Initial work on tab groups

CMakeLists.txt

@@ -11,11 +11,12 @@ if(CMAKE_EXPORT_COMPILE_COMMANDS)
 endif()
 
 find_package(PkgConfig REQUIRED)
-pkg_check_modules(DEPS REQUIRED hyprland pixman-1 libdrm)
+pkg_check_modules(DEPS REQUIRED hyprland pixman-1 libdrm pango pangocairo)
 
 add_library(hy3 SHARED
 	src/main.cpp
 	src/Hy3Layout.cpp
+	src/TabGroup.cpp
 	src/SelectionHook.cpp
 )
 

flake.lock

@@ -8,11 +8,11 @@
         "xdph": "xdph"
       },
       "locked": {
-        "lastModified": 1682603803,
+        "lastModified": 1684167111,
-        "narHash": "sha256-NY9nVAdB7UyInu2vPx/DIUVNZ83t4RdP16QY9DTIn4s=",
+        "narHash": "sha256-0JKyr8WOpcXJP5XaLnUSI7e1d7N5Rcpyf72+N4ZEtjo=",
         "owner": "hyprwm",
         "repo": "Hyprland",
-        "rev": "f23455e592bca14e0abd9249de467cc71cd2850e",
+        "rev": "5b84b0fb445bc4485510bba516c84141aaeafd04",
         "type": "github"
       },
       "original": {
@@ -44,11 +44,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1682453498,
+        "lastModified": 1683014792,
-        "narHash": "sha256-WoWiAd7KZt5Eh6n+qojcivaVpnXKqBsVgpixpV2L9CE=",
+        "narHash": "sha256-6Va9iVtmmsw4raBc3QKvQT2KT/NGRWlvUlJj46zN8B8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c8018361fa1d1650ee8d4b96294783cf564e8a7f",
+        "rev": "1a411f23ba299db155a5b45d5e145b85a7aafc42",
         "type": "github"
       },
       "original": {

flake.nix

@@ -15,8 +15,10 @@
 
         nativeBuildInputs = with pkgs; [ cmake pkg-config ];
 
-        buildInputs = [
+        buildInputs = with pkgs; [
           hyprland.packages.${system}.hyprland.dev
+          pango
+          cairo
         ] ++ hyprland.packages.${system}.hyprland.buildInputs;
 
         # no noticeable impact on performance and greatly assists debugging

src/Hy3Layout.cpp

@@ -41,18 +41,6 @@ Hy3NodeData::~Hy3NodeData() {
 	}
 }
 
-Hy3NodeData::Hy3NodeData(const Hy3NodeData& from): type(from.type) {
-	Debug::log(LOG, "Copy CTor type matches? %d is group? %d", this->type == from.type, this->type == Hy3NodeData::Group);
-	switch (from.type) {
-	case Hy3NodeData::Window:
-		this->as_window = from.as_window;
-		break;
-	case Hy3NodeData::Group:
-		new(&this->as_group) Hy3GroupData(from.as_group);
-		break;
-	}
-}
-
 Hy3NodeData::Hy3NodeData(Hy3NodeData&& from): type(from.type) {
 	Debug::log(LOG, "Move CTor type matches? %d is group? %d", this->type == from.type, this->type == Hy3NodeData::Group);
 	switch (from.type) {
@@ -65,7 +53,7 @@ Hy3NodeData::Hy3NodeData(Hy3NodeData&& from): type(from.type) {
 	}
 }
 
-Hy3NodeData& Hy3NodeData::operator=(const Hy3NodeData& from) {
+Hy3NodeData& Hy3NodeData::operator=(Hy3NodeData&& from) {
 	Debug::log(LOG, "operator= type matches? %d is group? %d", this->type == from.type, this->type == Hy3NodeData::Group);
 	if (this->type == Hy3NodeData::Group) {
 		this->as_group.~Hy3GroupData();
@@ -78,7 +66,7 @@ Hy3NodeData& Hy3NodeData::operator=(const Hy3NodeData& from) {
 		this->as_window = from.as_window;
 		break;
 	case Hy3NodeData::Group:
-		new(&this->as_group) Hy3GroupData(from.as_group);
+		new(&this->as_group) Hy3GroupData(std::move(from.as_group));
 		break;
 	}
 
@@ -121,36 +109,44 @@ void Hy3Node::recalcSizePosRecursive(bool force) {
 			errorNotif();
 		}
 
