Convert a load more C-style pointer casts to GObject or C++ casts (merry christmas\!)

(bzr r11986)

21 files changed, 129 insertions, 146 deletions

diff --git a/src/widgets/button.cpp b/src/widgets/button.cpp
index 1ac083276..d7be6c9f0 100644
--- a/src/widgets/button.cpp
+++ b/src/widgets/button.cpp
@@ -76,11 +76,11 @@ GType sp_button_get_type(void)
 static void
 sp_button_class_init (SPButtonClass *klass)
 {
-	GObjectClass *object_class=(GObjectClass *)klass;
-	GtkWidgetClass *widget_class=(GtkWidgetClass *)klass;
-	GtkButtonClass *button_class=(GtkButtonClass *)klass;
+	GObjectClass *object_class=G_OBJECT_CLASS(klass);
+	GtkWidgetClass *widget_class=GTK_WIDGET_CLASS(klass);
+	GtkButtonClass *button_class=GTK_BUTTON_CLASS(klass);
 
-	parent_class = (GtkToggleButtonClass *)g_type_class_peek_parent (klass);
+	parent_class = GTK_TOGGLE_BUTTON_CLASS(g_type_class_peek_parent(klass));
 
 	object_class->dispose = sp_button_dispose;
 #if GTK_CHECK_VERSION(3,0,0)
@@ -123,7 +123,7 @@ static void sp_button_dispose(GObject *object)
     button->c_set_active.~connection();
     button->c_set_sensitive.~connection();
 
-	((GObjectClass *) (parent_class))->dispose(object);
+	(G_OBJECT_CLASS(parent_class))->dispose(object);
 }
 
 
@@ -185,7 +185,7 @@ sp_button_clicked (GtkButton *button)
 	SPButton *sp_button=SP_BUTTON (button);
 
 	if (sp_button->type == SP_BUTTON_TYPE_TOGGLE) {
-		((GtkButtonClass *) (parent_class))->clicked (button);
+		(GTK_BUTTON_CLASS(parent_class))->clicked (button);
 	}
 }
 
@@ -230,7 +230,7 @@ sp_button_new( Inkscape::IconSize size, SPButtonType type, SPAction *action, SPA
 	// The Inkscape style is no-relief buttons
 	gtk_button_set_relief (GTK_BUTTON (button), GTK_RELIEF_NONE);
 
-	return (GtkWidget *) button;
+	return GTK_WIDGET(button);
 }
 
 void
@@ -287,7 +287,7 @@ sp_button_set_action (SPButton *button, SPAction *action)
 		}
 	}
 
-	sp_button_set_composed_tooltip ((GtkWidget *) button, action);
+	sp_button_set_composed_tooltip(GTK_WIDGET(button), action);
 }
 
 static void
diff --git a/src/widgets/desktop-widget.cpp b/src/widgets/desktop-widget.cpp
index beca03c19..8f7b6445c 100644
--- a/src/widgets/desktop-widget.cpp
+++ b/src/widgets/desktop-widget.cpp
@@ -303,8 +303,8 @@ sp_desktop_widget_class_init (SPDesktopWidgetClass *klass)
 {
     dtw_parent_class = SP_VIEW_WIDGET_CLASS(g_type_class_peek_parent(klass));
 
-    GObjectClass *object_class = (GObjectClass *) klass;
-    GtkWidgetClass *widget_class = (GtkWidgetClass *) klass;
+    GObjectClass *object_class = G_OBJECT_CLASS(klass);
+    GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
 
     object_class->dispose = sp_desktop_widget_dispose;
 
@@ -424,7 +424,7 @@ void SPDesktopWidget::init( SPDesktopWidget *dtw )
     g_signal_connect (G_OBJECT (eventbox), "motion_notify_event", G_CALLBACK (sp_dt_vruler_event), dtw);
 
     // Horizontal scrollbar
-    dtw->hadj = (GtkAdjustment *) gtk_adjustment_new (0.0, -4000.0, 4000.0, 10.0, 100.0, 4.0);
+    dtw->hadj = GTK_ADJUSTMENT(gtk_adjustment_new(0.0, -4000.0, 4000.0, 10.0, 100.0, 4.0));
 
 #if GTK_CHECK_VERSION(3,0,0)
     dtw->hscrollbar = gtk_scrollbar_new(GTK_ORIENTATION_HORIZONTAL, GTK_ADJUSTMENT (dtw->hadj));
@@ -449,7 +449,7 @@ void SPDesktopWidget::init( SPDesktopWidget *dtw )
     g_signal_connect (G_OBJECT (dtw->sticky_zoom), "toggled", G_CALLBACK (sp_dtw_sticky_zoom_toggled), dtw);
 
     // Vertical scrollbar
-    dtw->vadj = (GtkAdjustment *) gtk_adjustment_new (0.0, -4000.0, 4000.0, 10.0, 100.0, 4.0);
+    dtw->vadj = GTK_ADJUSTMENT(gtk_adjustment_new(0.0, -4000.0, 4000.0, 10.0, 100.0, 4.0));
 
 #if GTK_CHECK_VERSION(3,0,0)
     dtw->vscrollbar = gtk_scrollbar_new(GTK_ORIENTATION_VERTICAL, GTK_ADJUSTMENT(dtw->vadj));
@@ -788,7 +788,7 @@ static void sp_desktop_widget_dispose(GObject *object)
 void
 SPDesktopWidget::updateTitle(gchar const* uri)
 {
-    Gtk::Window *window = (Gtk::Window*)g_object_get_data(G_OBJECT(this), "window");
+    Gtk::Window *window = static_cast<Gtk::Window*>(g_object_get_data(G_OBJECT(this), "window"));
 
     if (window) {
         gchar const *fname = uri;
@@ -1098,7 +1098,7 @@ SPDesktopWidget::shutdown()
             switch (response) {
             case GTK_RESPONSE_YES:
             {
-                Gtk::Window *window = (Gtk::Window*)g_object_get_data(G_OBJECT(this), "window");
+                Gtk::Window *window = static_cast<Gtk::Window*>(g_object_get_data(G_OBJECT(this), "window"));
 
                 doc->doRef();
                 sp_namedview_document_from_window(desktop);
@@ -1162,7 +1162,7 @@ SPDesktopWidget::shutdown()
             {
                 doc->doRef();
 
-                Gtk::Window *window = (Gtk::Window*)g_object_get_data(G_OBJECT(this), "window");
+                Gtk::Window *window = static_cast<Gtk::Window*>(g_object_get_data(G_OBJECT(this), "window"));
 
                 if (sp_file_save_dialog(*window, doc, Inkscape::Extension::FILE_SAVE_METHOD_INKSCAPE_SVG)) {
                     doc->doUnref();
@@ -1274,7 +1274,7 @@ SPDesktopWidget::getWindowGeometry (gint &x, gint &y, gint &w, gint &h)
     gboolean vis = gtk_widget_get_visible (GTK_WIDGET(this));
     (void)vis; // TODO figure out why it is here but not used.
 
