Add scroll is_node_in_view function

druid/base/scroll.lua

@@ -359,6 +359,23 @@ function Scroll.set_vertical_scroll(self, state)
 end
 
 
+function Scroll.is_node_in_view(self, node)
+	local node_border = helper.get_border(node, gui.get_position(node))
+	local view_border = helper.get_border(self.view_node, -self.position)
+
+	-- Check is vertical outside (Left or Right):
+	if node_border.z < view_border.x or node_border.x > view_border.z then
+		return false
+	end
+
+	-- Check is horizontal outside (Up or Down):
+	if node_border.w > view_border.y or node_border.y < view_border.w then
+		return false
+	end
+
+	return true
+end
+
 
 --- Bind the grid component (Static or Dynamic) to recalculate
 -- scroll size on grid changes

druid/helper.lua

@@ -186,16 +186,25 @@ end
 --- Distance from node to size border
 -- @function helper.get_border
 -- @return vector4 (left, top, right, down)
-function M.get_border(node)
+function M.get_border(node, offset)
 	local pivot = gui.get_pivot(node)
 	local pivot_offset = M.get_pivot_offset(pivot)
 	local size = vmath.mul_per_elem(gui.get_size(node), gui.get_scale(node))
-	return vmath.vector4(
+	local border = vmath.vector4(
 		-size.x*(0.5 + pivot_offset.x),
 		size.y*(0.5 - pivot_offset.y),
 		size.x*(0.5 - pivot_offset.x),
 		-size.y*(0.5 + pivot_offset.y)
 	)
+
+	if offset then
+		border.x = border.x + offset.x
+		border.y = border.y + offset.y
+		border.z = border.z + offset.x
+		border.w = border.w + offset.y
+	end
+
+	return border
 end
 
 

example/page/grid_page.lua

@@ -25,6 +25,7 @@ local function add_node(self, index)
 	local prefab = gui.get_node("grid_nodes_prefab")
 	local cloned = gui.clone_tree(prefab)
 	gui.set_enabled(cloned["grid_nodes_prefab"], true)
+	gui.set_text(cloned["grid_nodes_text"], index)
 
 	local button = self.druid:new_button(cloned["grid_nodes_prefab"], function(_, params, button)
 		remove_node(self, button, true)