electron/atom/browser/native_window_mac.mm

// Copyright (c) 2013 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#include "atom/browser/native_window_mac.h"

#include <Quartz/Quartz.h>
#include <string>

#include "atom/browser/window_list.h"
#include "atom/common/color_util.h"
#include "atom/common/draggable_region.h"
#include "atom/common/options_switches.h"
#include "base/mac/mac_util.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/strings/sys_string_conversions.h"
#include "brightray/browser/inspectable_web_contents.h"
#include "brightray/browser/inspectable_web_contents_view.h"
#include "brightray/browser/mac/event_dispatching_window.h"
#include "content/public/browser/browser_accessibility_state.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/render_widget_host_view.h"
#include "native_mate/dictionary.h"
#include "skia/ext/skia_utils_mac.h"
#include "third_party/skia/include/core/SkRegion.h"
#include "ui/gfx/skia_util.h"

namespace {

// Prevents window from resizing during the scope.
class ScopedDisableResize {
 public:
  ScopedDisableResize() { disable_resize_ = true; }
  ~ScopedDisableResize() { disable_resize_ = false; }

  static bool IsResizeDisabled() { return disable_resize_; }

 private:
  static bool disable_resize_;
};

bool ScopedDisableResize::disable_resize_ = false;

}  // namespace

// This view always takes the size of its superview. It is intended to be used
// as a NSWindow's contentView.  It is needed because NSWindow's implementation
// explicitly resizes the contentView at inopportune times.
@interface FullSizeContentView : NSView
@end

@implementation FullSizeContentView

// This method is directly called by NSWindow during a window resize on OSX
// 10.10.0, beta 2. We must override it to prevent the content view from
// shrinking.
- (void)setFrameSize:(NSSize)size {
  if ([self superview])
    size = [[self superview] bounds].size;
  [super setFrameSize:size];
}

// The contentView gets moved around during certain full-screen operations.
// This is less than ideal, and should eventually be removed.
- (void)viewDidMoveToSuperview {
  [self setFrame:[[self superview] bounds]];
}

@end

@interface AtomNSWindowDelegate : NSObject<NSWindowDelegate> {
 @private
  atom::NativeWindowMac* shell_;
  bool is_zooming_;
}
- (id)initWithShell:(atom::NativeWindowMac*)shell;
@end

@implementation AtomNSWindowDelegate

- (id)initWithShell:(atom::NativeWindowMac*)shell {
  if ((self = [super init])) {
    shell_ = shell;
    is_zooming_ = false;
  }
  return self;
}

- (void)windowDidChangeOcclusionState:(NSNotification *)notification {
  // notification.object is the window that changed its state.
  // It's safe to use self.window instead if you don't assign one delegate to many windows
  NSWindow *window = notification.object;

  // check occlusion binary flag
  if (window.occlusionState & NSWindowOcclusionStateVisible)   {
     // The app is visible
     shell_->NotifyWindowShow();
   } else {
     // The app is not visible
     shell_->NotifyWindowHide();
   }
}

// Called when the user clicks the zoom button or selects it from the Window
// menu to determine the "standard size" of the window.
- (NSRect)windowWillUseStandardFrame:(NSWindow*)window
                        defaultFrame:(NSRect)frame {
  if (!shell_->zoom_to_page_width())
    return frame;

  // If the shift key is down, maximize.
  if ([[NSApp currentEvent] modifierFlags] & NSShiftKeyMask)
    return frame;

  content::WebContents* web_contents = shell_->web_contents();
  if (!web_contents)
    return frame;

  CGFloat page_width = static_cast<CGFloat>(
      web_contents->GetPreferredSize().width());
  NSRect window_frame = [window frame];

  // Never shrink from the current size on zoom.
  CGFloat zoomed_width = std::max(page_width, NSWidth(window_frame));

  // |frame| determines our maximum extents. We need to set the origin of the
  // frame -- and only move it left if necessary.
  if (window_frame.origin.x + zoomed_width > NSMaxX(frame))
    frame.origin.x = NSMaxX(frame) - zoomed_width;
  else
    frame.origin.x = window_frame.origin.x;

  // Set the width. Don't touch y or height.
  frame.size.width = zoomed_width;

  return frame;
}

- (void)windowDidBecomeMain:(NSNotification*)notification {
  content::WebContents* web_contents = shell_->web_contents();
  if (!web_contents)
    return;

  web_contents->RestoreFocus();

  content::RenderWidgetHostView* rwhv = web_contents->GetRenderWidgetHostView();
  if (rwhv)
    rwhv->SetActive(true);

  shell_->NotifyWindowFocus();
}

- (void)windowDidResignMain:(NSNotification*)notification {
  content::WebContents* web_contents = shell_->web_contents();
  if (!web_contents)
    return;

  web_contents->StoreFocus();

  content::RenderWidgetHostView* rwhv = web_contents->GetRenderWidgetHostView();
  if (rwhv)
    rwhv->SetActive(false);

  shell_->NotifyWindowBlur();
}

- (NSSize)windowWillResize:(NSWindow*)sender toSize:(NSSize)frameSize {
  NSSize newSize = frameSize;
  double aspectRatio = shell_->GetAspectRatio();

  if (aspectRatio > 0.0) {
    gfx::Size windowSize = shell_->GetSize();
    gfx::Size contentSize = shell_->GetContentSize();
    gfx::Size extraSize = shell_->GetAspectRatioExtraSize();

    double extraWidthPlusFrame =
        windowSize.width() - contentSize.width() + extraSize.width();
    double extraHeightPlusFrame =
        windowSize.height() - contentSize.height() + extraSize.height();

    newSize.width =
        roundf((frameSize.height - extraHeightPlusFrame) * aspectRatio +
               extraWidthPlusFrame);
    newSize.height =
        roundf((newSize.width - extraWidthPlusFrame) / aspectRatio +
               extraHeightPlusFrame);
  }

  return newSize;
}

- (void)windowDidResize:(NSNotification*)notification {
  shell_->UpdateDraggableRegionViews();
  shell_->NotifyWindowResize();
}

- (void)windowDidMove:(NSNotification*)notification {
  // TODO(zcbenz): Remove the alias after figuring out a proper
  // way to dispatch move.
  shell_->NotifyWindowMove();
  shell_->NotifyWindowMoved();
}

- (void)windowDidMiniaturize:(NSNotification*)notification {
  shell_->NotifyWindowMinimize();
}

- (void)windowDidDeminiaturize:(NSNotification*)notification {
  shell_->NotifyWindowRestore();
}

- (BOOL)windowShouldZoom:(NSWindow*)window toFrame:(NSRect)newFrame {
  is_zooming_ = true;
  return YES;
}

- (void)windowDidEndLiveResize:(NSNotification*)notification {
  if (is_zooming_) {
    if (shell_->IsMaximized())
      shell_->NotifyWindowMaximize();
    else
      shell_->NotifyWindowUnmaximize();
    is_zooming_ = false;
  }
}

