#ifndef INKSCAPE_TEXT_TAG_ATTRIBUTES_H
#define INKSCAPE_TEXT_TAG_ATTRIBUTES_H
#include <vector>
#include <glib.h>
#include "libnrtype/Layout-TNG.h"
#include "svg/svg-length.h"
}
}
/** \brief contains and manages the attributes common to all types of text tag
The five attributes x, y, dx, dy and rotate (todo: textlength, lengthadjust)
are permitted on all of text, tspan and textpath elements so we need a class
to abstract the management of those attributes from the actual type of the
element.
*/
TextTagAttributes() {}
: attributes(attrs) {}
/// Fill in all the fields of #attributes from the given node.
/** Process the parameters from the set() function of SPObject.
Returns true if \a key was a recognised attribute. */
bool readSingleAttribute(unsigned key, gchar const *value, SPStyle const *style, Geom::Rect const *viewport);
/// Write out all the contents of #attributes to the given node.
/// Update relative values
/** For tspan role=line elements we should not use the set x,y
coordinates since that would overrule the values calculated by the
text layout engine, however if there are more than one element in
the x or y vectors we can presume that the user set them and hence
they should be copied. This function detects that condition so the
\a use_xy parameter to mergeInto() can be set correctly. */
bool singleXYCoordinates() const;
/** Returns false if all of the vectors are zero length. */
bool anyAttributesSet() const;
/** Implements the rules for overlaying the contents of the class
(treated as the child object) on top of previously existing
attributes from \a parent_attrs using the rules described in
SVG 1.1 section 10.5. \a parent_attrs_offset can be used to require
that only fields from \a parent_attrs starting at that index will
be used. Basically, the algorithm is that if a child attribute
exists that will be used, otherwise the parent attribute will be used,
otherwise the vector will end. textLength is never merged with parent. */
void mergeInto(Inkscape::Text::Layout::OptionalTextTagAttrs *output, Inkscape::Text::Layout::OptionalTextTagAttrs const &parent_attrs, unsigned parent_attrs_offset, bool copy_xy, bool copy_dxdyrotate) const;
/** Deletes all the values from all the vectors beginning at
\a start_index and extending for \a n fields. This is what you want
to do when deleting characters from the corresponding text. */
void erase(unsigned start_index, unsigned n);
/** Inserts \a n new values in all the stored vectors at \a
start_index. This is what you want to do when inserting characters
in the corresponding text. If a vector is shorter than \a start_index
it will not be extended (the defaults are fine). dx, dy and rotate
will be extended with zero values, x and y will be extended with
linearly interpolated values. TODO: The inserted values should probably
be unset but sp_svg_length_list_read() can't cope with that. */
void insert(unsigned start_index, unsigned n);
/** Divides the stored attributes into two, at the given index. The
first section (0..index-1) stay in this object, the second section
(index..end) go in \a second. This function is generally used when
line breaking. */
/** Overwrites all the attributes contained in this object with the
given parameters by putting \a first at the beginning, then the
contents of \a second after \a second_index. */
/** Applies the given transformation to the stored coordinates. Pairs
of x and y coordinates are multiplied by the matrix and the dx and dy
vectors are multiplied by the given parameters. rotate is not altered.
If \a extend_zero_length is true, then if the x or y vectors are empty
they will be made length 1 in order to store the newly calculated
position. */
void transform(Geom::Affine const &matrix, double scale_x, double scale_y, bool extend_zero_length = false);
/** Gets current value of dx vector at \a index. */
/** Gets current value of dy vector at \a index. */
/** Adds the given value to the dx vector at the given
\a index. The vector is extended if necessary. */
/** Adds the given value to the dy vector at the given
\a index. The vector is extended if necessary. */
/** Adds the given values to the dx and dy vectors at the given
\a index. The vectors are extended if necessary. */
/** Gets current value of rotate vector at \a index. */
/** Adds the given value to the rotate vector at the given \a index. The
vector is extended if necessary. Delta is measured in degrees, clockwise
positive. */
/** Sets rotate vector at the given \a index. The vector is extended if
necessary. Angle is measured in degrees, clockwise positive. */
/** Returns the first coordinates in the x and y vectors. If either
is zero length, 0.0 is used for that coordinate. */
/** Sets the first coordinates in the x and y vectors. */
/// This holds the actual values.
/** Does the reverse of readSingleAttribute(), converting a vector<> to
its SVG string representation and writing it in to \a node. Used by
writeTo(). */
static void writeSingleAttributeVector(Inkscape::XML::Node *node, gchar const *key, std::vector<SVGLength> const &attr_vector);
/** Writes a single length value to \a node. Used by
writeTo(). */
static void writeSingleAttributeLength(Inkscape::XML::Node *node, gchar const *key, const SVGLength &length);
/** Does mergeInto() for one member of #attributes. If \a overlay_list
is NULL then it does a simple copy of parent elements, starting at
\a parent_offset. */
static void mergeSingleAttribute(std::vector<SVGLength> *output_list, std::vector<SVGLength> const &parent_list, unsigned parent_offset, std::vector<SVGLength> const *overlay_list = NULL);
/// Does the work for erase().
static void eraseSingleAttribute(std::vector<SVGLength> *attr_vector, unsigned start_index, unsigned n);
/// Does the work for insert().
static void insertSingleAttribute(std::vector<SVGLength> *attr_vector, unsigned start_index, unsigned n, bool is_xy);
/// Does the work for split().
static void splitSingleAttribute(std::vector<SVGLength> *first_vector, unsigned index, std::vector<SVGLength> *second_vector, bool trimZeros);
/// Does the work for join().
static void joinSingleAttribute(std::vector<SVGLength> *dest_vector, std::vector<SVGLength> const &first_vector, std::vector<SVGLength> const &second_vector, unsigned second_index);
};
#endif /* !INKSCAPE_TEXT_TAG_ATTRIBUTES_H */
/*
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*/
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