From 723870337f299d4c80aa0048144f3a1ca1c885bd Mon Sep 17 00:00:00 2001
From: Vaxry <43317083+vaxerski@users.noreply.github.com>
Date: Sat, 21 Feb 2026 21:30:39 +0000
Subject: layout: rethonk layouts from the ground up (#12890)

Rewrites layouts to be much smaller, and deal with much less annoying
BS. Improves the overall architecture, unifies handling of pseudotiling,
and various other improvements.
---
 src/layout/supplementary/WorkspaceAlgoMatcher.cpp | 139 ++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 src/layout/supplementary/WorkspaceAlgoMatcher.cpp

(limited to 'src/layout/supplementary/WorkspaceAlgoMatcher.cpp')

diff --git a/src/layout/supplementary/WorkspaceAlgoMatcher.cpp b/src/layout/supplementary/WorkspaceAlgoMatcher.cpp
new file mode 100644
index 00000000..b476c3a0
--- /dev/null
+++ b/src/layout/supplementary/WorkspaceAlgoMatcher.cpp
@@ -0,0 +1,139 @@
+#include "WorkspaceAlgoMatcher.hpp"
+
+#include "../../config/ConfigValue.hpp"
+#include "../../config/ConfigManager.hpp"
+
+#include "../algorithm/Algorithm.hpp"
+#include "../space/Space.hpp"
+
+#include "../algorithm/floating/default/DefaultFloatingAlgorithm.hpp"
+#include "../algorithm/tiled/dwindle/DwindleAlgorithm.hpp"
+#include "../algorithm/tiled/master/MasterAlgorithm.hpp"
+#include "../algorithm/tiled/scrolling/ScrollingAlgorithm.hpp"
+#include "../algorithm/tiled/monocle/MonocleAlgorithm.hpp"
+
+#include "../../Compositor.hpp"
+
+using namespace Layout;
+using namespace Layout::Supplementary;
+
+constexpr const char*            DEFAULT_FLOATING_ALGO = "default";
+constexpr const char*            DEFAULT_TILED_ALGO    = "dwindle";
+
+const UP<CWorkspaceAlgoMatcher>& Supplementary::algoMatcher() {
+    static UP<CWorkspaceAlgoMatcher> m = makeUnique<CWorkspaceAlgoMatcher>();
+    return m;
+}
+
+CWorkspaceAlgoMatcher::CWorkspaceAlgoMatcher() {
+    m_tiledAlgos = {
+        {"dwindle", [] { return makeUnique<Tiled::CDwindleAlgorithm>(); }},
+        {"master", [] { return makeUnique<Tiled::CMasterAlgorithm>(); }},
+        {"scrolling", [] { return makeUnique<Tiled::CScrollingAlgorithm>(); }},
+        {"monocle", [] { return makeUnique<Tiled::CMonocleAlgorithm>(); }},
+    };
+
+    m_floatingAlgos = {
+        {"default", [] { return makeUnique<Floating::CDefaultFloatingAlgorithm>(); }},
+    };
+
+    m_algoNames = {
+        {&typeid(Tiled::CDwindleAlgorithm), "dwindle"},
+        {&typeid(Tiled::CMasterAlgorithm), "master"},
+        {&typeid(Tiled::CScrollingAlgorithm), "scrolling"},
+        {&typeid(Tiled::CMonocleAlgorithm), "monocle"},
+        {&typeid(Floating::CDefaultFloatingAlgorithm), "default"},
+    };
+}
+
+bool CWorkspaceAlgoMatcher::registerTiledAlgo(const std::string& name, const std::type_info* typeInfo, std::function<UP<ITiledAlgorithm>()>&& factory) {
+    if (m_tiledAlgos.contains(name) || m_floatingAlgos.contains(name))
+        return false;
+
+    m_tiledAlgos.emplace(name, std::move(factory));
+    m_algoNames.emplace(typeInfo, name);
+
+    updateWorkspaceLayouts();
+
+    return true;
+}
+
+bool CWorkspaceAlgoMatcher::registerFloatingAlgo(const std::string& name, const std::type_info* typeInfo, std::function<UP<IFloatingAlgorithm>()>&& factory) {
+    if (m_tiledAlgos.contains(name) || m_floatingAlgos.contains(name))
+        return false;
+
+    m_floatingAlgos.emplace(name, std::move(factory));
+    m_algoNames.emplace(typeInfo, name);
+
+    updateWorkspaceLayouts();
+
+    return true;
+}
+
+bool CWorkspaceAlgoMatcher::unregisterAlgo(const std::string& name) {
+    if (!m_tiledAlgos.contains(name) && !m_floatingAlgos.contains(name))
+        return false;
+
+    std::erase_if(m_algoNames, [&name](const auto& e) { return e.second == name; });
+
+    if (m_floatingAlgos.contains(name))
+        m_floatingAlgos.erase(name);
+    else
+        m_tiledAlgos.erase(name);
+
+    // this is needed here to avoid situations where a plugin unloads and we still have a UP
+    // to a plugin layout
+    updateWorkspaceLayouts();
+
+    return true;
+}
+
+UP<ITiledAlgorithm> CWorkspaceAlgoMatcher::algoForNameTiled(const std::string& s) {
+    if (m_tiledAlgos.contains(s))
+        return m_tiledAlgos.at(s)();
+    return m_tiledAlgos.at(DEFAULT_TILED_ALGO)();
+}
+
+UP<IFloatingAlgorithm> CWorkspaceAlgoMatcher::algoForNameFloat(const std::string& s) {
+    if (m_floatingAlgos.contains(s))
+        return m_floatingAlgos.at(s)();
+    return m_floatingAlgos.at(DEFAULT_FLOATING_ALGO)();
+}
+
+std::string CWorkspaceAlgoMatcher::tiledAlgoForWorkspace(const PHLWORKSPACE& w) {
+    static auto PLAYOUT = CConfigValue<Hyprlang::STRING>("general:layout");
+
+    auto        rule = g_pConfigManager->getWorkspaceRuleFor(w);
+    return rule.layout.value_or(*PLAYOUT);
+}
+
+SP<CAlgorithm> CWorkspaceAlgoMatcher::createAlgorithmForWorkspace(PHLWORKSPACE w) {
+    return CAlgorithm::create(algoForNameTiled(tiledAlgoForWorkspace(w)), makeUnique<Floating::CDefaultFloatingAlgorithm>(), w->m_space);
+}
+
+void CWorkspaceAlgoMatcher::updateWorkspaceLayouts() {
+    // TODO: make this ID-based, string comparison is slow
+    for (const auto& ws : g_pCompositor->getWorkspaces()) {
+        if (!ws)
+            continue;
+
+        const auto& TILED_ALGO = ws->m_space->algorithm()->tiledAlgo();
+
+        if (!TILED_ALGO)
+            continue;
+
+        const auto LAYOUT_TO_USE = tiledAlgoForWorkspace(ws.lock());
+
+        if (m_algoNames.contains(&typeid(*TILED_ALGO.get())) && m_algoNames.at(&typeid(*TILED_ALGO.get())) == LAYOUT_TO_USE)
+            continue;
+
+        // needs a switchup
+        ws->m_space->algorithm()->updateTiledAlgo(algoForNameTiled(LAYOUT_TO_USE));
+    }
+}
+
+std::string CWorkspaceAlgoMatcher::getNameForTiledAlgo(const std::type_info* type) {
+    if (m_algoNames.contains(type))
+        return m_algoNames.at(type);
+    return "unknown";
+}
-- 
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