-		double distortOut;
+		double distort_out;
-		double distortIn;
+		double distort_in;
+		double tab_height_offset;
 
-		const auto* gaps_in     = &g_pConfigManager->getConfigValuePtr("general:gaps_in")->intValue;
+		static const auto* gaps_in = &HyprlandAPI::getConfigValue(PHANDLE, "general:gaps_in")->intValue;
-		const auto* gaps_out    = &g_pConfigManager->getConfigValuePtr("general:gaps_out")->intValue;
+		static const auto* gaps_out = &HyprlandAPI::getConfigValue(PHANDLE, "general:gaps_out")->intValue;
+		static const auto* tab_bar_height = &HyprlandAPI::getConfigValue(PHANDLE, "plugin:hy3:tabs:bar_height")->intValue;
+
+		tab_height_offset = *gaps_in * 2 + *tab_bar_height;
 
 		if (gaps_in > gaps_out) {
-			distortOut = *gaps_out - 1.0;
+			distort_out = *gaps_out - 1.0;
 		} else {
-			distortOut = *gaps_in - 1.0;
+			distort_out = *gaps_in - 1.0;
 		}
 
-		if (distortOut < 0) distortOut = 0.0;
+		if (distort_out < 0) distort_out = 0.0;
 
-		distortIn = *gaps_in * 2;
+		distort_in = *gaps_in * 2;
 
 		switch (group->layout) {
 		case Hy3GroupLayout::SplitH:
-			child->position.x = this->position.x - distortOut;
+			child->position.x = this->position.x - distort_out;
-			child->size.x = this->size.x - distortIn;
+			child->size.x = this->size.x - distort_in;
 			child->position.y = this->position.y;
 			child->size.y = this->size.y;
 			break;
 		case Hy3GroupLayout::SplitV:
-			child->position.y = this->position.y - distortOut;
+			child->position.y = this->position.y - distort_out;
-			child->size.y = this->size.y - distortIn;
+			child->size.y = this->size.y - distort_in;
 			child->position.x = this->position.x;
 			child->size.x = this->size.x;
+			break;
 		case Hy3GroupLayout::Tabbed:
-			// TODO
+			child->position.y = this->position.y + tab_height_offset;
+			child->size.y = this->size.y - tab_height_offset;
+			child->position.x = this->position.x;
+			child->size.x = this->size.x;
 			break;
 		}
 
@@ -182,6 +178,7 @@ void Hy3Node::recalcSizePosRecursive(bool force) {
 			offset += child->size.x;
 			child->position.y = this->position.y;
 			child->size.y = this->size.y;
+			//child->setHidden(false);
 			break;
 		case Hy3GroupLayout::SplitV:
 			child->position.y = this->position.y + offset;
@@ -189,11 +186,14 @@ void Hy3Node::recalcSizePosRecursive(bool force) {
 			offset += child->size.y;
 			child->position.x = this->position.x;
 			child->size.x = this->size.x;
+			//child->setHidden(false);
 			break;
 		case Hy3GroupLayout::Tabbed:
-			// TODO: tab bars
+			child->position.y = this->position.y + 20;
-			child->position = this->position;
+			child->size.y = this->size.y - 20;
-			child->size = this->size;
+			child->position.x = this->position.x;
+			child->size.x = this->size.x;
+			//child->setHidden(group->lastFocusedChild != child);
 			break;
 		}
 
@@ -201,6 +201,62 @@ void Hy3Node::recalcSizePosRecursive(bool force) {
 	}
 }
 
+void Hy3Node::setHidden(bool hidden) {
+	switch (this->data.type) {
+	case Hy3NodeData::Window:
+		this->data.as_window->setHidden(hidden);
+		break;
+	case Hy3NodeData::Group:
+		for (auto* child: this->data.as_group.children) {
+			child->setHidden(hidden);
+		}
+	}
+}
+
+bool Hy3Node::isUrgent() {
+	switch (this->data.type) {
+	case Hy3NodeData::Window:
+		return this->data.as_window->m_bIsUrgent;
+	case Hy3NodeData::Group:
+		for (auto* child: this->data.as_group.children) {
+			if (child->isUrgent()) return true;
+		}
+
+		return false;
+	}
+}
+
+std::string Hy3Node::getTitle() {
+	switch (this->data.type) {
+	case Hy3NodeData::Window:
+		return this->data.as_window->m_szTitle;
+	case Hy3NodeData::Group:
+		std::string title;
+
+		switch (this->data.as_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.lastFocusedChild == nullptr) {
+			title += "Group";
+		} else {
+			title += this->data.as_group.lastFocusedChild->getTitle();
+		}
+
+		return title;
+	}
+
+	return "";
+}
+
 void Hy3Node::markFocused() {
 	Hy3Node* node = this;
 
