/* 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, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* * 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/. */ #undef GTK_DISABLE_DEPRECATED #include "config.h" #include #include "gtk/gtk.h" /* Backing pixmap for drawing area */ static GdkPixmap *pixmap = 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 = !current_device->has_cursor && cursor_proximity; if (pixmap != NULL) { if (cursor_present && (cursor_present != state || x != cursor_x || y != cursor_y)) { gdk_draw_drawable (widget->window, widget->style->fg_gc[gtk_widget_get_state (widget)], pixmap, cursor_x - 5, cursor_y - 5, cursor_x - 5, cursor_y - 5, 10, 10); } cursor_present = state; cursor_x = x; cursor_y = y; if (cursor_present) { gdk_draw_rectangle (widget->window, widget->style->black_gc, TRUE, cursor_x - 5, cursor_y -5, 10, 10); } } } /* Create a new backing pixmap of the appropriate size */ static gint configure_event (GtkWidget *widget, GdkEventConfigure *event) { if (pixmap) g_object_unref (pixmap); pixmap = gdk_pixmap_new(widget->window, widget->allocation.width, widget->allocation.height, -1); gdk_draw_rectangle (pixmap, widget->style->white_gc, TRUE, 0, 0, widget->allocation.width, widget->allocation.height); return TRUE; } /* Refill the screen from the backing pixmap */ static gint expose_event (GtkWidget *widget, GdkEventExpose *event) { gdk_draw_drawable (widget->window, widget->style->fg_gc[gtk_widget_get_state (widget)], pixmap, event->area.x, event->area.y, event->area.x, event->area.y, event->area.width, event->area.height); 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) { GdkGC *gc; GdkRectangle update_rect; switch (source) { case GDK_SOURCE_MOUSE: gc = widget->style->dark_gc[gtk_widget_get_state (widget)]; break; case GDK_SOURCE_PEN: gc = widget->style->black_gc; break; case GDK_SOURCE_ERASER: gc = widget->style->white_gc; break; default: gc = widget->style->light_gc[gtk_widget_get_state (widget)]; } update_rect.x = x - 10 * pressure; update_rect.y = y - 10 * pressure; update_rect.width = 20 * pressure; update_rect.height = 20 * pressure; gdk_draw_rectangle (pixmap, gc, TRUE, update_rect.x, update_rect.y, update_rect.width, update_rect.height); gtk_widget_queue_draw_area (widget, update_rect.x, update_rect.y, update_rect.width, update_rect.height); gdk_window_process_updates (widget->window, TRUE); } static guint32 motion_time; static void print_axes (GdkDevice *device, gdouble *axes) { int i; if (axes) { g_print ("%s ", device->name); for (i=0; inum_axes; 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 == 1 && pixmap != NULL) { gdouble pressure = 0.5; print_axes (event->device, event->axes); gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure); draw_brush (widget, event->device->source, 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; guint n_events; int i; current_device = event->device; cursor_proximity = TRUE; if (event->state & GDK_BUTTON1_MASK && pixmap != NULL) { if (gdk_device_get_history (event->device, event->window, motion_time, event->time, &events, &n_events)) { for (i=0; idevice, 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, event->device->source, 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, event->device->source, event->x, event->y, pressure); } motion_time = event->time; } if (event->is_hint) gdk_device_get_state (event->device, event->window, NULL, NULL); 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[]) { GdkDeviceManager *device_manager; GList *devices, *d; GdkEventMask event_mask; GtkWidget *window; GtkWidget *drawing_area; GtkWidget *vbox; GtkWidget *button; gtk_init (&argc, &argv); device_manager = gdk_display_get_device_manager (gdk_display_get_default ()); current_device = gdk_device_manager_get_client_pointer (device_manager); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_widget_set_name (window, "Test Input"); vbox = gtk_vbox_new (FALSE, 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 pixmap */ g_signal_connect (drawing_area, "expose_event", G_CALLBACK (expose_event), 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_POINTER_MOTION_HINT_MASK | GDK_PROXIMITY_OUT_MASK; gtk_widget_set_events (drawing_area, event_mask); devices = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_FLOATING); 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); gtk_main (); return 0; }