input: Rewritten pointer constraints (#4889)

* rewritten constraints

* send pointer enter on activate if not pointer focus

* minor cleanup

* simulate movement on commit

* don't ignore oneshot prop

* various fixes

* dont send motion on confined

* update pos hint on region change

src/desktop/Constraint.hpp

@@ -0,0 +1,44 @@
+#pragma once
+
+#include "../includes.hpp"
+#include "../helpers/Region.hpp"
+#include "../helpers/WLListener.hpp"
+
+class CWLSurface;
+
+class CConstraint {
+  public:
+    CConstraint(wlr_pointer_constraint_v1* constraint, CWLSurface* owner);
+    ~CConstraint();
+
+    void        onCommit();
+    void        onDestroy();
+    void        onSetRegion();
+    CRegion     logicConstraintRegion();
+    bool        isLocked();
+    Vector2D    logicPositionHint();
+
+    void        deactivate();
+    void        activate();
+    bool        active();
+
+    CWLSurface* owner();
+
+  private:
+    bool                       m_bActive = false;
+    CWLSurface*                m_pOwner  = nullptr;
+    wlr_pointer_constraint_v1* m_pConstraint;
+
+    CRegion                    m_rRegion;
+    bool                       m_bHintSet             = false;
+    Vector2D                   m_vPositionHint        = {-1, -1};
+    Vector2D                   m_vCursorPosOnActivate = {-1, -1};
+
+    // for oneshot constraints that have been activated once
+    bool m_bDead = false;
+
+    DYNLISTENER(destroyConstraint);
+    DYNLISTENER(setConstraintRegion);
+
+    void initSignals();
+};