gtklabel.c 10.7 KB
Newer Older
Elliot Lee's avatar
Elliot Lee committed
1 2 3 4 5 6 7 8 9 10
/* 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 Library 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
Tim Janik's avatar
Tim Janik committed
11
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
Elliot Lee's avatar
Elliot Lee committed
12 13 14
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
15 16 17
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
Elliot Lee's avatar
Elliot Lee committed
18 19 20 21 22
 */
#include <string.h>
#include "gtklabel.h"


23 24 25 26 27 28
enum {
  ARG_0,
  ARG_LABEL,
  ARG_JUSTIFY
};

Elliot Lee's avatar
Elliot Lee committed
29
static void gtk_label_class_init   (GtkLabelClass  *klass);
Tim Janik's avatar
Tim Janik committed
30 31 32 33 34 35 36 37 38
static void gtk_label_init	   (GtkLabel	   *label);
static void gtk_label_set_arg	   (GtkLabel	   *label,
				    GtkArg	   *arg,
				    guint	    arg_id);
static void gtk_label_get_arg	   (GtkLabel	   *label,
				    GtkArg	   *arg,
				    guint	    arg_id);
static void gtk_label_finalize	   (GtkObject	   *object);
static void gtk_label_size_request (GtkWidget	   *widget,
Elliot Lee's avatar
Elliot Lee committed
39
				    GtkRequisition *requisition);
Tim Janik's avatar
Tim Janik committed
40
static gint gtk_label_expose	   (GtkWidget	   *widget,
Elliot Lee's avatar
Elliot Lee committed
41
				    GdkEventExpose *event);
Tim Janik's avatar
Tim Janik committed
42
static void gtk_label_state_changed (GtkWidget	    *widget,
43
				     guint	     previous_state);
Tim Janik's avatar
Tim Janik committed
44 45
static void gtk_label_style_set	    (GtkWidget	    *widget,
				     GtkStyle	    *previous_style);
46

Elliot Lee's avatar
Elliot Lee committed
47 48 49 50 51


static GtkMiscClass *parent_class = NULL;


Tim Janik's avatar
Tim Janik committed
52
GtkType
53
gtk_label_get_type (void)
Elliot Lee's avatar
Elliot Lee committed
54
{
Tim Janik's avatar
Tim Janik committed
55 56
  static GtkType label_type = 0;
  
Elliot Lee's avatar
Elliot Lee committed
57 58 59 60 61 62 63 64 65
  if (!label_type)
    {
      GtkTypeInfo label_info =
      {
	"GtkLabel",
	sizeof (GtkLabel),
	sizeof (GtkLabelClass),
	(GtkClassInitFunc) gtk_label_class_init,
	(GtkObjectInitFunc) gtk_label_init,
66
	(GtkArgSetFunc) gtk_label_set_arg,
Tim Janik's avatar
Tim Janik committed
67
	(GtkArgGetFunc) gtk_label_get_arg,
Elliot Lee's avatar
Elliot Lee committed
68
      };
Tim Janik's avatar
Tim Janik committed
69
      
Elliot Lee's avatar
Elliot Lee committed
70
      label_type = gtk_type_unique (gtk_misc_get_type (), &label_info);
71
      gtk_type_set_chunk_alloc (label_type, 32);
Elliot Lee's avatar
Elliot Lee committed
72
    }
Tim Janik's avatar
Tim Janik committed
73
  
Elliot Lee's avatar
Elliot Lee committed
74 75 76
  return label_type;
}

77
static void
Elliot Lee's avatar
Elliot Lee committed
78 79 80 81
gtk_label_class_init (GtkLabelClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
Tim Janik's avatar
Tim Janik committed
82
  
Elliot Lee's avatar
Elliot Lee committed
83 84
  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;
Tim Janik's avatar
Tim Janik committed
85
  
Elliot Lee's avatar
Elliot Lee committed
86
  parent_class = gtk_type_class (gtk_misc_get_type ());
Tim Janik's avatar
Tim Janik committed
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);
Tim Janik's avatar
Tim Janik committed
90
  
