Code

Added example file for feTurbulence effect
[inkscape.git] / src / sp-namedview.cpp
index 319e0ba39b4f330521942139b2d675d8460fd7cc..f738828e537c398de284bd4bb1e41f05a6c10bff 100644 (file)
@@ -105,6 +105,7 @@ static void sp_namedview_init(SPNamedView *nv)
 {
     nv->editable = TRUE;
     nv->showguides = TRUE;
+    nv->grids_visible = false;
     nv->showborder = TRUE;
     nv->showpageshadow = TRUE;
 
@@ -119,6 +120,94 @@ static void sp_namedview_init(SPNamedView *nv)
     new (&nv->snap_manager) SnapManager(nv);
 }
 
+static void sp_namedview_generate_old_grid(SPNamedView * nv, SPDocument *document, Inkscape::XML::Node *repr) {
+    bool old_grid_settings_present = false;
+
+    // set old settings
+    const char* gridspacingx    = "1px";
+    const char* gridspacingy    = "1px";
+    const char* gridoriginy     = "0px";
+    const char* gridoriginx     = "0px";
+    const char* gridempspacing  = "5";
+    const char* gridcolor       = "#0000ff";
+    const char* gridempcolor    = "#0000ff";
+    const char* gridopacity     = "0.2";
+    const char* gridempopacity  = "0.4";
+
+    const char* value = NULL;
+    if ((value = repr->attribute("gridoriginx"))) {
+        gridspacingx = value;
+        old_grid_settings_present = true;
+    }
+    if ((value = repr->attribute("gridoriginy"))) {
+        gridoriginy = value;
+        old_grid_settings_present = true;
+    }
+    if ((value = repr->attribute("gridspacingx"))) {
+        gridspacingx = value;
+        old_grid_settings_present = true;
+    }
+    if ((value = repr->attribute("gridspacingy"))) {
+        gridspacingy = value;
+        old_grid_settings_present = true;
+    }
+    if ((value = repr->attribute("gridcolor"))) {
+        gridcolor = value;
+        old_grid_settings_present = true;
+    }
+    if ((value = repr->attribute("gridempcolor"))) {
+        gridempcolor = value;
+        old_grid_settings_present = true;
+    }
+    if ((value = repr->attribute("gridempspacing"))) {
+        gridempspacing = value;
+        old_grid_settings_present = true;
+    }
+    if ((value = repr->attribute("gridopacity"))) {
+        gridopacity = value;
+        old_grid_settings_present = true;
+    }
+    if ((value = repr->attribute("gridempopacity"))) {
+        gridempopacity = value;
+        old_grid_settings_present = true;
+    }
+
+    if (old_grid_settings_present) {
+        // generate new xy grid with the correct settings
+        // first create the child xml node, then hook it to repr. This order is important, to not set off listeners to repr before the new node is complete.
+
+        Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
+        Inkscape::XML::Node *newnode = xml_doc->createElement("inkscape:grid");
+        newnode->setAttribute("id", "GridFromPre046Settings");
+        newnode->setAttribute("type", Inkscape::CanvasGrid::getSVGName(Inkscape::GRID_RECTANGULAR));
+        newnode->setAttribute("originx", gridoriginx);
+        newnode->setAttribute("originy", gridoriginy);
+        newnode->setAttribute("spacingx", gridspacingx);
+        newnode->setAttribute("spacingy", gridspacingy);
+        newnode->setAttribute("color", gridcolor);
+        newnode->setAttribute("empcolor", gridempcolor);
+        newnode->setAttribute("opacity", gridopacity);
+        newnode->setAttribute("empopacity", gridempopacity);
+        newnode->setAttribute("empspacing", gridempspacing);
+
+        repr->appendChild(newnode);
+        Inkscape::GC::release(newnode);
+
+        // remove all old settings
+        repr->setAttribute("gridoriginx", NULL);
+        repr->setAttribute("gridoriginy", NULL);
+        repr->setAttribute("gridspacingx", NULL);
+        repr->setAttribute("gridspacingy", NULL);
+        repr->setAttribute("gridcolor", NULL);
+        repr->setAttribute("gridempcolor", NULL);
+        repr->setAttribute("gridopacity", NULL);
+        repr->setAttribute("gridempopacity", NULL);
+        repr->setAttribute("gridempspacing", NULL);
+
+//        sp_document_done(doc, SP_VERB_DIALOG_NAMEDVIEW, _("Create new grid from pre0.46 grid settings"));
+    }
+}
+
 static void sp_namedview_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
 {
     SPNamedView *nv = (SPNamedView *) object;
@@ -131,6 +220,7 @@ static void sp_namedview_build(SPObject *object, SPDocument *document, Inkscape:
     sp_object_read_attr(object, "inkscape:document-units");
     sp_object_read_attr(object, "viewonly");
     sp_object_read_attr(object, "showguides");
+    sp_object_read_attr(object, "showgrid");
     sp_object_read_attr(object, "gridtolerance");
     sp_object_read_attr(object, "guidetolerance");
     sp_object_read_attr(object, "objecttolerance");
@@ -153,16 +243,21 @@ static void sp_namedview_build(SPObject *object, SPDocument *document, Inkscape:
     sp_object_read_attr(object, "inkscape:window-height");
     sp_object_read_attr(object, "inkscape:window-x");
     sp_object_read_attr(object, "inkscape:window-y");
-    sp_object_read_attr(object, "inkscape:snap-bbox");
+    sp_object_read_attr(object, "inkscape:snap-global");
+    sp_object_read_attr(object, "inkscape:snap-bbox");    
     sp_object_read_attr(object, "inkscape:snap-nodes");
+    sp_object_read_attr(object, "inkscape:snap-guide");
     sp_object_read_attr(object, "inkscape:snap-center");
+    sp_object_read_attr(object, "inkscape:snap-intersection-grid-guide");
+    sp_object_read_attr(object, "inkscape:snap-intersection-line-segments");
     sp_object_read_attr(object, "inkscape:object-paths");
     sp_object_read_attr(object, "inkscape:object-nodes");
+    sp_object_read_attr(object, "inkscape:bbox-paths");
+    sp_object_read_attr(object, "inkscape:bbox-nodes");    
     sp_object_read_attr(object, "inkscape:current-layer");
     sp_object_read_attr(object, "inkscape:connector-spacing");
 
