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gtk2/gtk/gtkpango.c
Matthias Clasen c3d96ff2c0 Improve AtkText implementations 
There was some regressions from the recent display line fix;
while fixing it improve the test coverage and make GtkEntry
and GtkTextView return identical results.
2011-11-19 19:28:48 -05:00

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/* gtkpango.c - pango-related utilities
*
* Copyright (c) 2010 Red Hat, Inc.
*
* 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.
*/
/*
* 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/.
*/
#include "config.h"
#include "gtkpango.h"
#include <pango/pangocairo.h>
#include "gtkintl.h"
#define GTK_TYPE_FILL_LAYOUT_RENDERER (_gtk_fill_layout_renderer_get_type())
#define GTK_FILL_LAYOUT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GTK_TYPE_FILL_LAYOUT_RENDERER, GtkFillLayoutRenderer))
#define GTK_IS_FILL_LAYOUT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GTK_TYPE_FILL_LAYOUT_RENDERER))
#define GTK_FILL_LAYOUT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_FILL_LAYOUT_RENDERER, GtkFillLayoutRendererClass))
#define GTK_IS_FILL_LAYOUT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_FILL_LAYOUT_RENDERER))
#define GTK_FILL_LAYOUT_RENDERER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_FILL_LAYOUT_RENDERER, GtkFillLayoutRendererClass))
typedef struct _GtkFillLayoutRenderer GtkFillLayoutRenderer;
typedef struct _GtkFillLayoutRendererClass GtkFillLayoutRendererClass;
struct _GtkFillLayoutRenderer
{
PangoRenderer parent_instance;
cairo_t *cr;
};
struct _GtkFillLayoutRendererClass
{
PangoRendererClass parent_class;
};
G_DEFINE_TYPE (GtkFillLayoutRenderer, _gtk_fill_layout_renderer, PANGO_TYPE_RENDERER)
static void
gtk_fill_layout_renderer_draw_glyphs (PangoRenderer *renderer,
PangoFont *font,
PangoGlyphString *glyphs,
int x,
int y)
{
GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
pango_cairo_show_glyph_string (text_renderer->cr, font, glyphs);
}
static void
gtk_fill_layout_renderer_draw_glyph_item (PangoRenderer *renderer,
const char *text,
PangoGlyphItem *glyph_item,
int x,
int y)
{
GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
pango_cairo_show_glyph_item (text_renderer->cr, text, glyph_item);
}
static void
gtk_fill_layout_renderer_draw_rectangle (PangoRenderer *renderer,
PangoRenderPart part,
int x,
int y,
int width,
int height)
{
GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
if (part == PANGO_RENDER_PART_BACKGROUND)
return;
cairo_rectangle (text_renderer->cr,
(double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
cairo_fill (text_renderer->cr);
}
static void
gtk_fill_layout_renderer_draw_trapezoid (PangoRenderer *renderer,
PangoRenderPart part,
double y1_,
double x11,
double x21,
double y2,
double x12,
double x22)
{
GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
cairo_matrix_t matrix;
cairo_t *cr;
cr = text_renderer->cr;
cairo_save (cr);
/* use identity scale, but keep translation */
cairo_get_matrix (cr, &matrix);
matrix.xx = matrix.yy = 1;
matrix.xy = matrix.yx = 0;
cairo_set_matrix (cr, &matrix);
cairo_move_to (cr, x11, y1_);
cairo_line_to (cr, x21, y1_);
cairo_line_to (cr, x22, y2);
cairo_line_to (cr, x12, y2);
cairo_close_path (cr);
cairo_fill (cr);
cairo_restore (cr);
}
static void
gtk_fill_layout_renderer_draw_error_underline (PangoRenderer *renderer,
int x,
int y,
int width,
int height)
{
GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
pango_cairo_show_error_underline (text_renderer->cr,
(double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
}
static void
gtk_fill_layout_renderer_draw_shape (PangoRenderer *renderer,
PangoAttrShape *attr,
int x,
int y)
{
GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
cairo_t *cr = text_renderer->cr;
PangoLayout *layout;
PangoCairoShapeRendererFunc shape_renderer;
gpointer shape_renderer_data;
layout = pango_renderer_get_layout (renderer);
if (!layout)
return;
shape_renderer = pango_cairo_context_get_shape_renderer (pango_layout_get_context (layout),
&shape_renderer_data);
if (!shape_renderer)
return;
cairo_save (cr);
cairo_move_to (cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
shape_renderer (cr, attr, FALSE, shape_renderer_data);
cairo_restore (cr);
}
static void
gtk_fill_layout_renderer_finalize (GObject *object)
{
G_OBJECT_CLASS (_gtk_fill_layout_renderer_parent_class)->finalize (object);
}
static void
_gtk_fill_layout_renderer_init (GtkFillLayoutRenderer *renderer)
{
}
static void
_gtk_fill_layout_renderer_class_init (GtkFillLayoutRendererClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
renderer_class->draw_glyphs = gtk_fill_layout_renderer_draw_glyphs;
renderer_class->draw_glyph_item = gtk_fill_layout_renderer_draw_glyph_item;
renderer_class->draw_rectangle = gtk_fill_layout_renderer_draw_rectangle;
renderer_class->draw_trapezoid = gtk_fill_layout_renderer_draw_trapezoid;
renderer_class->draw_error_underline = gtk_fill_layout_renderer_draw_error_underline;
renderer_class->draw_shape = gtk_fill_layout_renderer_draw_shape;
object_class->finalize = gtk_fill_layout_renderer_finalize;
