fixup: fix breakage after hyprland#5762 + improve Hy3NodeData repr

Hy3NodeData now uses std::variant instead of a union, and all accesses
are checked.

flake.lock

@@ -41,16 +41,15 @@
         "xdph": "xdph"
       },
       "locked": {
-        "lastModified": 1713819507,
-        "narHash": "sha256-mG0kD8HmkCsHRkTBmqGb/QvM1vAvkAmB5p2H5XQ0zLo=",
+        "lastModified": 1714409407,
+        "narHash": "sha256-gc10Ag5O/s+EE24JZUXTpH4ogRsSyAfdgr7OvSNhQ8s=",
         "owner": "hyprwm",
         "repo": "Hyprland",
-        "rev": "da839f20f1b1a57ec78d6b041f8d1369150d253e",
+        "rev": "f2b03e9679bc1a091fecffd98b50a4179b5c7d43",
         "type": "github"
       },
       "original": {
         "owner": "hyprwm",
-        "ref": "da839f20f1b1a57ec78d6b041f8d1369150d253e",
         "repo": "Hyprland",
         "type": "github"
       }
@@ -117,11 +116,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1713730424,
-        "narHash": "sha256-MqYjTvQCxwuDIuAaqIEuyqserm5PYr0auiHHPuYFN/k=",
+        "lastModified": 1714171579,
+        "narHash": "sha256-eaWDIvt8ufUKKz3Lc2a3PyemLJG1m9RYlF+HP3hWbaw=",
         "owner": "hyprwm",
         "repo": "hyprwayland-scanner",
-        "rev": "7c9c8adfe7e424faa0c5ce6e8be90157fda53c06",
+        "rev": "126dad854f22fe30e6b82cd21808e76903d90ac5",
         "type": "github"
       },
       "original": {
@@ -132,11 +131,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1713537308,
-        "narHash": "sha256-XtTSSIB2DA6tOv+l0FhvfDMiyCmhoRbNB+0SeInZkbk=",
+        "lastModified": 1713714899,
+        "narHash": "sha256-+z/XjO3QJs5rLE5UOf015gdVauVRQd2vZtsFkaXBq2Y=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5c24cf2f0a12ad855f444c30b2421d044120c66f",
+        "rev": "6143fc5eeb9c4f00163267708e26191d1e918932",
         "type": "github"
       },
       "original": {

flake.nix

@@ -1,6 +1,6 @@
 {
   inputs = {
-    hyprland.url = "github:hyprwm/Hyprland?ref=da839f20f1b1a57ec78d6b041f8d1369150d253e";
+    hyprland.url = "github:hyprwm/Hyprland";
   };
 
   outputs = { self, hyprland, ... }: let

src/Hy3Layout.cpp

@@ -3,6 +3,7 @@
 
 #include <hyprland/src/Compositor.hpp>
 #include <hyprland/src/desktop/DesktopTypes.hpp>
+#include <hyprland/src/desktop/Workspace.hpp>
 #include <hyprland/src/plugins/PluginAPI.hpp>
 #include <ranges>
 
@@ -15,18 +16,18 @@ std::shared_ptr<HOOK_CALLBACK_FN> windowTitleHookPtr;
 std::shared_ptr<HOOK_CALLBACK_FN> urgentHookPtr;
 std::shared_ptr<HOOK_CALLBACK_FN> tickHookPtr;
 
-bool performContainment(Hy3Node& node, bool contained, CWindow* window) {
-	if (node.data.type == Hy3NodeType::Group) {
-		auto& group = node.data.as_group;
+bool performContainment(Hy3Node& node, bool contained, PHLWINDOW& window) {
+	if (node.data.is_group()) {
+		auto& group = node.data.as_group();
 		contained |= group.containment;
 
-		auto iter = node.data.as_group.children.begin();
-		while (iter != node.data.as_group.children.end()) {
-			switch ((*iter)->data.type) {
+		auto iter = group.children.begin();
+		while (iter != group.children.end()) {
+			switch ((*iter)->data.type()) {
 			case Hy3NodeType::Group: return performContainment(**iter, contained, window);
 			case Hy3NodeType::Window:
 				if (contained) {
-					auto wpid = (*iter)->data.as_window->getPID();
+					auto wpid = (*iter)->data.as_window()->getPID();
 					auto ppid = getPPIDof(window->getPID());
 					while (ppid > 10) { // `> 10` yoinked from HL swallow
 						if (ppid == wpid) {
@@ -58,7 +59,7 @@ bool performContainment(Hy3Node& node, bool contained, CWindow* window) {
 	return false;
 }
 
-void Hy3Layout::onWindowCreated(CWindow* window, eDirection direction) {
+void Hy3Layout::onWindowCreated(PHLWINDOW window, eDirection direction) {
 	for (auto& node: this->nodes) {
 		if (node.parent == nullptr && performContainment(node, false, window)) {
 			return;
@@ -68,11 +69,11 @@ void Hy3Layout::onWindowCreated(CWindow* window, eDirection direction) {
 	IHyprLayout::onWindowCreated(window, direction);
 }
 
-void Hy3Layout::onWindowCreatedTiling(CWindow* window, eDirection) {
+void Hy3Layout::onWindowCreatedTiling(PHLWINDOW window, eDirection) {
 	hy3_log(
 	    LOG,
 	    "onWindowCreatedTiling called with window {:x} (floating: {}, monitor: {}, workspace: {})",
-	    (uintptr_t) window,
+	    (uintptr_t) window.get(),
 	    window->m_bIsFloating,
 	    window->m_iMonitorID,
 	    window->m_pWorkspace->m_iID
@@ -85,7 +86,7 @@ void Hy3Layout::onWindowCreatedTiling(CWindow* window, eDirection) {
 		hy3_log(
 		    ERR,
 		    "onWindowCreatedTiling called with a window ({:x}) that is already tiled (node: {:x})",
-		    (uintptr_t) window,
+		    (uintptr_t) window.get(),
 		    (uintptr_t) existing
 		);
 		return;
@@ -142,16 +143,15 @@ void Hy3Layout::insertNode(Hy3Node& node) {
 	}
 
 	if (opening_after == nullptr) {
-		if (g_pCompositor->m_pLastWindow != nullptr
-		    && g_pCompositor->m_pLastWindow->m_pWorkspace == node.workspace
-		    && !g_pCompositor->m_pLastWindow->m_bIsFloating
-		    && (node.data.type == Hy3NodeType::Window
-		        || g_pCompositor->m_pLastWindow != node.data.as_window)
-		    && g_pCompositor->m_pLastWindow->m_bIsMapped)
+		auto last_window = g_pCompositor->m_pLastWindow.lock();
+		if (last_window != nullptr && last_window->m_pWorkspace == node.workspace
+		    && !last_window->m_bIsFloating
+		    && (node.data.is_window() || last_window != node.data.as_window())
+		    && last_window->m_bIsMapped)
 		{
-			opening_after = this->getNodeFromWindow(g_pCompositor->m_pLastWindow);
+			opening_after = this->getNodeFromWindow(last_window);
 		} else {
-			auto* mouse_window = g_pCompositor->vectorToWindowUnified(
+			auto mouse_window = g_pCompositor->vectorToWindowUnified(
 			    g_pInputManager->getMouseCoordsInternal(),
 			    RESERVED_EXTENTS | INPUT_EXTENTS
 			);
@@ -163,8 +163,8 @@ void Hy3Layout::insertNode(Hy3Node& node) {
 	}
 
 	if (opening_after != nullptr
-	    && ((node.data.type == Hy3NodeType::Group
-	         && (opening_after == &node || node.data.as_group.hasChild(opening_after)))
+	    && ((node.data.is_group()
+	         && (opening_after == &node || node.data.as_group().hasChild(opening_after)))
 	        || opening_after->reparenting))
 	{
 		opening_after = nullptr;
@@ -202,14 +202,14 @@ void Hy3Layout::insertNode(Hy3Node& node) {
 				    .layout = this,
 				});
 
-				parent.data.as_group.children.push_back(&this->nodes.back());
+				parent.data.as_group().children.push_back(&this->nodes.back());
 			}
 
 			opening_into = &this->nodes.back();
 		}
 	}
 
-	if (opening_into->data.type != Hy3NodeType::Group) {
+	if (opening_into->data.is_window()) {
 		hy3_log(ERR, "opening_into node ({:x}) was not a group node", (uintptr_t) opening_into);
 		errorNotif();
 		return;
@@ -236,7 +236,7 @@ void Hy3Layout::insertNode(Hy3Node& node) {
 
 		this->updateAutotileWorkspaces();
 
-		auto& target_group = opening_into->data.as_group;
+		auto& target_group = opening_into->data.as_group();
 		if (*at_enable && opening_after != nullptr && target_group.children.size() > 1
 		    && target_group.layout != Hy3GroupLayout::Tabbed
 		    && this->shouldAutotileWorkspace(opening_into->workspace))
@@ -261,9 +261,9 @@ void Hy3Layout::insertNode(Hy3Node& node) {
 	node.reparenting = false;
 
 	if (opening_after == nullptr) {
-		opening_into->data.as_group.children.push_back(&node);
+		opening_into->data.as_group().children.push_back(&node);
 	} else {
-		auto& children = opening_into->data.as_group.children;
+		auto& children = opening_into->data.as_group().children;
 		auto iter = std::find(children.begin(), children.end(), opening_after);
 		auto iter2 = std::next(iter);
 		children.insert(iter2, &node);
@@ -281,7 +281,7 @@ void Hy3Layout::insertNode(Hy3Node& node) {
 	opening_into->recalcSizePosRecursive();
 }
 
-void Hy3Layout::onWindowRemovedTiling(CWindow* window) {
+void Hy3Layout::onWindowRemovedTiling(PHLWINDOW window) {
 	static const auto node_collapse_policy =
 	    ConfigValue<Hyprlang::INT>("plugin:hy3:node_collapse_policy");
 
@@ -292,7 +292,7 @@ void Hy3Layout::onWindowRemovedTiling(CWindow* window) {
 	hy3_log(
 	    LOG,
 	    "removing window ({:x} as node {:x}) from node {:x}",
-	    (uintptr_t) window,
+	    (uintptr_t) window.get(),
 	    (uintptr_t) node,
 	    (uintptr_t) node->parent
 	);
@@ -310,17 +310,16 @@ void Hy3Layout::onWindowRemovedTiling(CWindow* window) {
 	this->nodes.remove(*node);
 	if (expand_actor != nullptr) expand_actor->recalcSizePosRecursive();
 
-	auto& group = parent->data.as_group;
-
 	if (parent != nullptr) {
+		auto& group = parent->data.as_group();
 		parent->recalcSizePosRecursive();
 
 		// returns if a given node is a group that can be collapsed given the current config
 		auto node_is_collapsible = [](Hy3Node* node) {
-			if (node->data.type != Hy3NodeType::Group) return false;
+			if (node->data.is_window()) return false;
 			if (*node_collapse_policy == 0) return true;
 			else if (*node_collapse_policy == 1) return false;
-			return node->parent->data.as_group.layout != Hy3GroupLayout::Tabbed;
+			return node->parent->data.as_group().layout != Hy3GroupLayout::Tabbed;
 		};
 
 		if (group.children.size() == 1
@@ -337,14 +336,14 @@ void Hy3Layout::onWindowRemovedTiling(CWindow* window) {
 	}
 }
 
-void Hy3Layout::onWindowFocusChange(CWindow* window) {
+void Hy3Layout::onWindowFocusChange(PHLWINDOW window) {
 	auto* node = this->getNodeFromWindow(window);
 	if (node == nullptr) return;
 
 	hy3_log(
 	    TRACE,
 	    "changing window focus to window {:x} as node {:x}",
-	    (uintptr_t) window,
+	    (uintptr_t) window.get(),
 	    (uintptr_t) node
 	);
 
