Keep the mouse cursor within desktop

ui/aura/monitor_change_observer_x11.cc

-// Copyright (c) 2012 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/aura/monitor_change_observer_x11.h"
-
-#include <algorithm>
-#include <map>
-#include <set>
-#include <vector>
-
-#include <X11/extensions/Xrandr.h>
-
-#include "base/message_pump_x.h"
-#include "base/stl_util.h"
-#include "ui/aura/env.h"
-#include "ui/aura/monitor.h"
-#include "ui/aura/monitor_manager.h"
-
-namespace aura {
-namespace {
-XRRModeInfo* FindMode(XRRScreenResources* screen_resources, XID current_mode) {
-  for (int m = 0; m < screen_resources->nmode; m++) {
-    XRRModeInfo *mode = &screen_resources->modes[m];
-    if (mode->id == current_mode)
-      return mode;
-  }
-  return NULL;
-}
-
-bool CompareMonitorY(const Monitor* lhs, const Monitor* rhs) {
-  return lhs->bounds().y() < rhs->bounds().y();
-}
-
-}  // namespace internal
-
-MonitorChangeObserverX11::MonitorChangeObserverX11()
-    : xdisplay_(base::MessagePumpX::GetDefaultXDisplay()),
-      x_root_window_(DefaultRootWindow(xdisplay_)),
-      xrandr_event_base_(0) {
-  XRRSelectInput(xdisplay_, x_root_window_, RRScreenChangeNotifyMask);
-  int error_base_ignored;
-  XRRQueryExtension(xdisplay_, &xrandr_event_base_, &error_base_ignored);
-  NotifyMonitorChange();
-}
-
-MonitorChangeObserverX11::~MonitorChangeObserverX11() {
-}
-
-bool MonitorChangeObserverX11::Dispatch(const XEvent* event) {
-  if (event->type - xrandr_event_base_ == RRScreenChangeNotify) {
-    NotifyMonitorChange();
-    return true;
-  }
-  return false;
-}
-
-void MonitorChangeObserverX11::NotifyMonitorChange() {
-  if (!MonitorManager::use_fullscreen_host_window())
-    return;  // Use the default monitor that monitor manager determined.
-
-  XRRScreenResources* screen_resources =
-      XRRGetScreenResources(xdisplay_, x_root_window_);
-  std::map<XID, XRRCrtcInfo*> crtc_info_map;
-
-  for (int c = 0; c < screen_resources->ncrtc; c++) {
-    XID crtc_id = screen_resources->crtcs[c];
-    XRRCrtcInfo *crtc_info =
-        XRRGetCrtcInfo(xdisplay_, screen_resources, crtc_id);
-    crtc_info_map[crtc_id] = crtc_info;
-  }
-
-  std::vector<const Monitor*> monitors;
-  std::set<int> y_coords;
-  for (int o = 0; o < screen_resources->noutput; o++) {
-    XRROutputInfo *output_info =
-        XRRGetOutputInfo(xdisplay_,
-                         screen_resources,
-                         screen_resources->outputs[o]);
-    if (output_info->connection != RR_Connected) {
-      XRRFreeOutputInfo(output_info);
-      continue;
-    }
-    XRRCrtcInfo* crtc_info = crtc_info_map[output_info->crtc];
-    if (!crtc_info) {
-      LOG(WARNING) << "Crtc not found for output";
-      continue;
-    }
-    XRRModeInfo* mode = FindMode(screen_resources, crtc_info->mode);
-    CHECK(mode);
-    // Mirrored monitors have the same y coordinates.
-    if (y_coords.find(crtc_info->y) != y_coords.end())
-      continue;
-    Monitor* monitor = new Monitor;
-    monitor->set_bounds(gfx::Rect(crtc_info->x, crtc_info->y,
-                                  mode->width, mode->height));
-    monitors.push_back(monitor);
-    y_coords.insert(crtc_info->y);
-    XRRFreeOutputInfo(output_info);
-  }
-
-  // Free all allocated resources.
-  for (std::map<XID, XRRCrtcInfo*>::const_iterator iter = crtc_info_map.begin();
-       iter != crtc_info_map.end(); ++iter) {
-    XRRFreeCrtcInfo(iter->second);
-  }
-  XRRFreeScreenResources(screen_resources);
-
-  // PowerManager lays out the outputs vertically. Sort them by Y
-  // coordinates.
-  std::sort(monitors.begin(), monitors.end(), CompareMonitorY);
-  aura::Env::GetInstance()->monitor_manager()
-      ->OnNativeMonitorsChanged(monitors);
-  STLDeleteContainerPointers(monitors.begin(), monitors.end());
-}
-
-}  // namespace aura