gschem/src/x_preview.c

   1 /* gEDA - GPL Electronic Design Automation
   2  * gschem - gEDA Schematic Capture
   3  * Copyright (C) 1998-2007 Ales Hvezda
   4  * Copyright (C) 1998-2007 gEDA Contributors (see ChangeLog for details)
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA
  19  */
  20 #include <config.h>
  21
  22 #include <stdio.h>
  23 #ifdef HAVE_STDLIB_H
  24 #include <stdlib.h>
  25 #endif
  26 #ifdef HAVE_STRING_H
  27 #include <string.h>
  28 #endif
  29 #ifdef HAVE_UNISTD_H
  30 #include <unistd.h>
  31 #endif
  32
  33 #include <libgeda/libgeda.h>
  34
  35 #include "../include/globals.h"
  36 #include "../include/prototype.h"
  37
  38 #ifdef HAVE_LIBDMALLOC
  39 #include <dmalloc.h>
  40 #endif
  41
  42 #include "../include/x_preview.h"
  43
  44
  45 extern int mouse_x, mouse_y;
  46
  47
  48 enum {
  49   PROP_FILENAME=1,
  50   PROP_ACTIVE
  51 };
  52
  53 static GObjectClass *preview_parent_class = NULL;
  54
  55
  56 static void preview_class_init (PreviewClass *class);
  57 static void preview_init       (Preview *preview);
  58 static void preview_set_property (GObject *object,
  59                                   guint property_id,
  60                                   const GValue *value,
  61                                   GParamSpec *pspec);
  62 static void preview_get_property (GObject *object,
  63                                   guint property_id,
  64                                   GValue *value,
  65                                   GParamSpec *pspec);
  66 static void preview_dispose (GObject *self);
  67
  68
  69 /*! \brief Completes initialitation of the widget after realization.
  70  *  \par Function Description
  71  *  This function terminates the initialization of preview's toplevel
  72  *  environment after the widget has been realized.
  73  *
  74  *  It creates a preview page in the toplevel environment.
  75  *
  76  *  \param [in] widget    The preview widget.
  77  *  \param [in] user_data Unused user data.
  78  */
  79 static void
  80 preview_callback_realize (GtkWidget *widget,
  81                           gpointer user_data)
  82 {
  83   Preview *preview = PREVIEW (widget);
  84   TOPLEVEL *preview_toplevel = preview->preview_toplevel;
  85   PAGE *preview_page;
  86
  87   preview_toplevel->window = preview_toplevel->drawing_area->window;
  88   gtk_widget_grab_focus (preview_toplevel->drawing_area);
  89
  90   preview_toplevel->backingstore = gdk_pixmap_new (
  91     preview_toplevel->window,
  92     preview_toplevel->drawing_area->allocation.width,
  93     preview_toplevel->drawing_area->allocation.height, -1);
  94
  95   x_window_setup_gc (preview_toplevel);
  96
  97   preview_page = s_page_new (preview_toplevel, "unknown");
  98   s_page_goto (preview_toplevel, preview_page);
  99
 100   i_vars_set (preview_toplevel);
 101
 102   /* be sure to turn off the grid */
 103   preview_toplevel->grid = FALSE;
 104
 105   /* preview_toplevel windows don't have toolbars */
 106   preview_toplevel->handleboxes = FALSE;
 107   preview_toplevel->toolbars    = FALSE;
 108
 109   x_repaint_background(preview_toplevel);
 110
 111   preview_toplevel->DONT_RECALC = 0;
 112   preview_toplevel->DONT_RESIZE = 0;
 113   preview_toplevel->DONT_REDRAW = 0;
 114
 115   a_zoom_extents(preview_toplevel,
 116                  preview_page->object_head,
 117                  A_PAN_DONT_REDRAW);
 118
 119   o_redraw_all(preview_toplevel);
 120
 121 }
 122
 123 /*! \brief Redraws the view when widget is exposed.
 124  *  \par Function Description
 125  *  It redraws the preview pixmap every time the widget is exposed.
 126  *
 127  *  \param [in] widget    The preview widget.
 128  *  \param [in] event     The event structure.
 129  *  \param [in] user_data Unused user data.
 130  *  \returns FALSE to propagate the event further.
 131  */
 132 static gboolean
 133 preview_callback_expose (GtkWidget *widget,
 134                          GdkEventExpose *event,
 135                          gpointer user_data)
 136 {
 137   Preview *preview = PREVIEW (widget);
 138   TOPLEVEL *preview_toplevel = preview->preview_toplevel;
 139
 140   gdk_draw_pixmap(widget->window,
 141                   widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
 142                   preview_toplevel->backingstore,
 143                   event->area.x, event->area.y,
 144                   event->area.x, event->area.y,
 145                   event->area.width, event->area.height);
 146
 147   return FALSE;
 148 }
 149
 150 /*! \brief Handles the press on a mouse button.
 151  *  \par Function Description
 152  *  It handles the user inputs.
 153  *
 154  *  Three action are available: zoom in, pan and zoom out on preview display.
