src/Text.h

   1 // -*- C++ -*-
   2 /**
   3  * \file Text.h
   4  * This file is part of LyX, the document processor.
   5  * Licence details can be found in the file COPYING.
   6  *
   7  * \author unknown
   8  * \author Lars Gullik Bjønnes
   9  * \author John Levon
  10  *
  11  * Full author contact details are available in file CREDITS.
  12  */
  13
  14 #ifndef TEXT_H
  15 #define TEXT_H
  16
  17 #include "DocIterator.h"
  18 #include "ParagraphList.h"
  19
  20 namespace lyx {
  21
  22 class Buffer;
  23 class BufferParams;
  24 class BufferView;
  25 class CompletionList;
  26 class Cursor;
  27 class CursorSlice;
  28 class DocIterator;
  29 class ErrorList;
  30 class Font;
  31 class FontInfo;
  32 class FuncRequest;
  33 class FuncStatus;
  34 class Inset;
  35 class Lexer;
  36 class PainterInfo;
  37 class Spacing;
  38
  39 /// This class encapsulates the main text data and operations in LyX
  40 class Text {
  41 public:
  42         /// constructor
  43         explicit Text(InsetText * owner)
  44                 : owner_(owner), autoBreakRows_(false), undo_counter_(0)
  45         {}
  46
  47         /// \return true if there's no content at all.
  48         /// \warning a non standard layout on an empty paragraph doesn't
  49         // count as empty.
  50         bool empty() const;
  51         /// Access to owner InsetText.
  52         InsetText const & inset() const;
  53
  54         ///
  55         FontInfo layoutFont(pit_type pit) const;
  56         ///
  57         FontInfo labelFont(Paragraph const & par) const;
  58         /** Set font of character at position \p pos in paragraph \p pit.
  59          *  Must not be called if \p pos denotes an inset with text contents,
  60          *  and the inset is not allowed inside a font change (see below).
  61          */
  62         void setCharFont(pit_type pit, pos_type pos,
  63                 Font const & font, Font const & display_font);
  64
  65         /** Needed to propagate font changes to all text cells of insets
  66          *  that are not allowed inside a font change (bug 1973).
  67          *  Must not be called if \p pos denotes an ordinary character or an
  68          *  inset that is alowed inside a font change.
  69          *  FIXME: This should be removed, see documentation of noFontChange
  70          *  in insetbase.h
  71          */
  72         void setInsetFont(BufferView const & bv, pit_type pit, pos_type pos,
  73                 Font const & font, bool toggleall = false);
  74
  75         /// what you expect when pressing \<enter\> at cursor position
  76         void breakParagraph(Cursor & cur, bool inverse_logic = false);
  77
  78         /// set layout over selection
  79         void setLayout(pit_type start, pit_type end,
  80                 docstring const & layout);
  81         /// Set given layout to current cursor position.
  82         /// FIXME: replace Cursor with DocIterator.
  83         void setLayout(Cursor & cur, docstring const & layout);
  84
  85         /// what type of depth change to make
  86         enum DEPTH_CHANGE {
  87                 INC_DEPTH,
  88                 DEC_DEPTH
  89         };
  90         /// Increase or decrease the nesting depth of the selected paragraph(s)
  91         /// FIXME: replace Cursor with DocIterator.
  92         void changeDepth(Cursor & cur, DEPTH_CHANGE type);
  93
  94         /// Returns whether something would be changed by changeDepth
  95         /// FIXME: replace Cursor with DocIterator.
  96         bool changeDepthAllowed(Cursor & cur, DEPTH_CHANGE type) const;
  97
  98         /// Set font over selection paragraphs and rebreak.
  99         /// FIXME: replace Cursor with DocIterator.
 100         void setFont(Cursor & cur, Font const &, bool toggleall = false);
 101         /// Set font from \p begin to \p end and rebreak.
 102         void setFont(BufferView const & bv, CursorSlice const & begin,
 103                 CursorSlice const & end, Font const &,
 104                 bool toggleall = false);
 105
 106         ///
 107         void toggleFree(Cursor & cur, Font const &, bool toggleall = false);
 108
 109         /// ???
