4 * This file is part of LyX, the document processor.
5 * Licence details can be found in the file COPYING.
9 * Full author contact details are available in file CREDITS.
13 First some explanation about what a Cursor really is, from local to
16 * a CursorSlice indicates the position of the cursor at local level.
17 It contains in particular:
18 * idx(): the cell that contains the cursor (for Tabular or math
19 arrays). Always 0 for 'plain' insets
20 * pit(): the index of the current paragraph (only for text)
21 * pos(): the position in the current paragraph (or in the math
23 * inset(): the inset in which the cursor is. For a InsetTabular,
24 this is the tabular itself, not the cell inset (which is an
27 * a DocIterator indicated the position of the cursor in the document.
28 It knows about the current buffer (buffer() method) and contains a
29 vector of CursorSlices that describes the nesting of insets up to the
30 point of interest. Note that operator<< has been implemented, so that
31 one can send a DocIterator to a stream to see its value. Try it, it is
32 very helpful to understand the cursor layout.
33 * when using idx/pit/pos on a DocIterator, one gets the information
34 from the inner slice (this slice can be accessed as top())
35 * inMathed() returns true when the cursor is in a math formula
36 * inTexted() returns true when the cursor is in text
37 * innerTextSlice() returns the deepest slice that is text (useful
38 when one is in a math equation and looks for the enclosing text)
40 * A CursorData is a descendant of Dociterator that contains
41 * a second DocIterator object, the anchor, that is useful when
43 * some other data that describes current selection, cursor font, etc.
45 This class is mostly used only for undo and contains the Cursor
46 elements that are not GUI-related. In LyX 2.0, Cursor was directly
47 deriving from DocIterator
49 * A Cursor is a descendant of CursorData that contains interesting
50 display-related information, in particular targetX(), the horizontal
51 position of the cursor in pixels.
57 #include "DispatchResult.h"
58 #include "DocIterator.h"
62 #include "mathed/MathParser_flags.h"
74 class InsetMathUnknown;
77 * This class describes the position of a cursor within a document,
78 * but does not contain any detail about the view. It is currently
79 * only used to save cursor position in Undo, but culd be extended to
80 * handle the methods that only need this data.
82 class CursorData : public DocIterator
88 explicit CursorData(Buffer * buffer);
90 explicit CursorData(DocIterator const & dit);
92 friend std::ostream & operator<<(std::ostream & os, CursorData const & cur);
93 friend LyXErr & operator<<(LyXErr & os, CursorData const & cur);
96 /// the anchor position
98 /// do we have a selection?
100 /// are we on the way to get one?
102 /// are we in word-selection mode? This is set when double clicking.
103 bool word_selection_;
105 // FIXME: make them protected.
107 /// the current font settings
110 Font real_current_font;
115 // math specific stuff that could be promoted to "global" later
117 /// do we allow autocorrection
119 /// are we entering a macro name?
124 /// The cursor class describes the position of a cursor within a document.
125 class Cursor : public CursorData
128 /// create the cursor of a BufferView
129 explicit Cursor(BufferView & bv);
131 /// returns true if we made a decision
132 bool getStatus(FuncRequest const & cmd, FuncStatus & flag) const;
133 /// dispatch from innermost inset upwards
134 void dispatch(FuncRequest const & cmd);
135 /// get the resut of the last dispatch
136 DispatchResult const & result() const;
137 /// add a new cursor slice
138 void push(Inset & inset);
139 /// add a new cursor slice, place cursor at front (move backwards)
140 void pushBackward(Inset & inset);
141 /// pop one level off the cursor
143 /// pop one slice off the cursor stack and go backwards
145 /// pop one slice off the cursor stack and go forward
147 /// make sure we are outside of given inset
148 void leaveInset(Inset const & inset);
149 /// set the cursor data
150 void setCursorData(CursorData const & data);
152 /// this (intentionally) does neither touch anchor nor selection status
153 void setCursor(DocIterator const & it);
154 /// set the cursor to dit normalised against the anchor, and set selection.
155 void setCursorSelectionTo(DocIterator dit);
156 /// sets the cursor to the normalized selection anchor
157 void setCursorToAnchor();
160 void setCurrentFont();
165 /// selection active?