- (void)windowWillEnterFullScreen:(NSNotification*)notification {
  // Hide the native toolbar before entering fullscreen, so there is no visual
  // artifacts.
  if (base::mac::IsOSYosemiteOrLater() &&
      shell_->title_bar_style() == atom::NativeWindowMac::HIDDEN_INSET) {
    NSWindow* window = shell_->GetNativeWindow();
    [window setToolbar:nil];
  }
}

- (void)windowDidEnterFullScreen:(NSNotification*)notification {
  shell_->NotifyWindowEnterFullScreen();

  // For frameless window we don't show set title for normal mode since the
  // titlebar is expected to be empty, but after entering fullscreen mode we
  // have to set one, because title bar is visible here.
  NSWindow* window = shell_->GetNativeWindow();
  if ((shell_->transparent() || !shell_->has_frame()) &&
      base::mac::IsOSYosemiteOrLater() &&
      // FIXME(zcbenz): Showing titlebar for hiddenInset window is weird under
      // fullscreen mode.
      shell_->title_bar_style() != atom::NativeWindowMac::HIDDEN_INSET) {
    [window setTitleVisibility:NSWindowTitleVisible];
  }

  // Restore the native toolbar immediately after entering fullscreen, if we do
  // this before leaving fullscreen, traffic light buttons will be jumping.
  if (base::mac::IsOSYosemiteOrLater() &&
      shell_->title_bar_style() == atom::NativeWindowMac::HIDDEN_INSET) {
    base::scoped_nsobject<NSToolbar> toolbar(
        [[NSToolbar alloc] initWithIdentifier:@"titlebarStylingToolbar"]);
    [toolbar setShowsBaselineSeparator:NO];
    [window setToolbar:toolbar];

    // Set window style to hide the toolbar, otherwise the toolbar will show in
    // fullscreen mode.
    shell_->SetStyleMask(true, NSFullSizeContentViewWindowMask);
  }
}

- (void)windowWillExitFullScreen:(NSNotification*)notification {
  // Restore the titlebar visibility.
  NSWindow* window = shell_->GetNativeWindow();
  if ((shell_->transparent() || !shell_->has_frame()) &&
      base::mac::IsOSYosemiteOrLater() &&
      shell_->title_bar_style() != atom::NativeWindowMac::HIDDEN_INSET) {
    [window setTitleVisibility:NSWindowTitleHidden];
  }

  // Turn off the style for toolbar.
  if (base::mac::IsOSYosemiteOrLater() &&
      shell_->title_bar_style() == atom::NativeWindowMac::HIDDEN_INSET) {
    shell_->SetStyleMask(false, NSFullSizeContentViewWindowMask);
  }
}

- (void)windowDidExitFullScreen:(NSNotification*)notification {
  shell_->NotifyWindowLeaveFullScreen();
}

- (void)windowWillClose:(NSNotification*)notification {
  shell_->NotifyWindowClosed();

  // Clears the delegate when window is going to be closed, since EL Capitan it
  // is possible that the methods of delegate would get called after the window
  // has been closed.
  [shell_->GetNativeWindow() setDelegate:nil];
}

- (BOOL)windowShouldClose:(id)window {
  // When user tries to close the window by clicking the close button, we do
  // not close the window immediately, instead we try to close the web page
  // fisrt, and when the web page is closed the window will also be closed.
  shell_->RequestToClosePage();
  return NO;
}

- (NSRect)window:(NSWindow*)window
    willPositionSheet:(NSWindow*)sheet usingRect:(NSRect)rect {
  NSView* view = window.contentView;

  rect.origin.x = shell_->GetSheetOffsetX();
  rect.origin.y = view.frame.size.height - shell_->GetSheetOffsetY();
  return rect;
}

@end

@interface AtomPreviewItem : NSObject <QLPreviewItem>

@property (nonatomic, retain) NSURL* previewItemURL;
@property (nonatomic, retain) NSString* previewItemTitle;

- (id)initWithURL:(NSURL*)url title:(NSString*)title;

@end

@implementation AtomPreviewItem

- (id)initWithURL:(NSURL*)url title:(NSString*)title {
  self = [super init];
  if (self) {
    self.previewItemURL = url;
    self.previewItemTitle = title;
  }
  return self;
}

@end

@interface AtomNSWindow : EventDispatchingWindow<QLPreviewPanelDataSource, QLPreviewPanelDelegate> {
 @private
  atom::NativeWindowMac* shell_;
  bool enable_larger_than_screen_;
  CGFloat windowButtonsInterButtonSpacing_;
}
@property BOOL acceptsFirstMouse;
@property BOOL disableAutoHideCursor;
@property BOOL disableKeyOrMainWindow;
@property NSPoint windowButtonsOffset;
@property (nonatomic, retain) AtomPreviewItem* quickLookItem;
@property (nonatomic, retain) NSView* vibrantView;

- (void)setShell:(atom::NativeWindowMac*)shell;
- (void)setEnableLargerThanScreen:(bool)enable;
- (void)enableWindowButtonsOffset;
@end

@implementation AtomNSWindow

- (void)setShell:(atom::NativeWindowMac*)shell {
  shell_ = shell;
}

- (void)setEnableLargerThanScreen:(bool)enable {
  enable_larger_than_screen_ = enable;
}

// NSWindow overrides.

- (void)swipeWithEvent:(NSEvent *)event {
  if (event.deltaY == 1.0) {
    shell_->NotifyWindowSwipe("up");
  } else if (event.deltaX == -1.0) {
    shell_->NotifyWindowSwipe("right");
  } else if (event.deltaY == -1.0) {
    shell_->NotifyWindowSwipe("down");
  } else if (event.deltaX == 1.0) {
    shell_->NotifyWindowSwipe("left");
  }
}

- (NSRect)constrainFrameRect:(NSRect)frameRect toScreen:(NSScreen*)screen {
  // Resizing is disabled.
  if (ScopedDisableResize::IsResizeDisabled())
    return [self frame];

  // Enable the window to be larger than screen.
  if (enable_larger_than_screen_)
    return frameRect;
  else
    return [super constrainFrameRect:frameRect toScreen:screen];
}

- (void)setFrame:(NSRect)windowFrame display:(BOOL)displayViews {
  // constrainFrameRect is not called on hidden windows so disable adjusting
  // the frame directly when resize is disabled
  if (!ScopedDisableResize::IsResizeDisabled())
    [super setFrame:windowFrame display:displayViews];
}

- (id)accessibilityAttributeValue:(NSString*)attribute {
  if (![attribute isEqualToString:@"AXChildren"])
    return [super accessibilityAttributeValue:attribute];