 110         /// FIXME: replace Cursor with DocIterator.
 111         docstring getStringToIndex(Cursor const & cur);
 112
 113         /// Convert the paragraphs to a string.
 114         /// \param AsStringParameter options. This can contain any combination of
 115         /// asStringParameter values. Valid examples:
 116         ///             asString(AS_STR_LABEL)
 117         ///             asString(AS_STR_LABEL | AS_STR_INSETS)
 118         ///             asString(AS_STR_INSETS)
 119         docstring asString(int options = AS_STR_NONE) const;
 120         ///
 121         docstring asString(pit_type beg, pit_type end,
 122                 int options = AS_STR_NONE) const;
 123
 124         /// insert a character at cursor position
 125         /// FIXME: replace Cursor with DocIterator.
 126         void insertChar(Cursor & cur, char_type c);
 127         /// insert an inset at cursor position
 128         /// FIXME: replace Cursor with DocIterator.
 129         void insertInset(Cursor & cur, Inset * inset);
 130
 131         /// try to handle that request
 132         /// FIXME: replace Cursor with DocIterator.
 133         void dispatch(Cursor & cur, FuncRequest & cmd);
 134         /// do we want to handle this event?
 135         bool getStatus(Cursor & cur, FuncRequest const & cmd,
 136                 FuncStatus & status) const;
 137
 138         /// read-only access to individual paragraph
 139         Paragraph const & getPar(pit_type pit) const { return pars_[pit]; }
 140         /// read-write access to individual paragraph
 141         Paragraph & getPar(pit_type pit) { return pars_[pit]; }
 142         // Returns the current font and depth as a message.
 143         /// FIXME: replace Cursor with DocIterator.
 144         docstring currentState(Cursor const & cur) const;
 145
 146         /** Find the word under \c from in the relative location
 147          *  defined by \c word_location.
 148          *  @param from return here the start of the word
 149          *  @param to return here the end of the word
 150          */
 151         void getWord(CursorSlice & from, CursorSlice & to, word_location const) const;
 152         /// just selects the word the cursor is in
 153         void selectWord(Cursor & cur, word_location loc);
 154         /// select all text
 155         void selectAll(Cursor & cur);
 156         /// convenience function get the previous word or an empty string
 157         docstring previousWord(CursorSlice const & sl) const;
 158
 159         /// what type of change operation to make
 160         enum ChangeOp {
 161                 ACCEPT,
 162                 REJECT
 163         };
 164         /// accept or reject the selected change
 165         void acceptOrRejectChanges(Cursor & cur, ChangeOp op);
 166         /// accept the changes within the complete Text
 167         void acceptChanges();
 168         /// reject the changes within the complete Text
 169         void rejectChanges();
 170
 171         /// returns true if par was empty and was removed
 172         bool setCursor(Cursor & cur, pit_type par, pos_type pos,
 173                        bool setfont = true, bool boundary = false);
 174         ///
 175         void setCursor(CursorSlice &, pit_type par, pos_type pos);
 176         ///
 177         void setCursorIntern(Cursor & cur, pit_type par,
 178                  pos_type pos, bool setfont = true, bool boundary = false);
 179
 180         ///
 181         void recUndo(Cursor & cur, pit_type first, pit_type last) const;
 182         ///
 183         void recUndo(Cursor & cur, pit_type first) const;
 184
 185         /// Move cursor one position backwards
 186         /**
 187          * Returns true if an update is needed after the move.
 188          */
 189         bool cursorBackward(Cursor & cur);
 190         /// Move cursor visually one position to the left
 191         /**
 192          * \param skip_inset if true, don't enter insets
 193          * Returns true if an update is needed after the move.
 194          */
 195         bool cursorVisLeft(Cursor & cur, bool skip_inset = false);
 196         /// Move cursor one position forward
 197         /**
 198          * Returns true if an update is needed after the move.
 199          */
 200         bool cursorForward(Cursor & cur);
 201         /// Move cursor visually one position to the right
 202         /**
 203          * \param skip_inset if true, don't enter insets
 204          * Returns true if an update is needed after the move.
