/// return default dimension of the font.
/// \warning \c width is set to zero.
virtual Dimension const defaultDimension() const = 0;
+ /// return the em size
+ virtual int em() const = 0;
+ /// return the x height
+ virtual int xHeight() const = 0;
+ /// return the width of a line for underlining
+ virtual int lineWidth() const = 0;
+ /// return the distance from the base line to where an underline
+ /// should be drawn.
+ virtual int underlinePos() const = 0;
+ /// return the distance from the base line to where the strike out line
+ /// should be drawn.
+ virtual int strikeoutPos() const = 0;
+
/// return the width of the char in the font
virtual int width(char_type c) const = 0;
/// return the ascent of the char in the font
* return the x offset of a position in the string. The
* direction of the string is forced, and the returned value
* is from the left edge of the word, not from the start of the string.
+ * \param rtl is true for right-to-left layout
+ * \param ws is the amount of extra inter-word space applied text justication.
*/
- virtual int pos2x(docstring const & s, int pos, bool rtl) const = 0;
+ virtual int pos2x(docstring const & s, int pos, bool rtl, double ws) const = 0;
/**
* return the position in the string for a given x offset. The
* direction of the string is forced, and the returned value
* is from the left edge of the word, not from the start of the string.
* the offset x is updated to match the closest position in the string.
+ * \param rtl is true for right-to-left layout
+ * \param ws is the amount of extra inter-word space applied text justication.
+ */
+ virtual int x2pos(docstring const & s, int & x, bool rtl, double ws) const = 0;
+ /**
+ * Break string at width at most x.
+ * \return true if successful
+ * \param rtl is true for right-to-left layout
+ * \param force is false for breaking at word separator, true for
+ * arbitrary position.
*/
- virtual int x2pos(docstring const & s, int & x, bool rtl) const = 0;
+ virtual bool breakAt(docstring & s, int & x, bool rtl, bool force) const = 0;
/// return char dimension for the font.
virtual Dimension const dimension(char_type c) const = 0;
/**
int & descent) const = 0;
/**
* fill in width,ascent,descent with the values for the
- * given string in the font for a button.
+ * given string in the font for a button with given offset.
*/
virtual void buttonText(docstring const & str,
+ const int offset,
int & width,
int & ascent,
int & descent) const = 0;
inline int center(char_type c) const {
return (rbearing(c) - lbearing(c)) / 2;
}
+
+ /// return the number of expanding characters taken into account for
+ /// increased inter-word spacing during justification
+ virtual int countExpanders(docstring const & str) const = 0;
};