/* 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 Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include <stdio.h>
#include "gtk/gtk.h"
#include <math.h>
/* Backing surface for drawing area */
static cairo_surface_t *surface = NULL;
/* Information about cursor */
static gint cursor_proximity = TRUE;
static gdouble cursor_x;
static gdouble cursor_y;
/* Unique ID of current device */
static GdkDevice *current_device;
/* Erase the old cursor, and/or draw a new one, if necessary */
static void
update_cursor (GtkWidget *widget, gdouble x, gdouble y)
{
static gint cursor_present = 0;
gint state = !gdk_device_get_has_cursor (current_device) && cursor_proximity;
x = floor (x);
y = floor (y);
if (surface != NULL)
{
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
cairo_t *cr = gdk_cairo_create (gtk_widget_get_window (widget));
G_GNUC_END_IGNORE_DEPRECATIONS
if (cursor_present && (cursor_present != state ||
x != cursor_x || y != cursor_y))
{
cairo_set_source_surface (cr, surface, 0, 0);
cairo_rectangle (cr, cursor_x - 5, cursor_y - 5, 10, 10);
cairo_fill (cr);
}
cursor_present = state;
cursor_x = x;
cursor_y = y;
if (cursor_present)
{
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_rectangle (cr,
cursor_x - 5, cursor_y -5,
10, 10);
cairo_fill (cr);
}
cairo_destroy (cr);
}
}
/* Create a new backing surface of the appropriate size */
static gint
configure_event (GtkWidget *widget, GdkEventConfigure *event)
{
GtkAllocation allocation;
cairo_t *cr;
if (surface)
cairo_surface_destroy (surface);
gtk_widget_get_allocation (widget, &allocation);
surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
CAIRO_CONTENT_COLOR,
allocation.width,
allocation.height);
cr = cairo_create (surface);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_destroy (cr);
return TRUE;
}
/* Refill the screen from the backing surface */
static gboolean
draw (GtkWidget *widget, cairo_t *cr)
{
cairo_set_source_surface (cr, surface, 0, 0);
cairo_paint (cr);
return FALSE;
}
/* Draw a rectangle on the screen, size depending on pressure,
and color on the type of device */
static void
draw_brush (GtkWidget *widget, GdkInputSource source,
gdouble x, gdouble y, gdouble pressure)
{
GdkRGBA color;
GdkRectangle update_rect;
cairo_t *cr;
color.alpha = 1.0;
switch (source)
{
case GDK_SOURCE_MOUSE:
color.red = color.green = 0.0;
color.blue = 1.0;
break;
case GDK_SOURCE_PEN:
color.red = color.green = color.blue = 0.0;
break;
case GDK_SOURCE_ERASER:
color.red = color.green = color.blue = 1.0;
break;
default:
color.red = color.blue = 0.0;
color.green = 1.0;
}
update_rect.x = x - 10 * pressure;
update_rect.y = y - 10 * pressure;
update_rect.width = 20 * pressure;
update_rect.height = 20 * pressure;
cr = cairo_create (surface);
gdk_cairo_set_source_rgba (cr, &color);
gdk_cairo_rectangle (cr, &update_rect);
cairo_fill (cr);
cairo_destroy (cr);
gtk_widget_queue_draw_area (widget,
update_rect.x, update_rect.y,
update_rect.width, update_rect.height);
gdk_window_process_updates (gtk_widget_get_window (widget), TRUE);
}
static guint32 motion_time;
static void
print_axes (GdkDevice *device, gdouble *axes)
{
int i;
if (axes)
{
g_print ("%s ", gdk_device_get_name (device));
for (i = 0; i < gdk_device_get_n_axes (device); i++)
g_print ("%g ", axes[i]);
g_print ("\n");
}
}
static gint
button_press_event (GtkWidget *widget, GdkEventButton *event)
{
current_device = event->device;
cursor_proximity = TRUE;
if (event->button == GDK_BUTTON_PRIMARY &&
surface != NULL)
{
gdouble pressure = 0.5;
print_axes (event->device, event->axes);
gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
draw_brush (widget, gdk_device_get_source (event->device),
event->x, event->y, pressure);
motion_time = event->time;
}
update_cursor (widget, event->x, event->y);
return TRUE;
}
static gint
key_press_event (GtkWidget *widget, GdkEventKey *event)
{
if ((event->keyval >= 0x20) && (event->keyval <= 0xFF))
printf("I got a %c\n", event->keyval);
else
printf("I got some other key\n");