@@ -353,7 +352,7 @@ void Hy3Layout::onWindowFocusChange(CWindow* window) {
 	node->recalcSizePosRecursive();
 }
 
-bool Hy3Layout::isWindowTiled(CWindow* window) {
+bool Hy3Layout::isWindowTiled(PHLWINDOW window) {
 	return this->getNodeFromWindow(window) != nullptr;
 }
 
@@ -386,7 +385,7 @@ void Hy3Layout::recalculateMonitor(const int& monitor_id) {
 	}
 }
 
-void Hy3Layout::recalculateWindow(CWindow* window) {
+void Hy3Layout::recalculateWindow(PHLWINDOW window) {
 	auto* node = this->getNodeFromWindow(window);
 	if (node == nullptr) return;
 	node->recalcSizePosRecursive();
@@ -402,9 +401,9 @@ ShiftDirection reverse(ShiftDirection direction) {
 	}
 }
 
-void Hy3Layout::resizeActiveWindow(const Vector2D& delta, eRectCorner corner, CWindow* pWindow) {
-	auto window = pWindow ? pWindow : g_pCompositor->m_pLastWindow;
-	if (!g_pCompositor->windowValidMapped(window)) return;
+void Hy3Layout::resizeActiveWindow(const Vector2D& delta, eRectCorner corner, PHLWINDOW pWindow) {
+	auto window = pWindow ? pWindow : g_pCompositor->m_pLastWindow.lock();
+	if (!valid(window)) return;
 
 	auto* node = this->getNodeFromWindow(window);
 
@@ -427,9 +426,9 @@ void Hy3Layout::resizeActiveWindow(const Vector2D& delta, eRectCorner corner, CW
 		);
 
 		Vector2D resize_delta = delta;
-		bool node_is_root = (node->data.type == Hy3NodeType::Group && node->parent == nullptr)
-		                 || (node->data.type == Hy3NodeType::Window
-		                     && (node->parent == nullptr || node->parent->parent == nullptr));
+		bool node_is_root =
+		    (node->data.is_group() && node->parent == nullptr)
+		    || (node->data.is_window() && (node->parent == nullptr || node->parent->parent == nullptr));
 
 		if (node_is_root) {
 			if (display_left && display_right) resize_delta.x = 0;
@@ -490,11 +489,10 @@ void Hy3Layout::resizeActiveWindow(const Vector2D& delta, eRectCorner corner, CW
 }
 
 void Hy3Layout::fullscreenRequestForWindow(
-    CWindow* window,
+    PHLWINDOW window,
     eFullscreenMode fullscreen_mode,
     bool on
 ) {
-	if (!g_pCompositor->windowValidMapped(window)) return;
 	if (on == window->m_bIsFullscreen || window->m_pWorkspace->m_bIsSpecialWorkspace) return;
 
 	const auto monitor = g_pCompositor->getMonitorFromID(window->m_iMonitorID);
@@ -575,7 +573,7 @@ std::any Hy3Layout::layoutMessage(SLayoutMessageHeader header, std::string conte
 	if (content == "togglesplit") {
 		auto* node = this->getNodeFromWindow(header.pWindow);
 		if (node != nullptr && node->parent != nullptr) {
-			auto& layout = node->parent->data.as_group.layout;
+			auto& layout = node->parent->data.as_group().layout;
 
 			switch (layout) {
 			case Hy3GroupLayout::SplitH:
@@ -594,13 +592,13 @@ std::any Hy3Layout::layoutMessage(SLayoutMessageHeader header, std::string conte
 	return "";
 }
 
-SWindowRenderLayoutHints Hy3Layout::requestRenderHints(CWindow* window) { return {}; }
+SWindowRenderLayoutHints Hy3Layout::requestRenderHints(PHLWINDOW window) { return {}; }
 
-void Hy3Layout::switchWindows(CWindow* pWindowA, CWindow* pWindowB) {
+void Hy3Layout::switchWindows(PHLWINDOW pWindowA, PHLWINDOW pWindowB) {
 	// todo
 }
 
-void Hy3Layout::moveWindowTo(CWindow* window, const std::string& direction, bool silent) {
+void Hy3Layout::moveWindowTo(PHLWINDOW window, const std::string& direction, bool silent) {
 	// todo: support silent
 	auto* node = this->getNodeFromWindow(window);
 	if (node == nullptr) return;
@@ -615,13 +613,13 @@ void Hy3Layout::moveWindowTo(CWindow* window, const std::string& direction, bool
 	this->shiftNode(*node, shift, false, false);
 }
 
-void Hy3Layout::alterSplitRatio(CWindow* pWindow, float delta, bool exact) {
+void Hy3Layout::alterSplitRatio(PHLWINDOW pWindow, float delta, bool exact) {
 	// todo
 }
 
 std::string Hy3Layout::getLayoutName() { return "hy3"; }
 
-CWindow* Hy3Layout::getNextWindowCandidate(CWindow* window) {
+PHLWINDOW Hy3Layout::getNextWindowCandidate(PHLWINDOW window) {
 	if (window->m_pWorkspace->m_bHasFullscreenWindow) {
 		return g_pCompositor->getFullscreenWindowOnWorkspace(window->m_pWorkspace->m_iID);
 	}
@@ -631,9 +629,9 @@ CWindow* Hy3Layout::getNextWindowCandidate(CWindow* window) {
 		for (auto& w: g_pCompositor->m_vWindows | std::views::reverse) {
 			if (w->m_bIsMapped && !w->isHidden() && w->m_bIsFloating && w->m_iX11Type != 2
 			    && w->m_pWorkspace == window->m_pWorkspace && !w->m_bX11ShouldntFocus
-			    && !w->m_sAdditionalConfigData.noFocus && w.get() != window)
+			    && !w->m_sAdditionalConfigData.noFocus && w != window)
 			{
-				return w.get();
+				return w;
 			}
 		}
 	}
@@ -641,26 +639,26 @@ CWindow* Hy3Layout::getNextWindowCandidate(CWindow* window) {
 	auto* node = this->getWorkspaceFocusedNode(window->m_pWorkspace, true);
 	if (node == nullptr) return nullptr;
 
-	switch (node->data.type) {
-	case Hy3NodeType::Window: return node->data.as_window;
-	case Hy3NodeType::Group: return nullptr;
-	default: return nullptr;
+	if (node->data.is_window()) {
+		return node->data.as_window();
+	} else {
+		return nullptr;
 	}
 }
 
-void Hy3Layout::replaceWindowDataWith(CWindow* from, CWindow* to) {
+void Hy3Layout::replaceWindowDataWith(PHLWINDOW from, PHLWINDOW to) {
 	auto* node = this->getNodeFromWindow(from);
 	if (node == nullptr) return;
 
-	node->data.as_window = to;
+	node->data.as_window() = to;
 	this->applyNodeDataToWindow(node);
 }
 
-bool Hy3Layout::isWindowReachable(CWindow* window) {
+bool Hy3Layout::isWindowReachable(PHLWINDOW window) {
 	return this->getNodeFromWindow(window) != nullptr || IHyprLayout::isWindowReachable(window);
 }
 
-void Hy3Layout::bringWindowToTop(CWindow* window) {
+void Hy3Layout::bringWindowToTop(PHLWINDOW window) {
 	auto node = this->getNodeFromWindow(window);
 	if (node == nullptr) return;
 	node->bringToTop();
@@ -671,12 +669,17 @@ void Hy3Layout::onEnable() {
 		if (window->isHidden() || !window->m_bIsMapped || window->m_bFadingOut || window->m_bIsFloating)
 			continue;
 
-		this->onWindowCreatedTiling(window.get());
+		this->onWindowCreatedTiling(window);
 	}
 
 	renderHookPtr = HyprlandAPI::registerCallbackDynamic(PHANDLE, "render", &Hy3Layout::renderHook);
-	windowTitleHookPtr = HyprlandAPI::registerCallbackDynamic(PHANDLE, "windowTitle", &Hy3Layout::windowGroupUpdateRecursiveHook);
-	urgentHookPtr = HyprlandAPI::registerCallbackDynamic(PHANDLE, "urgent", &Hy3Layout::windowGroupUrgentHook);
+	windowTitleHookPtr = HyprlandAPI::registerCallbackDynamic(
+	    PHANDLE,
+	    "windowTitle",
+	    &Hy3Layout::windowGroupUpdateRecursiveHook
+	);
+	urgentHookPtr =
+	    HyprlandAPI::registerCallbackDynamic(PHANDLE, "urgent", &Hy3Layout::windowGroupUrgentHook);
 	tickHookPtr = HyprlandAPI::registerCallbackDynamic(PHANDLE, "tick", &Hy3Layout::tickHook);
 	selection_hook::enable();
 }
@@ -689,8 +692,8 @@ void Hy3Layout::onDisable() {
 	selection_hook::disable();
 
 	for (auto& node: this->nodes) {
-		if (node.data.type == Hy3NodeType::Window) {
-			node.data.as_window->setHidden(false);
+		if (node.data.is_window()) {
+			node.data.as_window()->setHidden(false);
 		}
 	}
 
@@ -757,7 +760,7 @@ void Hy3Layout::makeGroupOn(
 	if (node == nullptr) return;
 
 	if (node->parent != nullptr) {
-		auto& group = node->parent->data.as_group;
+		auto& group = node->parent->data.as_group();
 		if (group.children.size() == 1) {
 			group.setLayout(layout);
 			group.setEphemeral(ephemeral);
@@ -778,7 +781,7 @@ void Hy3Layout::makeOppositeGroupOn(Hy3Node* node, GroupEphemeralityOption ephem
 		return;
 	}
 
-	auto& group = node->parent->data.as_group;
+	auto& group = node->parent->data.as_group();
 	auto layout =
 	    group.layout == Hy3GroupLayout::SplitH ? Hy3GroupLayout::SplitV : Hy3GroupLayout::SplitH;
 
@@ -798,7 +801,7 @@ void Hy3Layout::changeGroupOn(Hy3Node& node, Hy3GroupLayout layout) {
 		return;
 	}
 
-	auto& group = node.parent->data.as_group;
+	auto& group = node.parent->data.as_group();
 	group.setLayout(layout);
 	node.parent->updateTabBarRecursive();
 	node.parent->recalcSizePosRecursive();
@@ -807,7 +810,7 @@ void Hy3Layout::changeGroupOn(Hy3Node& node, Hy3GroupLayout layout) {
 void Hy3Layout::untabGroupOn(Hy3Node& node) {
 	if (node.parent == nullptr) return;
 
-	auto& group = node.parent->data.as_group;
+	auto& group = node.parent->data.as_group();
 	if (group.layout != Hy3GroupLayout::Tabbed) return;
 
 	changeGroupOn(node, group.previous_nontab_layout);
@@ -816,7 +819,7 @@ void Hy3Layout::untabGroupOn(Hy3Node& node) {
 void Hy3Layout::toggleTabGroupOn(Hy3Node& node) {
 	if (node.parent == nullptr) return;
 
-	auto& group = node.parent->data.as_group;
+	auto& group = node.parent->data.as_group();
 	if (group.layout != Hy3GroupLayout::Tabbed) changeGroupOn(node, Hy3GroupLayout::Tabbed);
 	else changeGroupOn(node, group.previous_nontab_layout);
 }
@@ -824,7 +827,7 @@ void Hy3Layout::toggleTabGroupOn(Hy3Node& node) {
 void Hy3Layout::changeGroupToOppositeOn(Hy3Node& node) {
 	if (node.parent == nullptr) return;
 
