1 files changed, 205 insertions, 0 deletions
diff --git a/src/ui/knot/knot-holder-entity.h b/src/ui/knot/knot-holder-entity.h
new file mode 100644
index 0000000..3195c2a
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+++ b/src/ui/knot/knot-holder-entity.h
@@ -0,0 +1,205 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_KNOT_HOLDER_ENTITY_H
+#define SEEN_KNOT_HOLDER_ENTITY_H
+/*
+ * Authors:
+ *   Mitsuru Oka <oka326@parkcity.ne.jp>
+ *   Maximilian Albert <maximilian.albert@gmail.com>
+ *
+ * Copyright (C) 1999-2001 Lauris Kaplinski
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ * Copyright (C) 2001 Mitsuru Oka
+ * Copyright (C) 2004 Monash University
+ * Copyright (C) 2008 Maximilian Albert
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/forward.h>
+
+#include "knot.h"
+#include "snapper.h"
+
+#include "display/control/canvas-item-enums.h"
+
+class SPHatch;
+class SPItem;
+class SPKnot;
+class SPDesktop;
+class SPPattern;
+class KnotHolder;
+
+namespace Inkscape {
+namespace LivePathEffect {
+    class Effect;
+} // namespace LivePathEffect
+} // namespace Inkscape
+
+typedef void (* SPKnotHolderSetFunc) (SPItem *item, Geom::Point const &p, Geom::Point const &origin, unsigned int state);
+typedef Geom::Point (* SPKnotHolderGetFunc) (SPItem *item);
+
+/**
+ * KnotHolderEntity definition.
+ */
+class KnotHolderEntity {
+public:
+    KnotHolderEntity() {}
+    virtual ~KnotHolderEntity();
+
+    void create(SPDesktop *desktop, SPItem *item, KnotHolder *parent,
+                Inkscape::CanvasItemCtrlType type = Inkscape::CANVAS_ITEM_CTRL_TYPE_DEFAULT,
+                Glib::ustring const & name = Glib::ustring("unknown"),
+                char const *tip = "",
+                guint32 color = 0xffffff00);
+
+    /* the get/set/click handlers are virtual functions; each handler class for a knot
+       should be derived from KnotHolderEntity and override these functions */
+    virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, unsigned int state) = 0;
+    virtual void knot_ungrabbed(Geom::Point const &p, Geom::Point const &origin, unsigned int state) = 0;
+    virtual bool knot_missing() const { return false; }
+    virtual Geom::Point knot_get() const = 0;
+    virtual void knot_click(unsigned int /*state*/) {}
+
+    void update_knot();
+
+//private:
+    Geom::Point snap_knot_position(Geom::Point const &p, unsigned int state);
+    Geom::Point snap_knot_position_constrained(Geom::Point const &p, Inkscape::Snapper::SnapConstraint const &constraint, unsigned int state);
+
+    SPKnot *knot = nullptr;
+    SPItem *item = nullptr;
+    SPDesktop *desktop = nullptr;
+    KnotHolder *parent_holder = nullptr;
+
+    int my_counter = 0;
+    inline static int counter = 0;
+
+    /** Connection to \a knot's "moved" signal. */
+    unsigned int   handler_id = 0;
+    /** Connection to \a knot's "clicked" signal. */
+    unsigned int   _click_handler_id = 0;
+    /** Connection to \a knot's "ungrabbed" signal. */
+    unsigned int   _ungrab_handler_id = 0;
+
+private:
+    sigc::connection _mousedown_connection;
+    sigc::connection _moved_connection;
+    sigc::connection _click_connection;
+    sigc::connection _ungrabbed_connection;
+};
+
+// derived KnotHolderEntity class for LPEs
+class LPEKnotHolderEntity : public KnotHolderEntity {
+public:
+    LPEKnotHolderEntity(Inkscape::LivePathEffect::Effect *effect) : _effect(effect) {};
+    void knot_ungrabbed(Geom::Point const &p, Geom::Point const &origin, guint state) override;
