// Copyright 2014 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_FONT_LIST_IMPL_H_ #define UI_GFX_FONT_LIST_IMPL_H_ #include #include #include "base/memory/ref_counted.h" #include "ui/gfx/font.h" namespace gfx { // FontListImpl is designed to provide the implementation of FontList and // intended to be used only from FontList. You must not use this class // directly. // // FontListImpl represents a list of fonts either in the form of Font vector or // in the form of a string representing font names, styles, and size. // // FontListImpl could be initialized either way without conversion to the other // form. The conversion to the other form is done only when asked to get the // other form. // // For the format of font description string, see font_list.h for details. class FontListImpl : public base::RefCounted { public: // Creates a font list from a string representing font names, styles, and // size. explicit FontListImpl(const std::string& font_description_string); // Creates a font list from font names, styles, size and weight. FontListImpl(const std::vector& font_names, int font_style, int font_size, Font::Weight font_weight); // Creates a font list from a Font vector. // All fonts in this vector should have the same style and size. explicit FontListImpl(const std::vector& fonts); // Creates a font list from a Font. explicit FontListImpl(const Font& font); // Returns a new FontListImpl with the same font names but resized and the // given style and weight. |size_delta| is the size in pixels to add to the // current font size. |font_style| specifies the new style, which is a // bitmask of the values: Font::ITALIC and Font::UNDERLINE. FontListImpl* Derive(int size_delta, int font_style, Font::Weight weight) const; // Returns the height of this font list, which is max(ascent) + max(descent) // for all the fonts in the font list. int GetHeight() const; // Returns the baseline of this font list, which is max(baseline) for all the // fonts in the font list. int GetBaseline() const; // Returns the cap height of this font list. // Currently returns the cap height of the primary font. int GetCapHeight() const; // Returns the expected number of horizontal pixels needed to display the // specified length of characters. Call GetStringWidth() to retrieve the // actual number. int GetExpectedTextWidth(int length) const; // Returns the |Font::FontStyle| style flags for this font list. int GetFontStyle() const; // Returns the font size in pixels. int GetFontSize() const; // Returns the font weight. Font::Weight GetFontWeight() const; // Returns the Font vector. const std::vector& GetFonts() const; // Returns the first font in the list. const Font& GetPrimaryFont() const; private: friend class base::RefCounted; ~FontListImpl(); // Extracts common font height and baseline into |common_height_| and // |common_baseline_|. void CacheCommonFontHeightAndBaseline() const; // Extracts font style and size into |font_style_| and |font_size_|. void CacheFontStyleAndSize() const; // A vector of Font. If FontListImpl is constructed with font description // string, |fonts_| is not initialized during construction. Instead, it is // computed lazily when user asked to get the font vector. mutable std::vector fonts_; // A string representing font names, styles, and sizes. // Please refer to the comments before class declaration for details on string // format. // If FontListImpl is constructed with a vector of font, // |font_description_string_| is not initialized during construction. Instead, // it is computed lazily when user asked to get the font description string. // // TODO(derat): Remove laziness so that this can be removed. mutable std::string font_description_string_; // The cached common height and baseline of the fonts in the font list. mutable int common_height_; mutable int common_baseline_; // Cached font style and size. mutable int font_style_; mutable int font_size_; mutable Font::Weight font_weight_; }; } // namespace gfx #endif // UI_GFX_FONT_LIST_IMPL_H_