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
  18 #include <iosfwd>
  19 #include <vector>
  20
  21
  22 namespace lyx {
  23
  24 class Buffer;
  25 class BufferView;
  26 class FuncStatus;
  27 class FuncRequest;
  28 class Font;
  29 class Row;
  30
  31 // these should go
  32 class InsetMathUnknown;
  33 class Encoding;
  34
  35
  36 /// The cursor class describes the position of a cursor within a document.
  37
  38 // The public inheritance should go in favour of a suitable data member
  39 // (or maybe private inheritance) at some point of time.
  40 class Cursor : public DocIterator {
  41 public:
  42         /// create the cursor of a BufferView
  43         explicit Cursor(BufferView & bv);
  44
  45         /// dispatch from innermost inset upwards
  46         void dispatch(FuncRequest const & cmd);
  47         /// get the resut of the last dispatch
  48         DispatchResult result() const;
  49         /// add a new cursor slice
  50         void push(Inset & inset);
  51         /// add a new cursor slice, place cursor on left end
  52         void pushLeft(Inset & inset);
  53         /// pop one level off the cursor
  54         void pop();
  55         /// pop one slice off the cursor stack and go left
  56         bool popLeft();
  57         /// pop one slice off the cursor stack and go right
  58         bool popRight();
  59         /// make sure we are outside of given inset
  60         void leaveInset(Inset const & inset);
  61         /// sets cursor part
  62         void setCursor(DocIterator const & it);
  63
  64         //
  65         // selection
  66         //
  67         /// selection active?
  68         bool selection() const { return selection_; }
  69         /// selection active?
  70         bool & selection() { return selection_; }
  71         /// did we place the anchor?
  72         bool mark() const { return mark_; }
  73         /// did we place the anchor?
  74         bool & mark() { return mark_; }
  75         ///
  76         void setSelection();
  77         /// set selection at given position
  78         void setSelection(DocIterator const & where, int n);
  79         ///
  80         void clearSelection();
  81         /// access start of selection
  82         CursorSlice selBegin() const;
  83         /// access end of selection
  84         CursorSlice selEnd() const;
  85         /// access start of selection
  86         DocIterator selectionBegin() const;
  87         /// access start of selection
  88         DocIterator selectionEnd() const;
  89         /// FIXME: document this
  90         bool selHandle(bool selecting);
  91         ///
  92         docstring selectionAsString(bool label) const;
  93         ///
  94         docstring currentState();
  95
  96         /// auto-correct mode
  97         bool autocorrect() const { return autocorrect_; }
  98         /// auto-correct mode
  99         bool & autocorrect() { return autocorrect_; }
 100         /// are we entering a macro name?
 101         bool macromode() const { return macromode_; }
 102         /// are we entering a macro name?
 103         bool & macromode() { return macromode_; }
 104         /// returns x,y position
 105         void getPos(int & x, int & y) const;
 106         /// the row in the paragraph we're in
 107         Row const & textRow() const;
 108
 109         //
 110         // common part
 111         //
 112         /// move one step to the left
 113         bool posLeft();
 114         /// move one step to the right
 115         bool posRight();
 116
 117         /// insert an inset
 118         void insert(Inset *);
 119         /// insert a single char
 120         void insert(char_type c);
 121         /// insert a string
 122         void insert(docstring const & str);
 123
 124         /// FIXME: rename to something sensible showing difference to x_target()
 125         /// in pixels from left of screen, set to current position if unset
 126         int targetX() const;
 127         /// set the targetX to x
 128         void setTargetX(int x);
 129         /// return targetX or -1 if unset
 130         int x_target() const;
 131         /// set targetX to current position
 132         void setTargetX();
 133         /// clear targetX, i.e. set it to -1
 134         void clearTargetX();
 135         /// set offset to actual position - targetX
 136         void updateTextTargetOffset();
 137         /// distance between actual and targeted position during last up/down in text
 138         int textTargetOffset() const;
 139
 140         /// access to normalized selection anchor
 141         CursorSlice anchor() const;
 142         /// sets anchor to cursor position
 143         void resetAnchor();
 144         /// access to owning BufferView
 145         BufferView & bv() const;
 146         /// access to owning Buffer
 147         Buffer & buffer() const;
 148         /// get some interesting description of top position
 149         void info(odocstream & os) const;
 150         /// are we in math mode (2), text mode (1) or unsure (0)?
 151         int currentMode();
 152         /// reset cursor bottom to the beginning of the given inset
 153         // (sort of 'chroot' environment...)
 154         void reset(Inset &);
 155         /// for spellchecking
 156         void replaceWord(std::string const & replacestring);
 157         /**
 158          * the event was not (yet) dispatched.
 159          *
 160          * Should only be called by an inset's doDispatch() method. It means:
 161          * I, the doDispatch() method of InsetFoo, hereby declare that I am
 162          * not able to handle that request and trust my parent will do the
 163          * Right Thing (even if my getStatus partner said that I can do it).
 164          * It is sort of a kludge that should be used only rarely...
 165          */
 166         void undispatched();
 167         /// the event was already dispatched
 168         void dispatched();
 169         /// Set which update should be done
 170         void updateFlags(Update::flags f);
 171         /**
 172          * don't call update() when done
 173          *
 174          * Should only be called by an inset's doDispatch() method. It means:
 175          * I handled that request and I can reassure you that the screen does
 176          * not need to be re-drawn and all entries in the coord cache stay
 177          * valid (and there are no other things to put in the coord cache).
 178          * This is a fairly rare event as well and only some optimization.