-    Gtk::Window *window = (Gtk::Window*)g_object_get_data(G_OBJECT(this), "window");
+    Gtk::Window *window = static_cast<Gtk::Window*>(g_object_get_data(G_OBJECT(this), "window"));
 
     if (window)
     {
@@ -1286,7 +1286,7 @@ SPDesktopWidget::getWindowGeometry (gint &x, gint &y, gint &w, gint &h)
 void
 SPDesktopWidget::setWindowPosition (Geom::Point p)
 {
-    Gtk::Window *window = (Gtk::Window*)g_object_get_data(G_OBJECT(this), "window");
+    Gtk::Window *window = static_cast<Gtk::Window*>(g_object_get_data(G_OBJECT(this), "window"));
 
     if (window)
     {
@@ -1297,7 +1297,7 @@ SPDesktopWidget::setWindowPosition (Geom::Point p)
 void
 SPDesktopWidget::setWindowSize (gint w, gint h)
 {
-    Gtk::Window *window = (Gtk::Window*)g_object_get_data(G_OBJECT(this), "window");
+    Gtk::Window *window = static_cast<Gtk::Window*>(g_object_get_data(G_OBJECT(this), "window"));
 
     if (window)
     {
@@ -1315,10 +1315,10 @@ SPDesktopWidget::setWindowSize (gint w, gint h)
 void
 SPDesktopWidget::setWindowTransient (void *p, int transient_policy)
 {
-    Gtk::Window *window = (Gtk::Window*)g_object_get_data(G_OBJECT(this), "window");
+    Gtk::Window *window = static_cast<Gtk::Window*>(g_object_get_data(G_OBJECT(this), "window"));
     if (window)
     {
-        GtkWindow *w = (GtkWindow *) window->gobj();
+        GtkWindow *w = GTK_WINDOW(window->gobj());
         gtk_window_set_transient_for (GTK_WINDOW(p), w);
 
         /*
@@ -1563,7 +1563,7 @@ SPDesktopWidget::setToolboxSelectOneValue (gchar const *id, int value)
 {
     gpointer hb = sp_search_by_data_recursive(aux_toolbox, (gpointer) id);
     if (hb) {
-        ege_select_one_action_set_active((EgeSelectOneAction*) hb, value);
+        ege_select_one_action_set_active(EGE_SELECT_ONE_ACTION(hb), value);
     }
 }
 
diff --git a/src/widgets/font-selector.cpp b/src/widgets/font-selector.cpp
index dde511612..b17dcf470 100644
--- a/src/widgets/font-selector.cpp
+++ b/src/widgets/font-selector.cpp
@@ -113,7 +113,7 @@ GType sp_font_selector_get_type()
 
 static void sp_font_selector_class_init(SPFontSelectorClass *c)
 {
-    GObjectClass *object_class = (GObjectClass *) c;
+    GObjectClass *object_class = G_OBJECT_CLASS(c);
 
     fs_parent_class = (GtkHBoxClass* )g_type_class_peek_parent (c);
 
@@ -285,7 +285,7 @@ static void sp_font_selector_family_select_row(GtkTreeSelection *selection,
     for ( ; list ; list = list->next )
     {
         gtk_list_store_append (store, &iter);
-        gtk_list_store_set (store, &iter, 0, (char*)list->data, -1);
+        gtk_list_store_set (store, &iter, 0, static_cast<char*>(list->data), -1);
     }
 
     gtk_tree_view_set_model (GTK_TREE_VIEW (fsel->style_treeview), GTK_TREE_MODEL (store));
@@ -433,7 +433,7 @@ GtkWidget *sp_font_selector_new()
 {
     SPFontSelector *fsel = SP_FONT_SELECTOR(g_object_new(SP_TYPE_FONT_SELECTOR, NULL));
 
-    return (GtkWidget *) fsel;
+    return GTK_WIDGET(fsel);
 }
 
 /*
@@ -453,7 +453,7 @@ unsigned int sp_font_selector_get_best_style (font_instance *font, GList *list)
 
     char *incomingFontString = pango_font_description_to_string(incomingFont);
 
-    tempFont = (font_factory::Default())->FaceFromUIStrings(family.c_str(), (char*)list->data);
+    tempFont = (font_factory::Default())->FaceFromUIStrings(family.c_str(), static_cast<char*>(list->data));
 
     PangoFontDescription *bestMatchForFont = NULL;
     if (tempFont) {
@@ -469,7 +469,7 @@ unsigned int sp_font_selector_get_best_style (font_instance *font, GList *list)
     while (list) {
         currentStyleNumber++;
 
-        tempFont = font_factory::Default()->FaceFromUIStrings(family.c_str(), (char*)list->data);
+        tempFont = font_factory::Default()->FaceFromUIStrings(family.c_str(), static_cast<char*>(list->data));
 
         PangoFontDescription *currentMatchForFont = NULL;
         if (tempFont) {
diff --git a/src/widgets/gradient-image.cpp b/src/widgets/gradient-image.cpp
index 359a41167..2d58355db 100644
--- a/src/widgets/gradient-image.cpp
+++ b/src/widgets/gradient-image.cpp
@@ -69,8 +69,8 @@ GType sp_gradient_image_get_type(void)
 
 static void sp_gradient_image_class_init(SPGradientImageClass *klass)
 {
-	GtkWidgetClass *widget_class = (GtkWidgetClass *) klass;
-	parent_class = (GtkWidgetClass*)g_type_class_peek_parent (klass);
+	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
+	parent_class = GTK_WIDGET_CLASS(g_type_class_peek_parent (klass));
 
 #if GTK_CHECK_VERSION(3,0,0)
 //	GObjectClass *object_class = G_OBJECT_CLASS(klass); 
@@ -80,7 +80,7 @@ static void sp_gradient_image_class_init(SPGradientImageClass *klass)
 	widget_class->draw = sp_gradient_image_draw;
 	widget_class->destroy = sp_gradient_image_destroy;
 #else
-	GtkObjectClass *object_class = (GtkObjectClass *) klass;
+	GtkObjectClass *object_class = GTK_OBJECT_CLASS(klass);
 
 	object_class->destroy = sp_gradient_image_destroy;
 	widget_class->size_request = sp_gradient_image_size_request;
@@ -120,8 +120,8 @@ static void sp_gradient_image_destroy(GtkObject *object)
 	if (parent_class->destroy)
 		(* (parent_class)->destroy) (object);
 #else
-	if (((GtkObjectClass *) (parent_class))->destroy)
-		(* ((GtkObjectClass *) (parent_class))->destroy) (object);
+	if ((GTK_OBJECT_CLASS(parent_class))->destroy)
+		(* (GTK_OBJECT_CLASS(parent_class))->destroy) (object);
 #endif
 }
 
@@ -196,7 +196,7 @@ sp_gradient_image_new (SPGradient *gradient)
 
 	sp_gradient_image_set_gradient (image, gradient);
 
-	return (GtkWidget *) image;
+	return GTK_WIDGET(image);
 }
 
 GdkPixbuf*
diff --git a/src/widgets/gradient-selector.cpp b/src/widgets/gradient-selector.cpp
index 89a891284..2c6774fe9 100644
--- a/src/widgets/gradient-selector.cpp
+++ b/src/widgets/gradient-selector.cpp
@@ -86,9 +86,9 @@ GType sp_gradient_selector_get_type(void)
 
 static void sp_gradient_selector_class_init(SPGradientSelectorClass *klass)
 {
-    GObjectClass *object_class = (GObjectClass *) klass;
+    GObjectClass *object_class = G_OBJECT_CLASS(klass);
 