166 bool selection() const { return selection_; }
167 /// set selection; this is lower level than (set|clear)Selection
168 void selection(bool sel) { selection_ = sel; }
169 /// do we have a multicell selection?
170 bool selIsMultiCell() const
171 { return selection_ && selBegin().idx() != selEnd().idx(); }
172 /// do we have a multiline selection?
173 bool selIsMultiLine() const
174 { return selection_ && selBegin().pit() != selEnd().pit(); }
176 void setWordSelection(bool set) { word_selection_ = set; }
178 bool wordSelection() { return word_selection_; }
179 /// did we place the anchor?
180 bool mark() const { return mark_; }
181 /// did we place the anchor?
182 void setMark(bool mark) { mark_ = mark; }
185 /// set selection at given position
186 void setSelection(DocIterator const & where, int n);
188 void clearSelection();
189 /// access start of selection
190 CursorSlice selBegin() const;
191 /// access end of selection
192 CursorSlice selEnd() const;
193 /// access start of selection
194 DocIterator selectionBegin() const;
195 /// access end of selection
196 DocIterator selectionEnd() const;
198 * Update the selection status and save permanent
199 * selection if needed.
200 * @param selecting the new selection status
201 * @return whether the selection status has changed
203 bool selHandle(bool selecting);
205 docstring selectionAsString(bool with_label) const;
207 docstring currentState(bool devel_mode) const;
209 /// auto-correct mode
210 bool autocorrect() const { return autocorrect_; }
211 /// auto-correct mode
212 bool & autocorrect() { return autocorrect_; }
213 /// are we entering a macro name?
214 bool macromode() const { return macromode_; }
215 /// are we entering a macro name?
216 bool & macromode() { return macromode_; }
218 /// returns x,y position
219 void getPos(int & x, int & y) const;
220 /// return logical positions between which the cursor is situated
222 * If the cursor is at the edge of a row, the position which is "over the
223 * edge" will be returned as -1.
225 void getSurroundingPos(pos_type & left_pos, pos_type & right_pos) const;
226 /// the row in the paragraph we're in
227 Row const & textRow() const;
232 /// move visually one step to the right
234 * @note: This method may move into an inset unless skip_inset == true.
235 * @note: This method may move into a new paragraph.
236 * @note: This method may move out of the current slice.
237 * @return: true if moved, false if not moved
239 bool posVisRight(bool skip_inset = false);
240 /// move visually one step to the left
242 * @note: This method may move into an inset unless skip_inset == true.
243 * @note: This method may move into a new paragraph.
244 * @note: This method may move out of the current slice.
245 * @return: true if moved, false if not moved
247 bool posVisLeft(bool skip_inset = false);
248 /// move visually to next/previous row
250 * Assuming we were to keep moving left (right) from the current cursor
251 * position, place the cursor at the rightmost (leftmost) edge of the
252 * new row to which we would move according to visual-mode cursor movement.
253 * This could be either the next or the previous row, depending on the
254 * direction in which we're moving, and whether we're in an LTR or RTL
256 * @note: The new position may even be in a new paragraph.
257 * @note: This method will not move out of the current slice.
258 * @return: false if not moved (no more rows to move to in given direction)
259 * @return: true if moved
261 bool posVisToNewRow(bool movingLeft);
262 /// move to right or left extremity of the current row
263 void posVisToRowExtremity(bool left);
264 /// Should interpretation of the arrow keys be reversed?
265 bool reverseDirectionNeeded() const;
268 void insert(Inset *);
269 /// insert a single char
270 void insert(char_type c);
272 void insert(docstring const & str);
274 /// FIXME: rename to something sensible showing difference to x_target()
275 /// in pixels from left of screen, set to current position if unset
277 /// set the targetX to x
278 void setTargetX(int x);
279 /// return targetX or -1 if unset
280 int x_target() const;
281 /// set targetX to current position
283 /// clear targetX, i.e. set it to -1
285 /// set offset to actual position - targetX
286 void updateTextTargetOffset();
287 /// distance between actual and targeted position during last up/down in text
288 int textTargetOffset() const;
290 /// access to normalized selection anchor
291 CursorSlice normalAnchor() const;
292 /// access to real selection anchor
293 DocIterator const & realAnchor() const { return anchor_; }
294 DocIterator & realAnchor() { return anchor_; }
295 /// sets anchor to cursor position
297 /// access to owning BufferView
298 BufferView & bv() const;
299 /// get some interesting description of top position
300 void info(odocstream & os, bool devel_mode) const;
301 /// are we in math mode (2), text mode (1) or unsure (0)?