     /* Construct guideline list */
-
     for (SPObject *o = sp_object_first_child(SP_OBJECT(og)) ; o != NULL; o = SP_OBJECT_NEXT(o) ) {
         if (SP_IS_GUIDE(o)) {
             SPGuide * g = SP_GUIDE(o);
@@ -170,6 +265,9 @@ static void sp_namedview_build(SPObject *object, SPDocument *document, Inkscape:
             g_object_set(G_OBJECT(g), "color", nv->guidecolor, "hicolor", nv->guidehicolor, NULL);
         }
     }
+
+    // backwards compatibility with grid settings (pre 0.46)
+    sp_namedview_generate_old_grid(nv, document, repr);
 }
 
 static void sp_namedview_release(SPObject *object)
@@ -201,11 +299,11 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
     SPUnit const &px = sp_unit_get_by_id(SP_UNIT_PX);
 
     switch (key) {
-       case SP_ATTR_VIEWONLY:
+    case SP_ATTR_VIEWONLY:
             nv->editable = (!value);
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_SHOWGUIDES:
+    case SP_ATTR_SHOWGUIDES:
             if (!value) { // show guides if not specified, for backwards compatibility
                 nv->showguides = TRUE;
             } else {
@@ -214,7 +312,15 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
             sp_namedview_setup_guides(nv);
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_GRIDTOLERANCE:
+    case SP_ATTR_SHOWGRIDS:
+            if (!value) { // don't show grids if not specified, for backwards compatibility
+                nv->grids_visible = false;
+            } else {
+                nv->grids_visible = sp_str_to_bool(value);
+            }
+            object->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            break;
+    case SP_ATTR_GRIDTOLERANCE:
             nv->gridtoleranceunit = &px;
             nv->gridtolerance = DEFAULTTOLERANCE;
             if (value) {
@@ -222,7 +328,7 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
             }
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_GUIDETOLERANCE:
+    case SP_ATTR_GUIDETOLERANCE:
             nv->guidetoleranceunit = &px;
             nv->guidetolerance = DEFAULTTOLERANCE;
             if (value) {
@@ -238,7 +344,7 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
             }
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_GUIDECOLOR:
+    case SP_ATTR_GUIDECOLOR:
             nv->guidecolor = (nv->guidecolor & 0xff) | (DEFAULTGUIDECOLOR & 0xffffff00);
             if (value) {
                 nv->guidecolor = (nv->guidecolor & 0xff) | sp_svg_read_color(value, nv->guidecolor);
@@ -248,7 +354,7 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
             }
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_GUIDEOPACITY:
+    case SP_ATTR_GUIDEOPACITY:
             nv->guidecolor = (nv->guidecolor & 0xffffff00) | (DEFAULTGUIDECOLOR & 0xff);
             sp_nv_read_opacity(value, &nv->guidecolor);
             for (GSList *l = nv->guides; l != NULL; l = l->next) {
@@ -256,7 +362,7 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
             }
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_GUIDEHICOLOR:
+    case SP_ATTR_GUIDEHICOLOR:
             nv->guidehicolor = (nv->guidehicolor & 0xff) | (DEFAULTGUIDEHICOLOR & 0xffffff00);
             if (value) {
                 nv->guidehicolor = (nv->guidehicolor & 0xff) | sp_svg_read_color(value, nv->guidehicolor);
@@ -266,7 +372,7 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
             }
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_GUIDEHIOPACITY:
+    case SP_ATTR_GUIDEHIOPACITY:
             nv->guidehicolor = (nv->guidehicolor & 0xffffff00) | (DEFAULTGUIDEHICOLOR & 0xff);
             sp_nv_read_opacity(value, &nv->guidehicolor);
             for (GSList *l = nv->guides; l != NULL; l = l->next) {
@@ -274,16 +380,16 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
             }
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_SHOWBORDER:
+    case SP_ATTR_SHOWBORDER:
             nv->showborder = (value) ? sp_str_to_bool (value) : TRUE;
