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 * adjusted to the actual pixel position.
76 pos_type x2pos(double &x) const;
78 // Returns the position on left side of the element.
79 pos_type left_pos() const;
80 // Returns the position on right side of the element.
81 pos_type right_pos() const;
83 // The kind of row element
85 // position of the element in the paragraph
87 // first position after the element in the paragraph
89 // The dimension of the chunk (does not contains the
90 // separator correction)
93 // Non-zero only if element is an inset
96 // Only non-null for separator elements
99 // Non-empty if element is a string or separator
105 // is it possible to add contents to this element?
108 friend std::ostream & operator<<(std::ostream & os, Element const & row);
115 bool changed() const { return changed_; }
117 void setChanged(bool c) { changed_ = c; }
119 void setCrc(size_type crc) const;
120 /// Set the selection begin and end.
122 * This is const because we update the selection status only at draw()
125 void setSelection(pos_type sel_beg, pos_type sel_end) const;
127 bool selection() const;
128 /// Set the selection begin and end and whether the left and/or right
129 /// margins are selected.
130 void setSelectionAndMargins(DocIterator const & beg,
131 DocIterator const & end) const;
134 void pos(pos_type p) { pos_ = p; }
136 pos_type pos() const { return pos_; }
138 void endpos(pos_type p) { end_ = p; }
140 pos_type endpos() const { return end_; }
142 void right_boundary(bool b) { right_boundary_ = b; }
144 bool right_boundary() const { return right_boundary_; }
147 Dimension const & dimension() const { return dim_; }
149 Dimension & dimension() { return dim_; }
151 int height() const { return dim_.height(); }
153 int width() const { return dim_.wid; }
155 int ascent() const { return dim_.asc; }
157 int descent() const { return dim_.des; }
160 void add(pos_type pos, Inset const * ins, Dimension const & dim,
161 Font const & f, Change const & ch);
163 void add(pos_type pos, char_type const c,
164 Font const & f, Change const & ch);
166 void addVirtual(pos_type pos, docstring const & s,
167 Font const & f, Change const & ch);
169 void addSeparator(pos_type pos, char_type const c,
170 Font const & f, Change const & ch);
172 void addSpace(pos_type pos, int width, Font const & f, Change const & ch);
175 typedef std::vector<Element> Elements;
177 typedef Elements::iterator iterator;
179 typedef Elements::const_iterator const_iterator;
181 iterator begin() { return elements_.begin(); }
183 iterator end() { return elements_.end(); }
185 const_iterator begin() const { return elements_.begin(); }
187 const_iterator end() const { return elements_.end(); }
190 bool empty() const { return elements_.empty(); }
192 Element & front() { return elements_.front(); }
194 Element const & front() const { return elements_.front(); }
196 Element & back() { return elements_.back(); }
198 Element const & back() const { return elements_.back(); }
199 /// remove last element
201 /// remove all row elements
202 void clear() { elements_.clear(); }
204 * if row width is too large, remove all elements after last
205 * separator and update endpos if necessary. If all that
206 * remains is a large word, cut it to \param width.
207 * \param body_pos minimum amount of text to keep.
208 * \param width maximum width of the row
210 void shorten_if_needed(pos_type const body_pos, int const width);
213 * If last element of the row is a string, compute its width
219 * Find sequences of right-to-left elements and reverse them.
220 * This should be called once the row is completely built.
222 void reverseRTL(bool rtl_par);
224 friend std::ostream & operator<<(std::ostream & os, Row const & row);
226 /// width of a separator (i.e. space)
228 /// width of hfills in the label
230 /// the x position of the row (left margin)
232 /// the right margin of the row
235 mutable pos_type sel_beg;
237 mutable pos_type sel_end;
239 mutable bool begin_margin_sel;
241 mutable bool end_margin_sel;
244 /// Decides whether the margin is selected.
246 * \param margin_begin
250 bool isMarginSelected(bool left_margin, DocIterator const & beg,
251 DocIterator const & end) const;
254 * Returns true if a char or string with font \c f and change
255 * type \c ch can be added to the current last element of the
258 bool sameString(Font const & f, Change const & ch) const;
263 /// has the Row appearance changed since last drawing?
264 mutable bool changed_;
265 /// CRC of row contents.
266 mutable size_type crc_;
267 /// first pos covered by this row
269 /// one behind last pos covered by this row
271 // Is there is a boundary at the end of the row (display inset...)
272 bool right_boundary_;