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 "InsetList.h"
19 #include "LayoutEnums.h"
20 #include "ParagraphMetrics.h"
22 #include "support/types.h"
33 /// A map from a Text to the map of paragraphs metrics
37 TextMetrics(TextMetrics const &);
38 void operator=(TextMetrics const &);
40 /// Default constructor (only here for STL containers).
41 TextMetrics() : bv_(0), text_(0), max_width_(0) {}
42 /// The only useful constructor.
43 TextMetrics(BufferView *, Text *);
46 bool contains(pit_type pit) const;
48 pit_type firstPit() const;
50 pit_type lastPit() const;
52 /// is this row the last in the text?
53 bool isLastRow(Row const & row) const;
54 /// is this row the first in the text?
55 bool isFirstRow(Row const & row) const;
57 void setRowChanged(pit_type pit, pos_type pos);
60 Dimension const & dim() const { return dim_; }
62 Point const & origin() const { return origin_; }
66 ParagraphMetrics const & parMetrics(pit_type) const;
68 void newParMetricsDown();
70 void newParMetricsUp();
72 /// compute text metrics.
73 bool metrics(MetricsInfo & mi, Dimension & dim, int min_width = 0,
74 bool const expand_on_multipars = true);
76 /// The "nodraw" drawing stage for one single paragraph: set the
77 /// positions of the insets contained this paragraph in metrics
78 /// cache. Related to BufferView::updatePosCache.
79 void updatePosCache(pit_type pit) const;
81 /// Gets the fully instantiated font at a given position in a paragraph
82 /// Basically the same routine as Paragraph::getFont() in Paragraph.cpp.
83 /// The difference is that this one is used for displaying, and thus we
84 /// are allowed to make cosmetic improvements. For instance make footnotes
86 Font displayFont(pit_type pit, pos_type pos) const;
88 /// There are currently two font mechanisms in LyX:
89 /// 1. The font attributes in a lyxtext, and
90 /// 2. The inset-specific font properties, defined in an inset's
91 /// metrics() and draw() methods and handed down the inset chain through
92 /// the pi/mi parameters, and stored locally in a lyxtext in font_.
93 /// This is where the two are integrated in the final fully realized
95 void applyOuterFont(Font &) const;
97 /// is this position in the paragraph right-to-left?
98 bool isRTL(CursorSlice const & sl, bool boundary) const;
99 /// is between pos-1 and pos an RTL<->LTR boundary?
100 bool isRTLBoundary(pit_type pit,
102 /// would be a RTL<->LTR boundary between pos and the given font?
103 bool isRTLBoundary(pit_type pit,
104 pos_type pos, Font const & font) const;
107 /// Rebreaks the given paragraph.
108 /// \retval true if a full screen redraw is needed.
109 /// \retval false if a single paragraph redraw is enough.
110 bool redoParagraph(pit_type const pit, bool align_rows = true);
111 /// Clear cache of paragraph metrics
112 void clear() { par_metrics_.clear(); }
113 /// Is cache of paragraph metrics empty ?
114 bool empty() const { return par_metrics_.empty(); }
117 int ascent() const { return dim_.asc; }
119 int descent() const { return dim_.des; }
120 /// current text width.
121 int width() const { return dim_.wid; }
122 /// current text height.
123 int height() const { return dim_.height(); }
126 int rightMargin(ParagraphMetrics const & pm) const;
128 int rightMargin(pit_type const pit) const;
130 /// position of the top of the first paragraph.
131 int topPosition() const;
132 /// position of the bottom of the last paragraph.
133 int bottomPosition() const;
136 void draw(PainterInfo & pi, int x, int y) const;
138 void drawParagraph(PainterInfo & pi, pit_type pit, int x, int y) const;
142 ParagraphMetrics & parMetrics(pit_type, bool redo_paragraph);
145 * Returns the left beginning of the text.
146 * This information cannot be taken from the layout object, because
147 * in LaTeX the beginning of the text fits in some cases
148 * (for example sections) exactly the label-width.
150 int leftMargin(pit_type pit, pos_type pos) const;
151 int leftMargin(pit_type pit) const;
153 /// the minimum space a manual label needs on the screen in pixels
154 int labelFill(Row const & row) const;
157 int labelEnd(pit_type const pit) const;
159 /// sets row.end to the pos value *after* which a row should break.
