xdg: rewrite entire popup implementation

src/desktop/Popup.hpp

@@ -0,0 +1,69 @@
+#pragma once
+
+#include <vector>
+#include <memory>
+#include "Subsurface.hpp"
+
+struct SLayerSurface;
+
+class CPopup {
+  public:
+    // dummy head nodes
+    CPopup(CWindow* pOwner);
+    CPopup(SLayerSurface* pOwner);
+
+    // real nodes
+    CPopup(wlr_xdg_popup* popup, CPopup* pOwner);
+
+    ~CPopup();
+
+    Vector2D   coordsRelativeToParent();
+    Vector2D   coordsGlobal();
+
+    void       onNewPopup(wlr_xdg_popup* popup);
+    void       onDestroy();
+    void       onMap();
+    void       onUnmap();
+    void       onCommit();
+    void       onReposition();
+
+    void       recheckTree();
+
+    CWLSurface m_sWLSurface;
+
+  private:
+    // T1 owners, each popup has to have one of these
+    CWindow*       m_pWindowOwner = nullptr;
+    SLayerSurface* m_pLayerOwner  = nullptr;
+
+    // T2 owners
+    CPopup*        m_pParent = nullptr;
+
+    wlr_xdg_popup* m_pWLR = nullptr;
+
+    Vector2D       m_vLastSize = {};
+    Vector2D       m_vLastPos  = {};
+
+    bool           m_bRequestedReposition = false;
+
+    bool           m_bInert = false;
+
+    //
+    std::vector<std::unique_ptr<CPopup>> m_vChildren;
+    std::unique_ptr<CSubsurface>         m_pSubsurfaceHead;
+
+    // signals
+    DYNLISTENER(newPopup);
+    DYNLISTENER(destroyPopup);
+    DYNLISTENER(mapPopup);
+    DYNLISTENER(unmapPopup);
+    DYNLISTENER(commitPopup);
+    DYNLISTENER(repositionPopup);
+
+    void     initAllSignals();
+    void     unconstrain();
+    void     recheckChildrenRecursive();
+
+    Vector2D localToGlobal(const Vector2D& rel);
+    Vector2D t1ParentCoords();
+};