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290 lines
9.3 KiB
C++
290 lines
9.3 KiB
C++
// -*- C++ -*-
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/**
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* \file TextMetrics.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 Lars Gullik Bjønnes
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* \author John Levon
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* \author Abdelrazak Younes
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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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#ifndef TEXT_METRICS_H
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#define TEXT_METRICS_H
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#include "Font.h"
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#include "InsetList.h"
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#include "LayoutEnums.h"
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#include "ParagraphMetrics.h"
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#include "support/types.h"
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#include <map>
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namespace lyx {
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class BufferView;
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class Cursor;
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class CursorSlice;
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class MetricsInfo;
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class Text;
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/// A map from a Text to the map of paragraphs metrics
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class TextMetrics
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{
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/// noncopyable
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TextMetrics(TextMetrics const &);
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void operator=(TextMetrics const &);
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public:
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/// Default constructor (only here for STL containers).
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TextMetrics() : bv_(0), text_(0), max_width_(0), tight_(false) {}
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/// The only useful constructor.
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TextMetrics(BufferView *, Text *);
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///
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bool contains(pit_type pit) const;
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///
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void forget(pit_type pit);
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///
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std::pair<pit_type, ParagraphMetrics const *> first() const;
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///
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std::pair<pit_type, ParagraphMetrics const *> last() const;
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/// is this row the last in the text?
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bool isLastRow(Row const & row) const;
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/// is this row the first in the text?
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bool isFirstRow(Row const & row) const;
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///
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void setRowChanged(pit_type pit, pos_type pos);
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///
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Dimension const & dim() const { return dim_; }
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///
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Point const & origin() const { return origin_; }
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///
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ParagraphMetrics const & parMetrics(pit_type) const;
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///
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ParagraphMetrics & parMetrics(pit_type);
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///
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void newParMetricsDown();
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///
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void newParMetricsUp();
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/// Update metrics up to \c bv_height. Only usable for main text (for now).
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void updateMetrics(pit_type const anchor_pit, int const anchor_ypos,
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int const bv_height);
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/// compute text metrics.
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bool metrics(MetricsInfo const & mi, Dimension & dim, int min_width = 0);
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/// The "nodraw" drawing stage for one single paragraph: set the
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/// positions of the insets contained in this paragraph in metrics
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/// cache. Related to BufferView::updatePosCache.
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void updatePosCache(pit_type pit) const;
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/// Gets the fully instantiated font at a given position in a paragraph.
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/// Basically the same routine as Paragraph::getFont() in Paragraph.cpp.
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/// The difference is that this one is used for displaying, and thus we
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/// are allowed to make cosmetic improvements. For instance make footnotes
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/// smaller. (Asger)
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Font displayFont(pit_type pit, pos_type pos) const;
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/// Gets the fully instantiated label font of a paragraph.
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/// Basically the same routine as displayFont, but specialized for
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/// a layout font.
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Font labelDisplayFont(pit_type pit) const;
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/// There are currently two font mechanisms in LyX:
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/// 1. The font attributes in a lyxtext, and
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/// 2. The inset-specific font properties, defined in an inset's
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/// metrics() and draw() methods and handed down the inset chain through
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/// the pi/mi parameters, and stored locally in a lyxtext in font_.
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/// This is where the two are integrated in the final fully realized
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/// font.
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void applyOuterFont(Font &) const;
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/// is this position in the paragraph right-to-left?
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bool isRTL(CursorSlice const & sl, bool boundary) const;
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/// is between pos-1 and pos an RTL<->LTR boundary?
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bool isRTLBoundary(pit_type pit, pos_type pos) const;
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/// would be a RTL<->LTR boundary between pos and the given font?
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bool isRTLBoundary(pit_type pit, pos_type pos, Font const & font) const;
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/// Rebreaks the given paragraph.
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/// \retval true if a full screen redraw is needed.
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/// \retval false if a single paragraph redraw is enough.
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bool redoParagraph(pit_type const pit, bool align_rows = true);
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/// Clear cache of paragraph metrics
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void clear() { par_metrics_.clear(); }
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/// Is cache of paragraph metrics empty ?
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bool empty() const { return par_metrics_.empty(); }
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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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/// current text width.
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int width() const { return dim_.wid; }
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/// current text height.
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int height() const { return dim_.height(); }
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/**
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* Returns the left beginning of a row starting at \c pos.
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* This information cannot be taken from the layout object, because
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* in LaTeX the beginning of the text fits in some cases
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* (for example sections) exactly the label-width.
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*/
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int leftMargin(pit_type pit, pos_type pos) const;
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/// Return the left beginning of a row which is not the first one.
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/// This is the left margin when there is no indentation.
