[Cleanup] Screen cleanup

ash/display/screen_ash.cc

Index: ash/display/screen_ash.cc
diff --git a/ash/display/screen_ash.cc b/ash/display/screen_ash.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ea649faa468b01e44423bf41cd16f7d03967b7d5
--- /dev/null
+++ b/ash/display/screen_ash.cc
@@ -0,0 +1,284 @@
+// 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 "ash/display/screen_ash.h"
+
+#include "ash/display/display_controller.h"
+#include "ash/display/display_manager.h"
+#include "ash/root_window_controller.h"
+#include "ash/root_window_settings.h"
+#include "ash/shelf/shelf_layout_manager.h"
+#include "ash/shelf/shelf_widget.h"
+#include "ash/shell.h"
+#include "ash/wm/coordinate_conversion.h"
+#include "base/logging.h"
+#include "ui/aura/client/screen_position_client.h"
+#include "ui/aura/env.h"
+#include "ui/aura/root_window.h"
+#include "ui/gfx/display.h"
+#include "ui/gfx/screen.h"
+
+namespace ash {
+
+namespace {
+
+internal::DisplayManager* GetDisplayManager() {
+  return Shell::GetInstance()->display_manager();
+}
+
+gfx::Display FindDisplayNearestPoint(const std::vector<gfx::Display>& displays,
+                                     const gfx::Point& point) {
+  int min_distance = INT_MAX;
+  const gfx::Display* nearest_display = NULL;
+  for (std::vector<gfx::Display>::const_iterator iter = displays.begin();
+       iter != displays.end(); ++iter) {
+    const gfx::Display& display = *iter;
+    int distance = display.bounds().ManhattanDistanceToPoint(point);
+    if (distance < min_distance) {
+      min_distance = distance;
+      nearest_display = &display;
+    }
+  }
+  // There should always be at least one display that is less than INT_MAX away.
+  DCHECK(nearest_display);
+  return *nearest_display;
+}
+
+const gfx::Display* FindDisplayMatching(
+    const std::vector<gfx::Display>& displays,
+    const gfx::Rect& match_rect) {
+  int max_area = 0;
+  const gfx::Display* matching = NULL;
+  for (std::vector<gfx::Display>::const_iterator iter = displays.begin();
+       iter != displays.end(); ++iter) {
+    const gfx::Display& display = *iter;
+    gfx::Rect intersect = gfx::IntersectRects(display.bounds(), match_rect);
+    int area = intersect.width() * intersect.height();
+    if (area > max_area) {
+      max_area = area;
+      matching = &display;
+    }
+  }
+  return matching;
+}
+
+class ScreenForShutdown : public gfx::Screen {
+ public:
+  explicit ScreenForShutdown(ScreenAsh* screen_ash)
+      : display_list_(screen_ash->GetAllDisplays()),
+        primary_display_(screen_ash->GetPrimaryDisplay()) {
+  }
+
+  // gfx::Screen overrides:
+  virtual bool IsDIPEnabled() OVERRIDE {
+    return true;
+  }
+  virtual gfx::Point GetCursorScreenPoint() OVERRIDE {
+    return gfx::Point();
+  }
+  virtual gfx::NativeWindow GetWindowUnderCursor() OVERRIDE {
+    return NULL;
+  }
+  virtual gfx::NativeWindow GetWindowAtScreenPoint(
+      const gfx::Point& point) OVERRIDE {
+    return NULL;
+  }
+  virtual int GetNumDisplays() const OVERRIDE {
+    return display_list_.size();
+  }
+  virtual std::vector<gfx::Display> GetAllDisplays() const OVERRIDE {
+    return display_list_;
+  }
+  virtual gfx::Display GetDisplayNearestWindow(gfx::NativeView view)
+      const OVERRIDE {
+    return primary_display_;
+  }
+  virtual gfx::Display GetDisplayNearestPoint(
+      const gfx::Point& point) const OVERRIDE {
+    return FindDisplayNearestPoint(display_list_, point);
+  }
+  virtual gfx::Display GetDisplayMatching(const gfx::Rect& match_rect)
+      const OVERRIDE {
+    const gfx::Display* matching =
+        FindDisplayMatching(display_list_, match_rect);
+    // Fallback to the primary display if there is no matching display.
