Add shift policy to grids

druid/base/static_grid.lua

@@ -159,15 +159,23 @@ end
 -- @tparam StaticGrid self
 --	@tparam node item Gui node
 -- @tparam[opt] number index The item position. By default add as last item
-function StaticGrid.add(self, item, index)
+-- @tparam[opt=SHIFT.RIGHT] number shift_policy How shift nodes, if required. See const.SHIFT
+function StaticGrid.add(self, item, index, shift_policy)
+	shift_policy = shift_policy or const.SHIFT.RIGHT
 	index = index or ((self.last_index or 0) + 1)
 
 	if self.nodes[index] then
-		-- Move nodes to right
+		if shift_policy == const.SHIFT.RIGHT then
 			for i = self.last_index, index, -1 do
 				self.nodes[i + 1] = self.nodes[i]
 			end
 		end
+		if shift_policy == const.SHIFT.LEFT then
+			for i = self.first_index, index do
+				self.nodes[i - 1] = self.nodes[i]
+			end
+		end
+	end
 
 	self.nodes[index] = item
 
@@ -189,19 +197,25 @@ end
 --- Remove the item from the grid. Note that gui node will be not deleted
 -- @tparam StaticGrid self
 -- @tparam number index The grid node index to remove
--- @tparam bool is_shift_nodes If true, will shift nodes left after index
+-- @tparam[opt=SHIFT.RIGHT] number shift_policy How shift nodes, if required. See const.SHIFT
 -- @treturn Node The deleted gui node from grid
-function StaticGrid.remove(self, index, is_shift_nodes)
+function StaticGrid.remove(self, index, shift_policy)
+	shift_policy = shift_policy or const.SHIFT.RIGHT
 	assert(self.nodes[index], "No grid item at given index " .. index)
 
 	local remove_node = self.nodes[index]
 	self.nodes[index] = nil
 
-	if is_shift_nodes then
+	if shift_policy == const.SHIFT.RIGHT then
 		for i = index, self.last_index do
 			self.nodes[i] = self.nodes[i + 1]
 		end
 	end
+	if shift_policy == const.SHIFT.LEFT then
+		for i = index, self.first_index, -1 do
+			self.nodes[i] = self.nodes[i - 1]
+		end
+	end
 
 	self:_update()
 

druid/const.lua

@@ -89,6 +89,13 @@ M.OS = {
 }
 
 
+M.SHIFT = {
+	NO_SHIFT = 0,
+	LEFT = -1,
+	RIGHT = 1,
+}
+
+
 M.SIDE = {
 	X = "x",
 	Y = "y"

druid/extended/dynamic_grid.lua

@@ -136,18 +136,19 @@ end
 -- @tparam DynamicGrid self
 --	@tparam node node Gui node
 -- @tparam[opt] number index The node position. By default add as last node
--- @tparam[opt=false] bool is_shift_left If true, shift all nodes to the left, otherwise shift nodes to the right
+-- @tparam[opt=SHIFT.RIGHT] number shift_policy How shift nodes, if required. See const.SHIFT
-function DynamicGrid.add(self, node, index, is_shift_left)
+function DynamicGrid.add(self, node, index, shift_policy)
-	local delta = is_shift_left and -1 or 1
+	shift_policy = shift_policy or const.SHIFT.RIGHT
+	local delta = shift_policy -- -1 or 1 or 0
 
 	-- By default add node at end
 	index = index or ((self.last_index or 0) + 1)
 
