Implement item stacking.

git-svn-id: http://svn.drobilla.net/lad/trunk/ganv@4876 a436a847-0d15-0410-975c-d299462d15a1

8 files changed, 36 insertions, 91 deletions

diff --git a/src/Canvas.cpp b/src/Canvas.cpp
index 7674813..dcc59b2 100644
--- a/src/Canvas.cpp
+++ b/src/Canvas.cpp
@@ -960,7 +960,6 @@ GanvCanvasImpl::select_drag_handler(GdkEvent* event)
 				"fill-color", SELECT_RECT_FILL_COLOUR,
 				"border-color", SELECT_RECT_BORDER_COLOUR,
 				NULL));
-		ganv_item_lower_to_bottom(GANV_ITEM(_select_rect));
 		ganv_item_grab(
 			GANV_ITEM(root()), GDK_POINTER_MOTION_MASK|GDK_BUTTON_RELEASE_MASK,
 			NULL, event->button.time);
diff --git a/src/canvas-base.c b/src/canvas-base.c
index 76e34e0..653ebf2 100644
--- a/src/canvas-base.c
+++ b/src/canvas-base.c
@@ -216,6 +216,7 @@ ganv_item_construct(GanvItem* item, GanvItem* parent,
 
 	item->parent = parent;
 	item->canvas = item->parent->canvas;
+	item->layer = 0;
 
 	g_object_set_valist(G_OBJECT(item), first_arg_name, args);
 
@@ -402,6 +403,18 @@ ganv_item_set_valist(GanvItem* item, const gchar* first_arg_name, va_list args)
 	item->canvas->need_repick = TRUE;
 }
 
+void
+ganv_item_raise(GanvItem* item)
+{
+	++item->layer;
+}
+
+void
+ganv_item_lower(GanvItem* item)
+{
+	--item->layer;
+}
+
 /**
  * ganv_item_move:
  * @item: A canvas item.
@@ -421,90 +434,6 @@ ganv_item_move(GanvItem* item, double dx, double dy)
 	item->canvas->need_repick = TRUE;
 }
 
-/* Convenience function to reorder items in a group's child list.  This puts the
- * specified link after the "before" link. Returns TRUE if the list was changed.
- */
-#if 0
-static gboolean
-put_item_after(GList* link, GList* before)
-{
-	GanvGroup* parent;
-	GList*     old_before, * old_after;
-	GList*     after;
-
-	parent = GANV_GROUP(GANV_ITEM(link->data)->parent);
-
-	if (before) {
-		after = before->next;
-	} else {
-		after = parent->item_list;
-	}
-
-	if (( before == link) || ( after == link) ) {
-		return FALSE;
-	}
-
-	/* Unlink */
-
-	old_before = link->prev;
-	old_after  = link->next;
-
-	if (old_before) {
-		old_before->next = old_after;
-	} else {
-		parent->item_list = old_after;
-	}
-
-	if (old_after) {
-		old_after->prev = old_before;
-	} else {
-		parent->item_list_end = old_before;
-	}
-
-	/* Relink */
-
-	link->prev = before;
-	if (before) {
-		before->next = link;
-	} else {
-		parent->item_list = link;
-	}
-
-	link->next = after;
-	if (after) {
-		after->prev = link;
-	} else {
-		parent->item_list_end = link;
-	}
-
-	return TRUE;
-}
-#endif
-
-/**
- * ganv_item_raise_to_top:
- * @item: A canvas item.
- *
- * Raises an item to the top of its parent's stack.
- **/
-void
-ganv_item_raise_to_top(GanvItem* item)
-{
-	fprintf(stderr, "FIXME: ganv_item_raise_to_top\n");
-}
-
-/**
- * ganv_item_lower_to_bottom:
- * @item: A canvas item.
- *
- * Lowers an item to the bottom of its parent's stack.
- **/
-void
-ganv_item_lower_to_bottom(GanvItem* item)
-{
-	fprintf(stderr, "FIXME: ganv_item_lower_to_bottom\n");
-}
-
 /**
  * ganv_item_show:
  * @item: A canvas item.
diff --git a/src/edge.c b/src/edge.c
index 3a34c20..21ce8de 100644
--- a/src/edge.c
+++ b/src/edge.c
@@ -644,7 +644,7 @@ void
 ganv_edge_highlight(GanvEdge* edge)
 {
 	edge->impl->highlighted = TRUE;
-	ganv_item_raise_to_top(GANV_ITEM(edge));
+	ganv_item_raise(GANV_ITEM(edge));
 	ganv_item_request_update(GANV_ITEM(edge));
 }
 