 205          */
 206         bool cursorVisRight(Cursor & cur, bool skip_inset = false);
 207         ///
 208         bool cursorBackwardOneWord(Cursor & cur);
 209         ///
 210         bool cursorForwardOneWord(Cursor & cur);
 211         ///
 212         bool cursorVisLeftOneWord(Cursor & cur);
 213         ///
 214         bool cursorVisRightOneWord(Cursor & cur);
 215         /// Delete from cursor up to the end of the current or next word.
 216         void deleteWordForward(Cursor & cur);
 217         /// Delete from cursor to start of current or prior word.
 218         void deleteWordBackward(Cursor & cur);
 219         ///
 220         bool cursorUpParagraph(Cursor & cur);
 221         ///
 222         bool cursorDownParagraph(Cursor & cur);
 223         ///
 224         bool cursorTop(Cursor & cur);
 225         ///
 226         bool cursorBottom(Cursor & cur);
 227         /// Erase character at cursor. Honour change tracking
 228         /// FIXME: replace Cursor with DocIterator.
 229         bool erase(Cursor & cur);
 230         /// Delete character before cursor. Honour CT
 231         /// FIXME: replace Cursor with DocIterator.
 232         bool backspace(Cursor & cur);
 233         // Dissolve the inset under cursor
 234         /// FIXME: replace Cursor with DocIterator.
 235         bool dissolveInset(Cursor & cur);
 236         ///
 237         bool selectWordWhenUnderCursor(Cursor & cur, word_location);
 238         /// Change the case of the word at cursor position.
 239         void changeCase(Cursor & cur, TextCase action);
 240         /// Transposes the character at the cursor with the one before it
 241         void charsTranspose(Cursor & cur);
 242
 243         /** the DTP switches for paragraphs. LyX will store the top settings
 244          always in the first physical paragraph, the bottom settings in the
 245          last. When a paragraph is broken, the top settings rest, the bottom
 246          settings are given to the new one.
 247          This function will handle a multi-paragraph selection.
 248          */
 249         void setParagraphs(Cursor & cur, docstring arg, bool modify = false);
 250         /// Sets parameters for current or selected paragraphs
 251         void setParagraphs(Cursor & cur, ParagraphParameters const & p);
 252
 253         /* these things are for search and replace */
 254
 255         /// needed to insert the selection
 256         void insertStringAsLines(DocIterator const & dit, docstring const & str,
 257                 Font const & font);
 258         /// needed to insert the selection
 259         void insertStringAsParagraphs(DocIterator const & dit, docstring const & str,
 260                 Font const & font);
 261
 262         /// access to our paragraphs
 263         ParagraphList const & paragraphs() const { return pars_; }
 264         ParagraphList & paragraphs() { return pars_; }
 265         /// return true if this is the main text
 266         bool isMainText() const;
 267
 268         ///
 269         double spacing(Paragraph const & par) const;
 270         /// make a suggestion for a label
 271         /// FIXME: replace Cursor with DocIterator.
 272         docstring getPossibleLabel(Cursor const & cur) const;
 273         /// is this paragraph right-to-left?
 274         bool isRTL(Paragraph const & par) const;
 275
 276         ///
 277         bool checkAndActivateInset(Cursor & cur, bool front);
 278         ///
 279         bool checkAndActivateInsetVisual(Cursor & cur, bool movingForward, bool movingLeft);
 280
 281         ///
 282         void write(std::ostream & os) const;
 283         /// returns true if \end_document has not been read
 284         /// insetPtr is the containing Inset
 285         bool read(Lexer & lex, ErrorList & errorList,
 286                   InsetText * insetPtr);
 287
 288         /// delete double spaces, leading spaces, and empty paragraphs around old cursor.
 289         /// \retval true if a change has happened and we need a redraw.
 290         /// FIXME: replace Cursor with DocIterator. This is not possible right
 291         /// now because recordUndo() is called which needs a Cursor.
