1 /* $Id: glyphstring.hg,v 1.2 2006/05/30 17:14:21 murrayc Exp $ */
5 * Copyright (C) 1998-1999 The gtkmm Development Team
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the Free
19 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <pangomm/font.h>
23 #include <pangomm/glyph.h>
24 #include <pangomm/item.h>
25 #include <cairomm/context.h>
26 #include <pango/pango-glyph.h>
27 #include <pango/pango-item.h> //For PangoAnalysis.
34 /** A Pango::GlyphString is used to store strings of glyphs with geometry and visual attribute information.
35 * It can be measured or drawn to the screen.
39 _CLASS_BOXEDTYPE(GlyphString, PangoGlyphString, pango_glyph_string_new, pango_glyph_string_copy, pango_glyph_string_free)
40 _IGNORE(pango_glyph_string_free, pango_glyph_string_copy, pango_glyph_string_copy_static, pango_glyph_string_equal)
41 _IGNORE(pango_glyph_string_index_to_x, pango_glyph_string_x_to_index, pango_glyph_string_get_logical_widths)
44 /** Construct a string of glyphs from a string of characters.
45 * Given a segment of text and the corresponding Pango::Analysis structure
46 * returned from Pango::Context::itemize(), convert the characters into glyphs.
47 * You may also pass in only a sub-string of the item.
48 * @param text The text to process. You must pass the same string into those member functions expecting a const Glib::ustring&.
49 * @param analysis The analysis information return from Pango::Context::itemize().
51 GlyphString(const Glib::ustring& text, const Analysis& analysis);
53 _WRAP_METHOD(void set_size (int new_len), pango_glyph_string_set_size)
55 _WRAP_METHOD(void get_extents(const Glib::RefPtr<const Font>& font, Rectangle& ink_rect, Rectangle& logical_rect) const, pango_glyph_string_extents)
56 _WRAP_METHOD(void get_extents(int start, int end, const Glib::RefPtr<const Font>& font, Rectangle& ink_rect, Rectangle& logical_rect) const, pango_glyph_string_extents_range)
58 _WRAP_METHOD(int get_width() const, pango_glyph_string_get_width)
60 /** Computes the extents of the glyph string as drawn.
61 * @param font A Pango::Font.
62 * @return The extents of the glyph string as drawn.
64 Rectangle get_ink_extents(const Glib::RefPtr<const Font>& font) const;
66 /** Computes the extents of a sub-portion of the glyph string as drawn.
67 * @param start The start index.
68 * @param end The end index.
69 * @param font A Panog::Font
70 * @return The extents of the sub-portion of the glyph string as drawn.
72 Rectangle get_ink_extents(int start, int end, const Glib::RefPtr<const Font>& font) const;
74 /** Computes the logical extents of a sub-portion of the glyph string.
75 * @param font A Pango::Font.
76 * @return The logical extents of the glyph string.
78 Rectangle get_logical_extents(const Glib::RefPtr<const Font>& font) const;
80 /** Computes the logical extents of a sub-portion of the glyph string.
81 * @param start The start index.
82 * @param end The end index.
83 * @param font A Pango::Font.
84 * @return The logical extents of the sub-portion of the glyph string.
86 Rectangle get_logical_extents(int start, int end, const Glib::RefPtr<const Font>& font) const;
88 /** Determine the screen width corresponding to each character.
89 * When multiple characters compose a single cluster, the width of the entire cluster
90 * is divided equally among the characters.
91 * @param text The text corresponding to the glyphs.
92 * @param embedding_level The embedding level of the string.
93 * @return An array of integers representing the resulting character widths.
95 Glib::ArrayHandle<int> get_logical_widths(const Glib::ustring& text, int embedding_level) const;
97 /** Converts from character position to x position.
98 * (X position is measured from the left edge of the run). Character positions are computed by dividing up each cluster into equal portions.
99 * @param text The text corresponding to the glyphs.
100 * @param analysis The analysis information return from Pango::Context::itemize().
101 * @param index The byte index within text.
102 * @param trailing Whether we should compute the result for the beginning or end of the character.
103 * @return The x position.
105 int index_to_x(const Glib::ustring& text, const Analysis& analysis, int index, bool trailing) const;
107 /** Convert from x offset to character position.
108 * Character positions are computed by dividing up each cluster into equal portions.
109 * In scripts where positioning within a cluster is not allowed (such as Thai),
110 * the returned value may not be a valid cursor position; the caller must combine the
111 * result with the logical attributes for the text to compute the valid cursor position.
112 * @param text The text corresponding to the glyphs.
113 * @param analysis The analysis information return from Pango::Context::itemize().
114 * @param x_pos The x offset (in thousands of a device unit).
115 * @param index The location to store calculated byte index within.
116 * @param trailing The location to store a boolean indicating whether the user clicked on the leading or trailing edge of the character.
118 void x_to_index(const Glib::ustring& text, const Analysis& analysis, int x_pos, int& index, bool& trailing) const;
120 /** Gharacter positions are computed by dividing up each cluster into equal portions.
121 * @return An array of Pango::GlyphInfo objects.
123 Glib::ArrayHandle<GlyphInfo> get_glyphs() const;
126 //void pango_cairo_glyph_string_path (cairo_t *cr,
128 // PangoGlyphString *glyphs);