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8e7d0c2002
When using Qt stuff in breakAt, it may happen that the row is broken after an hyphen (whereas the old code would only consider spaces). The fact that we abuse the Row::right_boundary() property to detect when a row should be flushed broke justification when a row is cut at an hyphen. Fix this by introducing a new Row::flushed() property and set it as needed.
329 lines
8.8 KiB
C++
329 lines
8.8 KiB
C++
// -*- C++ -*-
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/**
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* \file Row.h
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Matthias Ettrich
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* \author Lars Gullik Bjønnes
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*
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* Full author contact details are available in file CREDITS.
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*
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* Metrics for an on-screen text row.
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*/
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#ifndef ROW_H
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#define ROW_H
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#include "Changes.h"
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#include "Dimension.h"
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#include "Font.h"
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#include "support/docstring.h"
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#include "support/types.h"
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#include <vector>
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namespace lyx {
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class DocIterator;
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class Inset;
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/**
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* An on-screen row of text. A paragraph is broken into a RowList for
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* display. Each Row contains a tokenized description of the contents
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* of the line.
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*/
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class Row {
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public:
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// Possible types of row elements
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enum Type {
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// a string of character
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STRING,
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/**
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* Something (completion, end-of-par marker)
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* that occupies space one screen but does not
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* correspond to any paragraph contents
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*/
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VIRTUAL,
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// An inset
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INSET,
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// Some spacing described by its width, not a string
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SPACE
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};
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/**
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* One element of a Row. It has a set of attributes that can be used
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* by other methods that need to parse the Row contents.
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*/
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struct Element {
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Element(Type const t, pos_type p, Font const & f, Change const & ch)
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: type(t), pos(p), endpos(p + 1), inset(0),
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extra(0), font(f), change(ch), final(false) {}
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// Return the number of separator in the element (only STRING type)
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int countSeparators() const;
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// Return total width of element, including separator overhead
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// FIXME: Cache this value or the number of expanders?
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double full_width() const { return dim.wid + extra * countExpanders(); }
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// Return the number of expanding characters in the element (only STRING
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// type).
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int countExpanders() const;
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// Return the amount of expansion: the number of expanding characters
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// that get stretched during justification, times the em of the font
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// (only STRING type).
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int expansionAmount() const;
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// set extra proportionally to the font em value.
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void setExtra(double extra_per_em);
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/** Return position in pixels (from the left) of position
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* \param i in the row element.
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*/
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double pos2x(pos_type const i) const;
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/** Return character position that is the closest to
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* pixel position \param x. The value \param x is
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* adjusted to the actual pixel position.
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*/
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pos_type x2pos(int &x) const;
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/** Break the element if possible, so that its width is less
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* than \param w. Returns true on success. When \param force
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* is true, the string is cut at any place, other wise it
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* respects the row breaking rules of characters.
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*/
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bool breakAt(int w, bool force);
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// Returns the position on left side of the element.
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pos_type left_pos() const;
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// Returns the position on right side of the element.
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pos_type right_pos() const;
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//
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bool isRTL() const { return font.isVisibleRightToLeft(); }
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// This is true for virtual elements.
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// Note that we do not use the type here. The two definitions
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// should be equivalent
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bool isVirtual() const { return pos == endpos; }
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// The kind of row element
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Type type;
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// position of the element in the paragraph
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pos_type pos;
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// first position after the element in the paragraph
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pos_type endpos;
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// The dimension of the chunk (does not contains the
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// separator correction)
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Dimension dim;
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// Non-zero only if element is an inset
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Inset const * inset;
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// Only non-null for justified rows
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double extra;
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// Non-empty if element is a string or is virtual
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docstring str;
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//
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Font font;
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//
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Change change;
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// is it possible to add contents to this element?
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bool final;
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friend std::ostream & operator<<(std::ostream & os, Element const & row);
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};
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///
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Row();
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///
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bool changed() const { return changed_; }
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///
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void setChanged(bool c) { changed_ = c; }
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///
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void setCrc(size_type crc) const;
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/// Set the selection begin and end.
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/**
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* This is const because we update the selection status only at draw()
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* time.
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*/
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void setSelection(pos_type sel_beg, pos_type sel_end) const;
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///
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bool selection() const;
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/// Set the selection begin and end and whether the left and/or right
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/// margins are selected.
