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// Copyright 2018 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 <string>
#include <unordered_map>
#include <vector>
#include "base/component_export.h"
#include "base/macros.h"
#include "base/optional.h"
#include "ui/base/clipboard/clipboard_buffer.h"
namespace ui {
// Allows Chrome controls and windows to exchange data with each other and other
// applications, e.g., to copy and paste.
// In environments that have multiple clipboards (like Linux X11 or OS X, see
// ui::ClipboardBuffer), the implementation should provide a separate data
// buffer for each system clipboard. When data is requested or offered, the
// caller specifies which buffer to use by providing the |buffer| parameter.
class COMPONENT_EXPORT(OZONE_BASE) PlatformClipboard {
virtual ~PlatformClipboard() {}
// DataMap is a map from "mime type" to associated data, whereas
// the data can be organized differently for each mime type.
using Data = std::vector<uint8_t>;
using DataMap = std::unordered_map<std::string, Data>;
// SequenceNumberUpdateCb is a repeating callback, which can be used to tell
// a client of the PlatformClipboard to increment clipboard's sequence number
using SequenceNumberUpdateCb =
base::RepeatingCallback<void(ClipboardBuffer buffer)>;
// Offers a given clipboard data 'data_map' to the host system clipboard.
// It is common that host clipboard implementations simply get offered
// the set of mime types available for the data being shared. In such cases,
// the actual clipboard data is only 'transferred' to the consuming
// application asynchronously, upon an explicit request for data given a
// specific mime type. This is the case of Wayland compositors and MacOS
// (NSPasteboard), for example.
// The invoker assumes the Ozone implementation will not free |DataMap|
// before |OfferDataClosure| is called.
// OfferDataClosure should be invoked when the host clipboard implementation
// acknowledges that the "offer to clipboard" operation is performed.
using OfferDataClosure = base::OnceCallback<void()>;
virtual void OfferClipboardData(ClipboardBuffer buffer,
const DataMap& data_map,
OfferDataClosure callback) = 0;
// Reads data from host system clipboard given mime type. The data is
// stored in 'data_map'.
// RequestDataClosure is invoked to acknowledge that the requested clipboard
// data has been read and stored into 'data_map'.
using RequestDataClosure =
base::OnceCallback<void(const base::Optional<std::vector<uint8_t>>&)>;
virtual void RequestClipboardData(ClipboardBuffer buffer,
const std::string& mime_type,
DataMap* data_map,
RequestDataClosure callback) = 0;
// Gets the mime types of the data available for clipboard operations
// in the host system clipboard.
// GetMimeTypesClosure is invoked when the mime types available for clipboard
// operations are known.
using GetMimeTypesClosure =
base::OnceCallback<void(const std::vector<std::string>&)>;
virtual void GetAvailableMimeTypes(ClipboardBuffer buffer,
GetMimeTypesClosure callback) = 0;
// Returns true if the current application writing data to the host clipboard
// data is this one; false otherwise.
// It can be relevant to know this information in case the client wants to
// caches the clipboard data, and wants to know if it is possible to use
// the cached data in order to reply faster to read-clipboard operations.
virtual bool IsSelectionOwner(ClipboardBuffer buffer) = 0;
// See comment above SequenceNumberUpdateCb. Can be called once.
virtual void SetSequenceNumberUpdateCb(SequenceNumberUpdateCb cb) = 0;
} // namespace ui