1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
22 * file for a list of people on the GTK+ Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
31 /* Backing surface for drawing area */
33 static cairo_surface_t *surface = NULL;
35 /* Information about cursor */
37 static gint cursor_proximity = TRUE;
38 static gdouble cursor_x;
39 static gdouble cursor_y;
41 /* Unique ID of current device */
42 static GdkDevice *current_device;
44 /* Erase the old cursor, and/or draw a new one, if necessary */
46 update_cursor (GtkWidget *widget, gdouble x, gdouble y)
48 static gint cursor_present = 0;
49 gint state = !current_device->has_cursor && cursor_proximity;
53 cairo_t *cr = gdk_cairo_create (gtk_widget_get_window (widget));
55 if (cursor_present && (cursor_present != state ||
56 x != cursor_x || y != cursor_y))
58 cairo_set_source_surface (cr, surface, 0, 0);
59 cairo_rectangle (cr, cursor_x - 5, cursor_y - 5, 10, 10);
63 cursor_present = state;
69 cairo_set_source_rgb (cr, 0, 0, 0);
71 cursor_x - 5, cursor_y -5,
80 /* Create a new backing surface of the appropriate size */
82 configure_event (GtkWidget *widget, GdkEventConfigure *event)
84 GtkAllocation allocation;
88 cairo_surface_destroy (surface);
90 gtk_widget_get_allocation (widget, &allocation);
92 surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
96 cr = cairo_create (surface);
98 cairo_set_source_rgb (cr, 1, 1, 1);
106 /* Refill the screen from the backing surface */
108 draw (GtkWidget *widget, cairo_t *cr)
110 cairo_set_source_surface (cr, surface, 0, 0);
116 /* Draw a rectangle on the screen, size depending on pressure,
117 and color on the type of device */
119 draw_brush (GtkWidget *widget, GdkInputSource source,
120 gdouble x, gdouble y, gdouble pressure)
124 GdkRectangle update_rect;
127 style = gtk_widget_get_style (widget);
131 case GDK_SOURCE_MOUSE:
132 color = style->dark[gtk_widget_get_state (widget)];
135 color.red = color.green = color.blue = 0;
137 case GDK_SOURCE_ERASER:
138 color.red = color.green = color.blue = 65535;
141 color = style->light[gtk_widget_get_state (widget)];
144 update_rect.x = x - 10 * pressure;
145 update_rect.y = y - 10 * pressure;
146 update_rect.width = 20 * pressure;
147 update_rect.height = 20 * pressure;
149 cr = cairo_create (surface);
150 gdk_cairo_set_source_color (cr, &color);
151 gdk_cairo_rectangle (cr, &update_rect);
155 gtk_widget_queue_draw_area (widget,
156 update_rect.x, update_rect.y,
157 update_rect.width, update_rect.height);
158 gdk_window_process_updates (gtk_widget_get_window (widget), TRUE);
161 static guint32 motion_time;
164 print_axes (GdkDevice *device, gdouble *axes)
170 g_print ("%s ", device->name);
172 for (i=0; i<device->num_axes; i++)
173 g_print ("%g ", axes[i]);
180 button_press_event (GtkWidget *widget, GdkEventButton *event)
182 current_device = event->device;
183 cursor_proximity = TRUE;
185 if (event->button == 1 && surface != NULL)
187 gdouble pressure = 0.5;
189 print_axes (event->device, event->axes);
190 gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
191 draw_brush (widget, event->device->source, event->x, event->y, pressure);
193 motion_time = event->time;
196 update_cursor (widget, event->x, event->y);
202 key_press_event (GtkWidget *widget, GdkEventKey *event)
204 if ((event->keyval >= 0x20) && (event->keyval <= 0xFF))
205 printf("I got a %c\n", event->keyval);
207 printf("I got some other key\n");
213 motion_notify_event (GtkWidget *widget, GdkEventMotion *event)
215 GdkTimeCoord **events;
219 current_device = event->device;
220 cursor_proximity = TRUE;
222 if (event->state & GDK_BUTTON1_MASK && surface != NULL)
224 if (gdk_device_get_history (event->device, event->window,