-    parent_class = (GtkVBoxClass*)g_type_class_peek_parent (klass);
+    parent_class = GTK_VBOX_CLASS(g_type_class_peek_parent (klass));
 
     signals[GRABBED] =  g_signal_new ("grabbed",
                                         G_TYPE_FROM_CLASS(object_class),
@@ -196,7 +196,7 @@ static void sp_gradient_selector_init(SPGradientSelector *sel)
     gtk_box_pack_start( GTK_BOX(sel), hb, FALSE, FALSE, 0 );
 
     sel->add = gtk_button_new ();
-    gtk_button_set_image((GtkButton*)sel->add , gtk_image_new_from_stock ( GTK_STOCK_ADD, GTK_ICON_SIZE_SMALL_TOOLBAR ) );
+    gtk_button_set_image(GTK_BUTTON(sel->add), gtk_image_new_from_stock ( GTK_STOCK_ADD, GTK_ICON_SIZE_SMALL_TOOLBAR ) );
 
     sel->nonsolid.push_back(sel->add);
     gtk_box_pack_start (GTK_BOX (hb), sel->add, FALSE, FALSE, 0);
@@ -207,7 +207,7 @@ static void sp_gradient_selector_init(SPGradientSelector *sel)
     gtk_widget_set_tooltip_text( sel->add, _("Create a duplicate gradient"));
 
     sel->edit = gtk_button_new ();
-    gtk_button_set_image((GtkButton*)sel->edit , gtk_image_new_from_stock ( GTK_STOCK_EDIT, GTK_ICON_SIZE_SMALL_TOOLBAR ) );
+    gtk_button_set_image(GTK_BUTTON(sel->edit), gtk_image_new_from_stock ( GTK_STOCK_EDIT, GTK_ICON_SIZE_SMALL_TOOLBAR ) );
 
     sel->nonsolid.push_back(sel->edit);
     gtk_box_pack_start (GTK_BOX (hb), sel->edit, FALSE, FALSE, 0);
@@ -217,7 +217,7 @@ static void sp_gradient_selector_init(SPGradientSelector *sel)
     gtk_widget_set_tooltip_text( sel->edit, _("Edit gradient"));
 
     sel->del = gtk_button_new ();
-    gtk_button_set_image((GtkButton*)sel->del , gtk_image_new_from_stock ( GTK_STOCK_REMOVE, GTK_ICON_SIZE_SMALL_TOOLBAR ) );
+    gtk_button_set_image(GTK_BUTTON(sel->del), gtk_image_new_from_stock ( GTK_STOCK_REMOVE, GTK_ICON_SIZE_SMALL_TOOLBAR ) );
 
     sel->swatch_widgets.push_back(sel->del);
     gtk_box_pack_start (GTK_BOX (hb), sel->del, FALSE, FALSE, 0);
@@ -251,8 +251,8 @@ static void sp_gradient_selector_dispose(GObject *object)
         sel->text_renderer = NULL;
     }
 
-    if (((GObjectClass *) (parent_class))->dispose) {
-        (* ((GObjectClass *) (parent_class))->dispose) (object);
+    if ((G_OBJECT_CLASS(parent_class))->dispose) {
+        (* (G_OBJECT_CLASS(parent_class))->dispose) (object);
     }
 }
 
@@ -267,7 +267,7 @@ GtkWidget *sp_gradient_selector_new()
 {
     SPGradientSelector *sel = SP_GRADIENT_SELECTOR(g_object_new (SP_TYPE_GRADIENT_SELECTOR, NULL));
 
-    return (GtkWidget *) sel;
+    return GTK_WIDGET(sel);
 }
 
 void SPGradientSelector::setMode(SelectorMode mode)
diff --git a/src/widgets/gradient-vector.cpp b/src/widgets/gradient-vector.cpp
index 51013a2cd..3a95b552a 100644
--- a/src/widgets/gradient-vector.cpp
+++ b/src/widgets/gradient-vector.cpp
@@ -609,7 +609,7 @@ static void update_stop_list( GtkWidget *vb, SPGradient *gradient, SPStop *new_s
     if (!combo_box) {
         return;
     }
-    GtkListStore *store = (GtkListStore *)gtk_combo_box_get_model (GTK_COMBO_BOX(combo_box));
+    GtkListStore *store = GTK_LIST_STORE(gtk_combo_box_get_model(GTK_COMBO_BOX(combo_box)));
     if (!store) {
         return;
     }
@@ -720,7 +720,7 @@ static SPStop *get_selected_stop( GtkWidget *vb)
     if (combo_box) {
         GtkTreeIter  iter;
         if (gtk_combo_box_get_active_iter (GTK_COMBO_BOX(combo_box), &iter)) {
-            GtkListStore *store = (GtkListStore *)gtk_combo_box_get_model (GTK_COMBO_BOX(combo_box));
+            GtkListStore *store = GTK_LIST_STORE(gtk_combo_box_get_model(GTK_COMBO_BOX(combo_box)));
             gtk_tree_model_get (GTK_TREE_MODEL(store), &iter, 2, &stop, -1);
         }
     }
@@ -931,7 +931,7 @@ static GtkWidget * sp_gradient_vector_widget_new(SPGradient *gradient, SPStop *s
 
     /* Adjustment */
     GtkAdjustment *Offset_adj = NULL;
-    Offset_adj= (GtkAdjustment *) gtk_adjustment_new(0.0, 0.0, 1.0, 0.01, 0.01, 0.0);
+    Offset_adj= GTK_ADJUSTMENT(gtk_adjustment_new(0.0, 0.0, 1.0, 0.01, 0.01, 0.0));
     g_object_set_data(G_OBJECT(vb), "offset", Offset_adj);
 
     SPStop *stop = get_selected_stop(vb);
@@ -1197,10 +1197,10 @@ static void sp_gradient_vector_widget_destroy(GtkWidget *object, gpointer /*data
 static void sp_gradient_vector_widget_destroy(GtkObject *object, gpointer /*data*/)
 #endif
 {
-    SPObject *gradient = reinterpret_cast<SPObject*>(g_object_get_data(G_OBJECT(object), "gradient"));
+    SPObject *gradient = SP_OBJECT(g_object_get_data(G_OBJECT(object), "gradient"));
 
-    sigc::connection *release_connection = (sigc::connection *)g_object_get_data(G_OBJECT(object), "gradient_release_connection");
-    sigc::connection *modified_connection = (sigc::connection *)g_object_get_data(G_OBJECT(object), "gradient_modified_connection");
+    sigc::connection *release_connection = static_cast<sigc::connection *>(g_object_get_data(G_OBJECT(object), "gradient_release_connection"));
+    sigc::connection *modified_connection = static_cast<sigc::connection *>(g_object_get_data(G_OBJECT(object), "gradient_modified_connection"));
 
     if (gradient) {
         g_assert( release_connection != NULL );
@@ -1316,7 +1316,7 @@ static void sp_gradient_vector_color_changed(SPColorSelector *csel, GObject *obj
     if (combo_box) {
         GtkTreeIter  iter;
         if (gtk_combo_box_get_active_iter (GTK_COMBO_BOX(combo_box), &iter)) {
-            GtkListStore *store = (GtkListStore *)gtk_combo_box_get_model (GTK_COMBO_BOX(combo_box));
+            GtkListStore *store = GTK_LIST_STORE(gtk_combo_box_get_model(GTK_COMBO_BOX(combo_box)));
 
             Inkscape::UI::Widget::ColorPreview *cp = Gtk::manage(new Inkscape::UI::Widget::ColorPreview(sp_stop_get_rgba32(stop)));
             GdkPixbuf *pb = cp->toPixbuf(64, 16);
diff --git a/src/widgets/icon.cpp b/src/widgets/icon.cpp
index d3b7e2dbb..ff443504d 100644
--- a/src/widgets/icon.cpp
+++ b/src/widgets/icon.cpp
@@ -164,13 +164,10 @@ GType SPIcon::getType()
 
 void IconImpl::classInit(SPIconClass *klass)
 {
-    GObjectClass *object_class;
-    GtkWidgetClass *widget_class;
+    GObjectClass   *object_class = G_OBJECT_CLASS(klass);
+    GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
 
