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gtk/libgail-util/gailtextutil.c
Javier Jardón 9d0febc9a6 Change FSF Address
2012-02-27 17:06:11 +00:00

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26 KiB
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/* GAIL - The GNOME Accessibility Implementation Library
* Copyright 2001 Sun Microsystems Inc.
*
* 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdlib.h>
#include "gailtextutil.h"
/**
* SECTION:gailtextutil
* @Short_description: GailTextUtil is a utility class which can be used to
* implement some of the #AtkText functions for accessible objects
* which implement #AtkText.
* @Title: GailTextUtil
*
* GailTextUtil is a utility class which can be used to implement the
* #AtkText functions which get text for accessible objects which implement
* #AtkText.
*
* In GAIL it is used by the accsesible objects for #GnomeCanvasText, #GtkEntry,
* #GtkLabel, #GtkCellRendererText and #GtkTextView.
*/
static void gail_text_util_class_init (GailTextUtilClass *klass);
static void gail_text_util_init (GailTextUtil *textutil);
static void gail_text_util_finalize (GObject *object);
static void get_pango_text_offsets (PangoLayout *layout,
GtkTextBuffer *buffer,
GailOffsetType function,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset,
GtkTextIter *start_iter,
GtkTextIter *end_iter);
static GObjectClass *parent_class = NULL;
GType
gail_text_util_get_type(void)
{
static GType type = 0;
if (!type)
{
const GTypeInfo tinfo =
{
sizeof (GailTextUtilClass),
(GBaseInitFunc) NULL, /* base init */
(GBaseFinalizeFunc) NULL, /* base finalize */
(GClassInitFunc) gail_text_util_class_init,
(GClassFinalizeFunc) NULL, /* class finalize */
NULL, /* class data */
sizeof(GailTextUtil),
0, /* nb preallocs */
(GInstanceInitFunc) gail_text_util_init,
NULL, /* value table */
};
type = g_type_register_static (G_TYPE_OBJECT, "GailTextUtil", &tinfo, 0);
}
return type;
}
/**
* gail_text_util_new:
*
* This function creates a new GailTextUtil object.
*
* Returns: the GailTextUtil object
**/
GailTextUtil*
gail_text_util_new (void)
{
return GAIL_TEXT_UTIL (g_object_new (GAIL_TYPE_TEXT_UTIL, NULL));
}
static void
gail_text_util_init (GailTextUtil *textutil)
{
textutil->buffer = NULL;
}
static void
gail_text_util_class_init (GailTextUtilClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = gail_text_util_finalize;
}
static void
gail_text_util_finalize (GObject *object)
{
GailTextUtil *textutil = GAIL_TEXT_UTIL (object);
if (textutil->buffer)
g_object_unref (textutil->buffer);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/**
* gail_text_util_text_setup:
* @textutil: The #GailTextUtil to be initialized.
* @text: A gchar* which points to the text to be stored in the GailTextUtil
*
* This function initializes the GailTextUtil with the specified character string,
**/
void
gail_text_util_text_setup (GailTextUtil *textutil,
const gchar *text)
{
g_return_if_fail (GAIL_IS_TEXT_UTIL (textutil));
if (textutil->buffer)
{
if (!text)
{
g_object_unref (textutil->buffer);
textutil->buffer = NULL;
return;
}
}
else
{
textutil->buffer = gtk_text_buffer_new (NULL);
}
gtk_text_buffer_set_text (textutil->buffer, text, -1);
}
/**
* gail_text_util_buffer_setup:
* @textutil: A #GailTextUtil to be initialized
* @buffer: The #GtkTextBuffer which identifies the text to be stored in the GailUtil.
*
* This function initializes the GailTextUtil with the specified GtkTextBuffer
**/
void
gail_text_util_buffer_setup (GailTextUtil *textutil,
GtkTextBuffer *buffer)
{
g_return_if_fail (GAIL_IS_TEXT_UTIL (textutil));
textutil->buffer = g_object_ref (buffer);
}
/**
* gail_text_util_get_text:
* @textutil: A #GailTextUtil
* @layout: A gpointer which is a PangoLayout, a GtkTreeView of NULL
* @function: An enumeration specifying whether to return the text before, at, or
* after the offset.
