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// 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"
#import <ApplicationServices/ApplicationServices.h>
#import <Cocoa/Cocoa.h>
@interface NSScreen (LionAPI)
- (CGFloat)backingScaleFactor;
@end
#include "base/logging.h"
#include "ui/gfx/monitor.h"
namespace {
gfx::Rect ConvertCoordinateSystem(NSRect ns_rect) {
// Primary monitor is defined as the monitor with the menubar,
// which is always at index 0.
NSScreen* primary_screen = [[NSScreen screens] objectAtIndex:0];
float primary_screen_height = [primary_screen frame].size.height;
gfx::Rect rect(NSRectToCGRect(ns_rect));
rect.set_y(primary_screen_height - rect.y() - rect.height());
return rect;
}
NSScreen* GetMatchingScreen(const gfx::Rect& match_rect) {
// Default to the monitor with the current keyboard focus, in case
// |match_rect| is not on any screen at all.
NSScreen* max_screen = [NSScreen mainScreen];
int max_area = 0;
for (NSScreen* screen in [NSScreen screens]) {
gfx::Rect monitor_area = ConvertCoordinateSystem([screen frame]);
gfx::Rect intersection = monitor_area.Intersect(match_rect);
int area = intersection.width() * intersection.height();
if (area > max_area) {
max_area = area;
max_screen = screen;
}
}
return max_screen;
}
gfx::Monitor GetMonitorForScreen(NSScreen* screen, bool is_primary) {
NSRect frame = [screen frame];
// TODO(oshima): Implement ID and Observer.
gfx::Monitor monitor(0, gfx::Rect(NSRectToCGRect(frame)));
NSRect visible_frame = [screen visibleFrame];
// Convert work area's coordinate systems.
if (is_primary) {
gfx::Rect work_area = gfx::Rect(NSRectToCGRect(visible_frame));
work_area.set_y(frame.size.height - visible_frame.origin.y -
visible_frame.size.height);
monitor.set_work_area(work_area);
} else {
monitor.set_work_area(ConvertCoordinateSystem(visible_frame));
}
CGFloat scale;
if ([screen respondsToSelector:@selector(backingScaleFactor)])
scale = [screen backingScaleFactor];
else
scale = [screen userSpaceScaleFactor];
monitor.set_device_scale_factor(scale);
return monitor;
}
} // namespace
namespace gfx {
// static
bool Screen::IsDIPEnabled() {
return true;
}
// static
gfx::Point Screen::GetCursorScreenPoint() {
NSPoint mouseLocation = [NSEvent mouseLocation];
// Flip coordinates to gfx (0,0 in top-left corner) using primary screen.
NSScreen* screen = [[NSScreen screens] objectAtIndex:0];
mouseLocation.y = NSMaxY([screen frame]) - mouseLocation.y;
return gfx::Point(mouseLocation.x, mouseLocation.y);
}
// static
gfx::Monitor Screen::GetMonitorNearestWindow(gfx::NativeView view) {
NSWindow* window = [view window];
if (!window)
return GetPrimaryMonitor();
NSScreen* match_screen = [window screen];
return GetMonitorForScreen(match_screen, false /* may not be primary */);
}
// static
gfx::Monitor Screen::GetPrimaryMonitor() {
// Primary monitor is defined as the monitor with the menubar,
// which is always at index 0.
NSScreen* primary = [[NSScreen screens] objectAtIndex:0];
gfx::Monitor monitor = GetMonitorForScreen(primary, true /* primary */);
return monitor;
}
// static
gfx::Monitor Screen::GetMonitorMatching(const gfx::Rect& match_rect) {
NSScreen* match_screen = GetMatchingScreen(match_rect);
return GetMonitorForScreen(match_screen, false /* may not be primary */);
}
// static
int Screen::GetNumMonitors() {
// Don't just return the number of online displays. It includes displays
// that mirror other displays, which are not desired in the count. It's
// tempting to use the count returned by CGGetActiveDisplayList, but active
// displays exclude sleeping displays, and those are desired in the count.
// It would be ridiculous to have this many displays connected, but
// CGDirectDisplayID is just an integer, so supporting up to this many
// doesn't hurt.
CGDirectDisplayID online_displays[128];
CGDisplayCount online_display_count = 0;
if (CGGetOnlineDisplayList(arraysize(online_displays),
online_displays,
&online_display_count) != kCGErrorSuccess) {
// 1 is a reasonable assumption.
return 1;
}
int display_count = 0;
for (CGDisplayCount online_display_index = 0;
online_display_index < online_display_count;
++online_display_index) {
CGDirectDisplayID online_display = online_displays[online_display_index];
if (CGDisplayMirrorsDisplay(online_display) == kCGNullDirectDisplay) {
// If this display doesn't mirror any other, include it in the count.
// The primary display in a mirrored set will be counted, but those that
// mirror it will not be.
++display_count;
}
}
return display_count;
}
} // namespace gfx
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