-	auto& group = node.parent->data.as_group;
+	auto& group = node.parent->data.as_group();
 
 	if (group.layout == Hy3GroupLayout::Tabbed) {
 		group.setLayout(group.previous_nontab_layout);
@@ -840,16 +843,16 @@ void Hy3Layout::changeGroupToOppositeOn(Hy3Node& node) {
 void Hy3Layout::changeGroupEphemeralityOn(Hy3Node& node, bool ephemeral) {
 	if (node.parent == nullptr) return;
 
-	auto& group = node.parent->data.as_group;
+	auto& group = node.parent->data.as_group();
 	group.setEphemeral(
 	    ephemeral ? GroupEphemeralityOption::ForceEphemeral : GroupEphemeralityOption::Standard
 	);
 }
 
 void Hy3Layout::shiftNode(Hy3Node& node, ShiftDirection direction, bool once, bool visible) {
-	if (once && node.parent != nullptr && node.parent->data.as_group.children.size() == 1) {
+	if (once && node.parent != nullptr && node.parent->data.as_group().children.size() == 1) {
 		if (node.parent->parent == nullptr) {
-			node.parent->data.as_group.setLayout(Hy3GroupLayout::SplitH);
+			node.parent->data.as_group().setLayout(Hy3GroupLayout::SplitH);
 			node.parent->recalcSizePosRecursive();
 		} else {
 			auto* node2 = node.parent;
@@ -876,13 +879,13 @@ void Hy3Layout::shiftWindow(
 }
 
 void Hy3Layout::shiftFocus(const PHLWORKSPACE& workspace, ShiftDirection direction, bool visible) {
-	auto* current_window = g_pCompositor->m_pLastWindow;
+	auto current_window = g_pCompositor->m_pLastWindow.lock();
 
 	if (current_window != nullptr) {
 		if (current_window->m_pWorkspace->m_bHasFullscreenWindow) return;
 
 		if (current_window->m_bIsFloating) {
-			auto* next_window = g_pCompositor->getWindowInDirection(
+			auto next_window = g_pCompositor->getWindowInDirection(
 			    current_window,
 			    direction == ShiftDirection::Left   ? 'l'
 			    : direction == ShiftDirection::Up   ? 'u'
@@ -910,13 +913,13 @@ void Hy3Layout::shiftFocus(const PHLWORKSPACE& workspace, ShiftDirection directi
 void changeNodeWorkspaceRecursive(Hy3Node& node, const PHLWORKSPACE& workspace) {
 	node.workspace = workspace;
 
-	if (node.data.type == Hy3NodeType::Window) {
-		auto* window = node.data.as_window;
+	if (node.data.is_window()) {
+		auto window = node.data.as_window();
 		window->moveToWorkspace(workspace);
 		window->updateToplevel();
 		window->updateDynamicRules();
 	} else {
-		for (auto* child: node.data.as_group.children) {
+		for (auto* child: node.data.as_group().children) {
 			changeNodeWorkspaceRecursive(*child, workspace);
 		}
 	}
@@ -936,7 +939,7 @@ void Hy3Layout::moveNodeToWorkspace(const PHLWORKSPACE& origin, std::string wsna
 	if (origin == workspace) return;
 
 	auto* node = this->getWorkspaceFocusedNode(origin);
-	auto* focused_window = g_pCompositor->m_pLastWindow;
+	auto focused_window = g_pCompositor->m_pLastWindow.lock();
 	auto* focused_window_node = this->getNodeFromWindow(focused_window);
 
 	auto origin_ws = node != nullptr           ? node->workspace
@@ -1013,14 +1016,14 @@ void Hy3Layout::changeFocus(const PHLWORKSPACE& workspace, FocusShift shift) {
 		}
 		return;
 	case FocusShift::Lower:
-		if (node->data.type == Hy3NodeType::Group && node->data.as_group.focused_child != nullptr)
-			node->data.as_group.focused_child->focus();
+		if (node->data.is_group() && node->data.as_group().focused_child != nullptr)
+			node->data.as_group().focused_child->focus();
 		return;
 	case FocusShift::Tab:
 		// make sure we go up at least one level
 		if (node->parent != nullptr) node = node->parent;
 		while (node->parent != nullptr) {
-			if (node->data.as_group.layout == Hy3GroupLayout::Tabbed) {
+			if (node->data.as_group().layout == Hy3GroupLayout::Tabbed) {
 				node->focus();
 				return;
 			}
@@ -1032,7 +1035,7 @@ void Hy3Layout::changeFocus(const PHLWORKSPACE& workspace, FocusShift shift) {
 		// make sure we go up at least one level
 		if (node->parent != nullptr) node = node->parent;
 		while (node->parent != nullptr) {
-			if (node->parent->data.as_group.layout == Hy3GroupLayout::Tabbed) {
+			if (node->parent->data.as_group().layout == Hy3GroupLayout::Tabbed) {
 				node->focus();
 				return;
 			}
@@ -1043,8 +1046,8 @@ void Hy3Layout::changeFocus(const PHLWORKSPACE& workspace, FocusShift shift) {
 	}
 
 bottom:
-	while (node->data.type == Hy3NodeType::Group && node->data.as_group.focused_child != nullptr) {
-		node = node->data.as_group.focused_child;
+	while (node->data.is_group() && node->data.as_group().focused_child != nullptr) {
+		node = node->data.as_group().focused_child;
 	}
 
 	node->focus();
@@ -1067,19 +1070,19 @@ Hy3Node* findTabBarAt(Hy3Node& node, Vector2D pos, Hy3Node** focused_node) {
 		inset += gaps_in->left;
 	}
 
-	if (node.data.type == Hy3NodeType::Group) {
+	if (node.data.is_group()) {
 		if (node.hidden) return nullptr;
 		// note: tab bar clicks ignore animations
 		if (node.position.x > pos.x || node.position.y > pos.y || node.position.x + node.size.x < pos.x
 		    || node.position.y + node.size.y < pos.y)
 			return nullptr;
 
-		if (node.data.as_group.layout == Hy3GroupLayout::Tabbed
-		    && node.data.as_group.tab_bar != nullptr)
-		{
+		auto& group = node.data.as_group();
+
+		if (group.layout == Hy3GroupLayout::Tabbed && node.data.as_group().tab_bar != nullptr) {
 			if (pos.y < node.position.y + node.gap_topleft_offset.y + inset) {
-				auto& children = node.data.as_group.children;
-				auto& tab_bar = *node.data.as_group.tab_bar;
+				auto& children = group.children;
+				auto& tab_bar = *group.tab_bar;
 
 				auto size = tab_bar.size.value();
 				auto x = pos.x - tab_bar.pos.value().x;
@@ -1099,11 +1102,11 @@ Hy3Node* findTabBarAt(Hy3Node& node, Vector2D pos, Hy3Node** focused_node) {
 				}
 			}
 
-			if (node.data.as_group.focused_child != nullptr) {
-				return findTabBarAt(*node.data.as_group.focused_child, pos, focused_node);
+			if (group.focused_child != nullptr) {
+				return findTabBarAt(*group.focused_child, pos, focused_node);
 			}
 		} else {
-			for (auto child: node.data.as_group.children) {
+			for (auto child: group.children) {
 				if (findTabBarAt(*child, pos, focused_node)) return child;
 			}
 		}
@@ -1144,22 +1147,21 @@ void Hy3Layout::focusTab(
 		tab_node = this->getWorkspaceFocusedNode(workspace);
 		if (tab_node == nullptr) return;
 
-		while (tab_node != nullptr && tab_node->data.as_group.layout != Hy3GroupLayout::Tabbed
+		while (tab_node != nullptr && tab_node->data.as_group().layout != Hy3GroupLayout::Tabbed
 		       && tab_node->parent != nullptr)
 			tab_node = tab_node->parent;
 
-		if (tab_node == nullptr || tab_node->data.type != Hy3NodeType::Group
-		    || tab_node->data.as_group.layout != Hy3GroupLayout::Tabbed)
+		if (tab_node == nullptr || tab_node->data.is_window()
+		    || tab_node->data.as_group().layout != Hy3GroupLayout::Tabbed)
 			return;
 	}
 
 hastab:
 	if (target != TabFocus::MouseLocation) {
-		if (tab_node->data.as_group.focused_child == nullptr
-		    || tab_node->data.as_group.children.size() < 2)
-			return;
+		auto& group = tab_node->data.as_group();
+		if (group.focused_child == nullptr || group.children.size() < 2) return;
 
-		auto& children = tab_node->data.as_group.children;
+		auto& children = group.children;
 		if (target == TabFocus::Index) {
 			int i = 1;
 
@@ -1175,8 +1177,7 @@ hastab:
 			return;
 		cont:;
 		} else {
-			auto node_iter =
-			    std::find(children.begin(), children.end(), tab_node->data.as_group.focused_child);
+			auto node_iter = std::find(children.begin(), children.end(), group.focused_child);
 			if (node_iter == children.end()) return;
 			if (target == TabFocus::Left) {
 				if (node_iter == children.begin()) {
@@ -1197,9 +1198,9 @@ hastab:
 	}
 
 	auto* focus = tab_focused_node;
-	while (focus->data.type == Hy3NodeType::Group && !focus->data.as_group.group_focused
-	       && focus->data.as_group.focused_child != nullptr)
-		focus = focus->data.as_group.focused_child;
+	while (focus->data.is_group() && !focus->data.as_group().group_focused
+	       && focus->data.as_group().focused_child != nullptr)
+		focus = focus->data.as_group().focused_child;
 
 	focus->focus();
 	tab_node->recalcSizePosRecursive();
@@ -1209,7 +1210,7 @@ void Hy3Layout::setNodeSwallow(const PHLWORKSPACE& workspace, SetSwallowOption o
 	auto* node = this->getWorkspaceFocusedNode(workspace);
 	if (node == nullptr || node->parent == nullptr) return;
 
-	auto* containment = &node->parent->data.as_group.containment;
+	auto* containment = &node->parent->data.as_group().containment;
 	switch (option) {
 	case SetSwallowOption::NoSwallow: *containment = false; break;
 	case SetSwallowOption::Swallow: *containment = true; break;
@@ -1218,16 +1219,17 @@ void Hy3Layout::setNodeSwallow(const PHLWORKSPACE& workspace, SetSwallowOption o
 }
 
 void Hy3Layout::killFocusedNode(const PHLWORKSPACE& workspace) {
-	if (g_pCompositor->m_pLastWindow != nullptr && g_pCompositor->m_pLastWindow->m_bIsFloating) {
-		g_pCompositor->closeWindow(g_pCompositor->m_pLastWindow);
+	auto last_window = g_pCompositor->m_pLastWindow.lock();
+	if (last_window != nullptr && last_window->m_bIsFloating) {
+		g_pCompositor->closeWindow(last_window);
 	} else {
 		auto* node = this->getWorkspaceFocusedNode(workspace);
 		if (node == nullptr) return;
 
-		std::vector<CWindow*> windows;
+		std::vector<PHLWINDOW> windows;
 		node->appendAllWindows(windows);
 
-		for (auto* window: windows) {
+		for (auto& window: windows) {
 			window->setHidden(false);
 			g_pCompositor->closeWindow(window);
 		}
@@ -1241,6 +1243,7 @@ void Hy3Layout::expand(
 ) {
 	auto* node = this->getWorkspaceFocusedNode(workspace, false, true);
 	if (node == nullptr) return;
+	PHLWINDOW window;
 
 	const auto monitor = g_pCompositor->getMonitorFromID(workspace->m_iMonitorID);
 
