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// Copyright (c) 2009 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.
#ifndef APP_OS_EXCHANGE_DATA_H_
#define APP_OS_EXCHANGE_DATA_H_
#include "build/build_config.h"
#include <set>
#include <string>
#include <vector>
#if defined(OS_WIN)
#include <objidl.h>
#elif defined(OS_LINUX)
#include <gtk/gtk.h>
#endif
#include "base/basictypes.h"
#include "base/scoped_ptr.h"
class GURL;
class Pickle;
///////////////////////////////////////////////////////////////////////////////
//
// OSExchangeData
// An object that holds interchange data to be sent out to OS services like
// clipboard, drag and drop, etc. This object exposes an API that clients can
// use to specify raw data and its high level type. This object takes care of
// translating that into something the OS can understand.
//
///////////////////////////////////////////////////////////////////////////////
class OSExchangeData {
public:
// CustomFormats are used for non-standard data types. For example, bookmark
// nodes are written using a CustomFormat.
#if defined(OS_WIN)
typedef CLIPFORMAT CustomFormat;
#elif defined(OS_LINUX)
typedef GdkAtom CustomFormat;
#endif
// Enumeration of the known formats.
enum Format {
STRING = 1 << 0,
URL = 1 << 1,
FILE_CONTENTS = 1 << 2,
FILE_NAME = 1 << 3,
PICKLED_DATA = 1 << 4,
HTML = 1 << 5
};
// Provider defines the platform specific part of OSExchangeData that
// interacts with the native system.
class Provider {
public:
Provider() {}
virtual ~Provider() {}
virtual void SetString(const std::wstring& data) = 0;
virtual void SetURL(const GURL& url, const std::wstring& title) = 0;
virtual void SetFilename(const std::wstring& full_path) = 0;
virtual void SetPickledData(CustomFormat format, const Pickle& data) = 0;
virtual void SetFileContents(const std::wstring& filename,
const std::string& file_contents) = 0;
virtual void SetHtml(const std::wstring& html, const GURL& base_url) = 0;
virtual bool GetString(std::wstring* data) const = 0;
virtual bool GetURLAndTitle(GURL* url, std::wstring* title) const = 0;
virtual bool GetFilename(std::wstring* full_path) const = 0;
virtual bool GetPickledData(CustomFormat format, Pickle* data) const = 0;
virtual bool GetFileContents(std::wstring* filename,
std::string* file_contents) const = 0;
virtual bool GetHtml(std::wstring* html, GURL* base_url) const = 0;
virtual bool HasString() const = 0;
virtual bool HasURL() const = 0;
virtual bool HasFile() const = 0;
virtual bool HasFileContents() const = 0;
virtual bool HasHtml() const = 0;
virtual bool HasCustomFormat(
OSExchangeData::CustomFormat format) const = 0;
};
OSExchangeData();
// Creates an OSExchangeData with the specified provider. OSExchangeData
// takes ownership of the supplied provider.
explicit OSExchangeData(Provider* provider);
~OSExchangeData();
// Registers the specific string as a possible format for data.
static CustomFormat RegisterCustomFormat(const std::string& type);
// Returns the Provider, which actually stores and manages the data.
const Provider& provider() const { return *provider_; }
Provider& provider() { return *provider_; }
// These functions add data to the OSExchangeData object of various Chrome
// types. The OSExchangeData object takes care of translating the data into
// a format suitable for exchange with the OS.
// NOTE WELL: Typically, a data object like this will contain only one of the
// following types of data. In cases where more data is held, the
// order in which these functions are called is _important_!
// ---> The order types are added to an OSExchangeData object controls
// the order of enumeration in our IEnumFORMATETC implementation!
// This comes into play when selecting the best (most preferable)
// data type for insertion into a DropTarget.
void SetString(const std::wstring& data);
// A URL can have an optional title in some exchange formats.
void SetURL(const GURL& url, const std::wstring& title);
// A full path to a file
void SetFilename(const std::wstring& full_path);
// Adds pickled data of the specified format.
void SetPickledData(CustomFormat format, const Pickle& data);
// Adds the bytes of a file (CFSTR_FILECONTENTS and CFSTR_FILEDESCRIPTOR).
void SetFileContents(const std::wstring& filename,
const std::string& file_contents);
// Adds a snippet of HTML. |html| is just raw html but this sets both
// text/html and CF_HTML.
void SetHtml(const std::wstring& html, const GURL& base_url);
// These functions retrieve data of the specified type. If data exists, the
// functions return and the result is in the out parameter. If the data does
// not exist, the out parameter is not touched. The out parameter cannot be
// NULL.
bool GetString(std::wstring* data) const;
bool GetURLAndTitle(GURL* url, std::wstring* title) const;
// Return the path of a file, if available.
bool GetFilename(std::wstring* full_path) const;
bool GetPickledData(CustomFormat format, Pickle* data) const;
bool GetFileContents(std::wstring* filename,
std::string* file_contents) const;
bool GetHtml(std::wstring* html, GURL* base_url) const;
// Test whether or not data of certain types is present, without actually
// returning anything.
bool HasString() const;
bool HasURL() const;
bool HasFile() const;
bool HasCustomFormat(CustomFormat format) const;
// Returns true if this OSExchangeData has data for ALL the formats in
// |formats| and ALL the custom formats in |custom_formats|.
bool HasAllFormats(int formats,
const std::set<CustomFormat>& custom_formats) const;
// Returns true if this OSExchangeData has data in any of the formats in
// |formats| or any custom format in |custom_formats|.
bool HasAnyFormat(int formats,
const std::set<CustomFormat>& custom_formats) const;
private:
// Creates the platform specific Provider.
static Provider* CreateProvider();
// Provides the actual data.
scoped_ptr<Provider> provider_;
DISALLOW_COPY_AND_ASSIGN(OSExchangeData);
};
#endif // APP_OS_EXCHANGE_DATA_H_
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