mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-11-11 11:20:12 +00:00
287 lines
7.3 KiB
C
287 lines
7.3 KiB
C
/* 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;
|
|
|
|
/* Create a new backing surface of the appropriate size */
|
|
static void
|
|
size_allocate (GtkWidget *widget,
|
|
GtkAllocation *allocation,
|
|
int baseline,
|
|
GdkRectangle *clip,
|
|
gpointer data)
|
|
{
|
|
if (surface)
|
|
{
|
|
cairo_surface_destroy (surface);
|
|
surface = NULL;
|
|
}
|
|
|
|
if (gtk_widget_get_window (widget))
|
|
{
|
|
cairo_t *cr;
|
|
|
|
surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
|
|
CAIRO_CONTENT_COLOR,
|
|
gtk_widget_get_width (widget),
|
|
gtk_widget_get_height (widget));
|
|
cr = cairo_create (surface);
|
|
|
|
cairo_set_source_rgb (cr, 1, 1, 1);
|
|
cairo_paint (cr);
|
|
|
|
cairo_destroy (cr);
|
|
}
|
|
}
|
|
|
|
/* Refill the screen from the backing surface */
|
|
static void
|
|
draw (GtkDrawingArea *drawing_area,
|
|
cairo_t *cr,
|
|
int width,
|
|
int height,
|
|
gpointer data)
|
|
{
|
|
cairo_set_source_surface (cr, surface, 0, 0);
|
|
cairo_paint (cr);
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
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 void
|
|
drag_begin (GtkGesture *gesture,
|
|
double x,
|
|
double y,
|
|
GtkWidget *widget)
|
|
{
|
|
if (surface != NULL)
|
|
{
|
|
gdouble pressure = 0.5;
|
|
GdkDevice *device;
|
|
gdouble *axes;
|
|
guint n_axes;
|
|
gdouble x, y;
|
|
GdkEvent *event;
|
|
|
|
event = gtk_get_current_event ();
|
|
device = gdk_event_get_device (event);
|
|
gdk_event_get_axes (event, &axes, &n_axes);
|
|
gdk_event_get_coords (event, &x, &y);
|
|
|
|
print_axes (device, axes);
|
|
gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &pressure);
|
|
draw_brush (widget, gdk_device_get_source (device), x, y, pressure);
|
|
|
|
motion_time = gdk_event_get_time ((GdkEvent *)event);
|
|
}
|
|
}
|
|
|
|
static gint
|
|
key_press_event (GtkWidget *widget, GdkEventKey *event)
|
|
{
|
|
guint keyval;
|
|
|
|
gdk_event_get_keyval ((GdkEvent*)event, &keyval);
|
|
|
|
if ((keyval >= 0x20) && (keyval <= 0xFF))
|
|
printf("I got a %c\n", keyval);
|
|
else
|
|
printf("I got some other key\n");
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
drag_update (GtkGesture *gesture,
|
|
double x,
|
|
double y,
|
|
GtkWidget *widget)
|
|
{
|
|
GdkModifierType state;
|
|
GdkDevice *device;
|
|
gdouble *axes;
|
|
GdkEvent *event;
|
|
guint n_axes;
|
|
double start_x, start_y;
|
|
|
|
event = gtk_get_current_event ();
|
|
gdk_event_get_state (event, &state);
|
|
device = gdk_event_get_device (event);
|
|
|
|
gtk_gesture_drag_get_start_point (GTK_GESTURE_DRAG (gesture), &start_x, &start_y);
|
|
|
|
if (state & GDK_BUTTON1_MASK && surface != NULL)
|
|
{
|
|
double pressure = 0.5;
|
|
|
|
gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &pressure);
|
|
|
|
draw_brush (widget, gdk_device_get_source (device), start_x + x, start_y + y, pressure);
|
|
|
|
motion_time = gdk_event_get_time (event);
|
|
}
|
|
|
|
gdk_event_get_axes (event, &axes, &n_axes);
|
|
print_axes (device, axes);
|
|
}
|
|
|
|
void
|
|
quit (void)
|
|
{
|
|
gtk_main_quit ();
|
|
}
|
|
|
|
int
|
|
main (int argc, char *argv[])
|
|
{
|
|
GtkWidget *window;
|
|
GtkWidget *drawing_area;
|
|
GtkWidget *vbox;
|
|
GtkWidget *button;
|
|
GtkGesture *gesture;
|
|
|
|
gtk_init ();
|
|
|
|
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_widget_set_vexpand (drawing_area, TRUE);
|
|
gtk_box_pack_start (GTK_BOX (vbox), drawing_area);
|
|
|
|
gtk_widget_show (drawing_area);
|
|
|
|
/* Signals used to handle backing surface */
|
|
|
|
gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (drawing_area), draw, NULL, NULL);
|
|
g_signal_connect (drawing_area, "size-allocate", G_CALLBACK (size_allocate), NULL);
|
|
|
|
gesture = gtk_gesture_drag_new (drawing_area);
|
|
g_object_set_data_full (G_OBJECT (drawing_area), "gesture",
|
|
gesture, g_object_unref);
|
|
g_signal_connect (gesture, "drag-begin",
|
|
G_CALLBACK (drag_begin), drawing_area);
|
|
g_signal_connect (gesture, "drag-update",
|
|
G_CALLBACK (drag_update), drawing_area);
|
|
|
|
g_signal_connect (drawing_area, "key_press_event",
|
|
G_CALLBACK (key_press_event), NULL);
|
|
|
|
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);
|
|
|
|
g_signal_connect_swapped (button, "clicked",
|
|
G_CALLBACK (gtk_widget_destroy),
|
|
window);
|
|
gtk_widget_show (button);
|
|
|
|
gtk_widget_show (window);
|
|
|
|
gtk_main ();
|
|
|
|
return 0;
|
|
}
|