[glade/margins: 3/8] Made margins edit mode snap bu 8px while holding ALT

[Juan Pablo Ugarte <jpu src gnome org>]

commit a503fad23e981a7a2632f423d89e9f6048e7ba55
Author: Juan Pablo Ugarte <juanpablougarte gmail com>
Date:   Tue Apr 26 17:13:53 2011 -0300

    Made margins edit mode snap bu 8px while holding ALT

 gladeui/glade-design-layout.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/gladeui/glade-design-layout.c b/gladeui/glade-design-layout.c
index 894bea7..dff5756 100644
--- a/gladeui/glade-design-layout.c
+++ b/gladeui/glade-design-layout.c
@@ -42,6 +42,8 @@
 #define OUTLINE_WIDTH     4
 #define PADDING           10
 
+#define MARGIN_STEP       8
+
 typedef enum
 {
   ACTIVITY_NONE,
@@ -276,18 +278,21 @@ glade_design_layout_motion_notify_event (GtkWidget *widget, GdkEventMotion *ev)
     case ACTIVITY_MARGINS:
         {
           gboolean shift = ev->state & GDK_SHIFT_MASK;
+          gboolean snap = ev->state & GDK_MOD1_MASK;
           GtkWidget *selection = priv->selection;
           Margins margin = priv->margin;
 
           if (margin & MARGIN_TOP)
             {
               gint val = MAX (0, priv->m_dy - y);
+              if (snap) val = (val/MARGIN_STEP)*MARGIN_STEP;
               gtk_widget_set_margin_top (selection, val);
               if (shift) gtk_widget_set_margin_bottom (selection, val);
             }
           else if (margin & MARGIN_BOTTOM)
             {
               gint val = MAX (0, y - priv->m_dy);
+              if (snap) val = (val/MARGIN_STEP)*MARGIN_STEP;
               gtk_widget_set_margin_bottom (selection, val);
               if (shift) gtk_widget_set_margin_top (selection, val);
             }
@@ -295,12 +300,14 @@ glade_design_layout_motion_notify_event (GtkWidget *widget, GdkEventMotion *ev)
           if (margin & MARGIN_LEFT)
             {
               gint val = MAX (0, priv->m_dx - x);
+              if (snap) val = (val/MARGIN_STEP)*MARGIN_STEP;
               gtk_widget_set_margin_left (selection, val);
               if (shift) gtk_widget_set_margin_right (selection, val);
             }
           else if (margin & MARGIN_RIGHT)
             {
               gint val = MAX (0, x - priv->m_dx);
+              if (snap) val = (val/MARGIN_STEP)*MARGIN_STEP;
               gtk_widget_set_margin_right (selection, val);
               if (shift) gtk_widget_set_margin_left (selection, val);
             }