@@ -384,8 +440,8 @@ bool Hy3GroupData::hasChild(Hy3Node* node) {
 
 void Hy3Node::swapData(Hy3Node& a, Hy3Node& b) {
 	Hy3NodeData aData = std::move(a.data);
-	a.data = b.data;
+	a.data = std::move(b.data);
-	b.data = aData;
+	b.data = std::move(aData);
 
 	if (a.data.type == Hy3NodeData::Group) {
 		for (auto child: a.data.as_group.children) {
@@ -687,6 +743,10 @@ void Hy3Layout::onWindowFocusChange(CWindow* window) {
 	auto* node = this->getNodeFromWindow(window);
 	if (node == nullptr) return;
 
+	if (node->parent != nullptr && node->parent->data.as_group.layout == Hy3GroupLayout::Tabbed) {
+		node->parent->recalcSizePosRecursive();
+	}
+
 	node->markFocused();
 }
 
@@ -1066,6 +1126,8 @@ void Hy3Layout::replaceWindowDataWith(CWindow* from, CWindow* to) {
 	this->applyNodeDataToWindow(node);
 }
 
+std::unique_ptr<HOOK_CALLBACK_FN> renderHookPtr = std::make_unique<HOOK_CALLBACK_FN>(Hy3Layout::renderHook);
+
 void Hy3Layout::onEnable() {
 	for (auto &window : g_pCompositor->m_vWindows) {
 		if (window->isHidden()
@@ -1077,10 +1139,12 @@ void Hy3Layout::onEnable() {
 		this->onWindowCreatedTiling(window.get());
 	}
 
+	HyprlandAPI::registerCallbackStatic(PHANDLE, "render", renderHookPtr.get());
 	selection_hook::enable();
 }
 
 void Hy3Layout::onDisable() {
+	HyprlandAPI::unregisterCallback(PHANDLE, renderHookPtr.get());
 	selection_hook::disable();
 	this->nodes.clear();
 }
@@ -1198,7 +1262,7 @@ Hy3Node* Hy3Layout::shiftOrGetFocus(Hy3Node& node, ShiftDirection direction, boo
 
 			// if we haven't gone up any levels and the group is in the same direction
 			// there's no reason to wrap the root group.
-			if (shiftMatchesLayout(group.layout, direction)) break;
+			if (group.layout != Hy3GroupLayout::Tabbed && shiftMatchesLayout(group.layout, direction)) break;
 
 			if (group.layout != Hy3GroupLayout::Tabbed
 				&& group.children.size() == 2
@@ -1413,3 +1477,48 @@ std::string Hy3Node::debugNode() {
 
 	return buf.str();
 }
+
+// Recursively render tabs on all tab groups.
+void renderTabsRecursive(Hy3Node& node);
+
+// Render tabs for the provided node, blindly assuming it is a tab group.
+void renderTabs(Hy3Node& node);
+
+void Hy3Layout::renderHook(void*, std::any data) {
+	auto render_stage = std::any_cast<eRenderStage>(data);
+	if (render_stage == RENDER_POST_WINDOWS) {
+		auto* monitor = g_pHyprOpenGL->m_RenderData.pMonitor;
+		auto workspace = monitor->activeWorkspace;
+		auto* root = g_Hy3Layout->getWorkspaceRootGroup(workspace);
+
+		if (root != nullptr) renderTabsRecursive(*root);
+	}
+}
+
+void renderTabsRecursive(Hy3Node& node) {
+	if (node.data.type == Hy3NodeData::Group) {
+		for (auto* child: node.data.as_group.children) {
+			if (node.data.as_group.layout != Hy3GroupLayout::Tabbed
+					|| node.data.as_group.lastFocusedChild == child)
+			{
+				renderTabsRecursive(*child);
+			}
+		}
+
+		if (node.data.as_group.layout == Hy3GroupLayout::Tabbed) {
+			renderTabs(node);
+		}
+	}
+}
+
+void renderTabs(Hy3Node& node) {
+	auto& group = node.data.as_group;
+
+	if (!group.tab_bar) {
+		group.tab_bar = std::unique_ptr<Hy3TabGroup>(new Hy3TabGroup(node));
+	} else {
+		group.tab_bar->updateWithGroup(node);
+	}
+
+	group.tab_bar->renderTabBar();
+}

src/Hy3Layout.hpp

@@ -1,5 +1,8 @@
 #pragma once
 
+struct Hy3Node;
+#include "TabGroup.hpp"
+
 #include <list>
 #include <hyprland/src/layout/IHyprLayout.hpp>
 
