Pileus Git - ~andy/gtk/blob - gtk/gtklabel.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19 #include <string.h>
  20 #include "gtklabel.h"
  21
  22
  23 enum {
  24   ARG_0,
  25   ARG_LABEL,
  26   ARG_JUSTIFY
  27 };
  28
  29 static void gtk_label_class_init   (GtkLabelClass  *klass);
  30 static void gtk_label_init         (GtkLabel       *label);
  31 static void gtk_label_set_arg      (GtkLabel       *label,
  32                                     GtkArg         *arg,
  33                                     guint           arg_id);
  34 static void gtk_label_get_arg      (GtkLabel       *label,
  35                                     GtkArg         *arg,
  36                                     guint           arg_id);
  37 static void gtk_label_finalize     (GtkObject      *object);
  38 static void gtk_label_size_request (GtkWidget      *widget,
  39                                     GtkRequisition *requisition);
  40 static gint gtk_label_expose       (GtkWidget      *widget,
  41                                     GdkEventExpose *event);
  42 static void gtk_label_state_changed (GtkWidget      *widget,
  43                                      guint           previous_state);
  44 static void gtk_label_style_set     (GtkWidget      *widget,
  45                                      GtkStyle       *previous_style);
  46
  47
  48
  49 static GtkMiscClass *parent_class = NULL;
  50
  51
  52 GtkType
  53 gtk_label_get_type (void)
  54 {
  55   static GtkType label_type = 0;
  56
  57   if (!label_type)
  58     {
  59       GtkTypeInfo label_info =
  60       {
  61         "GtkLabel",
  62         sizeof (GtkLabel),
  63         sizeof (GtkLabelClass),
  64         (GtkClassInitFunc) gtk_label_class_init,
  65         (GtkObjectInitFunc) gtk_label_init,
  66         (GtkArgSetFunc) gtk_label_set_arg,
  67         (GtkArgGetFunc) gtk_label_get_arg,
  68       };
  69
  70       label_type = gtk_type_unique (gtk_misc_get_type (), &label_info);
  71       gtk_type_set_chunk_alloc (label_type, 32);
  72     }
  73
  74   return label_type;
  75 }
  76
  77 static void
  78 gtk_label_class_init (GtkLabelClass *class)
  79 {
  80   GtkObjectClass *object_class;
  81   GtkWidgetClass *widget_class;
  82
  83   object_class = (GtkObjectClass*) class;
  84   widget_class = (GtkWidgetClass*) class;
  85
  86   parent_class = gtk_type_class (gtk_misc_get_type ());
  87
  88   gtk_object_add_arg_type ("GtkLabel::label", GTK_TYPE_STRING, GTK_ARG_READWRITE, ARG_LABEL);
  89   gtk_object_add_arg_type ("GtkLabel::justify", GTK_TYPE_JUSTIFICATION, GTK_ARG_READWRITE, ARG_JUSTIFY);
  90
  91   object_class->finalize = gtk_label_finalize;
  92
  93   widget_class->size_request = gtk_label_size_request;
  94   widget_class->expose_event = gtk_label_expose;
  95   widget_class->style_set    = gtk_label_style_set;
  96   widget_class->state_changed = gtk_label_state_changed;
  97 }
  98
  99 static void
 100 gtk_label_set_arg (GtkLabel       *label,
 101                    GtkArg         *arg,
 102                    guint           arg_id)
 103 {
 104   switch (arg_id)
 105     {
 106     case ARG_LABEL:
 107       gtk_label_set (label, GTK_VALUE_STRING (*arg));
 108       break;
 109     case ARG_JUSTIFY:
 110       gtk_label_set_justify (label, GTK_VALUE_ENUM (*arg));
 111       break;
 112     default:
 113       break;
 114     }
 115 }
 116
 117 static void
 118 gtk_label_get_arg (GtkLabel       *label,
 119                    GtkArg         *arg,
 120                    guint           arg_id)
 121 {
 122   switch (arg_id)
 123     {
 124     case ARG_LABEL:
 125       GTK_VALUE_STRING (*arg) = g_strdup (label->label);
 126       break;
 127     case ARG_JUSTIFY:
 128       GTK_VALUE_ENUM (*arg) = label->jtype;
 129       break;
 130     default:
 131       arg->type = GTK_TYPE_INVALID;
 132       break;
 133     }
 134 }
 135
 136 static void
 137 gtk_label_init (GtkLabel *label)
 138 {
 139   GTK_WIDGET_SET_FLAGS (label, GTK_NO_WINDOW);
 140
 141   label->label = NULL;
 142   label->row = NULL;
 143   label->max_width = 0;
 144   label->jtype = GTK_JUSTIFY_CENTER;
 145   label->needs_clear = FALSE;
 146
 147   gtk_label_set (label, "");
 148 }
 149
 150 GtkWidget*
 151 gtk_label_new (const gchar *str)
 152 {
 153   GtkLabel *label;
 154
 155   g_return_val_if_fail (str != NULL, NULL);
 156
 157   label = gtk_type_new (gtk_label_get_type ());
 158
 159   gtk_label_set (label, str);
 160
 161   return GTK_WIDGET (label);
 162 }
 163
 164 void
 165 gtk_label_set (GtkLabel    *label,
 166                const gchar *str)
 167 {
 168   char* p;
 169
 170   g_return_if_fail (label != NULL);
 171   g_return_if_fail (GTK_IS_LABEL (label));
 172   g_return_if_fail (str != NULL);
 173
 174   if (label->label)
 175     g_free (label->label);
