[gtk+] tests: Add widget focus test case

[Timm Bäder <baedert src gnome org>]

commit 9b70d9897d52fc5612c0059e088e8ad6e1cfe8e4
Author: Timm Bäder <mail baedert org>
Date:   Thu Feb 9 17:59:24 2017 +0100

    tests: Add widget focus test case
    
    Shows an example of a widget that directly inherits from GtkWidget and
    has multiple focusable children.

 tests/Makefile.am       |    4 +
 tests/testwidgetfocus.c |  171 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 175 insertions(+), 0 deletions(-)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 82d1554..1c5fc31 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -156,6 +156,7 @@ noinst_PROGRAMS =  $(TEST_PROGS)    \
        testpopup                       \
        testpopupat                     \
        testgaction                     \
+       testwidgetfocus                 \
        $(NULL)
 
 if USE_X11
@@ -268,6 +269,7 @@ testrevealer2_DEPENDENCIES = $(TEST_DEPS)
 testtitlebar_DEPENDENCIES = $(TEST_DEPS)
 testwindowsize_DEPENDENCIES = $(TEST_DEPS)
 listmodel_DEPENDENCIES = $(TEST_DEPS)
+testwidgetfocus_DEPENDENCIES = $(TEST_DEPS)
 
 animated_resizing_SOURCES =    \
        animated-resizing.c     \
@@ -457,6 +459,8 @@ testglblending_SOURCES =    \
 
