touch: Allow grabbing/ungrabbing touch devices for XInput2.

views/touchui/touch_factory.cc

+// 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_(),

[sky, 2011/01/19 19:34:54]

put these on the next line and indented 4 spaces.

[sadrul, 2011/01/19 20:10:17]

Done.

+                               touch_device_list_() {
+}
+
+void TouchFactory::SetTouchDeviceList(
+    const std::vector<unsigned int>& devices) {
+  for (std::vector<unsigned int>::const_iterator iter = devices.begin();

[sky, 2011/01/19 19:34:54]

Do you need to clear out touch_device_lookup_ and touch_device_list_ before
entering the loop?

[sadrul, 2011/01/19 20:10:17]

At this moment, this is called exactly once. But resetting the list here sounds
like a good idea. Done.

+      iter != devices.end(); ++iter) {

[sky, 2011/01/19 19:34:54]

indent one more space

[sadrul, 2011/01/19 20:10:17]

Done.

+    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_.size() == 0)

[sky, 2011/01/19 19:34:54]

empty

[sadrul, 2011/01/19 20:10:17]

Done.

+    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