160 /// for example, the pos after which isNewLine(pos) == true
161 /// \return true when another row is required (after a newline)
162 bool breakRow(Row & row, int right_margin) const;
164 // Expands the alignment of row \param row in paragraph \param par
165 LyXAlignment getAlign(Paragraph const & par, Row const & row) const;
166 /// Aligns properly the row contents (computes spaces and fills)
167 void setRowAlignment(Row & row, int width) const;
169 /// Set the height of the row (without space above/below paragraph)
170 void setRowHeight(Row & row) const;
171 // Compute the space on top of a paragraph
172 int parTopSpacing(pit_type pit) const;
173 // Compute the space below a a paragraph
174 int parBottomSpacing(pit_type pit) const;
176 // Helper function for the other checkInsetHit method.
177 InsetList::Element * checkInsetHit(pit_type pit, int x, int y);
182 /// returns the position near the specified x-coordinate of the row.
183 /// x is an absolute screen coord, it is set to the real beginning
184 /// of this column. This takes in account horizontal cursor row scrolling.
185 pos_type getPosNearX(Row const & row, int & x, bool & boundary) const;
187 /// returns pos in given par at given x coord.
188 pos_type x2pos(pit_type pit, int row, int x) const;
190 // FIXME: is there a need for this?
191 //int pos2x(pit_type pit, pos_type pos) const;
193 /// returns the row near the specified y-coordinate in a given paragraph
194 /// (relative to the screen). If assert_in_view is true, it is made sure
195 /// that the row is on screen completely; this might change the given pit.
196 Row const & getPitAndRowNearY(int & y, pit_type & pit,
197 bool assert_in_view, bool up);
199 /// returns the paragraph number closest to screen y-coordinate.
200 /// This method uses the BufferView CoordCache to locate the
201 /// paragraph. The y-coodinate is allowed to be off-screen and
202 /// the CoordCache will be automatically updated if needed. This is
203 /// the reason why we need a non const BufferView.
204 pit_type getPitNearY(int y);
206 /// sets cursor recursively descending into nested editable insets
208 \return the inset pointer if x,y is covering that inset
209 \param x,y are absolute screen coordinates.
210 \param assert_in_view if true the cursor will be set on a row
211 that is completely visible
212 \param up whether we are going up or down (only used when
213 assert_in_view is true
214 \retval inset is null if the cursor is positioned over normal
215 text in the current Text object. Otherwise it is the inset
216 that the cursor points to, like for Inset::editXY.
218 /// FIXME: cleanup to use BufferView::getCoveringInset() and
219 /// setCursorFromCoordinates() instead of checkInsetHit().
220 Inset * editXY(Cursor & cur, int x, int y,
221 bool assert_in_view = false, bool up = true);
223 /// sets cursor only within this Text.
224 /// x,y are screen coordinates
225 void setCursorFromCoordinates(Cursor & cur, int x, int y);
228 int cursorX(CursorSlice const & cursor, bool boundary) const;
230 int cursorY(CursorSlice const & cursor, bool boundary) const;
233 bool cursorHome(Cursor & cur);
235 bool cursorEnd(Cursor & cur);
237 void deleteLineForward(Cursor & cur);
239 /// Returns an inset if inset was hit, or 0 if not.
240 /// \warning This method is not recursive! It will return the
241 /// outermost inset within this Text.
242 /// \sa BufferView::getCoveringInset() to get the innermost inset.
243 Inset * checkInsetHit(int x, int y);
245 /// calculates the position of a completion popup
246 void completionPosAndDim(Cursor const & cur, int & x, int & y,
247 Dimension & dim) const;
250 friend class BufferView;
252 /// The BufferView owner.
255 /// The text contents (the model).
256 /// \todo FIXME: this should be const.
259 /// A map from paragraph index number to paragraph metrics
260 typedef std::map<pit_type, ParagraphMetrics> ParMetricsCache;
262 mutable ParMetricsCache par_metrics_;
265 mutable Point origin_;
269 /// our 'outermost' font.
270 /// This is handed down from the surrounding
271 /// inset through the pi/mi parameter (pi.base.font)
272 /// It is used in applyOuterFont() and setCharFont() for reasons
273 /// that are not clear... to hand hand the outermost language and
274 /// also for char style apparently.
278 /// return the default height of a row in pixels, considering font zoom
279 int defaultRowHeight();
283 #endif // TEXT_METRICS_H