  // Filter out objects that aren't the title bar buttons. This has the effect
  // of removing the window title, which VoiceOver already sees.
  // * when VoiceOver is disabled, this causes Cmd+C to be used for TTS but
  //   still leaves the buttons available in the accessibility tree.
  // * when VoiceOver is enabled, the full accessibility tree is used.
  // Without removing the title and with VO disabled, the TTS would always read
  // the window title instead of using Cmd+C to get the selected text.
  NSPredicate *predicate = [NSPredicate predicateWithFormat:
      @"(self isKindOfClass: %@) OR (self.className == %@)",
      [NSButtonCell class],
      @"RenderWidgetHostViewCocoa"];

  NSArray *children = [super accessibilityAttributeValue:attribute];
  return [children filteredArrayUsingPredicate:predicate];
}

- (BOOL)canBecomeMainWindow {
  return !self.disableKeyOrMainWindow;
}

- (BOOL)canBecomeKeyWindow {
  return !self.disableKeyOrMainWindow;
}

- (void)enableWindowButtonsOffset {
  auto closeButton = [self standardWindowButton:NSWindowCloseButton];
  auto miniaturizeButton = [self standardWindowButton:NSWindowMiniaturizeButton];
  auto zoomButton = [self standardWindowButton:NSWindowZoomButton];

  [closeButton setPostsFrameChangedNotifications:YES];
  [miniaturizeButton setPostsFrameChangedNotifications:YES];
  [zoomButton setPostsFrameChangedNotifications:YES];

  windowButtonsInterButtonSpacing_ =
    NSMinX([miniaturizeButton frame]) - NSMaxX([closeButton frame]);

  auto center = [NSNotificationCenter defaultCenter];

  [center addObserver:self
             selector:@selector(adjustCloseButton:)
                 name:NSViewFrameDidChangeNotification
               object:closeButton];

  [center addObserver:self
             selector:@selector(adjustMiniaturizeButton:)
                 name:NSViewFrameDidChangeNotification
               object:miniaturizeButton];

  [center addObserver:self
             selector:@selector(adjustZoomButton:)
                 name:NSViewFrameDidChangeNotification
               object:zoomButton];
}

- (void)adjustCloseButton:(NSNotification*)notification {
  [self adjustButton:[notification object]
              ofKind:NSWindowCloseButton];
}

- (void)adjustMiniaturizeButton:(NSNotification*)notification {
  [self adjustButton:[notification object]
              ofKind:NSWindowMiniaturizeButton];
}

- (void)adjustZoomButton:(NSNotification*)notification {
  [self adjustButton:[notification object]
              ofKind:NSWindowZoomButton];
}

- (void)adjustButton:(NSButton*)button
              ofKind:(NSWindowButton)kind {
  NSRect buttonFrame = [button frame];
  NSRect frameViewBounds = [[self frameView] bounds];
  NSPoint offset = self.windowButtonsOffset;

  buttonFrame.origin = NSMakePoint(
    offset.x,
    (NSHeight(frameViewBounds) - NSHeight(buttonFrame) - offset.y));

  switch (kind) {
    case NSWindowZoomButton:
      buttonFrame.origin.x += NSWidth(
        [[self standardWindowButton:NSWindowMiniaturizeButton] frame]);
      buttonFrame.origin.x += windowButtonsInterButtonSpacing_;
      // fallthrough
    case NSWindowMiniaturizeButton:
      buttonFrame.origin.x += NSWidth(
        [[self standardWindowButton:NSWindowCloseButton] frame]);
      buttonFrame.origin.x += windowButtonsInterButtonSpacing_;
      // fallthrough
    default:
      break;
  }

  BOOL didPost = [button postsBoundsChangedNotifications];
  [button setPostsFrameChangedNotifications:NO];
  [button setFrame:buttonFrame];
  [button setPostsFrameChangedNotifications:didPost];
}

- (NSView*)frameView {
  return [[self contentView] superview];
}

// Quicklook methods

- (BOOL)acceptsPreviewPanelControl:(QLPreviewPanel*)panel {
  return YES;
}

- (void)beginPreviewPanelControl:(QLPreviewPanel*)panel {
  panel.delegate = self;
  panel.dataSource = self;
}

- (void)endPreviewPanelControl:(QLPreviewPanel*)panel {
  panel.delegate = nil;
  panel.dataSource = nil;
}

- (NSInteger)numberOfPreviewItemsInPreviewPanel:(QLPreviewPanel*)panel {
  return 1;
}

- (id <QLPreviewItem>)previewPanel:(QLPreviewPanel*)panel previewItemAtIndex:(NSInteger)index {
  return [self quickLookItem];
}

- (void)previewFileAtPath:(NSString*)path  withName:(NSString*) fileName {
  NSURL* url = [[[NSURL alloc] initFileURLWithPath:path] autorelease];
  [self setQuickLookItem:[[[AtomPreviewItem alloc] initWithURL:url title:fileName] autorelease]];
  [[QLPreviewPanel sharedPreviewPanel] makeKeyAndOrderFront:nil];
}

@end

@interface ControlRegionView : NSView
@end

@implementation ControlRegionView

- (BOOL)mouseDownCanMoveWindow {
  return NO;
}

- (NSView*)hitTest:(NSPoint)aPoint {
  return nil;
}

@end

@interface NSView (WebContentsView)
- (void)setMouseDownCanMoveWindow:(BOOL)can_move;
@end

@interface AtomProgressBar : NSProgressIndicator
@end

@implementation AtomProgressBar

- (void)drawRect:(NSRect)dirtyRect {
  if (self.style != NSProgressIndicatorBarStyle)
    return;
  // Draw edges of rounded rect.
  NSRect rect = NSInsetRect([self bounds], 1.0, 1.0);
  CGFloat radius = rect.size.height / 2;
  NSBezierPath* bezier_path = [NSBezierPath bezierPathWithRoundedRect:rect xRadius:radius yRadius:radius];
  [bezier_path setLineWidth:2.0];
  [[NSColor grayColor] set];
  [bezier_path stroke];

  // Fill the rounded rect.
  rect = NSInsetRect(rect, 2.0, 2.0);
  radius = rect.size.height / 2;
  bezier_path = [NSBezierPath bezierPathWithRoundedRect:rect xRadius:radius yRadius:radius];
  [bezier_path setLineWidth:1.0];
  [bezier_path addClip];

  // Calculate the progress width.
  rect.size.width = floor(rect.size.width * ([self doubleValue] / [self maxValue]));

  // Fill the progress bar with color blue.
  [[NSColor colorWithSRGBRed:0.2 green:0.6 blue:1 alpha:1] set];
  NSRectFill(rect);
}

@end

namespace mate {

template<>
struct Converter<atom::NativeWindowMac::TitleBarStyle> {
  static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
                     atom::NativeWindowMac::TitleBarStyle* out) {
    std::string title_bar_style;
    if (!ConvertFromV8(isolate, val, &title_bar_style))
      return false;
    if (title_bar_style == "hidden") {
      *out = atom::NativeWindowMac::HIDDEN;
    } else if (title_bar_style == "hidden-inset" ||  // Deprecate this after 2.0
               title_bar_style == "hiddenInset") {
      *out = atom::NativeWindowMac::HIDDEN_INSET;
    } else {
      return false;
    }
    return true;
  }
};