}
void
_gtk_pango_fill_layout (cairo_t *cr,
PangoLayout *layout)
{
static GtkFillLayoutRenderer *renderer = NULL;
gboolean has_current_point;
double current_x, current_y;
has_current_point = cairo_has_current_point (cr);
cairo_get_current_point (cr, &current_x, &current_y);
if (renderer == NULL)
renderer = g_object_new (GTK_TYPE_FILL_LAYOUT_RENDERER, NULL);
cairo_save (cr);
cairo_translate (cr, current_x, current_y);
renderer->cr = cr;
pango_renderer_draw_layout (PANGO_RENDERER (renderer), layout, 0, 0);
cairo_restore (cr);
if (has_current_point)
cairo_move_to (cr, current_x, current_y);
}
static AtkAttributeSet *
add_attribute (AtkAttributeSet *attributes,
AtkTextAttribute attr,
const gchar *value)
{
AtkAttribute *at;
at = g_new (AtkAttribute, 1);
at->name = g_strdup (atk_text_attribute_get_name (attr));
at->value = g_strdup (value);
return g_slist_prepend (attributes, at);
}
/*
* _gtk_pango_get_default_attributes:
* @attributes: a #AtkAttributeSet to add the attributes to
* @layout: the #PangoLayout from which to get attributes
*
* Adds the default text attributes from @layout to @attributes,
* after translating them from Pango attributes to ATK attributes.
*
* This is a convenience function that can be used to implement
* support for the #AtkText interface in widgets using Pango
* layouts.
*
* Returns: the modified @attributes
*/
AtkAttributeSet*
_gtk_pango_get_default_attributes (AtkAttributeSet *attributes,
PangoLayout *layout)
{
PangoContext *context;
gint i;
PangoWrapMode mode;
context = pango_layout_get_context (layout);
if (context)
{
PangoLanguage *language;
PangoFontDescription *font;
language = pango_context_get_language (context);
if (language)
attributes = add_attribute (attributes, ATK_TEXT_ATTR_LANGUAGE,
pango_language_to_string (language));
font = pango_context_get_font_description (context);
if (font)
{
gchar buf[60];
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STYLE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STYLE,
pango_font_description_get_style (font)));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_VARIANT,
atk_text_attribute_get_value (ATK_TEXT_ATTR_VARIANT,
pango_font_description_get_variant (font)));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STRETCH,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STRETCH,
pango_font_description_get_stretch (font)));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_FAMILY_NAME,
pango_font_description_get_family (font));
g_snprintf (buf, 60, "%d", pango_font_description_get_weight (font));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_WEIGHT, buf);
g_snprintf (buf, 60, "%i", pango_font_description_get_size (font) / PANGO_SCALE);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_SIZE, buf);
}
}
if (pango_layout_get_justify (layout))
{
i = 3;
}
else
{
PangoAlignment align;
align = pango_layout_get_alignment (layout);
if (align == PANGO_ALIGN_LEFT)
i = 0;
else if (align == PANGO_ALIGN_CENTER)
i = 2;
else /* PANGO_ALIGN_RIGHT */
i = 1;
}
attributes = add_attribute (attributes, ATK_TEXT_ATTR_JUSTIFICATION,
atk_text_attribute_get_value (ATK_TEXT_ATTR_JUSTIFICATION, i));
mode = pango_layout_get_wrap (layout);
if (mode == PANGO_WRAP_WORD)
i = 2;
else /* PANGO_WRAP_CHAR */
i = 1;
attributes = add_attribute (attributes, ATK_TEXT_ATTR_WRAP_MODE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_WRAP_MODE, i));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STRIKETHROUGH,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STRIKETHROUGH, 0));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_UNDERLINE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_UNDERLINE, 0));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_RISE, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_SCALE, "1");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_BG_FULL_HEIGHT, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_PIXELS_INSIDE_WRAP, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_PIXELS_BELOW_LINES, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_PIXELS_ABOVE_LINES, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_EDITABLE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_EDITABLE, 0));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_INVISIBLE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_INVISIBLE, 0));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_INDENT, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_RIGHT_MARGIN, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_LEFT_MARGIN, "0");
return attributes;
}
/*
* _gtk_pango_get_run_attributes:
* @attributes: a #AtkAttributeSet to add attributes to
* @layout: the #PangoLayout to get the attributes from
* @offset: the offset at which the attributes are wanted
* @start_offset: return location for the starting offset
* of the current run
* @end_offset: return location for the ending offset of the
* current run
*
* Finds the 'run' around index (i.e. the maximal range of characters
* where the set of applicable attributes remains constant) and
* returns the starting and ending offsets for it.
