Pileus Git - ~andy/gtk/blob - examples/scribble-xinput/scribble-xinput.c

   1
   2 /* GTK - The GIMP Toolkit
   3  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <gtk/gtk.h>
  22
  23 /* Backing pixmap for drawing area */
  24 static GdkPixmap *pixmap = NULL;
  25
  26 /* Create a new backing pixmap of the appropriate size */
  27 static gboolean
  28 configure_event (GtkWidget *widget, GdkEventConfigure *event)
  29 {
  30   if (pixmap)
  31      g_object_unref (pixmap);
  32
  33   pixmap = gdk_pixmap_new (widget->window,
  34                            widget->allocation.width,
  35                            widget->allocation.height,
  36                            -1);
  37   gdk_draw_rectangle (pixmap,
  38                       widget->style->white_gc,
  39                       TRUE,
  40                       0, 0,
  41                       widget->allocation.width,
  42                       widget->allocation.height);
  43
  44   return TRUE;
  45 }
  46
  47 /* Redraw the screen from the backing pixmap */
  48 static gboolean
  49 expose_event (GtkWidget *widget, GdkEventExpose *event)
  50 {
  51   gdk_draw_drawable (widget->window,
  52                      widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
  53                      pixmap,
  54                      event->area.x, event->area.y,
  55                      event->area.x, event->area.y,
  56                      event->area.width, event->area.height);
  57
  58   return FALSE;
  59 }
  60
  61 /* Draw a rectangle on the screen, size depending on pressure,
  62    and color on the type of device */
  63 static void
  64 draw_brush (GtkWidget *widget, GdkInputSource source,
  65             gdouble x, gdouble y, gdouble pressure)
  66 {
  67   GdkGC *gc;
  68   GdkRectangle update_rect;
  69
  70   switch (source)
  71     {
  72     case GDK_SOURCE_MOUSE:
  73       gc = widget->style->dark_gc[GTK_WIDGET_STATE (widget)];
  74       break;
  75     case GDK_SOURCE_PEN:
  76       gc = widget->style->black_gc;
  77       break;
  78     case GDK_SOURCE_ERASER:
  79       gc = widget->style->white_gc;
  80       break;
  81     default:
  82       gc = widget->style->light_gc[GTK_WIDGET_STATE (widget)];
  83     }
  84
  85   update_rect.x = x - 10 * pressure;
  86   update_rect.y = y - 10 * pressure;
  87   update_rect.width = 20 * pressure;
  88   update_rect.height = 20 * pressure;
  89   gdk_draw_rectangle (pixmap, gc, TRUE,
  90                       update_rect.x, update_rect.y,
  91                       update_rect.width, update_rect.height);
  92   gtk_widget_queue_draw_area (widget,
  93                       update_rect.x, update_rect.y,
  94                       update_rect.width, update_rect.height);
  95 }
  96
  97 static void
  98 print_button_press (GdkDevice *device)
  99 {
 100   g_print ("Button press on device '%s'\n", device->name);
 101 }
 102
 103 static gboolean
 104 button_press_event (GtkWidget *widget, GdkEventButton *event)
 105 {
 106   print_button_press (event->device);
 107
 108   if (event->button == 1 && pixmap != NULL) {
 109     gdouble pressure;
 110     gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
 111     draw_brush (widget, event->device->source, event->x, event->y, pressure);
 112   }
 113
 114   return TRUE;
 115 }
 116
 117 static gboolean
 118 motion_notify_event (GtkWidget *widget, GdkEventMotion *event)
 119 {
 120   gdouble x, y;
 121   gdouble pressure;
 122   GdkModifierType state;
 123
 124   if (event->is_hint)
 125     {
 126       gdk_device_get_state (event->device, event->window, NULL, &state);
 127       gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_X, &x);
 128       gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_Y, &y);
 129       gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
 130     }
 131   else
 132     {
 133       x = event->x;