 176   label->label = g_strdup (str);
 177
 178   if (label->row)
 179     g_slist_free (label->row);
 180   label->row = NULL;
 181   label->row = g_slist_append (label->row, label->label);
 182   p = label->label;
 183   while ((p = strchr(p, '\n')))
 184     label->row = g_slist_append (label->row, ++p);
 185
 186   if (GTK_WIDGET_VISIBLE (label))
 187     {
 188       if (GTK_WIDGET_MAPPED (label))
 189         gdk_window_clear_area (GTK_WIDGET (label)->window,
 190                                GTK_WIDGET (label)->allocation.x,
 191                                GTK_WIDGET (label)->allocation.y,
 192                                GTK_WIDGET (label)->allocation.width,
 193                                GTK_WIDGET (label)->allocation.height);
 194
 195       gtk_widget_queue_resize (GTK_WIDGET (label));
 196     }
 197 }
 198
 199 void
 200 gtk_label_set_justify (GtkLabel        *label,
 201                        GtkJustification jtype)
 202 {
 203   g_return_if_fail (label != NULL);
 204   g_return_if_fail (GTK_IS_LABEL (label));
 205
 206   if ((GtkJustification) label->jtype != jtype)
 207     {
 208       label->jtype = jtype;
 209
 210       if (GTK_WIDGET_VISIBLE (label))
 211         {
 212           if (GTK_WIDGET_MAPPED (label))
 213             gdk_window_clear_area (GTK_WIDGET (label)->window,
 214                                    GTK_WIDGET (label)->allocation.x,
 215                                    GTK_WIDGET (label)->allocation.y,
 216                                    GTK_WIDGET (label)->allocation.width,
 217                                    GTK_WIDGET (label)->allocation.height);
 218
 219           gtk_widget_queue_resize (GTK_WIDGET (label));
 220         }
 221     }
 222 }
 223
 224 void
 225 gtk_label_get (GtkLabel  *label,
 226                gchar    **str)
 227 {
 228   g_return_if_fail (label != NULL);
 229   g_return_if_fail (GTK_IS_LABEL (label));
 230   g_return_if_fail (str != NULL);
 231
 232   *str = label->label;
 233 }
 234
 235
 236 static void
 237 gtk_label_finalize (GtkObject *object)
 238 {
 239   GtkLabel *label;
 240
 241   g_return_if_fail (object != NULL);
 242   g_return_if_fail (GTK_IS_LABEL (object));
 243
 244   label = GTK_LABEL (object);
 245
 246   g_free (label->label);
 247   g_slist_free (label->row);
 248
 249   (* GTK_OBJECT_CLASS (parent_class)->finalize) (object);
 250 }
 251
 252 static void
 253 gtk_label_size_request (GtkWidget      *widget,
 254                         GtkRequisition *requisition)
 255 {
 256   GtkLabel *label;
 257   GSList *row;
 258   gint width;
 259
 260   g_return_if_fail (widget != NULL);
 261   g_return_if_fail (GTK_IS_LABEL (widget));
 262   g_return_if_fail (requisition != NULL);
 263
 264   label = GTK_LABEL (widget);
 265
 266   row = label->row;
 267   width = 0;
 268   while (row)
 269     {
 270       if (row->next)
 271         width = MAX (width,
 272                      gdk_text_width (GTK_WIDGET (label)->style->font,
 273                                      row->data,
 274                                      (gchar*) row->next->data - (gchar*) row->data - 1));
 275       else
 276         width = MAX (width, gdk_string_width (GTK_WIDGET (label)->style->font, row->data));
 277       row = row->next;
 278     }
 279
 280   label->max_width = width;
 281   requisition->width = width + label->misc.xpad * 2;
 282   requisition->height = ((GTK_WIDGET (label)->style->font->ascent +
 283                           GTK_WIDGET (label)->style->font->descent + 2) *
 284                          g_slist_length(label->row) +
 285                          label->misc.ypad * 2);
 286 }
 287
 288 static gint
 289 gtk_label_expose (GtkWidget      *widget,
 290                   GdkEventExpose *event)
 291 {
 292   GtkLabel *label;
 293   GtkMisc *misc;
 294   GSList *row;
 295   gint state;
 296   gint offset;
 297   gint len;
 298   gint x, y;
 299
 300   g_return_val_if_fail (widget != NULL, FALSE);
 301   g_return_val_if_fail (GTK_IS_LABEL (widget), FALSE);
 302   g_return_val_if_fail (event != NULL, FALSE);
 303
 304   if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_MAPPED (widget))
 305     {
 306       label = GTK_LABEL (widget);
 307       misc = GTK_MISC (widget);
 308
 309       state = widget->state;
 310
 311       /*
 312        * GC Clipping
 313        */
 314       gdk_gc_set_clip_rectangle (widget->style->white_gc, &event->area);
 315       gdk_gc_set_clip_rectangle (widget->style->fg_gc[state], &event->area);
 316
 317       /* We clear the whole allocation here so that if a partial
 318        * expose is triggered we don't just clear part and mess up
 319        * when the queued redraw comes along. (There will always
 320        * be a complete queued redraw when the needs_clear flag
 321        * is set.)
