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- // 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 <string>
- #include <vector>
- #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<FontListImpl> {
- 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<std::string>& 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<Font>& 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<Font>& GetFonts() const;
- // Returns the first font in the list.
- const Font& GetPrimaryFont() const;
- private:
- friend class base::RefCounted<FontListImpl>;
- ~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<Font> 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_
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