}  // namespace mate

namespace atom {

NativeWindowMac::NativeWindowMac(
    brightray::InspectableWebContents* web_contents,
    const mate::Dictionary& options,
    NativeWindow* parent)
    : NativeWindow(web_contents, options, parent),
      is_kiosk_(false),
      was_fullscreen_(false),
      zoom_to_page_width_(false),
      attention_request_id_(0),
      title_bar_style_(NORMAL) {
  int width = 800, height = 600;
  options.Get(options::kWidth, &width);
  options.Get(options::kHeight, &height);

  NSRect main_screen_rect = [[[NSScreen screens] firstObject] frame];
  NSRect cocoa_bounds = NSMakeRect(
      round((NSWidth(main_screen_rect) - width) / 2) ,
      round((NSHeight(main_screen_rect) - height) / 2),
      width,
      height);

  bool resizable = true;
  options.Get(options::kResizable, &resizable);

  bool minimizable = true;
  options.Get(options::kMinimizable, &minimizable);

  bool maximizable = true;
  options.Get(options::kMaximizable, &maximizable);

  bool closable = true;
  options.Get(options::kClosable, &closable);

  options.Get(options::kTitleBarStyle, &title_bar_style_);

  std::string windowType;
  options.Get(options::kType, &windowType);

  bool useStandardWindow = true;
  // eventually deprecate separate "standardWindow" option in favor of
  // standard / textured window types
  options.Get(options::kStandardWindow, &useStandardWindow);
  if (windowType == "textured") {
    useStandardWindow = false;
  }

  NSUInteger styleMask = NSTitledWindowMask;
  if (minimizable) {
    styleMask |= NSMiniaturizableWindowMask;
  }
  if (closable) {
    styleMask |= NSClosableWindowMask;
  }
  if (title_bar_style_ != NORMAL) {
    // The window without titlebar is treated the same with frameless window.
    set_has_frame(false);
  }
  if (!useStandardWindow || transparent() || !has_frame()) {
    styleMask |= NSTexturedBackgroundWindowMask;
  }
  if (resizable) {
    styleMask |= NSResizableWindowMask;
  }

  window_.reset([[AtomNSWindow alloc]
      initWithContentRect:cocoa_bounds
                styleMask:styleMask
                  backing:NSBackingStoreBuffered
                    defer:YES]);
  [window_ setShell:this];
  [window_ setEnableLargerThanScreen:enable_larger_than_screen()];

  window_delegate_.reset([[AtomNSWindowDelegate alloc] initWithShell:this]);
  [window_ setDelegate:window_delegate_];

  // Only use native parent window for non-modal windows.
  if (parent && !is_modal()) {
    SetParentWindow(parent);
  }

  if (transparent()) {
    // Setting the background color to clear will also hide the shadow.
    [window_ setBackgroundColor:[NSColor clearColor]];
  }

  if (windowType == "desktop") {
    [window_ setLevel:kCGDesktopWindowLevel - 1];
    [window_ setDisableKeyOrMainWindow:YES];
    [window_ setCollectionBehavior:
        (NSWindowCollectionBehaviorCanJoinAllSpaces |
         NSWindowCollectionBehaviorStationary |
         NSWindowCollectionBehaviorIgnoresCycle)];
  }

  bool focusable;
  if (options.Get(options::kFocusable, &focusable) && !focusable)
    [window_ setDisableKeyOrMainWindow:YES];

  if (transparent() || !has_frame()) {
    if (base::mac::IsOSYosemiteOrLater()) {
      // Don't show title bar.
      [window_ setTitleVisibility:NSWindowTitleHidden];
    }
    // Remove non-transparent corners, see http://git.io/vfonD.
    [window_ setOpaque:NO];
  }

  // We will manage window's lifetime ourselves.
  [window_ setReleasedWhenClosed:NO];

  // Hide the title bar.
  if (title_bar_style_ == HIDDEN_INSET) {
    if (base::mac::IsOSYosemiteOrLater()) {
      [window_ setTitlebarAppearsTransparent:YES];
      base::scoped_nsobject<NSToolbar> toolbar(
          [[NSToolbar alloc] initWithIdentifier:@"titlebarStylingToolbar"]);
      [toolbar setShowsBaselineSeparator:NO];
      [window_ setToolbar:toolbar];
    } else {
      [window_ enableWindowButtonsOffset];
      [window_ setWindowButtonsOffset:NSMakePoint(12, 10)];
    }
  }

  // On macOS the initial window size doesn't include window frame.
  bool use_content_size = false;
  options.Get(options::kUseContentSize, &use_content_size);
  if (!has_frame() || !use_content_size)
    SetSize(gfx::Size(width, height));

  options.Get(options::kZoomToPageWidth, &zoom_to_page_width_);

  // Enable the NSView to accept first mouse event.
  bool acceptsFirstMouse = false;
  options.Get(options::kAcceptFirstMouse, &acceptsFirstMouse);
  [window_ setAcceptsFirstMouse:acceptsFirstMouse];

  // Disable auto-hiding cursor.
  bool disableAutoHideCursor = false;
  options.Get(options::kDisableAutoHideCursor, &disableAutoHideCursor);
  [window_ setDisableAutoHideCursor:disableAutoHideCursor];

  NSView* view = inspectable_web_contents()->GetView()->GetNativeView();
  [view setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];

  // Use an NSEvent monitor to listen for the wheel event.
  BOOL __block began = NO;
  wheel_event_monitor_ = [NSEvent
    addLocalMonitorForEventsMatchingMask:NSScrollWheelMask
    handler:^(NSEvent* event) {
      if ([[event window] windowNumber] != [window_ windowNumber])
        return event;

      if (!web_contents)
        return event;

      if (!began && (([event phase] == NSEventPhaseMayBegin) ||
                                 ([event phase] == NSEventPhaseBegan))) {
        this->NotifyWindowScrollTouchBegin();
        began = YES;
      } else if (began && (([event phase] == NSEventPhaseEnded) ||
                           ([event phase] == NSEventPhaseCancelled))) {
        this->NotifyWindowScrollTouchEnd();
        began = NO;
      }
      return event;
  }];

  InstallView();

  std::string type;
  if (options.Get(options::kVibrancyType, &type)) {
    SetVibrancy(type);
  }

  // Set maximizable state last to ensure zoom button does not get reset
  // by calls to other APIs.
  SetMaximizable(maximizable);

  RegisterInputEventObserver(
      web_contents->GetWebContents()->GetRenderViewHost());
}

