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 the BufferView that owns it.
56 #include "DispatchResult.h"
57 #include "DocIterator.h"
61 #include "mathed/MathParser_flags.h"
73 class InsetMathUnknown;
76 * This class describes the position of a cursor within a document,
77 * but does not contain any detail about the view. It is currently
78 * only used to save cursor position in Undo, but culd be extended to
79 * handle the methods that only need this data.
81 class CursorData : public DocIterator
87 explicit CursorData(Buffer * buffer);
89 explicit CursorData(DocIterator const & dit);
91 friend std::ostream & operator<<(std::ostream & os, CursorData const & cur);
92 friend LyXErr & operator<<(LyXErr & os, CursorData const & cur);
94 /// reset cursor bottom to the beginning of the top inset
95 // (sort of 'chroot' environment...)
98 /// this (intentionally) does neither touch anchor nor selection status
99 void setCursor(DocIterator const & it);
100 /// set the cursor to dit normalised against the anchor, and set selection.
101 void setCursorSelectionTo(DocIterator dit);
102 /// sets the cursor to the normalized selection anchor
103 void setCursorToAnchor();
108 /// selection active?
109 bool selection() const { return selection_; }
110 /// set selection; this is lower level than (set|clear)Selection
111 void selection(bool sel) { selection_ = sel; }
112 /// do we have a multicell selection?
113 bool selIsMultiCell() const
114 { return selection_ && selBegin().idx() != selEnd().idx(); }
115 /// do we have a multiline selection?
116 bool selIsMultiLine() const
117 { return selection_ && selBegin().pit() != selEnd().pit(); }
119 void setWordSelection(bool set) { word_selection_ = set; }
121 bool wordSelection() { return word_selection_; }
122 /// did we place the anchor?
123 bool mark() const { return mark_; }
124 /// did we place the anchor?
125 void setMark(bool mark) { mark_ = mark; }
128 /// set selection at given position
129 void setSelection(DocIterator const & where, int n);
131 void clearSelection();
132 /// check whether selection contains specific type of inset
133 /// returns 0 if no selection was made
134 bool insetInSelection(InsetCode const & inset);
135 /// count occurences of specific inset type in the selection
136 /// returns 0 if no selection was made
137 int countInsetsInSelection(InsetCode const & inset);
139 /// access to normalized selection anchor
140 CursorSlice normalAnchor() const;
141 /// access to real selection anchor
142 DocIterator const & realAnchor() const { return anchor_; }
143 DocIterator & realAnchor() { return anchor_; }
144 /// sets anchor to cursor position
147 /// access start of selection
148 CursorSlice selBegin() const;
149 /// access end of selection
150 CursorSlice selEnd() const;
151 /// access start of selection
152 DocIterator selectionBegin() const;
153 /// access end of selection
154 DocIterator selectionEnd() const;
157 docstring selectionAsString(bool const with_label,
158 bool const skipdelete = false) const;
159 /// get some interesting description of top position
160 void info(odocstream & os, bool devel_mode) const;
162 docstring currentState(bool devel_mode) const;
164 /// fix cursor in circumstances that should never happen.
165 /// \retval true if a fix occurred.
167 /// Repopulate the slices insets from bottom to top. Useful
168 /// for stable iterators or Undo data.
176 /// makes sure the next operation will be stored
177 void finishUndo() const;
178 /// open a new group of undo operations. Groups can be nested.
179 void beginUndoGroup() const;
180 /// end the current undo group
181 void endUndoGroup() const;
182 /// end abruptly the current group and create a new one wih the same nesting level
183 void splitUndoGroup() const;
185 /// The general case: prepare undo for an arbitrary range.
186 void recordUndo(pit_type from, pit_type to) const;
187 /// Convenience: prepare undo for the range between 'from' and cursor.
188 void recordUndo(pit_type from) const;
189 /// Convenience: prepare undo for the single paragraph or cell
190 /// containing the cursor
191 void recordUndo(UndoKind kind = ATOMIC_UNDO) const;
192 /// Convenience: prepare undo for the inset containing the cursor
193 void recordUndoInset(Inset const * inset = nullptr) const;
194 /// Convenience: prepare undo for the whole buffer
195 void recordUndoFullBuffer() const;
196 /// Convenience: prepare undo for buffer parameters
197 void recordUndoBufferParams() const;
198 /// Convenience: prepare undo for the selected paragraphs or cells
199 void recordUndoSelection() const;
201 /// hook for text input to maintain the "new born word"
202 void markNewWordPosition();
203 /// The position of the new born word
204 /// As the user is entering a word without leaving it
205 /// the result is not empty. When not in text mode
206 /// and after leaving the word the result is empty.
207 DocIterator newWord() const { return new_word_; }
209 /// are we in math mode (2), text mode (1) or unsure (0)?
212 /// Return true if the next or previous inset has confirmDeletion depending
213 /// on the boolean before. If there is a selection, return true if at least
214 /// one inset in the selection has confirmDeletion.
215 bool confirmDeletion(bool before = false) const;
218 /// validate the "new born word" position
219 void checkNewWordPosition();
220 /// clear the "new born word" position
221 void clearNewWordPosition();
223 /// the anchor position
225 /// do we have a selection?