* @boundary_type: The boundary type.
* @offset: The offset of the text in the GailTextUtil
* @start_offset: Address of location in which the start offset is returned
* @end_offset: Address of location in which the end offset is returned
*
* This function gets the requested substring from the text in the GtkTextUtil.
* The layout is used only for getting the text on a line. The value is NULL
* for a GtkTextView which is not wrapped, is a GtkTextView for a GtkTextView
* which is wrapped and is a PangoLayout otherwise.
*
* Returns: the substring requested
**/
gchar*
gail_text_util_get_text (GailTextUtil *textutil,
gpointer layout,
GailOffsetType function,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
GtkTextIter start, end;
gint line_number;
GtkTextBuffer *buffer;
g_return_val_if_fail (GAIL_IS_TEXT_UTIL (textutil), NULL);
buffer = textutil->buffer;
if (buffer == NULL)
{
*start_offset = 0;
*end_offset = 0;
return NULL;
}
if (!gtk_text_buffer_get_char_count (buffer))
{
*start_offset = 0;
*end_offset = 0;
return g_strdup ("");
}
gtk_text_buffer_get_iter_at_offset (buffer, &start, offset);
end = start;
switch (function)
{
case GAIL_BEFORE_OFFSET:
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_CHAR:
gtk_text_iter_backward_char(&start);
break;
case ATK_TEXT_BOUNDARY_WORD_START:
if (!gtk_text_iter_starts_word (&start))
gtk_text_iter_backward_word_start (&start);
end = start;
gtk_text_iter_backward_word_start(&start);
break;
case ATK_TEXT_BOUNDARY_WORD_END:
if (gtk_text_iter_inside_word (&start) &&
!gtk_text_iter_starts_word (&start))
gtk_text_iter_backward_word_start (&start);
while (!gtk_text_iter_ends_word (&start))
{
if (!gtk_text_iter_backward_char (&start))
break;
}
end = start;
gtk_text_iter_backward_word_start(&start);
while (!gtk_text_iter_ends_word (&start))
{
if (!gtk_text_iter_backward_char (&start))
break;
}
break;
case ATK_TEXT_BOUNDARY_SENTENCE_START:
if (!gtk_text_iter_starts_sentence (&start))
gtk_text_iter_backward_sentence_start (&start);
end = start;
gtk_text_iter_backward_sentence_start (&start);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_END:
if (gtk_text_iter_inside_sentence (&start) &&
!gtk_text_iter_starts_sentence (&start))
gtk_text_iter_backward_sentence_start (&start);
while (!gtk_text_iter_ends_sentence (&start))
{
if (!gtk_text_iter_backward_char (&start))
break;
}
end = start;
gtk_text_iter_backward_sentence_start (&start);
while (!gtk_text_iter_ends_sentence (&start))
{
if (!gtk_text_iter_backward_char (&start))
break;
}
break;
case ATK_TEXT_BOUNDARY_LINE_START:
if (layout == NULL)
{
line_number = gtk_text_iter_get_line (&start);
if (line_number == 0)
{
gtk_text_buffer_get_iter_at_offset (buffer,
&start, 0);
}
else
{
gtk_text_iter_backward_line (&start);
gtk_text_iter_forward_line (&start);
}
end = start;
gtk_text_iter_backward_line (&start);
}
else if GTK_IS_TEXT_VIEW (layout)
{
GtkTextView *view = GTK_TEXT_VIEW (layout);
gtk_text_view_backward_display_line_start (view, &start);
end = start;
gtk_text_view_backward_display_line (view, &start);
}
else if (PANGO_IS_LAYOUT (layout))
get_pango_text_offsets (PANGO_LAYOUT (layout),
buffer,
function,
boundary_type,
offset,
start_offset,
end_offset,
&start,
&end);
break;
case ATK_TEXT_BOUNDARY_LINE_END:
if (layout == NULL)
{
line_number = gtk_text_iter_get_line (&start);
if (line_number == 0)
{
gtk_text_buffer_get_iter_at_offset (buffer,
&start, 0);
end = start;
}