91
  object_class->finalize = gtk_label_finalize;
Tim Janik's avatar
Tim Janik committed
92
  
Elliot Lee's avatar
Elliot Lee committed
93 94
  widget_class->size_request = gtk_label_size_request;
  widget_class->expose_event = gtk_label_expose;
95 96
  widget_class->style_set    = gtk_label_style_set;
  widget_class->state_changed = gtk_label_state_changed;
Elliot Lee's avatar
Elliot Lee committed
97 98
}

99
static void
Tim Janik's avatar
Tim Janik committed
100 101 102
gtk_label_set_arg (GtkLabel	  *label,
		   GtkArg	  *arg,
		   guint	   arg_id)
103 104 105 106 107 108 109 110 111
{
  switch (arg_id)
    {
    case ARG_LABEL:
      gtk_label_set (label, GTK_VALUE_STRING (*arg));
      break;
    case ARG_JUSTIFY:
      gtk_label_set_justify (label, GTK_VALUE_ENUM (*arg));
      break;
Tim Janik's avatar
Tim Janik committed
112 113
    default:
      break;
114 115 116
    }
}

Tim Janik's avatar
Tim Janik committed
117 118 119 120
static void
gtk_label_get_arg (GtkLabel	  *label,
		   GtkArg	  *arg,
		   guint	   arg_id)
121 122 123 124 125 126 127 128 129 130 131 132 133 134 135
{
  switch (arg_id)
    {
    case ARG_LABEL:
      GTK_VALUE_STRING (*arg) = g_strdup (label->label);
      break;
    case ARG_JUSTIFY:
      GTK_VALUE_ENUM (*arg) = label->jtype;
      break;
    default:
      arg->type = GTK_TYPE_INVALID;
      break;
    }
}

136
static void
Elliot Lee's avatar
Elliot Lee committed
137 138 139
gtk_label_init (GtkLabel *label)
{
  GTK_WIDGET_SET_FLAGS (label, GTK_NO_WINDOW);
Tim Janik's avatar
Tim Janik committed
140
  
Elliot Lee's avatar
Elliot Lee committed
141 142
  label->label = NULL;
  label->row = NULL;
Tim Janik's avatar
Tim Janik committed
143
  label->max_width = 0;
Elliot Lee's avatar
Elliot Lee committed
144
  label->jtype = GTK_JUSTIFY_CENTER;
Tim Janik's avatar
Tim Janik committed
145 146
  label->needs_clear = FALSE;
  
147
  gtk_label_set (label, "");
Elliot Lee's avatar
Elliot Lee committed
148 149 150
}

GtkWidget*
Tim Janik's avatar
Tim Janik committed
151
gtk_label_new (const gchar *str)
Elliot Lee's avatar
Elliot Lee committed
152 153
{
  GtkLabel *label;
Tim Janik's avatar
Tim Janik committed
154
  
Elliot Lee's avatar
Elliot Lee committed
155
  g_return_val_if_fail (str != NULL, NULL);
Tim Janik's avatar
Tim Janik committed
156
  
Elliot Lee's avatar
Elliot Lee committed
157
  label = gtk_type_new (gtk_label_get_type ());
Tim Janik's avatar
Tim Janik committed
158
  
Elliot Lee's avatar
Elliot Lee committed
159
  gtk_label_set (label, str);
Tim Janik's avatar
Tim Janik committed
160
  
Elliot Lee's avatar
Elliot Lee committed
161 162 163 164
  return GTK_WIDGET (label);
}

void
Tim Janik's avatar
Tim Janik committed
165 166
gtk_label_set (GtkLabel	   *label,
	       const gchar *str)
Elliot Lee's avatar
Elliot Lee committed
167 168
{
  char* p;
Tim Janik's avatar
Tim Janik committed
169
  
Elliot Lee's avatar
Elliot Lee committed
170 171 172
  g_return_if_fail (label != NULL);
  g_return_if_fail (GTK_IS_LABEL (label));
  g_return_if_fail (str != NULL);
Tim Janik's avatar
Tim Janik committed
173
  
Elliot Lee's avatar
Elliot Lee committed
174 175 176
  if (label->label)
    g_free (label->label);
  label->label = g_strdup (str);
Tim Janik's avatar
Tim Janik committed
177
  