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_BORDERLAYER:
+    case SP_ATTR_BORDERLAYER:
             nv->borderlayer = SP_BORDER_LAYER_BOTTOM;
             if (value && !strcasecmp(value, "true")) nv->borderlayer = SP_BORDER_LAYER_TOP;
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_BORDERCOLOR:
+    case SP_ATTR_BORDERCOLOR:
             nv->bordercolor = (nv->bordercolor & 0xff) | (DEFAULTBORDERCOLOR & 0xffffff00);
             if (value) {
                 nv->bordercolor = (nv->bordercolor & 0xff) | sp_svg_read_color (value, nv->bordercolor);
@@ -302,12 +408,12 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
             }
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_INKSCAPE_PAGEOPACITY:
+    case SP_ATTR_INKSCAPE_PAGEOPACITY:
             nv->pagecolor = (nv->pagecolor & 0xffffff00) | (DEFAULTPAGECOLOR & 0xff);
             sp_nv_read_opacity(value, &nv->pagecolor);
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_INKSCAPE_PAGESHADOW:
+    case SP_ATTR_INKSCAPE_PAGESHADOW:
             nv->pageshadow = value? atoi(value) : 2; // 2 is the default
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
@@ -315,34 +421,38 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
             nv->showpageshadow = (value) ? sp_str_to_bool(value) : TRUE;
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_INKSCAPE_ZOOM:
+    case SP_ATTR_INKSCAPE_ZOOM:
             nv->zoom = value ? g_ascii_strtod(value, NULL) : 0; // zero means not set
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_INKSCAPE_CX:
+    case SP_ATTR_INKSCAPE_CX:
             nv->cx = value ? g_ascii_strtod(value, NULL) : HUGE_VAL; // HUGE_VAL means not set
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_INKSCAPE_CY:
+    case SP_ATTR_INKSCAPE_CY:
             nv->cy = value ? g_ascii_strtod(value, NULL) : HUGE_VAL; // HUGE_VAL means not set
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_INKSCAPE_WINDOW_WIDTH:
+    case SP_ATTR_INKSCAPE_WINDOW_WIDTH:
             nv->window_width = value? atoi(value) : -1; // -1 means not set
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_INKSCAPE_WINDOW_HEIGHT:
+    case SP_ATTR_INKSCAPE_WINDOW_HEIGHT:
             nv->window_height = value ? atoi(value) : -1; // -1 means not set
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_INKSCAPE_WINDOW_X:
+    case SP_ATTR_INKSCAPE_WINDOW_X:
             nv->window_x = value ? atoi(value) : -1; // -1 means not set
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_INKSCAPE_WINDOW_Y:
+    case SP_ATTR_INKSCAPE_WINDOW_Y:
             nv->window_y = value ? atoi(value) : -1; // -1 means not set
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
+    case SP_ATTR_INKSCAPE_SNAP_GLOBAL:
+            nv->snap_manager.setSnapEnabledGlobally(value ? sp_str_to_bool(value) : TRUE);
+            object->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            break;
     case SP_ATTR_INKSCAPE_SNAP_BBOX:
                nv->snap_manager.setSnapModeBBox(value ? sp_str_to_bool(value) : FALSE);
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
@@ -355,6 +465,18 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
             nv->snap_manager.setIncludeItemCenter(value ? sp_str_to_bool(value) : FALSE);
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
+    case SP_ATTR_INKSCAPE_SNAP_GUIDE:
+            nv->snap_manager.setSnapModeGuide(value ? sp_str_to_bool(value) : FALSE);
+            object->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            break;
+    case SP_ATTR_INKSCAPE_SNAP_INTERS_GRIDGUIDE:
+            nv->snap_manager.setSnapIntersectionGG(value ? sp_str_to_bool(value) : TRUE);
+            object->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            break;
+    case SP_ATTR_INKSCAPE_SNAP_INTERS_LINESEGM:
+            nv->snap_manager.setSnapIntersectionLS(value ? sp_str_to_bool(value) : FALSE);
