lyx_mirror/src/TextMetrics.h

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// -*- C++ -*-
/**
* \file TextMetrics.h
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Lars Gullik Bj<EFBFBD>nnes
* \author John Levon
* \author Abdelrazak Younes
*
* Full author contact details are available in file CREDITS.
*/
#ifndef TEXT_METRICS_H
#define TEXT_METRICS_H
#include "Font.h"
// FIXME: We only need Point class definition, not the full
// CoordCache.
#include "CoordCache.h"
#include "ParagraphMetrics.h"
#include "support/types.h"
#include <boost/utility.hpp>
#include <boost/tuple/tuple.hpp>
#include <map>
namespace lyx {
class BufferView;
class DocIterator;
class MetricsInfo;
class Text;
/// A map from a Text to the map of paragraphs metrics
class TextMetrics
{
public:
/// Default constructor (only here for STL containers).
TextMetrics(): text_(0) {}
/// The only useful constructor.
TextMetrics(BufferView *, Text *);
///
bool has(pit_type pit) const;
///
ParagraphMetrics const & parMetrics(pit_type) const;
///
std::pair<pit_type, ParagraphMetrics const *> first() const;
///
std::pair<pit_type, ParagraphMetrics const *> last() const;
///
int parPosition(pit_type pit) const;
///
Dimension const & dimension() const { return dim_; }
Point const & origin() const { return origin_; }
/// compute text metrics.
bool metrics(MetricsInfo & mi, Dimension & dim, int min_width = 0);
///
void newParMetricsDown();
///
void newParMetricsUp();
/// Gets the fully instantiated font at a given position in a paragraph
/// Basically the same routine as Paragraph::getFont() in Paragraph.cpp.
/// The difference is that this one is used for displaying, and thus we
/// are allowed to make cosmetic improvements. For instance make footnotes
/// smaller. (Asger)
Font getDisplayFont(pit_type pit,
pos_type pos) const;
/// There are currently two font mechanisms in LyX:
/// 1. The font attributes in a lyxtext, and
/// 2. The inset-specific font properties, defined in an inset's
/// metrics() and draw() methods and handed down the inset chain through
/// the pi/mi parameters, and stored locally in a lyxtext in font_.
/// This is where the two are integrated in the final fully realized
/// font.
void applyOuterFont(Font &) const;
/// is this position in the paragraph right-to-left?
bool isRTL(CursorSlice const & sl, bool boundary) const;
/// is between pos-1 and pos an RTL<->LTR boundary?
bool isRTLBoundary(pit_type pit,
pos_type pos) const;
/// would be a RTL<->LTR boundary between pos and the given font?
bool isRTLBoundary(pit_type pit,
pos_type pos, Font const & font) const;
/// Rebreaks the given paragraph.
/// \retval true if a full screen redraw is needed.
/// \retval false if a single paragraph redraw is enough.
bool redoParagraph(pit_type const pit);
/// Clear cache of paragraph metrics
void clear() { par_metrics_.clear(); }
///
int ascent() const { return dim_.asc; }
///
int descent() const { return dim_.des; }
/// current text width.
int width() const { return dim_.wid; }
/// current text heigth.
int height() const { return dim_.height(); }
///
int maxWidth() const { return max_width_; }
///
int singleWidth(pit_type const pit, pos_type pos) const;
///
int rightMargin(ParagraphMetrics const & pm) const;
int rightMargin(pit_type const pit) const;
/** this calculates the specified parameters. needed when setting
* the cursor and when creating a visible row */
void computeRowMetrics(pit_type pit, Row & row, int width) const;
///
void draw(PainterInfo & pi, int x, int y) const;
void drawParagraph(PainterInfo & pi, pit_type pit, int x, int y) const;
private:
///
ParagraphMetrics & parMetrics(pit_type, bool redo_paragraph);
/// draw textselection.
/// FIXME: simplify to just to single row painting.
void drawSelection(PainterInfo & pi,
DocIterator const & beg, ///< selection begin.
DocIterator const & end, ///< selection end.
int x) const;
/// the minimum space a manual label needs on the screen in pixels
int labelFill(pit_type const pit, Row const & row) const;
/// FIXME??
int labelEnd(pit_type const pit) const;
/// sets row.end to the pos value *after* which a row should break.