*
* The attributes for the run are added to @attributes, after
* translating them from Pango attributes to ATK attributes.
*
* This is a convenience function that can be used to implement
* support for the #AtkText interface in widgets using Pango
* layouts.
*
* Returns: the modified #AtkAttributeSet
*/
AtkAttributeSet *
_gtk_pango_get_run_attributes (AtkAttributeSet *attributes,
PangoLayout *layout,
gint offset,
gint *start_offset,
gint *end_offset)
{
PangoAttrIterator *iter;
PangoAttrList *attr;
PangoAttrString *pango_string;
PangoAttrInt *pango_int;
PangoAttrColor *pango_color;
PangoAttrLanguage *pango_lang;
PangoAttrFloat *pango_float;
gint index, start_index, end_index;
gboolean is_next;
glong len;
const gchar *text;
gchar *value;
text = pango_layout_get_text (layout);
len = g_utf8_strlen (text, -1);
/* Grab the attributes of the PangoLayout, if any */
attr = pango_layout_get_attributes (layout);
if (attr == NULL)
{
*start_offset = 0;
*end_offset = len;
return attributes;
}
iter = pango_attr_list_get_iterator (attr);
/* Get invariant range offsets */
/* If offset out of range, set offset in range */
if (offset > len)
offset = len;
else if (offset < 0)
offset = 0;
index = g_utf8_offset_to_pointer (text, offset) - text;
pango_attr_iterator_range (iter, &start_index, &end_index);
is_next = TRUE;
while (is_next)
{
if (index >= start_index && index < end_index)
{
*start_offset = g_utf8_pointer_to_offset (text, text + start_index);
if (end_index == G_MAXINT) /* Last iterator */
end_index = len;
*end_offset = g_utf8_pointer_to_offset (text, text + end_index);
break;
}
is_next = pango_attr_iterator_next (iter);
pango_attr_iterator_range (iter, &start_index, &end_index);
}
/* Get attributes */
pango_string = (PangoAttrString*) pango_attr_iterator_get (iter, PANGO_ATTR_FAMILY);
if (pango_string != NULL)
{
value = g_strdup_printf ("%s", pango_string->value);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_FAMILY_NAME, value);
g_free (value);
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_STYLE);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STYLE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STYLE, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_WEIGHT);
if (pango_int != NULL)
{
value = g_strdup_printf ("%i", pango_int->value);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_WEIGHT, value);
g_free (value);
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_VARIANT);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_VARIANT,
atk_text_attribute_get_value (ATK_TEXT_ATTR_VARIANT, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_STRETCH);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STRETCH,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STRETCH, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_SIZE);
if (pango_int != NULL)
{
value = g_strdup_printf ("%i", pango_int->value / PANGO_SCALE);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_SIZE, value);
g_free (value);
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_UNDERLINE);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_UNDERLINE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_UNDERLINE, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_STRIKETHROUGH);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STRIKETHROUGH,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STRIKETHROUGH, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_RISE);
if (pango_int != NULL)
{
value = g_strdup_printf ("%i", pango_int->value);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_RISE, value);
g_free (value);
}
pango_lang = (PangoAttrLanguage*) pango_attr_iterator_get (iter, PANGO_ATTR_LANGUAGE);
if (pango_lang != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_LANGUAGE,
pango_language_to_string (pango_lang->value));
}
pango_float = (PangoAttrFloat*) pango_attr_iterator_get (iter, PANGO_ATTR_SCALE);
if (pango_float != NULL)
{
value = g_strdup_printf ("%g", pango_float->value);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_SCALE, value);
g_free (value);
}
pango_color = (PangoAttrColor*) pango_attr_iterator_get (iter, PANGO_ATTR_FOREGROUND);
if (pango_color != NULL)
{
value = g_strdup_printf ("%u,%u,%u",
pango_color->color.red,
pango_color->color.green,
pango_color->color.blue);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_FG_COLOR, value);
g_free (value);
}
pango_color = (PangoAttrColor*) pango_attr_iterator_get (iter, PANGO_ATTR_BACKGROUND);
if (pango_color != NULL)
{
value = g_strdup_printf ("%u,%u,%u",
pango_color->color.red,
pango_color->color.green,
pango_color->color.blue);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_BG_COLOR, value);
g_free (value);
}
pango_attr_iterator_destroy (iter);
return attributes;
}
/*
* _gtk_pango_move_chars:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
* @count: the number of characters to move from @offset
*
* Returns the position that is @count characters from the
* given @offset. @count may be positive or negative.
