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.

1 files changed, 86 insertions, 0 deletions

diff --git a/src/layout/LayoutManager.hpp b/src/layout/LayoutManager.hpp
new file mode 100644
index 00000000..638c9f4c
--- /dev/null
+++ b/src/layout/LayoutManager.hpp
@@ -0,0 +1,86 @@
+#pragma once
+
+#include "../helpers/memory/Memory.hpp"
+#include "../helpers/math/Math.hpp"
+#include "../managers/input/InputManager.hpp"
+
+#include "supplementary/DragController.hpp"
+
+#include <optional>
+#include <expected>
+
+enum eFullscreenMode : int8_t;
+
+namespace Layout {
+    class ITarget;
+    class CSpace;
+
+    enum eRectCorner : uint8_t {
+        CORNER_NONE        = 0,
+        CORNER_TOPLEFT     = (1 << 0),
+        CORNER_TOPRIGHT    = (1 << 1),
+        CORNER_BOTTOMRIGHT = (1 << 2),
+        CORNER_BOTTOMLEFT  = (1 << 3),
+    };
+
+    inline eRectCorner cornerFromBox(const CBox& box, const Vector2D& pos) {
+        const auto CENTER = box.middle();
+
+        if (pos.x < CENTER.x)
+            return pos.y < CENTER.y ? CORNER_TOPLEFT : CORNER_BOTTOMLEFT;
+        return pos.y < CENTER.y ? CORNER_TOPRIGHT : CORNER_BOTTOMRIGHT;
+    }
+
+    enum eSnapEdge : uint8_t {
+        SNAP_INVALID = 0,
+        SNAP_UP      = (1 << 0),
+        SNAP_DOWN    = (1 << 1),
+        SNAP_LEFT    = (1 << 2),
+        SNAP_RIGHT   = (1 << 3),
+    };
+
+    class CLayoutManager {
+      public:
+        CLayoutManager();
+        ~CLayoutManager() = default;
+
+        void                             newTarget(SP<ITarget> target, SP<CSpace> space);
+        void                             removeTarget(SP<ITarget> target);
+
+        void                             changeFloatingMode(SP<ITarget> target);
+
+        void                             beginDragTarget(SP<ITarget> target, eMouseBindMode mode);
+        void                             moveMouse(const Vector2D& mousePos);
+        void                             resizeTarget(const Vector2D& Δ, SP<ITarget> target, eRectCorner corner = CORNER_NONE);
+        void                             moveTarget(const Vector2D& Δ, SP<ITarget> target);
+        void                             endDragTarget();
+
+        std::expected<void, std::string> layoutMsg(const std::string_view& sv);
+
+        void                             fullscreenRequestForTarget(SP<ITarget> target, eFullscreenMode currentEffectiveMode, eFullscreenMode effectiveMode);
+
+        void                             switchTargets(SP<ITarget> a, SP<ITarget> b, bool preserveFocus = true);
+
+        void                             moveInDirection(SP<ITarget> target, const std::string& direction, bool silent = false);
+
+        SP<ITarget>                      getNextCandidate(SP<CSpace> space, SP<ITarget> from);
+
+        bool                             isReachable(SP<ITarget> target);
+
+        void                             bringTargetToTop(SP<ITarget> target);
+
+        std::optional<Vector2D>          predictSizeForNewTiledTarget();
+
+        void                             performSnap(Vector2D& sourcePos, Vector2D& sourceSize, SP<ITarget> target, eMouseBindMode mode, int corner, const Vector2D& beginSize);
+
+        void                             invalidateMonitorGeometries(PHLMONITOR);
+        void                             recalculateMonitor(PHLMONITOR);
+
+        const UP<Supplementary::CDragStateController>& dragController();
+
+      private:
+        UP<Supplementary::CDragStateController> m_dragStateController = makeUnique<Supplementary::CDragStateController>();
+    };
+}
+
+inline UP<Layout::CLayoutManager> g_layoutManager;
\ No newline at end of file