 322        */
 323       if (label->needs_clear)
 324         {
 325           gdk_window_clear_area (widget->window,
 326                                  widget->allocation.x,
 327                                  widget->allocation.y,
 328                                  widget->allocation.width,
 329                                  widget->allocation.height);
 330
 331           label->needs_clear = FALSE;
 332         }
 333
 334       x = widget->allocation.x + misc->xpad +
 335         (widget->allocation.width - (label->max_width + label->misc.xpad * 2))
 336         * misc->xalign + 0.5;
 337
 338       y = (widget->allocation.y * (1.0 - misc->yalign) +
 339            (widget->allocation.y + widget->allocation.height -
 340             (widget->requisition.height - misc->ypad * 2)) *
 341            misc->yalign + widget->style->font->ascent) + 1.5;
 342
 343       row = label->row;
 344       while (row && row->next)
 345         {
 346           len = (gchar*) row->next->data - (gchar*) row->data - 1;
 347           offset = 0;
 348
 349           if (label->jtype == GTK_JUSTIFY_CENTER)
 350             offset = (label->max_width - gdk_text_width (widget->style->font, row->data, len)) / 2;
 351
 352           else if (label->jtype == GTK_JUSTIFY_RIGHT)
 353             offset = (label->max_width - gdk_text_width (widget->style->font, row->data, len));
 354
 355           if (state == GTK_STATE_INSENSITIVE)
 356             gdk_draw_text (widget->window, widget->style->font,
 357                            widget->style->white_gc,
 358                            offset + x + 1, y + 1, row->data, len);
 359
 360           gdk_draw_text (widget->window, widget->style->font,
 361                          widget->style->fg_gc[state],
 362                          offset + x, y, row->data, len);
 363           row = row->next;
 364           y += widget->style->font->ascent + widget->style->font->descent + 2;
 365         }
 366
 367       /*
 368        * COMMENT: we can avoid gdk_text_width() calls here storing in label->row
 369        * the widths of the rows calculated in gtk_label_set.
 370        * Once we have a wrapping interface we can support GTK_JUSTIFY_FILL.
 371        */
 372       offset = 0;
 373
 374       if (label->jtype == GTK_JUSTIFY_CENTER)
 375         offset = (label->max_width - gdk_string_width (widget->style->font, row->data)) / 2;
 376
 377       else if (label->jtype == GTK_JUSTIFY_RIGHT)
 378         offset = (label->max_width - gdk_string_width (widget->style->font, row->data));
 379
 380       if (state == GTK_STATE_INSENSITIVE)
 381         gdk_draw_string (widget->window, widget->style->font,
 382                          widget->style->white_gc,
 383                          offset + x + 1, y + 1, row->data);
 384
 385       gdk_draw_string (widget->window, widget->style->font,
 386                        widget->style->fg_gc[state],
 387                        offset + x, y, row->data);
 388
 389       gdk_gc_set_clip_mask (widget->style->white_gc, NULL);
 390       gdk_gc_set_clip_mask (widget->style->fg_gc[state], NULL);
 391
 392     }
 393   return TRUE;
 394 }
 395
 396 static void
 397 gtk_label_state_changed (GtkWidget      *widget,
 398                          guint           previous_state)
 399 {
 400   if (GTK_WIDGET_DRAWABLE (widget))
 401     GTK_LABEL (widget)->needs_clear = TRUE;
 402 }
 403
 404 static void
 405 gtk_label_style_set (GtkWidget  *widget,
 406                      GtkStyle   *previous_style)
 407 {
 408   if (GTK_WIDGET_DRAWABLE (widget))
 409     GTK_LABEL (widget)->needs_clear = TRUE;
 410 }
 411