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// 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 {
public:
class Delegate;
explicit XDisplayManager(Delegate* delegate);
XDisplayManager(const XDisplayManager&) = delete;
XDisplayManager& operator=(const XDisplayManager&) = delete;
~XDisplayManager() override;
void Init();
bool IsXrandrAvailable() const;
void OnEvent(const x11::Event& xev);
void UpdateDisplayList();
void DispatchDelayedDisplayListUpdate();
const display::Display& GetPrimaryDisplay() const;
void AddObserver(display::DisplayObserver* observer);
void RemoveObserver(display::DisplayObserver* observer);
const std::vector<display::Display>& displays() const { return displays_; }
// Returns current workspace.
std::string GetCurrentWorkspace();
private:
friend class ui::X11ScreenOzoneTest;
friend class views::DesktopScreenX11Test;
void SetDisplayList(std::vector<display::Display> displays,
size_t primary_display_index);
void FetchDisplayList();
// X11WorkspaceHandler override:
void OnCurrentWorkspaceChanged(const std::string& new_workspace) override;
const raw_ptr<Delegate> delegate_;
std::vector<display::Display> displays_;
display::DisplayChangeNotifier change_notifier_;
const raw_ptr<x11::Connection> connection_;
x11::Window x_root_window_;
size_t primary_display_index_ = 0;
// The task which fetches/updates display list info asynchronously.
base::CancelableOnceClosure update_task_;
X11WorkspaceHandler workspace_handler_;
};
class COMPONENT_EXPORT(UI_BASE_X) XDisplayManager::Delegate {
public:
virtual ~Delegate() = default;
virtual void OnXDisplayListUpdated() = 0;
};
} // namespace ui
#endif // UI_BASE_X_X11_DISPLAY_MANAGER_H_
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