227 /// are we on the way to get one?
229 /// are we in word-selection mode? This is set when double clicking.
230 bool word_selection_;
232 /// the start of the new born word
233 DocIterator new_word_;
235 // math specific stuff that could be promoted to "global" later
238 // FIXME: make them private
240 /// The current font settings. This holds the settings for output.
242 /// The current display font. This holds the settings of the text
244 Font real_current_font;
248 /// The cursor class describes the position of a cursor within a document.
249 class Cursor : public CursorData
252 /// create the cursor of a BufferView
253 explicit Cursor(BufferView & bv);
255 /// add a new cursor slice
256 void push(Inset & inset);
257 /// add a new cursor slice, place cursor at front (move backwards)
258 void pushBackward(Inset & inset);
259 /// try to put cursor in inset before it in entry cell, or next one
260 /// if it is not empty, or exit the slice if there is no next one.
261 void editInsertedInset();
263 /// pop one level off the cursor
265 /// pop one slice off the cursor stack and go backwards
267 /// pop one slice off the cursor stack and go forward
269 /// set the cursor data
270 void setCursorData(CursorData const & data);
272 /// returns true if we made a decision
273 bool getStatus(FuncRequest const & cmd, FuncStatus & flag) const;
274 /// dispatch from innermost inset upwards
275 void dispatch(FuncRequest const & cmd);
276 /// display a message
277 void message(docstring const & msg) const;
278 /// display an error message
279 void errorMessage(docstring const & msg) const;
280 /// get the resut of the last dispatch
281 DispatchResult const & result() const;
283 /// Set the cursor language from current input method language
284 /* Considers first exact math with the codes used in the document,
285 * then approximate match among the same list, and finally exact
286 * or partial match with the whole list of languages.
288 void setLanguageFromInput();
289 /// Set the current font of the cursor from its location.
290 void setCurrentFont();
293 * Update the selection status and save permanent
294 * selection if needed.
295 * @param selecting the new selection status
296 * @return whether the selection status has changed
298 bool selHandle(bool selecting);
300 /// returns x,y position
301 void getPos(int & x, int & y) const;
302 /// return logical positions between which the cursor is situated
304 * If the cursor is at the edge of a row, the position which is "over the
305 * edge" will be returned as -1.
307 void getSurroundingPos(pos_type & left_pos, pos_type & right_pos) const;
308 /// the row in the paragraph we're in
309 Row const & textRow() const;
314 /// move visually one step to the right
316 * @note: This method may move into an inset unless skip_inset == true.
317 * @note: This method may move into a new paragraph.
318 * @note: This method may move out of the current slice.
319 * @return: true if moved, false if not moved
321 bool posVisRight(bool skip_inset = false);
322 /// move visually one step to the left
324 * @note: This method may move into an inset unless skip_inset == true.
325 * @note: This method may move into a new paragraph.
326 * @note: This method may move out of the current slice.
327 * @return: true if moved, false if not moved
329 bool posVisLeft(bool skip_inset = false);
330 /// move visually to next/previous row
332 * Assuming we were to keep moving left (right) from the current cursor
333 * position, place the cursor at the rightmost (leftmost) edge of the
334 * new row to which we would move according to visual-mode cursor movement.
335 * This could be either the next or the previous row, depending on the
336 * direction in which we're moving, and whether we're in an LTR or RTL
338 * @note: The new position may even be in a new paragraph.
339 * @note: This method will not move out of the current slice.
340 * @return: false if not moved (no more rows to move to in given direction)
341 * @return: true if moved
343 bool posVisToNewRow(bool movingLeft);
344 /// move to right or left extremity of the current row
345 void posVisToRowExtremity(bool left);
346 /// Should interpretation of the arrow keys be reversed?
347 bool reverseDirectionNeeded() const;
350 /// Insertion (mathed and texted)
352 /// insert a single char
353 void insert(char_type c);
355 void insert(docstring const & str);
357 void insert(Inset *);
359 /// Insertion (mathed only)
361 /// insert a math atom
362 void insert(MathAtom const &);
363 /// insert a string of atoms
364 void insert(MathData const &);
365 /// Like insert, but moves the selection inside the inset if possible
366 void niceInsert(MathAtom const & at);
367 /// return the number of inserted array items
368 /// FIXME: document properly
369 int niceInsert(docstring const & str, Parse::flags f = Parse::NORMAL,
372 /// FIXME: rename to something sensible showing difference to x_target()
373 /// in pixels from left of screen, set to current position if unset
375 /// set the targetX to x
376 void setTargetX(int x);
377 /// return targetX or -1 if unset
378 int x_target() const;
379 /// set targetX to current position
381 /// clear targetX, i.e. set it to -1
383 /// set offset to actual position - targetX
384 void updateTextTargetOffset();
385 /// distance between actual and targeted position during last up/down in text
386 int textTargetOffset() const;
388 /// access to owning BufferView
389 BufferView & bv() const;
390 /// reset cursor bottom to the beginning of the top inset
391 // (sort of 'chroot' environment...)
395 * the event was not (yet) dispatched.
