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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ui/gfx/screen.h"
      6 
      7 #import <ApplicationServices/ApplicationServices.h>
      8 #import <Cocoa/Cocoa.h>
      9 
     10 #include <map>
     11 
     12 #include "base/logging.h"
     13 #include "base/mac/sdk_forward_declarations.h"
     14 #include "base/timer/timer.h"
     15 #include "ui/gfx/display.h"
     16 #include "ui/gfx/display_change_notifier.h"
     17 
     18 namespace {
     19 
     20 // The delay to handle the display configuration changes.
     21 // See comments in ScreenMac::HandleDisplayReconfiguration.
     22 const int64 kConfigureDelayMs = 500;
     23 
     24 gfx::Rect ConvertCoordinateSystem(NSRect ns_rect) {
     25   // Primary monitor is defined as the monitor with the menubar,
     26   // which is always at index 0.
     27   NSScreen* primary_screen = [[NSScreen screens] objectAtIndex:0];
     28   float primary_screen_height = [primary_screen frame].size.height;
     29   gfx::Rect rect(NSRectToCGRect(ns_rect));
     30   rect.set_y(primary_screen_height - rect.y() - rect.height());
     31   return rect;
     32 }
     33 
     34 NSScreen* GetMatchingScreen(const gfx::Rect& match_rect) {
     35   // Default to the monitor with the current keyboard focus, in case
     36   // |match_rect| is not on any screen at all.
     37   NSScreen* max_screen = [NSScreen mainScreen];
     38   int max_area = 0;
     39 
     40   for (NSScreen* screen in [NSScreen screens]) {
     41     gfx::Rect monitor_area = ConvertCoordinateSystem([screen frame]);
     42     gfx::Rect intersection = gfx::IntersectRects(monitor_area, match_rect);
     43     int area = intersection.width() * intersection.height();
     44     if (area > max_area) {
     45       max_area = area;
     46       max_screen = screen;
     47     }
     48   }
     49 
     50   return max_screen;
     51 }
     52 
     53 gfx::Display GetDisplayForScreen(NSScreen* screen) {
     54   NSRect frame = [screen frame];
     55 
     56   CGDirectDisplayID display_id = [[[screen deviceDescription]
     57     objectForKey:@"NSScreenNumber"] unsignedIntValue];
     58 
     59   gfx::Display display(display_id, gfx::Rect(NSRectToCGRect(frame)));
     60   NSRect visible_frame = [screen visibleFrame];
     61   NSScreen* primary = [[NSScreen screens] objectAtIndex:0];
     62 
     63   // Convert work area's coordinate systems.
     64   if ([screen isEqual:primary]) {
     65     gfx::Rect work_area = gfx::Rect(NSRectToCGRect(visible_frame));
     66     work_area.set_y(frame.size.height - visible_frame.origin.y -
     67                     visible_frame.size.height);
     68     display.set_work_area(work_area);
     69   } else {
     70     display.set_bounds(ConvertCoordinateSystem(frame));
     71     display.set_work_area(ConvertCoordinateSystem(visible_frame));
     72   }
     73   CGFloat scale;
     74   if ([screen respondsToSelector:@selector(backingScaleFactor)])
     75     scale = [screen backingScaleFactor];
     76   else
     77     scale = [screen userSpaceScaleFactor];
     78   display.set_device_scale_factor(scale);
     79   // CGDisplayRotation returns a double. Display::SetRotationAsDegree will
     80   // handle the unexpected situations were the angle is not a multiple of 90.
     81   display.SetRotationAsDegree(static_cast<int>(CGDisplayRotation(display_id)));
     82   return display;
     83 }
     84 
     85 class ScreenMac : public gfx::Screen {
     86  public:
     87   ScreenMac() {
     88     displays_ = BuildDisplaysFromQuartz();
     89 
     90     CGDisplayRegisterReconfigurationCallback(
     91         ScreenMac::DisplayReconfigurationCallBack, this);
     92   }
     93 
     94   virtual bool IsDIPEnabled() OVERRIDE {
     95     return true;
     96   }
     97 
     98   virtual gfx::Point GetCursorScreenPoint() OVERRIDE {
     99     NSPoint mouseLocation  = [NSEvent mouseLocation];
    100     // Flip coordinates to gfx (0,0 in top-left corner) using primary screen.