225 motion_time, event->time,
228 for (i=0; i<n_events; i++)
230 double x = 0, y = 0, pressure = 0.5;
232 gdk_device_get_axis (event->device, events[i]->axes, GDK_AXIS_X, &x);
233 gdk_device_get_axis (event->device, events[i]->axes, GDK_AXIS_Y, &y);
234 gdk_device_get_axis (event->device, events[i]->axes, GDK_AXIS_PRESSURE, &pressure);
235 draw_brush (widget, event->device->source, x, y, pressure);
237 print_axes (event->device, events[i]->axes);
239 gdk_device_free_history (events, n_events);
243 double pressure = 0.5;
245 gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
247 draw_brush (widget, event->device->source, event->x, event->y, pressure);
249 motion_time = event->time;
253 gdk_device_get_state (event->device, event->window, NULL, NULL);
255 print_axes (event->device, event->axes);
256 update_cursor (widget, event->x, event->y);
261 /* We track the next two events to know when we need to draw a
265 proximity_out_event (GtkWidget *widget, GdkEventProximity *event)
267 cursor_proximity = FALSE;
268 update_cursor (widget, cursor_x, cursor_y);
273 leave_notify_event (GtkWidget *widget, GdkEventCrossing *event)
275 cursor_proximity = FALSE;
276 update_cursor (widget, cursor_x, cursor_y);
287 main (int argc, char *argv[])
289 GdkDeviceManager *device_manager;
291 GdkEventMask event_mask;
293 GtkWidget *drawing_area;
298 gtk_init (&argc, &argv);
300 device_manager = gdk_display_get_device_manager (gdk_display_get_default ());
301 current_device = gdk_device_manager_get_client_pointer (device_manager);
303 window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
304 gtk_widget_set_name (window, "Test Input");
306 vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
307 gtk_container_add (GTK_CONTAINER (window), vbox);
308 gtk_widget_show (vbox);
310 g_signal_connect (window, "destroy",
311 G_CALLBACK (quit), NULL);
313 /* Create the drawing area */
315 drawing_area = gtk_drawing_area_new ();
316 gtk_widget_set_size_request (drawing_area, 200, 200);
317 gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
319 gtk_widget_show (drawing_area);
321 /* Signals used to handle backing surface */
323 g_signal_connect (drawing_area, "draw",
324 G_CALLBACK (draw), NULL);
325 g_signal_connect (drawing_area, "configure_event",
326 G_CALLBACK (configure_event), NULL);
330 g_signal_connect (drawing_area, "motion_notify_event",
331 G_CALLBACK (motion_notify_event), NULL);
332 g_signal_connect (drawing_area, "button_press_event",
333 G_CALLBACK (button_press_event), NULL);
334 g_signal_connect (drawing_area, "key_press_event",
335 G_CALLBACK (key_press_event), NULL);
337 g_signal_connect (drawing_area, "leave_notify_event",
338 G_CALLBACK (leave_notify_event), NULL);
339 g_signal_connect (drawing_area, "proximity_out_event",
340 G_CALLBACK (proximity_out_event), NULL);
342 event_mask = GDK_EXPOSURE_MASK |
343 GDK_LEAVE_NOTIFY_MASK |
344 GDK_BUTTON_PRESS_MASK |
346 GDK_POINTER_MOTION_MASK |
347 GDK_POINTER_MOTION_HINT_MASK |
348 GDK_PROXIMITY_OUT_MASK;
350 gtk_widget_set_events (drawing_area, event_mask);
352 devices = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_FLOATING);
354 for (d = devices; d; d = d->next)
359 gtk_widget_set_device_events (drawing_area, device, event_mask);
360 gdk_device_set_mode (device, GDK_MODE_SCREEN);
363 g_list_free (devices);
365 gtk_widget_set_can_focus (drawing_area, TRUE);
366 gtk_widget_grab_focus (drawing_area);
368 /* .. And create some buttons */
369 button = gtk_button_new_with_label ("Quit");
370 gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
372 g_signal_connect_swapped (button, "clicked",
373 G_CALLBACK (gtk_widget_destroy),
375 gtk_widget_show (button);
377 gtk_widget_show (window);