397 * Should only be called by an inset's doDispatch() method. It means:
398 * I, the doDispatch() method of InsetFoo, hereby declare that I am
399 * not able to handle that request and trust my parent will do the
400 * Right Thing (even if my getStatus partner said that I can do it).
401 * It is sort of a kludge that should be used only rarely...
403 void undispatched() const;
404 /// the event was already dispatched
405 void dispatched() const;
407 /// Describe the screen update that should be done
408 void screenUpdateFlags(Update::flags f) const;
410 * Reset update flags to Update::None.
412 * Should only be called by an inset's doDispatch() method. It means:
413 * I handled that request and I can reassure you that the screen does
414 * not need to be re-drawn and all entries in the coord cache stay
415 * valid (and there are no other things to put in the coord cache).
416 * This is a fairly rare event as well and only some optimization.
417 * Not using noScreenUpdate() should never be wrong.
419 void noScreenUpdate() const;
421 /// Forces an updateBuffer() call
422 void forceBufferUpdate() const;
423 /// Removes any pending updateBuffer() call
424 void clearBufferUpdate() const;
425 /// Do we need to call updateBuffer()?
426 bool needBufferUpdate() const;
428 /// Repopulate the slices insets from bottom to top. Useful
429 /// for stable iterators or Undo data.
433 void checkBufferStructure();
435 /// Determine if x falls to the left or to the side of the middle of the
436 /// inset, and advance the cursor to match this position. If edit is true,
437 /// keep the cursor in front of the inset if it matter for dialogs.
438 /// Note: it does not handle RTL text yet, and is only used in math for now.
439 void moveToClosestEdge(int x, bool edit = false);
441 /// whether the cursor is either at the first or last row
442 bool atFirstOrLastRow(bool up);
448 DocIterator const & beforeDispatchCursor() const { return beforeDispatchCursor_; }
450 void saveBeforeDispatchPosXY();
456 mutable DispatchResult disp_;
458 * The target x position of the cursor. This is used for when
459 * we have text like :
461 * blah blah blah blah| blah blah blah
463 * blah blah blah blah blah blah
465 * When we move onto row 3, we would like to be vertically aligned
466 * with where we were in row 1, despite the fact that row 2 is
470 /// if a x_target cannot be hit exactly in a text, put the difference here
471 int textTargetOffset_;
472 /// position before dispatch started
473 DocIterator beforeDispatchCursor_;
474 /// cursor screen coordinates before dispatch started
475 int beforeDispatchPosX_;
476 int beforeDispatchPosY_;
478 ///////////////////////////////////////////////////////////////////
480 // The part below is the non-integrated rest of the original math
481 // cursor. This should be either generalized for texted or moved
482 // back to the math insets.
484 ///////////////////////////////////////////////////////////////////
487 /// return false for empty math insets
488 /// Use force to skip the confirmDeletion check.
489 bool erase(bool force = false);
490 bool backspace(bool force = false);
492 /// move the cursor up by sending an internal LFUN_UP
493 /// return true if fullscreen update is needed
495 /// move the cursor up by sending an internal LFUN_DOWN,
496 /// return true if fullscreen update is needed
498 /// move up/down in a text inset, called for LFUN_UP/DOWN,
499 /// return true if successful, updateNeeded set to true if fullscreen
500 /// update is needed, otherwise it's not touched
501 bool upDownInText(bool up, bool & updateNeeded);
502 /// move up/down in math or any non text inset, call for LFUN_UP/DOWN
503 /// return true if successful
504 bool upDownInMath(bool up);
505 /// move forward in math. word: whether to skip a whole "word" (insets with
506 /// the same mathclass)
507 bool mathForward(bool word);
509 bool mathBackward(bool word);
513 void plainInsert(MathAtom const & at);
515 /// interpret name of a macro or ditch it if \c cancel is true.
516 /// Returns true if something got inserted.
517 bool macroModeClose(bool cancel = false);
518 /// are we currently typing the name of a macro?
519 bool inMacroMode() const;
520 /// get access to the macro we are currently typing
521 InsetMathUnknown * activeMacro();
522 /// get access to the macro we are currently typing
523 InsetMathUnknown const * activeMacro() const;
524 /// the name of the macro we are currently inputting
525 docstring macroName();
527 /// replace selected stuff with at, placing the former
528 // selection in entry cell of atom
529 void handleNest(MathAtom const & at);
531 /// make sure cursor position is valid
532 /// FIXME: It does a subset of fixIfBroken. Maybe merge them?
535 /// injects content of a cell into parent
537 /// split font inset etc
538 void handleFont(std::string const & font);
540 /// can we enter the inset?
541 bool openable(MathAtom const &) const;
542 /// font at cursor position
543 Font getFont() const;
548 * Notifies all insets which appear in \c old, but not in \c cur. And then
549 * notify all insets which appear in \c cur, but not in \c old.
550 * \returns true if cursor is now invalid, e.g. if some insets in
551 * higher cursor slices of \c old do not exist anymore. In this case
552 * it may be necessary to use Use Cursor::fixIfBroken.
554 bool notifyCursorLeavesOrEnters(Cursor const & old, Cursor & cur);