From dda24956a14bf8180a5c297cda3f3f514aa5f847 Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Sun, 21 May 2023 07:45:17 -0400
Subject: [PATCH] gridview: Add a function to split tiles

Break this part of size_allocate out as a separate function.
Future commits will rewrite size_allocate to make use of it.

Making this a standalone function taking just a listitemmanager
and n_columns as arguments will make it easy to write tests for it.
---
 gtk/gtkgridview.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/gtk/gtkgridview.c b/gtk/gtkgridview.c
index 7bf11e235b..6ccbbf18a2 100644
--- a/gtk/gtkgridview.c
+++ b/gtk/gtkgridview.c
@@ -767,6 +767,48 @@ gtk_grid_view_measure (GtkWidget      *widget,
     gtk_grid_view_measure_across (widget, for_size, minimum, natural);
 }
 
+static void
+gtk_grid_view_split_tiles_by_columns (GtkListItemManager *items,
+                                      guint               n_columns)
+{
+  GtkListTile *tile;
+
+  for (tile = gtk_list_item_manager_get_first (items);
+       tile != NULL;
+       tile = gtk_rb_tree_node_get_next (tile))
+    {
+      if (tile->n_items > 1)
+        {
+          guint pos, col;
+          guint remaining;
+
+          pos = gtk_list_tile_get_position (items, tile);
+          col = gtk_grid_view_get_column_for_position (items, n_columns, pos);
+
+          if (col > 0)
+            {
+              /* Determine if the first row needs to be split off */
+              remaining = n_columns - col;
+              if (remaining > 0 && tile->n_items > remaining)
+                gtk_list_tile_split (items, tile, remaining);
+
+              continue;
+            }
+
+          pos += tile->n_items - 1;
+          col = gtk_grid_view_get_column_for_position (items, n_columns, pos);
+
+          if (col < n_columns - 1)
+            {
+              /* Determine if the last row needs to be split off */
+              remaining = n_columns - (col - 1);
+              if (remaining > 0 && col + 1 < tile->n_items)
+                tile = gtk_list_tile_split (items, tile, tile->n_items - (col + 1));
+            }
+        }
+    }
+}
+
 static void
 gtk_grid_view_size_allocate (GtkWidget *widget,
                              int        width,