From 3ac29861719e42f10ad559890e747e34fe70be64 Mon Sep 17 00:00:00 2001
From: Insality <insality@gmail.com>
Date: Thu, 27 Jan 2022 22:29:13 +0200
Subject: [PATCH] #162 Add static grid last row alignment

---
 druid/base/static_grid.lua                    | 29 ++++++++++++++++++-
 druid/styles/default/style.lua                |  1 +
 .../grid/static_grid/static_grid.gui_script   |  4 +++
 3 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/druid/base/static_grid.lua b/druid/base/static_grid.lua
index 7716718..43863de 100644
--- a/druid/base/static_grid.lua
+++ b/druid/base/static_grid.lua
@@ -70,9 +70,11 @@ end
 -- or create your own style
 -- @table style
 -- @tfield[opt=false] bool IS_DYNAMIC_NODE_POSES If true, always center grid content as grid pivot sets
+-- @tfield[opt=false] bool IS_ALIGN_LAST_ROW If true, always align last row of the grid as grid pivot sets
 function StaticGrid.on_style_change(self, style)
 	self.style = {}
 	self.style.IS_DYNAMIC_NODE_POSES = style.IS_DYNAMIC_NODE_POSES or false
+	self.style.IS_ALIGN_LAST_ROW = style.IS_ALIGN_LAST_ROW or false
 end
 
 
@@ -122,7 +124,9 @@ function StaticGrid.get_pos(self, index)
 	local row = math.ceil(index / self.in_row) - 1
 	local col = (index - row * self.in_row) - 1
 
-	_temp_pos.x = col * self.node_size.x + self._zero_offset.x
+	local zero_offset_x = self:_get_zero_offset_x(row)
+
+	_temp_pos.x = col * self.node_size.x + zero_offset_x
 	_temp_pos.y = -row * self.node_size.y + self._zero_offset.y
 	_temp_pos.z = 0
 
@@ -437,4 +441,27 @@ function StaticGrid:_get_zero_offset()
 end
 
 
+--- Return offset x for last row in grid. Used to align this row accorting to grid's anchor
+-- @function static:_grid:_get_zero_offset_x
+-- @treturn number The offset x value
+-- @local
+function StaticGrid:_get_zero_offset_x(row_index)
+	if not self.style.IS_DYNAMIC_NODE_POSES or not self.style.IS_ALIGN_LAST_ROW then
+		return self._zero_offset.x
+	end
+
+	local offset_x = self._zero_offset.x
+	local last_row = math.ceil(self.last_index / self.in_row) - 1
+
+	if last_row > 0 and last_row == row_index then
+		local elements_in_row = (self.last_index - (last_row * self.in_row)) - 1
+		local offset = elements_in_row * self.node_size.x * self.anchor.x
+		offset_x = self.node_size.x * self.node_pivot.x - self.node_size.x * self.pivot.x - offset
+	end
+
+	return offset_x
+end
+
+
+
 return StaticGrid
diff --git a/druid/styles/default/style.lua b/druid/styles/default/style.lua
index 147aad4..791cd51 100644
--- a/druid/styles/default/style.lua
+++ b/druid/styles/default/style.lua
@@ -61,6 +61,7 @@ M["drag"] = {
 
 M["static_grid"] = {
 	IS_DYNAMIC_NODE_POSES = false, -- Always align by content size with node anchor
+	IS_ALIGN_LAST_ROW = true, -- Align the last row of grid
 }
 
 
diff --git a/example/examples/grid/static_grid/static_grid.gui_script b/example/examples/grid/static_grid/static_grid.gui_script
index f162460..2579bda 100644
--- a/example/examples/grid/static_grid/static_grid.gui_script
+++ b/example/examples/grid/static_grid/static_grid.gui_script
@@ -39,6 +39,10 @@ function init(self)
 		grid_e,
 	}
 
+	for i = 1, #grids do
+		grids[i].style.IS_DYNAMIC_NODE_POSES = false
+	end
+
 
 	local animate_grides = function()
 		for _, grid in ipairs(grids) do