 292         static bool deleteEmptyParagraphMechanism(Cursor & cur,
 293                 Cursor & old, bool & need_anchor_change);
 294
 295         /// delete double spaces, leading spaces, and empty paragraphs
 296         /// from \first to \last paragraph
 297         void deleteEmptyParagraphMechanism(pit_type first, pit_type last, bool trackChanges);
 298
 299         /// To resolve macros properly the texts get their DocIterator.
 300         /// Every macro definition is stored with its DocIterator
 301         /// as well. Only those macros with a smaller iterator become
 302         /// visible in a paragraph.
 303         DocIterator macrocontextPosition() const;
 304         ///
 305         void setMacrocontextPosition(DocIterator const & pos);
 306
 307         ///
 308         bool completionSupported(Cursor const & cur) const;
 309         ///
 310         CompletionList const * createCompletionList(Cursor const & cur) const;
 311         ///
 312         bool insertCompletion(Cursor & cur, docstring const & s, bool /*finished*/);
 313         ///
 314         docstring completionPrefix(Cursor const & cur) const;
 315         /// for the environments
 316         pit_type depthHook(pit_type par, depth_type depth) const;
 317         ///
 318         pit_type outerHook(pit_type par) const;
 319         /// Is it the first par with same depth and layout?
 320         bool isFirstInSequence(pit_type par) const;
 321         /// Get the font of the "environment" of paragraph \p par_offset in \p pars.
 322         /// All font changes of the paragraph are relative to this font.
 323         Font const outerFont(pit_type par_offset) const;
 324
 325 private:
 326         /// The InsetText owner shall have access to everything.
 327         friend class InsetText;
 328
 329         /// return past-the-last paragraph influenced by a layout
 330         /// change on pit
 331         pit_type undoSpan(pit_type pit);
 332
 333         // fix the cursor `cur' after a characters has been deleted at `where'
 334         // position. Called by deleteEmptyParagraphMechanism
 335         static void fixCursorAfterDelete(CursorSlice & cur, CursorSlice const & where);
 336
 337         // At cursor position 0, try to merge the paragraph with the one before it.
 338         // Ignore change tracking, i.e., physically remove the end-of-par character
 339         bool backspacePos0(Cursor & cur);
 340         /// handle the case where bibitems were deleted
 341         bool handleBibitems(Cursor & cur);
 342         /// are we in a list item (description etc.)?
 343         bool inDescriptionItem(Cursor & cur) const;
 344         ///
 345         void charInserted(Cursor & cur);
 346         /// set 'number' font property
 347         void number(Cursor & cur);
 348
 349         /// paste plain text at current cursor.
 350         /// \param str string to paste
 351         /// \param asParagraphs whether to paste as paragraphs or as lines
 352         void pasteString(Cursor & cur, docstring const & str,
 353                         bool asParagraphs);
 354         ///
 355         void readParToken(Paragraph & par, Lexer & lex, std::string const & token,
 356                 Font & font, Change & change, ErrorList & errorList);
 357         ///
 358         void readParagraph(Paragraph & par, Lexer & lex, ErrorList & errorList);
 359         /// Set Label Width string to all paragraphs of the same layout
 360     /// and depth in a sequence.
 361         void setLabelWidthStringToSequence(pit_type const par_offset, docstring const & s);
 362
 363         /// Owner Inset.
 364         InsetText * owner_;
 365         ///
 366         ParagraphList pars_;
 367         ///
 368         bool autoBreakRows_;
 369         /// position of the text in the buffer.
 370         DocIterator macrocontext_position_;
 371         ///
 372         unsigned int undo_counter_;
 373 };
 374
 375
 376 ///
 377 void breakParagraphConservative(BufferParams const & bparams,
 378                                 ParagraphList & paragraphs,
 379                                 pit_type par,
 380                                 pos_type pos);
 381
 382 /**
 383  * Append the next paragraph onto the tail of this one.
 384  * Be careful, this doesent make any check at all.
 385  */
 386 void mergeParagraph(BufferParams const & bparams,
 387         ParagraphList & paragraphs, pit_type par);
 388
 389 /// accept the changes within the complete ParagraphList
 390 void acceptChanges(ParagraphList & pars, BufferParams const & bparams);
 391
 392 } // namespace lyx
 393
 394 #endif // TEXT_H