Destroy client's windows on disconnect

This makes sure client's windows are removed from the root window and
all of the destroy events are sent.

xbanan/Base.cpp

@@ -374,6 +374,9 @@ void invalidate_window(WINDOW wid, int32_t x, int32_t y, int32_t w, int32_t h)
 
 	for (;;)
 	{
+		if (wid == g_root.windowId)
+			return;
+
 		auto& object = *g_objects[wid];
 		ASSERT(object.type == Object::Type::Window);
 
@@ -506,17 +509,26 @@ transitient_for_done:
 
 static BAN::ErrorOr<void> map_window(Client& client_info, WINDOW wid)
 {
+	static const CARD32 WM_CLASS = g_atoms_name_to_id["WM_CLASS"_sv];
+
 	auto& object = *g_objects[wid];
 	ASSERT(object.type == Object::Type::Window);
 
 	auto& window = object.object.get<Object::Window>();
 	if (window.mapped)
 		return {};
+	window.mapped = true;
 
 	if (window.parent == g_root.windowId)
 	{
 		ASSERT(!window.platform_window);
 
+		// NOTE: This is not perfect but seems to work.
+		//       This is used to not display "dummy" event windows
+		//       that should not be visible.
+		if (!window.properties.contains(WM_CLASS))
+			return {};
+
 		auto info = get_plaform_window_info(window);
 		window.platform_window = TRY(g_platform_ops.create_window(
 			info.transient_for,
@@ -529,8 +541,6 @@ static BAN::ErrorOr<void> map_window(Client& client_info, WINDOW wid)
 		));
 	}
 
-	window.mapped = true;
-
 	for (auto& pixel : window.pixels)
 		pixel = window.background;
 	invalidate_window(wid, 0, 0, window.width, window.height);
@@ -1932,12 +1942,15 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
 
 			const auto& window = TRY_REF(get_window(client_info, wid, opcode));
 
-			int32_t root_x, root_y;
-			int32_t event_x, event_y;
-			root_x = event_x = window.cursor_x;
-			root_y = event_y = window.cursor_y;
-
-			const auto child_wid = find_child_window(wid, event_x, event_y);
+			WINDOW child_wid { None };
+			for (auto wid_ : window.children)
+			{
+				const auto& child_window = g_objects[wid_]->object.get<Object::Window>();
+				if (!child_window.hovered)
+					continue;
+				child_wid = wid_;
+				break;
+			}
 
 			xQueryPointerReply reply {
 				.type = X_Reply,
@@ -1945,11 +1958,11 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
 				.sequenceNumber = client_info.sequence,
 				.length = 0,
 				.root = g_root.windowId,
-				.child = static_cast<CARD32>(child_wid == wid ? None : child_wid),
-				.rootX = static_cast<INT16>(root_x),
-				.rootY = static_cast<INT16>(root_y),
-				.winX = static_cast<INT16>(event_x),
-				.winY = static_cast<INT16>(event_y),
+				.child = static_cast<CARD32>(child_wid),
+				.rootX = static_cast<INT16>(window.cursor_x), // FIXME
+				.rootY = static_cast<INT16>(window.cursor_y), // FIXME
+				.winX = static_cast<INT16>(window.cursor_x),
+				.winY = static_cast<INT16>(window.cursor_y),
 				.mask = static_cast<KeyButMask>(g_keymask | g_butmask),
 			};
 			TRY(encode(client_info.output_buffer, reply));

xbanan/Events.cpp

@@ -453,7 +453,22 @@ static void send_enter_and_leave_events(WINDOW old_wid, int32_t old_x, int32_t o
 		g_objects[wid]->object.get<Object::Window>().hovered = false;
 	for (const auto wid : new_child_path)
 		g_objects[wid]->object.get<Object::Window>().hovered = true;
+}
 
+static WINDOW s_current_top_level_window = None;
+
+void on_window_leave_event(WINDOW wid)
+{
+	if (s_current_top_level_window != wid)
+		return;
+
+	auto& object = *g_objects[wid];
+	ASSERT(object.type == Object::Type::Window);
+	auto& window = object.object.get<Object::Window>();
+
+	send_enter_and_leave_events(wid, window.cursor_x, window.cursor_y, wid, -1, -1);
+
+	s_current_top_level_window = None;
 }
 
 void on_mouse_move_event(WINDOW wid, int32_t x, int32_t y)
@@ -464,24 +479,17 @@ void on_mouse_move_event(WINDOW wid, int32_t x, int32_t y)
 
 	update_cursor(wid, x, y);
 
+	if (auto it = g_objects.find(s_current_top_level_window); it == g_objects.end())
+		send_enter_and_leave_events(wid, -1, -1, wid, x, y);
+	else
 	{
-		static WINDOW old_wid = g_root.windowId;
-
-		auto it = g_objects.find(old_wid);
-		if (it == g_objects.end())
-		{
-			old_wid = g_root.windowId;
-			it = g_objects.find(g_root.windowId);
-		}
-
 		ASSERT(it->value->type == Object::Type::Window);
 		auto& old_window = it->value->object.get<Object::Window>();
-
-		send_enter_and_leave_events(old_wid, old_window.cursor_x, old_window.cursor_y, wid, x, y);
-
-		old_wid = wid;
+		send_enter_and_leave_events(s_current_top_level_window, old_window.cursor_x, old_window.cursor_y, wid, x, y);
 	}
 
+	s_current_top_level_window = wid;
+
 	update_cursor_position_recursive(wid, x, y);
 
 	// TODO: optimize with PointerMotionHint

xbanan/Events.h

@@ -9,6 +9,7 @@ void on_window_close_event(WINDOW wid);
 void on_window_resize_event(WINDOW wid, uint32_t width, uint32_t height);
 void on_window_focus_event(WINDOW wid, bool focused);
 void on_window_fullscreen_event(WINDOW wid, bool is_fullscreen);
+void on_window_leave_event(WINDOW wid);
 
 void on_mouse_move_event(WINDOW wid, int32_t x, int32_t y);
 void on_mouse_button_event(WINDOW wid, uint8_t xbutton, bool pressed);

xbanan/SDL2/sdl2.cpp

@@ -215,6 +215,9 @@ static void sdl2_poll_events(void*)
 					case SDL_WINDOWEVENT_RESTORED:
 						on_window_fullscreen_event(window.wid, false);
 						break;
+					case SDL_WINDOWEVENT_LEAVE:
+						on_window_leave_event(window.wid);
+						break;
 				}
 				break;
 			}

xbanan/main.cpp

@@ -290,6 +290,18 @@ int main()
 				window.event_masks.remove(&client_info);
 			}
 
+			for (auto it = client_info.objects.begin(); it != client_info.objects.end();)
+			{
+				auto obj_it = g_objects.find(*it);
+				if (obj_it == g_objects.end() || obj_it->value->type != Object::Type::Window)
+					it++;
+				else
+				{
+					(void)destroy_window(client_info, *it);
+					it = client_info.objects.begin();
+				}
+			}
+
 			for (auto id : client_info.objects)
 			{
 				auto it = g_objects.find(id);
@@ -304,14 +316,13 @@ int main()
 					case Object::Type::Pixmap:
 					case Object::Type::GraphicsContext:
 					case Object::Type::Font:
-					case Object::Type::Window:
 						break;
+					case Object::Type::Window:
+						ASSERT_NOT_REACHED();
 					case Object::Type::Extension:
-					{
 						auto& extension = object.object.get<Object::Extension>();
 						extension.destructor(extension);
 						break;
-					}
 				}
 
 				g_objects.remove(it);