ozone: evdev: Add libgestures bindings for touchpad & mouse support

ui/events/ozone/evdev/libgestures_glue/gesture_timer_provider.cc

+// 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.
+
+#include "ui/events/ozone/evdev/libgestures_glue/gesture_timer_provider.h"
+
+#include <gestures/gestures.h>
+
+#include "base/timer/timer.h"
+
+// libgestures requires that this be in the top level namespace.
+class GesturesTimer {
+ public:
+  GesturesTimer() : callback_(NULL), callback_data_(NULL) {}
+  ~GesturesTimer() {}
+
+  void Set(stime_t delay, GesturesTimerCallback callback, void* callback_data) {
+    callback_ = callback;
+    callback_data_ = callback_data;
+    timer_.Start(FROM_HERE,
+                 base::TimeDelta::FromMicroseconds(
+                     delay * base::Time::kMicrosecondsPerSecond),
+                 this,
+                 &GesturesTimer::OnTimerExpired);
+  }
+
+  void Cancel() { timer_.Stop(); }
+
+ private:
+  void OnTimerExpired() {
+    struct timespec ts;
+    CHECK(!clock_gettime(CLOCK_MONOTONIC, &ts));
+    stime_t next_delay = callback_(StimeFromTimespec(&ts), callback_data_);
+    if (next_delay >= 0) {
+      timer_.Start(FROM_HERE,
+                   base::TimeDelta::FromMicroseconds(
+                       next_delay * base::Time::kMicrosecondsPerSecond),
+                   this,
+                   &GesturesTimer::OnTimerExpired);
+    }
+  }
+
+  GesturesTimerCallback callback_;
+  void* callback_data_;
+  base::OneShotTimer<GesturesTimer> timer_;
+};
+
+namespace ui {
+
+namespace {
+
+GesturesTimer* GesturesTimerCreate(void* data) { return new GesturesTimer; }
+
+void GesturesTimerSet(void* data,
+                      GesturesTimer* timer,
+                      stime_t delay,
+                      GesturesTimerCallback callback,
+                      void* callback_data) {
+  timer->Set(delay, callback, callback_data);
+}
+
+void GesturesTimerCancel(void* data, GesturesTimer* timer) { timer->Cancel(); }
+
+void GesturesTimerFree(void* data, GesturesTimer* timer) { delete timer; }
+
+}  // namespace
+
+const GesturesTimerProvider kGestureTimerProvider = {
+    GesturesTimerCreate, GesturesTimerSet, GesturesTimerCancel,
+    GesturesTimerFree};
+
+}  // namespace ui