Start of display management for mus

ash/display/screen_ash.cc

 // Copyright 2014 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_manager.h"
 #include "ash/display/window_tree_host_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/window_event_dispatcher.h"
 #include "ui/gfx/display.h"
+#include "ui/gfx/display_finder.h"
 #include "ui/gfx/screen.h"
 
 namespace ash {
 
 namespace {
 
 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:
   gfx::Point GetCursorScreenPoint() override { return gfx::Point(); }
   gfx::NativeWindow GetWindowUnderCursor() override { return NULL; }
   gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override {
     return NULL;
   }
   int GetNumDisplays() const override { return display_list_.size(); }
   std::vector<gfx::Display> GetAllDisplays() const override {
     return display_list_;
   }
   gfx::Display GetDisplayNearestWindow(gfx::NativeView view) const override {
     return primary_display_;
   }
   gfx::Display GetDisplayNearestPoint(const gfx::Point& point) const override {
-    return FindDisplayNearestPoint(display_list_, point);
+    return *gfx::FindDisplayNearestPoint(display_list_, point);
   }
   gfx::Display GetDisplayMatching(const gfx::Rect& match_rect) const override {
     const gfx::Display* matching =
-        FindDisplayMatching(display_list_, match_rect);
+        gfx::FindDisplayWithBiggestIntersection(display_list_, match_rect);
     // Fallback to the primary display if there is no matching display.
     return matching ? *matching : GetPrimaryDisplay();
   }
   gfx::Display GetPrimaryDisplay() const override { return primary_display_; }
   void AddObserver(gfx::DisplayObserver* observer) override {
     NOTREACHED() << "Observer should not be added during shutdown";
   }
   void RemoveObserver(gfx::DisplayObserver* observer) override {}
 
  private:
@@ skipping 78 matching lines @@
 }
 
 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()->active_display_list(),
-                                 point);
+  return *gfx::FindDisplayNearestPoint(
+      GetDisplayManager()->active_display_list(), 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(
+  const gfx::Display* matching = gfx::FindDisplayWithBiggestIntersection(
       GetDisplayManager()->active_display_list(), 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(
       WindowTreeHostManager::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