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// Copyright 2014 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_DISPLAY_CHROMEOS_CONFIGURATION_TASK_H_
#define UI_DISPLAY_CHROMEOS_CONFIGURATION_TASK_H_
#include <stddef.h>
#include <queue>
#include <vector>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "ui/display/display_export.h"
#include "ui/gfx/geometry/point.h"
namespace ui {
class DisplayMode;
class DisplaySnapshot;
class NativeDisplayDelegate;
struct DISPLAY_EXPORT DisplayConfigureRequest {
DisplayConfigureRequest(DisplaySnapshot* display,
const DisplayMode* mode,
const gfx::Point& origin);
DisplaySnapshot* display;
const DisplayMode* mode;
gfx::Point origin;
};
// Applies the display configuration asynchronously.
class DISPLAY_EXPORT ConfigureDisplaysTask {
public:
enum Status {
// At least one of the displays failed to apply any mode it supports.
ERROR,
// The requested configuration was applied.
SUCCESS,
// At least one of the displays failed to apply the requested
// configuration, but it managed to fall back to another mode.
PARTIAL_SUCCESS,
};
typedef base::Callback<void(Status)> ResponseCallback;
ConfigureDisplaysTask(NativeDisplayDelegate* delegate,
const std::vector<DisplayConfigureRequest>& requests,
const ResponseCallback& callback);
~ConfigureDisplaysTask();
// Starts the configuration task.
void Run();
private:
void OnConfigured(size_t index, bool success);
NativeDisplayDelegate* delegate_; // Not owned.
std::vector<DisplayConfigureRequest> requests_;
// When the task finishes executing it runs the callback to notify that the
// task is done and the task status.
ResponseCallback callback_;
// Stores the indexes of pending requests in |requests_|.
std::queue<size_t> pending_request_indexes_;
// Used to keep make sure that synchronous executions do not recurse during
// the configuration.
bool is_configuring_;
// Number of display configured. This is used to check whether there are
// pending requests.
size_t num_displays_configured_;
Status task_status_;
base::WeakPtrFactory<ConfigureDisplaysTask> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ConfigureDisplaysTask);
};
} // namespace ui
#endif // UI_DISPLAY_CHROMEOS_CONFIGURATION_TASK_H_