From 1b197ca9997eb407407e508eb199b1e6fae78926 Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Tue, 2 Sep 2025 17:35:47 +0800
Subject: Override Run and AddOnQuitHandler.

---
 include/cru/platform/gui/xcb/UiApplication.h |  8 ++++++--
 src/platform/gui/xcb/UiApplication.cpp       | 17 ++++++++++++++++-
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/include/cru/platform/gui/xcb/UiApplication.h b/include/cru/platform/gui/xcb/UiApplication.h
index d8702087..9b3545c2 100644
--- a/include/cru/platform/gui/xcb/UiApplication.h
+++ b/include/cru/platform/gui/xcb/UiApplication.h
@@ -3,6 +3,7 @@
 #include "Base.h"
 
 #include <xcb/xcb.h>
+#include <functional>
 
 namespace cru::platform::gui::xcb {
 class XcbUiApplication : public XcbResource, public virtual IUiApplication {
@@ -12,12 +13,12 @@ class XcbUiApplication : public XcbResource, public virtual IUiApplication {
 
   void CheckXcbConnectionError();
 
-  virtual int Run() = 0;
+  int Run() override;
 
   // Post a quit message with given quit code.
   virtual void RequestQuit(int quit_code) = 0;
 
-  virtual void AddOnQuitHandler(std::function<void()> handler) = 0;
+  void AddOnQuitHandler(std::function<void()> handler) override;
 
   virtual bool IsQuitOnAllWindowClosed() = 0;
   virtual void SetQuitOnAllWindowClosed(bool quit_on_all_window_closed) = 0;
@@ -61,5 +62,8 @@ class XcbUiApplication : public XcbResource, public virtual IUiApplication {
  private:
   xcb_connection_t* xcb_;
   xcb_screen_t* screen_;
+
+  std::vector<std::function<void()>> quit_handlers_;
+  int exit_code_;
 };
 }  // namespace cru::platform::gui::xcb
diff --git a/src/platform/gui/xcb/UiApplication.cpp b/src/platform/gui/xcb/UiApplication.cpp
index 6cd0a177..fefc1335 100644
--- a/src/platform/gui/xcb/UiApplication.cpp
+++ b/src/platform/gui/xcb/UiApplication.cpp
@@ -3,7 +3,7 @@
 #include <xcb/xcb.h>
 
 namespace cru::platform::gui::xcb {
-XcbUiApplication::XcbUiApplication() {
+XcbUiApplication::XcbUiApplication() : exit_code_(0) {
   int screen_num;
   xcb_connection_t *connection = xcb_connect(NULL, &screen_num);
   this->CheckXcbConnectionError();
@@ -20,4 +20,19 @@ void XcbUiApplication::CheckXcbConnectionError() {
     throw XcbException("xcb_connection_has_error returned non-zero.");
   }
 }
+
+int XcbUiApplication::Run() {
+
+  // TODO: A Big Implement.
+
+  for (const auto &handler : this->quit_handlers_) {
+    handler();
+  }
+
+  return exit_code_;
+}
+
+void XcbUiApplication::AddOnQuitHandler(std::function<void()> handler) {
+  this->quit_handlers_.push_back(std::move(handler));
+}
 }  // namespace cru::platform::gui::xcb
-- 
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