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, see <http://www.gnu.org/licenses/>.
19 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
20 * file for a list of people on the GTK+ Team. See the ChangeLog
21 * files for a list of changes. These files are distributed with
22 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
29 /* Backing surface for drawing area */
31 static cairo_surface_t *surface = NULL;
33 /* Information about cursor */
35 static gint cursor_proximity = TRUE;
36 static gdouble cursor_x;
37 static gdouble cursor_y;
39 /* Unique ID of current device */
40 static GdkDevice *current_device;
42 /* Erase the old cursor, and/or draw a new one, if necessary */
44 update_cursor (GtkWidget *widget, gdouble x, gdouble y)
46 static gint cursor_present = 0;
47 gint state = !gdk_device_get_has_cursor (current_device) && cursor_proximity;
51 cairo_t *cr = gdk_cairo_create (gtk_widget_get_window (widget));
53 if (cursor_present && (cursor_present != state ||
54 x != cursor_x || y != cursor_y))
56 cairo_set_source_surface (cr, surface, 0, 0);
57 cairo_rectangle (cr, cursor_x - 5, cursor_y - 5, 10, 10);
61 cursor_present = state;
67 cairo_set_source_rgb (cr, 0, 0, 0);
69 cursor_x - 5, cursor_y -5,
78 /* Create a new backing surface of the appropriate size */
80 configure_event (GtkWidget *widget, GdkEventConfigure *event)
82 GtkAllocation allocation;
86 cairo_surface_destroy (surface);
88 gtk_widget_get_allocation (widget, &allocation);
90 surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
94 cr = cairo_create (surface);
96 cairo_set_source_rgb (cr, 1, 1, 1);
104 /* Refill the screen from the backing surface */
106 draw (GtkWidget *widget, cairo_t *cr)
108 cairo_set_source_surface (cr, surface, 0, 0);
114 /* Draw a rectangle on the screen, size depending on pressure,
115 and color on the type of device */
117 draw_brush (GtkWidget *widget, GdkInputSource source,
118 gdouble x, gdouble y, gdouble pressure)
121 GdkRectangle update_rect;
128 case GDK_SOURCE_MOUSE:
129 color.red = color.green = 0.0;
133 color.red = color.green = color.blue = 0.0;
135 case GDK_SOURCE_ERASER:
136 color.red = color.green = color.blue = 1.0;
139 color.red = color.blue = 0.0;
143 update_rect.x = x - 10 * pressure;
144 update_rect.y = y - 10 * pressure;
145 update_rect.width = 20 * pressure;
146 update_rect.height = 20 * pressure;
148 cr = cairo_create (surface);
149 gdk_cairo_set_source_rgba (cr, &color);
150 gdk_cairo_rectangle (cr, &update_rect);
154 gtk_widget_queue_draw_area (widget,
155 update_rect.x, update_rect.y,
156 update_rect.width, update_rect.height);
157 gdk_window_process_updates (gtk_widget_get_window (widget), TRUE);
160 static guint32 motion_time;
163 print_axes (GdkDevice *device, gdouble *axes)
169 g_print ("%s ", gdk_device_get_name (device));
171 for (i = 0; i < gdk_device_get_n_axes (device); i++)
172 g_print ("%g ", axes[i]);
179 button_press_event (GtkWidget *widget, GdkEventButton *event)
181 current_device = event->device;
182 cursor_proximity = TRUE;
184 if (event->button == 1 && surface != NULL)
186 gdouble pressure = 0.5;
188 print_axes (event->device, event->axes);
189 gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
190 draw_brush (widget, gdk_device_get_source (event->device),
191 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, gdk_device_get_source (event->device),
238 print_axes (event->device, events[i]->axes);
240 gdk_device_free_history (events, n_events);
244 double pressure = 0.5;
246 gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
248 draw_brush (widget, gdk_device_get_source (event->device),
249 event->x, event->y, pressure);
251 motion_time = event->time;
255 gdk_device_get_state (event->device, event->window, NULL, NULL);
257 print_axes (event->device, event->axes);
258 update_cursor (widget, event->x, event->y);
263 /* We track the next two events to know when we need to draw a
267 proximity_out_event (GtkWidget *widget, GdkEventProximity *event)
269 cursor_proximity = FALSE;
270 update_cursor (widget, cursor_x, cursor_y);
275 leave_notify_event (GtkWidget *widget, GdkEventCrossing *event)
277 cursor_proximity = FALSE;
278 update_cursor (widget, cursor_x, cursor_y);
289 main (int argc, char *argv[])
291 GdkDeviceManager *device_manager;
293 GdkEventMask event_mask;
295 GtkWidget *drawing_area;
300 gtk_init (&argc, &argv);
302 device_manager = gdk_display_get_device_manager (gdk_display_get_default ());
303 current_device = gdk_device_manager_get_client_pointer (device_manager);
305 window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
306 gtk_widget_set_name (window, "Test Input");
308 vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
309 gtk_container_add (GTK_CONTAINER (window), vbox);
310 gtk_widget_show (vbox);
312 g_signal_connect (window, "destroy",
313 G_CALLBACK (quit), NULL);
315 /* Create the drawing area */
317 drawing_area = gtk_drawing_area_new ();
318 gtk_widget_set_size_request (drawing_area, 200, 200);
319 gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
321 gtk_widget_show (drawing_area);
323 /* Signals used to handle backing surface */
325 g_signal_connect (drawing_area, "draw",
326 G_CALLBACK (draw), NULL);
327 g_signal_connect (drawing_area, "configure_event",
328 G_CALLBACK (configure_event), NULL);
332 g_signal_connect (drawing_area, "motion_notify_event",
333 G_CALLBACK (motion_notify_event), NULL);
334 g_signal_connect (drawing_area, "button_press_event",
335 G_CALLBACK (button_press_event), NULL);
336 g_signal_connect (drawing_area, "key_press_event",
337 G_CALLBACK (key_press_event), NULL);
339 g_signal_connect (drawing_area, "leave_notify_event",
340 G_CALLBACK (leave_notify_event), NULL);
341 g_signal_connect (drawing_area, "proximity_out_event",
342 G_CALLBACK (proximity_out_event), NULL);
344 event_mask = GDK_EXPOSURE_MASK |
345 GDK_LEAVE_NOTIFY_MASK |
346 GDK_BUTTON_PRESS_MASK |
348 GDK_POINTER_MOTION_MASK |
349 GDK_POINTER_MOTION_HINT_MASK |
350 GDK_PROXIMITY_OUT_MASK;
352 gtk_widget_set_events (drawing_area, event_mask);
354 devices = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_FLOATING);
356 for (d = devices; d; d = d->next)
361 gtk_widget_set_device_events (drawing_area, device, event_mask);
362 gdk_device_set_mode (device, GDK_MODE_SCREEN);
365 g_list_free (devices);
367 gtk_widget_set_can_focus (drawing_area, TRUE);
368 gtk_widget_grab_focus (drawing_area);
370 /* .. And create some buttons */
371 button = gtk_button_new_with_label ("Quit");
372 gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
374 g_signal_connect_swapped (button, "clicked",
375 G_CALLBACK (gtk_widget_destroy),
377 gtk_widget_show (button);
379 gtk_widget_show (window);