mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-04-25 05:55:13 +00:00
4b15dd2bca
These functions don't exit immediately, but rather on the next iteration of the event loop. Since exit() is already used by the standard library, let's call it quit() instead. That way, saying exit() means the same thing here as anywhere else.
417 lines
13 KiB
C++
417 lines
13 KiB
C++
#include "GEventLoop.h"
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#include "GEvent.h"
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#include "GObject.h"
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#include "GWindow.h"
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#include <LibGUI/GAction.h>
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#include <LibGUI/GNotifier.h>
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#include <LibGUI/GMenu.h>
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#include <LibC/unistd.h>
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#include <LibC/stdio.h>
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#include <LibC/fcntl.h>
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#include <LibC/string.h>
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#include <LibC/time.h>
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#include <LibC/sys/select.h>
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#include <LibC/sys/socket.h>
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#include <LibC/errno.h>
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#include <LibC/string.h>
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#include <LibC/stdlib.h>
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//#define GEVENTLOOP_DEBUG
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static GEventLoop* s_mainGEventLoop;
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void GEventLoop::initialize()
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{
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s_mainGEventLoop = nullptr;
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}
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GEventLoop::GEventLoop()
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{
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if (!s_mainGEventLoop)
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s_mainGEventLoop = this;
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m_event_fd = socket(AF_LOCAL, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
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if (m_event_fd < 0) {
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perror("socket");
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ASSERT_NOT_REACHED();
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}
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sockaddr_un address;
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address.sun_family = AF_LOCAL;
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strcpy(address.sun_path, "/wsportal");
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int retries = 1000;
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int rc = 0;
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while (retries) {
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rc = connect(m_event_fd, (const sockaddr*)&address, sizeof(address));
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if (rc == 0)
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break;
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dbgprintf("connect failed: %d, %s\n", errno, strerror(errno));
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sleep(1);
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--retries;
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}
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if (rc < 0) {
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ASSERT_NOT_REACHED();
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}
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dbgprintf("(%u) GEventLoop constructed :)\n", getpid());
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}
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GEventLoop::~GEventLoop()
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{
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}
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GEventLoop& GEventLoop::main()
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{
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ASSERT(s_mainGEventLoop);
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return *s_mainGEventLoop;
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}
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void GEventLoop::quit(int code)
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{
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m_exit_requested = true;
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m_exit_code = code;
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}
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int GEventLoop::exec()
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{
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m_running = true;
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for (;;) {
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if (m_exit_requested)
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return m_exit_code;
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if (m_queued_events.is_empty())
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wait_for_event();
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Vector<QueuedEvent> events = move(m_queued_events);
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for (auto& queued_event : events) {
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auto* receiver = queued_event.receiver;
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auto& event = *queued_event.event;
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#ifdef GEVENTLOOP_DEBUG
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dbgprintf("GEventLoop: %s{%p} event %u\n", receiver->class_name(), receiver, (unsigned)event.type());
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#endif
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if (!receiver) {
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switch (event.type()) {
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case GEvent::Quit:
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ASSERT_NOT_REACHED();
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return 0;
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default:
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dbgprintf("event type %u with no receiver :(\n", event.type());
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ASSERT_NOT_REACHED();
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return 1;
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}
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} else {
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receiver->event(event);
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}
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}
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}
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ASSERT_NOT_REACHED();
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}
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void GEventLoop::post_event(GObject* receiver, OwnPtr<GEvent>&& event)
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{
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#ifdef GEVENTLOOP_DEBUG
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dbgprintf("GEventLoop::post_event: {%u} << receiver=%p, event=%p\n", m_queued_events.size(), receiver, event.ptr());
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#endif
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m_queued_events.append({ receiver, move(event) });
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}
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void GEventLoop::handle_paint_event(const WSAPI_ServerMessage& event, GWindow& window)
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{
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#ifdef GEVENTLOOP_DEBUG
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dbgprintf("WID=%x Paint [%d,%d %dx%d]\n", event.window_id, event.paint.rect.location.x, event.paint.rect.location.y, event.paint.rect.size.width, event.paint.rect.size.height);
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#endif
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post_event(&window, make<GPaintEvent>(event.paint.rect));
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}
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void GEventLoop::handle_window_activation_event(const WSAPI_ServerMessage& event, GWindow& window)