@@ -23,6 +26,7 @@ struct Hy3GroupData {
 	Hy3GroupLayout layout = Hy3GroupLayout::SplitH;
 	std::list<Hy3Node*> children;
 	Hy3Node* lastFocusedChild = nullptr;
+	std::unique_ptr<Hy3TabGroup> tab_bar;
 
 	bool hasChild(Hy3Node* child);
 
@@ -30,7 +34,6 @@ struct Hy3GroupData {
 
 private:
 	Hy3GroupData(Hy3GroupData&&) = default;
-	Hy3GroupData(const Hy3GroupData&) = default;
 
 	friend class Hy3NodeData;
 };
@@ -54,9 +57,8 @@ public:
 
 	//private: - I give up, C++ wins
 	Hy3NodeData(Hy3GroupData);
-	Hy3NodeData(const Hy3NodeData&);
 	Hy3NodeData(Hy3NodeData&&);
-	Hy3NodeData& operator=(const Hy3NodeData&);
+	Hy3NodeData& operator=(Hy3NodeData&&);
 };
 
 struct Hy3Node {
@@ -76,6 +78,9 @@ struct Hy3Node {
 	void raiseToTop();
 	Hy3Node* getFocusedNode();
 	void updateDecos();
+	void setHidden(bool hidden);
+	bool isUrgent();
+	std::string getTitle();
 
 	bool operator==(const Hy3Node&) const;
 
@@ -126,6 +131,8 @@ public:
 	Hy3Node* getWorkspaceRootGroup(const int&);
 	Hy3Node* getWorkspaceFocusedNode(const int&);
 
+	static void renderHook(void*, std::any);
+
 	std::list<Hy3Node> nodes;
 private:
 	struct {