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int leftMargin(pit_type pit) const;
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///
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int rightMargin(ParagraphMetrics const & pm) const;
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int rightMargin(pit_type const pit) const;
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///
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void draw(PainterInfo & pi, int x, int y) const;
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void drawParagraph(PainterInfo & pi, pit_type pit, int x, int y) const;
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private:
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///
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ParagraphMetrics & parMetrics(pit_type, bool redo_paragraph);
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/// the minimum space a manual label needs on the screen in pixels
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int labelFill(Row const & row) const;
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// Turn paragraph oh index \c pit into a single row
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Row tokenizeParagraph(pit_type pit) const;
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// Break the row produced by tokenizeParagraph() into a list of rows.
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RowList breakParagraph(Row const & row) const;
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// Expands the alignment of row \param row in paragraph \param par
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LyXAlignment getAlign(Paragraph const & par, Row const & row) const;
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/// Aligns properly the row contents (computes spaces and fills)
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void setRowAlignment(Row & row, int width) const;
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/// Set the height of the row (without space above/below paragraph)
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void setRowHeight(Row & row) const;
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// Compute the space on top of a paragraph
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int parTopSpacing(pit_type pit) const;
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// Compute the space below a a paragraph
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int parBottomSpacing(pit_type pit) const;
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// Helper function for the other checkInsetHit method.
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InsetList::Element * checkInsetHit(pit_type pit, int x, int y);
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// Temporary public:
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public:
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/// returns the position near the specified x-coordinate of the row.
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/// x is an absolute screen coord, it is set to the real beginning
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/// of this column. This takes in account horizontal cursor row scrolling.
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pos_type getPosNearX(Row const & row, int & x, bool & boundary) const;
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/// returns pos in given par at given x coord.
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pos_type x2pos(pit_type pit, int row, int x) const;
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// FIXME: is there a need for this?
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//int pos2x(pit_type pit, pos_type pos) const;
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/// returns the row near the specified y-coordinate in a given paragraph
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/// (relative to the screen). If assert_in_view is true, it is made sure
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/// that the row is on screen completely; this might change the given pit.
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Row const & getPitAndRowNearY(int & y, pit_type & pit,
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bool assert_in_view, bool up);
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/// returns the paragraph number closest to screen y-coordinate.
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/// This method uses the BufferView CoordCache to locate the
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/// paragraph. The y-coodinate is allowed to be off-screen and
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/// the CoordCache will be automatically updated if needed. This is
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/// the reason why we need a non const BufferView.
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pit_type getPitNearY(int y);
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/// sets cursor recursively descending into nested editable insets
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/**
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\return the inset pointer if x,y is covering that inset
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\param x,y are absolute screen coordinates.
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\param assert_in_view if true the cursor will be set on a row
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that is completely visible
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\param up whether we are going up or down (only used when
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assert_in_view is true
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\retval inset is null if the cursor is positioned over normal
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text in the current Text object. Otherwise it is the inset
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that the cursor points to, like for Inset::editXY.
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*/
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/// FIXME: cleanup to use BufferView::getCoveringInset() and
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/// setCursorFromCoordinates() instead of checkInsetHit().
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Inset * editXY(Cursor & cur, int x, int y,
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bool assert_in_view = false, bool up = true);
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/// sets cursor only within this Text.
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/// x,y are screen coordinates
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void setCursorFromCoordinates(Cursor & cur, int x, int y);
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///
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int cursorX(CursorSlice const & sl, bool boundary) const;
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///
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int cursorY(CursorSlice const & sl, bool boundary) const;
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///
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bool cursorHome(Cursor & cur);
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///
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bool cursorEnd(Cursor & cur);
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///
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void deleteLineForward(Cursor & cur);
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/// Returns an inset if inset was hit, or 0 if not.
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/// \warning This method is not recursive! It will return the
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/// outermost inset within this Text.
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/// \sa BufferView::getCoveringInset() to get the innermost inset.
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Inset * checkInsetHit(int x, int y);
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/// calculates the position of a completion popup
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void completionPosAndDim(Cursor const & cur, int & x, int & y,
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Dimension & dim) const;
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private:
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/// The BufferView owner.
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BufferView * bv_;
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/// The text contents (the model).
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/// \todo FIXME: this should be const.
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Text * text_;
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/// A map from paragraph index number to paragraph metrics
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typedef std::map<pit_type, ParagraphMetrics> ParMetricsCache;
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///
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mutable ParMetricsCache par_metrics_;
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Dimension dim_;
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int max_width_;
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/// if true, do not expand insets to max width artificially
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bool tight_;
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mutable Point origin_;
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// temporary public:
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public:
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/// our 'outermost' font.
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/// This is handed down from the surrounding
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/// inset through the pi/mi parameter (pi.base.font)
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/// It is used in applyOuterFont() and setCharFont() for reasons
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/// that are not clear... to hand hand the outermost language and
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/// also for char style apparently.
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Font font_;
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};
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/// return the default height of a row in pixels, considering font zoom
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int defaultRowHeight();
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} // namespace lyx
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#endif // TEXT_METRICS_H
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