else
{
gtk_text_iter_backward_line (&start);
end = start;
while (!gtk_text_iter_ends_line (&start))
{
if (!gtk_text_iter_backward_char (&start))
break;
}
gtk_text_iter_forward_to_line_end (&end);
}
}
else if GTK_IS_TEXT_VIEW (layout)
{
GtkTextView *view = GTK_TEXT_VIEW (layout);
gtk_text_view_backward_display_line_start (view, &start);
if (!gtk_text_iter_is_start (&start))
{
gtk_text_view_backward_display_line (view, &start);
end = start;
if (!gtk_text_iter_is_start (&start))
{
gtk_text_view_backward_display_line (view, &start);
gtk_text_view_forward_display_line_end (view, &start);
}
gtk_text_view_forward_display_line_end (view, &end);
}
else
{
end = start;
}
}
else if (PANGO_IS_LAYOUT (layout))
get_pango_text_offsets (PANGO_LAYOUT (layout),
buffer,
function,
boundary_type,
offset,
start_offset,
end_offset,
&start,
&end);
break;
}
break;
case GAIL_AT_OFFSET:
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_CHAR:
gtk_text_iter_forward_char (&end);
break;
case ATK_TEXT_BOUNDARY_WORD_START:
if (!gtk_text_iter_starts_word (&start))
gtk_text_iter_backward_word_start (&start);
if (gtk_text_iter_inside_word (&end))
gtk_text_iter_forward_word_end (&end);
while (!gtk_text_iter_starts_word (&end))
{
if (!gtk_text_iter_forward_char (&end))
break;
}
break;
case ATK_TEXT_BOUNDARY_WORD_END:
if (gtk_text_iter_inside_word (&start) &&
!gtk_text_iter_starts_word (&start))
gtk_text_iter_backward_word_start (&start);
while (!gtk_text_iter_ends_word (&start))
{
if (!gtk_text_iter_backward_char (&start))
break;
}
gtk_text_iter_forward_word_end (&end);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_START:
if (!gtk_text_iter_starts_sentence (&start))
gtk_text_iter_backward_sentence_start (&start);
if (gtk_text_iter_inside_sentence (&end))
gtk_text_iter_forward_sentence_end (&end);
while (!gtk_text_iter_starts_sentence (&end))
{
if (!gtk_text_iter_forward_char (&end))
break;
}
break;
case ATK_TEXT_BOUNDARY_SENTENCE_END:
if (gtk_text_iter_inside_sentence (&start) &&
!gtk_text_iter_starts_sentence (&start))
gtk_text_iter_backward_sentence_start (&start);
while (!gtk_text_iter_ends_sentence (&start))
{
if (!gtk_text_iter_backward_char (&start))
break;
}
gtk_text_iter_forward_sentence_end (&end);
break;
case ATK_TEXT_BOUNDARY_LINE_START:
if (layout == NULL)
{
line_number = gtk_text_iter_get_line (&start);
if (line_number == 0)
{
gtk_text_buffer_get_iter_at_offset (buffer,
&start, 0);
}
else
{
gtk_text_iter_backward_line (&start);
gtk_text_iter_forward_line (&start);
}
gtk_text_iter_forward_line (&end);
}
else if GTK_IS_TEXT_VIEW (layout)
{
GtkTextView *view = GTK_TEXT_VIEW (layout);
gtk_text_view_backward_display_line_start (view, &start);
/*
* The call to gtk_text_iter_forward_to_end() is needed
* because of bug 81960
*/
if (!gtk_text_view_forward_display_line (view, &end))
gtk_text_iter_forward_to_end (&end);
}
else if PANGO_IS_LAYOUT (layout)
get_pango_text_offsets (PANGO_LAYOUT (layout),
buffer,
function,
boundary_type,
offset,
start_offset,
end_offset,
&start,
&end);
break;
case ATK_TEXT_BOUNDARY_LINE_END:
if (layout == NULL)
{
line_number = gtk_text_iter_get_line (&start);
if (line_number == 0)
{
gtk_text_buffer_get_iter_at_offset (buffer,
&start, 0);
}
else
{
gtk_text_iter_backward_line (&start);
gtk_text_iter_forward_line (&start);
}
while (!gtk_text_iter_ends_line (&start))
{
if (!gtk_text_iter_backward_char (&start))
break;
}
gtk_text_iter_forward_to_line_end (&end);
