[gtk+/wip/events: 12/19] tests: Add a simple test for gestures

[Benjamin Otte <otte src gnome org>]

commit 020615354bbee17b505b08f9ce447315a4d6a962
Author: Benjamin Otte <otte redhat com>
Date:   Tue Mar 6 23:38:37 2012 +0100

    tests: Add a simple test for gestures

 tests/Makefile.am    |    1 +
 tests/testgestures.c |  157 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 158 insertions(+), 0 deletions(-)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 7a13533..96b5606 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -55,6 +55,7 @@ noinst_PROGRAMS =  $(TEST_PROGS)	\
 	testfontchooserdialog 		\
 	testframe			\
 	testgeometry			\
+	testgestures			\
 	testgiconpixbuf			\
 	testgrid			\
 	testgtk				\
diff --git a/tests/testgestures.c b/tests/testgestures.c
new file mode 100644
index 0000000..f0c2230
--- /dev/null
+++ b/tests/testgestures.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2012 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include <gtk/gtk.h>
+
+typedef struct _SwipeData SwipeData;
+struct _SwipeData {
+  double x_offset;
+  double y_offset;
+  double progress;
+  guint color;
+};
+
+static void
+update_swipe (GtkEventRecognizer *recognizer,
+              GtkEventTracker    *tracker,
+              SwipeData          *data)
+{
+  GtkSwipeGesture *swipe = GTK_SWIPE_GESTURE (tracker);
+  GtkWidget *widget = gtk_event_tracker_get_widget (tracker);
+  double x, y;
+
+  gtk_swipe_gesture_get_offset (swipe, &x, &y);
+  x /= gtk_widget_get_allocated_width (widget);
+  y /= gtk_widget_get_allocated_height (widget);
+  data->x_offset = CLAMP (x, -1, 1);
+  data->y_offset = CLAMP (y, -1, 1);
+
+  gtk_widget_queue_draw (widget);
+}
+
+static void
+finish_swipe (GtkEventRecognizer *recognizer,
+              GtkEventTracker    *tracker,
+              SwipeData          *data)
+{
+  GtkSwipeGesture *swipe = GTK_SWIPE_GESTURE (tracker);
+  GtkWidget *widget = gtk_event_tracker_get_widget (tracker);
+  double x, y;
+
+  gtk_swipe_gesture_get_offset (swipe, &x, &y);
+  x /= gtk_widget_get_allocated_width (widget);
+  y /= gtk_widget_get_allocated_height (widget);
+
+  if (ABS (x) >= 0.5)
+    data->color ^= 1;
+  if (ABS (y) >= 0.5)
+    data->color ^= 2;
+
+  data->x_offset = 0;
+  data->y_offset = 0;
+
+  gtk_widget_queue_draw (widget);
+}
+
+static void
+cancel_swipe (GtkEventRecognizer *recognizer,
+              GtkEventTracker    *tracker,
+              SwipeData          *data)
+{
+  GtkWidget *widget = gtk_event_tracker_get_widget (tracker);
+
+  data->x_offset = 0;
+  data->y_offset = 0;
+
+  gtk_widget_queue_draw (widget);
+}
+
+
+static gboolean
+draw_swipe (GtkWidget *widget,
+            cairo_t   *cr,
+            SwipeData *data)
+{
+  static const GdkRGBA colors[4] = {
+    { 1, 0, 0, 1 },
+    { 0, 1, 0, 1 },
+    { 0, 0, 1, 1 },
+    { 1, 1, 0, 1 },
+  };
+  int i, x, y, w, h;
+
+  w = gtk_widget_get_allocated_width (widget);
+  h = gtk_widget_get_allocated_height (widget);
+  x = data->x_offset * w;
+  y = data->y_offset * h;
+
+  cairo_translate (cr, x, y);
+
+  for (i = 0; i < 4; i++)
+    {
+      gdk_cairo_set_source_rgba (cr, &colors[data->color ^ i]);
+      cairo_rectangle (cr,
+                       i % 2 ? (x > 0 ? -w : w) : 0, 
+                       i / 2 ? (y > 0 ? -h : h) : 0,
+                       w, h);
+      cairo_fill (cr);
+    }
+
+  return FALSE;
+}
+
+int
+main (int argc, char *argv[])
+{
+  GtkEventRecognizer *recognizer;
+  GtkWidgetClass *area_class;
+  GtkWidget *window, *area;
+  SwipeData swipe_data = { 0, };
+
+  gtk_init (&argc, &argv);
+
+  area_class = g_type_class_ref (GTK_TYPE_DRAWING_AREA);
+
+  recognizer = gtk_swipe_recognizer_new ();
+  g_signal_connect (recognizer, "started", G_CALLBACK (update_swipe), &swipe_data);
+  g_signal_connect (recognizer, "updated", G_CALLBACK (update_swipe), &swipe_data);
+  g_signal_connect (recognizer, "finished", G_CALLBACK (finish_swipe), &swipe_data);
+  g_signal_connect (recognizer, "cancelled", G_CALLBACK (cancel_swipe), &swipe_data);
+
+  /* This next line is a hack and you should never do it in real life.
+   * Instead, do a subclass. Or get me to add gtk_widget_add_recognizer(). */
+  gtk_widget_class_add_recognizer (area_class, recognizer);
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
+  
+  area = gtk_drawing_area_new ();
+  gtk_widget_set_has_window (area, TRUE);
+  gtk_widget_set_size_request (area, 400, 300);
+  g_signal_connect_after (area, "draw", G_CALLBACK (draw_swipe), &swipe_data);
+  gtk_container_add (GTK_CONTAINER (window), area);
+
+  gtk_widget_show_all (window);
+
+  gtk_main ();
+
+  return 0;
+}