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/.
30 /* Backing surface for drawing area */
32 static cairo_surface_t *surface = NULL;
34 /* Information about cursor */
36 static gint cursor_proximity = TRUE;
37 static gdouble cursor_x;
38 static gdouble cursor_y;
40 /* Unique ID of current device */
41 static GdkDevice *current_device;
43 /* Erase the old cursor, and/or draw a new one, if necessary */
45 update_cursor (GtkWidget *widget, gdouble x, gdouble y)
47 static gint cursor_present = 0;
48 gint state = !gdk_device_get_has_cursor (current_device) && cursor_proximity;
55 cairo_t *cr = gdk_cairo_create (gtk_widget_get_window (widget));
57 if (cursor_present && (cursor_present != state ||
58 x != cursor_x || y != cursor_y))
60 cairo_set_source_surface (cr, surface, 0, 0);
61 cairo_rectangle (cr, cursor_x - 5, cursor_y - 5, 10, 10);
65 cursor_present = state;
71 cairo_set_source_rgb (cr, 0, 0, 0);
73 cursor_x - 5, cursor_y -5,
82 /* Create a new backing surface of the appropriate size */
84 configure_event (GtkWidget *widget, GdkEventConfigure *event)
86 GtkAllocation allocation;
90 cairo_surface_destroy (surface);
92 gtk_widget_get_allocation (widget, &allocation);
94 surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
98 cr = cairo_create (surface);
100 cairo_set_source_rgb (cr, 1, 1, 1);
108 /* Refill the screen from the backing surface */
110 draw (GtkWidget *widget, cairo_t *cr)
112 cairo_set_source_surface (cr, surface, 0, 0);
118 /* Draw a rectangle on the screen, size depending on pressure,
119 and color on the type of device */
121 draw_brush (GtkWidget *widget, GdkInputSource source,
122 gdouble x, gdouble y, gdouble pressure)
125 GdkRectangle update_rect;
132 case GDK_SOURCE_MOUSE:
133 color.red = color.green = 0.0;
137 color.red = color.green = color.blue = 0.0;
139 case GDK_SOURCE_ERASER:
140 color.red = color.green = color.blue = 1.0;
143 color.red = color.blue = 0.0;
147 update_rect.x = x - 10 * pressure;
148 update_rect.y = y - 10 * pressure;
149 update_rect.width = 20 * pressure;
150 update_rect.height = 20 * pressure;
152 cr = cairo_create (surface);
153 gdk_cairo_set_source_rgba (cr, &color);
154 gdk_cairo_rectangle (cr, &update_rect);
158 gtk_widget_queue_draw_area (widget,
159 update_rect.x, update_rect.y,
160 update_rect.width, update_rect.height);
161 gdk_window_process_updates (gtk_widget_get_window (widget), TRUE);
164 static guint32 motion_time;
167 print_axes (GdkDevice *device, gdouble *axes)
173 g_print ("%s ", gdk_device_get_name (device));
175 for (i = 0; i < gdk_device_get_n_axes (device); i++)
176 g_print ("%g ", axes[i]);
183 button_press_event (GtkWidget *widget, GdkEventButton *event)
185 current_device = event->device;
186 cursor_proximity = TRUE;
188 if (event->button == GDK_BUTTON_PRIMARY &&
191 gdouble pressure = 0.5;
193 print_axes (event->device, event->axes);
194 gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
195 draw_brush (widget, gdk_device_get_source (event->device),
196 event->x, event->y, pressure);
198 motion_time = event->time;
201 update_cursor (widget, event->x, event->y);
207 key_press_event (GtkWidget *widget, GdkEventKey *event)
209 if ((event->keyval >= 0x20) && (event->keyval <= 0xFF))
210 printf("I got a %c\n", event->keyval);
212 printf("I got some other key\n");
218 motion_notify_event (GtkWidget *widget, GdkEventMotion *event)
220 GdkTimeCoord **events;
224 current_device = event->device;
225 cursor_proximity = TRUE;
227 if (event->state & GDK_BUTTON1_MASK && surface != NULL)
229 if (gdk_device_get_history (event->device, event->window,
230 motion_time, event->time,
233 for (i=0; i<n_events; i++)