 	-- If node exist at index place, shifting them
-	local is_shift = self.nodes[index]
+	local is_shift = self.nodes[index] and shift_policy ~= const.SHIFT.NO_SHIFT
 	if is_shift then
 		-- We need to iterate from index to start or end grid, depends of shift side
-		local start_index = is_shift_left and self.first_index or self.last_index
+		local start_index = shift_policy == const.SHIFT.LEFT and self.first_index or self.last_index
 		for i = start_index, index, -delta do
 			self.nodes[i + delta] = self.nodes[i]
 		end
@@ -158,14 +159,13 @@ function DynamicGrid.add(self, node, index, is_shift_left)
 	-- After shifting we should recalc node poses
 	if is_shift then
 		-- We need to iterate from placed node to start or end grid, depends of shift side
-		local target_index = is_shift_left and self.first_index or self.last_index
+		local target_index = shift_policy == const.SHIFT.LEFT and self.first_index or self.last_index
 		for i = index + delta, target_index + delta, delta do
 			local move_node = self.nodes[i]
 			move_node.pos = self:get_pos(i, move_node.node, i - delta)
 		end
 	end
 
-
 	-- Sync grid data
 	self:_update()
 
@@ -178,9 +178,11 @@ end
 -- @tparam DynamicGrid self
 -- @tparam number index The grid node index to remove
 -- @tparam[opt=false] bool is_shift_left If true, shift all nodes to the left, otherwise shift nodes to the right
+-- @tparam[opt=SHIFT.RIGHT] number shift_policy How shift nodes, if required. See const.SHIFT
 -- @treturn Node The deleted gui node from grid
-function DynamicGrid.remove(self, index, is_shift_left)
+function DynamicGrid.remove(self, index, shift_policy)
-	local delta = is_shift_left and -1 or 1
+	shift_policy = shift_policy or const.SHIFT.RIGHT
+	local delta = shift_policy -- -1 or 1 or 0
 
 	assert(self.nodes[index], "No grid item at given index " .. index)
 
@@ -189,13 +191,15 @@ function DynamicGrid.remove(self, index, is_shift_left)
 	self.nodes[index] = nil
 
 	-- After delete node, we should shift nodes and recalc their poses, depends from is_shift_left
-	local target_index = is_shift_left and self.first_index or self.last_index
+	if shift_policy ~= const.SHIFT.NO_SHIFT then
+		local target_index = shift_policy == const.SHIFT.LEFT and self.first_index or self.last_index
 		for i = index, target_index, delta do
 			self.nodes[i] = self.nodes[i + delta]
 			if self.nodes[i] then
 				self.nodes[i].pos = self:get_pos(i, self.nodes[i].node, i - delta)
 			end
 		end
+	end
 
 	-- Sync grid data
 	self:_update()
@@ -407,7 +411,6 @@ function DynamicGrid:get_offset()
 	local offset = vmath.vector3(
 		(borders.z + borders.x)/2 + size.x * self.pivot.x,
 		(borders.y + borders.w)/2 + size.y * self.pivot.y,
-		0,
 		0)
 
 	return offset

druid/extended/infinity_list.lua

@@ -1,6 +1,7 @@
 --- Manage data for huge dataset in scroll
 --- It requires basic druid scroll and druid grid components
 local const = require("druid.const")
+local helper = require("druid.helper")
 local component = require("druid.component")
 
 local M = component.create("infinity_list", { const.ON_UPDATE })
@@ -12,6 +13,7 @@ function M:init(data_list, scroll, grid, create_function)
     self.druid = self:get_druid()
     self.scroll = scroll
     self.grid = grid
+    self.scroll:bind_grid(grid)
 
     self.data = data_list
     self.top_index = 1
@@ -46,20 +48,27 @@ function M:set_data(data_list)
 end
 
 
+function M:scroll_to_index(index)
+    self.top_index = helper.clamp(index, 1, #self.data)
+    self:_refresh()
+    self.scroll.on_scroll:trigger(self:get_context(), self)
+end
+
+
 function M:_add_at(index)
     if self.nodes[index] then
         self:_remove_at(index)
     end
 
     local node, instance = self.create_function(self.data[index], index)
-    self.grid:add(node, index)
+    self.grid:add(node, index, const.SHIFT.NO_SHIFT)
     self.nodes[index] = node
     self.components[index] = instance
 end
 
 
 function M:_remove_at(index)
-    self.grid:remove(index)
+    self.grid:remove(index, const.SHIFT.NO_SHIFT)
 
     local node = self.nodes[index]
     gui.delete_node(node)