src/Cursor.h

   1 // -*- C++ -*-
   2 /**
   3  * \file Cursor.h
   4  * This file is part of LyX, the document processor.
   5  * Licence details can be found in the file COPYING.
   6  *
   7  * \author André Pönitz
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #ifndef LCURSOR_H
  13 #define LCURSOR_H
  14
  15 #include "DispatchResult.h"
  16 #include "DocIterator.h"
  17 #include "Font.h"
  18 #include "Undo.h"
  19
  20 #include "mathed/MathParser_flags.h"
  21
  22 #include <vector>
  23
  24
  25 namespace lyx {
  26
  27 class Buffer;
  28 class BufferView;
  29 class FuncStatus;
  30 class FuncRequest;
  31 class Row;
  32
  33 // these should go
  34 class InsetMathUnknown;
  35 class Encoding;
  36
  37
  38 /// The cursor class describes the position of a cursor within a document.
  39
  40 // The public inheritance should go in favour of a suitable data member
  41 // (or maybe private inheritance) at some point of time.
  42 class Cursor : public DocIterator
  43 {
  44 public:
  45         /// create the cursor of a BufferView
  46         explicit Cursor(BufferView & bv);
  47
  48         /// dispatch from innermost inset upwards
  49         void dispatch(FuncRequest const & cmd);
  50         /// get the resut of the last dispatch
  51         DispatchResult result() const;
  52         /// add a new cursor slice
  53         void push(Inset & inset);
  54         /// add a new cursor slice, place cursor at front (move backwards)
  55         void pushBackward(Inset & inset);
  56         /// pop one level off the cursor
  57         void pop();
  58         /// pop one slice off the cursor stack and go backwards
  59         bool popBackward();
  60         /// pop one slice off the cursor stack and go forward
  61         bool popForward();
  62         /// make sure we are outside of given inset
  63         void leaveInset(Inset const & inset);
  64         /// sets cursor part
  65         void setCursor(DocIterator const & it);
  66         /// sets the cursor to the anchor
  67         void setCursorToAnchor();
  68
  69         ///
  70         void setCurrentFont();
  71
  72         //
  73         // selection
  74         //
  75         /// selection active?
  76         bool selection() const { return selection_; }
  77         /// set selection;
  78         void setSelection(bool sel) { selection_ = sel; }
  79         /// do we have a multicell selection?
  80         bool selIsMultiCell() const
  81                 { return selection_ && selBegin().idx() != selEnd().idx(); }
  82         /// do we have a multiline selection?
  83         bool selIsMultiLine() const
  84                 { return selection_ && selBegin().pit() != selEnd().pit(); }
  85         /// did we place the anchor?
  86         bool mark() const { return mark_; }
  87         /// did we place the anchor?
  88         void setMark(bool mark) { mark_ = mark; }
  89         ///
  90         void setSelection();
  91         /// set selection at given position
  92         void setSelection(DocIterator const & where, int n);
  93         ///
  94         void clearSelection();
  95         /// access start of selection
  96         CursorSlice selBegin() const;
  97         /// access end of selection
  98         CursorSlice selEnd() const;
  99         /// access start of selection
 100         DocIterator selectionBegin() const;
 101         /// access start of selection
 102         DocIterator selectionEnd() const;
 103         /**
 104          * Update the selection status and save permanent
 105          * selection if needed.
 106          * @param selecting the new selection status
 107          * @return whether the selection status has changed
 108          */
 109         bool selHandle(bool selecting);
 110         ///
 111         docstring selectionAsString(bool label) const;
 112         ///
 113         docstring currentState() const;
 114
 115         /// auto-correct mode
 116         bool autocorrect() const { return autocorrect_; }
 117         /// auto-correct mode
 118         bool & autocorrect() { return autocorrect_; }
 119         /// are we entering a macro name?
 120         bool macromode() const { return macromode_; }
 121         /// are we entering a macro name?