*
* For the purpose of this function, characters are defined
* by what Pango considers cursor positions.
*
* Returns: the new position
*/
gint
_gtk_pango_move_chars (PangoLayout *layout,
gint offset,
gint count)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (count > 0 && offset < n_attrs - 1)
{
do
offset++;
while (offset < n_attrs - 1 && !attrs[offset].is_cursor_position);
count--;
}
while (count < 0 && offset > 0)
{
do
offset--;
while (offset > 0 && !attrs[offset].is_cursor_position);
count++;
}
return offset;
}
/*
* _gtk_pango_move_words:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
* @count: the number of words to move from @offset
*
* Returns the position that is @count words from the
* given @offset. @count may be positive or negative.
*
* If @count is positive, the returned position will
* be a word end, otherwise it will be a word start.
* See the Pango documentation for details on how
* word starts and ends are defined.
*
* Returns: the new position
*/
gint
_gtk_pango_move_words (PangoLayout *layout,
gint offset,
gint count)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (count > 0 && offset < n_attrs - 1)
{
do
offset++;
while (offset < n_attrs - 1 && !attrs[offset].is_word_end);
count--;
}
while (count < 0 && offset > 0)
{
do
offset--;
while (offset > 0 && !attrs[offset].is_word_start);
count++;
}
return offset;
}
/*
* _gtk_pango_move_sentences:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
* @count: the number of sentences to move from @offset
*
* Returns the position that is @count sentences from the
* given @offset. @count may be positive or negative.
*
* If @count is positive, the returned position will
* be a sentence end, otherwise it will be a sentence start.
* See the Pango documentation for details on how
* sentence starts and ends are defined.
*
* Returns: the new position
*/
gint
_gtk_pango_move_sentences (PangoLayout *layout,
gint offset,
gint count)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (count > 0 && offset < n_attrs - 1)
{
do
offset++;
while (offset < n_attrs - 1 && !attrs[offset].is_sentence_end);
count--;
}
while (count < 0 && offset > 0)
{
do
offset--;
while (offset > 0 && !attrs[offset].is_sentence_start);
count++;
}
return offset;
}
/*
* _gtk_pango_move_lines:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
* @count: the number of lines to move from @offset
*
* Returns the position that is @count lines from the
* given @offset. @count may be positive or negative.
*
* If @count is negative, the returned position will
* be the start of a line, else it will be the end of
* line.
*
* Returns: the new position
*/
gint
_gtk_pango_move_lines (PangoLayout *layout,
gint offset,
gint count)
{
GSList *lines, *l;
PangoLayoutLine *line;
gint num;
const gchar *text;
gint pos, line_pos;
gint index;
gint len;
text = pango_layout_get_text (layout);
index = g_utf8_offset_to_pointer (text, offset) - text;
lines = pango_layout_get_lines (layout);
line = NULL;
num = 0;
for (l = lines; l; l = l->next)
{
line = l->data;
if (index < line->start_index + line->length)
break;
num++;
}
if (count < 0)
{
num += count;
if (num < 0)
num = 0;
line = g_slist_nth_data (lines, num);
return g_utf8_pointer_to_offset (text, text + line->start_index);
}
else
{
line_pos = index - line->start_index;
len = g_slist_length (lines);
num += count;
if (num >= len || (count == 0 && num == len - 1))
return g_utf8_strlen (text, -1) - 1;
line = l->data;
pos = line->start_index + line_pos;
if (pos >= line->start_index + line->length)
pos = line->start_index + line->length - 1;
return g_utf8_pointer_to_offset (text, text + pos);
}
}
/*
* _gtk_pango_is_inside_word:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
*
* Returns whether the given position is inside
* a word.
