From 9c7bdde7adbecbfe254da6fa92e0f3bdc1f47546 Mon Sep 17 00:00:00 2001
From: knutux <knutux@users.sourceforge.net>
Date: Thu, 4 May 2006 11:13:11 +0000
Subject: [PATCH] Temporary fix for broken snap functionality: as named view
 constructor is never called, virtual tables of Snapper derived classes are
 never initialized. Fix - calling constructor/destructor on SPNamedView
 init/release.

---
 src/grid-snapper.cpp   | 4 ++++
 src/grid-snapper.h     | 1 +
 src/guide-snapper.cpp  | 4 ++++
 src/guide-snapper.h    | 1 +
 src/line-snapper.h     | 3 ++-
 src/object-snapper.cpp | 4 ++++
 src/object-snapper.h   | 3 ++-
 src/snapper.h          | 1 +
 src/sp-namedview.cpp   | 5 +++++
 9 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/src/grid-snapper.cpp b/src/grid-snapper.cpp
index f1d4e4bf6..419dc4b82 100644
--- a/src/grid-snapper.cpp
+++ b/src/grid-snapper.cpp
@@ -39,6 +39,10 @@ Inkscape::LineSnapper::LineList Inkscape::GridSnapper::_getSnapLines(NR::Point c
 {
     LineList s;
 
+    if ( NULL == _named_view ) {
+        return s;
+    }
+
     SPCGrid *griditem = NULL;
     for (GSList *l = _named_view->gridviews; l != NULL; l = l->next) {
         // FIXME : this is a hack since there is only one view for now
diff --git a/src/grid-snapper.h b/src/grid-snapper.h
index 247823ac7..73a1f2500 100644
--- a/src/grid-snapper.h
+++ b/src/grid-snapper.h
@@ -24,6 +24,7 @@ namespace Inkscape
 class GridSnapper : public LineSnapper
 {
 public:
+    GridSnapper() {}
     GridSnapper(SPNamedView const *nv, NR::Coord const d);
 
 private:    
diff --git a/src/guide-snapper.cpp b/src/guide-snapper.cpp
index fbf1af0af..a05ecd3e6 100644
--- a/src/guide-snapper.cpp
+++ b/src/guide-snapper.cpp
@@ -26,6 +26,10 @@ Inkscape::GuideSnapper::LineList Inkscape::GuideSnapper::_getSnapLines(NR::Point
 {
     LineList s;
 
+    if ( NULL == _named_view ) {
+        return s;
+    }
+
     for (GSList const *l = _named_view->guides; l != NULL; l = l->next) {
         SPGuide const *g = SP_GUIDE(l->data);
 
diff --git a/src/guide-snapper.h b/src/guide-snapper.h
index f4c7b2de7..654149f5c 100644
--- a/src/guide-snapper.h
+++ b/src/guide-snapper.h
@@ -28,6 +28,7 @@ namespace Inkscape
 class GuideSnapper : public LineSnapper
 {
 public:
+    GuideSnapper() {}
     GuideSnapper(SPNamedView const *nv, NR::Coord const d);
 
 private:
diff --git a/src/line-snapper.h b/src/line-snapper.h
index 581466d33..72afab76d 100644
--- a/src/line-snapper.h
+++ b/src/line-snapper.h
@@ -19,13 +19,14 @@ namespace Inkscape
 class LineSnapper : public Snapper
 {
 public:
+  LineSnapper() {}
   LineSnapper(SPNamedView const *nv, NR::Coord const d);
 
 protected:
   typedef std::list<std::pair<NR::Dim2, NR::Coord> > LineList;
 
 private:
-  SnappedPoint _doFreeSnap(NR::Point const &p,
+  virtual SnappedPoint _doFreeSnap(NR::Point const &p,
 			   std::list<SPItem const *> const &it) const;
   
   SnappedPoint _doConstrainedSnap(NR::Point const &p,
diff --git a/src/object-snapper.cpp b/src/object-snapper.cpp
index 6146c11b8..9a3f61525 100644
--- a/src/object-snapper.cpp
+++ b/src/object-snapper.cpp
@@ -144,6 +144,10 @@ void Inkscape::ObjectSnapper::_snapPaths(Inkscape::SnappedPoint &s,
 Inkscape::SnappedPoint Inkscape::ObjectSnapper::_doFreeSnap(NR::Point const &p,
                                                             std::list<SPItem const *> const &it) const
 {
+    if ( NULL == _named_view ) {
+        return SnappedPoint(p, NR_HUGE);
+    }
+
     /* Get a list of all the SPItems that we will try to snap to */
     std::list<SPItem*> cand;
     _findCandidates(cand, sp_document_root(_named_view->document), it, p);
diff --git a/src/object-snapper.h b/src/object-snapper.h
index 189e96e3e..98d457088 100644
--- a/src/object-snapper.h
+++ b/src/object-snapper.h
@@ -25,6 +25,7 @@ namespace Inkscape
 class ObjectSnapper : public Snapper
 {
 public:
+  ObjectSnapper() {}
   ObjectSnapper(SPNamedView const *nv, NR::Coord const d);
 
   void setSnapToNodes(bool s) {
@@ -44,7 +45,7 @@ public:
   }
   
 private:
-  SnappedPoint _doFreeSnap(NR::Point const &p,
+  virtual SnappedPoint _doFreeSnap(NR::Point const &p,
 			   std::list<SPItem const *> const &it) const;
 
   SnappedPoint _doConstrainedSnap(NR::Point const &p,
diff --git a/src/snapper.h b/src/snapper.h
index 02f7cb7e9..2f3c487d6 100644
--- a/src/snapper.h
+++ b/src/snapper.h
@@ -27,6 +27,7 @@ namespace Inkscape
 class Snapper
 {
 public:
+    Snapper() {}
     Snapper(SPNamedView const *nv, ::NR::Coord const d);
     virtual ~Snapper() {}
 
diff --git a/src/sp-namedview.cpp b/src/sp-namedview.cpp
index bd7793ca1..4be180237 100644
--- a/src/sp-namedview.cpp
+++ b/src/sp-namedview.cpp
@@ -104,6 +104,9 @@ static void sp_namedview_class_init(SPNamedViewClass * klass)
 
 static void sp_namedview_init(SPNamedView *nv)
 {
+    // explicitly call a contructor
+    new(nv) SPNamedView();
+
     nv->editable = TRUE;
     nv->showgrid = FALSE;
     nv->showguides = TRUE;
@@ -202,6 +205,8 @@ static void sp_namedview_release(SPObject *object)
     if (((SPObjectClass *) parent_class)->release) {
         ((SPObjectClass *) parent_class)->release(object);
     }
+
+    namedview->~SPNamedView();
 }
 
 static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *value)
-- 
2.30.2