-    object_class = (GObjectClass *) klass;
-    widget_class = (GtkWidgetClass *) klass;
-
-    parent_class = (GtkWidgetClass*)g_type_class_peek_parent(klass);
+    parent_class = GTK_WIDGET_CLASS(g_type_class_peek_parent(klass));
 
     object_class->dispose = IconImpl::dispose;
 
@@ -205,7 +202,7 @@ void IconImpl::dispose(GObject *object)
         icon->name = 0;
     }
 
-    ((GObjectClass *) (parent_class))->dispose(object);
+    (G_OBJECT_CLASS(parent_class))->dispose(object);
 }
 
 void IconImpl::reset( SPIcon *icon )
@@ -865,7 +862,7 @@ GtkWidget *IconImpl::newFull( Inkscape::IconSize lsize, gchar const *name )
             if ( dump ) {
                 g_message( "skipped gtk '%s' %d  (not GTK_IMAGE_STOCK)", name, lsize );
             }
-            //g_object_unref( (GObject *)img );
+            //g_object_unref(G_OBJECT(img));
             img = 0;
         }
     }
@@ -1022,7 +1019,7 @@ int IconImpl::getPhysSize(int size)
             "inkscape-decoration"
         };
 
-        GtkWidget *icon = (GtkWidget *)g_object_new(SP_TYPE_ICON, NULL);
+        GtkWidget *icon = GTK_WIDGET(g_object_new(SP_TYPE_ICON, NULL));
 
         for (unsigned i = 0; i < G_N_ELEMENTS(gtkSizes); ++i) {
             guint const val_ix = (gtkSizes[i] <= GTK_ICON_SIZE_DIALOG) ? (guint)gtkSizes[i] : (guint)Inkscape::ICON_SIZE_DECORATION;
@@ -1075,7 +1072,7 @@ int IconImpl::getPhysSize(int size)
 
 GdkPixbuf *IconImpl::loadPixmap(gchar const *name, unsigned /*lsize*/, unsigned psize)
 {
-    gchar *path = (gchar *) g_strdup_printf("%s/%s.png", INKSCAPE_PIXMAPDIR, name);
+    gchar *path = g_strdup_printf("%s/%s.png", INKSCAPE_PIXMAPDIR, name);
     // TODO: bulia, please look over
     gsize bytesRead = 0;
     gsize bytesWritten = 0;
@@ -1089,7 +1086,7 @@ GdkPixbuf *IconImpl::loadPixmap(gchar const *name, unsigned /*lsize*/, unsigned
     g_free(localFilename);
     g_free(path);
     if (!pb) {
-        path = (gchar *) g_strdup_printf("%s/%s.xpm", INKSCAPE_PIXMAPDIR, name);
+        path = g_strdup_printf("%s/%s.xpm", INKSCAPE_PIXMAPDIR, name);
         // TODO: bulia, please look over
         gsize bytesRead = 0;
         gsize bytesWritten = 0;
diff --git a/src/widgets/paint-selector.cpp b/src/widgets/paint-selector.cpp
index 5a6e774f5..b0738b6a6 100644
--- a/src/widgets/paint-selector.cpp
+++ b/src/widgets/paint-selector.cpp
@@ -157,9 +157,9 @@ GType sp_paint_selector_get_type(void)
 static void
 sp_paint_selector_class_init(SPPaintSelectorClass *klass)
 {
-    GObjectClass *object_class = (GObjectClass *) klass;
+    GObjectClass *object_class = G_OBJECT_CLASS(klass);
 
-    parent_class = (GtkVBoxClass*)g_type_class_peek_parent(klass);
+    parent_class = GTK_VBOX_CLASS(g_type_class_peek_parent(klass));
 
     psel_signals[MODE_CHANGED] = g_signal_new("mode_changed",
                                                 G_TYPE_FROM_CLASS(object_class),
@@ -311,8 +311,8 @@ static void sp_paint_selector_dispose(GObject *object)
     // clean up our long-living pattern menu
     g_object_set_data(G_OBJECT(psel),"patternmenu",NULL);
 
-    if (((GObjectClass *) parent_class)->dispose)
-        (* ((GObjectClass *) parent_class)->dispose)(object);
+    if ((G_OBJECT_CLASS(parent_class))->dispose)
+        (* (G_OBJECT_CLASS(parent_class))->dispose)(object);
 }
 
 static GtkWidget *sp_paint_selector_style_button_add(SPPaintSelector *psel,
@@ -655,7 +655,7 @@ static void sp_paint_selector_set_mode_color(SPPaintSelector *psel, SPPaintSelec
 
     if ((psel->mode == SPPaintSelector::MODE_COLOR_RGB) || (psel->mode == SPPaintSelector::MODE_COLOR_CMYK)) {
         /* Already have color selector */
-        csel = (GtkWidget*)g_object_get_data(G_OBJECT(psel->selector), "color-selector");
+        csel = GTK_WIDGET(g_object_get_data(G_OBJECT(psel->selector), "color-selector"));
     } else {
 
         sp_paint_selector_clear_frame(psel);
@@ -732,7 +732,7 @@ static void sp_paint_selector_set_mode_gradient(SPPaintSelector *psel, SPPaintSe
 
     if ((psel->mode == SPPaintSelector::MODE_GRADIENT_LINEAR) || (psel->mode == SPPaintSelector::MODE_GRADIENT_RADIAL)) {
         /* Already have gradient selector */
-        gsel = (GtkWidget*)g_object_get_data(G_OBJECT(psel->selector), "gradient-selector");
+        gsel = GTK_WIDGET(g_object_get_data(G_OBJECT(psel->selector), "gradient-selector"));
     } else {
         sp_paint_selector_clear_frame(psel);
         /* Create new gradient selector */
@@ -799,7 +799,7 @@ ink_pattern_list_get (SPDocument *source)
 
     GSList *pl = NULL;
     GSList const *patterns = source->getResourceList("pattern");
-    for (GSList *l = (GSList *) patterns; l != NULL; l = l->next) {
+    for (GSList *l = const_cast<GSList *>(patterns); l != NULL; l = l->next) {
         if (SP_PATTERN(l->data) == pattern_getroot(SP_PATTERN(l->data))) {  // only if this is a root pattern
             pl = g_slist_prepend(pl, l->data);
         }
@@ -995,7 +995,7 @@ static void sp_paint_selector_set_mode_pattern(SPPaintSelector *psel, SPPaintSel
 
     if (psel->mode == SPPaintSelector::MODE_PATTERN) {
         /* Already have pattern menu */
-        tbl = (GtkWidget*)g_object_get_data(G_OBJECT(psel->selector), "pattern-selector");
+        tbl = GTK_WIDGET(g_object_get_data(G_OBJECT(psel->selector), "pattern-selector"));
     } else {
         sp_paint_selector_clear_frame(psel);
 
@@ -1081,7 +1081,7 @@ SPPattern *SPPaintSelector::getPattern()
     SPPattern *pat = 0;
     g_return_val_if_fail((mode == MODE_PATTERN) , NULL);
 
