X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=src%2Ffrontends%2FFontMetrics.h;h=8358e2eb1eadbf70204c7a3443006c4a828d3319;hb=1f10969bb5c5f36017bf5ba8671381b09945cf57;hp=16dbf00f70a31b1fab966c4dcf45a82fbf4e0869;hpb=28ad9602557a145bfd88c79dddecdc34c95c698c;p=lyx.git

diff --git a/src/frontends/FontMetrics.h b/src/frontends/FontMetrics.h
index 16dbf00f70..8358e2eb1e 100644
--- a/src/frontends/FontMetrics.h
+++ b/src/frontends/FontMetrics.h
@@ -14,7 +14,7 @@
 #ifndef FONT_METRICS_H
 #define FONT_METRICS_H
 
-#include "support/docstring.h"
+#include "support/strfwd.h"
 
 /**
  * A class holding helper functions for determining
@@ -38,9 +38,17 @@
  *               <-  width ->
  * --------------+----------+-------<maxDescent
  *
+ * Caution: All char_type and docstring arguments of any method of this class
+ * are no UCS4 chars or strings if the font is a symbol font. They simply
+ * denote the code points of the font instead. You have to keep this in mind
+ * when you implement the methods in a frontend. You must not pass these
+ * parameters to a unicode conversion function in particular.
  */
 
 namespace lyx {
+
+class Dimension;
+
 namespace frontend {
 
 class FontMetrics
@@ -52,23 +60,66 @@ public:
 	virtual int maxAscent() const = 0;
 	/// return the maximum descent of the font
 	virtual int maxDescent() const = 0;
+	/// 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 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
-	virtual int ascent(lyx::char_type c) const = 0;
+	virtual int ascent(char_type c) const = 0;
 	/// return the descent of the char in the font
-	virtual int descent(lyx::char_type c) const = 0;
+	virtual int descent(char_type c) const = 0;
 	/// return the left bearing of the char in the font
-	virtual int lbearing(lyx::char_type c) const = 0;
+	virtual int lbearing(char_type c) const = 0;
 	/// return the right bearing of the char in the font
-	virtual int rbearing(lyx::char_type c) const = 0;
+	virtual int rbearing(char_type c) const = 0;
 	/// return the width of the string in the font
-	virtual int width(lyx::char_type const * s, size_t n) const = 0;
+	virtual int width(docstring const & s) const = 0;
 	/// FIXME ??
-	virtual int signedWidth(lyx::docstring const & s) const = 0;
+	virtual int signedWidth(docstring const & s) const = 0;
+	/**
+	 * 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, 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 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;
 	/**
 	 * fill in width,ascent,descent with the values for the
 	 * given string in the font.
 	 */
-	virtual void rectText(lyx::docstring const & str,
+	virtual void rectText(docstring const & str,
 		int & width,
 		int & ascent,
 		int & descent) const = 0;
@@ -76,46 +127,37 @@ public:
 	 * fill in width,ascent,descent with the values for the
 	 * given string in the font for a button.
 	 */
-	virtual void buttonText(lyx::docstring const & str,
+	virtual void buttonText(docstring const & str,
 		int & width,
 		int & ascent,
 		int & descent) const = 0;
 
 	/// return the maximum descent of the font
-	inline int maxHeight() const {
-		return maxAscent() + maxDescent();
-	}
+	inline int maxHeight() const { return maxAscent() + maxDescent(); }
 
 	/// return the descent of the char in the font
-	inline int height(lyx::char_type c) const
-	{
-		return ascent(c) + descent(c);
-	}
+	inline int height(char_type c) const { return ascent(c) + descent(c); }
 
 	/// return the inner width of the char in the font
-	inline int center(lyx::char_type c) const {
+	inline int center(char_type c) const {
 		return (rbearing(c) - lbearing(c)) / 2;
 	}
 
-	/// return the width of the char in the font
-	inline int width(lyx::char_type c) const
-	{
-		lyx::char_type tmp[2] = { c, L'\0'};
-		return width(tmp, 1);
-	}
-
-	/// return the width of the string in the font
-	inline int width(lyx::docstring const & s) const
-	{
-	    return s.empty() ? 0 : width(s.data(), s.length());
-	}
+	/// return the number of expanding characters taken into account for
+	/// increased inter-word spacing during justification
+	virtual int countExpanders(docstring const & str) const = 0;
 };
 
+
 } // namespace frontend
-} // namespace lyx
 
-class LyXFont;
+class Font;
+class FontInfo;
 
-extern lyx::frontend::FontMetrics const & theFontMetrics(LyXFont const & f);
+/// Implementation is in Application.cpp
+frontend::FontMetrics const & theFontMetrics(Font const & f);
+frontend::FontMetrics const & theFontMetrics(FontInfo const & fi);
+
+} // namespace lyx
 
 #endif // FONT_METRICS_H