@interface NSCollectionView : NSView

// 为收集视图提供数据的对象
@property (nullable, weak) id<NSCollectionViewDataSource> dataSource API_AVAILABLE(macos(10.11)); 
@property (nullable, weak) id<NSCollectionViewPrefetching> prefetchDataSource API_AVAILABLE(macos(10.13));
// 委托对象
@property (nullable, weak) id<NSCollectionViewDelegate> delegate;
// 为收集视图提供数据的数组
@property (copy) NSArray<id> *content;
@property (nullable, strong) NSView *backgroundView API_AVAILABLE(macos(10.11));
// 背景色数组
@property (null_resettable, copy) NSArray<NSColor *> *backgroundColors;
// 背景视图是否随项目及其他内容滚动
@property BOOL backgroundViewScrollsWithContent API_AVAILABLE(macos(10.12));
// 构建集合视图内容的布局对象
@property (nullable, strong) __kindof NSCollectionViewLayout *collectionViewLayout API_AVAILABLE(macos(10.11));

//  FSWindowCtl.m
@interface FSWindowCtl ()<NSWindowDelegate>
	
@end

@implementation FSWindowCtl

- (void)windowDidLoad {
    [super windowDidLoad];
    [self settingWindowStyle];
}
// 设置window样式
- (void)settingWindowStyle {
    self.window.titlebarAppearsTransparent = YES;
    self.window.titleVisibility = NSWindowTitleHidden;
    self.window.styleMask = NSWindowStyleMaskClosable | NSWindowStyleMaskResizable | NSWindowStyleMaskTitled | NSWindowStyleMaskMiniaturizable | NSWindowStyleMaskFullSizeContentView;
    [self.window setMovableByWindowBackground:YES];
    [self updateTitleBarOfWindow:NO];
}

// 修改关闭、最小化、全屏的位置
- (void)updateTitleBarOfWindow:(BOOL)fullScreen {
    CGFloat kTitlebarH = 54.0;
    CGFloat kFullScreenButtonYOrigin = 3.0;
    NSRect windowFrame = self.window.frame;
    NSView *titlebarContainerView = [self.window standardWindowButton:NSWindowCloseButton].superview.superview;
    NSRect titlebarContainerFrame = titlebarContainerView.frame;
    titlebarContainerFrame.origin.y = windowFrame.size.height - kTitlebarH;
    titlebarContainerFrame.size.height = (CGFloat)kTitlebarH;
    titlebarContainerView.frame = titlebarContainerFrame;
    
    CGFloat buttonX = 12.0;
    NSButton *closeBtn = [self.window standardWindowButton:NSWindowCloseButton];
    NSButton *minimizeBtn = [self.window standardWindowButton:NSWindowMiniaturizeButton];
    NSButton *zoomBtn = [self.window standardWindowButton:NSWindowZoomButton];
    
    for (NSButton *buttonView in @[closeBtn, minimizeBtn, zoomBtn]) {
        NSRect buttonFrame = buttonView.frame;
        buttonFrame.origin.y = fullScreen ? kFullScreenButtonYOrigin : round((kTitlebarH - buttonFrame.size.height)/2.0);
        buttonFrame.origin.x = (CGFloat)buttonX;
        buttonX = buttonFrame.size.width + buttonX + 6;
        [buttonView setFrameOrigin:buttonFrame.origin];
    }
}

#pragma mark - NSWindowDelegate
- (void)windowDidEnterFullScreen:(NSNotification *)notification {
    [self updateTitleBarOfWindow:YES];
}

- (void)windowDidExitFullScreen:(NSNotification *)notification {
    [self updateTitleBarOfWindow:NO];
}

- (void)windowDidResize:(NSNotification *)notification {
    [self updateTitleBarOfWindow:NO];
}

@end