src/TabGroup.cpp

@@ -0,0 +1,198 @@
+#include "globals.hpp"
+#include "TabGroup.hpp"
+#include "Hy3Layout.hpp"
+
+#include <hyprland/src/Compositor.hpp>
+#include <cairo/cairo.h>
+
+void Hy3TabBar::updateWithGroupEntries(Hy3Node& group_node) {
+	if (group_node.data.type != Hy3NodeData::Group) return;
+	auto& group = group_node.data.as_group;
+
+	auto entries_iter = this->entries.begin();
+	auto group_iter = group.children.begin();
+
+	auto* root_node = &group_node;
+	while (root_node->parent != nullptr) root_node = root_node->parent;
+	Hy3Node* focused_node = root_node->getFocusedNode();
+
+	while (entries_iter != this->entries.end()) {
+		if (group_iter == group.children.end()) {
+			needs_redraw = true;
+
+			while (entries_iter != this->entries.end()) {
+				entries_iter = this->entries.erase(entries_iter);
+			}
+
+			return;
+		};
+
+		auto& entry = *entries_iter;
+		auto& node = **group_iter;
+
+		std::string title = node.getTitle();
+		bool urgent = node.isUrgent();
+		bool focused = focused_node == &group_node
+		|| focused_node == &node
+			|| (node.data.type == Hy3NodeData::Group && node.data.as_group.hasChild(focused_node));
+
+		if (entry.urgent != urgent
+				|| entry.focused != focused
+				|| entry.window_title != title)
+			this->needs_redraw = true;
+
+		entry.window_title = std::move(title);
+		entry.urgent = urgent;
+		entry.focused = focused;
+
+		entries_iter = std::next(entries_iter);
+		group_iter = std::next(group_iter);
+	}
+
+	while (group_iter != group.children.end()) {
+		needs_redraw = true;
+
+		auto& node = **group_iter;
+
+		this->entries.push_back({
+			.window_title = node.getTitle(),
+			.urgent = node.isUrgent(),
+			.focused = focused_node == &group_node
+				|| focused_node == &node
+				|| (node.data.type == Hy3NodeData::Group && node.data.as_group.hasChild(focused_node)),
+		});
+
+		group_iter = std::next(group_iter);
+	}
+}
+
+void Hy3TabBar::setPos(Vector2D pos) {
+	if (pos == this->pos) return;
+	needs_redraw = true;
+	this->pos = pos;
+}
+
+void Hy3TabBar::setSize(Vector2D size) {
+	this->size = size;
+}
+
+void Hy3TabBar::prepareTexture() {
+	auto bar_width = this->size.x;
+	auto bar_height = this->size.y;
+
+	if (needs_redraw || this->texture.m_iTexID == 0) {
+		static const auto* rounding_setting = &HyprlandAPI::getConfigValue(PHANDLE, "plugin:hy3:tabs:rounding")->intValue;
+		auto rounding = *rounding_setting;
+
+		auto cairo_surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, this->size.x, this->size.y);
+		auto cairo = cairo_create(cairo_surface);
+
+		// clear pixmap
+		cairo_save(cairo);
+		cairo_set_operator(cairo, CAIRO_OPERATOR_CLEAR);
+		cairo_paint(cairo);
+		cairo_restore(cairo);
+
+		auto swidth = (double) bar_width / (double) this->entries.size();
+		size_t i = 0;
+
+		for (auto& entry: this->entries) {
+			auto width = swidth;
+			auto x = i * width;
+
+			if (entry.focused) {
+				cairo_set_source_rgba(cairo, 0.0, 1.0, 0.7, 0.5);
+			} else {
+				cairo_set_source_rgba(cairo, 0.2, 0.7, 1.0, 0.5);
+			}
+
+			if (i == this->entries.size() - 1) {
+				cairo_move_to(cairo, x + width - rounding, rounding);
+				cairo_arc(cairo, x + width - rounding, rounding, rounding, -90.0 * (M_PI / 180.0), 0.0);
+				cairo_rectangle(cairo, x + width - rounding, rounding, rounding, bar_height - rounding * 2);
+				cairo_move_to(cairo, x + width - rounding, bar_height - rounding);
+				cairo_arc(cairo, x + width - rounding, bar_height - rounding, rounding, 0.0, 90.0 * (M_PI / 180.0));
+				width -= rounding;
+			}
+
+			if (i == 0) {
+				cairo_move_to(cairo, x + rounding, rounding);
+				cairo_arc(cairo, x + rounding, rounding, rounding, -180.0 * (M_PI / 180.0), -90.0 * (M_PI / 180.0));
+				cairo_rectangle(cairo, x, rounding, rounding, bar_height - rounding * 2);
+				cairo_move_to(cairo, x + rounding, bar_height - rounding);
+				cairo_arc(cairo, x + rounding, bar_height - rounding, rounding, -270.0 * (M_PI / 180.0), -180.0 * (M_PI / 180.0));
+				x += rounding;
+				width -= rounding;
+			}
+
+			cairo_rectangle(cairo, x, 0, width, bar_height);
+			cairo_fill(cairo);
+
+			i++;
+		}
+
+		auto data = cairo_image_surface_get_data(cairo_surface);
+		this->texture.allocate();
+
+		glBindTexture(GL_TEXTURE_2D, this->texture.m_iTexID);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+	#ifdef GLES32
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_R, GL_BLUE);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_B, GL_RED);
+	#endif
+
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bar_width, bar_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
+
+		cairo_destroy(cairo);
+		cairo_surface_destroy(cairo_surface);
+	} else {
+		glBindTexture(GL_TEXTURE_2D, this->texture.m_iTexID);
+	}
+}
+
+Hy3TabGroup::Hy3TabGroup(Hy3Node& node) {
+	this->pos.create(AVARTYPE_VECTOR, g_pConfigManager->getAnimationPropertyConfig("windowsIn"), nullptr, AVARDAMAGE_NONE);
+	this->size.create(AVARTYPE_VECTOR, g_pConfigManager->getAnimationPropertyConfig("windowsIn"), nullptr, AVARDAMAGE_NONE);
+	Debug::log(LOG, "registered anims");
+	this->pos.registerVar();
+	this->size.registerVar();
+
+	this->updateWithGroup(node);
+	this->pos.warp(false);
+	this->size.warp(false);
+}
+
+void Hy3TabGroup::updateWithGroup(Hy3Node& node) {
+	static const auto* gaps_in = &HyprlandAPI::getConfigValue(PHANDLE, "general:gaps_in")->intValue;
+	static const auto* bar_height = &HyprlandAPI::getConfigValue(PHANDLE, "plugin:hy3:tabs:bar_height")->intValue;
+
+	auto tpos = node.position + Vector2D(*gaps_in, *gaps_in);
+	auto tsize = Vector2D(node.size.x - *gaps_in * 2, *bar_height);
+
+	if (this->pos.goalv() != tpos) this->pos = tpos;
+	if (this->size.goalv() != tsize) this->size = tsize;
+
+	this->bar.updateWithGroupEntries(node);
+}
+
+void Hy3TabGroup::renderTabBar() {
+
+	auto* monitor = g_pHyprOpenGL->m_RenderData.pMonitor;
+	auto scale = monitor->scale;
+
+	auto pos = this->pos.vec();
+	auto size = this->size.vec();
+
+	auto scaled_pos = Vector2D(std::round(pos.x * scale), std::round(pos.y * scale));
+	auto scaled_size = Vector2D(std::round(size.x * scale), std::round(size.y * scale));
+	auto box = wlr_box { scaled_pos.x, scaled_pos.y, scaled_size.x, scaled_size.y };
+
+	this->bar.setPos(scaled_pos);
+	this->bar.setSize(scaled_size);
+
+	this->bar.prepareTexture();
+	g_pHyprOpenGL->renderTexture(this->bar.texture, &box, 1.0);
+	g_pHyprRenderer->damageBox(&box);
+}