    101     NSScreen* screen = [[NSScreen screens] objectAtIndex:0];
    102     mouseLocation.y = NSMaxY([screen frame]) - mouseLocation.y;
    103     return gfx::Point(mouseLocation.x, mouseLocation.y);
    104   }
    105 
    106   virtual gfx::NativeWindow GetWindowUnderCursor() OVERRIDE {
    107     NOTIMPLEMENTED();
    108     return gfx::NativeWindow();
    109   }
    110 
    111   virtual gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point)
    112       OVERRIDE {
    113     NOTIMPLEMENTED();
    114     return gfx::NativeWindow();
    115   }
    116 
    117   virtual int GetNumDisplays() const OVERRIDE {
    118     return GetAllDisplays().size();
    119 
    120   }
    121 
    122   virtual std::vector<gfx::Display> GetAllDisplays() const OVERRIDE {
    123     return displays_;
    124   }
    125 
    126   virtual gfx::Display GetDisplayNearestWindow(
    127       gfx::NativeView view) const OVERRIDE {
    128     NSWindow* window = nil;
    129 #if !defined(USE_AURA)
    130     window = [view window];
    131 #endif
    132     if (!window)
    133       return GetPrimaryDisplay();
    134     NSScreen* match_screen = [window screen];
    135     if (!match_screen)
    136       return GetPrimaryDisplay();
    137     return GetDisplayForScreen(match_screen);
    138   }
    139 
    140   virtual gfx::Display GetDisplayNearestPoint(
    141       const gfx::Point& point) const OVERRIDE {
    142     NSPoint ns_point = NSPointFromCGPoint(point.ToCGPoint());
    143 
    144     NSArray* screens = [NSScreen screens];
    145     NSScreen* primary = [screens objectAtIndex:0];
    146     ns_point.y = NSMaxY([primary frame]) - ns_point.y;
    147     for (NSScreen* screen in screens) {
    148       if (NSMouseInRect(ns_point, [screen frame], NO))
    149         return GetDisplayForScreen(screen);
    150     }
    151     return GetPrimaryDisplay();
    152   }
    153 
    154   // Returns the display that most closely intersects the provided bounds.
    155   virtual gfx::Display GetDisplayMatching(
    156       const gfx::Rect& match_rect) const OVERRIDE {
    157     NSScreen* match_screen = GetMatchingScreen(match_rect);
    158     return GetDisplayForScreen(match_screen);
    159   }
    160 
    161   // Returns the primary display.
    162   virtual gfx::Display GetPrimaryDisplay() const OVERRIDE {
    163     // Primary display is defined as the display with the menubar,
    164     // which is always at index 0.
    165     NSScreen* primary = [[NSScreen screens] objectAtIndex:0];
    166     gfx::Display display = GetDisplayForScreen(primary);
    167     return display;
    168   }
    169 
    170   virtual void AddObserver(gfx::DisplayObserver* observer) OVERRIDE {
    171     change_notifier_.AddObserver(observer);
    172   }
    173 
    174   virtual void RemoveObserver(gfx::DisplayObserver* observer) OVERRIDE {
    175     change_notifier_.RemoveObserver(observer);
    176   }
    177 
    178   static void DisplayReconfigurationCallBack(CGDirectDisplayID display,
    179                                              CGDisplayChangeSummaryFlags flags,
    180                                              void* userInfo) {
    181     if (flags & kCGDisplayBeginConfigurationFlag)
    182       return;
    183 
    184     static_cast<ScreenMac*>(userInfo)->HandleDisplayReconfiguration();
    185   }
    186 
    187   void HandleDisplayReconfiguration() {
    188     // Given that we need to rebuild the list of displays, we want to coalesce
    189     // the events. For that, we use a timer that will be reset every time we get
    190     // a new event and will be fulfilled kConfigureDelayMs after the latest.
