chromium/ui/base/x/x11_display_manager.h

// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_BASE_X_X11_DISPLAY_MANAGER_H_
#define UI_BASE_X_X11_DISPLAY_MANAGER_H_

#include <memory>
#include <vector>

#include "base/cancelable_callback.h"
#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
#include "ui/base/x/x11_workspace_handler.h"
#include "ui/display/display.h"
#include "ui/display/display_change_notifier.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/x/event.h"

namespace views {
class DesktopScreenX11Test;
}

namespace ui {
class X11ScreenOzoneTest;

////////////////////////////////////////////////////////////////////////////////
// XDisplayManager class
//
// Responsible for fetching and maintaining list of |display::Display|s
// representing X11 screens connected to the system. XRandR extension is used
// when version >= 1.3 is available, otherwise it falls back to
// |DefaultScreenOfDisplay| Xlib API.
//
// Scale Factor information and simple hooks are delegated to API clients
// through |XDisplayManager::Delegate| interface. To get notifications about
// dynamic display changes, clients must register |DisplayObserver| instances
// and feed |XDisplayManager| with |x11::Event|s.
//
// All bounds and size values are assumed to be expressed in pixels.
class COMPONENT_EXPORT(UI_BASE_X) XDisplayManager
    : public X11WorkspaceHandler::Delegate { … };

class COMPONENT_EXPORT(UI_BASE_X) XDisplayManager::Delegate { … };

}  // namespace ui

#endif  // UI_BASE_X_X11_DISPLAY_MANAGER_H_