[gtk] Add a test for the grid layout manager

[Matthias Clasen <matthiasc src gnome org>]

commit c4fd786866a2d8e757499f3f2d35f221d416de04
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jun 28 13:28:46 2019 +0000

    Add a test for the grid layout manager
    
    Test some obvious conditions. This is mainly
    to test the waters for more intesting tests
    with other layout managers later.

 testsuite/gtk/grid-layout.c | 312 ++++++++++++++++++++++++++++++++++++++++++++
 testsuite/gtk/meson.build   |   1 +
 2 files changed, 313 insertions(+)
---
diff --git a/testsuite/gtk/grid-layout.c b/testsuite/gtk/grid-layout.c
new file mode 100644
index 0000000000..134766bef1
--- /dev/null
+++ b/testsuite/gtk/grid-layout.c
@@ -0,0 +1,312 @@
+/* Copyright (C) 2019 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <gtk/gtk.h>
+
+#define GTK_TYPE_GIZMO                 (gtk_gizmo_get_type ())
+#define GTK_GIZMO(obj)                 (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_GIZMO, GtkGizmo))
+#define GTK_GIZMO_CLASS(klass)         (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_GIZMO, GtkGizmoClass))
+#define GTK_IS_GIZMO(obj)              (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_GIZMO))
+#define GTK_IS_GIZMO_CLASS(klass)      (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_GIZMO))
+#define GTK_GIZMO_GET_CLASS(obj)       (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_GIZMO, GtkGizmoClass))
+
+typedef struct _GtkGizmo GtkGizmo;
+
+struct _GtkGizmo {
+  GtkWidget parent;
+
+  const char *name;
+  int min_width;
+  int min_height;
+  int nat_width;
+  int nat_height;
+  int width;
+  int height;
+};
+
+typedef GtkWidgetClass GtkGizmoClass;
+
+G_DEFINE_TYPE (GtkGizmo, gtk_gizmo, GTK_TYPE_WIDGET);
+
+static void
+gtk_gizmo_measure (GtkWidget      *widget,
+                   GtkOrientation  orientation,
+                   int             for_size,
+                   int            *minimum,
+                   int            *natural,
+                   int            *minimum_baseline,
+                   int            *natural_baseline)
+{
+  GtkGizmo *self = GTK_GIZMO (widget);
+
+  if (orientation == GTK_ORIENTATION_HORIZONTAL)
+    {
+      *minimum = self->min_width;
+      *natural = self->nat_width;
+    }
+  else
+    {
+      *minimum = self->min_height;
+      *natural = self->nat_height;
+    }
+}
+
+static void
+gtk_gizmo_size_allocate (GtkWidget *widget,
+                         int        width,
+                         int        height,
+                         int        baseline)
+{
+  GtkGizmo *self = GTK_GIZMO (widget);
+
+  self->width = width;
+  self->height = height;
+}
+
+static void
+gtk_gizmo_class_init (GtkGizmoClass *klass)
+{
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  widget_class->measure = gtk_gizmo_measure;
+  widget_class->size_allocate = gtk_gizmo_size_allocate;
+}
+
+static void
+gtk_gizmo_init (GtkGizmo *self)
+{
+}
+
+/* Create a grid with three children in row
+ *
+ * +--------+--------+--------+
+ * | child1 | child2 | child3 |
+ * +--------+--------+--------+
+ *
+ * Verify that
+ * - the layout has the expected min and nat sizes
+ * - the children get their nat width when the layout does
+ * - they all get the same height
+ */
+static void
+test_simple_row (void)
+{
+  GtkWidget *window;
