Cross-platform, single header, super tiny C99 implementation of a system tray icon with a popup menu.
Works well on:
- Linux/Gtk (libappindicator)
- Windows XP or newer (shellapi.h)
- MacOS (Cocoa/AppKit)
There is also a stub implementation that returns errors on attempt to create a tray menu.
Before you can compile tray, you'll need to add an environment definition before the line where you include tray.h.
For Windows:
#include <stdio.h>
#include <string.h>
#define TRAY_WINAPI 1
#include "tray.h"
...For Linux:
#include <stdio.h>
#include <string.h>
#define TRAY_APPINDICATOR 1
#include "tray.h"
...For Mac:
#include <stdio.h>
#include <string.h>
#define TRAY_APPKIT 1
#include "tray.h"
...The included example .c files can be compiled based on your environment.
For example, to compile and run the program on Windows:
$> gcc example_windows.c [Enter]This will compile and build a.out. To run it:
$> a [Enter]
struct tray tray = {
.icon = "icon.png",
.menu = (struct tray_menu[]){{"Toggle me", 0, 0, toggle_cb, NULL},
{"-", 0, 0, NULL, NULL},
{"Quit", 0, 0, quit_cb, NULL},
{NULL, 0, 0, NULL, NULL}},
};
void toggle_cb(struct tray_menu *item) {
item->checked = !item->checked;
tray_update(&tray);
}
void quit_cb(struct tray_menu *item) {
tray_exit();
}
...
tray_init(&tray);
while (tray_loop(1) == 0);
tray_exit();Tray structure defines an icon and a menu. Menu is a NULL-terminated array of items. Menu item defines menu text, menu checked and disabled (grayed) flags and a callback with some optional context pointer.
struct tray {
char *icon;
struct tray_menu *menu;
};
struct tray_menu {
char *text;
int disabled;
int checked;
void (*cb)(struct tray_menu *);
void *context;
struct tray_menu *submenu;
};int tray_init(struct tray *)- creates tray icon. Returns -1 if tray icon/menu can't be created.void tray_update(struct tray *)- updates tray icon and menu.int tray_loop(int blocking)- runs one iteration of the UI loop. Returns -1 iftray_exit()has been called.void tray_exit()- terminates UI loop.
All functions are meant to be called from the UI thread only.
Menu arrays must be terminated with a NULL item, e.g. the last item in the array must have text field set to NULL.
- Cross-platform tray icon
- Cross-platform tray popup menu
- Separators in the menu
- Disabled/enabled menu items
- Checked/unchecked menu items
- Nested menus
- Icons for menu items
- Rewrite ObjC code in C using ObjC Runtime (now ObjC code breaks many linters and static analyzers)
- Call GTK code using dlopen/dlsym (to make binaries run safely if Gtk libraries are not available)
This software is distributed under MIT license, so feel free to integrate it in your commercial products.
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