+            object->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            break;
     case SP_ATTR_INKSCAPE_OBJECT_PATHS:
             nv->snap_manager.object.setSnapToItemPath(value ? sp_str_to_bool(value) : FALSE);
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
@@ -363,16 +485,24 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
             nv->snap_manager.object.setSnapToItemNode(value ? sp_str_to_bool(value) : FALSE);
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_INKSCAPE_CURRENT_LAYER:
+    case SP_ATTR_INKSCAPE_BBOX_PATHS:
+            nv->snap_manager.object.setSnapToBBoxPath(value ? sp_str_to_bool(value) : FALSE);
+            object->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            break;
+    case SP_ATTR_INKSCAPE_BBOX_NODES:
+            nv->snap_manager.object.setSnapToBBoxNode(value ? sp_str_to_bool(value) : FALSE);            
+            object->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            break;
+    case SP_ATTR_INKSCAPE_CURRENT_LAYER:
             nv->default_layer_id = value ? g_quark_from_string(value) : 0;
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_INKSCAPE_CONNECTOR_SPACING:
+    case SP_ATTR_INKSCAPE_CONNECTOR_SPACING:
             nv->connector_spacing = value ? g_ascii_strtod(value, NULL) :
                     defaultConnSpacing;
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       case SP_ATTR_INKSCAPE_DOCUMENT_UNITS: {
+    case SP_ATTR_INKSCAPE_DOCUMENT_UNITS: {
             /* The default unit if the document doesn't override this: e.g. for files saved as
              * `plain SVG', or non-inkscape files, or files created by an inkscape 0.40 &
              * earlier.
@@ -412,8 +542,8 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
             nv->doc_units = new_unit;
             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
             break;
-       }
-       default:
+    }
+    default:
             if (((SPObjectClass *) (parent_class))->set) {
                 ((SPObjectClass *) (parent_class))->set(object, key, value);
             }
@@ -425,7 +555,7 @@ static void sp_namedview_set(SPObject *object, unsigned int key, const gchar *va
 * add a grid item from SVG-repr. Check if this namedview already has a gridobject for this one! If desktop=null, add grid-canvasitem to all desktops of this namedview,
 * otherwise only add it to the specified desktop.
 */
-static Inkscape::CanvasGrid* 
+static Inkscape::CanvasGrid*
 sp_namedview_add_grid(SPNamedView *nv, Inkscape::XML::Node *repr, SPDesktop *desktop) {
     Inkscape::CanvasGrid* grid = NULL;
     //check if namedview already has an object for this grid
@@ -436,7 +566,7 @@ sp_namedview_add_grid(SPNamedView *nv, Inkscape::XML::Node *repr, SPDesktop *des
             break;
         }
     }
-    
+
     if (!grid) {
         //create grid object
         Inkscape::GridType gridtype = Inkscape::CanvasGrid::getGridTypeFromSVGName(repr->attribute("type"));
@@ -450,10 +580,10 @@ sp_namedview_add_grid(SPNamedView *nv, Inkscape::XML::Node *repr, SPDesktop *des
         //Initialize the snapping parameters for the new grid
         bool enabled_node = nv->snap_manager.getSnapModeNode();
         bool enabled_bbox = nv->snap_manager.getSnapModeBBox();
-       grid->snapper->setSnapFrom(Inkscape::Snapper::SNAPPOINT_NODE, enabled_node);
-       grid->snapper->setSnapFrom(Inkscape::Snapper::SNAPPOINT_BBOX, enabled_bbox);
+        grid->snapper->setSnapFrom(Inkscape::Snapper::SNAPPOINT_NODE, enabled_node);
+        grid->snapper->setSnapFrom(Inkscape::Snapper::SNAPPOINT_BBOX, enabled_bbox);
     }
-    
+
     if (!desktop) {
         //add canvasitem to all desktops
         for (GSList *l = nv->views; l != NULL; l = l->next) {
@@ -476,12 +606,12 @@ static void sp_namedview_child_added(SPObject *object, Inkscape::XML::Node *chil
         (* ((SPObjectClass *) (parent_class))->child_added)(object, child, ref);
     }
 