 122         bool & macromode() { return macromode_; }
 123         /// returns x,y position
 124         void getPos(int & x, int & y) const;
 125         /// return logical positions between which the cursor is situated
 126         /**
 127          * If the cursor is at the edge of a row, the position which is "over the
 128          * edge" will be returned as -1.
 129          */
 130         void getSurroundingPos(pos_type & left_pos, pos_type & right_pos);
 131         /// the row in the paragraph we're in
 132         Row const & textRow() const;
 133
 134         //
 135         // common part
 136         //
 137         /// move one step backwards
 138         bool posBackward();
 139         /// move one step forward
 140         bool posForward();
 141         /// move visually one step to the right
 142         /**
 143          * @note: This method may move into an inset unless skip_inset == true.
 144          * @note: This method may move into a new paragraph.
 145          * @note: This method may move out of the current slice.
 146          * @return: true if moved, false if not moved
 147          */
 148         bool posVisRight(bool skip_inset = false);
 149         /// move visually one step to the left
 150         /**
 151          * @note: This method may move into an inset unless skip_inset == true.
 152          * @note: This method may move into a new paragraph.
 153          * @note: This method may move out of the current slice.
 154          * @return: true if moved, false if not moved
 155          */
 156         bool posVisLeft(bool skip_inset = false);
 157         /// move visually to next/previous row
 158         /**
 159          * Assuming we were to keep moving left (right) from the current cursor
 160          * position, place the cursor at the rightmost (leftmost) edge of the
 161          * new row to which we would move according to visual-mode cursor movement.
 162          * This could be either the next or the previous row, depending on the
 163          * direction in which we're moving, and whether we're in an LTR or RTL
 164          * paragraph.
 165          * @note: The new position may even be in a new paragraph.
 166          * @note: This method will not move out of the current slice.
 167          * @return: false if not moved (no more rows to move to in given direction)
 168          * @return: true if moved
 169          */
 170         bool posVisToNewRow(bool movingLeft);
 171         /// move to right or left extremity of the current row
 172         void posVisToRowExtremity(bool left);
 173
 174         /// insert an inset
 175         void insert(Inset *);
 176         /// insert a single char
 177         void insert(char_type c);
 178         /// insert a string
 179         void insert(docstring const & str);
 180
 181         /// FIXME: rename to something sensible showing difference to x_target()
 182         /// in pixels from left of screen, set to current position if unset
 183         int targetX() const;
 184         /// set the targetX to x
 185         void setTargetX(int x);
 186         /// return targetX or -1 if unset
 187         int x_target() const;
 188         /// set targetX to current position
 189         void setTargetX();
 190         /// clear targetX, i.e. set it to -1
 191         void clearTargetX();
 192         /// set offset to actual position - targetX
 193         void updateTextTargetOffset();
 194         /// distance between actual and targeted position during last up/down in text
 195         int textTargetOffset() const;
 196
 197         /// access to normalized selection anchor
 198         CursorSlice anchor() const;
 199         /// sets anchor to cursor position
 200         void resetAnchor();
 201         /// access to owning BufferView
 202         BufferView & bv() const;
 203         /// get some interesting description of top position
 204         void info(odocstream & os) const;
 205         /// are we in math mode (2), text mode (1) or unsure (0)?
 206         int currentMode();
 207         /// reset cursor bottom to the beginning of the given inset
 208         // (sort of 'chroot' environment...)
 209         void reset(Inset &);
 210         /// for spellchecking
 211         void replaceWord(std::string const & replacestring);
 212         /**
 213          * the event was not (yet) dispatched.
 214          *
 215          * Should only be called by an inset's doDispatch() method. It means:
 216          * I, the doDispatch() method of InsetFoo, hereby declare that I am
 217          * not able to handle that request and trust my parent will do the
 218          * Right Thing (even if my getStatus partner said that I can do it).
 219          * It is sort of a kludge that should be used only rarely...