 179          * Not using noUpdate() should never be wrong.
 180          */
 181         void noUpdate();
 182         /// fix cursor in circumstances that should never happen
 183         void fixIfBroken();
 184
 185         /// output
 186         friend std::ostream & operator<<(std::ostream & os, Cursor const & cur);
 187
 188 public:
 189         ///
 190         BufferView * bv_;
 191 //private:
 192         /// the anchor position
 193         DocIterator anchor_;
 194
 195         ///
 196         DispatchResult disp_;
 197         ///
 198         DocIterator const & beforeDispatchCursor() { return beforeDispatchCursor_; }
 199
 200 private:
 201         /**
 202          * The target x position of the cursor. This is used for when
 203          * we have text like :
 204          *
 205          * blah blah blah blah| blah blah blah
 206          * blah blah blah
 207          * blah blah blah blah blah blah
 208          *
 209          * When we move onto row 3, we would like to be vertically aligned
 210          * with where we were in row 1, despite the fact that row 2 is
 211          * shorter than x()
 212          */
 213         int x_target_;
 214         /// if a x_target cannot be hit exactly in a text, put the difference here
 215         int textTargetOffset_;
 216         /// do we have a selection?
 217         bool selection_;
 218         /// are we on the way to get one?
 219         bool mark_;
 220         /// If true, we are behind the previous char, otherwise we are in front
 221         // of the next char. This only make a difference when we are in front
 222         // of a big inset spanning a whole row and computing coordinates for
 223         // displaying the cursor.
 224         bool logicalpos_;
 225         /// x position before dispatch started
 226         int beforeDispX_;
 227         /// y position before dispatch started
 228         int beforeDispY_;
 229         /// position before dispatch started
 230         DocIterator beforeDispatchCursor_;
 231
 232 private:
 233
 234         //
 235         // math specific stuff that could be promoted to "global" later
 236         //
 237         /// do we allow autocorrection
 238         bool autocorrect_;
 239         /// are we entering a macro name?
 240         bool macromode_;
 241
 242
 243 ///////////////////////////////////////////////////////////////////
 244 //
 245 // The part below is the non-integrated rest of the original math
 246 // cursor. This should be either generalized for texted or moved
 247 // back to the math insets.
 248 //
 249 ///////////////////////////////////////////////////////////////////
 250
 251 public:
 252         ///
 253         void insert(MathAtom const &);
 254         ///
 255         void insert(MathData const &);
 256         /// return false for empty math insets
 257         bool erase();
 258         /// return false for empty math insets
 259         bool backspace();
 260         /// move the cursor up by sending an internal LFUN_UP
 261         /// return true if fullscreen update is needed
 262         bool up();
 263         /// move the cursor up by sending an internal LFUN_DOWN,
 264         /// return true if fullscreen update is needed
 265         bool down();
 266         /// move up/down in a text inset, called for LFUN_UP/DOWN,
 267         /// return true if successful, updateNeeded set to true if fullscreen
 268         /// update is needed, otherwise it's not touched
 269         bool upDownInText(bool up, bool & updateNeeded);
 270         /// move up/down in math or any non text inset, call for LFUN_UP/DOWN
 271         /// return true if successful
 272         bool upDownInMath(bool up);
 273         ///
 274         void plainErase();
 275         ///
 276         void plainInsert(MathAtom const & at);
 277         ///
 278         void niceInsert(MathAtom const & at);
 279         ///
 280         void niceInsert(docstring const & str);
 281
 282         /// in pixels from top of screen
 283         void setScreenPos(int x, int y);
 284         /// current offset in the top cell
 285
 286         /// interpret name a name of a macro. Returns true if
 287         /// something got inserted.
 288         bool macroModeClose();
 289         /// are we currently typing the name of a macro?
 290         bool inMacroMode() const;
 291         /// get access to the macro we are currently typing
 292         InsetMathUnknown * activeMacro();
 293
 294         /// replace selected stuff with at, placing the former
 295         // selection in given cell of atom
 296         void handleNest(MathAtom const & at, int cell = 0);
 297         ///
 298         bool isInside(Inset const *);
 299
 300         /// make sure cursor position is valid
 301         /// FIXME: It does a subset of fixIfBroken. Maybe merge them?
 302         void normalize();
 303         /// mark current cursor trace for redraw
 304         void touch();
 305
 306         /// hack for reveal codes
 307         void markInsert();
 308         void markErase();
 309         /// injects content of a cell into parent
 310         void pullArg();
 311         /// split font inset etc
 312         void handleFont(std::string const & font);
 313
 314         /// display a message
 315         void message(docstring const & msg) const;
 316         /// display an error message
 317         void errorMessage(docstring const & msg) const;
 318         ///
 319         docstring getPossibleLabel();
 320
 321         /// the name of the macro we are currently inputting
 322         docstring macroName();
 323         /// where in the curent cell does the macro name start?
 324         int macroNamePos();
 325         /// can we enter the inset?
 326         bool openable(MathAtom const &) const;
 327         ///
 328         Encoding const * getEncoding() const;
 329         /// font at cursor position
 330         Font getFont() const;
 331 };
 332
 333
 334 /**
 335  * Notifies all insets which appear in old, but not in cur. Make
 336  * Sure that the cursor old is valid, i.e. als inset pointer
 337  * point to valid insets! Use Cursor::fixIfBroken if necessary.
 338  */
 339 bool notifyCursorLeaves(DocIterator const & old, Cursor & cur);
 340
 341
 342 } // namespace lyx
 343
 344 #endif // LYXLCURSOR_H