@@ -1254,10 +1257,10 @@ void Hy3Layout::expand(
 			}
 		}
 
-		if (node->data.type == Hy3NodeType::Group && !node->data.as_group.group_focused)
-			node->data.as_group.expand_focused = ExpandFocusType::Stack;
+		if (node->data.is_group() && !node->data.as_group().group_focused)
+			node->data.as_group().expand_focused = ExpandFocusType::Stack;
 
-		auto& group = node->parent->data.as_group;
+		auto& group = node->parent->data.as_group();
 		group.focused_child = node;
 		group.expand_focused = ExpandFocusType::Latch;
 
@@ -1272,19 +1275,19 @@ void Hy3Layout::expand(
 		}
 	} break;
 	case ExpandOption::Shrink:
-		if (node->data.type == Hy3NodeType::Group) {
-			auto& group = node->data.as_group;
+		if (node->data.is_group()) {
+			auto& group = node->data.as_group();
 
 			group.expand_focused = ExpandFocusType::NotExpanded;
-			if (group.focused_child->data.type == Hy3NodeType::Group)
-				group.focused_child->data.as_group.expand_focused = ExpandFocusType::Latch;
+			if (group.focused_child->data.is_group())
+				group.focused_child->data.as_group().expand_focused = ExpandFocusType::Latch;
 
 			node->recalcSizePosRecursive();
 		}
 		break;
 	case ExpandOption::Base: {
-		if (node->data.type == Hy3NodeType::Group) {
-			node->data.as_group.collapseExpansions();
+		if (node->data.is_group()) {
+			node->data.as_group().collapseExpansions();
 			node->recalcSizePosRecursive();
 		}
 		break;
@@ -1295,10 +1298,9 @@ void Hy3Layout::expand(
 
 	return;
 
-	CWindow* window;
 fullscreen:
-	if (node->data.type != Hy3NodeType::Window) return;
-	window = node->data.as_window;
+	if (node->data.is_group()) return;
+	window = node->data.as_window();
 	if (!window->m_bIsFullscreen || window->m_pWorkspace->m_bIsSpecialWorkspace) return;
 
 	if (workspace->m_bHasFullscreenWindow) return;
@@ -1322,31 +1324,30 @@ fsupdate:
 	this->recalculateMonitor(monitor->ID);
 }
 
-bool Hy3Layout::shouldRenderSelected(CWindow* window) {
+bool Hy3Layout::shouldRenderSelected(const PHLWINDOW& window) {
 	if (window == nullptr) return false;
 	auto* root = this->getWorkspaceRootGroup(window->m_pWorkspace);
-	if (root == nullptr || root->data.as_group.focused_child == nullptr) return false;
+	if (root == nullptr || root->data.as_group().focused_child == nullptr) return false;
 	auto* focused = root->getFocusedNode();
 	if (focused == nullptr
-	    || (focused->data.type == Hy3NodeType::Window
-	        && focused->data.as_window != g_pCompositor->m_pLastWindow))
+	    || (focused->data.is_window()
+	        && focused->data.as_window() != g_pCompositor->m_pLastWindow.lock()))
 		return false;
 
-	switch (focused->data.type) {
-	case Hy3NodeType::Window: return focused->data.as_window == window;
+	switch (focused->data.type()) {
+	case Hy3NodeType::Window: return focused->data.as_window() == window;
 	case Hy3NodeType::Group: {
 		auto* node = this->getNodeFromWindow(window);
 		if (node == nullptr) return false;
-		return focused->data.as_group.hasChild(node);
+		return focused->data.as_group().hasChild(node);
 	}
-	default: return false;
 	}
 }
 
 Hy3Node* Hy3Layout::getWorkspaceRootGroup(const PHLWORKSPACE& workspace) {
 	for (auto& node: this->nodes) {
-		if (node.workspace == workspace && node.parent == nullptr
-		    && node.data.type == Hy3NodeType::Group && !node.reparenting)
+		if (node.workspace == workspace && node.parent == nullptr && node.data.is_group()
+		    && !node.reparenting)
 		{
 			return &node;
 		}
@@ -1380,7 +1381,7 @@ void Hy3Layout::renderHook(void*, SCallbackInfo&, std::any data) {
 		if (!rendering_normally) break;
 
 		for (auto& entry: g_Hy3Layout->tab_groups) {
-			if (!entry.hidden && entry.target_window == g_pHyprOpenGL->m_pCurrentWindow
+			if (!entry.hidden && entry.target_window == g_pHyprOpenGL->m_pCurrentWindow.lock()
 			    && std::find(rendered_groups.begin(), rendered_groups.end(), &entry)
 			           == rendered_groups.end())
 			{
@@ -1409,18 +1410,17 @@ void Hy3Layout::renderHook(void*, SCallbackInfo&, std::any data) {
 }
 
 void Hy3Layout::windowGroupUrgentHook(void* p, SCallbackInfo& callback_info, std::any data) {
-	CWindow* window = std::any_cast<CWindow*>(data);
+	auto window = std::any_cast<PHLWINDOW>(data);
 	if (window == nullptr) return;
 	window->m_bIsUrgent = true;
 	Hy3Layout::windowGroupUpdateRecursiveHook(p, callback_info, data);
 }
 
 void Hy3Layout::windowGroupUpdateRecursiveHook(void*, SCallbackInfo&, std::any data) {
-	CWindow* window = std::any_cast<CWindow*>(data);
+	auto window = std::any_cast<PHLWINDOW>(data);
 	if (window == nullptr) return;
 	auto* node = g_Hy3Layout->getNodeFromWindow(window);
 
-	// it is UB for `this` to be null
 	if (node == nullptr) return;
 	node->updateTabBarRecursive();
 }
@@ -1435,9 +1435,9 @@ void Hy3Layout::tickHook(void*, SCallbackInfo&, std::any) {
 	}
 }
 
-Hy3Node* Hy3Layout::getNodeFromWindow(CWindow* window) {
+Hy3Node* Hy3Layout::getNodeFromWindow(const PHLWINDOW& window) {
 	for (auto& node: this->nodes) {
-		if (node.data.type == Hy3NodeType::Window && node.data.as_window == window) {
+		if (node.data.is_window() && node.data.as_window() == window) {
 			return &node;
 		}
 	}
@@ -1446,8 +1446,8 @@ Hy3Node* Hy3Layout::getNodeFromWindow(CWindow* window) {
 }
 
 void Hy3Layout::applyNodeDataToWindow(Hy3Node* node, bool no_animation) {
-	if (node->data.type != Hy3NodeType::Window) return;
-	auto* window = node->data.as_window;
+	if (node->data.is_group()) return;
+	auto window = node->data.as_window();
 	auto root_node = this->getWorkspaceRootGroup(window->m_pWorkspace);
 
 	CMonitor* monitor = nullptr;
@@ -1480,13 +1480,13 @@ void Hy3Layout::applyNodeDataToWindow(Hy3Node* node, bool no_animation) {
 	static const auto no_gaps_when_only = ConfigValue<Hyprlang::INT>("plugin:hy3:no_gaps_when_only");
 	// clang-format on
 
-	if (!g_pCompositor->windowExists(window) || !window->m_bIsMapped) {
+	if (!valid(window) || !window->m_bIsMapped) {
 		hy3_log(
 		    ERR,
 		    "node {:x} is an unmapped window ({:x}), cannot apply node data, removing from tiled "
 		    "layout",
 		    (uintptr_t) node,
-		    (uintptr_t) window
+		    (uintptr_t) window.get()
 		);
 		errorNotif();
 		this->onWindowRemovedTiling(window);
@@ -1501,8 +1501,8 @@ void Hy3Layout::applyNodeDataToWindow(Hy3Node* node, bool no_animation) {
 	window->m_vSize = nodeBox.size();
 	window->m_vPosition = nodeBox.pos();
 
-	auto only_node = root_node != nullptr && root_node->data.as_group.children.size() == 1
-	              && root_node->data.as_group.children.front()->data.type == Hy3NodeType::Window;
+	auto only_node = root_node != nullptr && root_node->data.as_group().children.size() == 1
+	              && root_node->data.as_group().children.front()->data.is_window();
 
 	if (!window->m_pWorkspace->m_bIsSpecialWorkspace
 	    && ((*no_gaps_when_only != 0 && (only_node || window->m_bIsFullscreen))
@@ -1589,7 +1589,7 @@ Hy3Node* Hy3Layout::shiftOrGetFocus(
 	while (true) {
 		if (break_parent == nullptr) return nullptr;
 
-		auto& group = break_parent->data.as_group; // must be a group in order to be a parent
+		auto& group = break_parent->data.as_group(); // must be a group in order to be a parent
 
 		if (shiftMatchesLayout(group.layout, direction)
 		    && (!visible || group.layout != Hy3GroupLayout::Tabbed))
@@ -1636,9 +1636,10 @@ Hy3Node* Hy3Layout::shiftOrGetFocus(
 
 				auto* newChild = &this->nodes.back();
 				Hy3Node::swapData(*break_parent, *newChild);
-				break_parent->data.as_group.children.push_back(newChild);
-				break_parent->data.as_group.group_focused = false;
-				break_parent->data.as_group.focused_child = newChild;
+				auto& group = break_parent->data.as_group();
+				group.children.push_back(newChild);
+				group.group_focused = false;
+				group.focused_child = newChild;
 				break_origin = newChild;
 			}
 
@@ -1649,7 +1650,7 @@ Hy3Node* Hy3Layout::shiftOrGetFocus(
 		}
 	}
 
-	auto& parent_group = break_parent->data.as_group;
+	auto& parent_group = break_parent->data.as_group();
 	Hy3Node* target_group = break_parent;
 	std::list<Hy3Node*>::iterator insert;
 
@@ -1660,15 +1661,15 @@ Hy3Node* Hy3Layout::shiftOrGetFocus(
 		if (!shift) return nullptr;
 		insert = parent_group.children.end();
 	} else {
-		auto& group_data = target_group->data.as_group;
+		auto& group_data = target_group->data.as_group();
 
 		auto iter = std::find(group_data.children.begin(), group_data.children.end(), break_origin);
 		if (shiftIsForward(direction)) iter = std::next(iter);
 		else iter = std::prev(iter);
 
-		if ((*iter)->data.type == Hy3NodeType::Window
-		    || ((*iter)->data.type == Hy3NodeType::Group
-		        && (*iter)->data.as_group.expand_focused != ExpandFocusType::NotExpanded)
+		if ((*iter)->data.is_window()
+		    || ((*iter)->data.is_group()
+		        && (*iter)->data.as_group().expand_focused != ExpandFocusType::NotExpanded)
 		    || (shift && once && has_broken_once))
 		{
 			if (shift) {
@@ -1684,7 +1685,7 @@ Hy3Node* Hy3Layout::shiftOrGetFocus(
 			// break into neighboring groups until we hit a window
 			while (true) {
 				target_group = *iter;
-				auto& group_data = target_group->data.as_group;
+				auto& group_data = target_group->data.as_group();
 
 				if (group_data.children.empty()) return nullptr; // in theory this would never happen
 
@@ -1735,9 +1736,9 @@ Hy3Node* Hy3Layout::shiftOrGetFocus(
 					break;
 				}
 
-				if ((*iter)->data.type == Hy3NodeType::Window
-				    || ((*iter)->data.type == Hy3NodeType::Group
-				        && (*iter)->data.as_group.expand_focused != ExpandFocusType::NotExpanded))
+				if ((*iter)->data.is_window()
+				    || ((*iter)->data.is_group()
+				        && (*iter)->data.as_group().expand_focused != ExpandFocusType::NotExpanded))
 				{
 					if (shift) {
 						if (shift_after) insert = std::next(iter);
@@ -1751,18 +1752,19 @@ Hy3Node* Hy3Layout::shiftOrGetFocus(
 		}
 	}
 