-    GtkWidget *combo = (GtkWidget *) g_object_get_data(G_OBJECT(this), "patternmenu");
+    GtkWidget *combo = GTK_WIDGET(g_object_get_data(G_OBJECT(this), "patternmenu"));
 
     /* no pattern menu if we were just selected */
     if ( combo == NULL ) {
diff --git a/src/widgets/pencil-toolbar.cpp b/src/widgets/pencil-toolbar.cpp
index d0e71d2b0..87942f141 100644
--- a/src/widgets/pencil-toolbar.cpp
+++ b/src/widgets/pencil-toolbar.cpp
@@ -242,7 +242,7 @@ static void sp_pencil_tb_defaults(GtkWidget * /*widget*/, GObject *obj)
     // fixme: make settable
     gdouble tolerance = 4;
 
-    adj = (GtkAdjustment*)g_object_get_data(obj, "tolerance");
+    adj = GTK_ADJUSTMENT(g_object_get_data(obj, "tolerance"));
     gtk_adjustment_set_value(adj, tolerance);
     gtk_adjustment_value_changed(adj);
 
@@ -282,7 +282,7 @@ public:
         }
         g_object_set_data( tbl, "freeze", GINT_TO_POINTER(TRUE) );
 
-        GtkAdjustment * adj = (GtkAdjustment*)g_object_get_data(tbl, "tolerance");
+        GtkAdjustment * adj = GTK_ADJUSTMENT(g_object_get_data(tbl, "tolerance"));
 
         double v = val.getDouble(adj->value);
         gtk_adjustment_set_value(adj, v);
diff --git a/src/widgets/select-toolbar.cpp b/src/widgets/select-toolbar.cpp
index 3ccfa9cf9..549581610 100644
--- a/src/widgets/select-toolbar.cpp
+++ b/src/widgets/select-toolbar.cpp
@@ -88,13 +88,13 @@ sp_selection_layout_widget_update(SPWidget *spw, Inkscape::Selection *sel)
             if (unit.base == SP_UNIT_DIMENSIONLESS) {
                 double const val = 1. / unit.unittobase;
                 for (unsigned i = 0; i < G_N_ELEMENTS(keyval); ++i) {
-                    GtkAdjustment *a = (GtkAdjustment *) g_object_get_data(G_OBJECT(spw), keyval[i].key);
+                    GtkAdjustment *a = GTK_ADJUSTMENT(g_object_get_data(G_OBJECT(spw), keyval[i].key));
                     gtk_adjustment_set_value(a, val);
                     tracker->setFullVal( a, keyval[i].val );
                 }
             } else {
                 for (unsigned i = 0; i < G_N_ELEMENTS(keyval); ++i) {
-                    GtkAdjustment *a = (GtkAdjustment *) g_object_get_data(G_OBJECT(spw), keyval[i].key);
+                    GtkAdjustment *a = GTK_ADJUSTMENT(g_object_get_data(G_OBJECT(spw), keyval[i].key));
                     gtk_adjustment_set_value(a, sp_pixels_get_units(keyval[i].val, unit));
                 }
             }
diff --git a/src/widgets/sp-color-icc-selector.cpp b/src/widgets/sp-color-icc-selector.cpp
index 80974c2e4..d89d35e9c 100644
--- a/src/widgets/sp-color-icc-selector.cpp
+++ b/src/widgets/sp-color-icc-selector.cpp
@@ -104,12 +104,9 @@ sp_color_icc_selector_get_type (void)
 static void sp_color_icc_selector_class_init(SPColorICCSelectorClass *klass)
 {
     static const gchar* nameset[] = {N_("CMS"), 0};
-    GObjectClass *object_class = (GObjectClass *) klass;
-    GtkWidgetClass *widget_class;
-    SPColorSelectorClass *selector_class;
-
-    widget_class = (GtkWidgetClass *) klass;
-    selector_class = SP_COLOR_SELECTOR_CLASS (klass);
+    GObjectClass   *object_class = G_OBJECT_CLASS(klass);
+    GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
+    SPColorSelectorClass *selector_class = SP_COLOR_SELECTOR_CLASS (klass);
 
     parent_class = SP_COLOR_SELECTOR_CLASS (g_type_class_peek_parent (klass));
 
@@ -453,7 +450,7 @@ void ColorICCSelector::init()
 #endif
 
     /* Adjustment */
-    _adj = (GtkAdjustment *) gtk_adjustment_new (0.0, 0.0, 255.0, 1.0, 10.0, 10.0);
+    _adj = GTK_ADJUSTMENT(gtk_adjustment_new(0.0, 0.0, 255.0, 1.0, 10.0, 10.0));
 
     /* Slider */
     _slider = sp_color_slider_new (_adj);
@@ -510,8 +507,8 @@ void ColorICCSelector::init()
 
 static void sp_color_icc_selector_dispose(GObject *object)
 {
-    if (((GObjectClass *) (parent_class))->dispose)
-        (* ((GObjectClass *) (parent_class))->dispose)(object);
+    if ((G_OBJECT_CLASS(parent_class))->dispose)
+        (* (G_OBJECT_CLASS(parent_class))->dispose)(object);
 }
 
 static void
@@ -672,7 +669,7 @@ void ColorICCSelector::_profilesChanged( std::string const & name )
 
     g_signal_handler_block( G_OBJECT(_profileSel), _profChangedID );
 
-    GtkListStore *store = (GtkListStore *)gtk_combo_box_get_model (combo);
+    GtkListStore *store = GTK_LIST_STORE(gtk_combo_box_get_model(combo));
     gtk_list_store_clear(store);
 
     GtkTreeIter iter;
@@ -1008,7 +1005,7 @@ void ColorICCSelector::_adjustmentChanged( GtkAdjustment *adjustment, SPColorICC
 
 void ColorICCSelector::_sliderGrabbed( SPColorSlider */*slider*/, SPColorICCSelector */*cs*/ )
 {
-//    ColorICCSelector* iccSelector = (ColorICCSelector*)(SP_COLOR_SELECTOR(cs)->base);
+//    ColorICCSelector* iccSelector = dynamic_cast<ColorICCSelector*>(SP_COLOR_SELECTOR(cs)->base);
 //     if (!iccSelector->_dragging) {
 //         iccSelector->_dragging = TRUE;
 //         iccSelector->_grabbed();
@@ -1018,7 +1015,7 @@ void ColorICCSelector::_sliderGrabbed( SPColorSlider */*slider*/, SPColorICCSele
 
 void ColorICCSelector::_sliderReleased( SPColorSlider */*slider*/, SPColorICCSelector */*cs*/ )
 {
-//     ColorICCSelector* iccSelector = (ColorICCSelector*)(SP_COLOR_SELECTOR(cs)->base);
+//     ColorICCSelector* iccSelector = dynamic_cast<ColorICCSelector*>(SP_COLOR_SELECTOR(cs)->base);
 //     if (iccSelector->_dragging) {
 //         iccSelector->_dragging = FALSE;
 //         iccSelector->_released();
@@ -1035,7 +1032,7 @@ void ColorICCSelector::_sliderChanged( SPColorSlider */*slider*/, SPColorICCSele
 #ifdef DEBUG_LCMS
     g_message("Changed  %p and %p", slider, cs );
 #endif // DEBUG_LCMS
-//     ColorICCSelector* iccSelector = (ColorICCSelector*)(SP_COLOR_SELECTOR(cs)->base);
+//     ColorICCSelector* iccSelector = dynamic_cast<ColorICCSelector*>(SP_COLOR_SELECTOR(cs)->base);
 