return TRUE;
}
static gint
motion_notify_event (GtkWidget *widget, GdkEventMotion *event)
{
GdkTimeCoord **events;
gint n_events;
int i;
current_device = event->device;
cursor_proximity = TRUE;
if (event->state & GDK_BUTTON1_MASK && surface != NULL)
{
if (gdk_device_get_history (event->device, event->window,
motion_time, event->time,
&events, &n_events))
{
for (i=0; i<n_events; i++)
{
double x = 0, y = 0, pressure = 0.5;
gdk_device_get_axis (event->device, events[i]->axes, GDK_AXIS_X, &x);
gdk_device_get_axis (event->device, events[i]->axes, GDK_AXIS_Y, &y);
gdk_device_get_axis (event->device, events[i]->axes, GDK_AXIS_PRESSURE, &pressure);
draw_brush (widget, gdk_device_get_source (event->device),
x, y, pressure);
print_axes (event->device, events[i]->axes);
}
gdk_device_free_history (events, n_events);
}
else
{
double pressure = 0.5;
gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
draw_brush (widget, gdk_device_get_source (event->device),
event->x, event->y, pressure);
}
motion_time = event->time;
}
print_axes (event->device, event->axes);
update_cursor (widget, event->x, event->y);
return TRUE;
}
/* We track the next two events to know when we need to draw a
cursor */
static gint
proximity_out_event (GtkWidget *widget, GdkEventProximity *event)
{
cursor_proximity = FALSE;
update_cursor (widget, cursor_x, cursor_y);
return TRUE;
}
static gint
leave_notify_event (GtkWidget *widget, GdkEventCrossing *event)
{
cursor_proximity = FALSE;
update_cursor (widget, cursor_x, cursor_y);
return TRUE;
}
void
quit (void)
{
gtk_main_quit ();
}
int
main (int argc, char *argv[])
{
GList *devices, *d;
GdkEventMask event_mask;
GtkWidget *window;
GtkWidget *drawing_area;
GtkWidget *vbox;
GtkWidget *button;
GdkWindow *gdk_win;
GdkSeat *seat;
gtk_init (&argc, &argv);
seat = gdk_display_get_default_seat (gdk_display_get_default ());
current_device = gdk_seat_get_pointer (seat);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_widget_set_name (window, "Test Input");
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_container_add (GTK_CONTAINER (window), vbox);
gtk_widget_show (vbox);
g_signal_connect (window, "destroy",
G_CALLBACK (quit), NULL);
/* Create the drawing area */
drawing_area = gtk_drawing_area_new ();
gtk_widget_set_size_request (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 surface */
g_signal_connect (drawing_area, "draw",
G_CALLBACK (draw), NULL);
g_signal_connect (drawing_area, "configure_event",
G_CALLBACK (configure_event), NULL);
/* Event signals */
g_signal_connect (drawing_area, "motion_notify_event",
G_CALLBACK (motion_notify_event), NULL);
g_signal_connect (drawing_area, "button_press_event",
G_CALLBACK (button_press_event), NULL);
g_signal_connect (drawing_area, "key_press_event",
G_CALLBACK (key_press_event), NULL);
g_signal_connect (drawing_area, "leave_notify_event",
G_CALLBACK (leave_notify_event), NULL);
g_signal_connect (drawing_area, "proximity_out_event",
G_CALLBACK (proximity_out_event), NULL);
event_mask = GDK_EXPOSURE_MASK |
GDK_LEAVE_NOTIFY_MASK |
GDK_BUTTON_PRESS_MASK |
GDK_KEY_PRESS_MASK |
GDK_POINTER_MOTION_MASK |
GDK_PROXIMITY_OUT_MASK;
gtk_widget_set_events (drawing_area, event_mask);
devices = gdk_seat_get_slaves (seat, GDK_SEAT_CAPABILITY_ALL_POINTING);
for (d = devices; d; d = d->next)
{
GdkDevice *device;
device = d->data;
gtk_widget_set_device_events (drawing_area, device, event_mask);
gdk_device_set_mode (device, GDK_MODE_SCREEN);
}
g_list_free (devices);
gtk_widget_set_can_focus (drawing_area, TRUE);
gtk_widget_grab_focus (drawing_area);
/* .. And create some buttons */
button = gtk_button_new_with_label ("Quit");
gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
g_signal_connect_swapped (button, "clicked",
G_CALLBACK (gtk_widget_destroy),
window);
gtk_widget_show (button);
gtk_widget_show (window);
/* request all motion events */
gdk_win = gtk_widget_get_window (drawing_area);
gdk_window_set_event_compression (gdk_win, FALSE);
gtk_main ();
return 0;
}