wails/v3/pkg/application/systemtray_darwin.m

//go:build darwin

#include "Cocoa/Cocoa.h"
#include "menuitem_darwin.h"
#include "systemtray_darwin.h"

extern void systrayClickCallback(long, int);

// StatusItemController.m
@implementation StatusItemController

- (void)statusItemClicked:(id)sender {
	NSEvent *event = [NSApp currentEvent];
	systrayClickCallback(self.id, event.type);
}

@end

// Create a new system tray
void* systemTrayNew(long id) {
	StatusItemController *controller = [[StatusItemController alloc] init];
	controller.id = id;
	NSStatusItem *statusItem = [[[NSStatusBar systemStatusBar] statusItemWithLength:NSVariableStatusItemLength] retain];
	[statusItem setTarget:controller];
	[statusItem setAction:@selector(statusItemClicked:)];
	NSButton *button = statusItem.button;
	[button sendActionOn:(NSEventMaskLeftMouseDown|NSEventMaskRightMouseDown)];
	return (void*)statusItem;
}

void systemTraySetLabel(void* nsStatusItem, char *label) {
	if( label == NULL ) {
		return;
	}
	// Set the label on the main thread
	dispatch_async(dispatch_get_main_queue(), ^{
		NSStatusItem *statusItem = (NSStatusItem *)nsStatusItem;
		statusItem.button.title = [NSString stringWithUTF8String:label];
		free(label);
	});
}

void systemTraySetANSILabel(void* nsStatusItem, void* label) {
    if( label == NULL ) {
        return;
    }

    NSMutableAttributedString* attributedString = (NSMutableAttributedString*) label;

    // Set the label
    NSStatusItem *statusItem = (NSStatusItem *)nsStatusItem;
    [statusItem setAttributedTitle:attributedString];
    // [attributedString release];
}

void* appendAttributedString(void *currentString, char *title, char *FG, char *BG) {

    NSMutableAttributedString* newString = createAttributedString(title, FG, BG);
    if( currentString != NULL ) {
        NSMutableAttributedString* current = (NSMutableAttributedString*)currentString;
        [current appendAttributedString:newString];
        newString = current;
    }

    return (void*)newString;
}

void* createAttributedString(char *title, char *FG, char *BG) {

    NSMutableDictionary *dictionary = [NSMutableDictionary new];

    // RGBA
    if(FG != NULL && strlen(FG) > 0) {
        unsigned short r, g, b, a;

        // white by default
        r = g = b = a = 255;
        int count = sscanf(FG, "#%02hx%02hx%02hx%02hx", &r, &g, &b, &a);
        if (count > 0) {
            NSColor *colour = [NSColor colorWithCalibratedRed:(CGFloat)r / 255.0
                                                         green:(CGFloat)g / 255.0
                                                          blue:(CGFloat)b / 255.0
                                                         alpha:(CGFloat)a / 255.0];
            dictionary[NSForegroundColorAttributeName] = colour;

        }
    }

    // Calculate BG colour
    if(BG != NULL && strlen(BG) > 0) {
            unsigned short r, g, b, a;

            // white by default
            r = g = b = a = 255;
            int count = sscanf(BG, "#%02hx%02hx%02hx%02hx", &r, &g, &b, &a);
            if (count > 0) {
                NSColor *colour = [NSColor colorWithCalibratedRed:(CGFloat)r / 255.0
                                                             green:(CGFloat)g / 255.0
                                                              blue:(CGFloat)b / 255.0
                                                             alpha:(CGFloat)a / 255.0];
                dictionary[NSBackgroundColorAttributeName] = colour;
            }
    }
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithUTF8String:title] attributes:dictionary];
    return (void*)attributedString;
}

// Create an nsimage from a byte array
NSImage* imageFromBytes(const unsigned char *bytes, int length) {
	NSData *data = [NSData dataWithBytes:bytes length:length];
	NSImage *image = [[NSImage alloc] initWithData:data];
	return image;
}

// Set the icon on the system tray
void systemTraySetIcon(void* nsStatusItem, void* nsImage, int position, bool isTemplate) {
	// Set the icon on the main thread
	dispatch_async(dispatch_get_main_queue(), ^{
		NSStatusItem *statusItem = (NSStatusItem *)nsStatusItem;
		NSImage *image = (NSImage *)nsImage;

		NSStatusBar *statusBar = [NSStatusBar systemStatusBar];
		CGFloat thickness = [statusBar thickness];
		[image setSize:NSMakeSize(thickness, thickness)];
		if( isTemplate ) {
			[image setTemplate:YES];
		}
		statusItem.button.image = [image autorelease];
		statusItem.button.imagePosition = position;
	});
}

// Add menu to system tray
void systemTraySetMenu(void* nsStatusItem, void* nsMenu) {
	// Set the menu on the main thread
	dispatch_async(dispatch_get_main_queue(), ^{
		NSStatusItem *statusItem = (NSStatusItem *)nsStatusItem;
		NSMenu *menu = (NSMenu *)nsMenu;
		statusItem.menu = menu;
	});
}

// Destroy system tray
void systemTrayDestroy(void* nsStatusItem) {
	// Remove the status item from the status bar and its associated menu
	dispatch_async(dispatch_get_main_queue(), ^{
		NSStatusItem *statusItem = (NSStatusItem *)nsStatusItem;
		[[NSStatusBar systemStatusBar] removeStatusItem:statusItem];
		[statusItem release];
	});
}

void showMenu(void* nsStatusItem, void *nsMenu) {
	// Show the menu on the main thread
	dispatch_async(dispatch_get_main_queue(), ^{
		NSStatusItem *statusItem = (NSStatusItem *)nsStatusItem;
		[statusItem popUpStatusItemMenu:(NSMenu *)nsMenu];
        // Post a mouse up event so the statusitem defocuses
        NSEvent *event = [NSEvent mouseEventWithType:NSEventTypeLeftMouseUp
                                            location:[NSEvent mouseLocation]
                                       modifierFlags:0
                                           timestamp:[[NSProcessInfo processInfo] systemUptime]
                                        windowNumber:0
                                             context:nil
                                         eventNumber:0
                                          clickCount:1
                                            pressure:1];
        [NSApp postEvent:event atStart:NO];
        [statusItem.button highlight:NO];
	});
}

void systemTrayGetBounds(void* nsStatusItem, NSRect *rect) {
	NSStatusItem *statusItem = (NSStatusItem *)nsStatusItem;
	NSRect buttonFrame = statusItem.button.frame;
	*rect = [statusItem.button.window convertRectToScreen:buttonFrame];
}

int statusBarHeight() {
    NSMenu *mainMenu = [NSApp mainMenu];
    CGFloat menuBarHeight = [mainMenu menuBarHeight];
    return (int)menuBarHeight;
}