+  GtkWidget *parent;
+  GtkLayoutManager *layout;
+  GtkGizmo *child1;
+  GtkGizmo *child2;
+  GtkGizmo *child3;
+  GtkLayoutChild *lc;
+  int minimum, natural;
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  parent = g_object_new (GTK_TYPE_GIZMO, NULL);
+  gtk_container_add (GTK_CONTAINER (window), parent);
+
+  layout = gtk_grid_layout_new ();
+  gtk_widget_set_layout_manager (parent, layout);
+
+  child1 = g_object_new (GTK_TYPE_GIZMO, NULL);
+  child2 = g_object_new (GTK_TYPE_GIZMO, NULL);
+  child3 = g_object_new (GTK_TYPE_GIZMO, NULL);
+
+  child1->name = "child1";
+  child1->min_width = 10;
+  child1->min_height = 10;
+  child1->nat_width = 20;
+  child1->nat_height = 20;
+  child2->name = "child2";
+  child2->min_width = 20;
+  child2->min_height = 20;
+  child2->nat_width = 30;
+  child2->nat_height = 30;
+  child3->name = "child3";
+  child3->min_width = 30;
+  child3->min_height = 30;
+  child3->nat_width = 40;
+  child3->nat_height = 40;
+
+  gtk_widget_set_parent (GTK_WIDGET (child1), parent);
+  gtk_widget_set_parent (GTK_WIDGET (child2), parent);
+  gtk_widget_set_parent (GTK_WIDGET (child3), parent);
+
+  lc = gtk_layout_manager_get_layout_child (layout, GTK_WIDGET (child1));
+  gtk_grid_layout_child_set_left_attach (GTK_GRID_LAYOUT_CHILD (lc), 0);
+  lc = gtk_layout_manager_get_layout_child (layout, GTK_WIDGET (child2));
+  gtk_grid_layout_child_set_left_attach (GTK_GRID_LAYOUT_CHILD (lc), 1);
+  lc = gtk_layout_manager_get_layout_child (layout, GTK_WIDGET (child3));
+  gtk_grid_layout_child_set_left_attach (GTK_GRID_LAYOUT_CHILD (lc), 2);
+
+#if 0
+  gtk_widget_show (window);
+
+  g_timeout_add (1000, (GSourceFunc)gtk_main_quit, NULL);
+  gtk_main ();
+#endif
+
+  gtk_layout_manager_measure (layout,
+                              parent,
+                              GTK_ORIENTATION_HORIZONTAL,
+                              -1,
+                              &minimum,
+                              &natural,
+                              NULL,
+                              NULL);
+
+  g_assert (minimum == 10 + 20 + 30);
+  g_assert (natural == 20 + 30 + 40);
+
+  gtk_layout_manager_measure (layout,
+                              parent,
+                              GTK_ORIENTATION_VERTICAL,
+                              -1,
+                              &minimum,
+                              &natural,
+                              NULL,
+                              NULL);
+
+  g_assert (minimum == 30);
+  g_assert (natural == 40);
+
+  gtk_layout_manager_allocate (layout, parent, 90, 40, 0);
+
+  g_assert (child1->width == 20);
+  g_assert (child2->width == 30);
+  g_assert (child3->width == 40);
+
+  g_assert (child1->height == 40);
+  g_assert (child2->height == 40);
+  g_assert (child3->height == 40);
+
+  gtk_widget_unparent (GTK_WIDGET (child1));
+  gtk_widget_unparent (GTK_WIDGET (child2));
+  gtk_widget_unparent (GTK_WIDGET (child3));
+
+  gtk_widget_destroy (parent);
+}
+
+/* same as the previous test, with a column
+ */
+static void
+test_simple_column (void)
+{
+  GtkWidget *window;
+  GtkWidget *parent;
+  GtkLayoutManager *layout;
+  GtkGizmo *child1;
+  GtkGizmo *child2;
+  GtkGizmo *child3;
+  GtkLayoutChild *lc;
+  int minimum, natural;
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  parent = g_object_new (GTK_TYPE_GIZMO, NULL);