*
* Returns: %TRUE if @offset is inside a word
*/
gboolean
_gtk_pango_is_inside_word (PangoLayout *layout,
gint offset)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (offset >= 0 &&
!(attrs[offset].is_word_start || attrs[offset].is_word_end))
offset--;
if (offset >= 0)
return attrs[offset].is_word_start;
return FALSE;
}
/*
* _gtk_pango_is_inside_sentence:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
*
* Returns whether the given position is inside
* a sentence.
*
* Returns: %TRUE if @offset is inside a sentence
*/
gboolean
_gtk_pango_is_inside_sentence (PangoLayout *layout,
gint offset)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (offset >= 0 &&
!(attrs[offset].is_sentence_start || attrs[offset].is_sentence_end))
offset--;
if (offset >= 0)
return attrs[offset].is_sentence_start;
return FALSE;
}
static void
pango_layout_get_line_before (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
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 */
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;
else
start_index = 0;
end_index = prev_line->start_index + prev_line->length;
break;
default:
g_assert_not_reached();
}
}
else
start_index = end_index = 0;
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);
}
static void
pango_layout_get_line_at (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
PangoLayoutIter *iter;
PangoLayoutLine *line, *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 (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();
}
found = TRUE;
break;
}
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);
}
static void
pango_layout_get_line_after (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
PangoLayoutIter *iter;
PangoLayoutLine *line, *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 */
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;
found = TRUE;
break;
}
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_pango_get_text_before:
* @layout: a #PangoLayout
* @boundary_type: a #AtkTextBoundary
* @offset: a character offset in @layout
* @start_offset: return location for the start of the returned text
* @end_offset: return location for the end of the return text
*
* Gets a slice of the text from @layout before @offset.
*
* The @boundary_type determines the size of the returned slice of
* text. For the exact semantics of this function, see
* atk_text_get_text_before_offset().
*
* Returns: a newly allocated string containing a slice of text
* from layout. Free with g_free().
*/
gchar *
_gtk_pango_get_text_before (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
const gchar *text;
gint start, end;
const PangoLogAttr *attrs;
gint n_attrs;
text = pango_layout_get_text (layout);
if (text[0] == 0)
{
*start_offset = 0;
*end_offset = 0;
return g_strdup ("");
}
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
start = offset;
end = start;
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_CHAR:
start = _gtk_pango_move_chars (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_WORD_START:
if (!attrs[start].is_word_start)
start = _gtk_pango_move_words (layout, start, -1);
end = start;
start = _gtk_pango_move_words (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_WORD_END:
if (_gtk_pango_is_inside_word (layout, start) &&
!attrs[start].is_word_start)
start = _gtk_pango_move_words (layout, start, -1);
while (!attrs[start].is_word_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
end = start;
start = _gtk_pango_move_words (layout, start, -1);
while (!attrs[start].is_word_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_START:
if (!attrs[start].is_sentence_start)
start = _gtk_pango_move_sentences (layout, start, -1);
end = start;
start = _gtk_pango_move_sentences (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_END:
if (_gtk_pango_is_inside_sentence (layout, start) &&
!attrs[start].is_sentence_start)
start = _gtk_pango_move_sentences (layout, start, -1);
while (!attrs[start].is_sentence_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
end = start;
start = _gtk_pango_move_sentences (layout, start, -1);
while (!attrs[start].is_sentence_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_LINE_START:
case ATK_TEXT_BOUNDARY_LINE_END:
pango_layout_get_line_before (layout, boundary_type, offset, &start, &end);
break;
}
*start_offset = start;
*end_offset = end;
g_assert (start <= end);
return g_utf8_substring (text, start, end);
}
/*
* _gtk_pango_get_text_after:
* @layout: a #PangoLayout
* @boundary_type: a #AtkTextBoundary
* @offset: a character offset in @layout
* @start_offset: return location for the start of the returned text
* @end_offset: return location for the end of the return text
*
* Gets a slice of the text from @layout after @offset.