}
else if GTK_IS_TEXT_VIEW (layout)
{
GtkTextView *view = GTK_TEXT_VIEW (layout);
gtk_text_view_backward_display_line_start (view, &start);
if (!gtk_text_iter_is_start (&start))
{
gtk_text_view_backward_display_line (view, &start);
gtk_text_view_forward_display_line_end (view, &start);
}
gtk_text_view_forward_display_line_end (view, &end);
}
else if PANGO_IS_LAYOUT (layout)
get_pango_text_offsets (PANGO_LAYOUT (layout),
buffer,
function,
boundary_type,
offset,
start_offset,
end_offset,
&start,
&end);
break;
}
break;
case GAIL_AFTER_OFFSET:
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_CHAR:
gtk_text_iter_forward_char(&start);
gtk_text_iter_forward_chars(&end, 2);
break;
case ATK_TEXT_BOUNDARY_WORD_START:
if (gtk_text_iter_inside_word (&end))
gtk_text_iter_forward_word_end (&end);
while (!gtk_text_iter_starts_word (&end))
{
if (!gtk_text_iter_forward_char (&end))
break;
}
start = end;
if (!gtk_text_iter_is_end (&end))
{
gtk_text_iter_forward_word_end (&end);
while (!gtk_text_iter_starts_word (&end))
{
if (!gtk_text_iter_forward_char (&end))
break;
}
}
break;
case ATK_TEXT_BOUNDARY_WORD_END:
gtk_text_iter_forward_word_end (&end);
start = end;
if (!gtk_text_iter_is_end (&end))
gtk_text_iter_forward_word_end (&end);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_START:
if (gtk_text_iter_inside_sentence (&end))
gtk_text_iter_forward_sentence_end (&end);
while (!gtk_text_iter_starts_sentence (&end))
{
if (!gtk_text_iter_forward_char (&end))
break;
}
start = end;
if (!gtk_text_iter_is_end (&end))
{
gtk_text_iter_forward_sentence_end (&end);
while (!gtk_text_iter_starts_sentence (&end))
{
if (!gtk_text_iter_forward_char (&end))
break;
}
}
break;
case ATK_TEXT_BOUNDARY_SENTENCE_END:
gtk_text_iter_forward_sentence_end (&end);
start = end;
if (!gtk_text_iter_is_end (&end))
gtk_text_iter_forward_sentence_end (&end);
break;
case ATK_TEXT_BOUNDARY_LINE_START:
if (layout == NULL)
{
gtk_text_iter_forward_line (&end);
start = end;
gtk_text_iter_forward_line (&end);
}
else if GTK_IS_TEXT_VIEW (layout)
{
GtkTextView *view = GTK_TEXT_VIEW (layout);
gtk_text_view_forward_display_line (view, &end);
start = end;
gtk_text_view_forward_display_line (view, &end);
}
else if (PANGO_IS_LAYOUT (layout))
get_pango_text_offsets (PANGO_LAYOUT (layout),
buffer,
function,
boundary_type,
offset,
start_offset,
end_offset,
&start,
&end);
break;
case ATK_TEXT_BOUNDARY_LINE_END:
if (layout == NULL)
{
gtk_text_iter_forward_line (&start);
end = start;
if (!gtk_text_iter_is_end (&start))
{
while (!gtk_text_iter_ends_line (&start))
{
if (!gtk_text_iter_backward_char (&start))
break;
}
gtk_text_iter_forward_to_line_end (&end);
}
}
else if GTK_IS_TEXT_VIEW (layout)
{
GtkTextView *view = GTK_TEXT_VIEW (layout);
gtk_text_view_forward_display_line_end (view, &end);
start = end;
gtk_text_view_forward_display_line (view, &end);
gtk_text_view_forward_display_line_end (view, &end);
}
else if (PANGO_IS_LAYOUT (layout))
get_pango_text_offsets (PANGO_LAYOUT (layout),
buffer,
function,
boundary_type,
offset,
start_offset,
end_offset,
&start,
&end);
break;
}
break;
}
*start_offset = gtk_text_iter_get_offset (&start);
*end_offset = gtk_text_iter_get_offset (&end);
return gtk_text_buffer_get_text (buffer, &start, &end, FALSE);
}
/**
* gail_text_util_get_substring:
* @textutil: A #GailTextUtil
* @start_pos: The start position of the substring
* @end_pos: The end position of the substring.
