diff options
Diffstat (limited to 'chromium/ui/gfx/font_list.h')
| -rw-r--r-- | chromium/ui/gfx/font_list.h | 97 |
1 files changed, 36 insertions, 61 deletions
diff --git a/chromium/ui/gfx/font_list.h b/chromium/ui/gfx/font_list.h index e37fd625a23..1ba8ad1aff9 100644 --- a/chromium/ui/gfx/font_list.h +++ b/chromium/ui/gfx/font_list.h @@ -8,35 +8,35 @@ #include <string> #include <vector> +#include "base/memory/ref_counted.h" #include "ui/gfx/font.h" #include "ui/gfx/gfx_export.h" namespace gfx { -// FontList 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. -// -// The string representation is in the form "FAMILY_LIST [STYLE_OPTIONS] SIZE", -// where FAMILY_LIST is a comma separated list of families terminated by a -// comma, STYLE_OPTIONS is a whitespace separated list of words where each word -// describes one of style, variant, weight, stretch, or gravity, and SIZE is -// a decimal number followed by "px" for absolute size. STYLE_OPTIONS may be -// absent. +class FontListImpl; + +// FontList represents a list of fonts and provides metrics which are common +// in the fonts. FontList is copyable and it's quite cheap to copy. // -// The string format complies with that of Pango detailed at +// The format of font description string complies with that of Pango detailed at // http://developer.gnome.org/pango/stable/pango-Fonts.html#pango-font-description-from-string -// -// FontList 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. -// -// FontList allows operator= since FontList is a data member type in RenderText, -// and operator= is used in RenderText::SetFontList(). +// The format is "<FONT_FAMILY_LIST>,[STYLES] <SIZE>" where +// FONT_FAMILY_LIST is a comma-separated list of font family names, +// STYLES is a space-separated list of style names ("Bold" and "Italic"), +// SIZE is a font size in pixel with the suffix "px". +// Here are examples of font description string: +// "Arial, Helvetica, Bold Italic 14px" +// "Arial, 14px" class GFX_EXPORT FontList { public: - // Creates a font list with a Font with default name and style. + // Creates a font list with default font names, size and style, which are + // specified by SetDefaultFontDescription(). FontList(); + // Creates a font list that is a clone of another font list. + FontList(const FontList& other); + // Creates a font list from a string representing font names, styles, and // size. explicit FontList(const std::string& font_description_string); @@ -55,6 +55,9 @@ class GFX_EXPORT FontList { ~FontList(); + // Copies the given font list into this object. + FontList& operator=(const FontList& other); + // Sets the description string for default FontList construction. If it's // empty, FontList will initialize using the default Font constructor. // @@ -65,23 +68,20 @@ class GFX_EXPORT FontList { // is changed. static void SetDefaultFontDescription(const std::string& font_description); - // Returns a new FontList with the given |font_style| flags. - FontList DeriveFontList(int font_style) const; - - // Returns a new FontList with the same font names and style but with the - // given font |size| in pixels. - FontList DeriveFontListWithSize(int size) const; - - // Returns a new FontList with the same font names and style but resized. - // |size_delta| is the size in pixels to add to the current font size. - FontList DeriveFontListWithSizeDelta(int size_delta) const; - // Returns a new FontList with the same font names but resized and the given // style. |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::BOLD, Font::ITALIC and Font::UNDERLINE. - FontList DeriveFontListWithSizeDeltaAndStyle(int size_delta, - int font_style) const; + FontList Derive(int size_delta, int font_style) const; + + // Returns a new FontList with the same font names and style but resized. + // |size_delta| is the size in pixels to add to the current font size. + FontList DeriveWithSizeDelta(int size_delta) const; + + // Returns a new FontList with the same font names and size but the given + // style. |font_style| specifies the new style, which is a bitmask of the + // values: Font::BOLD, Font::ITALIC and Font::UNDERLINE. + FontList DeriveWithStyle(int font_style) const; // Returns the height of this font list, which is max(ascent) + max(descent) // for all the fonts in the font list. @@ -95,9 +95,6 @@ class GFX_EXPORT FontList { // Currently returns the cap height of the primary font. int GetCapHeight() const; - // Returns the number of horizontal pixels needed to display |text|. - int GetStringWidth(const base::string16& text) const; - // Returns the expected number of horizontal pixels needed to display the // specified length of characters. Call GetStringWidth() to retrieve the // actual number. @@ -121,33 +118,11 @@ class GFX_EXPORT FontList { const Font& GetPrimaryFont() const; private: - // 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 FontList 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 FontList 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. - 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_; + explicit FontList(FontListImpl* impl); + + static const scoped_refptr<FontListImpl>& GetDefaultImpl(); + + scoped_refptr<FontListImpl> impl_; }; } // namespace gfx |