303 /// reset cursor bottom to the beginning of the top inset
304 // (sort of 'chroot' environment...)
306 /// for spellchecking
307 void replaceWord(std::string const & replacestring);
309 * the event was not (yet) dispatched.
311 * Should only be called by an inset's doDispatch() method. It means:
312 * I, the doDispatch() method of InsetFoo, hereby declare that I am
313 * not able to handle that request and trust my parent will do the
314 * Right Thing (even if my getStatus partner said that I can do it).
315 * It is sort of a kludge that should be used only rarely...
317 void undispatched() const;
318 /// the event was already dispatched
319 void dispatched() const;
320 /// Set which screen update should be done
321 void screenUpdateFlags(Update::flags f) const;
322 /// Forces an updateBuffer() call
323 void forceBufferUpdate() const;
324 /// Removes any pending updateBuffer() call
325 void clearBufferUpdate() const;
326 /// Do we need to call updateBuffer()?
327 bool needBufferUpdate() const;
329 * don't call update() when done
331 * Should only be called by an inset's doDispatch() method. It means:
332 * I handled that request and I can reassure you that the screen does
333 * not need to be re-drawn and all entries in the coord cache stay
334 * valid (and there are no other things to put in the coord cache).
335 * This is a fairly rare event as well and only some optimization.
336 * Not using noScreenUpdate() should never be wrong.
338 void noScreenUpdate() const;
339 /// fix cursor in circumstances that should never happen.
340 /// \retval true if a fix occurred.
342 /// Repopulate the slices insets from bottom to top. Useful
343 /// for stable iterators or Undo data.
351 /// makes sure the next operation will be stored
352 void finishUndo() const;
354 /// open a new group of undo operations. Groups can be nested.
355 void beginUndoGroup() const;
357 /// end the current undo group
358 void endUndoGroup() const;
360 /// The general case: prepare undo for an arbitrary range.
361 void recordUndo(pit_type from, pit_type to) const;
363 /// Convenience: prepare undo for the range between 'from' and cursor.
364 void recordUndo(pit_type from) const;
366 /// Convenience: prepare undo for the single paragraph or cell
367 /// containing the cursor
368 void recordUndo(UndoKind kind = ATOMIC_UNDO) const;
370 /// Convenience: prepare undo for the inset containing the cursor
371 void recordUndoInset(Inset const * inset = 0) const;
373 /// Convenience: prepare undo for the whole buffer
374 void recordUndoFullBuffer() const;
376 /// Convenience: prepare undo for buffer parameters
377 void recordUndoBufferParams() const;
379 /// Convenience: prepare undo for the selected paragraphs or cells
380 void recordUndoSelection() const;
383 void checkBufferStructure();
385 /// hook for text input to maintain the "new born word"
386 void markNewWordPosition();
388 /// The position of the new born word
389 /// As the user is entering a word without leaving it
390 /// the result is not empty. When not in text mode
391 /// and after leaving the word the result is empty.
392 DocIterator newWord() const { return new_word_; }
394 /// Return true if the next or previous inset has confirmDeletion depending
395 /// on the boolean before. If there is a selection, return true if at least
396 /// one inset in the selection has confirmDeletion.
397 bool confirmDeletion(bool before = false) const;
399 /// Determine if x falls to the left or to the side of the middle of the
400 /// inset, and advance the cursor to match this position. If edit is true,
401 /// keep the cursor in front of the inset if it matter for dialogs.
402 /// Note: it does not handle RTL text yet, and is only used in math for now.