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{
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#ifdef GEVENTLOOP_DEBUG
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dbgprintf("WID=%x WindowActivation\n", event.window_id);
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#endif
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post_event(&window, make<GEvent>(event.type == WSAPI_ServerMessage::Type::WindowActivated ? GEvent::WindowBecameActive : GEvent::WindowBecameInactive));
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}
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void GEventLoop::handle_window_close_request_event(const WSAPI_ServerMessage&, GWindow& window)
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{
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post_event(&window, make<GEvent>(GEvent::WindowCloseRequest));
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}
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void GEventLoop::handle_key_event(const WSAPI_ServerMessage& event, GWindow& window)
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{
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#ifdef GEVENTLOOP_DEBUG
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dbgprintf("WID=%x KeyEvent character=0x%b\n", event.window_id, event.key.character);
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#endif
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auto key_event = make<GKeyEvent>(event.type == WSAPI_ServerMessage::Type::KeyDown ? GEvent::KeyDown : GEvent::KeyUp, event.key.key);
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key_event->m_alt = event.key.alt;
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key_event->m_ctrl = event.key.ctrl;
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key_event->m_shift = event.key.shift;
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if (event.key.character != '\0')
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key_event->m_text = String(&event.key.character, 1);
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post_event(&window, move(key_event));
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}
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void GEventLoop::handle_mouse_event(const WSAPI_ServerMessage& event, GWindow& window)
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{
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#ifdef GEVENTLOOP_DEBUG
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dbgprintf("WID=%x MouseEvent %d,%d\n", event.window_id, event.mouse.position.x, event.mouse.position.y);
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#endif
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GMouseEvent::Type type;
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switch (event.type) {
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case WSAPI_ServerMessage::Type::MouseMove: type = GEvent::MouseMove; break;
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case WSAPI_ServerMessage::Type::MouseUp: type = GEvent::MouseUp; break;
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case WSAPI_ServerMessage::Type::MouseDown: type = GEvent::MouseDown; break;
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default: ASSERT_NOT_REACHED(); break;
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}
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GMouseButton button { GMouseButton::None };
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switch (event.mouse.button) {
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case WSAPI_MouseButton::NoButton: button = GMouseButton::None; break;
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case WSAPI_MouseButton::Left: button = GMouseButton::Left; break;
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case WSAPI_MouseButton::Right: button = GMouseButton::Right; break;
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case WSAPI_MouseButton::Middle: button = GMouseButton::Middle; break;
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default: ASSERT_NOT_REACHED(); break;
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}
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post_event(&window, make<GMouseEvent>(type, event.mouse.position, event.mouse.buttons, button));
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}
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void GEventLoop::handle_menu_event(const WSAPI_ServerMessage& event)
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{
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if (event.type == WSAPI_ServerMessage::Type::MenuItemActivated) {
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auto* menu = GMenu::from_menu_id(event.menu.menu_id);
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if (!menu) {
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dbgprintf("GEventLoop received event for invalid window ID %d\n", event.window_id);
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return;
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}
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if (auto* action = menu->action_at(event.menu.identifier))
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action->activate();
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return;
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}
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ASSERT_NOT_REACHED();
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}
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void GEventLoop::wait_for_event()
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{
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fd_set rfds;
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fd_set wfds;
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FD_ZERO(&rfds);
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FD_ZERO(&wfds);
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int max_fd = 0;
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auto add_fd_to_set = [&max_fd] (int fd, fd_set& set){
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FD_SET(fd, &set);
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if (fd > max_fd)
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max_fd = fd;
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};
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add_fd_to_set(m_event_fd, rfds);
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for (auto& notifier : m_notifiers) {
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if (notifier->event_mask() & GNotifier::Read)
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add_fd_to_set(notifier->fd(), rfds);
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if (notifier->event_mask() & GNotifier::Write)
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add_fd_to_set(notifier->fd(), wfds);
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if (notifier->event_mask() & GNotifier::Exceptional)
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ASSERT_NOT_REACHED();
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}
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struct timeval timeout = { 0, 0 };
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if (!m_timers.is_empty())
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get_next_timer_expiration(timeout);
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int rc = select(max_fd + 1, &rfds, &wfds, nullptr, (m_queued_events.is_empty() && m_timers.is_empty()) ? nullptr : &timeout);
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if (rc < 0) {
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ASSERT_NOT_REACHED();
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}
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for (auto& it : m_timers) {
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auto& timer = *it.value;
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if (!timer.has_expired())
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continue;
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#ifdef GEVENTLOOP_DEBUG
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dbgprintf("GEventLoop: Timer %d has expired, sending GTimerEvent to %p\n", timer.timer_id, timer.owner);
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#endif
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post_event(timer.owner, make<GTimerEvent>(timer.timer_id));
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if (timer.should_reload) {
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timer.reload();
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} else {
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// FIXME: Support removing expired timers that don't want to reload.
