| // Copyright 2017 The Fuchsia 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 GARNET_LIB_UI_GFX_DISPLAYS_DISPLAY_WATCHER_H_ |
| #define GARNET_LIB_UI_GFX_DISPLAYS_DISPLAY_WATCHER_H_ |
| |
| #include <lib/fit/function.h> |
| #include <lib/fsl/io/device_watcher.h> |
| #include <memory> |
| #include <src/lib/fxl/macros.h> |
| |
| namespace scenic_impl { |
| namespace gfx { |
| |
| // Waits for a display device to be available, and returns the display |
| // attributes through a callback. |
| class DisplayWatcher { |
| public: |
| // Callback provides channels to the display controller device and FIDL |
| // interface. |
| using DisplayReadyCallback = |
| fit::function<void(zx::channel device, zx::channel controller)>; |
| |
| DisplayWatcher(); |
| ~DisplayWatcher(); |
| |
| // Waits for the display to become available then invokes the callback. |
| void WaitForDisplay(DisplayReadyCallback callback); |
| |
| private: |
| void HandleDevice(DisplayReadyCallback callback, int dir_fd, |
| std::string filename); |
| |
| std::unique_ptr<fsl::DeviceWatcher> device_watcher_; |
| |
| FXL_DISALLOW_COPY_AND_ASSIGN(DisplayWatcher); |
| }; |
| |
| } // namespace gfx |
| } // namespace scenic_impl |
| |
| #endif // GARNET_LIB_UI_GFX_DISPLAYS_DISPLAY_WATCHER_H_ |