/// for example, the pos after which isNewLine(pos) == true
pit_type rowBreakPoint(
int width,
pit_type const pit,
pit_type first
) const;
/// sets row.width to the minimum space a row needs on the screen in pixel
int rowWidth(
int right_margin,
pit_type const pit,
pos_type const first,
pos_type const end
) const;
/// Calculate and set the height of the row
boost::tuple<int, int> rowHeight(
pit_type const pit,
pos_type const first,
pos_type const end
) const;
/// draw selection for a single row
void drawRowSelection(PainterInfo & pi, int x, Row const & row,
DocIterator const & beg, DocIterator const & end,
bool drawOnBegMargin, bool drawOnEndMargin) const;
// Temporary public:
public:
/// returns the column near the specified x-coordinate of the row.
/// x is an absolute screen coord, it is set to the real beginning
/// of this column.
pos_type getColumnNearX(pit_type pit, Row const & row, int & x,
bool & boundary) const;
/// returns pos in given par at given x coord.
pos_type x2pos(pit_type pit, int row, int x) const;
// FIXME: is there a need for this?
//int pos2x(pit_type pit, pos_type pos) const;
/** returns row near the specified
* y-coordinate in given paragraph (relative to the screen).
*/
Row const & getRowNearY(int y,
pit_type pit) const;
/// returns the paragraph number closest to screen y-coordinate.
/// This method uses the BufferView CoordCache to locate the
/// paragraph. The y-coodinate is allowed to be off-screen and
/// the CoordCache will be automatically updated if needed. This is
/// the reason why we need a non const BufferView.
pit_type getPitNearY(int y);
/// sets cursor recursively descending into nested editable insets
/**
\return the inset pointer if x,y is covering that inset
\param x,y are absolute screen coordinates.
\retval inset is non-null if the cursor is positionned inside
*/
/// FIXME: cleanup to use BufferView::getCoveringInset() and
/// setCursorFromCoordinates() instead of checkInsetHit().
Inset * editXY(Cursor & cur, int x, int y);
/// sets cursor only within this Text.
/// x,y are screen coordinates
void setCursorFromCoordinates(Cursor & cur, int x, int y);
///
int cursorX(CursorSlice const & cursor,
bool boundary) const;
///
int cursorY(CursorSlice const & cursor,
bool boundary) const;
///
void cursorPrevious(Cursor & cur);
///
void cursorNext(Cursor & cur);
///
bool cursorHome(Cursor & cur);
///
bool cursorEnd(Cursor & cur);
///
void deleteLineForward(Cursor & cur);
/// is this row the last in the text?
bool isLastRow(pit_type pit, Row const & row) const;
/// is this row the first in the text?
bool isFirstRow(pit_type pit, Row const & row) const;
/// Returns an inset if inset was hit, or 0 if not.
/// \warning This method is not recursive! It will return the
/// outermost inset within this Text.
/// \sa BufferView::getCoveringInset() to get the innermost inset.
Inset * checkInsetHit(int x, int y);
/**
* Returns the left beginning of the text.
* This information cannot be taken from the layout object, because
* in LaTeX the beginning of the text fits in some cases
* (for example sections) exactly the label-width.
*/
int leftMargin(int max_width, pit_type pit, pos_type pos) const;
int leftMargin(int max_width, pit_type pit) const;
private:
/// The BufferView owner.
BufferView * bv_;
/// The text contents (the model).
/// \todo FIXME: this should be const.
Text * text_;
bool main_text_;
/// A map from paragraph index number to paragraph metrics
typedef std::map<pit_type, ParagraphMetrics> ParMetricsCache;
///
mutable ParMetricsCache par_metrics_;
Dimension dim_;
int max_width_;
mutable Point origin_;
// temporary public:
public:
/// our 'outermost' font.
/// This is handed down from the surrounding
/// inset through the pi/mi parameter (pi.base.font)
/// It is used in applyOuterFont() and setCharFont() for reasons
/// that are not clear... to hand hand the outermost language and
/// also for char style apparently.
Font font_;
};
/// return the default height of a row in pixels, considering font zoom
int defaultRowHeight();
} // namespace lyx
#endif // TEXT_METRICS_H