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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "ui/base/ime/composition_text_util_pango.h" | |
| 6 | |
| 7 #include <pango/pango-attributes.h> | |
| 8 | |
| 9 #include "base/basictypes.h" | |
| 10 #include "base/i18n/char_iterator.h" | |
| 11 #include "base/strings/string16.h" | |
| 12 #include "base/strings/utf_string_conversions.h" | |
| 13 #include "ui/base/ime/composition_text.h" | |
| 14 | |
| 15 namespace ui { | |
| 16 | |
| 17 void ExtractCompositionTextFromGtkPreedit(const gchar* utf8_text, | |
| 18 PangoAttrList* attrs, | |
| 19 int cursor_position, | |
| 20 CompositionText* composition) { | |
| 21 composition->Clear(); | |
| 22 composition->text = base::UTF8ToUTF16(utf8_text); | |
| 23 | |
| 24 if (composition->text.empty()) | |
| 25 return; | |
| 26 | |
| 27 // Gtk/Pango uses character index for cursor position and byte index for | |
| 28 // attribute range, but we use char16 offset for them. So we need to do | |
| 29 // conversion here. | |
| 30 std::vector<size_t> char16_offsets; | |
| 31 size_t length = composition->text.length(); | |
| 32 base::i18n::UTF16CharIterator char_iterator(&composition->text); | |
| 33 do { | |
| 34 char16_offsets.push_back(char_iterator.array_pos()); | |
| 35 } while (char_iterator.Advance()); | |
| 36 | |
| 37 // The text length in Unicode characters. | |
| 38 int char_length = static_cast<int>(char16_offsets.size()); | |
| 39 // Make sure we can convert the value of |char_length| as well. | |
| 40 char16_offsets.push_back(length); | |
| 41 | |
| 42 size_t cursor_offset = | |
| 43 char16_offsets[std::max(0, std::min(char_length, cursor_position))]; | |
| 44 | |
| 45 composition->selection = gfx::Range(cursor_offset); | |
| 46 | |
| 47 if (attrs) { | |
| 48 int utf8_length = strlen(utf8_text); | |
| 49 PangoAttrIterator* iter = pango_attr_list_get_iterator(attrs); | |
| 50 | |
| 51 // We only care about underline and background attributes and convert | |
| 52 // background attribute into selection if possible. | |
| 53 do { | |
| 54 gint start, end; | |
| 55 pango_attr_iterator_range(iter, &start, &end); | |
| 56 | |
| 57 start = std::min(start, utf8_length); | |
| 58 end = std::min(end, utf8_length); | |
| 59 if (start >= end) | |
| 60 continue; | |
| 61 | |
| 62 start = g_utf8_pointer_to_offset(utf8_text, utf8_text + start); | |
| 63 end = g_utf8_pointer_to_offset(utf8_text, utf8_text + end); | |
| 64 | |
| 65 // Double check, in case |utf8_text| is not a valid utf-8 string. | |
| 66 start = std::min(start, char_length); | |
| 67 end = std::min(end, char_length); | |
| 68 if (start >= end) | |
| 69 continue; | |
| 70 | |
| 71 PangoAttribute* background_attr = | |
| 72 pango_attr_iterator_get(iter, PANGO_ATTR_BACKGROUND); | |
| 73 PangoAttribute* underline_attr = | |
| 74 pango_attr_iterator_get(iter, PANGO_ATTR_UNDERLINE); | |
| 75 | |
| 76 if (background_attr || underline_attr) { | |
| 77 // Use a black thin underline by default. | |
| 78 CompositionUnderline underline(char16_offsets[start], | |
| 79 char16_offsets[end], | |
| 80 SK_ColorBLACK, | |
| 81 false, | |
| 82 SK_ColorTRANSPARENT); | |
| 83 | |
| 84 // Always use thick underline for a range with background color, which | |
| 85 // is usually the selection range. | |
| 86 if (background_attr) { | |
| 87 underline.thick = true; | |
| 88 // If the cursor is at start or end of this underline, then we treat | |
| 89 // it as the selection range as well, but make sure to set the cursor | |
| 90 // position to the selection end. | |
| 91 if (underline.start_offset == cursor_offset) { | |
| 92 composition->selection.set_start(underline.end_offset); | |
| 93 composition->selection.set_end(cursor_offset); | |
| 94 } else if (underline.end_offset == cursor_offset) { | |
| 95 composition->selection.set_start(underline.start_offset); | |
| 96 composition->selection.set_end(cursor_offset); | |
| 97 } | |
| 98 } | |
| 99 if (underline_attr) { | |
| 100 int type = reinterpret_cast<PangoAttrInt*>(underline_attr)->value; | |
| 101 if (type == PANGO_UNDERLINE_DOUBLE) | |
| 102 underline.thick = true; | |
| 103 else if (type == PANGO_UNDERLINE_ERROR) | |
| 104 underline.color = SK_ColorRED; | |
| 105 } | |
| 106 composition->underlines.push_back(underline); | |
| 107 } | |
| 108 } while (pango_attr_iterator_next(iter)); | |
| 109 pango_attr_iterator_destroy(iter); | |
| 110 } | |
| 111 | |
| 112 // Use a black thin underline by default. | |
| 113 if (composition->underlines.empty()) { | |
| 114 composition->underlines.push_back(CompositionUnderline( | |
| 115 0, length, SK_ColorBLACK, false, SK_ColorTRANSPARENT)); | |
| 116 } | |
| 117 } | |
| 118 | |
| 119 } // namespace ui | |
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