-	auto& group_data = target_group->data.as_group;
+	auto& group_data = target_group->data.as_group();
 
 	if (target_group == node.parent) {
 		// nullptr is used as a signal value instead of removing it first to avoid
 		// iterator invalidation.
 		auto iter = std::find(group_data.children.begin(), group_data.children.end(), &node);
 		*iter = nullptr;
-		target_group->data.as_group.children.insert(insert, &node);
-		target_group->data.as_group.children.remove(nullptr);
+		auto& group = target_group->data.as_group();
+		group.children.insert(insert, &node);
+		group.children.remove(nullptr);
 		target_group->recalcSizePosRecursive();
 	} else {
-		target_group->data.as_group.children.insert(insert, &node);
+		target_group->data.as_group().children.insert(insert, &node);
 
 		// must happen AFTER `insert` is used
 		auto* old_parent = node.removeFromParentRecursive(nullptr);
@@ -1770,7 +1772,7 @@ Hy3Node* Hy3Layout::shiftOrGetFocus(
 		node.size_ratio = 1.0;
 
 		if (old_parent != nullptr) {
-			auto& group = old_parent->data.as_group;
+			auto& group = old_parent->data.as_group();
 			if (old_parent->parent != nullptr && group.ephemeral && group.children.size() == 1
 			    && !group.hasChild(&node))
 			{

src/Hy3Layout.hpp

@@ -70,30 +70,30 @@ enum class ExpandFullscreenOption {
 
 class Hy3Layout: public IHyprLayout {
 public:
-	virtual void onWindowCreated(CWindow*, eDirection = DIRECTION_DEFAULT);
-	virtual void onWindowCreatedTiling(CWindow*, eDirection = DIRECTION_DEFAULT);
-	virtual void onWindowRemovedTiling(CWindow*);
-	virtual void onWindowFocusChange(CWindow*);
-	virtual bool isWindowTiled(CWindow*);
-	virtual void recalculateMonitor(const int& monitor_id);
-	virtual void recalculateWindow(CWindow*);
-	virtual void
-	resizeActiveWindow(const Vector2D& delta, eRectCorner corner, CWindow* pWindow = nullptr);
-	virtual void fullscreenRequestForWindow(CWindow*, eFullscreenMode, bool enable_fullscreen);
-	virtual std::any layoutMessage(SLayoutMessageHeader header, std::string content);
-	virtual SWindowRenderLayoutHints requestRenderHints(CWindow*);
-	virtual void switchWindows(CWindow*, CWindow*);
-	virtual void moveWindowTo(CWindow*, const std::string& direction, bool silent);
-	virtual void alterSplitRatio(CWindow*, float, bool);
-	virtual std::string getLayoutName();
-	virtual CWindow* getNextWindowCandidate(CWindow*);
-	virtual void replaceWindowDataWith(CWindow* from, CWindow* to);
-	virtual bool isWindowReachable(CWindow*);
-	virtual void bringWindowToTop(CWindow*);
-	virtual Vector2D predictSizeForNewWindowTiled() { return Vector2D(); }
+	void onWindowCreated(PHLWINDOW, eDirection = DIRECTION_DEFAULT) override;
+	void onWindowCreatedTiling(PHLWINDOW, eDirection = DIRECTION_DEFAULT) override;
+	void onWindowRemovedTiling(PHLWINDOW) override;
+	void onWindowFocusChange(PHLWINDOW) override;
+	bool isWindowTiled(PHLWINDOW) override;
+	void recalculateMonitor(const int& monitor_id) override;
+	void recalculateWindow(PHLWINDOW) override;
+	void resizeActiveWindow(const Vector2D& delta, eRectCorner corner, PHLWINDOW pWindow = nullptr)
+	    override;
+	void fullscreenRequestForWindow(PHLWINDOW, eFullscreenMode, bool enable_fullscreen) override;
+	std::any layoutMessage(SLayoutMessageHeader header, std::string content) override;
+	SWindowRenderLayoutHints requestRenderHints(PHLWINDOW) override;
+	void switchWindows(PHLWINDOW, PHLWINDOW) override;
+	void moveWindowTo(PHLWINDOW, const std::string& direction, bool silent) override;
+	void alterSplitRatio(PHLWINDOW, float, bool) override;
+	std::string getLayoutName() override;
+	PHLWINDOW getNextWindowCandidate(PHLWINDOW) override;
+	void replaceWindowDataWith(PHLWINDOW from, PHLWINDOW to) override;
+	bool isWindowReachable(PHLWINDOW) override;
+	void bringWindowToTop(PHLWINDOW) override;
+	Vector2D predictSizeForNewWindowTiled() override { return Vector2D(); }
 
-	virtual void onEnable();
-	virtual void onDisable();
+	void onEnable() override;
+	void onDisable() override;
 
 	void insertNode(Hy3Node& node);
 	void makeGroupOnWorkspace(const PHLWORKSPACE& workspace, Hy3GroupLayout, GroupEphemeralityOption);
@@ -126,7 +126,7 @@ public:
 	void killFocusedNode(const PHLWORKSPACE& workspace);
 	void expand(const PHLWORKSPACE& workspace, ExpandOption, ExpandFullscreenOption);
 
-	bool shouldRenderSelected(CWindow*);
+	bool shouldRenderSelected(const PHLWINDOW&);
 
 	Hy3Node* getWorkspaceRootGroup(const PHLWORKSPACE& workspace);
 	Hy3Node* getWorkspaceFocusedNode(
@@ -144,7 +144,7 @@ public:
 	std::list<Hy3TabGroup> tab_groups;
 
 private:
-	Hy3Node* getNodeFromWindow(CWindow*);
+	Hy3Node* getNodeFromWindow(const PHLWINDOW&);
 	void applyNodeDataToWindow(Hy3Node*, bool no_animation = false);
 
 	// if shift is true, shift the window in the given direction, returning

src/Hy3Node.cpp

@@ -1,6 +1,10 @@
 #include <sstream>
+#include <stdexcept>
+#include <variant>
 
+#include <bits/ranges_util.h>
 #include <hyprland/src/Compositor.hpp>
+#include <hyprland/src/defines.hpp>
 #include <hyprland/src/helpers/Box.hpp>
 #include <hyprland/src/plugins/PluginAPI.hpp>
 
@@ -37,8 +41,8 @@ bool Hy3GroupData::hasChild(Hy3Node* node) {
 	for (auto child: this->children) {
 		if (child == node) return true;
 
-		if (child->data.type == Hy3NodeType::Group) {
-			if (child->data.as_group.hasChild(node)) return true;
+		if (child->data.is_group()) {
+			if (child->data.as_group().hasChild(node)) return true;
 		}
 	}
 
@@ -51,11 +55,10 @@ void Hy3GroupData::collapseExpansions() {
 
 	Hy3Node* node = this->focused_child;
 
-	while (node->data.type == Hy3NodeType::Group
-	       && node->data.as_group.expand_focused == ExpandFocusType::Stack)
-	{
-		node->data.as_group.expand_focused = ExpandFocusType::NotExpanded;
-		node = node->data.as_group.focused_child;
+	while (node->data.is_group() && node->data.as_group().expand_focused == ExpandFocusType::Stack) {
+		auto& group = node->data.as_group();
+		group.expand_focused = ExpandFocusType::NotExpanded;
+		node = group.focused_child;
 	}
 }
 
@@ -79,64 +82,83 @@ void Hy3GroupData::setEphemeral(GroupEphemeralityOption ephemeral) {
 
 // Hy3NodeData //
 
-Hy3NodeData::Hy3NodeData(): Hy3NodeData((CWindow*) nullptr) {}
+Hy3NodeData::Hy3NodeData(Hy3GroupLayout layout) { this->data.emplace<1>(layout); }
 
-Hy3NodeData::Hy3NodeData(CWindow* window): type(Hy3NodeType::Window) { this->as_window = window; }
+Hy3NodeData::Hy3NodeData(PHLWINDOW window) { this->data.emplace<0>(window); }
 
-Hy3NodeData::Hy3NodeData(Hy3GroupLayout layout): Hy3NodeData(Hy3GroupData(layout)) {}
+Hy3NodeData::Hy3NodeData(Hy3GroupData group) { this->data.emplace<1>(std::move(group)); }
 
-Hy3NodeData::Hy3NodeData(Hy3GroupData group): type(Hy3NodeType::Group) {
-	new (&this->as_group) Hy3GroupData(std::move(group));
-}
-
-Hy3NodeData::Hy3NodeData(Hy3NodeData&& from): type(from.type) {
-	switch (from.type) {
-	case Hy3NodeType::Window: this->as_window = from.as_window; break;
-	case Hy3NodeType::Group: new (&this->as_group) Hy3GroupData(std::move(from.as_group)); break;
+Hy3NodeData::Hy3NodeData(Hy3NodeData&& node) {
+	if (std::holds_alternative<PHLWINDOWREF>(node.data)) {
+		this->data.emplace<0>(std::get<PHLWINDOWREF>(node.data));
+	} else if (std::holds_alternative<Hy3GroupData>(node.data)) {
+		this->data.emplace<1>(std::move(std::get<Hy3GroupData>(node.data)));
 	}
 }
 
-Hy3NodeData::~Hy3NodeData() {
-	switch (this->type) {
-	case Hy3NodeType::Window: break;
-	case Hy3NodeType::Group:
-		this->as_group.~Hy3GroupData();
-
-		// who ever thought calling the dtor after a move was a good idea?
-		this->type = Hy3NodeType::Window;
-		break;
-	}
-}
-
-Hy3NodeData& Hy3NodeData::operator=(CWindow* window) {
+Hy3NodeData& Hy3NodeData::operator=(PHLWINDOW window) {
 	*this = Hy3NodeData(window);
-
 	return *this;
 }
 
 Hy3NodeData& Hy3NodeData::operator=(Hy3GroupLayout layout) {
 	*this = Hy3NodeData(layout);
-
 	return *this;
 }
 
 Hy3NodeData& Hy3NodeData::operator=(Hy3NodeData&& from) {
-	if (this->type == Hy3NodeType::Group) {
-		this->as_group.~Hy3GroupData();
-	}
-
-	this->type = from.type;
-
-	switch (this->type) {
-	case Hy3NodeType::Window: this->as_window = from.as_window; break;
-	case Hy3NodeType::Group: new (&this->as_group) Hy3GroupData(std::move(from.as_group)); break;
-	}
-
+	this->~Hy3NodeData();
+	new (this) Hy3NodeData(std::move(from));
 	return *this;
 }
 
 bool Hy3NodeData::operator==(const Hy3NodeData& rhs) const { return this == &rhs; }
 