+protected:
+    Inkscape::LivePathEffect::Effect *_effect;
+};
+
+/* pattern manipulation */
+
+class PatternKnotHolderEntity : public KnotHolderEntity {
+  public:
+    PatternKnotHolderEntity(bool fill) : KnotHolderEntity(), _fill(fill) {}
+    bool knot_missing() const override;
+    void knot_ungrabbed(Geom::Point const &p, Geom::Point const &origin, guint state) override{};
+
+  protected:
+    // true if the entity tracks fill, false for stroke
+    bool _fill;
+    SPPattern *_pattern() const;
+};
+
+class PatternKnotHolderEntityXY : public PatternKnotHolderEntity {
+public:
+    PatternKnotHolderEntityXY(bool fill) : PatternKnotHolderEntity(fill) {}
+    Geom::Point knot_get() const override;
+    void knot_set(Geom::Point const &p, Geom::Point const &origin, unsigned int state) override;
+};
+
+class PatternKnotHolderEntityAngle : public PatternKnotHolderEntity {
+public:
+    PatternKnotHolderEntityAngle(bool fill) : PatternKnotHolderEntity(fill) {}
+    Geom::Point knot_get() const override;
+    void knot_set(Geom::Point const &p, Geom::Point const &origin, unsigned int state) override;
+};
+
+class PatternKnotHolderEntityScale : public PatternKnotHolderEntity {
+public:
+    PatternKnotHolderEntityScale(bool fill) : PatternKnotHolderEntity(fill) {}
+    Geom::Point knot_get() const override;
+    void knot_set(Geom::Point const &p, Geom::Point const &origin, unsigned int state) override;
+};
+
+/* Hatch manipulation */
+class HatchKnotHolderEntity : public KnotHolderEntity {
+  public:
+    HatchKnotHolderEntity(bool fill)
+        : KnotHolderEntity()
+        , _fill(fill)
+    {
+    }
+    bool knot_missing() const override;
+    void knot_ungrabbed(Geom::Point const &p, Geom::Point const &origin, guint state) override{};
+
+  protected:
+    // true if the entity tracks fill, false for stroke
+    bool _fill;
+    SPHatch *_hatch() const;
+};
+
+class HatchKnotHolderEntityXY : public HatchKnotHolderEntity {
+  public:
+    HatchKnotHolderEntityXY(bool fill)
+        : HatchKnotHolderEntity(fill)
+    {
+    }
+    Geom::Point knot_get() const override;
+    void knot_set(Geom::Point const &p, Geom::Point const &origin, unsigned int state) override;
+};
+
+class HatchKnotHolderEntityAngle : public HatchKnotHolderEntity {
+  public:
+    HatchKnotHolderEntityAngle(bool fill)
+        : HatchKnotHolderEntity(fill)
+    {
+    }
+    Geom::Point knot_get() const override;
+    void knot_set(Geom::Point const &p, Geom::Point const &origin, unsigned int state) override;
+};
+
+class HatchKnotHolderEntityScale : public HatchKnotHolderEntity {
+  public:
+    HatchKnotHolderEntityScale(bool fill)
+        : HatchKnotHolderEntity(fill)
+    {
+    }
+    Geom::Point knot_get() const override;
+    void knot_set(Geom::Point const &p, Geom::Point const &origin, unsigned int state) override;
+};
+
+
+/* Filter manipulation */
+class FilterKnotHolderEntity : public KnotHolderEntity {
+  public:
+    FilterKnotHolderEntity(bool topleft) : KnotHolderEntity(), _topleft(topleft) {}
+    Geom::Point knot_get() const override;
+    void knot_ungrabbed(Geom::Point const &p, Geom::Point const &origin, guint state) override {};
+    void knot_set(Geom::Point const &p, Geom::Point const &origin, unsigned int state) override;
+private:
+    bool _topleft; // true for topleft point, false for bottomright
+};
+
+#endif /* !SEEN_KNOT_HOLDER_ENTITY_H */
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :