From 5fde4557b2e8f9052634055d95932b95d1eb9c41 Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Tue, 9 Sep 2025 01:51:01 +0800
Subject: Implement timers on XcbUiApplication.

---
 include/cru/platform/gui/xcb/UiApplication.h | 21 +++++++++------------
 src/platform/gui/xcb/UiApplication.cpp       | 18 ++++++++++++++++++
 2 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/include/cru/platform/gui/xcb/UiApplication.h b/include/cru/platform/gui/xcb/UiApplication.h
index 9b3545c2..af1c40f4 100644
--- a/include/cru/platform/gui/xcb/UiApplication.h
+++ b/include/cru/platform/gui/xcb/UiApplication.h
@@ -2,6 +2,8 @@
 #include "../UiApplication.h"
 #include "Base.h"
 
+#include <cru/base/platform/unix/EventLoop.h>
+
 #include <xcb/xcb.h>
 #include <functional>
 
@@ -15,7 +17,6 @@ class XcbUiApplication : public XcbResource, public virtual IUiApplication {
 
   int Run() override;
 
-  // Post a quit message with given quit code.
   virtual void RequestQuit(int quit_code) = 0;
 
   void AddOnQuitHandler(std::function<void()> handler) override;
@@ -23,17 +24,12 @@ class XcbUiApplication : public XcbResource, public virtual IUiApplication {
   virtual bool IsQuitOnAllWindowClosed() = 0;
   virtual void SetQuitOnAllWindowClosed(bool quit_on_all_window_closed) = 0;
 
-  // Timer id should always be positive (not 0) and never the same. So it's ok
-  // to use negative value (or 0) to represent no timer.
-  virtual long long SetImmediate(std::function<void()> action) = 0;
-  virtual long long SetTimeout(std::chrono::milliseconds milliseconds,
-                               std::function<void()> action) = 0;
-  virtual long long SetInterval(std::chrono::milliseconds milliseconds,
-                                std::function<void()> action) = 0;
-  // Implementation should guarantee calls on timer id already canceled have no
-  // effects and do not crash. Also canceling negative id or 0 should always
-  // result in no-op.
-  virtual void CancelTimer(long long id) = 0;
+  long long SetImmediate(std::function<void()> action) override;
+  long long SetTimeout(std::chrono::milliseconds milliseconds,
+                       std::function<void()> action) override;
+  long long SetInterval(std::chrono::milliseconds milliseconds,
+                        std::function<void()> action) override;
+  void CancelTimer(long long id) override;
 
   virtual std::vector<INativeWindow*> GetAllWindow() = 0;
 
@@ -63,6 +59,7 @@ class XcbUiApplication : public XcbResource, public virtual IUiApplication {
   xcb_connection_t* xcb_;
   xcb_screen_t* screen_;
 
+  cru::platform::unix::UnixEventLoop event_loop_;
   std::vector<std::function<void()>> quit_handlers_;
   int exit_code_;
 };
diff --git a/src/platform/gui/xcb/UiApplication.cpp b/src/platform/gui/xcb/UiApplication.cpp
index fefc1335..17111e0c 100644
--- a/src/platform/gui/xcb/UiApplication.cpp
+++ b/src/platform/gui/xcb/UiApplication.cpp
@@ -35,4 +35,22 @@ int XcbUiApplication::Run() {
 void XcbUiApplication::AddOnQuitHandler(std::function<void()> handler) {
   this->quit_handlers_.push_back(std::move(handler));
 }
+
+long long XcbUiApplication::SetImmediate(std::function<void()> action) {
+  return event_loop_.SetImmediate(std::move(action));
+}
+
+long long XcbUiApplication::SetTimeout(std::chrono::milliseconds milliseconds,
+                                       std::function<void()> action) {
+  return event_loop_.SetTimeout(std::move(action), std::move(milliseconds));
+}
+
+long long XcbUiApplication::SetInterval(std::chrono::milliseconds milliseconds,
+                                        std::function<void()> action) {
+  return event_loop_.SetInterval(std::move(action), std::move(milliseconds));
+}
+
+void XcbUiApplication::CancelTimer(long long id) {
+  return event_loop_.CancelTimer(static_cast<int>(id));
+}
 }  // namespace cru::platform::gui::xcb
-- 
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