From aa4b59d594a962f34a7737a015703f0878c73b35 Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Wed, 10 Sep 2025 00:28:49 +0800
Subject: xcb window resize event.

---
 include/cru/platform/gui/xcb/Window.h |  4 +++-
 src/platform/gui/xcb/Window.cpp       | 19 +++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/include/cru/platform/gui/xcb/Window.h b/include/cru/platform/gui/xcb/Window.h
index 475f2527..4c9e3f4d 100644
--- a/include/cru/platform/gui/xcb/Window.h
+++ b/include/cru/platform/gui/xcb/Window.h
@@ -67,7 +67,7 @@ class XcbWindow : public XcbResource, public virtual INativeWindow {
   virtual IEvent<std::nullptr_t>* PaintEvent() = 0;
 
   virtual IEvent<WindowVisibilityType>* VisibilityChangeEvent() = 0;
-  virtual IEvent<Size>* ResizeEvent() = 0;
+  IEvent<Size>* ResizeEvent() override;
   IEvent<FocusChangeType>* FocusEvent() override;
 
   IEvent<MouseEnterLeaveType>* MouseEnterLeaveEvent() override;
@@ -91,10 +91,12 @@ class XcbWindow : public XcbResource, public virtual INativeWindow {
  private:
   XcbUiApplication* application_;
   std::optional<xcb_window_t> xcb_window_;
+  Size current_size_;
 
   Event<std::nullptr_t> create_event_;
   Event<std::nullptr_t> destroy_event_;
 
+  Event<Size> resize_event_;
   Event<FocusChangeType> focus_event_;
   Event<MouseEnterLeaveType> mouse_enter_leave_event_;
   Event<Point> mouse_move_event_;
diff --git a/src/platform/gui/xcb/Window.cpp b/src/platform/gui/xcb/Window.cpp
index 179e13af..67568dce 100644
--- a/src/platform/gui/xcb/Window.cpp
+++ b/src/platform/gui/xcb/Window.cpp
@@ -59,6 +59,8 @@ IEvent<std::nullptr_t> *XcbWindow::CreateEvent() { return &create_event_; }
 
 IEvent<std::nullptr_t> *XcbWindow::DestroyEvent() { return &destroy_event_; }
 
+IEvent<Size> *XcbWindow::ResizeEvent() { return &resize_event_; }
+
 IEvent<FocusChangeType> *XcbWindow::FocusEvent() { return &focus_event_; }
 
 IEvent<MouseEnterLeaveType> *XcbWindow::MouseEnterLeaveEvent() {
@@ -104,6 +106,7 @@ xcb_window_t XcbWindow::DoCreateWindow() {
   xcb_create_window(connection, XCB_COPY_FROM_PARENT, xcb_window, screen->root,
                     100, 100, 400, 200, 10, XCB_WINDOW_CLASS_INPUT_OUTPUT,
                     screen->root_visual, mask, values);
+  current_size_ = {400, 200};
 
   create_event_.Raise(nullptr);
 
@@ -125,6 +128,17 @@ void XcbWindow::HandleEvent(xcb_generic_event_t *event) {
     case XCB_DESTROY_NOTIFY: {
       destroy_event_.Raise(nullptr);
       xcb_window_ = std::nullopt;
+      break;
+    }
+    case XCB_CONFIGURE_NOTIFY: {
+      xcb_configure_notify_event_t *configure =
+          (xcb_configure_notify_event_t *)event;
+      if (configure->width != current_size_.width ||
+          configure->height != current_size_.height) {
+        current_size_ = Size(configure->width, configure->height);
+        resize_event_.Raise(current_size_);
+      }
+      break;
     }
     case XCB_FOCUS_IN: {
       focus_event_.Raise(FocusChangeType::Gain);
@@ -217,6 +231,11 @@ std::optional<xcb_window_t> XcbWindow::GetEventWindow(
       xcb_destroy_notify_event_t *destroy = (xcb_destroy_notify_event_t *)event;
       return destroy->event;
     }
+    case XCB_CONFIGURE_NOTIFY: {
+      xcb_configure_notify_event_t *configure =
+          (xcb_configure_notify_event_t *)event;
+      return configure->event;
+    }
     case XCB_FOCUS_IN: {
       xcb_focus_in_event_t *fi = (xcb_focus_in_event_t *)event;
       return fi->event;
-- 
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