text_constants.h | Explore in Territory

// Copyright 2012 The Chromium Authors
// 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 { … };

// Specifies the selection behavior for a move/move-and-select command. For
// example consider the state "ab|cd|e", i.e. cd is selected. Assume the
// selection direction is from left to right. If we move to the beginning of the
// line (LINE_BREAK, CURSOR_LEFT), the resultant state is:
// "|ab|cde" for SELECTION_RETAIN, selection direction from right to left.
// "|abcd|e" for SELECTION_EXTEND, selection direction from right to left.
// "ab|cde" for SELECTION_CARET.
// "|abcde" for SELECTION_NONE.
enum SelectionBehavior { … };

// 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 { … };

// Horizontal text alignment modes.
enum HorizontalAlignment { … };

// Vertical text alignment modes for multiline text.
enum VerticalAlignment { … };

// The directionality modes used to determine the base text direction.
enum DirectionalityMode { … };

// Text styles and adornments.
// TODO(msw): Merge with gfx::Font::FontStyle.
enum TextStyle { … };

// Text baseline offset types.
// Figure of font metrics:
//   +--------+--------+------------------------+-------------+
//   |        |        | internal leading       | SUPERSCRIPT |
//   |        |        +------------+-----------|             |
//   |        | ascent |            | SUPERIOR  |-------------+
//   | height |        | cap height |-----------|
//   |        |        |            | INFERIOR  |-------------+
//   |        |--------+------------+-----------|             |
//   |        | descent                         | SUBSCRIPT   |
//   +--------+---------------------------------+-------------+
enum class BaselineStyle { … };

// Elision behaviors of text that exceeds constrained dimensions.
enum ElideBehavior { … };

}  // namespace gfx

#endif  // UI_GFX_TEXT_CONSTANTS_H_
chromium/ui/gfx/text_constants.h