 220          */
 221         void undispatched();
 222         /// the event was already dispatched
 223         void dispatched();
 224         /// Set which update should be done
 225         void updateFlags(Update::flags f);
 226         /**
 227          * don't call update() when done
 228          *
 229          * Should only be called by an inset's doDispatch() method. It means:
 230          * I handled that request and I can reassure you that the screen does
 231          * not need to be re-drawn and all entries in the coord cache stay
 232          * valid (and there are no other things to put in the coord cache).
 233          * This is a fairly rare event as well and only some optimization.
 234          * Not using noUpdate() should never be wrong.
 235          */
 236         void noUpdate();
 237         /// fix cursor in circumstances that should never happen.
 238         /// \retval true if a fix occured.
 239         bool fixIfBroken();
 240
 241         /// output
 242         friend std::ostream & operator<<(std::ostream & os, Cursor const & cur);
 243         friend LyXErr & operator<<(LyXErr & os, Cursor const & cur);
 244
 245         ///
 246         bool textUndo();
 247         ///
 248         bool textRedo();
 249
 250         /// makes sure the next operation will be stored
 251         void finishUndo() const;
 252
 253         /// open a new group of undo operations. Groups can be nested.
 254         void beginUndoGroup() const;
 255
 256         /// end the current undo group
 257         void endUndoGroup() const;
 258
 259         /// The general case: prepare undo for an arbitrary range.
 260         void recordUndo(UndoKind kind, pit_type from, pit_type to) const;
 261
 262         /// Convenience: prepare undo for the range between 'from' and cursor.
 263         void recordUndo(UndoKind kind, pit_type from) const;
 264
 265         /// Convenience: prepare undo for the single paragraph or cell
 266         /// containing the cursor
 267         void recordUndo(UndoKind kind = ATOMIC_UNDO) const;
 268
 269         /// Convenience: prepare undo for the inset containing the cursor
 270         void recordUndoInset(UndoKind kind = ATOMIC_UNDO) const;
 271
 272         /// Convenience: prepare undo for the whole buffer
 273         void recordUndoFullDocument() const;
 274
 275         /// Convenience: prepare undo for the selected paragraphs or cells
 276         void recordUndoSelection() const;
 277
 278         ///
 279         void checkBufferStructure();
 280
 281 public:
 282         ///
 283         BufferView * bv_;
 284 //private:
 285         /// the anchor position
 286         DocIterator anchor_;
 287
 288         ///
 289         DispatchResult disp_;
 290         ///
 291         DocIterator const & beforeDispatchCursor() { return beforeDispatchCursor_; }
 292
 293 private:
 294         /**
 295          * The target x position of the cursor. This is used for when
 296          * we have text like :
 297          *
 298          * blah blah blah blah| blah blah blah
 299          * blah blah blah
 300          * blah blah blah blah blah blah
 301          *
 302          * When we move onto row 3, we would like to be vertically aligned
 303          * with where we were in row 1, despite the fact that row 2 is
 304          * shorter than x()
 305          */
 306         int x_target_;
 307         /// if a x_target cannot be hit exactly in a text, put the difference here
 308         int textTargetOffset_;
 309         /// do we have a selection?
 310         bool selection_;
 311         /// are we on the way to get one?
 312         bool mark_;
 313         /// If true, we are behind the previous char, otherwise we are in front
 314         // of the next char. This only make a difference when we are in front
 315         // of a big inset spanning a whole row and computing coordinates for
 316         // displaying the cursor.
 317         bool logicalpos_;
 318         /// position before dispatch started
 319         DocIterator beforeDispatchCursor_;
 320
 321 // FIXME: make them private.
 322 public:
 323         /// the current font settings
 324         Font current_font;
 325         /// the current font
 326         Font real_current_font;
 327
 328 private:
 329
 330         //
 331         // math specific stuff that could be promoted to "global" later
 332         //
 333         /// do we allow autocorrection
 334         bool autocorrect_;
 335         /// are we entering a macro name?
