system tray support

src/sys_tray.cpp

@@ -0,0 +1,100 @@
+#include "./sys_tray.hpp"
+
+#include "./icon_generator.hpp"
+
+#include <memory>
+#include <iostream>
+#include <stdexcept>
+
+SystemTray::SystemTray(SDL_Window* main_window) : _main_window(main_window) {
+	std::cout << "ST: adding system tray\n";
+
+	_tray = SDL_CreateTray(nullptr, "tomato");
+	if (_tray == nullptr) {
+		//std::cerr << "ST: failed to create SystemTray: " << SDL_GetError() << "\n";
+		throw std::runtime_error(std::string{"ST: failed to create SystemTray: "} + SDL_GetError());
+		return;
+	}
+
+	auto* tray_menu = SDL_CreateTrayMenu(_tray);
+	{
+		auto* entry_quit = SDL_InsertTrayEntryAt(tray_menu, 0, "Quit Tomato", SDL_TRAYENTRY_BUTTON);
+		SDL_SetTrayEntryCallback(entry_quit,
+			+[](void*, SDL_TrayEntry*){
+				// this is thread safe and triggers the shutdown in the main thread
+				SDL_Event quit_event;
+				quit_event.quit = {
+					SDL_EVENT_QUIT,
+					0,
+					SDL_GetTicksNS(),
+				};
+				SDL_PushEvent(&quit_event);
+			}
+		, nullptr);
+	}
+	{
+		_entry_showhide = SDL_InsertTrayEntryAt(tray_menu, 0, "Hide Tomato", SDL_TRAYENTRY_BUTTON);
+		SDL_SetTrayEntryCallback(_entry_showhide,
+			+[](void* userdata, SDL_TrayEntry*){
+				SDL_HideWindow(static_cast<SystemTray*>(userdata)->_main_window);
+			}
+		, this);
+	}
+}
+
+SystemTray::~SystemTray(void) {
+	if (_tray != nullptr) {
+		SDL_DestroyTray(_tray);
+		_tray = nullptr;
+	}
+}
+
+void SystemTray::setIcon(SDL_Surface* surf) {
+	if (_tray == nullptr) {
+		return;
+	}
+
+	SDL_SetTrayIcon(_tray, surf);
+}
+
+void SystemTray::setStatusText(const std::string& status) {
+	if (_tray == nullptr) {
+		return;
+	}
+
+	if (_entry_status == nullptr) {
+		_entry_status = SDL_InsertTrayEntryAt(SDL_GetTrayMenu(_tray), 0, status.c_str(), SDL_TRAYENTRY_DISABLED);
+		return;
+	}
+
+	SDL_SetTrayEntryLabel(_entry_status, status.c_str());
+}
+
+void SystemTray::update(void) {
+	if (_tray == nullptr) {
+		return;
+	}
+
+	if (_entry_showhide != nullptr) {
+		// check if window is open and adjust text and callback
+		const bool hidden {(SDL_GetWindowFlags(_main_window) & SDL_WINDOW_HIDDEN) > 0};
+		// TODO: cache state
+
+		if (hidden) {
+			SDL_SetTrayEntryLabel(_entry_showhide, "Show Tomato");
+			SDL_SetTrayEntryCallback(_entry_showhide,
+				+[](void* userdata, SDL_TrayEntry*){
+					SDL_ShowWindow(static_cast<SystemTray*>(userdata)->_main_window);
+				}
+			, this);
+		} else {
+			SDL_SetTrayEntryLabel(_entry_showhide, "Hide Tomato");
+			SDL_SetTrayEntryCallback(_entry_showhide,
+				+[](void* userdata, SDL_TrayEntry*){
+					SDL_HideWindow(static_cast<SystemTray*>(userdata)->_main_window);
+				}
+			, this);
+		}
+	}
+}
+