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void setSelectionAndMargins(DocIterator const & beg,
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DocIterator const & end) const;
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///
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void pit(pit_type p) { pit_ = p; }
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///
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pit_type pit() const { return pit_; }
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///
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void pos(pos_type p) { pos_ = p; }
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///
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pos_type pos() const { return pos_; }
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///
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void endpos(pos_type p) { end_ = p; }
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///
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pos_type endpos() const { return end_; }
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///
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void right_boundary(bool b) { right_boundary_ = b; }
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///
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bool right_boundary() const { return right_boundary_; }
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///
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void flushed(bool b) { flushed_ = b; }
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///
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bool flushed() const { return flushed_; }
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///
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Dimension const & dimension() const { return dim_; }
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///
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Dimension & dimension() { return dim_; }
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///
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int height() const { return dim_.height(); }
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/// The width of the row, including the left margin, but not the right one.
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int width() const { return dim_.wid; }
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///
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int ascent() const { return dim_.asc; }
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///
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int descent() const { return dim_.des; }
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/// The offset of the left-most cursor position on the row
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int left_x() const;
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/// The offset of the right-most cursor position on the row
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int right_x() const;
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// Return the number of separators in the row
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int countSeparators() const;
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// Set the extra spacing for every expanding character in STRING-type
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// elements. \param w is the total amount of extra width for the row to be
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// distributed among expanders. \return false if the justification fails.
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bool setExtraWidth(int w);
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///
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void add(pos_type pos, Inset const * ins, Dimension const & dim,
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Font const & f, Change const & ch);
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///
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void add(pos_type pos, char_type const c,
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Font const & f, Change const & ch);
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///
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void addVirtual(pos_type pos, docstring const & s,
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Font const & f, Change const & ch);
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///
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void addSpace(pos_type pos, int width, Font const & f, Change const & ch);
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///
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typedef std::vector<Element> Elements;
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///
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typedef Elements::iterator iterator;
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///
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typedef Elements::const_iterator const_iterator;
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///
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iterator begin() { return elements_.begin(); }
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///
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iterator end() { return elements_.end(); }
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///
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const_iterator begin() const { return elements_.begin(); }
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///
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const_iterator end() const { return elements_.end(); }
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///
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bool empty() const { return elements_.empty(); }
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///
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Element & front() { return elements_.front(); }
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///
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Element const & front() const { return elements_.front(); }
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///
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Element & back() { return elements_.back(); }
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///
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Element const & back() const { return elements_.back(); }
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/// remove last element
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void pop_back();
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/// remove all row elements
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void clear() { elements_.clear(); }
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/**
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* if row width is too large, remove all elements after last
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* separator and update endpos if necessary. If all that
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* remains is a large word, cut it to \param width.
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* \param body_pos minimum amount of text to keep.
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* \param width maximum width of the row.
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* \param available width on next row.
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* \return true if the row has been shortened.
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*/
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bool shortenIfNeeded(pos_type const body_pos, int const width, int const next_width);
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/**
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* If last element of the row is a string, compute its width
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* and mark it final.
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*/
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void finalizeLast();
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/**
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* Find sequences of right-to-left elements and reverse them.
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* This should be called once the row is completely built.
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*/
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void reverseRTL(bool rtl_par);
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friend std::ostream & operator<<(std::ostream & os, Row const & row);
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/// additional width for separators in justified rows (i.e. space)
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double separator;
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/// width of hfills in the label
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double label_hfill;
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/// the left margin position of the row
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int left_margin;
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/// the right margin of the row
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int right_margin;
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///
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mutable pos_type sel_beg;
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///
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mutable pos_type sel_end;
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///
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mutable bool begin_margin_sel;
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///
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mutable bool end_margin_sel;
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private:
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/// Decides whether the margin is selected.
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/**
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* \param margin_begin
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* \param beg
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* \param end
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*/
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bool isMarginSelected(bool left_margin, DocIterator const & beg,
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DocIterator const & end) const;
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/**
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* Returns true if a char or string with font \c f and change
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* type \c ch can be added to the current last element of the
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* row.
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*/
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bool sameString(Font const & f, Change const & ch) const;
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///
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Elements elements_;
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/// has the Row appearance changed since last drawing?
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mutable bool changed_;
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/// CRC of row contents.
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mutable size_type crc_;
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/// Index of the paragraph that contains this row
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pit_type pit_;
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/// first pos covered by this row
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pos_type pos_;
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/// one behind last pos covered by this row
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pos_type end_;
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// Is there a boundary at the end of the row (display inset...)
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bool right_boundary_;
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// Shall the row be flushed when it is supposed to be justified?
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bool flushed_;
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/// Row dimension.
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Dimension dim_;
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};
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} // namespace lyx
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#endif
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