 //     iccSelector->_updateInternals( iccSelector->_color, ColorScales::getScaled( iccSelector->_adj ), iccSelector->_dragging );
 }
diff --git a/src/widgets/sp-color-scales.cpp b/src/widgets/sp-color-scales.cpp
index 95c6d341d..8fc3a9e44 100644
--- a/src/widgets/sp-color-scales.cpp
+++ b/src/widgets/sp-color-scales.cpp
@@ -78,12 +78,9 @@ static void
 sp_color_scales_class_init (SPColorScalesClass *klass)
 {
 	static const gchar* nameset[] = {N_("RGB"), N_("HSL"), N_("CMYK"), 0};
-	GObjectClass *object_class = (GObjectClass *) klass;
-	GtkWidgetClass *widget_class;
-	SPColorSelectorClass *selector_class;
-
-	widget_class = (GtkWidgetClass *) klass;
-	selector_class = SP_COLOR_SELECTOR_CLASS (klass);
+	GObjectClass *object_class = G_OBJECT_CLASS(klass);
+	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
+	SPColorSelectorClass *selector_class = SP_COLOR_SELECTOR_CLASS (klass);
 
 	parent_class = SP_COLOR_SELECTOR_CLASS (g_type_class_peek_parent (klass));
 
@@ -164,7 +161,7 @@ void ColorScales::init()
 #endif
 
 		/* Adjustment */
-		_a[i] = (GtkAdjustment *) gtk_adjustment_new (0.0, 0.0, _rangeLimit, 1.0, 10.0, 10.0);
+		_a[i] = GTK_ADJUSTMENT(gtk_adjustment_new(0.0, 0.0, _rangeLimit, 1.0, 10.0, 10.0));
 		/* Slider */
 		_s[i] = sp_color_slider_new (_a[i]);
 		gtk_widget_show (_s[i]);
@@ -217,8 +214,8 @@ void ColorScales::init()
 
 static void sp_color_scales_dispose(GObject *object)
 {
-	if (((GObjectClass *) (parent_class))->dispose)
-		(* ((GObjectClass *) (parent_class))->dispose) (object);
+	if ((G_OBJECT_CLASS(parent_class))->dispose)
+		(* (G_OBJECT_CLASS(parent_class))->dispose) (object);
 }
 
 static void
@@ -466,7 +463,7 @@ void ColorScales::setMode(SPColorScalesMode mode)
 		gtk_label_set_markup_with_mnemonic (GTK_LABEL (_l[3]), _("_A:"));
 		gtk_widget_set_tooltip_text (_s[3], _("Alpha (opacity)"));
 		gtk_widget_set_tooltip_text (_b[3], _("Alpha (opacity)"));
-		sp_color_slider_set_map (SP_COLOR_SLIDER (_s[0]), (guchar*)sp_color_scales_hue_map ());
+		sp_color_slider_set_map (SP_COLOR_SLIDER (_s[0]), reinterpret_cast<guchar*>(g_strdup(sp_color_scales_hue_map())));
 		gtk_widget_hide (_l[4]);
 		gtk_widget_hide (_s[4]);
 		gtk_widget_hide (_b[4]);
diff --git a/src/widgets/sp-color-slider.cpp b/src/widgets/sp-color-slider.cpp
index 3ba748f2b..a16425548 100644
--- a/src/widgets/sp-color-slider.cpp
+++ b/src/widgets/sp-color-slider.cpp
@@ -86,12 +86,10 @@ sp_color_slider_get_type (void)
 
 static void sp_color_slider_class_init(SPColorSliderClass *klass)
 {
-	GObjectClass *object_class = (GObjectClass *) klass;
-	GtkWidgetClass *widget_class;
+	GObjectClass   *object_class = G_OBJECT_CLASS(klass);
+	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
 
-	widget_class = (GtkWidgetClass *) klass;
-
-	parent_class = (GtkWidgetClass*)g_type_class_peek_parent (klass);
+	parent_class = GTK_WIDGET_CLASS(g_type_class_peek_parent(klass));
 
 	slider_signals[GRABBED] = g_signal_new ("grabbed",
 						  G_TYPE_FROM_CLASS(object_class),
@@ -185,8 +183,8 @@ static void sp_color_slider_dispose(GObject *object)
 		slider->adjustment = NULL;
 	}
 
-	if (((GObjectClass *) (parent_class))->dispose)
-		(* ((GObjectClass *) (parent_class))->dispose) (object);
+	if ((G_OBJECT_CLASS(parent_class))->dispose)
+		(* (G_OBJECT_CLASS(parent_class))->dispose) (object);
 }
 
 static void
@@ -311,17 +309,16 @@ sp_color_slider_button_press (GtkWidget *widget, GdkEventButton *event)
 		g_signal_emit (G_OBJECT (slider), slider_signals[DRAGGED], 0);
 
 #if GTK_CHECK_VERSION(3,0,0)
-		gdk_device_grab(gdk_event_get_device((GdkEvent*)event),
+		gdk_device_grab(gdk_event_get_device(GDK_EVENT(event)),
 				gtk_widget_get_window(widget), 
 				GDK_OWNERSHIP_NONE,
 				FALSE,
-				(GdkEventMask)(GDK_POINTER_MOTION_MASK | GDK_BUTTON_RELEASE_MASK),
+				static_cast<GdkEventMask>(GDK_POINTER_MOTION_MASK | GDK_BUTTON_RELEASE_MASK),
 				NULL,
 				event->time);
 #else		
 		gdk_pointer_grab(gtk_widget_get_window(widget), FALSE,
-				  (GdkEventMask)(GDK_POINTER_MOTION_MASK |
-				  GDK_BUTTON_RELEASE_MASK),
+				  static_cast<GdkEventMask>(GDK_POINTER_MOTION_MASK | GDK_BUTTON_RELEASE_MASK),
 				  NULL, NULL, event->time);
 #endif
 	}
@@ -339,8 +336,8 @@ sp_color_slider_button_release (GtkWidget *widget, GdkEventButton *event)
 	if (event->button == 1) {
 
 #if GTK_CHECK_VERSION(3,0,0)
-		gdk_device_ungrab(gdk_event_get_device((GdkEvent *)event),
-                                  gdk_event_get_time((GdkEvent *)event));
+		gdk_device_ungrab(gdk_event_get_device(GDK_EVENT(event)),
+                                  gdk_event_get_time(GDK_EVENT(event)));
 #else
 		gdk_pointer_ungrab (event->time);
 #endif
@@ -388,7 +385,7 @@ void sp_color_slider_set_adjustment(SPColorSlider *slider, GtkAdjustment *adjust
     g_return_if_fail (SP_IS_COLOR_SLIDER (slider));
 
     if (!adjustment) {
-        adjustment = (GtkAdjustment *) gtk_adjustment_new (0.0, 0.0, 1.0, 0.01, 0.0, 0.0);
+        adjustment = GTK_ADJUSTMENT(gtk_adjustment_new(0.0, 0.0, 1.0, 0.01, 0.0, 0.0));
     } else {
         gtk_adjustment_set_page_increment(adjustment, 0.0);
         gtk_adjustment_set_page_size(adjustment, 0.0);
@@ -448,7 +445,7 @@ sp_color_slider_set_map (SPColorSlider *slider, const guchar *map)
 	g_return_if_fail (slider != NULL);
 	g_return_if_fail (SP_IS_COLOR_SLIDER (slider));
 