NativeWindowMac::~NativeWindowMac() {
  [NSEvent removeMonitor:wheel_event_monitor_];
  Observe(nullptr);
}

void NativeWindowMac::Close() {
  // When this is a sheet showing, performClose won't work.
  if (is_modal() && parent() && IsVisible()) {
    [parent()->GetNativeWindow() endSheet:window_];
    CloseImmediately();
    return;
  }

  if (!IsClosable()) {
    WindowList::WindowCloseCancelled(this);
    return;
  }

  [window_ performClose:nil];
}

void NativeWindowMac::CloseImmediately() {
  [window_ close];
}

void NativeWindowMac::Focus(bool focus) {
  if (!IsVisible())
    return;

  if (focus) {
    [[NSApplication sharedApplication] activateIgnoringOtherApps:YES];
    [window_ makeKeyAndOrderFront:nil];
  } else {
    [window_ orderBack:nil];
  }
}

bool NativeWindowMac::IsFocused() {
  return [window_ isKeyWindow];
}

void NativeWindowMac::Show() {
  if (is_modal() && parent()) {
    if ([window_ sheetParent] == nil)
      [parent()->GetNativeWindow() beginSheet:window_
                            completionHandler:^(NSModalResponse) {}];
    return;
  }

  // This method is supposed to put focus on window, however if the app does not
  // have focus then "makeKeyAndOrderFront" will only show the window.
  [NSApp activateIgnoringOtherApps:YES];

  [window_ makeKeyAndOrderFront:nil];
}

void NativeWindowMac::ShowInactive() {
  [window_ orderFrontRegardless];
}

void NativeWindowMac::Hide() {
  if (is_modal() && parent()) {
    [window_ orderOut:nil];
    [parent()->GetNativeWindow() endSheet:window_];
    return;
  }

  [window_ orderOut:nil];
}

bool NativeWindowMac::IsVisible() {
  return [window_ isVisible];
}

bool NativeWindowMac::IsEnabled() {
  return [window_ attachedSheet] == nil;
}

void NativeWindowMac::Maximize() {
  if (IsMaximized())
    return;

  [window_ zoom:nil];
}

void NativeWindowMac::Unmaximize() {
  if (!IsMaximized())
    return;

  [window_ zoom:nil];
}

bool NativeWindowMac::IsMaximized() {
  if (([window_ styleMask] & NSResizableWindowMask) != 0) {
    return [window_ isZoomed];
  } else {
    NSRect rectScreen = [[NSScreen mainScreen] visibleFrame];
    NSRect rectWindow = [window_ frame];
    return (rectScreen.origin.x == rectWindow.origin.x &&
            rectScreen.origin.y == rectWindow.origin.y &&
            rectScreen.size.width == rectWindow.size.width &&
            rectScreen.size.height == rectWindow.size.height);
  }
}

void NativeWindowMac::Minimize() {
  [window_ miniaturize:nil];
}

void NativeWindowMac::Restore() {
  [window_ deminiaturize:nil];
}

bool NativeWindowMac::IsMinimized() {
  return [window_ isMiniaturized];
}

void NativeWindowMac::SetFullScreen(bool fullscreen) {
  if (fullscreen == IsFullscreen())
    return;

  [window_ toggleFullScreen:nil];
}

bool NativeWindowMac::IsFullscreen() const {
  return [window_ styleMask] & NSFullScreenWindowMask;
}

void NativeWindowMac::SetBounds(const gfx::Rect& bounds, bool animate) {
  // Do nothing if in fullscreen mode.
  if (IsFullscreen())
    return;

  // Check size constraints since setFrame does not check it.
  gfx::Size size = bounds.size();
  size.SetToMax(GetMinimumSize());
  gfx::Size max_size = GetMaximumSize();
  if (!max_size.IsEmpty())
    size.SetToMin(max_size);

  NSRect cocoa_bounds = NSMakeRect(bounds.x(), 0, size.width(), size.height());
  // Flip coordinates based on the primary screen.
  NSScreen* screen = [[NSScreen screens] firstObject];
  cocoa_bounds.origin.y =
      NSHeight([screen frame]) - size.height() - bounds.y();

  [window_ setFrame:cocoa_bounds display:YES animate:animate];
}

gfx::Rect NativeWindowMac::GetBounds() {
  NSRect frame = [window_ frame];
  gfx::Rect bounds(frame.origin.x, 0, NSWidth(frame), NSHeight(frame));
  NSScreen* screen = [[NSScreen screens] firstObject];
  bounds.set_y(NSHeight([screen frame]) - NSMaxY(frame));
  return bounds;
}

void NativeWindowMac::SetContentSizeConstraints(
    const extensions::SizeConstraints& size_constraints) {
  auto convertSize = [this](const gfx::Size& size) {
    // Our frameless window still has titlebar attached, so setting contentSize
    // will result in actual content size being larger.
    if (!has_frame()) {
      NSRect frame = NSMakeRect(0, 0, size.width(), size.height());
      NSRect content = [window_ contentRectForFrameRect:frame];
      return content.size;
    } else {
      return NSMakeSize(size.width(), size.height());
    }
  };

  NSView* content = [window_ contentView];
  if (size_constraints.HasMinimumSize()) {
    NSSize min_size = convertSize(size_constraints.GetMinimumSize());
    [window_ setContentMinSize:[content convertSize:min_size toView:nil]];
  }
  if (size_constraints.HasMaximumSize()) {
    NSSize max_size = convertSize(size_constraints.GetMaximumSize());
    [window_ setContentMaxSize:[content convertSize:max_size toView:nil]];
  }
  NativeWindow::SetContentSizeConstraints(size_constraints);
}

void NativeWindowMac::SetResizable(bool resizable) {
  SetStyleMask(resizable, NSResizableWindowMask);
}

bool NativeWindowMac::IsResizable() {
  return [window_ styleMask] & NSResizableWindowMask;
}

void NativeWindowMac::SetAspectRatio(double aspect_ratio,
                                     const gfx::Size& extra_size) {
  NativeWindow::SetAspectRatio(aspect_ratio, extra_size);

  // Reset the behaviour to default if aspect_ratio is set to 0 or less.
  if (aspect_ratio > 0.0)
    [window_ setAspectRatio:NSMakeSize(aspect_ratio, 1.0)];
  else
    [window_ setResizeIncrements:NSMakeSize(1.0, 1.0)];
}

void NativeWindowMac::PreviewFile(const std::string& path,
                                  const std::string& display_name) {
  NSString* path_ns = [NSString stringWithUTF8String:path.c_str()];
  NSString* name_ns = [NSString stringWithUTF8String:display_name.c_str()];
  [window_ previewFileAtPath:path_ns withName:name_ns];
}

void NativeWindowMac::CloseFilePreview() {
  if ([QLPreviewPanel sharedPreviewPanelExists]) {
    [[QLPreviewPanel sharedPreviewPanel] close];
  }
}

void NativeWindowMac::SetMovable(bool movable) {
  [window_ setMovable:movable];
}