Elliot Lee's avatar
Elliot Lee committed
178 179 180 181 182 183 184
  if (label->row)
    g_slist_free (label->row);
  label->row = NULL;
  label->row = g_slist_append (label->row, label->label);
  p = label->label;
  while ((p = strchr(p, '\n')))
    label->row = g_slist_append (label->row, ++p);
Tim Janik's avatar
Tim Janik committed
185
  
Elliot Lee's avatar
Elliot Lee committed
186 187 188 189 190 191 192 193
  if (GTK_WIDGET_VISIBLE (label))
    {
      if (GTK_WIDGET_MAPPED (label))
	gdk_window_clear_area (GTK_WIDGET (label)->window,
			       GTK_WIDGET (label)->allocation.x,
			       GTK_WIDGET (label)->allocation.y,
			       GTK_WIDGET (label)->allocation.width,
			       GTK_WIDGET (label)->allocation.height);
Tim Janik's avatar
Tim Janik committed
194
      
Elliot Lee's avatar
Elliot Lee committed
195 196 197 198 199
      gtk_widget_queue_resize (GTK_WIDGET (label));
    }
}

void
Tim Janik's avatar
Tim Janik committed
200 201
gtk_label_set_justify (GtkLabel	       *label,
		       GtkJustification jtype)
Elliot Lee's avatar
Elliot Lee committed
202 203 204
{
  g_return_if_fail (label != NULL);
  g_return_if_fail (GTK_IS_LABEL (label));
Tim Janik's avatar
Tim Janik committed
205
  
Elliot Lee's avatar
Elliot Lee committed
206 207 208 209 210
  if ((GtkJustification) label->jtype != jtype)
    {
      label->jtype = jtype;
      
      if (GTK_WIDGET_VISIBLE (label))
Tim Janik's avatar
Tim Janik committed
211 212 213 214 215 216 217 218 219 220
	{
	  if (GTK_WIDGET_MAPPED (label))
	    gdk_window_clear_area (GTK_WIDGET (label)->window,
				   GTK_WIDGET (label)->allocation.x,
				   GTK_WIDGET (label)->allocation.y,
				   GTK_WIDGET (label)->allocation.width,
				   GTK_WIDGET (label)->allocation.height);
	  
	  gtk_widget_queue_resize (GTK_WIDGET (label));
	}
Elliot Lee's avatar
Elliot Lee committed
221 222 223 224
    }
}

void
Tim Janik's avatar
Tim Janik committed
225 226
gtk_label_get (GtkLabel	 *label,
	       gchar	**str)
Elliot Lee's avatar
Elliot Lee committed
227 228 229 230
{
  g_return_if_fail (label != NULL);
  g_return_if_fail (GTK_IS_LABEL (label));
  g_return_if_fail (str != NULL);
Tim Janik's avatar
Tim Janik committed
231
  
Elliot Lee's avatar
Elliot Lee committed
232 233 234 235 236
  *str = label->label;
}


static void
237
gtk_label_finalize (GtkObject *object)
Elliot Lee's avatar
Elliot Lee committed
238 239
{
  GtkLabel *label;
240
  
Elliot Lee's avatar
Elliot Lee committed
241 242
  g_return_if_fail (object != NULL);
  g_return_if_fail (GTK_IS_LABEL (object));
243
  
Elliot Lee's avatar
Elliot Lee committed
244
  label = GTK_LABEL (object);
245
  
Elliot Lee's avatar
Elliot Lee committed
246 247
  g_free (label->label);
  g_slist_free (label->row);
248 249
  
  (* GTK_OBJECT_CLASS (parent_class)->finalize) (object);
Elliot Lee's avatar
Elliot Lee committed
250 251 252 253 254 255 256 257 258
}

static void
gtk_label_size_request (GtkWidget      *widget,
			GtkRequisition *requisition)
{
  GtkLabel *label;
  GSList *row;
  gint width;
Tim Janik's avatar
Tim Janik committed
259
  
Elliot Lee's avatar
Elliot Lee committed
260 261 262
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_LABEL (widget));
  g_return_if_fail (requisition != NULL);
Tim Janik's avatar
Tim Janik committed
263
  
Elliot Lee's avatar
Elliot Lee committed
264
  label = GTK_LABEL (widget);
Tim Janik's avatar
Tim Janik committed
265
  
Elliot Lee's avatar
Elliot Lee committed
266 267 268 269 270
  row = label->row;
  width = 0;
  while (row)
    {
      if (row->next)
Tim Janik's avatar
Tim Janik committed
271 272 273 274
	width = MAX (width,
		     gdk_text_width (GTK_WIDGET (label)->style->font,
				     row->data,
				     (gchar*) row->next->data - (gchar*) row->data - 1));
Elliot Lee's avatar
Elliot Lee committed
275
      else
Tim Janik's avatar
Tim Janik committed
276
	width = MAX (width, gdk_string_width (GTK_WIDGET (label)->style->font, row->data));
Elliot Lee's avatar
Elliot Lee committed
277 278
      row = row->next;
    }
Tim Janik's avatar
Tim Janik committed
279 280

  label->max_width = width;
Elliot Lee's avatar
Elliot Lee committed
281 282
  requisition->width = width + label->misc.xpad * 2;
  requisition->height = ((GTK_WIDGET (label)->style->font->ascent +
Tim Janik's avatar
Tim Janik committed
283 284 285
			  GTK_WIDGET (label)->style->font->descent + 2) *
			 g_slist_length(label->row) +
			 label->misc.ypad * 2);
Elliot Lee's avatar
Elliot Lee committed
286 287 288
}

static gint
Tim Janik's avatar
Tim Janik committed
289
gtk_label_expose (GtkWidget	 *widget,
Elliot Lee's avatar
Elliot Lee committed
290 291 292 293 294 295 296 297 298
		  GdkEventExpose *event)
{
  GtkLabel *label;
  GtkMisc *misc;
  GSList *row;
  gint state;
  gint offset;
  gint len;
  gint x, y;
Tim Janik's avatar
Tim Janik committed
299
  
Elliot Lee's avatar
Elliot Lee committed
300 301 302
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_LABEL (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);
Tim Janik's avatar
Tim Janik committed
303
  
Elliot Lee's avatar
Elliot Lee committed
304 305 306 307
  if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_MAPPED (widget))
    {
      label = GTK_LABEL (widget);
      misc = GTK_MISC (widget);
Tim Janik's avatar
Tim Janik committed
308
      
Elliot Lee's avatar
Elliot Lee committed
309
      state = widget->state;
Tim Janik's avatar
Tim Janik committed
310
      
311 312
      /*
       * GC Clipping
Elliot Lee's avatar
Elliot Lee committed
313
       */
314 315
      gdk_gc_set_clip_rectangle (widget->style->white_gc, &event->area);
      gdk_gc_set_clip_rectangle (widget->style->fg_gc[state], &event->area);
Tim Janik's avatar
Tim Janik committed
316
      
317 318 319 320 321 322 323 324 325 326 327 328 329
      /* We clear the whole allocation here so that if a partial
       * expose is triggered we don't just clear part and mess up
       * when the queued redraw comes along. (There will always
       * be a complete queued redraw when the needs_clear flag
       * is set.)
       */
      if (label->needs_clear)
	{
	  gdk_window_clear_area (widget->window,
				 widget->allocation.x,
				 widget->allocation.y,
				 widget->allocation.width,
				 widget->allocation.height);
Tim Janik's avatar
Tim Janik committed
330
	  
331 332
	  label->needs_clear = FALSE;
	}
Tim Janik's avatar
Tim Janik committed
333
      
334
      x = widget->allocation.x + misc->xpad +
Tim Janik's avatar
Tim Janik committed
335
	(widget->allocation.width - (label->max_width + label->misc.xpad * 2))
336
	* misc->xalign + 0.5;
Tim Janik's avatar
Tim Janik committed
337
      