*
* The @boundary_type determines the size of the returned slice of
* text. For the exact semantics of this function, see
* atk_text_get_text_after_offset().
*
* Returns: a newly allocated string containing a slice of text
* from layout. Free with g_free().
*/
gchar *
_gtk_pango_get_text_after (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
const gchar *text;
gint start, end;
const PangoLogAttr *attrs;
gint n_attrs;
text = pango_layout_get_text (layout);
if (text[0] == 0)
{
*start_offset = 0;
*end_offset = 0;
return g_strdup ("");
}
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
start = offset;
end = start;
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_CHAR:
start = _gtk_pango_move_chars (layout, start, 1);
end = start;
end = _gtk_pango_move_chars (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_WORD_START:
if (_gtk_pango_is_inside_word (layout, end))
end = _gtk_pango_move_words (layout, end, 1);
while (!attrs[end].is_word_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
start = end;
if (end < n_attrs - 1)
{
end = _gtk_pango_move_words (layout, end, 1);
while (!attrs[end].is_word_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
}
break;
case ATK_TEXT_BOUNDARY_WORD_END:
end = _gtk_pango_move_words (layout, end, 1);
start = end;
if (end < n_attrs - 1)
end = _gtk_pango_move_words (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_START:
if (_gtk_pango_is_inside_sentence (layout, end))
end = _gtk_pango_move_sentences (layout, end, 1);
while (!attrs[end].is_sentence_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
start = end;
if (end < n_attrs - 1)
{
end = _gtk_pango_move_sentences (layout, end, 1);
while (!attrs[end].is_sentence_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
}
break;
case ATK_TEXT_BOUNDARY_SENTENCE_END:
end = _gtk_pango_move_sentences (layout, end, 1);
start = end;
if (end < n_attrs - 1)
end = _gtk_pango_move_sentences (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_LINE_START:
case ATK_TEXT_BOUNDARY_LINE_END:
pango_layout_get_line_after (layout, boundary_type, offset, &start, &end);
break;
}
*start_offset = start;
*end_offset = end;
g_assert (start <= end);
return g_utf8_substring (text, start, end);
}
/*
* _gtk_pango_get_text_at:
* @layout: a #PangoLayout
* @boundary_type: a #AtkTextBoundary
* @offset: a character offset in @layout
* @start_offset: return location for the start of the returned text
* @end_offset: return location for the end of the return text
*
* Gets a slice of the text from @layout at @offset.
*
* The @boundary_type determines the size of the returned slice of
* text. For the exact semantics of this function, see
* atk_text_get_text_after_offset().
*
* Returns: a newly allocated string containing a slice of text
* from layout. Free with g_free().
*/
gchar *
_gtk_pango_get_text_at (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
const gchar *text;
gint start, end;
const PangoLogAttr *attrs;
gint n_attrs;
text = pango_layout_get_text (layout);
if (text[0] == 0)
{
*start_offset = 0;
*end_offset = 0;
return g_strdup ("");
}
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
start = offset;
end = start;
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_CHAR:
end = _gtk_pango_move_chars (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_WORD_START:
if (!attrs[start].is_word_start)
start = _gtk_pango_move_words (layout, start, -1);
if (_gtk_pango_is_inside_word (layout, end))
end = _gtk_pango_move_words (layout, end, 1);
while (!attrs[end].is_word_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_WORD_END:
if (_gtk_pango_is_inside_word (layout, start) &&
!attrs[start].is_word_start)
start = _gtk_pango_move_words (layout, start, -1);
while (!attrs[start].is_word_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
end = _gtk_pango_move_words (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_START:
if (!attrs[start].is_sentence_start)
start = _gtk_pango_move_sentences (layout, start, -1);
if (_gtk_pango_is_inside_sentence (layout, end))
end = _gtk_pango_move_sentences (layout, end, 1);
while (!attrs[end].is_sentence_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_END:
if (_gtk_pango_is_inside_sentence (layout, start) &&
!attrs[start].is_sentence_start)
start = _gtk_pango_move_sentences (layout, start, -1);
while (!attrs[start].is_sentence_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
end = _gtk_pango_move_sentences (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_LINE_START:
case ATK_TEXT_BOUNDARY_LINE_END:
pango_layout_get_line_at (layout, boundary_type, offset, &start, &end);
break;
}
*start_offset = start;
*end_offset = end;
g_assert (start <= end);
return g_utf8_substring (text, start, end);
}
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