bool NativeWindowMac::IsMovable() {
  return [window_ isMovable];
}

void NativeWindowMac::SetMinimizable(bool minimizable) {
  SetStyleMask(minimizable, NSMiniaturizableWindowMask);
}

bool NativeWindowMac::IsMinimizable() {
  return [window_ styleMask] & NSMiniaturizableWindowMask;
}

void NativeWindowMac::SetMaximizable(bool maximizable) {
  [[window_ standardWindowButton:NSWindowZoomButton] setEnabled:maximizable];
}

bool NativeWindowMac::IsMaximizable() {
  return [[window_ standardWindowButton:NSWindowZoomButton] isEnabled];
}

void NativeWindowMac::SetFullScreenable(bool fullscreenable) {
  SetCollectionBehavior(
      fullscreenable, NSWindowCollectionBehaviorFullScreenPrimary);
  // On EL Capitan this flag is required to hide fullscreen button.
  SetCollectionBehavior(
      !fullscreenable, NSWindowCollectionBehaviorFullScreenAuxiliary);
}

bool NativeWindowMac::IsFullScreenable() {
  NSUInteger collectionBehavior = [window_ collectionBehavior];
  return collectionBehavior & NSWindowCollectionBehaviorFullScreenPrimary;
}

void NativeWindowMac::SetClosable(bool closable) {
  SetStyleMask(closable, NSClosableWindowMask);
}

bool NativeWindowMac::IsClosable() {
  return [window_ styleMask] & NSClosableWindowMask;
}

void NativeWindowMac::SetAlwaysOnTop(bool top, const std::string& level) {
  int windowLevel = NSNormalWindowLevel;
  if (top) {
    if (level == "floating") {
      windowLevel = NSFloatingWindowLevel;
    } else if (level == "torn-off-menu") {
      windowLevel = NSTornOffMenuWindowLevel;
    } else if (level == "modal-panel") {
      windowLevel = NSModalPanelWindowLevel;
    } else if (level == "main-menu") {
      windowLevel = NSMainMenuWindowLevel;
    } else if (level == "status") {
      windowLevel = NSStatusWindowLevel;
    } else if (level == "pop-up-menu") {
      windowLevel = NSPopUpMenuWindowLevel;
    } else if (level == "screen-saver") {
      windowLevel = NSScreenSaverWindowLevel;
    } else if (level == "dock") {
      // Deprecated by macOS, but kept for backwards compatibility
      windowLevel = NSDockWindowLevel;
    }
  }
  [window_ setLevel:windowLevel];
}

bool NativeWindowMac::IsAlwaysOnTop() {
  return [window_ level] != NSNormalWindowLevel;
}

void NativeWindowMac::Center() {
  [window_ center];
}

void NativeWindowMac::SetTitle(const std::string& title) {
  // For macOS <= 10.9, the setTitleVisibility API is not available, we have
  // to avoid calling setTitle for frameless window.
  if (!base::mac::IsOSYosemiteOrLater() && (transparent() || !has_frame()))
    return;

  [window_ setTitle:base::SysUTF8ToNSString(title)];
}

std::string NativeWindowMac::GetTitle() {
  return base::SysNSStringToUTF8([window_ title]);;
}

void NativeWindowMac::FlashFrame(bool flash) {
  if (flash) {
    attention_request_id_ = [NSApp requestUserAttention:NSInformationalRequest];
  } else {
    [NSApp cancelUserAttentionRequest:attention_request_id_];
    attention_request_id_ = 0;
  }
}

void NativeWindowMac::SetSkipTaskbar(bool skip) {
}

void NativeWindowMac::SetKiosk(bool kiosk) {
  if (kiosk && !is_kiosk_) {
    kiosk_options_ = [NSApp currentSystemPresentationOptions];
    NSApplicationPresentationOptions options =
        NSApplicationPresentationHideDock +
        NSApplicationPresentationHideMenuBar +
        NSApplicationPresentationDisableAppleMenu +
        NSApplicationPresentationDisableProcessSwitching +
        NSApplicationPresentationDisableForceQuit +
        NSApplicationPresentationDisableSessionTermination +
        NSApplicationPresentationDisableHideApplication;
    [NSApp setPresentationOptions:options];
    is_kiosk_ = true;
    was_fullscreen_ = IsFullscreen();
    if (!was_fullscreen_) SetFullScreen(true);
  } else if (!kiosk && is_kiosk_) {
    is_kiosk_ = false;
    if (!was_fullscreen_) SetFullScreen(false);
    [NSApp setPresentationOptions:kiosk_options_];
  }
}

bool NativeWindowMac::IsKiosk() {
  return is_kiosk_;
}

void NativeWindowMac::SetBackgroundColor(const std::string& color_name) {
  SkColor color = ParseHexColor(color_name);
  base::ScopedCFTypeRef<CGColorRef> cgcolor(
      skia::CGColorCreateFromSkColor(color));
  [[[window_ contentView] layer] setBackgroundColor:cgcolor];

  const auto view = web_contents()->GetRenderWidgetHostView();
  if (view)
    view->SetBackgroundColor(color);
}

void NativeWindowMac::SetHasShadow(bool has_shadow) {
  [window_ setHasShadow:has_shadow];
}

bool NativeWindowMac::HasShadow() {
  return [window_ hasShadow];
}

void NativeWindowMac::SetRepresentedFilename(const std::string& filename) {
  [window_ setRepresentedFilename:base::SysUTF8ToNSString(filename)];
}

std::string NativeWindowMac::GetRepresentedFilename() {
  return base::SysNSStringToUTF8([window_ representedFilename]);
}

void NativeWindowMac::SetDocumentEdited(bool edited) {
  [window_ setDocumentEdited:edited];
}

bool NativeWindowMac::IsDocumentEdited() {
  return [window_ isDocumentEdited];
}

void NativeWindowMac::SetIgnoreMouseEvents(bool ignore) {
  [window_ setIgnoresMouseEvents:ignore];
}

void NativeWindowMac::SetContentProtection(bool enable) {
  [window_ setSharingType:enable ? NSWindowSharingNone
                                 : NSWindowSharingReadOnly];
}

void NativeWindowMac::SetParentWindow(NativeWindow* parent) {
  if (is_modal())
    return;

  NativeWindow::SetParentWindow(parent);

  // Remove current parent window.
  if ([window_ parentWindow])
    [[window_ parentWindow] removeChildWindow:window_];

  // Set new current window.
  if (parent)
    [parent->GetNativeWindow() addChildWindow:window_ ordered:NSWindowAbove];
}

gfx::NativeWindow NativeWindowMac::GetNativeWindow() {
  return window_;
}

gfx::AcceleratedWidget NativeWindowMac::GetAcceleratedWidget() {
  return inspectable_web_contents()->GetView()->GetNativeView();
}

void NativeWindowMac::SetProgressBar(double progress, const NativeWindow::ProgressState state) {
  NSDockTile* dock_tile = [NSApp dockTile];