-	slider->map = (guchar *) map;
+	slider->map = const_cast<guchar *>(map);
 
 	gtk_widget_queue_draw (GTK_WIDGET (slider));
 }
diff --git a/src/widgets/sp-color-wheel-selector.cpp b/src/widgets/sp-color-wheel-selector.cpp
index a979a168a..3e91274d2 100644
--- a/src/widgets/sp-color-wheel-selector.cpp
+++ b/src/widgets/sp-color-wheel-selector.cpp
@@ -56,12 +56,9 @@ sp_color_wheel_selector_get_type (void)
 static void sp_color_wheel_selector_class_init(SPColorWheelSelectorClass *klass)
 {
     static const gchar* nameset[] = {N_("Wheel"), 0};
-    GObjectClass *object_class = (GObjectClass *) klass;
-    GtkWidgetClass *widget_class;
-    SPColorSelectorClass *selector_class;
-
-    widget_class = (GtkWidgetClass *) klass;
-    selector_class = SP_COLOR_SELECTOR_CLASS (klass);
+    GObjectClass   *object_class = G_OBJECT_CLASS(klass);
+    GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
+    SPColorSelectorClass *selector_class = SP_COLOR_SELECTOR_CLASS (klass);
 
     parent_class = SP_COLOR_SELECTOR_CLASS (g_type_class_peek_parent (klass));
 
@@ -197,7 +194,7 @@ void ColorWheelSelector::init()
 #endif
 
     /* Adjustment */
-    _adj = (GtkAdjustment *) gtk_adjustment_new (0.0, 0.0, 255.0, 1.0, 10.0, 10.0);
+    _adj = GTK_ADJUSTMENT(gtk_adjustment_new(0.0, 0.0, 255.0, 1.0, 10.0, 10.0));
 
     /* Slider */
     _slider = sp_color_slider_new (_adj);
@@ -266,8 +263,8 @@ void ColorWheelSelector::init()
 
 static void sp_color_wheel_selector_dispose(GObject *object)
 {
-    if (((GObjectClass *) (parent_class))->dispose)
-        (* ((GObjectClass *) (parent_class))->dispose) (object);
+    if ((G_OBJECT_CLASS(parent_class))->dispose)
+        (* (G_OBJECT_CLASS(parent_class))->dispose) (object);
 }
 
 static void
diff --git a/src/widgets/sp-widget.cpp b/src/widgets/sp-widget.cpp
index 8d840da25..7876f0454 100644
--- a/src/widgets/sp-widget.cpp
+++ b/src/widgets/sp-widget.cpp
@@ -306,7 +306,7 @@ GtkWidget *SPWidgetImpl::constructGlobal(SPWidget *spw, Inkscape::Application *i
 
     g_signal_emit(spw, signals[CONSTRUCT], 0);
 
-    return (GtkWidget *) spw;
+    return GTK_WIDGET(spw);
 }
 
 void SPWidgetImpl::modifySelectionCB(Application *inkscape, Selection *selection, guint flags, SPWidget *spw)
diff --git a/src/widgets/sp-xmlview-attr-list.cpp b/src/widgets/sp-xmlview-attr-list.cpp
index 1fd120d17..47b0ebb9d 100644
--- a/src/widgets/sp-xmlview-attr-list.cpp
+++ b/src/widgets/sp-xmlview-attr-list.cpp
@@ -68,7 +68,7 @@ GtkWidget *sp_xmlview_attr_list_new (Inkscape::XML::Node * repr)
 
     sp_xmlview_attr_list_set_repr (attr_list, repr);
 
-    return (GtkWidget *) attr_list;
+    return GTK_WIDGET(attr_list);
 }
 
 void
@@ -114,14 +114,14 @@ GType sp_xmlview_attr_list_get_type(void)
 void sp_xmlview_attr_list_class_init (SPXMLViewAttrListClass * klass)
 {
 #if GTK_CHECK_VERSION(3,0,0)
-	GtkWidgetClass * widget_class = (GtkWidgetClass *) klass;
+	GtkWidgetClass * widget_class = GTK_WIDGET_CLASS(klass);
 	widget_class->destroy = sp_xmlview_attr_list_destroy;
 #else
-	GtkObjectClass * object_class = (GtkObjectClass *) klass;
+	GtkObjectClass * object_class = GTK_OBJECT_CLASS(klass);
 	object_class->destroy = sp_xmlview_attr_list_destroy;
 #endif
 
-	parent_class = (GtkTreeViewClass*)g_type_class_peek_parent (klass);
+	parent_class = GTK_TREE_VIEW_CLASS(g_type_class_peek_parent (klass));
 
         g_signal_new("row-value-changed",
                       G_TYPE_FROM_CLASS(klass),
diff --git a/src/widgets/sp-xmlview-content.cpp b/src/widgets/sp-xmlview-content.cpp
index d31e031c2..ac64dabdb 100644
--- a/src/widgets/sp-xmlview-content.cpp
+++ b/src/widgets/sp-xmlview-content.cpp
@@ -59,7 +59,7 @@ GtkWidget *sp_xmlview_content_new(Inkscape::XML::Node * repr)
 
     sp_xmlview_content_set_repr (text, repr);
 
-    return (GtkWidget *) text;
+    return GTK_WIDGET(text);
 }
 
 void
@@ -107,14 +107,14 @@ GType sp_xmlview_content_get_type(void)
 void sp_xmlview_content_class_init(SPXMLViewContentClass * klass)
 {
 #if GTK_CHECK_VERSION(3,0,0)
-    GtkWidgetClass * widget_class = (GtkWidgetClass *) klass;
+    GtkWidgetClass * widget_class = GTK_WIDGET_CLASS(klass);
     widget_class->destroy = sp_xmlview_content_destroy;
 #else
-    GtkObjectClass * object_class = (GtkObjectClass *) klass;
+    GtkObjectClass * object_class = GTK_OBJECT_CLASS(klass);
     object_class->destroy = sp_xmlview_content_destroy;
 #endif
 
-    parent_class = (GtkTextViewClass*)g_type_class_peek_parent (klass);
+    parent_class = GTK_TEXT_VIEW_CLASS(g_type_class_peek_parent (klass));
 }
 
 void
diff --git a/src/widgets/sp-xmlview-tree.cpp b/src/widgets/sp-xmlview-tree.cpp
index 258cea0b4..bc6031c1e 100644
--- a/src/widgets/sp-xmlview-tree.cpp
+++ b/src/widgets/sp-xmlview-tree.cpp
@@ -122,7 +122,7 @@ GtkWidget *sp_xmlview_tree_new(Inkscape::XML::Node * repr, void * /*factory*/, v
     g_signal_connect(GTK_TREE_VIEW(tree), "drag_data_received",  G_CALLBACK(on_drag_data_received), tree);
     g_signal_connect(GTK_TREE_VIEW(tree), "drag-motion",  G_CALLBACK(do_drag_motion), tree);
 
-    return (GtkWidget *) tree;
+    return GTK_WIDGET(tree);
 }
 
 GType
@@ -151,14 +151,14 @@ sp_xmlview_tree_get_type (void)
 void sp_xmlview_tree_class_init(SPXMLViewTreeClass * klass)
 {
 #if GTK_CHECK_VERSION(3,0,0)
-    GtkWidgetClass * widget_class = (GtkWidgetClass *) klass;
+    GtkWidgetClass * widget_class = GTK_WIDGET_CLASS(klass);
     widget_class->destroy = sp_xmlview_tree_destroy;
 #else
-    GtkObjectClass * object_class = (GtkObjectClass *) klass;
+    GtkObjectClass * object_class = GTK_OBJECT_CLASS(klass);
     object_class->destroy = sp_xmlview_tree_destroy;
 #endif
     