src/TabGroup.hpp

@@ -0,0 +1,54 @@
+#pragma once
+
+#include <hyprland/src/helpers/AnimatedVariable.hpp>
+#include <hyprland/src/helpers/Vector2D.hpp>
+#include <vector>
+
+class Hy3TabGroup;
+
+#include "Hy3Layout.hpp"
+#include <hyprland/src/render/Texture.hpp>
+
+struct Hy3TabBarEntry {
+	std::string window_title;
+	bool urgent = false;
+	bool focused = false;
+};
+
+class Hy3TabBar {
+public:
+	CTexture texture;
+
+	void updateWithGroupEntries(Hy3Node&);
+	void setPos(Vector2D);
+	void setSize(Vector2D);
+
+	// Redraw the texture if necessary, and bind it to GL_TEXTURE_2D
+	void prepareTexture();
+private:
+	bool needs_redraw = true;
+
+	std::vector<Hy3TabBarEntry> entries;
+	// scaled pos/size
+	Vector2D pos;
+	Vector2D size;
+};
+
+class Hy3TabGroup {
+public:
+	Hy3TabBar bar;
+	CAnimatedVariable pos;
+	CAnimatedVariable size;
+
+	// initialize a group with the given node. UB if node is not a group.
+	Hy3TabGroup(Hy3Node&);
+
+	// update tab bar with node position and data. UB if node is not a group.
+	void updateWithGroup(Hy3Node&);
+	// render the scaled tab bar on the current monitor.
+	void renderTabBar();
+
+private:
+	// moving a Hy3TabGroup will unregister any active animations
+	Hy3TabGroup(Hy3TabGroup&&) = delete;
+};

src/main.cpp

@@ -45,6 +45,8 @@ void dispatch_makegroup(std::string arg) {
 		g_Hy3Layout->makeGroupOnWorkspace(workspace, Hy3GroupLayout::SplitH);
 	} else if (arg == "v") {
 		g_Hy3Layout->makeGroupOnWorkspace(workspace, Hy3GroupLayout::SplitV);
+	} else if (arg == "tab") {
+		g_Hy3Layout->makeGroupOnWorkspace(workspace, Hy3GroupLayout::Tabbed);
 	} else if (arg == "opposite") {
 		g_Hy3Layout->makeOppositeGroupOnWorkspace(workspace);
 	}
@@ -104,6 +106,8 @@ APICALL EXPORT PLUGIN_DESCRIPTION_INFO PLUGIN_INIT(HANDLE handle) {
 	selection_hook::init();
 
 	HyprlandAPI::addConfigValue(PHANDLE, "plugin:hy3:no_gaps_when_only", SConfigValue{.intValue = 0});
+	HyprlandAPI::addConfigValue(PHANDLE, "plugin:hy3:tabs:bar_height", SConfigValue{.intValue = 15});
+	HyprlandAPI::addConfigValue(PHANDLE, "plugin:hy3:tabs:rounding", SConfigValue{.intValue = 3});
 
 	g_Hy3Layout = std::make_unique<Hy3Layout>();
 	HyprlandAPI::addLayout(PHANDLE, "hy3", g_Hy3Layout.get());