  // For the first time API invoked, we need to create a ContentView in DockTile.
  if (dock_tile.contentView == NULL) {
    NSImageView* image_view = [[NSImageView alloc] init];
    [image_view setImage:[NSApp applicationIconImage]];
    [dock_tile setContentView:image_view];
  }

  if ([[dock_tile.contentView subviews] count] == 0) {
    NSProgressIndicator* progress_indicator = [[AtomProgressBar alloc]
        initWithFrame:NSMakeRect(0.0f, 0.0f, dock_tile.size.width, 15.0)];
    [progress_indicator setStyle:NSProgressIndicatorBarStyle];
    [progress_indicator setIndeterminate:NO];
    [progress_indicator setBezeled:YES];
    [progress_indicator setMinValue:0];
    [progress_indicator setMaxValue:1];
    [progress_indicator setHidden:NO];
    [dock_tile.contentView addSubview:progress_indicator];
  }

  NSProgressIndicator* progress_indicator =
      static_cast<NSProgressIndicator*>([[[dock_tile contentView] subviews]
           objectAtIndex:0]);
  if (progress < 0) {
    [progress_indicator setHidden:YES];
  } else if (progress > 1) {
    [progress_indicator setHidden:NO];
    [progress_indicator setIndeterminate:YES];
    [progress_indicator setDoubleValue:1];
  } else {
    [progress_indicator setHidden:NO];
    [progress_indicator setDoubleValue:progress];
  }
  [dock_tile display];
}

void NativeWindowMac::SetOverlayIcon(const gfx::Image& overlay,
                                     const std::string& description) {
}

void NativeWindowMac::SetVisibleOnAllWorkspaces(bool visible) {
  SetCollectionBehavior(visible, NSWindowCollectionBehaviorCanJoinAllSpaces);
}

bool NativeWindowMac::IsVisibleOnAllWorkspaces() {
  NSUInteger collectionBehavior = [window_ collectionBehavior];
  return collectionBehavior & NSWindowCollectionBehaviorCanJoinAllSpaces;
}

void NativeWindowMac::SetAutoHideCursor(bool auto_hide) {
  [window_ setDisableAutoHideCursor:!auto_hide];
}

void NativeWindowMac::SetVibrancy(const std::string& type) {
  if (!base::mac::IsOSYosemiteOrLater()) return;

  NSView* vibrant_view = [window_ vibrantView];

  if (type.empty()) {
    if (vibrant_view == nil) return;

    [vibrant_view removeFromSuperview];
    [window_ setVibrantView:nil];

    return;
  }

  NSVisualEffectView* effect_view = (NSVisualEffectView*)vibrant_view;
  if (effect_view == nil) {
    effect_view = [[[NSVisualEffectView alloc]
        initWithFrame: [[window_ contentView] bounds]] autorelease];
    [window_ setVibrantView:(NSView*)effect_view];

    [effect_view setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
    [effect_view setBlendingMode:NSVisualEffectBlendingModeBehindWindow];
    [effect_view setState:NSVisualEffectStateActive];
    [[window_ contentView] addSubview:effect_view
                           positioned:NSWindowBelow
                           relativeTo:nil];
  }

  NSVisualEffectMaterial vibrancyType = NSVisualEffectMaterialLight;

  if (type == "appearance-based") {
    vibrancyType = NSVisualEffectMaterialAppearanceBased;
  } else if (type == "light") {
    vibrancyType = NSVisualEffectMaterialLight;
  } else if (type == "dark") {
    vibrancyType = NSVisualEffectMaterialDark;
  } else if (type == "titlebar") {
    vibrancyType = NSVisualEffectMaterialTitlebar;
  }

  if (base::mac::IsOSElCapitanOrLater()) {
    // TODO(kevinsawicki): Use NSVisualEffectMaterial* constants directly once
    // they are available in the minimum SDK version
    if (type == "selection") {
      // NSVisualEffectMaterialSelection
      vibrancyType = (NSVisualEffectMaterial) 4;
    } else if (type == "menu") {
      // NSVisualEffectMaterialMenu
      vibrancyType = (NSVisualEffectMaterial) 5;
    } else if (type == "popover") {
      // NSVisualEffectMaterialPopover
      vibrancyType = (NSVisualEffectMaterial) 6;
    } else if (type == "sidebar") {
      // NSVisualEffectMaterialSidebar
      vibrancyType = (NSVisualEffectMaterial) 7;
    } else if (type == "medium-light") {
      // NSVisualEffectMaterialMediumLight
      vibrancyType = (NSVisualEffectMaterial) 8;
    } else if (type == "ultra-dark") {
      // NSVisualEffectMaterialUltraDark
      vibrancyType = (NSVisualEffectMaterial) 9;
    }
  }

  [effect_view setMaterial:vibrancyType];
}

void NativeWindowMac::OnInputEvent(const blink::WebInputEvent& event) {
  switch (event.type) {
    case blink::WebInputEvent::GestureScrollBegin:
    case blink::WebInputEvent::GestureScrollUpdate:
    case blink::WebInputEvent::GestureScrollEnd:
        this->NotifyWindowScrollTouchEdge();
      break;
    default:
      break;
  }
}

void NativeWindowMac::RenderViewHostChanged(
    content::RenderViewHost* old_host,
    content::RenderViewHost* new_host) {
  UnregisterInputEventObserver(old_host);
  RegisterInputEventObserver(new_host);
}

std::vector<gfx::Rect> NativeWindowMac::CalculateNonDraggableRegions(
    const std::vector<DraggableRegion>& regions, int width, int height) {
  std::vector<gfx::Rect> result;
  if (regions.empty()) {
    result.push_back(gfx::Rect(0, 0, width, height));
  } else {
    std::unique_ptr<SkRegion> draggable(DraggableRegionsToSkRegion(regions));
    std::unique_ptr<SkRegion> non_draggable(new SkRegion);
    non_draggable->op(0, 0, width, height, SkRegion::kUnion_Op);
    non_draggable->op(*draggable, SkRegion::kDifference_Op);
    for (SkRegion::Iterator it(*non_draggable); !it.done(); it.next()) {
      result.push_back(gfx::SkIRectToRect(it.rect()));
    }
  }
  return result;
}

gfx::Rect NativeWindowMac::ContentBoundsToWindowBounds(
    const gfx::Rect& bounds) {
  if (has_frame()) {
    gfx::Rect window_bounds(
        [window_ frameRectForContentRect:bounds.ToCGRect()]);
    int frame_height = window_bounds.height() - bounds.height();
    window_bounds.set_y(window_bounds.y() - frame_height);
    return window_bounds;
  } else {
    return bounds;
  }
}

gfx::Rect NativeWindowMac::WindowBoundsToContentBounds(
    const gfx::Rect& bounds) {
  if (has_frame()) {
    gfx::Rect content_bounds(
        [window_ contentRectForFrameRect:bounds.ToCGRect()]);
    int frame_height = bounds.height() - content_bounds.height();
    content_bounds.set_y(content_bounds.y() + frame_height);
    return content_bounds;
  } else {
    return bounds;
  }
}

void NativeWindowMac::UpdateDraggableRegions(
    const std::vector<DraggableRegion>& regions) {
  NativeWindow::UpdateDraggableRegions(regions);
  draggable_regions_ = regions;
  UpdateDraggableRegionViews(regions);
}

void NativeWindowMac::ShowWindowButton(NSWindowButton button) {
  auto view = [window_ standardWindowButton:button];
  [view.superview addSubview:view positioned:NSWindowAbove relativeTo:nil];
}

void NativeWindowMac::InstallView() {
  // Make sure the bottom corner is rounded for non-modal windows: http://crbug.com/396264.
  // But do not enable it on OS X 10.9 for transparent window, otherwise a
  // semi-transparent frame would show.
  if (!(transparent() && base::mac::IsOSMavericks()) && !is_modal())
    [[window_ contentView] setWantsLayer:YES];

