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363 lines
9.9 KiB
C++
363 lines
9.9 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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* Helper function: set variable \c var to value \c val, and mark
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* row as changed is the values were different. This is intended
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* for use when changing members of the row object.
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*/
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template<class T1, class T2>
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void change(T1 & var, T2 const val) {
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if (var != val)
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changed(true);
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var = val;
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}
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/**
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* Helper function: set variable \c var to value \c val, and mark
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* row as changed is the values were different. This is intended
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* for use when changing members of the row object.
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* This is the const version, useful for mutable members.
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*/
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template<class T1, class T2>
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void change(T1 & var, T2 const val) const {
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if (var != val)
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changed(true);
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var = val;
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}
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///
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bool changed() const { return changed_; }
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///
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void changed(bool c) const { changed_ = c; }
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///
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bool selection() const;
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/**
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* Set the selection begin and end and whether the left and/or
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* right margins are selected.
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* This is const because we update the selection status only at
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* draw() time.
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*/
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void setSelectionAndMargins(DocIterator const & beg,
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DocIterator const & end) const;
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/// no selection on this row.
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void clearSelectionAndMargins() 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 & dim() const { return dim_; }
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///
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Dimension & dim() { 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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///
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bool isRTL() const { return rtl_; }
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///
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bool needsChangeBar() const { return changebar_; }
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///
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void needsChangeBar(bool ncb) { changebar_ = ncb; }
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/// Find row element that contains \c pos, and compute x offset.
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const_iterator const findElement(pos_type pos, bool boundary, double & x) const;
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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, DocIterator const & beg,
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DocIterator const & end) const;
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/// Set the selection begin and end.
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void setSelection(pos_type sel_beg, pos_type sel_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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/// 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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/// true when this row lives in a right-to-left paragraph
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bool rtl_;
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/// true when a changebar should be drawn in the margin
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bool changebar_;
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};
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} // namespace lyx
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#endif
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