403 void moveToClosestEdge(int x, bool edit = false);
409 DocIterator const & beforeDispatchCursor() const { return beforeDispatchCursor_; }
411 void saveBeforeDispatchPosXY();
414 /// validate the "new born word" position
415 void checkNewWordPosition();
416 /// clear the "new born word" position
417 void clearNewWordPosition();
423 mutable DispatchResult disp_;
425 * The target x position of the cursor. This is used for when
426 * we have text like :
428 * blah blah blah blah| blah blah blah
430 * blah blah blah blah blah blah
432 * When we move onto row 3, we would like to be vertically aligned
433 * with where we were in row 1, despite the fact that row 2 is
437 /// if a x_target cannot be hit exactly in a text, put the difference here
438 int textTargetOffset_;
439 /// the start of the new born word
440 DocIterator new_word_;
441 /// position before dispatch started
442 DocIterator beforeDispatchCursor_;
443 /// cursor screen coordinates before dispatch started
444 int beforeDispatchPosX_;
445 int beforeDispatchPosY_;
447 ///////////////////////////////////////////////////////////////////
449 // The part below is the non-integrated rest of the original math
450 // cursor. This should be either generalized for texted or moved
451 // back to the math insets.
453 ///////////////////////////////////////////////////////////////////
457 void insert(MathAtom const &);
459 void insert(MathData const &);
460 /// return false for empty math insets
461 /// Use force to skip the confirmDeletion check.
462 bool erase(bool force = false);
463 bool backspace(bool force = false);
465 /// move the cursor up by sending an internal LFUN_UP
466 /// return true if fullscreen update is needed
468 /// move the cursor up by sending an internal LFUN_DOWN,
469 /// return true if fullscreen update is needed
471 /// whether the cursor is either at the first or last row
472 bool atFirstOrLastRow(bool up);
473 /// move up/down in a text inset, called for LFUN_UP/DOWN,
474 /// return true if successful, updateNeeded set to true if fullscreen
475 /// update is needed, otherwise it's not touched
476 bool upDownInText(bool up, bool & updateNeeded);
477 /// move up/down in math or any non text inset, call for LFUN_UP/DOWN
478 /// return true if successful
479 bool upDownInMath(bool up);
481 InsetMath & nextMath();
483 InsetMath & prevMath();
484 /// move forward in math. word: whether to skip a whole "word" (insets with
485 /// the same mathclass)
486 bool mathForward(bool word);
488 bool mathBackward(bool word);
492 void plainInsert(MathAtom const & at);
494 void niceInsert(MathAtom const & at);
495 /// return the number of inserted array items
496 int niceInsert(docstring const & str, Parse::flags f = Parse::NORMAL,
499 /// in pixels from top of screen
500 void setScreenPos(int x, int y);
501 /// current offset in the top cell
503 /// interpret name of a macro or ditch it if \c cancel is true.
504 /// Returns true if something got inserted.
505 bool macroModeClose(bool cancel = false);
506 /// are we currently typing the name of a macro?
507 bool inMacroMode() const;
508 /// get access to the macro we are currently typing
509 InsetMathUnknown * activeMacro();
510 /// get access to the macro we are currently typing
511 InsetMathUnknown const * activeMacro() const;
513 /// replace selected stuff with at, placing the former
514 // selection in given cell of atom
515 void handleNest(MathAtom const & at, int cell = 0);
517 bool isInside(Inset const *) const;
519 /// make sure cursor position is valid
520 /// FIXME: It does a subset of fixIfBroken. Maybe merge them?
522 /// mark current cursor trace for redraw
525 /// hack for reveal codes
528 /// injects content of a cell into parent
530 /// split font inset etc
531 void handleFont(std::string const & font);
533 /// display a message
534 void message(docstring const & msg) const;
535 /// display an error message
536 void errorMessage(docstring const & msg) const;
538 docstring getPossibleLabel() const;
540 /// the name of the macro we are currently inputting
541 docstring macroName();
542 /// where in the curent cell does the macro name start?
544 /// can we enter the inset?
545 bool openable(MathAtom const &) const;
546 /// font at cursor position
547 Font getFont() const;
552 * Notifies all insets which appear in \c old, but not in \c cur. And then
553 * notify all insets which appear in \c cur, but not in \c old.
554 * \returns true if cursor is now invalid, e.g. if some insets in
555 * higher cursor slices of \c old do not exist anymore. In this case
556 * it may be necessary to use Use Cursor::fixIfBroken.
558 bool notifyCursorLeavesOrEnters(Cursor const & old, Cursor & cur);
563 #endif // LYXLCURSOR_H