  NSView* view = inspectable_web_contents()->GetView()->GetNativeView();
  if (has_frame()) {
    [view setFrame:[[window_ contentView] bounds]];
    [[window_ contentView] addSubview:view];
  } else {
    // In OSX 10.10, adding subviews to the root view for the NSView hierarchy
    // produces warnings. To eliminate the warnings, we resize the contentView
    // to fill the window, and add subviews to that.
    // http://crbug.com/380412
    content_view_.reset([[FullSizeContentView alloc] init]);
    [content_view_
        setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
    [content_view_ setFrame:[[[window_ contentView] superview] bounds]];
    [window_ setContentView:content_view_];

    [view setFrame:[content_view_ bounds]];
    [content_view_ addSubview:view];

    // The fullscreen button should always be hidden for frameless window.
    [[window_ standardWindowButton:NSWindowFullScreenButton] setHidden:YES];

    if (title_bar_style_ != NORMAL) {
      if (base::mac::IsOSMavericks()) {
        ShowWindowButton(NSWindowZoomButton);
        ShowWindowButton(NSWindowMiniaturizeButton);
        ShowWindowButton(NSWindowCloseButton);
      }

      return;
    }

    // Hide the window buttons.
    [[window_ standardWindowButton:NSWindowZoomButton] setHidden:YES];
    [[window_ standardWindowButton:NSWindowMiniaturizeButton] setHidden:YES];
    [[window_ standardWindowButton:NSWindowCloseButton] setHidden:YES];

    // Some third-party macOS utilities check the zoom button's enabled state to
    // determine whether to show custom UI on hover, so we disable it here to
    // prevent them from doing so in a frameless app window.
    [[window_ standardWindowButton:NSWindowZoomButton] setEnabled:NO];
  }
}

void NativeWindowMac::UninstallView() {
  NSView* view = inspectable_web_contents()->GetView()->GetNativeView();
  [view removeFromSuperview];
}

void NativeWindowMac::UpdateDraggableRegionViews(
    const std::vector<DraggableRegion>& regions) {
  if (has_frame())
    return;

  // All ControlRegionViews should be added as children of the WebContentsView,
  // because WebContentsView will be removed and re-added when entering and
  // leaving fullscreen mode.
  NSView* webView = web_contents()->GetNativeView();
  NSInteger webViewWidth = NSWidth([webView bounds]);
  NSInteger webViewHeight = NSHeight([webView bounds]);

  if ([webView respondsToSelector:@selector(setMouseDownCanMoveWindow:)]) {
    [webView setMouseDownCanMoveWindow:YES];
  }

  // Remove all ControlRegionViews that are added last time.
  // Note that [webView subviews] returns the view's mutable internal array and
  // it should be copied to avoid mutating the original array while enumerating
  // it.
  base::scoped_nsobject<NSArray> subviews([[webView subviews] copy]);
  for (NSView* subview in subviews.get())
    if ([subview isKindOfClass:[ControlRegionView class]])
      [subview removeFromSuperview];

  // Draggable regions is implemented by having the whole web view draggable
  // (mouseDownCanMoveWindow) and overlaying regions that are not draggable.
  std::vector<gfx::Rect> system_drag_exclude_areas =
      CalculateNonDraggableRegions(regions, webViewWidth, webViewHeight);

  // Create and add a ControlRegionView for each region that needs to be
  // excluded from the dragging.
  for (std::vector<gfx::Rect>::const_iterator iter =
           system_drag_exclude_areas.begin();
       iter != system_drag_exclude_areas.end();
       ++iter) {
    base::scoped_nsobject<NSView> controlRegion(
        [[ControlRegionView alloc] initWithFrame:NSZeroRect]);
    [controlRegion setFrame:NSMakeRect(iter->x(),
                                       webViewHeight - iter->bottom(),
                                       iter->width(),
                                       iter->height())];
    [webView addSubview:controlRegion];
  }

  // AppKit will not update its cache of mouseDownCanMoveWindow unless something
  // changes. Previously we tried adding an NSView and removing it, but for some
  // reason it required reposting the mouse-down event, and didn't always work.
  // Calling the below seems to be an effective solution.
  [window_ setMovableByWindowBackground:NO];
  [window_ setMovableByWindowBackground:YES];
}

void NativeWindowMac::SetStyleMask(bool on, NSUInteger flag) {
  // Changing the styleMask of a frameless windows causes it to change size so
  // we explicitly disable resizing while setting it.
  ScopedDisableResize disable_resize;

  bool was_maximizable = IsMaximizable();
  if (on)
    [window_ setStyleMask:[window_ styleMask] | flag];
  else
    [window_ setStyleMask:[window_ styleMask] & (~flag)];
  // Change style mask will make the zoom button revert to default, probably
  // a bug of Cocoa or macOS.
  SetMaximizable(was_maximizable);
}

void NativeWindowMac::SetCollectionBehavior(bool on, NSUInteger flag) {
  bool was_maximizable = IsMaximizable();
  if (on)
    [window_ setCollectionBehavior:[window_ collectionBehavior] | flag];
  else
    [window_ setCollectionBehavior:[window_ collectionBehavior] & (~flag)];
  // Change collectionBehavior will make the zoom button revert to default,
  // probably a bug of Cocoa or macOS.
  SetMaximizable(was_maximizable);
}

void NativeWindowMac::RegisterInputEventObserver(
    content::RenderViewHost* host) {
  if (host)
    host->GetWidget()->AddInputEventObserver(this);
}

void NativeWindowMac::UnregisterInputEventObserver(
    content::RenderViewHost* host) {
  if (host)
    host->GetWidget()->RemoveInputEventObserver(this);
}

// static
NativeWindow* NativeWindow::Create(
    brightray::InspectableWebContents* inspectable_web_contents,
    const mate::Dictionary& options,
    NativeWindow* parent) {
  return new NativeWindowMac(inspectable_web_contents, options, parent);
}

}  // namespace atom