 155  *
 156  *  \param [in] widget    The preview widget.
 157  *  \param [in] event     The event structure.
 158  *  \param [in] user_data Unused user data.
 159  *  \returns FALSE to propagate the event further.
 160  */
 161 static gboolean
 162 preview_callback_button_press (GtkWidget *widget,
 163                                GdkEventButton *event,
 164                                gpointer user_data)
 165 {
 166   Preview *preview = PREVIEW (widget);
 167   TOPLEVEL *preview_toplevel = preview->preview_toplevel;
 168
 169   if (!preview->active || preview->filename == NULL) {
 170     return TRUE;
 171   }
 172
 173   switch (event->button) {
 174       case 1: /* left mouse button: zoom in */
 175         a_zoom (preview_toplevel, ZOOM_IN, HOTKEY, 0);
 176         o_redraw_all_fast (preview_toplevel);
 177         break;
 178       case 2: /* middle mouse button: pan */
 179         a_pan (preview_toplevel, mouse_x, mouse_y);
 180         break;
 181       case 3: /* right mouse button: zoom out */
 182         a_zoom (preview_toplevel, ZOOM_OUT, HOTKEY, 0);
 183         o_redraw_all_fast (preview_toplevel);
 184         break;
 185   }
 186
 187   return FALSE;
 188 }
 189
 190 /*! \brief Handles the displacement of the pointer.
 191  *  \par Function Description
 192  *  This function temporary saves the position of the mouse pointer
 193  *  over the preview widget.
 194  *
 195  *  This position can be later used when the user press a button of
 196  *  the mouse (see <B>preview_callback_button_press()</B>).
 197  *
 198  *  \param [in] widget    The preview widget.
 199  *  \param [in] event     The event structure.
 200  *  \param [in] user_data Unused user data.
 201  *  \returns FALSE to propagate the event further.
 202  */
 203 static gboolean
 204 preview_callback_motion_notify (GtkWidget *widget,
 205                                 GdkEventMotion *event,
 206                                 gpointer user_data)
 207 {
 208   Preview *preview = PREVIEW (widget);
 209
 210   if (!preview->active || preview->filename == NULL) {
 211     return TRUE;
 212   }
 213
 214   mouse_x = (int)event->x;
 215   mouse_y = (int)event->y;
 216
 217   return FALSE;
 218 }
 219
 220 /*! \brief Updates the preview widget.
 221  *  \par Function Description
 222  *  This function update the preview: if the preview is active and a
 223  *  filename has been given, it opens the file and display
 224  *  it. Otherwise it display a blank page.
 225  *
 226  *  \param [in] preview The preview widget.
 227  */
 228 static void
 229 preview_update (Preview *preview)
 230 {
 231   TOPLEVEL *preview_toplevel = preview->preview_toplevel;
 232
 233   if (preview_toplevel->page_current == NULL) {
 234     return;
 235   }
 236
 237   /* delete old preview, create new page */
 238   /* it would be better to just resets current page - Fix me */
 239   s_page_delete (preview_toplevel, preview_toplevel->page_current);
 240   s_page_goto (preview_toplevel, s_page_new (preview_toplevel, "preview"));
 241
 242   if (preview->active && preview->filename != NULL) {
 243     /* open up file in current page */
 244     f_open (preview_toplevel, preview->filename);
 245     /* test value returned by f_open... - Fix me */
 246     /* we should display something if there an error occured - Fix me */
 247   }
 248
 249   /* display current page (possibly empty) */
 250   a_zoom_extents (preview_toplevel,
 251                   preview_toplevel->page_current->object_head,
 252                   A_PAN_DONT_REDRAW);
 253   o_redraw_all (preview_toplevel);
 254
 255 }
 256
 257 GType
 258 preview_get_type ()
 259 {
 260   static GType preview_type = 0;
 261
 262   if (!preview_type) {
 263     static const GTypeInfo preview_info = {
 264       sizeof(PreviewClass),
 265       NULL, /* base_init */
 266       NULL, /* base_finalize */
 267       (GClassInitFunc) preview_class_init,
 268       NULL, /* class_finalize */
 269       NULL, /* class_data */
 270       sizeof(Preview),
 271       0,    /* n_preallocs */
 272       (GInstanceInitFunc) preview_init,
 273     };
 274
 275     preview_type = g_type_register_static (GTK_TYPE_DRAWING_AREA,
 276                                            "Preview",
 277                                            &preview_info, 0);
 278   }
 279
 280   return preview_type;
 281 }
 282
 283 static void
 284 preview_class_init (PreviewClass *klass)
 285 {
 286   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 287
 288   preview_parent_class = g_type_class_peek_parent (klass);
 289
 290   gobject_class->set_property = preview_set_property;
 291   gobject_class->get_property = preview_get_property;
 292   gobject_class->dispose      = preview_dispose;
 293
 294   g_object_class_install_property (
 295     gobject_class, PROP_FILENAME,
 296     g_param_spec_string ("filename",
 297                          "",
 298                          "",
