4 * This file is part of LyX, the document processor.
5 * Licence details can be found in the file COPYING.
7 * \author Matthias Ettrich
8 * \author Lars Gullik Bjønnes
10 * Full author contact details are available in file CREDITS.
12 * Metrics for an on-screen text row.
19 #include "Dimension.h"
22 #include "support/docstring.h"
23 #include "support/types.h"
33 * An on-screen row of text. A paragraph is broken into a RowList for
34 * display. Each Row contains a tokenized description of the contents
39 // Possible types of row elements
41 // a string of character
44 * Something (completion, end-of-par marker)
45 * that occupies space one screen but does not
46 * correspond to any paragraph contents
49 // A stretchable space, basically
53 // Some spacing described by its width, not a string
58 * One element of a Row. It has a set of attributes that can be used
59 * by other methods that need to parse the Row contents.
62 Element(Type const t, pos_type p, Font const & f, Change const & ch)
63 : type(t), pos(p), endpos(p + 1), inset(0),
64 extra(0), font(f), change(ch), final(false) {}
66 // returns total width of element, including separator overhead
67 double width() const { return dim.wid + extra; };
68 // returns position in pixels (from the left) of position
69 // \param i in the row element
70 double pos2x(pos_type const i) const;
72 /** Return character position that is the closest to
73 * pixel position \param x. The value \param x is
74 * rounded to the actual pixel position. If \param
75 * short is true, the pixel value is rounded by
78 pos_type x2pos(double &x, bool low = false) const;
80 // The kind of row element
82 // position of the element in the paragraph
84 // first position after the element in the paragraph
86 // The dimension of the chunk (does not contains the
87 // separator correction)
90 // Non-zero only if element is an inset
93 // Only non-null for separator elements
96 // Non-empty if element is a string or separator
102 // is it possible to add contents to this element?
105 friend std::ostream & operator<<(std::ostream & os, Element const & row);
112 bool changed() const { return changed_; }
114 void setChanged(bool c) { changed_ = c; }
116 void setCrc(size_type crc) const;
117 /// Set the selection begin and end.
119 * This is const because we update the selection status only at draw()
122 void setSelection(pos_type sel_beg, pos_type sel_end) const;
124 bool selection() const;
125 /// Set the selection begin and end and whether the left and/or right
126 /// margins are selected.
127 void setSelectionAndMargins(DocIterator const & beg,
128 DocIterator const & end) const;
131 void pos(pos_type p) { pos_ = p; }
133 pos_type pos() const { return pos_; }
135 void endpos(pos_type p) { end_ = p; }
137 pos_type endpos() const { return end_; }
139 void right_boundary(bool b) { right_boundary_ = b; }
141 bool right_boundary() const { return right_boundary_; }
144 Dimension const & dimension() const { return dim_; }
146 Dimension & dimension() { return dim_; }
148 int height() const { return dim_.height(); }
150 int width() const { return dim_.wid; }
152 int ascent() const { return dim_.asc; }
154 int descent() const { return dim_.des; }
157 void add(pos_type pos, Inset const * ins, Dimension const & dim,
158 Font const & f, Change const & ch);
160 void add(pos_type pos, char_type const c,
161 Font const & f, Change const & ch);
163 void addVirtual(pos_type pos, docstring const & s,
164 Font const & f, Change const & ch);
166 void addSeparator(pos_type pos, char_type const c,
167 Font const & f, Change const & ch);
169 void addSpace(pos_type pos, int width, Font const & f, Change const & ch);
172 typedef std::vector<Element> Elements;
174 typedef Elements::iterator iterator;
176 typedef Elements::const_iterator const_iterator;
178 iterator begin() { return elements_.begin(); }
180 iterator end() { return elements_.end(); }
182 const_iterator begin() const { return elements_.begin(); }
184 const_iterator end() const { return elements_.end(); }
187 bool empty() const { return elements_.empty(); }
189 Element & front() { return elements_.front(); }
191 Element const & front() const { return elements_.front(); }
193 Element & back() { return elements_.back(); }
195 Element const & back() const { return elements_.back(); }
196 /// remove last element
198 /// remove all row elements
199 void clear() { elements_.clear(); }
201 * if row width is too large, remove all elements after last
202 * separator and update endpos if necessary. If all that
203 * rename is a large word, cut it to \param width.
204 * \param body_pos minimum amount of text to keep.
205 * \param width maximum width of the row
207 void shorten_if_needed(pos_type const body_pos, int const width);
210 * If last element of the row is a string, compute its width
216 * Find sequences of right-to-left elements and reverse them.
217 * This should be called once the row is completely built.
219 void reverseRTL(bool rtl_par);
221 friend std::ostream & operator<<(std::ostream & os, Row const & row);
223 /// width of a separator (i.e. space)
225 /// width of hfills in the label
227 /// the x position of the row (left margin)
229 /// the right margin of the row
232 mutable pos_type sel_beg;
234 mutable pos_type sel_end;
236 mutable bool begin_margin_sel;
238 mutable bool end_margin_sel;
241 /// Decides whether the margin is selected.
243 * \param margin_begin
247 bool isMarginSelected(bool left_margin, DocIterator const & beg,
248 DocIterator const & end) const;
251 * Returns true if a char or string with font \c f and change
252 * type \c ch can be added to the current last element of the
255 bool sameString(Font const & f, Change const & ch) const;
260 /// has the Row appearance changed since last drawing?
261 mutable bool changed_;
262 /// CRC of row contents.
263 mutable size_type crc_;
264 /// first pos covered by this row
266 /// one behind last pos covered by this row
268 // Is there is a boundary at the end of the row (display inset...)
269 bool right_boundary_;