+  gtk_container_add (GTK_CONTAINER (window), parent);
+
+  layout = gtk_grid_layout_new ();
+  gtk_widget_set_layout_manager (parent, layout);
+
+  child1 = g_object_new (GTK_TYPE_GIZMO, NULL);
+  child2 = g_object_new (GTK_TYPE_GIZMO, NULL);
+  child3 = g_object_new (GTK_TYPE_GIZMO, NULL);
+
+  child1->name = "child1";
+  child1->min_width = 10;
+  child1->min_height = 10;
+  child1->nat_width = 20;
+  child1->nat_height = 20;
+  child2->name = "child2";
+  child2->min_width = 20;
+  child2->min_height = 20;
+  child2->nat_width = 30;
+  child2->nat_height = 30;
+  child3->name = "child3";
+  child3->min_width = 30;
+  child3->min_height = 30;
+  child3->nat_width = 40;
+  child3->nat_height = 40;
+
+  gtk_widget_set_parent (GTK_WIDGET (child1), parent);
+  gtk_widget_set_parent (GTK_WIDGET (child2), parent);
+  gtk_widget_set_parent (GTK_WIDGET (child3), parent);
+
+  lc = gtk_layout_manager_get_layout_child (layout, GTK_WIDGET (child1));
+  gtk_grid_layout_child_set_top_attach (GTK_GRID_LAYOUT_CHILD (lc), 0);
+  lc = gtk_layout_manager_get_layout_child (layout, GTK_WIDGET (child2));
+  gtk_grid_layout_child_set_top_attach (GTK_GRID_LAYOUT_CHILD (lc), 1);
+  lc = gtk_layout_manager_get_layout_child (layout, GTK_WIDGET (child3));
+  gtk_grid_layout_child_set_top_attach (GTK_GRID_LAYOUT_CHILD (lc), 2);
+
+#if 0
+  gtk_widget_show (window);
+
+  g_timeout_add (1000, (GSourceFunc)gtk_main_quit, NULL);
+  gtk_main ();
+#endif
+
+  gtk_layout_manager_measure (layout,
+                              parent,
+                              GTK_ORIENTATION_HORIZONTAL,
+                              -1,
+                              &minimum,
+                              &natural,
+                              NULL,
+                              NULL);
+
+  g_assert (minimum == 30);
+  g_assert (natural == 40);
+
+  gtk_layout_manager_measure (layout,
+                              parent,
+                              GTK_ORIENTATION_VERTICAL,
+                              -1,
+                              &minimum,
+                              &natural,
+                              NULL,
+                              NULL);
+
+  g_assert (minimum == 10 + 20 + 30);
+  g_assert (natural == 20 + 30 + 40);
+
+  gtk_layout_manager_allocate (layout, parent, 40, 90, 0);
+
+  g_assert (child1->width == 40);
+  g_assert (child2->width == 40);
+  g_assert (child3->width == 40);
+
+  g_assert (child1->height == 20);
+  g_assert (child2->height == 30);
+  g_assert (child3->height == 40);
+
+  gtk_widget_unparent (GTK_WIDGET (child1));
+  gtk_widget_unparent (GTK_WIDGET (child2));
+  gtk_widget_unparent (GTK_WIDGET (child3));
+
+  gtk_widget_destroy (parent);
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  gtk_test_init (&argc, &argv);
+
+  g_test_add_func ("/grid-layout/row", test_simple_row);
+  g_test_add_func ("/grid-layout/column", test_simple_column);
+
+
+  return g_test_run();
+}
diff --git a/testsuite/gtk/meson.build b/testsuite/gtk/meson.build
index 88016781ed..afa5c3c7dd 100644
--- a/testsuite/gtk/meson.build
+++ b/testsuite/gtk/meson.build
@@ -28,6 +28,7 @@ tests = [
   ['focus'],
   ['gestures'],
   ['grid'],
+  ['grid-layout'],
   ['gtkmenu'],
   ['icontheme'],
   ['keyhash', ['../../gtk/gtkkeyhash.c', gtkresources, '../../gtk/gtkprivate.c'], gtk_cargs],