 299                          NULL,
 300                          G_PARAM_READWRITE));
 301   g_object_class_install_property(
 302     gobject_class, PROP_ACTIVE,
 303     g_param_spec_boolean ("active",
 304                           "",
 305                           "",
 306                           FALSE,
 307                           G_PARAM_READWRITE));
 308
 309
 310 }
 311
 312 static void
 313 preview_init (Preview *preview)
 314 {
 315   struct event_reg_t {
 316     gchar *detailed_signal;
 317     GCallback c_handler;
 318   } drawing_area_events[] = {
 319     { "realize",              G_CALLBACK (preview_callback_realize)       },
 320     { "expose_event",         G_CALLBACK (preview_callback_expose)        },
 321     { "button_press_event",   G_CALLBACK (preview_callback_button_press)  },
 322     { "motion_notify_event",  G_CALLBACK (preview_callback_motion_notify) },
 323     { NULL,                   NULL                                        }
 324   }, *tmp;
 325   TOPLEVEL *preview_toplevel;
 326
 327   preview_toplevel = s_toplevel_new ();
 328
 329   preview_toplevel->init_left   = 0;
 330   preview_toplevel->init_top    = 0;
 331   preview_toplevel->init_right  = WIDTH_C;
 332   preview_toplevel->init_bottom = HEIGHT_C;
 333   preview_toplevel->width  = 160;
 334   preview_toplevel->height = 120;
 335   preview_toplevel->win_width  = preview_toplevel->width;
 336   preview_toplevel->win_height = preview_toplevel->height;
 337   /* be sure to turn off scrollbars */
 338   preview_toplevel->scrollbars_flag = FALSE;
 339
 340   preview_toplevel->drawing_area = GTK_WIDGET (preview);
 341   preview->preview_toplevel = preview_toplevel;
 342
 343   g_object_set (GTK_WIDGET (preview),
 344                 "width-request",  preview_toplevel->width,
 345                 "height-request", preview_toplevel->height,
 346                 NULL);
 347
 348   preview->active   = FALSE;
 349   preview->filename = NULL;
 350
 351   gtk_widget_set_events (GTK_WIDGET (preview),
 352                          GDK_EXPOSURE_MASK |
 353                          GDK_POINTER_MOTION_MASK |
 354                          GDK_BUTTON_PRESS_MASK);
 355   for (tmp = drawing_area_events; tmp->detailed_signal != NULL; tmp++) {
 356     g_signal_connect (preview,
 357                       tmp->detailed_signal,
 358                       tmp->c_handler,
 359                       NULL);
 360   }
 361
 362 }
 363
 364 static void
 365 preview_set_property (GObject *object,
 366                       guint property_id,
 367                       const GValue *value,
 368                       GParamSpec *pspec)
 369 {
 370   Preview *preview = PREVIEW (object);
 371   TOPLEVEL *preview_toplevel = preview->preview_toplevel;
 372
 373   g_assert (preview_toplevel != NULL);
 374
 375   switch(property_id) {
 376       case PROP_FILENAME:
 377         g_free (preview->filename);
 378         preview->filename = g_strdup (g_value_get_string (value));
 379         if (preview->active) preview_update (preview);
 380         break;
 381       case PROP_ACTIVE:
 382         preview->active = g_value_get_boolean (value);
 383         preview_update (preview);
 384         break;
 385       default:
 386         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
 387   }
 388
 389 }
 390
 391 static void
 392 preview_get_property (GObject *object,
 393                       guint property_id,
 394                       GValue *value,
 395                       GParamSpec *pspec)
 396 {
 397   Preview *preview = PREVIEW (object);
 398   TOPLEVEL *preview_toplevel = preview->preview_toplevel;
 399
 400   switch(property_id) {
 401       case PROP_FILENAME:
 402         g_assert (preview_toplevel != NULL);
 403         /* return the filename of the current page in toplevel */
 404         g_value_set_string (value,
 405                             preview_toplevel->page_current->page_filename);
 406         break;
 407       case PROP_ACTIVE:
 408         g_value_set_boolean (value, preview->active);
 409         break;
 410       default:
 411         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
 412   }
 413
 414 }
 415
 416 static void
 417 preview_dispose (GObject *self)
 418 {
 419   Preview *preview = PREVIEW (self);
 420   TOPLEVEL *preview_toplevel = preview->preview_toplevel;
 421
 422   if (preview_toplevel != NULL) {
 423     preview_toplevel->drawing_area = NULL;
 424
 425     o_attrib_free_current (preview_toplevel);
 426     o_complex_free_filename (preview_toplevel);
 427
 428     if (preview_toplevel->backingstore) {
 429       gdk_pixmap_unref (preview_toplevel->backingstore);
 430     }
 431
 432     x_window_free_gc (preview_toplevel);
 433
 434     s_toplevel_delete (preview_toplevel);
 435
 436     preview->preview_toplevel = NULL;
 437   }
 438
 439   G_OBJECT_CLASS (preview_parent_class)->dispose (self);
 440
 441 }
 442
 443
 444