Adding a Wayland basic toolkit

ui/wayland/wayland_input_device.h

+// Copyright (c) 2011 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 WAYLAND_INPUT_DEVICE_H_
+#define WAYLAND_INPUT_DEVICE_H_
+
+#include <stdint.h>
+
+#include "base/basictypes.h"
+#include "wayland_geometry_utils.h"
+#include "wayland_widget.h"
+
+struct xkb_desc;
+struct wl_array;
+struct wl_buffer;
+struct wl_display;
+struct wl_input_device;
+struct wl_input_device_listener;
+struct wl_surface;
+
+class WaylandWindow;
+
+/*
+This class represents an input device that was registered with Wayland.
+The purpose of this class is to parse and wrap events into generic
+WaylandEvent types and dispatch the event to the appropriate WaylandWindow.
+
+How Wayland events work:
+------------------------
+
+When the On*Focus events are triggered, the input device receives a reference
+to the surface that just received/lost focus. Each surface is associated with
+a unique WaylandWindow. When processing the focus events we keep track of the
+currently focused window such that when we receive different events (mouse
+button press or key press) we only send the event to the window in focus.
+*/
+class WaylandInputDevice {
+
+ public:
+  WaylandInputDevice(wl_display* display, uint32_t id);
+  ~WaylandInputDevice();
+
+  // Used to change the surface of the input device (normally pointer image).
+  void Attach(wl_buffer* buffer, int32_t x, int32_t y);
+ private:
+  wl_input_device* input_device_;
+
+  /* These keep track of the window that's currently under focus. NULL if no
+  window is under focus.
+  */
+  WaylandWindow* pointer_focus_;
+  WaylandWindow* keyboard_focus_;
+
+  /* Keeps track of the currently active keyboard modifiers. We keep this
+  since we want to advertise keyboard modifiers with mouse events.
+  */
+  uint32_t keyboard_modifiers_;
+
+  /* Keeps track of the last position for the motion event. We want to
+  publish this with events such as button notify which doesn't have a
+  position associated by default.
+  */
+  Point global_position_;
+  Point surface_position_;
+
+  /* Keep track of the time of last event. Useful when we get buffer Attach
+  calls and the calls wouldn't have a way of getting an event time.
+  */
+  uint32_t last_event_time_;
+
+  /* keymap used to transform keyboard events. */
+  xkb_desc* xkb_;
+
+  /* List of callback functions for input device events. */
+  static const wl_input_device_listener input_device_listener_;
+
+  /* Input device callback functions. These will create 'WaylandEvent's and
+  send them to the currently focused window.
+  Args:
+    - data: Pointer to the WaylandInputDevice object associated with the
+            'input_device'
+    - input_device:
+            The input device that sent the event
+    - time: The time of the event.
+  */
+  static void OnMotionNotify(void* data, wl_input_device* input_device,
+                             uint32_t time, int32_t x, int32_t y,
+                             int32_t sx, int32_t sy);
+  static void OnButtonNotify(void* data, wl_input_device* input_device,
+                             uint32_t time, uint32_t button, uint32_t state);
+  static void OnKeyNotify(void* data, wl_input_device* input_device,
+                          uint32_t time, uint32_t key, uint32_t state);
+  /* On*Focus events also have a Wayland surface associated with them. If the
+  surface is NULL, then the event signifies a loss of focus. Otherwise we
+  use the surface to get the WaylandWindow that receives focus.
+  */
+  static void OnPointerFocus(void* data, wl_input_device* input_device,
+                             uint32_t time, wl_surface *surface,
+                             int32_t x, int32_t y, int32_t sx, int32_t sy);
+  static void OnKeyboardFocus(void* data, wl_input_device* input_device,
+                              uint32_t time, wl_surface *surface,
+                              wl_array* keys);
+
+  DISALLOW_COPY_AND_ASSIGN(WaylandInputDevice);
+};
+
+#endif