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// Copyright (c) 2013 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 UI_BASE_X_SELECTION_REQUESTOR_H_
#define UI_BASE_X_SELECTION_REQUESTOR_H_
#include <X11/Xlib.h>
// Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
#undef RootWindow
#include <vector>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/memory/ref_counted_memory.h"
#include "ui/base/ui_export.h"
#include "ui/gfx/x/x11_atom_cache.h"
namespace ui {
class SelectionData;
// Requests and later receives data from the X11 server through the selection
// system.
//
// X11 uses a system called "selections" to implement clipboards and drag and
// drop. This class interprets messages from the statefull selection request
// API. SelectionRequestor should only deal with the X11 details; it does not
// implement per-component fast-paths.
class UI_EXPORT SelectionRequestor {
public:
SelectionRequestor(Display* xdisplay,
::Window xwindow,
::Atom selection_name);
~SelectionRequestor();
// Does the work of requesting |target| from the selection we handle,
// spinning up the nested message loop, and reading the resulting data
// back. |out_data| is allocated with the X allocator and must be freed with
// XFree(). |out_data_bytes| is the length in machine chars, while
// |out_data_items| is the length in |out_type| items.
bool PerformBlockingConvertSelection(
::Atom target,
scoped_refptr<base::RefCountedMemory>* out_data,
size_t* out_data_bytes,
size_t* out_data_items,
::Atom* out_type);
// Returns the first of |types| offered by the current selection holder, or
// returns NULL if none of those types are available.
SelectionData RequestAndWaitForTypes(const std::vector< ::Atom>& types);
// It is our owner's responsibility to plumb X11 SelectionNotify events on
// |xwindow_| to us.
void OnSelectionNotify(const XSelectionEvent& event);
private:
// Our X11 state.
Display* x_display_;
::Window x_window_;
// True if we're currently running a nested message loop, waiting for data to
// come back from the X server.
bool in_nested_loop_;
// The X11 selection that this instance communicates on.
::Atom selection_name_;
// Data to the current XConvertSelection request. Used for error detection;
// we verify it on the return message.
::Atom current_target_;
// The property in the returning SelectNotify message is used to signal
// success. If None, our request failed somehow. If equal to the property
// atom that we sent in the XConvertSelection call, we can read that property
// on |x_window_| for the requested data.
::Atom returned_property_;
// Called to terminate the nested message loop.
base::Closure quit_closure_;
X11AtomCache atom_cache_;
DISALLOW_COPY_AND_ASSIGN(SelectionRequestor);
};
} // namespace ui
#endif // UI_BASE_X_SELECTION_REQUESTOR_H_
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