Creating default implementation for aura::client::ScreenPositionClient

ui/views/widget/desktop_aura/desktop_screen_position_client.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/views/widget/desktop_aura/desktop_screen_position_client.h"
 
-#include "ui/aura/window_tree_host.h"
-#include "ui/gfx/display.h"
-#include "ui/gfx/point_conversions.h"
-#include "ui/gfx/screen.h"
 #include "ui/views/widget/desktop_aura/desktop_native_widget_aura.h"
 
 namespace views {
 
 namespace {
 
-gfx::Point GetOrigin(const aura::Window* root_window) {
-  gfx::Point origin_in_pixels = root_window->GetHost()->GetBounds().origin();
-  aura::Window* window = const_cast<aura::Window*>(root_window);
-  float scale = gfx::Screen::GetScreenFor(window)->
-       GetDisplayNearestWindow(window).device_scale_factor();
-  return gfx::ToFlooredPoint(gfx::ScalePoint(origin_in_pixels, 1 / scale));
-}
-
-// Returns true if bounds passed to window are treated as though they are in
-// screen coordinates.
+// Returns true if bounds passed to window in SetBounds should be treated as
+// though they are in screen coordinates.
 bool PositionWindowInScreenCoordinates(aura::Window* window) {
   if (window->type() == ui::wm::WINDOW_TYPE_POPUP)
     return true;
 
   Widget* widget = Widget::GetWidgetForNativeView(window);
   return widget && widget->is_top_level();
 }
 
 }  // namespace
 
 DesktopScreenPositionClient::DesktopScreenPositionClient(
     aura::Window* root_window)
-    : root_window_(root_window) {
+    : wm::DefaultScreenPositionClient(), root_window_(root_window) {
   aura::client::SetScreenPositionClient(root_window_, this);
 }
 
 DesktopScreenPositionClient::~DesktopScreenPositionClient() {
   aura::client::SetScreenPositionClient(root_window_, NULL);
 }
 
-void DesktopScreenPositionClient::ConvertPointToScreen(
-    const aura::Window* window,
-    gfx::Point* point) {
-  const aura::Window* root_window = window->GetRootWindow();
-  aura::Window::ConvertPointToTarget(window, root_window, point);
-  gfx::Point origin = GetOrigin(root_window);
-  point->Offset(origin.x(), origin.y());
-}
-
-void DesktopScreenPositionClient::ConvertPointFromScreen(
-    const aura::Window* window,
-    gfx::Point* point) {
-  const aura::Window* root_window = window->GetRootWindow();
-  gfx::Point origin = GetOrigin(root_window);
-  point->Offset(-origin.x(), -origin.y());
-  aura::Window::ConvertPointToTarget(root_window, window, point);
-}
-
-void DesktopScreenPositionClient::ConvertHostPointToScreen(aura::Window* window,
-                                                           gfx::Point* point) {
-  aura::Window* root_window = window->GetRootWindow();
-  ConvertPointToScreen(root_window, point);
-}
-
 void DesktopScreenPositionClient::SetBounds(aura::Window* window,
                                             const gfx::Rect& bounds,
                                             const gfx::Display& display) {
-  // TODO: Use the 3rd parameter, |display|.
+  // TODO(jam): Use the 3rd parameter, |display|.
   aura::Window* root = window->GetRootWindow();
 
   // This method assumes that |window| does not have an associated
   // DesktopNativeWidgetAura.
   internal::NativeWidgetPrivate* desktop_native_widget =
       DesktopNativeWidgetAura::ForWindow(root);
   DCHECK(!desktop_native_widget ||
          desktop_native_widget->GetNativeView() != window);
 
   if (PositionWindowInScreenCoordinates(window)) {
     // The caller expects windows we consider "embedded" to be placed in the
     // screen coordinate system. So we need to offset the root window's
     // position (which is in screen coordinates) from these bounds.
 
     gfx::Point origin = bounds.origin();
     aura::Window::ConvertPointToTarget(window->parent(), root, &origin);
 
     gfx::Point host_origin = GetOrigin(root);
     origin.Offset(-host_origin.x(), -host_origin.y());
     window->SetBounds(gfx::Rect(origin, bounds.size()));
     return;
   }
 
   window->SetBounds(bounds);
 }
 
 }  // namespace views