Event handling support for ozone.

ui/base/ozone/event_factory_ozone.cc

+// Copyright (c) 2013 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/base/ozone/event_factory_ozone.h"
+
+#include <fcntl.h>
+#include <linux/input.h>
+#include <poll.h>
+#include <unistd.h>
+
+#include "base/message_pump_ozone.h"
+#include "base/stringprintf.h"
+#include "ui/base/ozone/key_event_converter_ozone.h"
+#include "ui/base/ozone/touch_event_converter_ozone.h"
+
+namespace ui {
+
+EventFactoryOzone::EventFactoryOzone() {}
+
+EventFactoryOzone::~EventFactoryOzone() {
+  for (unsigned i = 0; i < fd_controllers_.size(); i++) {
+    fd_controllers_[i]->StopWatchingFileDescriptor();
+  }
+}
+
+void EventFactoryOzone::CreateEvdevWatchers() {
+  // The number of devices in the directory is unknown without reading
+  // the contents of the directory. Further, with hot-plugging,  the entries
+  // might decrease during the execution of this loop. So exciting from the
+  // loop on the first failure of open below is both cheaper and more
+  // reliable.
+  for (int id = 0; true; id++) {
+    std::string path = base::StringPrintf("/dev/input/event%d", id);
+    int fd = open(path.c_str(), O_RDONLY | O_NONBLOCK);
+    if (fd < 0)
+      break;
+    size_t evtype = 0;
+    COMPILE_ASSERT(sizeof(evtype) * 8 >= EV_MAX, evtype_wide_enough);
+    if (ioctl(fd, EVIOCGBIT(0, sizeof(evtype)), &evtype) == -1) {
+      DLOG(ERROR) << "failed ioctl EVIOCGBIT 0" << path;
+      close(fd);
+      continue;
+    }
+
+    EventConverterOzone* watcher = NULL;
+    // TODO(rjkroege) Add more device types. Support hot-plugging.
+    if (evtype & (1 << EV_ABS))
+      watcher = new TouchEventConverterOzone(fd, id);
+    else if (evtype & (1 << EV_KEY))
+      watcher = new KeyEventConverterOzone();
+
+    if (watcher) {
+      base::MessagePumpLibevent::FileDescriptorWatcher* controller =
+          new base::MessagePumpLibevent::FileDescriptorWatcher();
+      base::MessagePumpOzone::Current()->WatchFileDescriptor(
+          fd, true, base::MessagePumpLibevent::WATCH_READ, controller, watcher);
+      evdev_watchers_.push_back(watcher);
+      fd_controllers_.push_back(controller);
+    } else {
+      close(fd);
+    }
+  }
+}
+
+}  // namespace ui