-    parent_class = (GtkTreeViewClass *) g_type_class_peek_parent (klass);
+    parent_class = GTK_TREE_VIEW_CLASS(g_type_class_peek_parent (klass));
 
     // Signal for when a tree drag and drop has completed
     g_signal_new (  "tree_move",
@@ -441,7 +441,7 @@ void on_row_changed(GtkTreeModel *tree_model, GtkTreePath *path, GtkTreeIter *it
         return;
     }
 
-    GtkTreeRowReference  *old_parent_ref = (GtkTreeRowReference *)g_object_get_data (G_OBJECT (tree), "drag-src-path");
+    GtkTreeRowReference  *old_parent_ref = static_cast<GtkTreeRowReference *>(g_object_get_data (G_OBJECT (tree), "drag-src-path"));
     if (!old_parent_ref) {
         //No drag source location
         g_signal_emit_by_name(G_OBJECT (tree), "tree_move", GUINT_TO_POINTER(0) );
diff --git a/src/widgets/spinbutton-events.cpp b/src/widgets/spinbutton-events.cpp
index 1d44b9190..96d746468 100644
--- a/src/widgets/spinbutton-events.cpp
+++ b/src/widgets/spinbutton-events.cpp
@@ -23,11 +23,9 @@
 #include "spinbutton-events.h"
 
 gboolean
-spinbutton_focus_in (GtkWidget *w, GdkEventKey */*event*/, gpointer /*data*/)
+spinbutton_focus_in (GtkWidget *w, GdkEventKey * /*event*/, gpointer /*data*/)
 {
-	gdouble *ini;
-
-	ini = (gdouble *) g_object_get_data(G_OBJECT (w), "ini");
+	gdouble *ini = static_cast<gdouble *>(g_object_get_data(G_OBJECT(w), "ini"));
 	if (ini) g_free (ini); // free the old value if any
 
 	// retrieve the value
@@ -43,7 +41,7 @@ spinbutton_focus_in (GtkWidget *w, GdkEventKey */*event*/, gpointer /*data*/)
 void
 spinbutton_undo (GtkWidget *w)
 {
-	gdouble *ini = (gdouble *) g_object_get_data(G_OBJECT (w), "ini");
+	gdouble *ini = static_cast<gdouble *>(g_object_get_data(G_OBJECT (w), "ini"));
 	if (ini) {
 	    gtk_spin_button_set_value(GTK_SPIN_BUTTON(w), *ini);
 	}
@@ -57,7 +55,7 @@ spinbutton_defocus (GtkWidget *container)
 	if (stay) {
 		g_object_set_data (G_OBJECT (container), "stay", GINT_TO_POINTER (FALSE));
 	} else {
-		GtkWidget *canvas = (GtkWidget *) g_object_get_data(G_OBJECT (container), "dtw");
+		GtkWidget *canvas = GTK_WIDGET(g_object_get_data(G_OBJECT (container), "dtw"));
 		if (canvas) {
 			gtk_widget_grab_focus (GTK_WIDGET(canvas));
 		}
diff --git a/src/widgets/spiral-toolbar.cpp b/src/widgets/spiral-toolbar.cpp
index c51c8b6cf..b493ca5bf 100644
--- a/src/widgets/spiral-toolbar.cpp
+++ b/src/widgets/spiral-toolbar.cpp
@@ -147,15 +147,15 @@ static void sp_spl_tb_defaults(GtkWidget * /*widget*/, GObject *obj)
     gdouble exp = 1.0;
     gdouble t0 = 0.0;
 
-    adj = (GtkAdjustment*)g_object_get_data(obj, "revolution");
+    adj = GTK_ADJUSTMENT(g_object_get_data(obj, "revolution"));
     gtk_adjustment_set_value(adj, rev);
     gtk_adjustment_value_changed(adj);
 
-    adj = (GtkAdjustment*)g_object_get_data(obj, "expansion");
+    adj = GTK_ADJUSTMENT(g_object_get_data(obj, "expansion"));
     gtk_adjustment_set_value(adj, exp);
     gtk_adjustment_value_changed(adj);
 
-    adj = (GtkAdjustment*)g_object_get_data(obj, "t0");
+    adj = GTK_ADJUSTMENT(g_object_get_data(obj, "t0"));
     gtk_adjustment_set_value(adj, t0);
     gtk_adjustment_value_changed(adj);
 
@@ -181,17 +181,17 @@ static void spiral_tb_event_attr_changed(Inkscape::XML::Node *repr,
     g_object_set_data(G_OBJECT(tbl), "freeze", GINT_TO_POINTER(TRUE));
 
     GtkAdjustment *adj;
-    adj = (GtkAdjustment*)g_object_get_data(G_OBJECT(tbl), "revolution");
+    adj = GTK_ADJUSTMENT(g_object_get_data(G_OBJECT(tbl), "revolution"));
     double revolution = 3.0;
     sp_repr_get_double(repr, "sodipodi:revolution", &revolution);
     gtk_adjustment_set_value(adj, revolution);
 
-    adj = (GtkAdjustment*)g_object_get_data(G_OBJECT(tbl), "expansion");
+    adj = GTK_ADJUSTMENT(g_object_get_data(G_OBJECT(tbl), "expansion"));
     double expansion = 1.0;
     sp_repr_get_double(repr, "sodipodi:expansion", &expansion);
     gtk_adjustment_set_value(adj, expansion);
 
-    adj = (GtkAdjustment*)g_object_get_data(G_OBJECT(tbl), "t0");
+    adj = GTK_ADJUSTMENT(g_object_get_data(G_OBJECT(tbl), "t0"));
     double t0 = 0.0;
     sp_repr_get_double(repr, "sodipodi:t0", &t0);
     gtk_adjustment_set_value(adj, t0);
diff --git a/src/widgets/star-toolbar.cpp b/src/widgets/star-toolbar.cpp
index d783e3336..f8c5714cb 100644
--- a/src/widgets/star-toolbar.cpp
+++ b/src/widgets/star-toolbar.cpp
@@ -337,7 +337,7 @@ static void star_tb_event_attr_changed(Inkscape::XML::Node *repr, gchar const *n
             gtk_action_set_sensitive( prop_action, FALSE );
         }
     } else if ((!strcmp(name, "sodipodi:r1") || !strcmp(name, "sodipodi:r2")) && (!isFlatSided) ) {
-        adj = (GtkAdjustment*)g_object_get_data(G_OBJECT(tbl), "proportion");
+        adj = GTK_ADJUSTMENT(g_object_get_data(G_OBJECT(tbl), "proportion"));
         gdouble r1 = 1.0;
         gdouble r2 = 1.0;
         sp_repr_get_double(repr, "sodipodi:r1", &r1);
@@ -348,7 +348,7 @@ static void star_tb_event_attr_changed(Inkscape::XML::Node *repr, gchar const *n
             gtk_adjustment_set_value(adj, r1/r2);
         }
     } else if (!strcmp(name, "sodipodi:sides")) {
-        adj = (GtkAdjustment*)g_object_get_data(G_OBJECT(tbl), "magnitude");
+        adj = GTK_ADJUSTMENT(g_object_get_data(G_OBJECT(tbl), "magnitude"));
         int sides = 0;
         sp_repr_get_int(repr, "sodipodi:sides", &sides);
         gtk_adjustment_set_value(adj, sides);