235 double x = 0, y = 0, pressure = 0.5;
237 gdk_device_get_axis (event->device, events[i]->axes, GDK_AXIS_X, &x);
238 gdk_device_get_axis (event->device, events[i]->axes, GDK_AXIS_Y, &y);
239 gdk_device_get_axis (event->device, events[i]->axes, GDK_AXIS_PRESSURE, &pressure);
240 draw_brush (widget, gdk_device_get_source (event->device),
243 print_axes (event->device, events[i]->axes);
245 gdk_device_free_history (events, n_events);
249 double pressure = 0.5;
251 gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
253 draw_brush (widget, gdk_device_get_source (event->device),
254 event->x, event->y, pressure);
256 motion_time = event->time;
260 gdk_device_get_state (event->device, event->window, NULL, NULL);
262 print_axes (event->device, event->axes);
263 update_cursor (widget, event->x, event->y);
268 /* We track the next two events to know when we need to draw a
272 proximity_out_event (GtkWidget *widget, GdkEventProximity *event)
274 cursor_proximity = FALSE;
275 update_cursor (widget, cursor_x, cursor_y);
280 leave_notify_event (GtkWidget *widget, GdkEventCrossing *event)
282 cursor_proximity = FALSE;
283 update_cursor (widget, cursor_x, cursor_y);
294 main (int argc, char *argv[])
296 GdkDeviceManager *device_manager;
298 GdkEventMask event_mask;
300 GtkWidget *drawing_area;
305 gtk_init (&argc, &argv);
307 device_manager = gdk_display_get_device_manager (gdk_display_get_default ());
308 current_device = gdk_device_manager_get_client_pointer (device_manager);
310 window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
311 gtk_widget_set_name (window, "Test Input");
313 vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
314 gtk_container_add (GTK_CONTAINER (window), vbox);
315 gtk_widget_show (vbox);
317 g_signal_connect (window, "destroy",
318 G_CALLBACK (quit), NULL);
320 /* Create the drawing area */
322 drawing_area = gtk_drawing_area_new ();
323 gtk_widget_set_size_request (drawing_area, 200, 200);
324 gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
326 gtk_widget_show (drawing_area);
328 /* Signals used to handle backing surface */
330 g_signal_connect (drawing_area, "draw",
331 G_CALLBACK (draw), NULL);
332 g_signal_connect (drawing_area, "configure_event",
333 G_CALLBACK (configure_event), NULL);
337 g_signal_connect (drawing_area, "motion_notify_event",
338 G_CALLBACK (motion_notify_event), NULL);
339 g_signal_connect (drawing_area, "button_press_event",
340 G_CALLBACK (button_press_event), NULL);
341 g_signal_connect (drawing_area, "key_press_event",
342 G_CALLBACK (key_press_event), NULL);
344 g_signal_connect (drawing_area, "leave_notify_event",
345 G_CALLBACK (leave_notify_event), NULL);
346 g_signal_connect (drawing_area, "proximity_out_event",
347 G_CALLBACK (proximity_out_event), NULL);
349 event_mask = GDK_EXPOSURE_MASK |
350 GDK_LEAVE_NOTIFY_MASK |
351 GDK_BUTTON_PRESS_MASK |
353 GDK_POINTER_MOTION_MASK |
354 GDK_POINTER_MOTION_HINT_MASK |
355 GDK_PROXIMITY_OUT_MASK;
357 gtk_widget_set_events (drawing_area, event_mask);
359 devices = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_FLOATING);
361 for (d = devices; d; d = d->next)
366 gtk_widget_set_device_events (drawing_area, device, event_mask);
367 gdk_device_set_mode (device, GDK_MODE_SCREEN);
370 g_list_free (devices);
372 gtk_widget_set_can_focus (drawing_area, TRUE);
373 gtk_widget_grab_focus (drawing_area);
375 /* .. And create some buttons */
376 button = gtk_button_new_with_label ("Quit");
377 gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
379 g_signal_connect_swapped (button, "clicked",
380 G_CALLBACK (gtk_widget_destroy),
382 gtk_widget_show (button);
384 gtk_widget_show (window);