 336         bool macromode_;
 337
 338
 339 ///////////////////////////////////////////////////////////////////
 340 //
 341 // The part below is the non-integrated rest of the original math
 342 // cursor. This should be either generalized for texted or moved
 343 // back to the math insets.
 344 //
 345 ///////////////////////////////////////////////////////////////////
 346
 347 public:
 348         ///
 349         void insert(MathAtom const &);
 350         ///
 351         void insert(MathData const &);
 352         /// return false for empty math insets
 353         bool erase();
 354         /// return false for empty math insets
 355         bool backspace();
 356         /// move the cursor up by sending an internal LFUN_UP
 357         /// return true if fullscreen update is needed
 358         bool up();
 359         /// move the cursor up by sending an internal LFUN_DOWN,
 360         /// return true if fullscreen update is needed
 361         bool down();
 362         /// whether the cursor is either at the first or last row
 363         bool atFirstOrLastRow(bool up);
 364         /// move up/down in a text inset, called for LFUN_UP/DOWN,
 365         /// return true if successful, updateNeeded set to true if fullscreen
 366         /// update is needed, otherwise it's not touched
 367         bool upDownInText(bool up, bool & updateNeeded);
 368         /// move up/down in math or any non text inset, call for LFUN_UP/DOWN
 369         /// return true if successful
 370         bool upDownInMath(bool up);
 371         ///
 372         void plainErase();
 373         ///
 374         void plainInsert(MathAtom const & at);
 375         ///
 376         void niceInsert(MathAtom const & at);
 377         ///
 378         void niceInsert(docstring const & str, Parse::flags f = Parse::NORMAL);
 379
 380         /// in pixels from top of screen
 381         void setScreenPos(int x, int y);
 382         /// current offset in the top cell
 383
 384         /// interpret name a name of a macro. Returns true if
 385         /// something got inserted.
 386         bool macroModeClose();
 387         /// are we currently typing the name of a macro?
 388         bool inMacroMode() const;
 389         /// get access to the macro we are currently typing
 390         InsetMathUnknown * activeMacro();
 391         /// get access to the macro we are currently typing
 392         InsetMathUnknown const * activeMacro() const;
 393
 394         /// replace selected stuff with at, placing the former
 395         // selection in given cell of atom
 396         void handleNest(MathAtom const & at, int cell = 0);
 397         ///
 398         bool isInside(Inset const *) const;
 399
 400         /// make sure cursor position is valid
 401         /// FIXME: It does a subset of fixIfBroken. Maybe merge them?
 402         void normalize();
 403         /// mark current cursor trace for redraw
 404         void touch();
 405
 406         /// hack for reveal codes
 407         void markInsert();
 408         void markErase();
 409         /// injects content of a cell into parent
 410         void pullArg();
 411         /// split font inset etc
 412         void handleFont(std::string const & font);
 413
 414         /// display a message
 415         void message(docstring const & msg) const;
 416         /// display an error message
 417         void errorMessage(docstring const & msg) const;
 418         ///
 419         docstring getPossibleLabel() const;
 420
 421         /// the name of the macro we are currently inputting
 422         docstring macroName();
 423         /// where in the curent cell does the macro name start?
 424         int macroNamePos();
 425         /// can we enter the inset?
 426         bool openable(MathAtom const &) const;
 427         ///
 428         Encoding const * getEncoding() const;
 429         /// font at cursor position
 430         Font getFont() const;
 431 };
 432
 433
 434 /**
 435  * Notifies all insets which appear in old, but not in cur. And then
 436  * notify all insets which appear in cur, but not in old.
 437  * Make sure that the cursor old is valid, i.e. all inset pointers
 438  * point to valid insets! Use Cursor::fixIfBroken if necessary.
 439  */
 440 bool notifyCursorLeavesOrEnters(Cursor const & old, Cursor & cur);
 441
 442
 443 } // namespace lyx
 444
 445 #endif // LYXLCURSOR_H