-    const gchar *id = child->attribute("id");
     if (!strcmp(child->name(), "inkscape:grid")) {
         sp_namedview_add_grid(nv, child, NULL);
     } else {
-        SPObject *no = object->document->getObjectById(id);
-        g_assert(SP_IS_OBJECT(no));
+        SPObject *no = object->document->getObjectByRepr(child);
+        if ( !SP_IS_OBJECT(no) )
+            return;
 
         if (SP_IS_GUIDE(no)) {
             SPGuide *g = (SPGuide *) no;
@@ -585,6 +715,8 @@ void SPNamedView::show(SPDesktop *desktop)
             }
         }
     }
+
+    desktop->showGrids(grids_visible, false);
 }
 
 #define MIN_ONSCREEN_DISTANCE 50
@@ -595,7 +727,7 @@ void SPNamedView::show(SPDesktop *desktop)
 void sp_namedview_window_from_document(SPDesktop *desktop)
 {
     SPNamedView *nv = desktop->namedview;
-    gint geometry_from_file = 
+    gint geometry_from_file =
         (1==prefs_get_int_attribute("options.savewindowgeometry", "value", 0));
 
     // restore window size and position stored with the document
@@ -663,7 +795,7 @@ void sp_namedview_update_layers_from_document (SPDesktop *desktop)
 
 void sp_namedview_document_from_window(SPDesktop *desktop)
 {
-    gint save_geometry_in_file = 
+    gint save_geometry_in_file =
         (1==prefs_get_int_attribute("options.savewindowgeometry", "value", 0));
     Inkscape::XML::Node *view = SP_OBJECT_REPR(desktop->namedview);
     NR::Rect const r = desktop->get_display_area();
@@ -756,6 +888,26 @@ void sp_namedview_toggle_guides(SPDocument *doc, Inkscape::XML::Node *repr)
     sp_document_set_undo_sensitive(doc, saved);
 }
 
+void sp_namedview_show_grids(SPNamedView * namedview, bool show, bool dirty_document)
+{
+    namedview->grids_visible = show;
+
+    SPDocument *doc = SP_OBJECT_DOCUMENT (namedview);
+    Inkscape::XML::Node *repr = SP_OBJECT_REPR(namedview);
+
+    bool saved = sp_document_get_undo_sensitive(doc);
+    sp_document_set_undo_sensitive(doc, false);
+
+    sp_repr_set_boolean(repr, "showgrid", namedview->grids_visible);
+
+    /* we don't want the document to get dirty on startup; that's when
+       we call this function with dirty_document = false */
+    if (dirty_document) {
+        doc->rroot->setAttribute("sodipodi:modified", "true");
+    }
+    sp_document_set_undo_sensitive(doc, saved);
+}
+
 gchar const *SPNamedView::getName() const
 {
     SPException ex;
@@ -889,6 +1041,20 @@ SPMetric SPNamedView::getDefaultMetric() const
     }
 }
 
+/**
+ * Returns the first grid it could find that isEnabled(). Returns NULL, if none is enabled
+ */
+Inkscape::CanvasGrid * sp_namedview_get_first_enabled_grid(SPNamedView *namedview)
+{
+    for (GSList const * l = namedview->grids; l != NULL; l = l->next) {
+        Inkscape::CanvasGrid * grid = (Inkscape::CanvasGrid*) l->data;
+        if (grid->isEnabled())
+            return grid;
+    }
+
+    return NULL;
+}
+
 
 /*
   Local Variables: