summaryrefslogtreecommitdiff
path: root/gtk/gtktextlayout.h
blob: 21e3d53e124701f1c030093ded40c0406cd6721a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
/* GTK - The GIMP Toolkit
 * gtktextlayout.h
 *
 * Copyright (c) 1992-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 * Copyright (c) 2000 Red Hat, Inc.
 * Tk->Gtk port by Havoc Pennington
 * Pango support by Owen Taylor
 *
 * This file can be used under your choice of two licenses, the LGPL
 * and the original Tk license.
 *
 * LGPL:
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Original Tk license:
 *
 * This software is copyrighted by the Regents of the University of
 * California, Sun Microsystems, Inc., and other parties.  The
 * following terms apply to all files associated with the software
 * unless explicitly disclaimed in individual files.
 *
 * The authors hereby grant permission to use, copy, modify,
 * distribute, and license this software and its documentation for any
 * purpose, provided that existing copyright notices are retained in
 * all copies and that this notice is included verbatim in any
 * distributions. No written agreement, license, or royalty fee is
 * required for any of the authorized uses.  Modifications to this
 * software may be copyrighted by their authors and need not follow
 * the licensing terms described here, provided that the new terms are
 * clearly indicated on the first page of each file where they apply.
 *
 * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
 * DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
 * OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
 * NON-INFRINGEMENT.  THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
 * AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
 * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 *
 * GOVERNMENT USE: If you are acquiring this software on behalf of the
 * U.S. government, the Government shall have only "Restricted Rights"
 * in the software and related documentation as defined in the Federal
 * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2).  If you
 * are acquiring the software on behalf of the Department of Defense,
 * the software shall be classified as "Commercial Computer Software"
 * and the Government shall have only "Restricted Rights" as defined
 * in Clause 252.227-7013 (c) (1) of DFARs.  Notwithstanding the
 * foregoing, the authors grant the U.S. Government and others acting
 * in its behalf permission to use and distribute the software in
 * accordance with the terms specified in this license.
 *
 */
/*
 * 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/.
 */

#ifndef __GTK_TEXT_LAYOUT_H__
#define __GTK_TEXT_LAYOUT_H__

/* This is a "semi-private" header; it is intended for
 * use by the text widget, and the text canvas item,
 * but that's all. We may have to install it so the
 * canvas item can use it, but users are not supposed
 * to use it.
 */
#ifndef GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
#error "You are not supposed to be including this file; the equivalent public API is in gtktextview.h"
#endif

#include <gtk/gtktextbuffer.h>
#include <gtk/gtktextiter.h>

G_BEGIN_DECLS

/* forward declarations that have to be here to avoid including
 * gtktextbtree.h
 */
typedef struct _GtkTextLine     GtkTextLine;
typedef struct _GtkTextLineData GtkTextLineData;

#define GTK_TYPE_TEXT_LAYOUT             (gtk_text_layout_get_type ())
#define GTK_TEXT_LAYOUT(obj)             (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_TEXT_LAYOUT, GtkTextLayout))
#define GTK_TEXT_LAYOUT_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_TEXT_LAYOUT, GtkTextLayoutClass))
#define GTK_IS_TEXT_LAYOUT(obj)          (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_TEXT_LAYOUT))
#define GTK_IS_TEXT_LAYOUT_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_TEXT_LAYOUT))
#define GTK_TEXT_LAYOUT_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_TEXT_LAYOUT, GtkTextLayoutClass))

typedef struct _GtkTextLayout         GtkTextLayout;
typedef struct _GtkTextLayoutClass    GtkTextLayoutClass;
typedef struct _GtkTextLineDisplay    GtkTextLineDisplay;
typedef struct _GtkTextCursorDisplay  GtkTextCursorDisplay;
typedef struct _GtkTextAttrAppearance GtkTextAttrAppearance;

struct _GtkTextLayout
{
  GObject parent_instance;

  /* width of the display area on-screen,
   * i.e. pixels we should wrap to fit inside. */
  gint screen_width;

  /* width/height of the total logical area being layed out */
  gint width;
  gint height;

  /* Pixel offsets from the left and from the top to be used when we
   * draw; these allow us to create left/top margins. We don't need
   * anything special for bottom/right margins, because those don't
   * affect drawing.
   */
  /* gint left_edge; */
  /* gint top_edge; */

  GtkTextBuffer *buffer;

  /* Default style used if no tags override it */
  GtkTextAttributes *default_style;

  /* Pango contexts used for creating layouts */
  PangoContext *ltr_context;
  PangoContext *rtl_context;

  /* A cache of one style; this is used to ensure
   * we don't constantly regenerate the style
   * over long runs with the same style. */
  GtkTextAttributes *one_style_cache;

  /* A cache of one line display. Getting the same line
   * many times in a row is the most common case.
   */
  GtkTextLineDisplay *one_display_cache;

  /* Whether we are allowed to wrap right now */
  gint wrap_loop_count;
  
  /* Whether to show the insertion cursor */
  guint cursor_visible : 1;

  /* For what GtkTextDirection to draw cursor GTK_TEXT_DIR_NONE -
   * means draw both cursors.
   */
  guint cursor_direction : 2;

  /* The keyboard direction is used to default the alignment when
     there are no strong characters.
  */
  guint keyboard_direction : 2;

  /* The preedit string and attributes, if any */

  gchar *preedit_string;
  PangoAttrList *preedit_attrs;
  gint preedit_len;
  gint preedit_cursor;
};

struct _GtkTextLayoutClass
{
  GObjectClass parent_class;

  /* Some portion of the layout was invalidated
   */
  void  (*invalidated)  (GtkTextLayout *layout);

  /* A range of the layout changed appearance and possibly height
   */
  void  (*changed)              (GtkTextLayout     *layout,
                                 gint               y,
                                 gint               old_height,
                                 gint               new_height);
  GtkTextLineData* (*wrap)      (GtkTextLayout     *layout,
                                 GtkTextLine       *line,
                                 GtkTextLineData   *line_data); /* may be NULL */
  void  (*get_log_attrs)        (GtkTextLayout     *layout,
                                 GtkTextLine       *line,
                                 PangoLogAttr     **attrs,
                                 gint              *n_attrs);
  void  (*invalidate)           (GtkTextLayout     *layout,
                                 const GtkTextIter *start,
                                 const GtkTextIter *end);
  void  (*free_line_data)       (GtkTextLayout     *layout,
                                 GtkTextLine       *line,
                                 GtkTextLineData   *line_data);

  void (*allocate_child)        (GtkTextLayout     *layout,
                                 GtkWidget         *child,
                                 gint               x,
                                 gint               y);

  /* Padding for future expansion */
  void (*_gtk_reserved1) (void);
  void (*_gtk_reserved2) (void);
  void (*_gtk_reserved3) (void);
  void (*_gtk_reserved4) (void);
};

struct _GtkTextAttrAppearance
{
  PangoAttribute attr;
  GtkTextAppearance appearance;
};
struct _GtkTextCursorDisplay
{
  gint x;
  gint y;
  gint height;
  guint is_strong : 1;
  guint is_weak : 1;
};
struct _GtkTextLineDisplay
{
  PangoLayout *layout;
  GSList *cursors;
  GSList *shaped_objects;	/* Only for backwards compatibility */
  
  GtkTextDirection direction;

  gint width;                   /* Width of layout */
  gint total_width;             /* width - margins, if no width set on layout, if width set on layout, -1 */
  gint height;
  /* Amount layout is shifted from left edge - this is the left margin
   * plus any other factors, such as alignment or indentation.
   */
  gint x_offset;
  gint left_margin;
  gint right_margin;
  gint top_margin;
  gint bottom_margin;
  gint insert_index;		/* Byte index of insert cursor within para or -1 */

  gboolean size_only;
  GtkTextLine *line;
  
  GdkColor *pg_bg_color;
};

extern PangoAttrType gtk_text_attr_appearance_type;

GType         gtk_text_layout_get_type    (void) G_GNUC_CONST;

GtkTextLayout*     gtk_text_layout_new                   (void);
void               gtk_text_layout_set_buffer            (GtkTextLayout     *layout,
							  GtkTextBuffer     *buffer);
GtkTextBuffer     *gtk_text_layout_get_buffer            (GtkTextLayout     *layout);
void               gtk_text_layout_set_default_style     (GtkTextLayout     *layout,
							  GtkTextAttributes *values);
void               gtk_text_layout_set_contexts          (GtkTextLayout     *layout,
							  PangoContext      *ltr_context,
							  PangoContext      *rtl_context);
void               gtk_text_layout_set_cursor_direction  (GtkTextLayout     *layout,
                                                          GtkTextDirection   direction);
void               gtk_text_layout_set_keyboard_direction (GtkTextLayout     *layout,
							   GtkTextDirection keyboard_dir);
void               gtk_text_layout_default_style_changed (GtkTextLayout     *layout);

void gtk_text_layout_set_screen_width       (GtkTextLayout     *layout,
                                             gint               width);
void gtk_text_layout_set_preedit_string     (GtkTextLayout     *layout,
 					     const gchar       *preedit_string,
 					     PangoAttrList     *preedit_attrs,
 					     gint               cursor_pos);

void     gtk_text_layout_set_cursor_visible (GtkTextLayout     *layout,
                                             gboolean           cursor_visible);
gboolean gtk_text_layout_get_cursor_visible (GtkTextLayout     *layout);

/* Getting the size or the lines potentially results in a call to
 * recompute, which is pretty massively expensive. Thus it should
 * basically only be done in an idle handler.
 *
 * Long-term, we would really like to be able to do these without
 * a full recompute so they may get cheaper over time.
 */
void    gtk_text_layout_get_size  (GtkTextLayout  *layout,
                                   gint           *width,
                                   gint           *height);
GSList* gtk_text_layout_get_lines (GtkTextLayout  *layout,
                                   /* [top_y, bottom_y) */
                                   gint            top_y,
                                   gint            bottom_y,
                                   gint           *first_line_y);

void gtk_text_layout_wrap_loop_start (GtkTextLayout *layout);
void gtk_text_layout_wrap_loop_end   (GtkTextLayout *layout);

GtkTextLineDisplay* gtk_text_layout_get_line_display  (GtkTextLayout      *layout,
                                                       GtkTextLine        *line,
                                                       gboolean            size_only);
void                gtk_text_layout_free_line_display (GtkTextLayout      *layout,
                                                       GtkTextLineDisplay *display);

void gtk_text_layout_get_line_at_y     (GtkTextLayout     *layout,
                                        GtkTextIter       *target_iter,
                                        gint               y,
                                        gint              *line_top);
void gtk_text_layout_get_iter_at_pixel (GtkTextLayout     *layout,
                                        GtkTextIter       *iter,
                                        gint               x,
                                        gint               y);
void gtk_text_layout_get_iter_at_position (GtkTextLayout     *layout,
					   GtkTextIter       *iter,
					   gint              *trailing,
					   gint               x,
					   gint               y);
void gtk_text_layout_invalidate        (GtkTextLayout     *layout,
                                        const GtkTextIter *start,
                                        const GtkTextIter *end);
void gtk_text_layout_free_line_data    (GtkTextLayout     *layout,
                                        GtkTextLine       *line,
                                        GtkTextLineData   *line_data);

gboolean gtk_text_layout_is_valid        (GtkTextLayout *layout);
void     gtk_text_layout_validate_yrange (GtkTextLayout *layout,
                                          GtkTextIter   *anchor_line,
                                          gint           y0_,
                                          gint           y1_);
void     gtk_text_layout_validate        (GtkTextLayout *layout,
                                          gint           max_pixels);

/* This function should return the passed-in line data,
 * OR remove the existing line data from the line, and
 * return a NEW line data after adding it to the line.
 * That is, invariant after calling the callback is that
 * there should be exactly one line data for this view
 * stored on the btree line.
 */
GtkTextLineData* gtk_text_layout_wrap  (GtkTextLayout   *layout,
                                        GtkTextLine     *line,
                                        GtkTextLineData *line_data); /* may be NULL */
void     gtk_text_layout_changed              (GtkTextLayout     *layout,
                                               gint               y,
                                               gint               old_height,
                                               gint               new_height);
void     gtk_text_layout_get_iter_location    (GtkTextLayout     *layout,
                                               const GtkTextIter *iter,
                                               GdkRectangle      *rect);
void     gtk_text_layout_get_line_yrange      (GtkTextLayout     *layout,
                                               const GtkTextIter *iter,
                                               gint              *y,
                                               gint              *height);
void     _gtk_text_layout_get_line_xrange     (GtkTextLayout     *layout,
                                               const GtkTextIter *iter,
                                               gint              *x,
                                               gint              *width);
void     gtk_text_layout_get_cursor_locations (GtkTextLayout     *layout,
                                               GtkTextIter       *iter,
                                               GdkRectangle      *strong_pos,
                                               GdkRectangle      *weak_pos);
gboolean gtk_text_layout_clamp_iter_to_vrange (GtkTextLayout     *layout,
                                               GtkTextIter       *iter,
                                               gint               top,
                                               gint               bottom);

gboolean gtk_text_layout_move_iter_to_line_end      (GtkTextLayout *layout,
                                                     GtkTextIter   *iter,
                                                     gint           direction);
gboolean gtk_text_layout_move_iter_to_previous_line (GtkTextLayout *layout,
                                                     GtkTextIter   *iter);
gboolean gtk_text_layout_move_iter_to_next_line     (GtkTextLayout *layout,
                                                     GtkTextIter   *iter);
void     gtk_text_layout_move_iter_to_x             (GtkTextLayout *layout,
                                                     GtkTextIter   *iter,
                                                     gint           x);
gboolean gtk_text_layout_move_iter_visually         (GtkTextLayout *layout,
                                                     GtkTextIter   *iter,
                                                     gint           count);

gboolean gtk_text_layout_iter_starts_line           (GtkTextLayout       *layout,
                                                     const GtkTextIter   *iter);

void     gtk_text_layout_get_iter_at_line           (GtkTextLayout *layout,
                                                     GtkTextIter    *iter,
                                                     GtkTextLine    *line,
                                                     gint            byte_offset);

/* Don't use these. Use gtk_text_view_add_child_at_anchor().
 * These functions are defined in gtktextchild.c, but here
 * since they are semi-public and require GtkTextLayout to
 * be declared.
 */
void gtk_text_child_anchor_register_child   (GtkTextChildAnchor *anchor,
                                             GtkWidget          *child,
                                             GtkTextLayout      *layout);
void gtk_text_child_anchor_unregister_child (GtkTextChildAnchor *anchor,
                                             GtkWidget          *child);

void gtk_text_child_anchor_queue_resize     (GtkTextChildAnchor *anchor,
                                             GtkTextLayout      *layout);

void gtk_text_anchored_child_set_layout     (GtkWidget          *child,
                                             GtkTextLayout      *layout);

void gtk_text_layout_spew (GtkTextLayout *layout);

G_END_DECLS

#endif  /* __GTK_TEXT_LAYOUT_H__ */