4 * This file is part of LyX, the document processor.
5 * Licence details can be found in the file COPYING.
7 * \author Lars Gullik Bjønnes
9 * \author Abdelrazak Younes
11 * Full author contact details are available in file CREDITS.
14 #ifndef TEXT_METRICS_H
15 #define TEXT_METRICS_H
18 #include "ParagraphMetrics.h"
20 #include "support/types.h"
31 /// A map from a Text to the map of paragraphs metrics
35 /// Default constructor (only here for STL containers).
36 TextMetrics() : text_(0) {}
37 /// The only useful constructor.
38 TextMetrics(BufferView *, Text *);
41 bool has(pit_type pit) const;
43 ParagraphMetrics const & parMetrics(pit_type) const;
45 std::pair<pit_type, ParagraphMetrics const *> first() const;
47 std::pair<pit_type, ParagraphMetrics const *> last() const;
50 int parPosition(pit_type pit) const;
53 Dimension const & dimension() const { return dim_; }
55 Point const & origin() const { return origin_; }
58 /// compute text metrics.
59 bool metrics(MetricsInfo & mi, Dimension & dim, int min_width = 0);
62 void newParMetricsDown();
64 void newParMetricsUp();
66 /// Gets the fully instantiated font at a given position in a paragraph
67 /// Basically the same routine as Paragraph::getFont() in Paragraph.cpp.
68 /// The difference is that this one is used for displaying, and thus we
69 /// are allowed to make cosmetic improvements. For instance make footnotes
71 Font getDisplayFont(pit_type pit,
74 /// There are currently two font mechanisms in LyX:
75 /// 1. The font attributes in a lyxtext, and
76 /// 2. The inset-specific font properties, defined in an inset's
77 /// metrics() and draw() methods and handed down the inset chain through
78 /// the pi/mi parameters, and stored locally in a lyxtext in font_.
79 /// This is where the two are integrated in the final fully realized
81 void applyOuterFont(Font &) const;
83 /// is this position in the paragraph right-to-left?
84 bool isRTL(CursorSlice const & sl, bool boundary) const;
85 /// is between pos-1 and pos an RTL<->LTR boundary?
86 bool isRTLBoundary(pit_type pit,
88 /// would be a RTL<->LTR boundary between pos and the given font?
89 bool isRTLBoundary(pit_type pit,
90 pos_type pos, Font const & font) const;
93 /// Rebreaks the given paragraph.
94 /// \retval true if a full screen redraw is needed.
95 /// \retval false if a single paragraph redraw is enough.
96 bool redoParagraph(pit_type const pit);
97 /// Clear cache of paragraph metrics
98 void clear() { par_metrics_.clear(); }
101 int ascent() const { return dim_.asc; }
103 int descent() const { return dim_.des; }
104 /// current text width.
105 int width() const { return dim_.wid; }
106 /// current text heigth.
107 int height() const { return dim_.height(); }
110 int maxWidth() const { return max_width_; }
112 int singleWidth(pit_type const pit, pos_type pos) const;
115 int rightMargin(ParagraphMetrics const & pm) const;
116 int rightMargin(pit_type const pit) const;
118 /** this calculates the specified parameters. needed when setting
119 * the cursor and when creating a visible row */
120 void computeRowMetrics(pit_type pit, Row & row, int width) const;
123 void draw(PainterInfo & pi, int x, int y) const;
125 void drawParagraph(PainterInfo & pi, pit_type pit, int x, int y) const;
129 ParagraphMetrics & parMetrics(pit_type, bool redo_paragraph);
131 /// the minimum space a manual label needs on the screen in pixels
132 int labelFill(pit_type const pit, Row const & row) const;
135 int labelEnd(pit_type const pit) const;
137 /// sets row.end to the pos value *after* which a row should break.
