From efce9cc6dbbeece12fe348ec742f9c501459d37d Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Sun, 31 Aug 2025 22:25:12 +0800
Subject: Init XcbUiApplication.

---
 include/cru/platform/gui/xcb/UiApplication.h |  1 +
 src/platform/gui/xcb/UiApplication.cpp       | 13 ++++++++-----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/include/cru/platform/gui/xcb/UiApplication.h b/include/cru/platform/gui/xcb/UiApplication.h
index a58a538f..d8702087 100644
--- a/include/cru/platform/gui/xcb/UiApplication.h
+++ b/include/cru/platform/gui/xcb/UiApplication.h
@@ -60,5 +60,6 @@ class XcbUiApplication : public XcbResource, public virtual IUiApplication {
 
  private:
   xcb_connection_t* xcb_;
+  xcb_screen_t* screen_;
 };
 }  // namespace cru::platform::gui::xcb
diff --git a/src/platform/gui/xcb/UiApplication.cpp b/src/platform/gui/xcb/UiApplication.cpp
index baa36abe..6cd0a177 100644
--- a/src/platform/gui/xcb/UiApplication.cpp
+++ b/src/platform/gui/xcb/UiApplication.cpp
@@ -1,4 +1,5 @@
 #include <cru/platform/gui/xcb/UiApplication.h>
+
 #include <xcb/xcb.h>
 
 namespace cru::platform::gui::xcb {
@@ -6,15 +7,17 @@ XcbUiApplication::XcbUiApplication() {
   int screen_num;
   xcb_connection_t *connection = xcb_connect(NULL, &screen_num);
   this->CheckXcbConnectionError();
+
   const xcb_setup_t *setup = xcb_get_setup(connection);
   xcb_screen_iterator_t iter = xcb_setup_roots_iterator(setup);
-  xcb_screen_t *screen = iter.data;
+  this->screen_ = iter.data;
 }
 
 XcbUiApplication::~XcbUiApplication() { xcb_disconnect(this->xcb_); }
 
-void XcbUiApplication::CheckXcbConnectionError() { 
-if (xcb_connection_has_error(this->xcb_)) {
-  throw XcbException();
-}}
+void XcbUiApplication::CheckXcbConnectionError() {
+  if (xcb_connection_has_error(this->xcb_)) {
+    throw XcbException("xcb_connection_has_error returned non-zero.");
+  }
+}
 }  // namespace cru::platform::gui::xcb
-- 
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