@@ -652,6 +652,7 @@ void
 ganv_edge_unhighlight(GanvEdge* edge)
 {
 	edge->impl->highlighted = FALSE;
+	ganv_item_lower(GANV_ITEM(edge));
 	ganv_item_request_update(GANV_ITEM(edge));
 }
 
diff --git a/src/ganv-private.h b/src/ganv-private.h
index ad36e21..ddf6ab5 100644
--- a/src/ganv-private.h
+++ b/src/ganv-private.h
@@ -104,6 +104,7 @@ struct _GanvNodeImpl {
 	double            border_width;
 	guint             fill_color;
 	guint             border_color;
+	guint             layer;
 	gboolean          can_tail;
 	gboolean          can_head;
 	gboolean          selected;
diff --git a/src/ganv_test.c b/src/ganv_test.c
index 971b3e1..97de437 100644
--- a/src/ganv_test.c
+++ b/src/ganv_test.c
@@ -84,7 +84,6 @@ main(int argc, char** argv)
 	ganv_port_set_control_is_toggle(tport, TRUE);
 
 	ganv_item_show(GANV_ITEM(module));
-	ganv_item_raise_to_top(GANV_ITEM(module));
 
 	GanvModule* module2 = ganv_module_new(canvas,
 	                                      "x", 200.0,
@@ -104,7 +103,6 @@ main(int argc, char** argv)
 	                 G_CALLBACK(on_disconnect), canvas);
 
 	ganv_item_show(GANV_ITEM(module2));
-	ganv_item_raise_to_top(GANV_ITEM(module2));
 
 	gtk_widget_show_all(GTK_WIDGET(win));
 	gtk_window_present(win);
diff --git a/src/group.c b/src/group.c
index cd5e912..2a12951 100644
--- a/src/group.c
+++ b/src/group.c
@@ -195,6 +195,12 @@ ganv_group_unmap(GanvItem* item)
 	(*group_parent_class->unmap)(item);
 }
 
+static gint
+item_layer_cmp(const void* a, const void* b, void* user_data)
+{
+	return ((GanvItem*)a)->layer - ((GanvItem*)b)->layer;
+}
+
 static void
 ganv_group_draw(GanvItem* item, cairo_t* cr,
                 int x, int y, int width, int height)
@@ -210,6 +216,7 @@ ganv_group_draw(GanvItem* item, cairo_t* cr,
 	cairo_rectangle(cr, x, y, width, height);
 	cairo_fill(cr);
 
+	GSequence* items = g_sequence_new(NULL);
 	for (list = group->item_list; list; list = list->next) {
 		child = (GanvItem*)list->data;
 
@@ -224,11 +231,20 @@ ganv_group_draw(GanvItem* item, cairo_t* cr,
 		        && (child->x2 > child->canvas->redraw_x1)
 		        && (child->y2 > child->canvas->redraw_y2))) {
 			if (GANV_ITEM_GET_CLASS(child)->draw) {
-				(*GANV_ITEM_GET_CLASS(child)->draw)(
-				    child, cr, x, y, width, height);
+				g_sequence_insert_sorted(items, child, item_layer_cmp, NULL);
 			}
 		}
 	}
+
+	for (GSequenceIter* i = g_sequence_get_begin_iter(items);
+	     !g_sequence_iter_is_end(i);
+	     i = g_sequence_iter_next(i)) {
+		child = (GanvItem*)g_sequence_get(i);
+		(*GANV_ITEM_GET_CLASS(child)->draw)(
+			child, cr, x, y, width, height);
+	}
+		
+	g_sequence_free(items);
 }
 
 static double
diff --git a/src/module.c b/src/module.c
index 98e7272..654038a 100644
--- a/src/module.c
+++ b/src/module.c
@@ -798,7 +798,6 @@ ganv_module_embed(GanvModule* module,
 	on_embed_size_request(widget, &r, module);
 
 	ganv_item_show(impl->embed_item);
-	ganv_item_raise_to_top(impl->embed_item);
 
 	g_signal_connect(widget, "size-request",
 	                 G_CALLBACK(on_embed_size_request), module);
diff --git a/src/node.c b/src/node.c
index f49f688..8bafbde 100644
--- a/src/node.c
+++ b/src/node.c
@@ -426,11 +426,13 @@ ganv_node_default_event(GanvItem* item,
 
 	switch (event->type) {
 	case GDK_ENTER_NOTIFY:
+		ganv_item_raise(GANV_ITEM(node));
 		ganv_item_set(GANV_ITEM(node),
 		              "highlighted", TRUE, NULL);
 		return TRUE;
 
 	case GDK_LEAVE_NOTIFY:
+		ganv_item_lower(GANV_ITEM(node));
 		ganv_item_set(GANV_ITEM(node),
 		              "highlighted", FALSE, NULL);
 		return TRUE;