 listmodel_SOURCES = listmodel.c
 
+testwidgetfocus_SOURCES = testwidgetfocus.c
+
 EXTRA_DIST +=                  \
        gradient1.png           \
        testgtk.1               \
diff --git a/tests/testwidgetfocus.c b/tests/testwidgetfocus.c
new file mode 100644
index 0000000..e63deb3
--- /dev/null
+++ b/tests/testwidgetfocus.c
@@ -0,0 +1,171 @@
+#include <gtk/gtk.h>
+
+
+
+typedef struct _GtkFocusWidget      GtkFocusWidget;
+typedef struct _GtkFocusWidgetClass GtkFocusWidgetClass;
+
+#define GTK_TYPE_FOCUS_WIDGET           (gtk_focus_widget_get_type ())
+#define GTK_FOCUS_WIDGET(obj)           (G_TYPE_CHECK_INSTANCE_CAST(obj, GTK_TYPE_FOCUS_WIDGET, 
GtkFocusWidget))
+#define GTK_FOCUS_WIDGET_CLASS(cls)     (G_TYPE_CHECK_CLASS_CAST(cls, GTK_TYPE_FOCUS_WIDGET, 
GtkFocusWidgetClass))
+#define GTK_IS_FOCUS_WIDGET(obj)        (G_TYPE_CHECK_INSTANCE_TYPE(obj, GTK_TYPE_FOCUS_WIDGET))
+#define GTK_IS_FOCUS_WIDGET_CLASS(cls)   (G_TYPE_CHECK_CLASS_TYPE(cls, GTK_TYPE_FOCUS_WIDGET))
+#define GTK_FOCUS_WIDGET_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS(obj, GTK_TYPE_FOCUS_WIDGET, 
GtkFocusWidgetClass))
+
+#define SPACING 30
+
+struct _GtkFocusWidget
+{
+  GtkWidget parent_instance;
+
+  union {
+    struct {
+      GtkWidget *child1;
+      GtkWidget *child2;
+      GtkWidget *child3;
+      GtkWidget *child4;
+    };
+    GtkWidget* children[4];
+  };
+};
+
+struct _GtkFocusWidgetClass
+{
+  GtkWidgetClass parent_class;
+};
+
+GType gtk_focus_widget_get_type (void) G_GNUC_CONST;
+
+
+G_DEFINE_TYPE(GtkFocusWidget, gtk_focus_widget, GTK_TYPE_WIDGET)
+
+static void
+gtk_focus_widget_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
+{
+  GtkFocusWidget *self = GTK_FOCUS_WIDGET (widget);
+  int child_width  = (allocation->width  - (3 * SPACING)) / 2;
+  int child_height = (allocation->height - (3 * SPACING)) / 2;
+  GtkAllocation child_alloc;
+
+  child_alloc.x = SPACING + allocation->x;
+  child_alloc.y = SPACING + allocation->y;
+  child_alloc.width = child_width;
+  child_alloc.height = child_height;
+
+  gtk_widget_size_allocate (self->child1, &child_alloc);
+
+  child_alloc.x += SPACING + child_width;
+
+  gtk_widget_size_allocate (self->child2, &child_alloc);
+
+  child_alloc.y += SPACING + child_height;
+
+  gtk_widget_size_allocate (self->child4, &child_alloc);
+
+  child_alloc.x -= SPACING + child_width;
+
+  gtk_widget_size_allocate (self->child3, &child_alloc);
+}
+
+static void
+gtk_focus_widget_measure (GtkWidget      *widget,
+                          GtkOrientation  orientation,
+                          int             for_size,
+                          int            *minimum,
+                          int            *natural,
+                          int            *minimum_baseline,
+                          int            *natural_baseline)
+{
+  GtkFocusWidget *self = GTK_FOCUS_WIDGET (widget);
+  int min, nat;
+  int i;
+
+  *minimum = 0;
+  *natural = 0;
+
+  for (i = 0; i < 4; i ++)
+    {
+      gtk_widget_measure (self->children[i], orientation, for_size,
+                          &min, &nat, NULL, NULL);
+
+      *minimum = MAX (*minimum, min);
+      *natural = MAX (*natural, nat);
+    }
+
+  *minimum *= 2;
+  *natural *= 2;
+
+  *minimum += SPACING * 3;
+  *natural += SPACING * 3;
+}
+
+static void
+gtk_focus_widget_snapshot (GtkWidget *widget, GtkSnapshot *snapshot)
+{
+  GtkFocusWidget *self = GTK_FOCUS_WIDGET (widget);
+
+  gtk_widget_snapshot_child (widget, self->child1, snapshot);
+  gtk_widget_snapshot_child (widget, self->child2, snapshot);
+  gtk_widget_snapshot_child (widget, self->child3, snapshot);
+  gtk_widget_snapshot_child (widget, self->child4, snapshot);
+}
+
+static void
+gtk_focus_widget_finalize (GObject *object)
+{
+  GtkFocusWidget *self = GTK_FOCUS_WIDGET (object);
+
+  gtk_widget_unparent (self->child1);
+  gtk_widget_unparent (self->child2);
+  gtk_widget_unparent (self->child3);
+  gtk_widget_unparent (self->child4);
+
+  G_OBJECT_CLASS (gtk_focus_widget_parent_class)->finalize (object);
+}
+
+static void
+gtk_focus_widget_init (GtkFocusWidget *self)
+{
+  gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
+
+  self->child1 = gtk_button_new_with_label ("1");
+  gtk_widget_set_parent (self->child1, GTK_WIDGET (self));
+  self->child2 = gtk_button_new_with_label ("2");
+  gtk_widget_set_parent (self->child2, GTK_WIDGET (self));
+  self->child3 = gtk_button_new_with_label ("3");
+  gtk_widget_set_parent (self->child3, GTK_WIDGET (self));
+  self->child4 = gtk_button_new_with_label ("4");
+  gtk_widget_set_parent (self->child4, GTK_WIDGET (self));
+}
+
+static void
+gtk_focus_widget_class_init (GtkFocusWidgetClass *klass)
+{
+  GObjectClass   *object_class = G_OBJECT_CLASS (klass);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  object_class->finalize = gtk_focus_widget_finalize;
+
+  widget_class->snapshot = gtk_focus_widget_snapshot;
+  widget_class->measure = gtk_focus_widget_measure;
+  widget_class->size_allocate = gtk_focus_widget_size_allocate;
+}
+
+int
+main()
+{
+  GtkWidget *window;
+  GtkWidget *widget;
+  gtk_init ();
+
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  widget = g_object_new (GTK_TYPE_FOCUS_WIDGET, NULL);
+
+  gtk_container_add (GTK_CONTAINER (window), widget);
+  g_signal_connect (window, "delete-event", G_CALLBACK (gtk_main_quit), NULL);
+
+  gtk_widget_show (window);
+
+  gtk_main ();
+}