+bool Hy3NodeData::valid() const {
+	if (std::holds_alternative<Hy3GroupData>(this->data)) {
+		return true;
+	} else if (std::holds_alternative<PHLWINDOWREF>(this->data)) {
+		return !std::get<PHLWINDOWREF>(this->data).expired();
+	} else {
+		return false;
+	}
+}
+
+Hy3NodeType Hy3NodeData::type() const {
+	if (std::holds_alternative<Hy3GroupData>(this->data)) {
+		return Hy3NodeType::Group;
+	} else if (std::holds_alternative<PHLWINDOWREF>(this->data)) {
+		return Hy3NodeType::Window;
+	} else {
+		throw std::runtime_error("Attempted to get Hy3NodeType of uninitialized Hy3NodeData");
+	}
+}
+
+bool Hy3NodeData::is_group() const { return this->type() == Hy3NodeType::Group; }
+
+bool Hy3NodeData::is_window() const { return this->type() == Hy3NodeType::Window; }
+
+Hy3GroupData& Hy3NodeData::as_group() {
+	if (std::holds_alternative<Hy3GroupData>(this->data)) {
+		return std::get<Hy3GroupData>(this->data);
+	} else {
+		throw std::runtime_error("Attempted to get group value of a non-group Hy3NodeData");
+	}
+}
+
+PHLWINDOW Hy3NodeData::as_window() {
+	if (std::holds_alternative<PHLWINDOWREF>(this->data)) {
+		auto& ref = std::get<PHLWINDOWREF>(this->data);
+		if (ref.expired()) {
+			throw std::runtime_error("Attempted to upgrade an expired Hy3NodeData of a window");
+		} else {
+			return ref.lock();
+		}
+	} else {
+		throw std::runtime_error("Attempted to get window value of a non-window Hy3NodeData");
+	}
+}
+
 // Hy3Node //
 
 bool Hy3Node::operator==(const Hy3Node& rhs) const { return this->data == rhs.data; }
@@ -144,10 +166,10 @@ bool Hy3Node::operator==(const Hy3Node& rhs) const { return this->data == rhs.da
 void Hy3Node::focus() {
 	this->markFocused();
 
-	switch (this->data.type) {
+	switch (this->data.type()) {
 	case Hy3NodeType::Window:
-		this->data.as_window->setHidden(false);
-		g_pCompositor->focusWindow(this->data.as_window);
+		this->data.as_window()->setHidden(false);
+		g_pCompositor->focusWindow(this->data.as_window());
 		break;
 	case Hy3NodeType::Group:
 		g_pCompositor->focusWindow(nullptr);
@@ -156,39 +178,41 @@ void Hy3Node::focus() {
 	}
 }
 
-CWindow* Hy3Node::bringToTop() {
-	switch (this->data.type) {
-	case Hy3NodeType::Window:
+PHLWINDOW Hy3Node::bringToTop() {
+	switch (this->data.type()) {
+	case Hy3NodeType::Window: {
 		this->markFocused();
-		this->data.as_window->setHidden(false);
-
-		return this->data.as_window;
-	case Hy3NodeType::Group:
-		if (this->data.as_group.layout == Hy3GroupLayout::Tabbed) {
-			if (this->data.as_group.focused_child != nullptr) {
-				return this->data.as_group.focused_child->bringToTop();
+		auto window = this->data.as_window();
+		window->setHidden(false);
+		return window;
+	}
+	case Hy3NodeType::Group: {
+		auto& group = this->data.as_group();
+		if (group.layout == Hy3GroupLayout::Tabbed) {
+			if (group.focused_child != nullptr) {
+				return group.focused_child->bringToTop();
 			}
 		} else {
-			for (auto* node: this->data.as_group.children) {
-				auto* window = node->bringToTop();
+			for (auto* node: group.children) {
+				auto window = node->bringToTop();
 				if (window != nullptr) return window;
 			}
 		}
 
 		return nullptr;
-	default: return nullptr;
+	}
 	}
 }
 
 void Hy3Node::focusWindow() {
-	auto* window = this->bringToTop();
+	auto window = this->bringToTop();
 	if (window != nullptr) g_pCompositor->focusWindow(window);
 }
 
 void markGroupFocusedRecursive(Hy3GroupData& group) {
 	group.group_focused = true;
 	for (auto& child: group.children) {
-		if (child->data.type == Hy3NodeType::Group) markGroupFocusedRecursive(child->data.as_group);
+		if (child->data.is_group()) markGroupFocusedRecursive(child->data.as_group());
 	}
 }
 
@@ -200,14 +224,15 @@ void Hy3Node::markFocused() {
 	while (root->parent != nullptr) root = root->parent;
 
 	// update focus
-	if (this->data.type == Hy3NodeType::Group) {
-		markGroupFocusedRecursive(this->data.as_group);
+	if (this->data.is_group()) {
+		markGroupFocusedRecursive(this->data.as_group());
 	}
 
 	auto* node2 = node;
 	while (node2->parent != nullptr) {
-		node2->parent->data.as_group.focused_child = node2;
-		node2->parent->data.as_group.group_focused = false;
+		auto& group = node2->parent->data.as_group();
+		group.focused_child = node2;
+		group.group_focused = false;
 		node2 = node2->parent;
 	}
 
@@ -215,10 +240,10 @@ void Hy3Node::markFocused() {
 }
 
 void Hy3Node::raiseToTop() {
-	switch (this->data.type) {
-	case Hy3NodeType::Window: g_pCompositor->changeWindowZOrder(this->data.as_window, true); break;
+	switch (this->data.type()) {
+	case Hy3NodeType::Window: g_pCompositor->changeWindowZOrder(this->data.as_window(), true); break;
 	case Hy3NodeType::Group:
-		for (auto* child: this->data.as_group.children) {
+		for (auto* child: this->data.as_group().children) {
 			child->raiseToTop();
 		}
 		break;
@@ -226,21 +251,19 @@ void Hy3Node::raiseToTop() {
 }
 
 Hy3Node* Hy3Node::getFocusedNode(bool ignore_group_focus, bool stop_at_expanded) {
-	switch (this->data.type) {
+	switch (this->data.type()) {
 	case Hy3NodeType::Window: return this;
-	case Hy3NodeType::Group:
-		if (this->data.as_group.focused_child == nullptr
-		    || (!ignore_group_focus && this->data.as_group.group_focused)
-		    || (stop_at_expanded && this->data.as_group.expand_focused != ExpandFocusType::NotExpanded))
+	case Hy3NodeType::Group: {
+		auto& group = this->data.as_group();
+
+		if (group.focused_child == nullptr || (!ignore_group_focus && group.group_focused)
+		    || (stop_at_expanded && group.expand_focused != ExpandFocusType::NotExpanded))
 		{
 			return this;
 		} else {
-			return this->data.as_group.focused_child->getFocusedNode(
-			    ignore_group_focus,
-			    stop_at_expanded
-			);
+			return group.focused_child->getFocusedNode(ignore_group_focus, stop_at_expanded);
+		}
 	}
-	default: return nullptr;
 	}
 }
 
@@ -248,9 +271,8 @@ bool Hy3Node::isIndirectlyFocused() {
 	Hy3Node* node = this;
 
 	while (node->parent != nullptr) {
-		if (!node->parent->data.as_group.group_focused
-		    && node->parent->data.as_group.focused_child != node)
-			return false;
+		auto& group = node->parent->data.as_group();
+		if (!group.group_focused && group.focused_child != node) return false;
 		node = node->parent;
 	}
 
@@ -262,7 +284,7 @@ Hy3Node& Hy3Node::getExpandActor() {
 	Hy3Node* node = this;
 
 	while (node->parent != nullptr
-	       && node->parent->data.as_group.expand_focused != ExpandFocusType::NotExpanded)
+	       && node->parent->data.as_group().expand_focused != ExpandFocusType::NotExpanded)
 		node = node->parent;
 
 	return *node;
@@ -289,17 +311,18 @@ void Hy3Node::recalcSizePosRecursive(bool no_animation) {
 	);
 	// clang-format on
 
-	if (this->data.type == Hy3NodeType::Window && this->data.as_window->m_bIsFullscreen) {
+	if (this->data.is_window() && this->data.as_window()->m_bIsFullscreen) {
+		auto window = this->data.as_window();
 		auto* monitor = g_pCompositor->getMonitorFromID(this->workspace->m_iMonitorID);
 
 		if (this->workspace->m_efFullscreenMode == FULLSCREEN_FULL) {
-			this->data.as_window->m_vRealPosition = monitor->vecPosition;
-			this->data.as_window->m_vRealSize = monitor->vecSize;
+			window->m_vRealPosition = monitor->vecPosition;
+			window->m_vRealSize = monitor->vecSize;
 			return;
 		}
 
 		Hy3Node fake_node = {
-		    .data = this->data.as_window,
+		    .data = window,
 		    .position = monitor->vecPosition + monitor->vecReservedTopLeft,
 		    .size = monitor->vecSize - monitor->vecReservedTopLeft - monitor->vecReservedBottomRight,
 		    .gap_topleft_offset = gap_topleft_offset,
@@ -321,16 +344,16 @@ void Hy3Node::recalcSizePosRecursive(bool no_animation) {
 
 	double tab_height_offset = *tab_bar_height + *tab_bar_padding;
 
-	if (this->data.type == Hy3NodeType::Window) {
-		this->data.as_window->setHidden(this->hidden);
+	if (this->data.is_window()) {
+		this->data.as_window()->setHidden(this->hidden);
 		this->layout->applyNodeDataToWindow(this, no_animation);
 		return;
 	}
 
-	auto* group = &this->data.as_group;
+	auto& group = this->data.as_group();
 
 	double constraint;
-	switch (group->layout) {
+	switch (group.layout) {
 	case Hy3GroupLayout::SplitH:
 		constraint = tsize.x - gap_topleft_offset.x - gap_bottomright_offset.x;
 		break;
@@ -340,34 +363,34 @@ void Hy3Node::recalcSizePosRecursive(bool no_animation) {
 	case Hy3GroupLayout::Tabbed: break;
 	}
 
-	auto expand_focused = group->expand_focused != ExpandFocusType::NotExpanded;
+	auto expand_focused = group.expand_focused != ExpandFocusType::NotExpanded;
 	bool directly_contains_expanded =
 	    expand_focused
-	    && (group->focused_child->data.type == Hy3NodeType::Window
-	        || group->focused_child->data.as_group.expand_focused == ExpandFocusType::NotExpanded);
+	    && (group.focused_child->data.is_window()
+	        || group.focused_child->data.as_group().expand_focused == ExpandFocusType::NotExpanded);
 
-	auto child_count = group->children.size();
+	auto child_count = group.children.size();
 	double ratio_mul =
-	    group->layout != Hy3GroupLayout::Tabbed ? child_count <= 0 ? 0 : constraint / child_count : 0;
+	    group.layout != Hy3GroupLayout::Tabbed ? child_count <= 0 ? 0 : constraint / child_count : 0;
 
 	double offset = 0;
 
-	if (group->layout == Hy3GroupLayout::Tabbed && group->focused_child != nullptr
-	    && !group->focused_child->hidden)
+	if (group.layout == Hy3GroupLayout::Tabbed && group.focused_child != nullptr
+	    && !group.focused_child->hidden)
 	{
-		group->focused_child->setHidden(false);
+		group.focused_child->setHidden(false);
 
 		auto box = CBox {tpos.x, tpos.y, tsize.x, tsize.y};
 		g_pHyprRenderer->damageBox(&box);
 	}
 
-	if (group->expand_focused == ExpandFocusType::Latch) {
-		auto* expanded_node = group->focused_child;
+	if (group.expand_focused == ExpandFocusType::Latch) {
+		auto* expanded_node = group.focused_child;
 
-		while (expanded_node != nullptr && expanded_node->data.type == Hy3NodeType::Group
-		       && expanded_node->data.as_group.expand_focused != ExpandFocusType::NotExpanded)
+		while (expanded_node != nullptr && expanded_node->data.is_group()
+		       && expanded_node->data.as_group().expand_focused != ExpandFocusType::NotExpanded)
 		{
-			expanded_node = expanded_node->data.as_group.focused_child;
+			expanded_node = expanded_node->data.as_group().focused_child;
 		}
 
 		if (expanded_node == nullptr) {
@@ -390,9 +413,9 @@ void Hy3Node::recalcSizePosRecursive(bool no_animation) {
 		expanded_node->recalcSizePosRecursive(no_animation);
 	}
 
