[gtk/columnview-work: 8/42] columnview: Revise scroll-minimum handling

[Matthias Clasen <matthiasc src gnome org>]

commit cbabb85e6d00e3d58d7be5eb404d71625afc9e99
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Dec 16 19:22:03 2019 -0500

    columnview: Revise scroll-minimum handling
    
    Tweak the behavior slightly. We don't show
    a scrollbar as long as we have at least
    min-size available, but we still give the
    entire size to the child, up to nat-size.
    
    This matches how viewports handle scroll-minimum.

 gtk/gtkcolumnview.c | 52 ++++++++++++++++++++++++++++++----------------------
 1 file changed, 30 insertions(+), 22 deletions(-)
---
diff --git a/gtk/gtkcolumnview.c b/gtk/gtkcolumnview.c
index 7ae41f8b1c..503c4c41b1 100644
--- a/gtk/gtkcolumnview.c
+++ b/gtk/gtkcolumnview.c
@@ -34,6 +34,7 @@
 #include "gtkprivate.h"
 #include "gtkscrollable.h"
 #include "gtkwidgetprivate.h"
+#include "gtksizerequest.h"
 
 /**
  * SECTION:gtkcolumnview
@@ -171,46 +172,53 @@ gtk_column_view_allocate_columns (GtkColumnView *self,
   GtkScrollablePolicy scroll_policy;
   int col_min, col_nat, widget_min, widget_nat, extra, col_size, x;
   guint i;
+  int n;
+  GtkRequestedSize *sizes;
+
+  n = g_list_model_get_n_items (G_LIST_MODEL (self->columns));
+  sizes = g_newa (GtkRequestedSize, n);
+  for (i = 0; i < n; i++)
+    {
+      GtkColumnViewColumn *column;
+
+      column = g_list_model_get_item (G_LIST_MODEL (self->columns), i);
+      if (gtk_column_view_column_get_visible (column))
+        gtk_column_view_column_measure (column, &sizes[i].minimum_size, &sizes[i].natural_size);
+      else
+        sizes[i].minimum_size = sizes[i].natural_size = 0;
+      g_object_unref (column);
+    }
 
   gtk_column_view_measure_across (self, &col_min, &col_nat);
-  gtk_widget_measure (GTK_WIDGET (self),
-                      GTK_ORIENTATION_HORIZONTAL, -1,
-                      &widget_min, &widget_nat,
-                      NULL, NULL);
 
   scroll_policy = gtk_scrollable_get_hscroll_policy (GTK_SCROLLABLE (self->listview));
   if (scroll_policy == GTK_SCROLL_MINIMUM)
     {
-      extra = widget_min - col_min;
-      col_size = col_min;
+      extra = MAX (width - col_min, 0);
+      gtk_distribute_natural_allocation (extra, n, sizes);
     }
-  else
-    {
-      extra = widget_nat - col_nat;
-      col_size = col_nat;
-    }
-  width -= extra;
-  width = MAX (width, col_size);
 
   x = 0;
-  for (i = 0; i < g_list_model_get_n_items (G_LIST_MODEL (self->columns)); i++)
+  for (i = 0; i < n; i++)
     {
       GtkColumnViewColumn *column;
 
       column = g_list_model_get_item (G_LIST_MODEL (self->columns), i);
-      gtk_column_view_column_measure (column, &col_min, &col_nat);
-      if (scroll_policy == GTK_SCROLL_MINIMUM)
-        col_size = col_min;
-      else
-        col_size = col_nat;
+      if (gtk_column_view_column_get_visible (column))
+        {
+          if (scroll_policy == GTK_SCROLL_MINIMUM)
+            col_size = sizes[i].minimum_size;
+          else
+            col_size = sizes[i].natural_size;
 
-      gtk_column_view_column_allocate (column, x, col_size);
-      x += col_size;
+          gtk_column_view_column_allocate (column, x, col_size);
+          x += col_size;
+        }
 
       g_object_unref (column);
     }
 
-  return width + extra;
+  return x;
 }
 
 static void