*
* Gets the substring indicated by @start_pos and @end_pos
*
* Returns: the substring indicated by @start_pos and @end_pos
**/
gchar*
gail_text_util_get_substring (GailTextUtil *textutil,
gint start_pos,
gint end_pos)
{
GtkTextIter start, end;
GtkTextBuffer *buffer;
g_return_val_if_fail(GAIL_IS_TEXT_UTIL (textutil), NULL);
buffer = textutil->buffer;
if (buffer == NULL)
return NULL;
gtk_text_buffer_get_iter_at_offset (buffer, &start, start_pos);
if (end_pos < 0)
gtk_text_buffer_get_end_iter (buffer, &end);
else
gtk_text_buffer_get_iter_at_offset (buffer, &end, end_pos);
return gtk_text_buffer_get_text (buffer, &start, &end, FALSE);
}
static void
get_pango_text_offsets (PangoLayout *layout,
GtkTextBuffer *buffer,
GailOffsetType function,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset,
GtkTextIter *start_iter,
GtkTextIter *end_iter)
{
PangoLayoutIter *iter;
PangoLayoutLine *line, *prev_line = NULL, *prev_prev_line = NULL;
gint index, start_index, end_index;
const gchar *text;
gboolean found = FALSE;
text = pango_layout_get_text (layout);
index = g_utf8_offset_to_pointer (text, offset) - text;
iter = pango_layout_get_iter (layout);
do
{
line = pango_layout_iter_get_line (iter);
start_index = line->start_index;
end_index = start_index + line->length;
if (index >= start_index && index <= end_index)
{
/*
* Found line for offset
*/
switch (function)
{
case GAIL_BEFORE_OFFSET:
/*
* We want the previous line
*/
if (prev_line)
{
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_LINE_START:
end_index = start_index;
start_index = prev_line->start_index;
break;
case ATK_TEXT_BOUNDARY_LINE_END:
if (prev_prev_line)
start_index = prev_prev_line->start_index +
prev_prev_line->length;
end_index = prev_line->start_index + prev_line->length;
break;
default:
g_assert_not_reached();
}
}
else
start_index = end_index = 0;
break;
case GAIL_AT_OFFSET:
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_LINE_START:
if (pango_layout_iter_next_line (iter))
end_index = pango_layout_iter_get_line (iter)->start_index;
break;
case ATK_TEXT_BOUNDARY_LINE_END:
if (prev_line)
start_index = prev_line->start_index +
prev_line->length;
break;
default:
g_assert_not_reached();
}
break;
case GAIL_AFTER_OFFSET:
/*
* We want the next line
*/
if (pango_layout_iter_next_line (iter))
{
line = pango_layout_iter_get_line (iter);
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_LINE_START:
start_index = line->start_index;
if (pango_layout_iter_next_line (iter))
end_index = pango_layout_iter_get_line (iter)->start_index;
else
end_index = start_index + line->length;
break;
case ATK_TEXT_BOUNDARY_LINE_END:
start_index = end_index;
end_index = line->start_index + line->length;
break;
default:
g_assert_not_reached();
}
}
else
start_index = end_index;
break;
}
found = TRUE;
break;
}
prev_prev_line = prev_line;
prev_line = line;
}
while (pango_layout_iter_next_line (iter));
if (!found)
{
start_index = prev_line->start_index + prev_line->length;
end_index = start_index;
}
pango_layout_iter_free (iter);
*start_offset = g_utf8_pointer_to_offset (text, text + start_index);
*end_offset = g_utf8_pointer_to_offset (text, text + end_index);
gtk_text_buffer_get_iter_at_offset (buffer, start_iter, *start_offset);
gtk_text_buffer_get_iter_at_offset (buffer, end_iter, *end_offset);
}
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