    191     if (configure_timer_.get() && configure_timer_->IsRunning()) {
    192       configure_timer_->Reset();
    193       return;
    194     }
    195 
    196     configure_timer_.reset(new base::OneShotTimer<ScreenMac>());
    197     configure_timer_->Start(
    198         FROM_HERE,
    199         base::TimeDelta::FromMilliseconds(kConfigureDelayMs),
    200         this,
    201         &ScreenMac::ConfigureTimerFired);
    202   }
    203 
    204  private:
    205   void ConfigureTimerFired() {
    206     std::vector<gfx::Display> old_displays = displays_;
    207     displays_ = BuildDisplaysFromQuartz();
    208 
    209     change_notifier_.NotifyDisplaysChanged(old_displays, displays_);
    210   }
    211 
    212   std::vector<gfx::Display> BuildDisplaysFromQuartz() const {
    213     // Don't just return all online displays.  This would include displays
    214     // that mirror other displays, which are not desired in this list.  It's
    215     // tempting to use the count returned by CGGetActiveDisplayList, but active
    216     // displays exclude sleeping displays, and those are desired.
    217 
    218     // It would be ridiculous to have this many displays connected, but
    219     // CGDirectDisplayID is just an integer, so supporting up to this many
    220     // doesn't hurt.
    221     CGDirectDisplayID online_displays[128];
    222     CGDisplayCount online_display_count = 0;
    223     if (CGGetOnlineDisplayList(arraysize(online_displays),
    224                               online_displays,
    225                               &online_display_count) != kCGErrorSuccess) {
    226       return std::vector<gfx::Display>(1, GetPrimaryDisplay());
    227     }
    228 
    229     typedef std::map<int64, NSScreen*> ScreenIdsToScreensMap;
    230     ScreenIdsToScreensMap screen_ids_to_screens;
    231     for (NSScreen* screen in [NSScreen screens]) {
    232       NSDictionary* screen_device_description = [screen deviceDescription];
    233       int64 screen_id = [[screen_device_description
    234         objectForKey:@"NSScreenNumber"] unsignedIntValue];
    235       screen_ids_to_screens[screen_id] = screen;
    236     }
    237 
    238     std::vector<gfx::Display> displays;
    239     for (CGDisplayCount online_display_index = 0;
    240         online_display_index < online_display_count;
    241         ++online_display_index) {
    242       CGDirectDisplayID online_display = online_displays[online_display_index];
    243       if (CGDisplayMirrorsDisplay(online_display) == kCGNullDirectDisplay) {
    244         // If this display doesn't mirror any other, include it in the list.
    245         // The primary display in a mirrored set will be counted, but those that
    246         // mirror it will not be.
    247         ScreenIdsToScreensMap::iterator foundScreen =
    248           screen_ids_to_screens.find(online_display);
    249         if (foundScreen != screen_ids_to_screens.end()) {
    250             displays.push_back(GetDisplayForScreen(foundScreen->second));
    251         }
    252       }
    253     }
    254 
    255     if (!displays.size())
    256       return std::vector<gfx::Display>(1, GetPrimaryDisplay());
    257 
    258     return displays;
    259   }
    260 
    261   // The displays currently attached to the device.
    262   std::vector<gfx::Display> displays_;
    263 
    264   // The timer to delay configuring outputs. See also the comments in
    265   // HandleDisplayReconfiguration().
    266   scoped_ptr<base::OneShotTimer<ScreenMac> > configure_timer_;
    267 
    268   gfx::DisplayChangeNotifier change_notifier_;
    269 
    270   DISALLOW_COPY_AND_ASSIGN(ScreenMac);
    271 };
    272 
    273 }  // namespace
    274 
    275 namespace gfx {
    276 
    277 #if !defined(USE_AURA)
    278 Screen* CreateNativeScreen() {
    279   return new ScreenMac;
    280 }
    281 #endif
    282 
    283 }
    284