Added a "quantum" argument for making the panes move in jumps.

2000-06-07  Christopher James Lahey  <clahey@helixcode.com>

	* widgets/e-paned/e-hpaned.c, widgets/e-paned/e-paned.c,
	widgets/e-paned/e-paned.h, widgets/e-paned/e-vpaned.c: Added a
	"quantum" argument for making the panes move in jumps.

svn path=/trunk/; revision=3461

4 files changed, 45 insertions, 10 deletions

diff --git a/widgets/e-paned/e-hpaned.c b/widgets/e-paned/e-hpaned.c
index e7aff16cd9..68fa893210 100644
--- a/widgets/e-paned/e-hpaned.c
+++ b/widgets/e-paned/e-hpaned.c
@@ -353,6 +353,7 @@ e_hpaned_button_press (GtkWidget      *widget,
   if (!paned->in_drag &&
       event->window == paned->handle && event->button == 1)
     {
+      paned->old_child1_size = paned->child1_size;
       paned->in_drag = TRUE;
       /* We need a server grab here, not gtk_grab_add(), since
        * we don't want to pass events on to the widget's children */
@@ -361,7 +362,7 @@ e_hpaned_button_press (GtkWidget      *widget,
 		       | GDK_BUTTON1_MOTION_MASK
 		       | GDK_BUTTON_RELEASE_MASK,
 		       NULL, NULL, event->time);
-      paned->child1_size += event->x - paned->handle_size / 2;
+      paned->child1_size = e_paned_quantized_size(paned, paned->child1_size + event->x - paned->handle_size / 2);
       paned->child1_size = CLAMP (paned->child1_size, 0,
 				  widget->allocation.width
 				  - paned->handle_size
@@ -419,9 +420,9 @@ e_hpaned_motion (GtkWidget      *widget,
   if (paned->in_drag)
     {
       gint size = x - GTK_CONTAINER (paned)->border_width - paned->handle_size / 2;
-
+      
       e_hpaned_xor_line (paned);
-      paned->child1_size = CLAMP (size, paned->min_position, paned->max_position);
+      paned->child1_size = CLAMP (e_paned_quantized_size(paned, size), paned->min_position, paned->max_position);
       e_hpaned_xor_line (paned);
     }
 
diff --git a/widgets/e-paned/e-paned.c b/widgets/e-paned/e-paned.c
index 5d09535ad9..ae68e10082 100644
--- a/widgets/e-paned/e-paned.c
+++ b/widgets/e-paned/e-paned.c
@@ -36,7 +36,8 @@
 
 enum {
   ARG_0,
-  ARG_HANDLE_SIZE
+  ARG_HANDLE_SIZE,
+  ARG_QUANTUM,
 };
 
 static void    e_paned_class_init (EPanedClass  *klass);
@@ -122,6 +123,8 @@ e_paned_class_init (EPanedClass *klass)
 
   gtk_object_add_arg_type("EPaned::handle_size", GTK_TYPE_UINT,
 			  GTK_ARG_READWRITE, ARG_HANDLE_SIZE);
+  gtk_object_add_arg_type("EPaned::quantum", GTK_TYPE_UINT,
+			  GTK_ARG_READWRITE, ARG_QUANTUM);
 }
 
 static GtkType
@@ -153,6 +156,9 @@ e_paned_init (EPaned *paned)
   
   paned->handle_xpos = -1;
   paned->handle_ypos = -1;
+  
+  paned->old_child1_size = 0;
+  paned->quantum = 1;
 }
 
