+++ /dev/null
-/* 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,
- gpointer data)
-{
- if (surface)
- {
- cairo_surface_destroy (surface);
- surface = NULL;
- }
-
- if (gtk_widget_get_surface (widget))
- {
- cairo_t *cr;
-
- surface = gdk_surface_create_similar_surface (gtk_widget_get_surface (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 (widget);
-}
-
-static guint32 motion_time;
-
-static const char *
-device_source_name (GdkDevice *device)
-{
- static const struct {GdkInputSource source; const char *name;} sources[] =
- {
- {GDK_SOURCE_MOUSE, "mouse"},
- {GDK_SOURCE_PEN, "pen"},
- {GDK_SOURCE_ERASER, "eraser"},
- {GDK_SOURCE_CURSOR, "cursor"},
- {GDK_SOURCE_KEYBOARD, "keyboard"},
- {GDK_SOURCE_TOUCHSCREEN, "touchscreen"},
- {GDK_SOURCE_TOUCHPAD, "touchpad"},
- {GDK_SOURCE_TRACKPOINT, "trackpoint"},
- {GDK_SOURCE_TABLET_PAD, "tablet pad"},
- };
- GdkInputSource source = gdk_device_get_source (device);
- int s;
-
- for (s = 0; s < G_N_ELEMENTS (sources); ++s)
- if (sources[s].source == source)
- return sources[s].name;
-
- return "unknown";
-}
-
-static void
-print_axes (GdkEvent *event)
-{
- gdouble *axes;
- guint n_axes;
-
- gdk_event_get_axes (event, &axes, &n_axes);
-
- if (axes)
- {
- GdkDevice *device = gdk_event_get_device (event);
- GdkDevice *source = gdk_event_get_source_device (event);
- int i;
-
- g_print ("%s (%s) via %s (%s): ",
- gdk_device_get_name (device),
- device_source_name (device),
- gdk_device_get_name (source),
- device_source_name (source));
-
- 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 x, y;
- GdkEvent *event;
-
- event = gtk_get_current_event ();
- device = gdk_event_get_device (event);
- gdk_event_get_coords (event, &x, &y);
-
- print_axes (event);
- 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;
- GdkEvent *event;
- 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);
- }
-
- print_axes (event);
-}
-
-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 ();
- 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);
- gtk_widget_add_controller (drawing_area, GTK_EVENT_CONTROLLER (gesture));
-
- 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;
-}
projects / gtk4.git / commitdiff