-	for (auto* child: group->children) {
-		if (directly_contains_expanded && child == group->focused_child) {
-			switch (group->layout) {
+	for (auto* child: group.children) {
+		if (directly_contains_expanded && child == group.focused_child) {
+			switch (group.layout) {
 			case Hy3GroupLayout::SplitH: offset += child->size_ratio * ratio_mul; break;
 			case Hy3GroupLayout::SplitV: offset += child->size_ratio * ratio_mul; break;
 			case Hy3GroupLayout::Tabbed: break;
@@ -401,7 +424,7 @@ void Hy3Node::recalcSizePosRecursive(bool no_animation) {
 			continue;
 		}
 
-		switch (group->layout) {
+		switch (group.layout) {
 		case Hy3GroupLayout::SplitH:
 			child->position.x = tpos.x + offset;
 			child->size.x = child->size_ratio * ratio_mul;
@@ -410,17 +433,17 @@ void Hy3Node::recalcSizePosRecursive(bool no_animation) {
 			child->size.y = tsize.y;
 			child->hidden = this->hidden || expand_focused;
 
-			if (group->children.size() == 1) {
+			if (group.children.size() == 1) {
 				child->gap_topleft_offset = gap_topleft_offset;
 				child->gap_bottomright_offset = gap_bottomright_offset;
 				child->size.x = tsize.x;
 				if (this->parent != nullptr) child->gap_bottomright_offset.x += *group_inset;
-			} else if (child == group->children.front()) {
+			} else if (child == group.children.front()) {
 				child->gap_topleft_offset = gap_topleft_offset;
 				child->gap_bottomright_offset = Vector2D(0, gap_bottomright_offset.y);
 				child->size.x += gap_topleft_offset.x;
 				offset += gap_topleft_offset.x;
-			} else if (child == group->children.back()) {
+			} else if (child == group.children.back()) {
 				child->gap_topleft_offset = Vector2D(0, gap_topleft_offset.y);
 				child->gap_bottomright_offset = gap_bottomright_offset;
 				child->size.x += gap_bottomright_offset.x;
@@ -439,17 +462,17 @@ void Hy3Node::recalcSizePosRecursive(bool no_animation) {
 			child->size.x = tsize.x;
 			child->hidden = this->hidden || expand_focused;
 
-			if (group->children.size() == 1) {
+			if (group.children.size() == 1) {
 				child->gap_topleft_offset = gap_topleft_offset;
 				child->gap_bottomright_offset = gap_bottomright_offset;
 				child->size.y = tsize.y;
 				if (this->parent != nullptr) child->gap_bottomright_offset.y += *group_inset;
-			} else if (child == group->children.front()) {
+			} else if (child == group.children.front()) {
 				child->gap_topleft_offset = gap_topleft_offset;
 				child->gap_bottomright_offset = Vector2D(gap_bottomright_offset.x, 0);
 				child->size.y += gap_topleft_offset.y;
 				offset += gap_topleft_offset.y;
-			} else if (child == group->children.back()) {
+			} else if (child == group.children.back()) {
 				child->gap_topleft_offset = Vector2D(gap_topleft_offset.x, 0);
 				child->gap_bottomright_offset = gap_bottomright_offset;
 				child->size.y += gap_bottomright_offset.y;
@@ -463,7 +486,7 @@ void Hy3Node::recalcSizePosRecursive(bool no_animation) {
 		case Hy3GroupLayout::Tabbed:
 			child->position = tpos;
 			child->size = tsize;
-			child->hidden = this->hidden || expand_focused || group->focused_child != child;
+			child->hidden = this->hidden || expand_focused || group.focused_child != child;
 
 			child->gap_topleft_offset =
 			    Vector2D(gap_topleft_offset.x, gap_topleft_offset.y + tab_height_offset);
@@ -478,18 +501,18 @@ void Hy3Node::recalcSizePosRecursive(bool no_animation) {
 }
 
 struct FindTopWindowInNodeResult {
-	CWindow* window = nullptr;
+	PHLWINDOW window = nullptr;
 	size_t index = 0;
 };
 
 void findTopWindowInNode(Hy3Node& node, FindTopWindowInNodeResult& result) {
-	switch (node.data.type) {
+	switch (node.data.type()) {
 	case Hy3NodeType::Window: {
-		auto* window = node.data.as_window;
+		auto window = node.data.as_window();
 		auto& windows = g_pCompositor->m_vWindows;
 
 		for (; result.index < windows.size(); result.index++) {
-			if (&*windows[result.index] == window) {
+			if (windows[result.index] == window) {
 				result.window = window;
 				break;
 			}
@@ -497,7 +520,7 @@ void findTopWindowInNode(Hy3Node& node, FindTopWindowInNodeResult& result) {
 
 	} break;
 	case Hy3NodeType::Group: {
-		auto& group = node.data.as_group;
+		auto& group = node.data.as_group();
 
 		if (group.layout == Hy3GroupLayout::Tabbed) {
 			if (group.focused_child != nullptr) findTopWindowInNode(*group.focused_child, result);
@@ -511,8 +534,8 @@ void findTopWindowInNode(Hy3Node& node, FindTopWindowInNodeResult& result) {
 }
 
 void Hy3Node::updateTabBar(bool no_animation) {
-	if (this->data.type == Hy3NodeType::Group) {
-		auto& group = this->data.as_group;
+	if (this->data.type() == Hy3NodeType::Group) {
+		auto& group = this->data.as_group();
 
 		if (group.layout == Hy3GroupLayout::Tabbed) {
 			if (group.tab_bar == nullptr) group.tab_bar = &this->layout->tab_groups.emplace_back(*this);
@@ -539,13 +562,12 @@ void Hy3Node::updateTabBarRecursive() {
 }
 
 void Hy3Node::updateDecos() {
-	switch (this->data.type) {
+	switch (this->data.type()) {
 	case Hy3NodeType::Window:
-		if (this->data.as_window->m_bIsMapped)
-			g_pCompositor->updateWindowAnimatedDecorationValues(this->data.as_window);
+		g_pCompositor->updateWindowAnimatedDecorationValues(this->data.as_window());
 		break;
 	case Hy3NodeType::Group:
-		for (auto* child: this->data.as_group.children) {
+		for (auto* child: this->data.as_group().children) {
 			child->updateDecos();
 		}
 
@@ -554,21 +576,22 @@ void Hy3Node::updateDecos() {
 }
 
 std::string Hy3Node::getTitle() {
-	switch (this->data.type) {
-	case Hy3NodeType::Window: return this->data.as_window->m_szTitle;
+	switch (this->data.type()) {
+	case Hy3NodeType::Window: return this->data.as_window()->m_szTitle;
 	case Hy3NodeType::Group:
 		std::string title;
+		auto& group = this->data.as_group();
 
-		switch (this->data.as_group.layout) {
+		switch (group.layout) {
 		case Hy3GroupLayout::SplitH: title = "[H] "; break;
 		case Hy3GroupLayout::SplitV: title = "[V] "; break;
 		case Hy3GroupLayout::Tabbed: title = "[T] "; break;
 		}
 
-		if (this->data.as_group.focused_child == nullptr) {
+		if (group.focused_child == nullptr) {
 			title += "Group";
 		} else {
-			title += this->data.as_group.focused_child->getTitle();
+			title += group.focused_child->getTitle();
 		}
 
 		return title;
@@ -578,33 +601,31 @@ std::string Hy3Node::getTitle() {
 }
 
 bool Hy3Node::isUrgent() {
-	switch (this->data.type) {
-	case Hy3NodeType::Window: return this->data.as_window->m_bIsUrgent;
+	switch (this->data.type()) {
+	case Hy3NodeType::Window: return this->data.as_window()->m_bIsUrgent;
 	case Hy3NodeType::Group:
-		for (auto* child: this->data.as_group.children) {
+		for (auto* child: this->data.as_group().children) {
 			if (child->isUrgent()) return true;
 		}
 
 		return false;
-	default: return false;
 	}
 }
 
 void Hy3Node::setHidden(bool hidden) {
 	this->hidden = hidden;
 
-	if (this->data.type == Hy3NodeType::Group) {
-		for (auto* child: this->data.as_group.children) {
+	if (this->data.is_group()) {
+		for (auto* child: this->data.as_group().children) {
 			child->setHidden(hidden);
 		}
 	}
 }
 
 Hy3Node* Hy3Node::findNodeForTabGroup(Hy3TabGroup& tab_group) {
-	if (this->data.type == Hy3NodeType::Group) {
+	if (this->data.is_group()) {
 		if (this->hidden) return nullptr;
-
-		auto& group = this->data.as_group;
+		auto& group = this->data.as_group();
 
 		if (group.layout == Hy3GroupLayout::Tabbed && group.tab_bar == &tab_group) {
 			return this;
@@ -619,11 +640,11 @@ Hy3Node* Hy3Node::findNodeForTabGroup(Hy3TabGroup& tab_group) {
 	return nullptr;
 }
 
-void Hy3Node::appendAllWindows(std::vector<CWindow*>& list) {
-	switch (this->data.type) {
-	case Hy3NodeType::Window: list.push_back(this->data.as_window); break;
+void Hy3Node::appendAllWindows(std::vector<PHLWINDOW>& list) {
+	switch (this->data.type()) {
+	case Hy3NodeType::Window: list.push_back(this->data.as_window()); break;
 	case Hy3NodeType::Group:
-		for (auto* child: this->data.as_group.children) {
+		for (auto* child: this->data.as_group().children) {
 			child->appendAllWindows(list);
 		}
 		break;
@@ -633,12 +654,12 @@ void Hy3Node::appendAllWindows(std::vector<CWindow*>& list) {
 std::string Hy3Node::debugNode() {
 	std::stringstream buf;
 	std::string addr = "0x" + std::to_string((size_t) this);
-	switch (this->data.type) {
+	switch (this->data.type()) {
 	case Hy3NodeType::Window:
 		buf << "window(";
 		buf << std::hex << this;
 		buf << ") [hypr ";
-		buf << this->data.as_window;
+		buf << this->data.as_window();
 		buf << "] size ratio: ";
 		buf << this->size_ratio;
 		break;
@@ -647,7 +668,8 @@ std::string Hy3Node::debugNode() {
 		buf << std::hex << this;
 		buf << ") [";
 
-		switch (this->data.as_group.layout) {
+		auto& group = this->data.as_group();
+		switch (group.layout) {
 		case Hy3GroupLayout::SplitH: buf << "splith"; break;
 		case Hy3GroupLayout::SplitV: buf << "splitv"; break;
 		case Hy3GroupLayout::Tabbed: buf << "tabs"; break;
@@ -656,19 +678,19 @@ std::string Hy3Node::debugNode() {
 		buf << "] size ratio: ";
 		buf << this->size_ratio;
 
-		if (this->data.as_group.expand_focused != ExpandFocusType::NotExpanded) {
+		if (group.expand_focused != ExpandFocusType::NotExpanded) {
 			buf << ", has-expanded";
 		}
 
-		if (this->data.as_group.ephemeral) {
+		if (group.ephemeral) {
 			buf << ", ephemeral";
 		}
 
-		if (this->data.as_group.containment) {
+		if (group.containment) {
 			buf << ", containment";
 		}
 