338 339 340 341
      y = (widget->allocation.y * (1.0 - misc->yalign) +
	   (widget->allocation.y + widget->allocation.height -
	    (widget->requisition.height - misc->ypad * 2)) *
	   misc->yalign + widget->style->font->ascent) + 1.5;
Tim Janik's avatar
Tim Janik committed
342
      
343 344
      row = label->row;
      while (row && row->next)
Elliot Lee's avatar
Elliot Lee committed
345
	{
346
	  len = (gchar*) row->next->data - (gchar*) row->data - 1;
347
	  offset = 0;
Tim Janik's avatar
Tim Janik committed
348
	  
349
	  if (label->jtype == GTK_JUSTIFY_CENTER)
Tim Janik's avatar
Tim Janik committed
350 351
	    offset = (label->max_width - gdk_text_width (widget->style->font, row->data, len)) / 2;
	  
352
	  else if (label->jtype == GTK_JUSTIFY_RIGHT)
Tim Janik's avatar
Tim Janik committed
353 354
	    offset = (label->max_width - gdk_text_width (widget->style->font, row->data, len));
	  
355 356 357 358 359 360 361 362 363 364
	  if (state == GTK_STATE_INSENSITIVE)
	    gdk_draw_text (widget->window, widget->style->font,
			   widget->style->white_gc,
			   offset + x + 1, y + 1, row->data, len);
	  
	  gdk_draw_text (widget->window, widget->style->font,
			 widget->style->fg_gc[state],
			 offset + x, y, row->data, len);
	  row = row->next;
	  y += widget->style->font->ascent + widget->style->font->descent + 2;
Elliot Lee's avatar
Elliot Lee committed
365
	}
366 367 368 369 370 371 372
      
      /* 
       * COMMENT: we can avoid gdk_text_width() calls here storing in label->row
       * the widths of the rows calculated in gtk_label_set.
       * Once we have a wrapping interface we can support GTK_JUSTIFY_FILL.
       */
      offset = 0;
Tim Janik's avatar
Tim Janik committed
373
      
374
      if (label->jtype == GTK_JUSTIFY_CENTER)
Tim Janik's avatar
Tim Janik committed
375 376
	offset = (label->max_width - gdk_string_width (widget->style->font, row->data)) / 2;
      
377
      else if (label->jtype == GTK_JUSTIFY_RIGHT)
Tim Janik's avatar
Tim Janik committed
378 379
	offset = (label->max_width - gdk_string_width (widget->style->font, row->data));
      
380 381 382 383 384 385 386 387
      if (state == GTK_STATE_INSENSITIVE)
	gdk_draw_string (widget->window, widget->style->font,
			 widget->style->white_gc,
			 offset + x + 1, y + 1, row->data);
      
      gdk_draw_string (widget->window, widget->style->font,
		       widget->style->fg_gc[state],
		       offset + x, y, row->data);
Tim Janik's avatar
Tim Janik committed
388
      
389 390
      gdk_gc_set_clip_mask (widget->style->white_gc, NULL);
      gdk_gc_set_clip_mask (widget->style->fg_gc[state], NULL);
Tim Janik's avatar
Tim Janik committed
391
      
392
    }
Elliot Lee's avatar
Elliot Lee committed
393 394 395
  return TRUE;
}

396
static void 
Tim Janik's avatar
Tim Janik committed
397 398
gtk_label_state_changed (GtkWidget	*widget,
			 guint		 previous_state)
399
{
Owen Taylor's avatar
Owen Taylor committed
400
  if (GTK_WIDGET_DRAWABLE (widget))
Tim Janik's avatar
Tim Janik committed
401
    GTK_LABEL (widget)->needs_clear = TRUE;
402
}
Elliot Lee's avatar
Elliot Lee committed
403

404
static void 
Tim Janik's avatar
Tim Janik committed
405 406
gtk_label_style_set (GtkWidget	*widget,
		     GtkStyle	*previous_style)
407
{
Owen Taylor's avatar
Owen Taylor committed
408
  if (GTK_WIDGET_DRAWABLE (widget))
Tim Janik's avatar
Tim Janik committed
409
    GTK_LABEL (widget)->needs_clear = TRUE;
410
}
Elliot Lee's avatar
Elliot Lee committed
411