From 7c135df9b8057e1de3ea6a73fb785d5622b519d4 Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Thu, 11 Sep 2025 23:25:49 +0800
Subject: xcb window title.

---
 include/cru/platform/gui/xcb/UiApplication.h |  1 +
 include/cru/platform/gui/xcb/Window.h        |  6 ++++--
 src/platform/gui/xcb/UiApplication.cpp       |  4 ++++
 src/platform/gui/xcb/Window.cpp              | 18 ++++++++++++++++++
 4 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/include/cru/platform/gui/xcb/UiApplication.h b/include/cru/platform/gui/xcb/UiApplication.h
index 87fd1063..cc38b3ed 100644
--- a/include/cru/platform/gui/xcb/UiApplication.h
+++ b/include/cru/platform/gui/xcb/UiApplication.h
@@ -31,6 +31,7 @@ class XcbUiApplication : public XcbResource, public virtual IUiApplication {
   xcb_screen_t* GetFirstXcbScreen();
 
   xcb_atom_t GetOrCreateXcbAtom(std::string name);
+  xcb_atom_t GetXcbAtom_NET_WM_NAME();
   xcb_atom_t GetXcbAtom_NET_WM_WINDOW_TYPE();
   xcb_atom_t GetXcbAtom_NET_WM_WINDOW_TYPE_NORMAL();
   xcb_atom_t GetXcbAtom_NET_WM_WINDOW_TYPE_UTILITY();
diff --git a/include/cru/platform/gui/xcb/Window.h b/include/cru/platform/gui/xcb/Window.h
index 43cd3b53..f118ed66 100644
--- a/include/cru/platform/gui/xcb/Window.h
+++ b/include/cru/platform/gui/xcb/Window.h
@@ -26,8 +26,8 @@ class XcbWindow : public XcbResource, public virtual INativeWindow {
   WindowStyleFlag GetStyleFlag() override;
   void SetStyleFlag(WindowStyleFlag flag) override;
 
-  virtual String GetTitle() = 0;
-  virtual void SetTitle(String title) = 0;
+  String GetTitle() override;
+  void SetTitle(String title) override;
 
   virtual WindowVisibilityType GetVisibility() = 0;
   virtual void SetVisibility(WindowVisibilityType visibility) = 0;
@@ -90,6 +90,7 @@ class XcbWindow : public XcbResource, public virtual INativeWindow {
 
   void DoSetParent(xcb_window_t window);
   void DoSetStyleFlags(xcb_window_t window);
+  void DoSetTitle(xcb_window_t window);
 
  private:
   XcbUiApplication* application_;
@@ -97,6 +98,7 @@ class XcbWindow : public XcbResource, public virtual INativeWindow {
   cairo_surface_t* cairo_surface_;
   Size current_size_;
   WindowStyleFlag style_;
+  std::string title_;
 
   XcbWindow* parent_;
 
diff --git a/src/platform/gui/xcb/UiApplication.cpp b/src/platform/gui/xcb/UiApplication.cpp
index 2fceac30..e5cab19f 100644
--- a/src/platform/gui/xcb/UiApplication.cpp
+++ b/src/platform/gui/xcb/UiApplication.cpp
@@ -63,6 +63,10 @@ xcb_atom_t XcbUiApplication::GetOrCreateXcbAtom(std::string name) {
   return atom;
 }
 
+xcb_atom_t XcbUiApplication::GetXcbAtom_NET_WM_NAME() {
+  return GetOrCreateXcbAtom("_NET_WM_NAME");
+}
+
 xcb_atom_t XcbUiApplication::GetXcbAtom_NET_WM_WINDOW_TYPE() {
   return GetOrCreateXcbAtom("_NET_WM_WINDOW_TYPE");
 }
diff --git a/src/platform/gui/xcb/Window.cpp b/src/platform/gui/xcb/Window.cpp
index 9b72789b..b56b8fa9 100644
--- a/src/platform/gui/xcb/Window.cpp
+++ b/src/platform/gui/xcb/Window.cpp
@@ -89,6 +89,15 @@ void XcbWindow::SetStyleFlag(WindowStyleFlag flag) {
   }
 }
 
+String XcbWindow::GetTitle() { return String::FromUtf8(title_); }
+
+void XcbWindow::SetTitle(String title) {
+  title_ = title.ToUtf8();
+  if (xcb_window_) {
+    DoSetTitle(*xcb_window_);
+  }
+}
+
 std::unique_ptr<graphics::IPainter> XcbWindow::BeginPaint() {
   assert(cairo_surface_);
 
@@ -392,4 +401,13 @@ void XcbWindow::DoSetStyleFlags(xcb_window_t window) {
                       XCB_ATOM_ATOM, 32, atoms.size(), atoms.data());
 }
 
+void XcbWindow::DoSetTitle(xcb_window_t window) {
+  for (auto atom : {static_cast<xcb_atom_t>(XCB_ATOM_WM_NAME),
+                    application_->GetXcbAtom_NET_WM_NAME()}) {
+    xcb_change_property(application_->GetXcbConnection(), XCB_PROP_MODE_REPLACE,
+                        window, atom, XCB_ATOM_STRING, 8, title_.size(),
+                        title_.data());
+  }
+}
+
 }  // namespace cru::platform::gui::xcb
-- 
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