 134       y = event->y;
 135       gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
 136       state = event->state;
 137     }
 138
 139   if (state & GDK_BUTTON1_MASK && pixmap != NULL)
 140     draw_brush (widget, event->device->source, x, y, pressure);
 141
 142   return TRUE;
 143 }
 144
 145 void
 146 input_dialog_destroy (GtkWidget *w, gpointer data)
 147 {
 148   *((GtkWidget **)data) = NULL;
 149 }
 150
 151 void
 152 create_input_dialog ()
 153 {
 154   static GtkWidget *inputd = NULL;
 155
 156   if (!inputd)
 157     {
 158       inputd = gtk_input_dialog_new();
 159
 160       g_signal_connect (inputd, "destroy",
 161                         G_CALLBACK (input_dialog_destroy), &inputd);
 162       g_signal_connect_swapped (GTK_INPUT_DIALOG (inputd)->close_button,
 163                                 "clicked",
 164                                 G_CALLBACK (gtk_widget_hide),
 165                                 inputd);
 166       gtk_widget_hide (GTK_INPUT_DIALOG (inputd)->save_button);
 167
 168       gtk_widget_show (inputd);
 169     }
 170   else
 171     {
 172       if (!gtk_widget_get_mapped (inputd))
 173         gtk_widget_show (inputd);
 174       else
 175         gdk_window_raise (inputd->window);
 176     }
 177 }
 178
 179 int
 180 main (int argc, char *argv[])
 181 {
 182   GtkWidget *window;
 183   GtkWidget *drawing_area;
 184   GtkWidget *vbox;
 185
 186   GtkWidget *button;
 187
 188   gtk_init (&argc, &argv);
 189
 190   window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
 191   gtk_widget_set_name (window, "Test Input");
 192
 193   vbox = gtk_vbox_new (FALSE, 0);
 194   gtk_container_add (GTK_CONTAINER (window), vbox);
 195   gtk_widget_show (vbox);
 196
 197   g_signal_connect (window, "destroy",
 198                     G_CALLBACK (gtk_main_quit), NULL);
 199
 200   /* Create the drawing area */
 201
 202   drawing_area = gtk_drawing_area_new ();
 203   gtk_widget_set_size_request (GTK_WIDGET (drawing_area), 200, 200);
 204   gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
 205
 206   gtk_widget_show (drawing_area);
 207
 208   /* Signals used to handle backing pixmap */
 209
 210   g_signal_connect (drawing_area, "expose-event",
 211                     G_CALLBACK (expose_event), NULL);
 212   g_signal_connect (drawing_area,"configure-event",
 213                     G_CALLBACK (configure_event), NULL);
 214
 215   /* Event signals */
 216
 217   g_signal_connect (drawing_area, "motion-notify-event",
 218                     G_CALLBACK (motion_notify_event), NULL);
 219   g_signal_connect (drawing_area, "button-press-event",
 220                     G_CALLBACK (button_press_event), NULL);
 221
 222   gtk_widget_set_events (drawing_area, GDK_EXPOSURE_MASK
 223                          | GDK_LEAVE_NOTIFY_MASK
 224                          | GDK_BUTTON_PRESS_MASK
 225                          | GDK_POINTER_MOTION_MASK
 226                          | GDK_POINTER_MOTION_HINT_MASK);
 227
 228   /* The following call enables tracking and processing of extension
 229      events for the drawing area */
 230   gtk_widget_set_extension_events (drawing_area, GDK_EXTENSION_EVENTS_CURSOR);
 231
 232   /* .. And some buttons */
 233   button = gtk_button_new_with_label ("Input Dialog");
 234   gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
 235
 236   g_signal_connect (button, "clicked",
 237                     G_CALLBACK (create_input_dialog), NULL);
 238   gtk_widget_show (button);
 239
 240   button = gtk_button_new_with_label ("Quit");
 241   gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
 242
 243   g_signal_connect_swapped (button, "clicked",
 244                             G_CALLBACK (gtk_widget_destroy),
 245                             window);
 246   gtk_widget_show (button);
 247
 248   gtk_widget_show (window);
 249
 250   gtk_main ();
 251
 252   return 0;
 253 }