-		for (auto* child: this->data.as_group.children) {
+		for (auto* child: group.children) {
 			buf << "\n|-";
 			if (child == nullptr) {
 				buf << "nullptr";
@@ -694,8 +716,8 @@ Hy3Node* Hy3Node::removeFromParentRecursive(Hy3Node** expand_actor) {
 
 	if (this->parent != nullptr) {
 		auto& actor = this->getExpandActor();
-		if (actor.data.type == Hy3NodeType::Group) {
-			actor.data.as_group.collapseExpansions();
+		if (actor.data.is_group()) {
+			actor.data.as_group().collapseExpansions();
 			if (expand_actor != nullptr) *expand_actor = &actor;
 		}
 	}
@@ -708,7 +730,7 @@ Hy3Node* Hy3Node::removeFromParentRecursive(Hy3Node** expand_actor) {
 
 		auto* child = parent;
 		parent = parent->parent;
-		auto& group = parent->data.as_group;
+		auto& group = parent->data.as_group();
 
 		if (group.children.size() > 2) {
 			auto iter = std::find(group.children.begin(), group.children.end(), child);
@@ -778,10 +800,11 @@ Hy3Node* Hy3Node::intoGroup(Hy3GroupLayout layout, GroupEphemeralityOption ephem
 	swapData(*this, *node);
 
 	this->data = layout;
-	this->data.as_group.children.push_back(node);
-	this->data.as_group.group_focused = false;
-	this->data.as_group.focused_child = node;
-	this->data.as_group.ephemeral = ephemeral == GroupEphemeralityOption::Ephemeral
+	auto& group = this->data.as_group();
+	group.children.push_back(node);
+	group.group_focused = false;
+	group.focused_child = node;
+	group.ephemeral = ephemeral == GroupEphemeralityOption::Ephemeral
 	               || ephemeral == GroupEphemeralityOption::ForceEphemeral;
 	this->recalcSizePosRecursive();
 	this->updateTabBarRecursive();
@@ -790,15 +813,14 @@ Hy3Node* Hy3Node::intoGroup(Hy3GroupLayout layout, GroupEphemeralityOption ephem
 }
 
 bool Hy3Node::swallowGroups(Hy3Node* into) {
-	if (into == nullptr || into->data.type != Hy3NodeType::Group
-	    || into->data.as_group.children.size() != 1)
+	if (into == nullptr || into->data.is_window() || into->data.as_group().children.size() != 1)
 		return false;
 
-	auto* child = into->data.as_group.children.front();
+	auto* child = into->data.as_group().children.front();
 
 	// a lot of segfaulting happens once the assumption that the root node is a
 	// group is wrong.
-	if (into->parent == nullptr && child->data.type != Hy3NodeType::Group) return false;
+	if (into->parent == nullptr && child->data.is_window()) return false;
 
 	hy3_log(TRACE, "swallowing node {:x} into node {:x}", (uintptr_t) child, (uintptr_t) into);
 
@@ -819,7 +841,7 @@ Hy3Node* getOuterChild(Hy3GroupData& group, ShiftDirection direction) {
 }
 
 Hy3Node* Hy3Node::getImmediateSibling(ShiftDirection direction) {
-	const auto& group = this->parent->data.as_group;
+	const auto& group = this->parent->data.as_group();
 
 	auto iter = std::find(group.children.begin(), group.children.end(), this);
 
@@ -864,7 +886,7 @@ Hy3Node* Hy3Node::findNeighbor(ShiftDirection direction) {
 	Hy3Node* sibling = nullptr;
 
 	while (sibling == nullptr && current_node->parent != nullptr) {
-		auto& parent_group = current_node->parent->data.as_group;
+		auto& parent_group = current_node->parent->data.as_group();
 
 		if (parent_group.layout != Hy3GroupLayout::Tabbed
 		    && getAxis(parent_group.layout) == getAxis(direction))
@@ -895,7 +917,7 @@ int directionToIteratorIncrement(ShiftDirection direction) {
 
 void Hy3Node::resize(ShiftDirection direction, double delta, bool no_animation) {
 	auto& parent_node = this->parent;
-	auto& containing_group = parent_node->data.as_group;
+	auto& containing_group = parent_node->data.as_group();
 
 	if (containing_group.layout != Hy3GroupLayout::Tabbed
 	    && getAxis(direction) == getAxis(containing_group.layout))
@@ -936,14 +958,14 @@ void Hy3Node::swapData(Hy3Node& a, Hy3Node& b) {
 	a.data = std::move(b.data);
 	b.data = std::move(aData);
 
-	if (a.data.type == Hy3NodeType::Group) {
-		for (auto child: a.data.as_group.children) {
+	if (a.data.is_group()) {
+		for (auto child: a.data.as_group().children) {
 			child->parent = &a;
 		}
 	}
 
-	if (b.data.type == Hy3NodeType::Group) {
-		for (auto child: b.data.as_group.children) {
+	if (b.data.is_group()) {
+		for (auto child: b.data.as_group().children) {
 			child->parent = &b;
 		}
 	}

src/Hy3Node.hpp

@@ -4,8 +4,9 @@ struct Hy3Node;
 struct Hy3GroupData;
 enum class Hy3GroupLayout;
 
-#include <list>
+#include <variant>
 
+#include <hyprland/src/defines.hpp>
 #include <hyprland/src/desktop/Window.hpp>
 
 #include "Hy3Layout.hpp"
@@ -47,7 +48,6 @@ struct Hy3GroupData {
 	void setLayout(Hy3GroupLayout layout);
 	void setEphemeral(GroupEphemeralityOption ephemeral);
 
-private:
 	Hy3GroupData(Hy3GroupData&&);
 	Hy3GroupData(const Hy3GroupData&) = delete;
 
@@ -56,26 +56,28 @@ private:
 
 class Hy3NodeData {
 public:
-	Hy3NodeType type;
-	union {
-		Hy3GroupData as_group;
-		CWindow* as_window;
-	};
-
-	Hy3NodeData();
-	Hy3NodeData(CWindow* window);
+	Hy3NodeData() = default;
+	Hy3NodeData(Hy3GroupData);
+	Hy3NodeData(PHLWINDOW window);
 	Hy3NodeData(Hy3GroupLayout layout);
-	~Hy3NodeData();
+	Hy3NodeData(Hy3NodeData&&);
+	~Hy3NodeData() = default;
 
-	Hy3NodeData& operator=(CWindow*);
+	Hy3NodeData& operator=(PHLWINDOW);
 	Hy3NodeData& operator=(Hy3GroupLayout);
+	Hy3NodeData& operator=(Hy3NodeData&&);
 
 	bool operator==(const Hy3NodeData&) const;
 
-	// private: - I give up, C++ wins
-	Hy3NodeData(Hy3GroupData);
-	Hy3NodeData(Hy3NodeData&&);
-	Hy3NodeData& operator=(Hy3NodeData&&);
+	bool valid() const;
+	Hy3NodeType type() const;
+	bool is_window() const;
+	bool is_group() const;
+	Hy3GroupData& as_group();
+	PHLWINDOW as_window();
+
+private:
+	std::variant<PHLWINDOWREF, Hy3GroupData> data;
 };
 
 struct Hy3Node {
@@ -95,7 +97,7 @@ struct Hy3Node {
 
 	void focus();
 	void focusWindow();
-	CWindow* bringToTop();
+	PHLWINDOW bringToTop();
 	void markFocused();
 	void raiseToTop();
 	Hy3Node* getFocusedNode(bool ignore_group_focus = false, bool stop_at_expanded = false);
@@ -115,7 +117,7 @@ struct Hy3Node {
 	void setHidden(bool);
 
 	Hy3Node* findNodeForTabGroup(Hy3TabGroup&);
-	void appendAllWindows(std::vector<CWindow*>&);
+	void appendAllWindows(std::vector<PHLWINDOW>&);
 	std::string debugNode();
 
 	// Remove this node from its parent, deleting the parent if it was

src/SelectionHook.cpp

@@ -6,15 +6,15 @@
 namespace selection_hook {
 inline CFunctionHook* g_LastSelectionHook = nullptr;
 
-void hook_updateDecos(void* thisptr, CWindow* window) {
+void hook_updateDecos(void* thisptr, PHLWINDOW window) {
 	bool explicitly_selected = g_Hy3Layout->shouldRenderSelected(window);
 
-	auto* lastWindow = g_pCompositor->m_pLastWindow;
+	auto lastWindow = g_pCompositor->m_pLastWindow;
 	if (explicitly_selected) {
 		g_pCompositor->m_pLastWindow = window;
 	}
 
-	((void (*)(void*, CWindow*)) g_LastSelectionHook->m_pOriginal)(thisptr, window);
+	((void (*)(void*, PHLWINDOW)) g_LastSelectionHook->m_pOriginal)(thisptr, window);
 
 	if (explicitly_selected) {
 		g_pCompositor->m_pLastWindow = lastWindow;

src/TabGroup.cpp

@@ -2,6 +2,8 @@
 
 #include <cairo/cairo.h>
 #include <hyprland/src/Compositor.hpp>
+#include <hyprland/src/desktop/DesktopTypes.hpp>
+#include <hyprland/src/desktop/Workspace.hpp>
 #include <hyprland/src/helpers/Box.hpp>
 #include <hyprland/src/helpers/Color.hpp>
 #include <hyprland/src/render/OpenGL.hpp>
@@ -328,7 +330,7 @@ exitloop:
 
 		// set stats from node data
 		auto* parent = (*node)->parent;
-		auto& parent_group = parent->data.as_group;
+		auto& parent_group = parent->data.as_group();
 
 		entry->setFocused(
 		    parent_group.focused_child == *node
@@ -433,11 +435,11 @@ void Hy3TabGroup::updateWithGroup(Hy3Node& node, bool warp) {
 		if (warp) this->size.warp();
 	}
 
-	this->bar.updateNodeList(node.data.as_group.children);
+	this->bar.updateNodeList(node.data.as_group().children);
 	this->bar.updateAnimations(warp);
 
-	if (node.data.as_group.focused_child != nullptr) {
-		this->updateStencilWindows(*node.data.as_group.focused_child);
+	if (node.data.as_group().focused_child != nullptr) {
+		this->updateStencilWindows(*node.data.as_group().focused_child);
 	}
 }
 
@@ -539,8 +541,9 @@ void Hy3TabGroup::renderTabBar() {
 
 		glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
 
-		for (auto* window: this->stencil_windows) {
-			if (!g_pCompositor->windowExists(window)) continue;
+		for (auto windowref: this->stencil_windows) {
+			if (!valid(windowref)) continue;
+			auto window = windowref.lock();
 
 			auto wpos = window->m_vRealPosition.value() - monitor->vecPosition;
 			auto wsize = window->m_vRealSize.value();
@@ -603,11 +606,11 @@ void Hy3TabGroup::renderTabBar() {
 	}
 }
 
-void findOverlappingWindows(Hy3Node& node, float height, std::vector<CWindow*>& windows) {
-	switch (node.data.type) {
-	case Hy3NodeType::Window: windows.push_back(node.data.as_window); break;
+void findOverlappingWindows(Hy3Node& node, float height, std::vector<PHLWINDOWREF>& windows) {
+	switch (node.data.type()) {
+	case Hy3NodeType::Window: windows.push_back(node.data.as_window()); break;
 	case Hy3NodeType::Group:
-		auto& group = node.data.as_group;
+		auto& group = node.data.as_group();
 
 		switch (group.layout) {
 		case Hy3GroupLayout::SplitH:

src/TabGroup.hpp

@@ -85,7 +85,7 @@ private:
 
 class Hy3TabGroup {
 public:
-	CWindow* target_window = nullptr;
+	PHLWINDOW target_window = nullptr;
 	PHLWORKSPACE workspace = nullptr;
 	bool hidden = false;
 	Hy3TabBar bar;
@@ -102,7 +102,7 @@ public:
 	void renderTabBar();
 
 private:
-	std::vector<CWindow*> stencil_windows;
+	std::vector<PHLWINDOWREF> stencil_windows;
 	Vector2D last_pos;
 	Vector2D last_size;