Change how the widgets are named for CSS

Changed the names of the register parts and added to the class_init
function gtk_widget_class_set_css_name for use with Gtk+ 3.20 and also
a procedure to use gtk_style_context_add_class for earlier versions of
Gtk+

src/register/register-gnome/gnucash-header.c

@@ -601,8 +601,8 @@ gnc_header_init (GncHeader *header)
     header->width = 400;
     header->style = NULL;
 
-    // Set the style context for this widget so it can be easily manipulated with css
+    // This sets a style class for when Gtk+ version is less than 3.20
-    gtk_style_context_add_class (gtk_widget_get_style_context (GTK_WIDGET(header)), "GncRegisterHeader");
+    gnc_widget_set_css_name (GTK_WIDGET(header), "header");
 
     gtk_widget_add_events(GTK_WIDGET(header), (GDK_EXPOSURE_MASK
                           | GDK_BUTTON_PRESS_MASK
@@ -622,6 +622,10 @@ gnc_header_class_init (GncHeaderClass *header_class)
     GObjectClass  *object_class = G_OBJECT_CLASS (header_class);
     GtkWidgetClass *item_class = GTK_WIDGET_CLASS (header_class);
 
+#if GTK_CHECK_VERSION(3,20,0)
+    gtk_widget_class_set_css_name (GTK_WIDGET_CLASS(header_class), "header");
+#endif
+
     parent_class = g_type_class_peek_parent (header_class);
 
     object_class->finalize = gnc_header_finalize;

src/register/register-gnome/gnucash-item-edit.c

@@ -454,6 +454,10 @@ gnc_item_edit_class_init (GncItemEditClass *gnc_item_edit_class)
     GObjectClass  *object_class;
     GtkWidgetClass *widget_class;
 
+#if GTK_CHECK_VERSION(3,20,0)
+    gtk_widget_class_set_css_name (GTK_WIDGET_CLASS(gnc_item_edit_class), "cursor");
+#endif
+
     gnc_item_edit_parent_class = g_type_class_peek_parent (gnc_item_edit_class);
 
     object_class = G_OBJECT_CLASS (gnc_item_edit_class);
@@ -522,8 +526,8 @@ gnc_item_edit_new (GnucashSheet *sheet)
                            NULL);
     gtk_layout_put (GTK_LAYOUT(sheet), GTK_WIDGET(item_edit), 0, 0);
 
-    // Set the style context for this widget so it can be easily manipulated with css
+    // This sets a style class for when Gtk+ version is less than 3.20
-    gtk_style_context_add_class (gtk_widget_get_style_context (GTK_WIDGET(item_edit)), "GncRegisterItemEdit");
+    gnc_widget_set_css_name (GTK_WIDGET(item_edit), "cursor");
 
     /* Create the text entry */
     item_edit->editor = gtk_entry_new();

src/register/register-gnome/gnucash-register.c

@@ -300,6 +300,10 @@ gnucash_register_class_init (GnucashRegisterClass *klass)
 
     gobject_class = G_OBJECT_CLASS (klass);
 
+#if GTK_CHECK_VERSION(3,20,0)
+    gtk_widget_class_set_css_name (GTK_WIDGET_CLASS(klass), "register");
+#endif
+
     register_parent_class = g_type_class_peek_parent (klass);
 
     register_signals[ACTIVATE_CURSOR] =
@@ -346,8 +350,8 @@ gnucash_register_init (GnucashRegister *g_reg)
     gtk_widget_set_can_focus (GTK_WIDGET(table), FALSE);
     gtk_widget_set_can_default (GTK_WIDGET(table), FALSE);
 
-    // Set the style context for this widget so it can be easily manipulated with css
+    // This sets a style class for when Gtk+ version is less than 3.20
-    gtk_style_context_add_class (gtk_widget_get_style_context (GTK_WIDGET(g_reg)), "GncRegister");
+    gnc_widget_set_css_name (GTK_WIDGET(g_reg), "register");
 
     gtk_grid_set_row_homogeneous (GTK_GRID(table), FALSE);
     gtk_grid_set_column_homogeneous (GTK_GRID(table), FALSE);

src/register/register-gnome/gnucash-sheet-private.c

@@ -722,3 +722,12 @@ gnucash_sheet_draw_cursor (GnucashCursor *cursor, cairo_t *cr)
     cairo_set_line_width (cr, 1.0);
     cairo_stroke (cr);
 }
+
+void
+gnc_widget_set_css_name (GtkWidget *widget, const char *name)
+{
+#if !GTK_CHECK_VERSION(3,20,0)
+    GtkStyleContext *context = gtk_widget_get_style_context (widget);
+    gtk_style_context_add_class (context, name);
+#endif
+}

src/register/register-gnome/gnucash-sheet.c

@@ -2477,6 +2477,10 @@ gnucash_sheet_class_init (GnucashSheetClass *klass)
     gobject_class = G_OBJECT_CLASS (klass);
     widget_class = GTK_WIDGET_CLASS (klass);
 
+#if GTK_CHECK_VERSION(3,20,0)
+    gtk_widget_class_set_css_name (GTK_WIDGET_CLASS(klass), "sheet");
+#endif
+
     sheet_parent_class = g_type_class_peek_parent (klass);
 
     /* Method override */
@@ -2503,8 +2507,8 @@ gnucash_sheet_init (GnucashSheet *sheet)
     gtk_widget_set_can_focus (GTK_WIDGET(sheet), TRUE);
     gtk_widget_set_can_default (GTK_WIDGET(sheet), TRUE);
 
-    // Set the style context for this widget so it can be easily manipulated with css
+    // This sets a style class for when Gtk+ version is less than 3.20
-    gtk_style_context_add_class (gtk_widget_get_style_context (GTK_WIDGET(sheet)), "GncRegisterSheet");
+    gnc_widget_set_css_name (GTK_WIDGET(sheet), "sheet");
 
     sheet->num_visible_blocks = 1;
     sheet->num_visible_phys_rows = 1;

src/register/register-gnome/gnucash-sheetP.h

@@ -138,6 +138,7 @@ gboolean gnucash_sheet_draw_internal (GnucashSheet *sheet, cairo_t *cr,
                                       GtkAllocation *alloc);
 void gnucash_sheet_draw_cursor (GnucashCursor *cursor, cairo_t *cr);
 
+void gnc_widget_set_css_name (GtkWidget *widget, const char *name);
 
 /** @} */
 #endif