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ASSERT_NOT_REACHED();
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}
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}
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for (auto& notifier : m_notifiers) {
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if (FD_ISSET(notifier->fd(), &rfds)) {
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if (notifier->on_ready_to_read)
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notifier->on_ready_to_read(*notifier);
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}
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if (FD_ISSET(notifier->fd(), &wfds)) {
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if (notifier->on_ready_to_write)
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notifier->on_ready_to_write(*notifier);
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}
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}
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if (!FD_ISSET(m_event_fd, &rfds))
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return;
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bool success = drain_messages_from_server();
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ASSERT(success);
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auto unprocessed_events = move(m_unprocessed_messages);
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for (auto& event : unprocessed_events) {
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if (event.type == WSAPI_ServerMessage::Error) {
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dbgprintf("GEventLoop got error message from server\n");
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dbgprintf(" - error message: %s\n", String(event.text, event.text_length).characters());
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quit(1);
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return;
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}
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switch (event.type) {
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case WSAPI_ServerMessage::MenuItemActivated:
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handle_menu_event(event);
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continue;
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default:
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break;
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}
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auto* window = GWindow::from_window_id(event.window_id);
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if (!window) {
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dbgprintf("GEventLoop received event for invalid window ID %d\n", event.window_id);
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continue;
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}
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switch (event.type) {
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case WSAPI_ServerMessage::Type::Paint:
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handle_paint_event(event, *window);
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break;
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case WSAPI_ServerMessage::Type::MouseDown:
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case WSAPI_ServerMessage::Type::MouseUp:
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case WSAPI_ServerMessage::Type::MouseMove:
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handle_mouse_event(event, *window);
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break;
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case WSAPI_ServerMessage::Type::WindowActivated:
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case WSAPI_ServerMessage::Type::WindowDeactivated:
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handle_window_activation_event(event, *window);
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break;
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case WSAPI_ServerMessage::Type::WindowCloseRequest:
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handle_window_close_request_event(event, *window);
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break;
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case WSAPI_ServerMessage::Type::KeyDown:
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case WSAPI_ServerMessage::Type::KeyUp:
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handle_key_event(event, *window);
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break;
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default:
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break;
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}
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}
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}
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bool GEventLoop::drain_messages_from_server()
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{
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for (;;) {
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WSAPI_ServerMessage message;
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ssize_t nread = read(m_event_fd, &message, sizeof(WSAPI_ServerMessage));
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if (nread < 0) {
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perror("read");
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quit(1);
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return false;
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}
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if (nread == 0)
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return true;
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assert(nread == sizeof(message));
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m_unprocessed_messages.append(move(message));
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}
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}
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bool GEventLoop::EventLoopTimer::has_expired() const
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{
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timeval now;
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gettimeofday(&now, nullptr);
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return now.tv_sec > fire_time.tv_sec || (now.tv_sec == fire_time.tv_sec && now.tv_usec >= fire_time.tv_usec);
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}
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void GEventLoop::EventLoopTimer::reload()
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{
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gettimeofday(&fire_time, nullptr);
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fire_time.tv_sec += interval / 1000;
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fire_time.tv_usec += interval % 1000;
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}
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void GEventLoop::get_next_timer_expiration(timeval& soonest)
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{
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ASSERT(!m_timers.is_empty());
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bool has_checked_any = false;
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for (auto& it : m_timers) {
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auto& fire_time = it.value->fire_time;
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if (!has_checked_any || fire_time.tv_sec < soonest.tv_sec || (fire_time.tv_sec == soonest.tv_sec && fire_time.tv_usec < soonest.tv_usec))
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soonest = fire_time;
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has_checked_any = true;
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}
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}
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int GEventLoop::register_timer(GObject& object, int milliseconds, bool should_reload)
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{
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ASSERT(milliseconds >= 0);
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auto timer = make<EventLoopTimer>();
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timer->owner = &object;
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timer->interval = milliseconds;
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timer->reload();
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timer->should_reload = should_reload;
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int timer_id = ++m_next_timer_id; // FIXME: This will eventually wrap around.
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ASSERT(timer_id); // FIXME: Aforementioned wraparound.
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timer->timer_id = timer_id;
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m_timers.set(timer->timer_id, move(timer));
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return timer_id;
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}
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bool GEventLoop::unregister_timer(int timer_id)
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{
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auto it = m_timers.find(timer_id);
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if (it == m_timers.end())
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return false;
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m_timers.remove(it);
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return true;
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}
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void GEventLoop::register_notifier(Badge<GNotifier>, GNotifier& notifier)
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{
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m_notifiers.set(¬ifier);
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}
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void GEventLoop::unregister_notifier(Badge<GNotifier>, GNotifier& notifier)
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{
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m_notifiers.remove(¬ifier);
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}
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bool GEventLoop::post_message_to_server(const WSAPI_ClientMessage& message)
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{
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int nwritten = write(m_event_fd, &message, sizeof(WSAPI_ClientMessage));
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return nwritten == sizeof(WSAPI_ClientMessage);
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}
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bool GEventLoop::wait_for_specific_event(WSAPI_ServerMessage::Type type, WSAPI_ServerMessage& event)
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{
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for (;;) {
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fd_set rfds;
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FD_ZERO(&rfds);
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FD_SET(m_event_fd, &rfds);
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int rc = select(m_event_fd + 1, &rfds, nullptr, nullptr, nullptr);
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ASSERT(rc > 0);
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ASSERT(FD_ISSET(m_event_fd, &rfds));
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bool success = drain_messages_from_server();
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if (!success)
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return false;
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for (size_t i = 0; i < m_unprocessed_messages.size(); ++i) {
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if (m_unprocessed_messages[i].type == type) {
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event = move(m_unprocessed_messages[i]);
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m_unprocessed_messages.remove(i);
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return true;
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}
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}
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}
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}
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WSAPI_ServerMessage GEventLoop::sync_request(const WSAPI_ClientMessage& request, WSAPI_ServerMessage::Type response_type)
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{
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bool success = post_message_to_server(request);
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ASSERT(success);
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WSAPI_ServerMessage response;
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success = GEventLoop::main().wait_for_specific_event(response_type, response);
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ASSERT(success);
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return response;
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}
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