestingWindowContext,
nsIPrincipal* aRequestingPrincipal,
nsIAsyncClipboardGetCallback* aCallback) override final;
NS_IMETHOD EmptyClipboard(int32_t aWhichClipboard) override final;
NS_IMETHOD HasDataMatchingFlavors(const nsTArray<nsCString>& aFlavorList,
int32_t aWhichClipboard,
bool* aOutResult) override final;
NS_IMETHOD IsClipboardTypeSupported(int32_t aWhichClipboard,
bool* aRetval) override final;
void AsyncGetDataInternal(const nsTArray<nsCString>& aFlavorList,
int32_t aClipboardType,
nsIAsyncClipboardGetCallback* aCallback);
using GetDataCallback = mozilla::MoveOnlyFunction<void(nsresult)>;
using HasMatchingFlavorsCallback = mozilla::MoveOnlyFunction<void(
mozilla::Result<nsTArray<nsCString>, nsresult>)>;
protected:
virtual ~nsBaseClipboard();
// Implement the native clipboard behavior.
NS_IMETHOD SetNativeClipboardData(nsITransferable* aTransferable,
int32_t aWhichClipboard) = 0;
NS_IMETHOD GetNativeClipboardData(nsITransferable* aTransferable,
int32_t aWhichClipboard) = 0;
virtual void AsyncGetNativeClipboardData(nsITransferable* aTransferable,
int32_t aWhichClipboard,
GetDataCallback&& aCallback);
virtual nsresult EmptyNativeClipboardData(int32_t aWhichClipboard) = 0;
virtual mozilla::Result<int32_t, nsresult> GetNativeClipboardSequenceNumber(
int32_t aWhichClipboard) = 0;
virtual mozilla::Result<bool, nsresult> HasNativeClipboardDataMatchingFlavors(
const nsTArray<nsCString>& aFlavorList, int32_t aWhichClipboard) = 0;
virtual void AsyncHasNativeClipboardDataMatchingFlavors(
const nsTArray<nsCString>& aFlavorList, int32_t aWhichClipboard,
HasMatchingFlavorsCallback&& aCallback);
void ClearClipboardCache(int32_t aClipboardType);
private:
void RejectPendingAsyncSetDataRequestIfAny(int32_t aClipboardType);
class AsyncSetClipboardData final : public nsIAsyncSetClipboardData {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIASYNCSETCLIPBOARDDATA
AsyncSetClipboardData(int32_t aClipboardType, nsBaseClipboard* aClipboard,
nsIAsyncClipboardRequestCallback* aCallback);
private:
virtual ~AsyncSetClipboardData() = default;
bool IsValid() const {
// If this request is no longer valid, the callback should be notified.
MOZ_ASSERT_IF(!mClipboard, !mCallback);
return !!mClipboard;
}
void MaybeNotifyCallback(nsresult aResult);
// The clipboard type defined in nsIClipboard.
int32_t mClipboardType;
// It is safe to use a raw pointer as it will be nullified (by calling
// NotifyCallback()) once nsBaseClipboard stops tracking us. This is
// also used to indicate whether this request is valid.
nsBaseClipboard* mClipboard;
// mCallback will be nullified once the callback is notified to ensure the
// callback is only notified once.
nsCOMPtr<nsIAsyncClipboardRequestCallback> mCallback;
};
class AsyncGetClipboardData final : public nsIAsyncGetClipboardData {
public:
AsyncGetClipboardData(int32_t aClipboardType, int32_t aSequenceNumber,
nsTArray<nsCString>&& aFlavors, bool aFromCache,
nsBaseClipboard* aClipboard);
NS_DECL_ISUPPORTS
NS_DECL_NSIASYNCGETCLIPBOARDDATA
private:
virtual ~AsyncGetClipboardData() = default;
bool IsValid();
// The clipboard type defined in nsIClipboard.
const int32_t mClipboardType;
// The sequence number associated with the clipboard content for this
// request. If it doesn't match with the current sequence number in system
// clipboard, this request targets stale data and is deemed invalid.
const int32_t mSequenceNumber;
// List of available data types for clipboard content.
const nsTArray<nsCString> mFlavors;
// Data should be read from cache.
const bool mFromCache;
// This is also used to indicate whether this request is still valid.
RefPtr<nsBaseClipboard> mClipboard;
};
class ClipboardCache final {
public:
~ClipboardCache() {
// In order to notify the old clipboard owner.
Clear();
}
/**
* Clear the cached transferable and notify the original clipboard owner
* that it has lost ownership.
*/
void Clear();
void Update(nsITransferable* aTransferable,
nsIClipboardOwner* aClipboardOwner, int32_t aSequenceNumber) {
// Clear first to notify the old clipboard owner.
Clear();
mTransferable = aTransferable;
mClipboardOwner = aClipboardOwner;
mSequenceNumber = aSequenceNumber;
}
nsITransferable* GetTransferable() const { return mTransferable; }
nsIClipboardOwner* GetClipboardOwner() const { return mClipboardOwner; }
int32_t GetSequenceNumber() const { return mSequenceNumber; }
nsresult GetData(nsITransferable* aTransferable) const;
private:
nsCOMPtr<nsITransferable> mTransferable;
nsCOMPtr<nsIClipboardOwner> mClipboardOwner;
int32_t mSequenceNumber = -1;
};
void MaybeRetryGetAvailableFlavors(const nsTArray<nsCString>& aFlavorList,
int32_t aWhichClipboard,
nsIAsyncClipboardGetCallback* aCallback,
int32_t aRetryCount);
// Return clipboard cache if the cached data is valid, otherwise clear the
// cached data and returns null.
ClipboardCache* GetClipboardCacheIfValid(int32_t aClipboardType);
mozilla::Result<nsTArray<nsCString>, nsresult> GetFlavorsFromClipboardCache(
int32_t aClipboardType);
nsresult GetDataFromClipboardCache(nsITransferable* aTransferable,
int32_t aClipboardType);
void RequestUserConfirmation(int32_t aClipboardType,
const nsTArray<nsCString>& aFlavorList,
mozilla::dom::WindowContext* aWindowContext,
nsIPrincipal* aRequestingPrincipal,
nsIAsyncClipboardGetCallback* aCallback);
// Track the pending request for each clipboard type separately. And only need
// to track the latest request for each clipboard type as the prior pending
// request will be canceled when a new request is made.
RefPtr<AsyncSetClipboardData>
mPendingWriteRequests[nsIClipboard::kClipboardTypeCount];
mozilla::UniquePtr<ClipboardCache> mCaches[nsIClipboard::kClipboardTypeCount];
const mozilla::dom::ClipboardCapabilities mClipboardCaps;
bool mIgnoreEmptyNotification = false;
};
#endif // nsBaseClipboard_h__