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 = !gdk_device_get_has_cursor (current_device) && 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)
123 GdkRectangle update_rect;
130 case GDK_SOURCE_MOUSE:
131 color.red = color.green = 0.0;
135 color.red = color.green = color.blue = 0.0;
137 case GDK_SOURCE_ERASER:
138 color.red = color.green = color.blue = 1.0;
141 color.red = color.blue = 0.0;
145 update_rect.x = x - 10 * pressure;
146 update_rect.y = y - 10 * pressure;
147 update_rect.width = 20 * pressure;
148 update_rect.height = 20 * pressure;
150 cr = cairo_create (surface);
151 gdk_cairo_set_source_rgba (cr, &color);
152 gdk_cairo_rectangle (cr, &update_rect);
156 gtk_widget_queue_draw_area (widget,
157 update_rect.x, update_rect.y,
158 update_rect.width, update_rect.height);
159 gdk_window_process_updates (gtk_widget_get_window (widget), TRUE);
162 static guint32 motion_time;
165 print_axes (GdkDevice *device, gdouble *axes)
171 g_print ("%s ", gdk_device_get_name (device));
173 for (i = 0; i < gdk_device_get_n_axes (device); i++)
174 g_print ("%g ", axes[i]);
181 button_press_event (GtkWidget *widget, GdkEventButton *event)
183 current_device = event->device;
184 cursor_proximity = TRUE;
186 if (event->button == 1 && surface != NULL)
188 gdouble pressure = 0.5;
190 print_axes (event->device, event->axes);
191 gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
192 draw_brush (widget, gdk_device_get_source (event->device),
193 event->x, event->y, pressure);
195 motion_time = event->time;
198 update_cursor (widget, event->x, event->y);
204 key_press_event (GtkWidget *widget, GdkEventKey *event)
206 if ((event->keyval >= 0x20) && (event->keyval <= 0xFF))
207 printf("I got a %c\n", event->keyval);
209 printf("I got some other key\n");
215 motion_notify_event (GtkWidget *widget, GdkEventMotion *event)
217 GdkTimeCoord **events;
221 current_device = event->device;
222 cursor_proximity = TRUE;
224 if (event->state & GDK_BUTTON1_MASK && surface != NULL)
226 if (gdk_device_get_history (event->device, event->window,
227 motion_time, event->time,
230 for (i=0; i<n_events; i++)
232 double x = 0, y = 0, pressure = 0.5;
234 gdk_device_get_axis (event->device, events[i]->axes, GDK_AXIS_X, &x);
235 gdk_device_get_axis (event->device, events[i]->axes, GDK_AXIS_Y, &y);
236 gdk_device_get_axis (event->device, events[i]->axes, GDK_AXIS_PRESSURE, &pressure);
237 draw_brush (widget, gdk_device_get_source (event->device),
240 print_axes (event->device, events[i]->axes);
242 gdk_device_free_history (events, n_events);
246 double pressure = 0.5;
248 gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
250 draw_brush (widget, gdk_device_get_source (event->device),
251 event->x, event->y, pressure);
253 motion_time = event->time;
257 gdk_device_get_state (event->device, event->window, NULL, NULL);
259 print_axes (event->device, event->axes);
260 update_cursor (widget, event->x, event->y);
265 /* We track the next two events to know when we need to draw a
269 proximity_out_event (GtkWidget *widget, GdkEventProximity *event)
271 cursor_proximity = FALSE;
272 update_cursor (widget, cursor_x, cursor_y);
277 leave_notify_event (GtkWidget *widget, GdkEventCrossing *event)
279 cursor_proximity = FALSE;
280 update_cursor (widget, cursor_x, cursor_y);
291 main (int argc, char *argv[])
293 GdkDeviceManager *device_manager;
295 GdkEventMask event_mask;
297 GtkWidget *drawing_area;
302 gtk_init (&argc, &argv);
304 device_manager = gdk_display_get_device_manager (gdk_display_get_default ());
305 current_device = gdk_device_manager_get_client_pointer (device_manager);
307 window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
308 gtk_widget_set_name (window, "Test Input");
310 vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
311 gtk_container_add (GTK_CONTAINER (window), vbox);
312 gtk_widget_show (vbox);
314 g_signal_connect (window, "destroy",
315 G_CALLBACK (quit), NULL);
317 /* Create the drawing area */
319 drawing_area = gtk_drawing_area_new ();
320 gtk_widget_set_size_request (drawing_area, 200, 200);
321 gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
323 gtk_widget_show (drawing_area);
325 /* Signals used to handle backing surface */
327 g_signal_connect (drawing_area, "draw",
328 G_CALLBACK (draw), NULL);
329 g_signal_connect (drawing_area, "configure_event",
330 G_CALLBACK (configure_event), NULL);
334 g_signal_connect (drawing_area, "motion_notify_event",
335 G_CALLBACK (motion_notify_event), NULL);
336 g_signal_connect (drawing_area, "button_press_event",
337 G_CALLBACK (button_press_event), NULL);
338 g_signal_connect (drawing_area, "key_press_event",
339 G_CALLBACK (key_press_event), NULL);
341 g_signal_connect (drawing_area, "leave_notify_event",
342 G_CALLBACK (leave_notify_event), NULL);
343 g_signal_connect (drawing_area, "proximity_out_event",
344 G_CALLBACK (proximity_out_event), NULL);
346 event_mask = GDK_EXPOSURE_MASK |
347 GDK_LEAVE_NOTIFY_MASK |
348 GDK_BUTTON_PRESS_MASK |
350 GDK_POINTER_MOTION_MASK |
351 GDK_POINTER_MOTION_HINT_MASK |
352 GDK_PROXIMITY_OUT_MASK;
354 gtk_widget_set_events (drawing_area, event_mask);
356 devices = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_FLOATING);
358 for (d = devices; d; d = d->next)
363 gtk_widget_set_device_events (drawing_area, device, event_mask);
364 gdk_device_set_mode (device, GDK_MODE_SCREEN);
367 g_list_free (devices);
369 gtk_widget_set_can_focus (drawing_area, TRUE);
370 gtk_widget_grab_focus (drawing_area);
372 /* .. And create some buttons */
373 button = gtk_button_new_with_label ("Quit");
374 gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
376 g_signal_connect_swapped (button, "clicked",
377 G_CALLBACK (gtk_widget_destroy),
379 gtk_widget_show (button);
381 gtk_widget_show (window);