Refactor screen/monitor so that gfx::Screen returns monitor object.

ui/gfx/screen_aura.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/gfx/screen.h"
+
+#include "base/logging.h"
+#include "ui/gfx/monitor.h"
+#include "ui/gfx/native_widget_types.h"
+#include "ui/gfx/screen_impl.h"
+
+namespace gfx {
+
+// gfx can't depend upon aura, otherwise we have circular dependencies. So,
+// gfx::Screen is pluggable and Desktop plugs in the real implementation.
+namespace {
+ScreenImpl* g_instance_ = NULL;
+
+// TODO(erg): Figure out what to do about the Screen class. For now, I've
+// added default values for when a Screen instance class isn't passed in, but
+// this is the wrong thing.
+const Monitor* GetDefaultMonitor() {
+  static SimpleMonitor* default_monitor =
+      new SimpleMonitor(gfx::Rect(0, 0, 800, 800));
+  return default_monitor;
+};
+
+}
+
+// static
+void Screen::SetInstance(ScreenImpl* screen) {
+  delete g_instance_;
+  g_instance_ = screen;
+}
+
+// static
+gfx::Point Screen::GetCursorScreenPoint() {
+  if (!g_instance_)
+    return gfx::Point();
+  return g_instance_->GetCursorScreenPoint();
+}
+
+// static
+gfx::NativeWindow Screen::GetWindowAtCursorScreenPoint() {
+  if (!g_instance_)
+    return NULL;
+  return g_instance_->GetWindowAtCursorScreenPoint();
+}
+
+// static
+int Screen::GetNumMonitors() {
+  if (!g_instance_)
+    return 1;
+  return g_instance_->GetNumMonitors();
+}
+
+// static
+const gfx::Monitor* Screen::GetMonitorNearestWindow(gfx::NativeWindow window) {
+  if (!g_instance_)
+    return GetDefaultMonitor();
+  return g_instance_->GetMonitorNearestWindow(window);
+}
+
+// static
+const gfx::Monitor* Screen::GetMonitorNearestPoint(const gfx::Point& point) {
+  if (!g_instance_)
+    return GetDefaultMonitor();
+  return g_instance_->GetMonitorNearestPoint(point);
+}
+
+// static
+const gfx::Monitor* Screen::GetPrimaryMonitor() {
+  if (!g_instance_)
+    return GetDefaultMonitor();
+  return g_instance_->GetPrimaryMonitor();
+}
+
+// static
+const gfx::Monitor* Screen::GetMonitorMatching(const gfx::Rect& match_rect) {
+  if (!g_instance_)
+    return GetDefaultMonitor();
+  return g_instance_->GetMonitorNearestPoint(match_rect.CenterPoint());
+}
+
+}  // namespace gfx