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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_TEXT_CONSTANTS_H_
#define UI_GFX_TEXT_CONSTANTS_H_
namespace gfx {
// TODO(msw): Distinguish between logical character stops and glyph stops?
// TODO(msw): Merge with base::i18n::BreakIterator::BreakType.
enum BreakType {
CHARACTER_BREAK = 0, // Stop cursor movement on neighboring characters.
WORD_BREAK, // Stop cursor movement on nearest word boundaries.
LINE_BREAK, // Stop cursor movement on line ends as shown on screen.
};
// Specifies the word wrapping behavior when a word would exceed the available
// display width. All words that are too wide will be put on a new line, and
// then:
enum WordWrapBehavior {
IGNORE_LONG_WORDS, // Overflowing word text is left on that line.
TRUNCATE_LONG_WORDS, // Overflowing word text is truncated.
ELIDE_LONG_WORDS, // Overflowing word text is elided at the ellipsis.
WRAP_LONG_WORDS, // Overflowing word text is wrapped over multiple lines.
};
// Horizontal text alignment modes.
enum HorizontalAlignment {
ALIGN_LEFT = 0, // Align the text's left edge with that of its display area.
ALIGN_CENTER, // Align the text's center with that of its display area.
ALIGN_RIGHT, // Align the text's right edge with that of its display area.
ALIGN_TO_HEAD, // Align the text to its first strong character's direction.
};
// The directionality modes used to determine the base text direction.
enum DirectionalityMode {
DIRECTIONALITY_FROM_TEXT = 0, // Use the first strong character's direction.
DIRECTIONALITY_FROM_UI, // Use the UI locale's text reading direction.
DIRECTIONALITY_FORCE_LTR, // Use LTR regardless of content or UI locale.
DIRECTIONALITY_FORCE_RTL, // Use RTL regardless of content or UI locale.
};
// Text styles and adornments.
// TODO(msw): Merge with gfx::Font::FontStyle.
enum TextStyle {
BOLD = 0,
ITALIC,
STRIKE,
DIAGONAL_STRIKE,
UNDERLINE,
NUM_TEXT_STYLES,
};
// Text baseline offset types.
// Figure of font metrics:
// +--------+--------+------------------------+-------------+
// | | | internal leading | SUPERSCRIPT |
// | | +------------+-----------| |
// | | ascent | | SUPERIOR |-------------+
// | height | | cap height |-----------|
// | | | | INFERIOR |-------------+
// | |--------+------------+-----------| |
// | | descent | SUBSCRIPT |
// +--------+---------------------------------+-------------+
enum BaselineStyle {
NORMAL_BASELINE = 0,
SUPERSCRIPT, // e.g. a mathematical exponent would be superscript.
SUPERIOR, // e.g. 8th, the "th" would be superior script.
INFERIOR, // e.g. 1/2, the "2" would be inferior ("1" is superior).
SUBSCRIPT, // e.g. H2O, the "2" would be subscript.
};
// Elision behaviors of text that exceeds constrained dimensions.
enum ElideBehavior {
NO_ELIDE = 0, // Do not modify the text, it may overflow its available bounds.
TRUNCATE, // Do not elide or fade, just truncate at the end of the string.
ELIDE_HEAD, // Add an ellipsis at the start of the string.
ELIDE_MIDDLE, // Add an ellipsis in the middle of the string.
ELIDE_TAIL, // Add an ellipsis at the end of the string.
ELIDE_EMAIL, // Add ellipses to username and domain substrings.
FADE_TAIL, // Fade the string's end opposite of its horizontal alignment.
};
} // namespace gfx
#endif // UI_GFX_TEXT_CONSTANTS_H_
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