From 57763bb30b86737810bdd8458ba62b378481b994 Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Thu, 25 Sep 2025 01:27:40 +0800
Subject: Impl xcb window set cursor.

---
 src/platform/gui/xcb/Window.cpp | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

(limited to 'src/platform/gui/xcb/Window.cpp')

diff --git a/src/platform/gui/xcb/Window.cpp b/src/platform/gui/xcb/Window.cpp
index 863738f1..4de7a6d3 100644
--- a/src/platform/gui/xcb/Window.cpp
+++ b/src/platform/gui/xcb/Window.cpp
@@ -3,11 +3,13 @@
 #include "cru/base/Guard.h"
 #include "cru/platform/Check.h"
 #include "cru/platform/GraphicsBase.h"
+#include "cru/platform/graphics/NullPainter.h"
 #include "cru/platform/graphics/Painter.h"
 #include "cru/platform/graphics/cairo/CairoPainter.h"
 #include "cru/platform/gui/Base.h"
 #include "cru/platform/gui/Keyboard.h"
 #include "cru/platform/gui/Window.h"
+#include "cru/platform/gui/xcb/Cursor.h"
 #include "cru/platform/gui/xcb/Keyboard.h"
 #include "cru/platform/gui/xcb/UiApplication.h"
 
@@ -274,7 +276,12 @@ bool XcbWindow::ReleaseMouse() {
   return true;
 }
 
-void XcbWindow::SetCursor(std::shared_ptr<ICursor> cursor) { NotImplemented(); }
+void XcbWindow::SetCursor(std::shared_ptr<ICursor> cursor) {
+  if (!xcb_window_) return;
+  auto xcb_cursor = CheckPlatform<XcbCursor>(cursor, GetPlatformId());
+  cursor_ = xcb_cursor;
+  DoSetCursor(*xcb_window_, xcb_cursor.get());
+}
 
 void XcbWindow::SetToForeground() {
   SetVisibility(WindowVisibilityType::Show);
@@ -291,7 +298,9 @@ void XcbWindow::RequestRepaint() {
 }
 
 std::unique_ptr<graphics::IPainter> XcbWindow::BeginPaint() {
-  assert(cairo_surface_);
+  if (!xcb_window_.has_value()) {
+    return std::make_unique<graphics::NullPainter>();
+  }
 
   auto factory = application_->GetCairoFactory();
   cairo_t *cairo = cairo_create(cairo_surface_);
@@ -377,6 +386,7 @@ xcb_window_t XcbWindow::DoCreateWindow() {
 
   DoSetStyleFlags(window);
   DoSetParent(window);
+  DoSetCursor(window, cursor_.get());
 
   xcb_visualtype_t *visual_type;
 
@@ -654,6 +664,13 @@ void XcbWindow::DoSetClientRect(xcb_window_t window, const Rect &rect) {
                        values);
 }
 
+void XcbWindow::DoSetCursor(xcb_window_t window, XcbCursor *cursor) {
+  std::uint32_t values[]{cursor ? cursor->GetXcbCursor() : XCB_CURSOR_NONE};
+  xcb_change_window_attributes(application_->GetXcbConnection(), window,
+                               XCB_CW_CURSOR, values);
+  application_->XcbFlush();
+}
+
 void *XcbWindow::XcbGetProperty(xcb_window_t window, xcb_atom_t property,
                                 xcb_atom_t type, std::uint32_t offset,
                                 std::uint32_t length,
-- 
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