2 files changed, 144 insertions, 0 deletions
diff --git a/views/touchui/touch_factory.cc b/views/touchui/touch_factory.cc
new file mode 100644
index 0000000..8608782
--- /dev/null
+++ b/views/touchui/touch_factory.cc
@@ -0,0 +1,79 @@
+// 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.
+
+#include "views/touchui/touch_factory.h"
+
+#include <gdk/gdkx.h>
+#include <X11/extensions/XInput2.h>
+
+#include "base/logging.h"
+
+namespace views {
+
+// static
+TouchFactory* TouchFactory::GetInstance() {
+  return Singleton<TouchFactory>::get();
+}
+
+TouchFactory::TouchFactory()
+    : touch_device_lookup_(),
+      touch_device_list_() {
+}
+
+void TouchFactory::SetTouchDeviceList(
+    const std::vector<unsigned int>& devices) {
+  touch_device_lookup_.reset();
+  touch_device_list_.clear();
+  for (std::vector<unsigned int>::const_iterator iter = devices.begin();
+       iter != devices.end(); ++iter) {
+    DCHECK(*iter < touch_device_lookup_.size());
+    touch_device_lookup_[*iter] = true;
+    touch_device_list_.push_back(*iter);
+  }
+}
+
+bool TouchFactory::IsTouchDevice(unsigned deviceid) {
+  return deviceid < touch_device_lookup_.size() ?
+      touch_device_lookup_[deviceid] : false;
+}
+
+bool TouchFactory::GrabTouchDevices(Display* display, ::Window window) {
+  if (touch_device_list_.empty())
+    return true;
+
+  unsigned char mask[(XI_LASTEVENT + 7) / 8];
+  bool success = true;
+
+  memset(mask, 0, sizeof(mask));
+  XISetMask(mask, XI_ButtonPress);
+  XISetMask(mask, XI_ButtonRelease);
+  XISetMask(mask, XI_Motion);
+
+  XIEventMask evmask;
+  evmask.mask_len = sizeof(mask);
+  evmask.mask = mask;
+  for (std::vector<int>::const_iterator iter =
+       touch_device_list_.begin();
+       iter != touch_device_list_.end(); ++iter) {
+    evmask.deviceid = *iter;
+    Status status = XIGrabDevice(display, *iter, window, CurrentTime, None,
+                                 GrabModeAsync, GrabModeAsync, False, &evmask);
+    success = success && status == GrabSuccess;
+  }
+
+  return success;
+}
+
+bool TouchFactory::UngrabTouchDevices(Display* display) {
+  bool success = true;
+  for (std::vector<int>::const_iterator iter =
+       touch_device_list_.begin();
+       iter != touch_device_list_.end(); ++iter) {
+    Status status = XIUngrabDevice(display, *iter, CurrentTime);
+    success = success && status == GrabSuccess;
+  }
+  return success;
+}
+
+}  // namespace views
diff --git a/views/touchui/touch_factory.h b/views/touchui/touch_factory.h
new file mode 100644
index 0000000..04114be
--- /dev/null
+++ b/views/touchui/touch_factory.h
@@ -0,0 +1,65 @@
+// 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 VIEWS_TOUCHUI_TOUCH_FACTORY_H_
+#define VIEWS_TOUCHUI_TOUCH_FACTORY_H_
+#pragma once
+
+#include <bitset>
+#include <vector>
+
+#include "base/singleton.h"
+
+typedef unsigned long Window;
+typedef struct _XDisplay Display;
+
+namespace views {
+
+// Functions related to determining touch devices.
+class TouchFactory {
+ public:
+  // Returns the TouchFactory singleton.
+  static TouchFactory* GetInstance();
+
+  // Keep a list of touch devices so that it is possible to determine if a
+  // pointer event is a touch-event or a mouse-event. The list is reset each
+  // time this is called.
+  void SetTouchDeviceList(const std::vector<unsigned int>& devices);
+
+  // Is the device a touch-device?
+  bool IsTouchDevice(unsigned int deviceid);
+
+  // Grab the touch devices for the specified window on the specified display.
+  // Returns if grab was successful for all touch devices.
+  bool GrabTouchDevices(Display* display, ::Window window);
+
+  // Ungrab the touch devices. Returns if ungrab was successful for all touch
+  // devices.
+  bool UngrabTouchDevices(Display* display);
+
+ private:
+  TouchFactory();
+
+  // Requirement for Signleton
+  friend struct DefaultSingletonTraits<TouchFactory>;
+
+  // NOTE: To keep track of touch devices, we currently maintain a lookup table
+  // to quickly decide if a device is a touch device or not. We also maintain a
+  // list of the touch devices. Ideally, there will be only one touch device,
+  // and instead of having the lookup table and the list, there will be a single
+  // identifier for the touch device. This can be completed after enough testing
+  // on real touch devices.
+
+  // A quick lookup table for determining if a device is a touch device.
+  std::bitset<128> touch_device_lookup_;
+
+  // The list of touch devices.
+  std::vector<int> touch_device_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(TouchFactory);
+};
+
+}  // namespace views
+
+#endif  // VIEWS_TOUCHUI_TOUCH_FACTORY_H_