+    return matching ? *matching : GetPrimaryDisplay();
+  }
+  virtual gfx::Display GetPrimaryDisplay() const OVERRIDE {
+    return primary_display_;
+  }
+  virtual void AddObserver(gfx::DisplayObserver* observer) OVERRIDE {
+    NOTREACHED() << "Observer should not be added during shutdown";
+  }
+  virtual void RemoveObserver(gfx::DisplayObserver* observer) OVERRIDE {
+  }
+
+ private:
+  const std::vector<gfx::Display> display_list_;
+  const gfx::Display primary_display_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScreenForShutdown);
+};
+
+}  // namespace
+
+ScreenAsh::ScreenAsh() {
+}
+
+ScreenAsh::~ScreenAsh() {
+}
+
+// static
+gfx::Display ScreenAsh::FindDisplayContainingPoint(const gfx::Point& point) {
+  return GetDisplayManager()->FindDisplayContainingPoint(point);
+}
+
+// static
+gfx::Rect ScreenAsh::GetMaximizedWindowBoundsInParent(aura::Window* window) {
+  if (internal::GetRootWindowController(window->GetRootWindow())->shelf())
+    return GetDisplayWorkAreaBoundsInParent(window);
+  else
+    return GetDisplayBoundsInParent(window);
+}
+
+// static
+gfx::Rect ScreenAsh::GetDisplayBoundsInParent(aura::Window* window) {
+  return ConvertRectFromScreen(
+      window->parent(),
+      Shell::GetScreen()->GetDisplayNearestWindow(window).bounds());
+}
+
+// static
+gfx::Rect ScreenAsh::GetDisplayWorkAreaBoundsInParent(aura::Window* window) {
+  return ConvertRectFromScreen(
+      window->parent(),
+      Shell::GetScreen()->GetDisplayNearestWindow(window).work_area());
+}
+
+// static
+gfx::Rect ScreenAsh::ConvertRectToScreen(aura::Window* window,
+                                         const gfx::Rect& rect) {
+  gfx::Point point = rect.origin();
+  aura::client::GetScreenPositionClient(window->GetRootWindow())->
+      ConvertPointToScreen(window, &point);
+  return gfx::Rect(point, rect.size());
+}
+
+// static
+gfx::Rect ScreenAsh::ConvertRectFromScreen(aura::Window* window,
+                                           const gfx::Rect& rect) {
+  gfx::Point point = rect.origin();
+  aura::client::GetScreenPositionClient(window->GetRootWindow())->
+      ConvertPointFromScreen(window, &point);
+  return gfx::Rect(point, rect.size());
+}
+
+// static
+const gfx::Display& ScreenAsh::GetSecondaryDisplay() {
+  internal::DisplayManager* display_manager = GetDisplayManager();
+  CHECK_EQ(2U, display_manager->GetNumDisplays());
+  return display_manager->GetDisplayAt(0).id() ==
+      Shell::GetScreen()->GetPrimaryDisplay().id() ?
+      display_manager->GetDisplayAt(1) : display_manager->GetDisplayAt(0);
+}
+
+// static
+const gfx::Display& ScreenAsh::GetDisplayForId(int64 display_id) {
+  return GetDisplayManager()->GetDisplayForId(display_id);
+}
+
+void ScreenAsh::NotifyBoundsChanged(const gfx::Display& display) {
+  FOR_EACH_OBSERVER(gfx::DisplayObserver, observers_,
+                    OnDisplayBoundsChanged(display));
+}
+
+void ScreenAsh::NotifyDisplayAdded(const gfx::Display& display) {
+  FOR_EACH_OBSERVER(gfx::DisplayObserver, observers_, OnDisplayAdded(display));
+}
+
+void ScreenAsh::NotifyDisplayRemoved(const gfx::Display& display) {
+  FOR_EACH_OBSERVER(
+      gfx::DisplayObserver, observers_, OnDisplayRemoved(display));
+}
+
+bool ScreenAsh::IsDIPEnabled() {
+  return true;
+}
+
+gfx::Point ScreenAsh::GetCursorScreenPoint() {
+  return aura::Env::GetInstance()->last_mouse_location();
+}
+
+gfx::NativeWindow ScreenAsh::GetWindowUnderCursor() {
+  return GetWindowAtScreenPoint(Shell::GetScreen()->GetCursorScreenPoint());
+}
+
+gfx::NativeWindow ScreenAsh::GetWindowAtScreenPoint(const gfx::Point& point) {
+  return wm::GetRootWindowAt(point)->GetTopWindowContainingPoint(point);
+}
+
+int ScreenAsh::GetNumDisplays() const {
+  return GetDisplayManager()->GetNumDisplays();
+}
+
+std::vector<gfx::Display> ScreenAsh::GetAllDisplays() const {
+  return GetDisplayManager()->displays();
+}
+
+gfx::Display ScreenAsh::GetDisplayNearestWindow(gfx::NativeView window) const {
+  if (!window)
+    return GetPrimaryDisplay();
+  const aura::Window* root_window = window->GetRootWindow();
+  if (!root_window)
+    return GetPrimaryDisplay();
+  int64 id = internal::GetRootWindowSettings(root_window)->display_id;
+  // if id is |kInvaildDisplayID|, it's being deleted.
+  DCHECK(id != gfx::Display::kInvalidDisplayID);
+
+  internal::DisplayManager* display_manager = GetDisplayManager();
+  // RootWindow needs Display to determine its device scale factor
+  // for non desktop display.
+  if (display_manager->non_desktop_display().id() == id)
+    return display_manager->non_desktop_display();
+  return display_manager->GetDisplayForId(id);
+}
+
+gfx::Display ScreenAsh::GetDisplayNearestPoint(const gfx::Point& point) const {
+  const gfx::Display& display =
+      GetDisplayManager()->FindDisplayContainingPoint(point);
+  if (display.is_valid())
+    return display;
+  // Fallback to the display that has the shortest Manhattan distance from
+  // the |point|. This is correct in the only areas that matter, namely in the
+  // corners between the physical screens.
+  return FindDisplayNearestPoint(GetDisplayManager()->displays(), point);
+}
+
+gfx::Display ScreenAsh::GetDisplayMatching(const gfx::Rect& match_rect) const {
+  if (match_rect.IsEmpty())
+    return GetDisplayNearestPoint(match_rect.origin());
+  const gfx::Display* matching =
+      FindDisplayMatching(GetDisplayManager()->displays(), match_rect);
+  // Fallback to the primary display if there is no matching display.
+  return matching ? *matching : GetPrimaryDisplay();
+}
+
+gfx::Display ScreenAsh::GetPrimaryDisplay() const {
+  return GetDisplayManager()->GetDisplayForId(
+      DisplayController::GetPrimaryDisplayId());
+}
+
+void ScreenAsh::AddObserver(gfx::DisplayObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void ScreenAsh::RemoveObserver(gfx::DisplayObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+gfx::Screen* ScreenAsh::CloneForShutdown() {
+  return new ScreenForShutdown(this);
+}
+
+}  // namespace ash