added this directory with stuff from the tutorial, updated to compile and

Mon Mar 23 12:03:03 CST 1998 Shawn T. Amundson <amundson@gtk.org>

        * examples/: added this directory with stuff from
          the tutorial, updated to compile and work with recent
          changes

2 files changed, 184 insertions, 0 deletions

diff --git a/examples/scribble-simple/Makefile b/examples/scribble-simple/Makefile
new file mode 100644
index 0000000000..cc752f18d7
--- /dev/null
+++ b/examples/scribble-simple/Makefile
@@ -0,0 +1,8 @@
+
+CC = gcc
+
+scribble-simple: scribble-simple.c
+	$(CC) `gtk-config --cflags` `gtk-config --libs` scribble-simple.c -o scribble-simple 
+
+clean: 
+	rm scribble-simple
diff --git a/examples/scribble-simple/scribble-simple.c b/examples/scribble-simple/scribble-simple.c
new file mode 100644
index 0000000000..e6a250a86e
--- /dev/null
+++ b/examples/scribble-simple/scribble-simple.c
@@ -0,0 +1,176 @@
+/* GTK - The GIMP Toolkit
+ * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <gtk/gtk.h>
+
+/* Backing pixmap for drawing area */
+static GdkPixmap *pixmap = NULL;
+
+/* Create a new backing pixmap of the appropriate size */
+static gint
+configure_event (GtkWidget *widget, GdkEventConfigure *event)
+{
+  if (pixmap)
+    gdk_pixmap_unref(pixmap);
+
+  pixmap = gdk_pixmap_new(widget->window,
+			  widget->allocation.width,
+			  widget->allocation.height,
+			  -1);
+  gdk_draw_rectangle (pixmap,
+		      widget->style->white_gc,
+		      TRUE,
+		      0, 0,
+		      widget->allocation.width,
+		      widget->allocation.height);
+
+  return TRUE;
+}
+
+/* Redraw the screen from the backing pixmap */
+static gint
+expose_event (GtkWidget *widget, GdkEventExpose *event)
+{
+  gdk_draw_pixmap(widget->window,
+		  widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
+		  pixmap,
+		  event->area.x, event->area.y,
+		  event->area.x, event->area.y,
+		  event->area.width, event->area.height);
+
+  return FALSE;
+}
+
+/* Draw a rectangle on the screen */
+static void
+draw_brush (GtkWidget *widget, gdouble x, gdouble y)
+{
+  GdkRectangle update_rect;
+
+  update_rect.x = x - 5;
+  update_rect.y = y - 5;
+  update_rect.width = 10;
+  update_rect.height = 10;
+  gdk_draw_rectangle (pixmap,
+		      widget->style->black_gc,
+		      TRUE,
+		      update_rect.x, update_rect.y,
+		      update_rect.width, update_rect.height);
+  gtk_widget_draw (widget, &update_rect);
+}
+
+static gint
+button_press_event (GtkWidget *widget, GdkEventButton *event)
+{
+  if (event->button == 1 && pixmap != NULL)
+    draw_brush (widget, event->x, event->y);
+
+  return TRUE;
+}
+
+static gint
+motion_notify_event (GtkWidget *widget, GdkEventMotion *event)
+{
+  int x, y;
+  GdkModifierType state;
+
+  if (event->is_hint)
+    gdk_window_get_pointer (event->window, &x, &y, &state);
+  else
+    {
+      x = event->x;
+      y = event->y;
+      state = event->state;
+    }
+    
+  if (state & GDK_BUTTON1_MASK && pixmap != NULL)
+    draw_brush (widget, x, y);
+  
+  return TRUE;
+}
+
+void
+quit ()
+{
+  gtk_exit (0);
+}
+
+int
+main (int argc, char *argv[])
+{
+  GtkWidget *window;
+  GtkWidget *drawing_area;
+  GtkWidget *vbox;
+
+  GtkWidget *button;
+
+  gtk_init (&argc, &argv);
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_widget_set_name (window, "Test Input");
+
+  vbox = gtk_vbox_new (FALSE, 0);
+  gtk_container_add (GTK_CONTAINER (window), vbox);
+  gtk_widget_show (vbox);
+
+  gtk_signal_connect (GTK_OBJECT (window), "destroy",
+		      GTK_SIGNAL_FUNC (quit), NULL);
+
+  /* Create the drawing area */
+
+  drawing_area = gtk_drawing_area_new ();
+  gtk_drawing_area_size (GTK_DRAWING_AREA (drawing_area), 200, 200);
+  gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
+
+  gtk_widget_show (drawing_area);
+
+  /* Signals used to handle backing pixmap */
+
+  gtk_signal_connect (GTK_OBJECT (drawing_area), "expose_event",
+		      (GtkSignalFunc) expose_event, NULL);
+  gtk_signal_connect (GTK_OBJECT(drawing_area),"configure_event",
+		      (GtkSignalFunc) configure_event, NULL);
+
+  /* Event signals */
+
+  gtk_signal_connect (GTK_OBJECT (drawing_area), "motion_notify_event",
+		      (GtkSignalFunc) motion_notify_event, NULL);
+  gtk_signal_connect (GTK_OBJECT (drawing_area), "button_press_event",
+		      (GtkSignalFunc) button_press_event, NULL);
+
+  gtk_widget_set_events (drawing_area, GDK_EXPOSURE_MASK
+			 | GDK_LEAVE_NOTIFY_MASK
+			 | GDK_BUTTON_PRESS_MASK
+			 | GDK_POINTER_MOTION_MASK
+			 | GDK_POINTER_MOTION_HINT_MASK);
+
+  /* .. And a quit button */
+  button = gtk_button_new_with_label ("Quit");
+  gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
+
+  gtk_signal_connect_object (GTK_OBJECT (button), "clicked",
+			     GTK_SIGNAL_FUNC (gtk_widget_destroy),
+			     GTK_OBJECT (window));
+  gtk_widget_show (button);
+
+  gtk_widget_show (window);
+
+  gtk_main ();
+
+  return 0;
+}