 static void
@@ -167,6 +173,11 @@ e_paned_set_arg (GtkObject *object,
     case ARG_HANDLE_SIZE:
       e_paned_set_handle_size (paned, GTK_VALUE_UINT (*arg));
       break;
+    case ARG_QUANTUM:
+      paned->quantum = GTK_VALUE_UINT (*arg);
+      if (paned->quantum == 0)
+	paned->quantum = 1;
+      break;
     default:
       break;
     }
@@ -184,6 +195,9 @@ e_paned_get_arg (GtkObject *object,
     case ARG_HANDLE_SIZE:
       GTK_VALUE_UINT (*arg) = paned->handle_size;
       break;
+    case ARG_QUANTUM:
+      GTK_VALUE_UINT (*arg) = paned->quantum;
+      break;
     default:
       arg->type = GTK_TYPE_INVALID;
       break;
@@ -547,9 +561,9 @@ e_paned_set_handle_size (EPaned *paned,
 
 void
 e_paned_compute_position(EPaned *paned,
-			   gint      allocation,
-			   gint      child1_req,
-			   gint      child2_req)
+			 gint      allocation,
+			 gint      child1_req,
+			 gint      child2_req)
 {
   g_return_if_fail (paned != NULL);
   g_return_if_fail (E_IS_PANED (paned));
@@ -604,3 +618,17 @@ e_paned_handle_shown(EPaned *paned)
   else
     return TRUE;
 }
+
+gint
+e_paned_quantized_size(EPaned *paned,
+		       gint    size)
+{
+  gint quantization = size - paned->old_child1_size;
+  if (quantization > 0)
+    quantization += paned->quantum / 2;
+  else
+    quantization -= paned->quantum / 2;
+  quantization /= paned->quantum;
+  quantization *= paned->quantum;
+  return paned->old_child1_size + quantization;
+}
diff --git a/widgets/e-paned/e-paned.h b/widgets/e-paned/e-paned.h
index 1c4481b194..e3799a6bce 100644
--- a/widgets/e-paned/e-paned.h
+++ b/widgets/e-paned/e-paned.h
@@ -76,6 +76,9 @@ struct _EPaned
   gint min_position;
   gint max_position;
 
+  gint old_child1_size;
+  gint quantum;
+
   guint position_set : 1;
   guint in_drag : 1;
   guint child1_shrink : 1;
@@ -122,6 +125,8 @@ void    e_paned_compute_position (EPaned   *paned,
 				  gint      child2_req);
 
 gboolean e_paned_handle_shown    (EPaned   *paned);
+gint     e_paned_quantized_size  (EPaned   *paned,
+				  int       size);
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
diff --git a/widgets/e-paned/e-vpaned.c b/widgets/e-paned/e-vpaned.c
index bfa5dced73..0a093af2d9 100644
--- a/widgets/e-paned/e-vpaned.c
+++ b/widgets/e-paned/e-vpaned.c
@@ -352,6 +352,7 @@ e_vpaned_button_press (GtkWidget      *widget,
   if (!paned->in_drag &&
       (event->window == paned->handle) && (event->button == 1))
     {
+      paned->old_child1_size = paned->child1_size;
       paned->in_drag = TRUE;
       /* We need a server grab here, not gtk_grab_add(), since
        * we don't want to pass events on to the widget's children */
@@ -360,7 +361,7 @@ e_vpaned_button_press (GtkWidget      *widget,
 			| GDK_BUTTON1_MOTION_MASK
 			| GDK_BUTTON_RELEASE_MASK, NULL, NULL,
 			event->time);
-      paned->child1_size += event->y - paned->handle_size / 2;
+      paned->child1_size = e_paned_quantized_size(paned, paned->child1_size + event->y - paned->handle_size / 2);
       paned->child1_size = CLAMP (paned->child1_size, 0,
 				  widget->allocation.height -
 				  paned->handle_size -
@@ -418,9 +419,9 @@ e_vpaned_motion (GtkWidget      *widget,
   if (paned->in_drag)
     {
       gint size = y - GTK_CONTAINER(paned)->border_width - paned->handle_size / 2;
-
+      
       e_vpaned_xor_line (paned);
-      paned->child1_size = CLAMP (size, paned->min_position, paned->max_position);
+      paned->child1_size = CLAMP (e_paned_quantized_size(paned, size), paned->min_position, paned->max_position);
       e_vpaned_xor_line(paned);
     }