Do not compute caret geometry when we are not ready to do so.

[lyx.git] / src / frontends / FontMetrics.h

diff --git a/src/frontends/FontMetrics.h b/src/frontends/FontMetrics.h
index 59de63088c17c7d7cacfd833105a3209329f4e9e..c02606c4384f3536c0759b13503bbc4413e30022 100644 (file)
--- a/src/frontends/FontMetrics.h
+++ b/src/frontends/FontMetrics.h
@@ -63,6 +63,17 @@ public:
        /// 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
@@ -77,6 +88,31 @@ public:
        virtual int width(docstring const & s) const = 0;
        /// FIXME ??
        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;
        /**
@@ -89,9 +125,10 @@ public:
                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;
@@ -106,6 +143,10 @@ public:
        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;
 };