138 /// for example, the pos after which isNewLine(pos) == true
139 pit_type rowBreakPoint(
145 /// sets row.width to the minimum space a row needs on the screen in pixel
149 pos_type const first,
153 /// Calculate and set the height of the row (width member is set to 0)
156 pos_type const first,
160 /// draw selection for a single row
161 void drawRowSelection(PainterInfo & pi, int x, Row const & row,
162 DocIterator const & beg, DocIterator const & end,
163 bool drawOnBegMargin, bool drawOnEndMargin) const;
167 /// returns the column near the specified x-coordinate of the row.
168 /// x is an absolute screen coord, it is set to the real beginning
170 pos_type getColumnNearX(pit_type pit, Row const & row, int & x,
171 bool & boundary) const;
173 /// returns pos in given par at given x coord.
174 pos_type x2pos(pit_type pit, int row, int x) const;
176 // FIXME: is there a need for this?
177 //int pos2x(pit_type pit, pos_type pos) const;
179 /** returns row near the specified
180 * y-coordinate in given paragraph (relative to the screen).
182 Row const & getRowNearY(int y,
185 /// returns the paragraph number closest to screen y-coordinate.
186 /// This method uses the BufferView CoordCache to locate the
187 /// paragraph. The y-coodinate is allowed to be off-screen and
188 /// the CoordCache will be automatically updated if needed. This is
189 /// the reason why we need a non const BufferView.
190 pit_type getPitNearY(int y);
192 /// sets cursor recursively descending into nested editable insets
194 \return the inset pointer if x,y is covering that inset
195 \param x,y are absolute screen coordinates.
196 \retval inset is non-null if the cursor is positionned inside
198 /// FIXME: cleanup to use BufferView::getCoveringInset() and
199 /// setCursorFromCoordinates() instead of checkInsetHit().
200 Inset * editXY(Cursor & cur, int x, int y);
202 /// sets cursor only within this Text.
203 /// x,y are screen coordinates
204 void setCursorFromCoordinates(Cursor & cur, int x, int y);
207 int cursorX(CursorSlice const & cursor,
208 bool boundary) const;
210 int cursorY(CursorSlice const & cursor,
211 bool boundary) const;
214 void cursorPrevious(Cursor & cur);
216 void cursorNext(Cursor & cur);
218 bool cursorHome(Cursor & cur);
220 bool cursorEnd(Cursor & cur);
222 void deleteLineForward(Cursor & cur);
224 /// is this row the last in the text?
225 bool isLastRow(pit_type pit, Row const & row) const;
226 /// is this row the first in the text?
227 bool isFirstRow(pit_type pit, Row const & row) const;
229 /// Returns an inset if inset was hit, or 0 if not.
230 /// \warning This method is not recursive! It will return the
231 /// outermost inset within this Text.
232 /// \sa BufferView::getCoveringInset() to get the innermost inset.
233 Inset * checkInsetHit(int x, int y);
236 * Returns the left beginning of the text.
237 * This information cannot be taken from the layout object, because
238 * in LaTeX the beginning of the text fits in some cases
239 * (for example sections) exactly the label-width.
241 int leftMargin(int max_width, pit_type pit, pos_type pos) const;
242 int leftMargin(int max_width, pit_type pit) const;
245 friend class BufferView;
247 /// The BufferView owner.
250 /// The text contents (the model).
251 /// \todo FIXME: this should be const.
255 /// A map from paragraph index number to paragraph metrics
256 typedef std::map<pit_type, ParagraphMetrics> ParMetricsCache;
258 mutable ParMetricsCache par_metrics_;
261 mutable Point origin_;
265 /// our 'outermost' font.
266 /// This is handed down from the surrounding
267 /// inset through the pi/mi parameter (pi.base.font)
268 /// It is used in applyOuterFont() and setCharFont() for reasons
269 /// that are not clear... to hand hand the outermost language and
270 /// also for char style apparently.
274 /// return the default height of a row in pixels, considering font zoom
275 int defaultRowHeight();
279 #endif // TEXT_METRICS_H