docs/latex/wx/text.tex

   1 %%%%%%%%%%%%%%%%%%%%%%%%%%%% wxTextAttr %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   2
   3 \section{\class{wxTextAttr}}\label{wxtextattr}
   4
   5 wxTextAttr represents the attributes, or style, for a range of text in a\rtfsp
   6 \helpref{wxTextCtrl}{wxtextctrl}.
   7
   8 \wxheading{Derived from}
   9
  10 No base class
  11
  12 \wxheading{Include files}
  13
  14 <wx/textctrl.h>
  15
  16 \latexignore{\rtfignore{\wxheading{Members}}}
  17
  18 \membersection{wxTextAttr::wxTextAttr}\label{wxtextattrctor}
  19
  20 \func{}{wxTextAttr}{\void}
  21
  22 \func{}{wxTextAttr}{\param{const wxColour\& }{colText}, \param{const wxColour\& }{colBack = wxNullColour}, \param{const wxFont\& }{font = wxNullFont}}
  23
  24 The constructors initialize one or more of the text foreground and background
  25 colours and font. The values not initialized in the constructor can be set
  26 later, otherwise \helpref{wxTextCtrl::SetStyle}{wxtextctrlsetstyle} will use
  27 the default values for them.
  28
  29 \membersection{wxTextAttr::GetBackgroundColour}
  30
  31 \constfunc{const wxColour\&}{GetBackgroundColour}{\void}
  32
  33 Return the background colour specified by this attribute.
  34
  35 \membersection{wxTextAttr::GetFont}
  36
  37 \constfunc{const wxFont\&}{GetFont}{\void}
  38
  39 Return the text font specified by this attribute.
  40
  41 \membersection{wxTextAttr::GetTextColour}
  42
  43 \constfunc{const wxColour\&}{GetTextColour}{\void}
  44
  45 Return the text colour specified by this attribute.
  46
  47 \membersection{wxTextAttr::HasBackgroundColour}
  48
  49 \constfunc{bool}{HasBackgroundColour}{\void}
  50
  51 Returns {\tt TRUE} if this style specifies the background colour to use.
  52
  53 \membersection{wxTextAttr::HasFont}
  54
  55 \constfunc{bool}{HasFont}{\void}
  56
  57 Returns {\tt TRUE} if this style specifies the font to use.
  58
  59 \membersection{wxTextAttr::HasTextColour}
  60
  61 \constfunc{bool}{HasTextColour}{\void}
  62
  63 Returns {\tt TRUE} if this style specifies the foreground colour to use.
  64
  65 \membersection{wxTextAttr::IsDefault}
  66
  67 \constfunc{bool}{IsDefault}{\void}
  68
  69 Returns {\tt TRUE} if this style specifies any non-default attributes.
  70
  71 %%%%%%%%%%%%%%%%%%%%%%%%%%%% wxTextCtrl %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  72
  73 \section{\class{wxTextCtrl}}\label{wxtextctrl}
  74
  75 A text control allows text to be displayed and edited. It may be
  76 single line or multi-line.
  77
  78 \wxheading{Derived from}
  79
  80 streambuf\\
  81 \helpref{wxControl}{wxcontrol}\\
  82 \helpref{wxWindow}{wxwindow}\\
  83 \helpref{wxEvtHandler}{wxevthandler}\\
  84 \helpref{wxObject}{wxobject}
  85
  86 \wxheading{Include files}
  87
  88 <wx/textctrl.h>
  89
  90 \wxheading{Window styles}
  91
  92 \twocolwidtha{5cm}
  93 \begin{twocollist}\itemsep=0pt
  94 \twocolitem{\windowstyle{wxTE\_PROCESS\_ENTER}}{The control will generate
  95 the message wxEVENT\_TYPE\_TEXT\_ENTER\_COMMAND (otherwise pressing <Enter> is
  96 either processed internally by the control or used for navigation between
  97 dialog controls).}
  98 \twocolitem{\windowstyle{wxTE\_PROCESS\_TAB}}{The control will receieve
  99 EVT\_CHAR messages for TAB pressed - normally, TAB is used for passing to the
 100 next control in a dialog instead. For the control created with this style,
 101 you can still use Ctrl-Enter to pass to the next control from the keyboard.}
 102 \twocolitem{\windowstyle{wxTE\_MULTILINE}}{The text control allows multiple lines.}
 103 \twocolitem{\windowstyle{wxTE\_PASSWORD}}{The text will be echoed as asterisks.}
 104 \twocolitem{\windowstyle{wxTE\_READONLY}}{The text will not be user-editable.}
 105 \twocolitem{\windowstyle{wxTE\_RICH}}{Use rich text control under Win32, this
 106 allows to have more than 64Kb of text in the control even under Win9x. This
 107 style is ignored under other platforms.}
 108 \twocolitem{\windowstyle{wxTE\_RICH2}}{Use rich text control version 2.0 or 3.0
 109 under Win32, this style is ignored under other platforms}
 110 \twocolitem{\windowstyle{wxTE\_AUTO\_URL}}{Highlight the URLs and generate the
 111 wxTextUrlEvents when mouse events occur over them. This style is supported
 112 under Win32 only and requires wxTE\_RICH.}
 113 \twocolitem{\windowstyle{wxTE\_NOHIDESEL}}{By default, the Windows text control
 114 doesn't show the selection when it doesn't have focus - use this style to force
 115 it to always show it. It doesn't do anything under other platforms.}
 116 \twocolitem{\windowstyle{wxHSCROLL}}{A horizontal scrollbar will be created. No effect under GTK+.}
 117 \twocolitem{\windowstyle{wxTE\_DONTWRAP}}{Same as {\tt wxHSCROLL} style.}
 118 \twocolitem{\windowstyle{wxTE\_LINEWRAP}}{Wrap the lines too long to be shown entirely at any position (wxUniv only currently)}
 119 \twocolitem{\windowstyle{wxTE\_WORDWRAP}}{Wrap the lines too long to be shown entirely at word boundaries only (wxUniv only currently)}
 120 \end{twocollist}
 121
 122 See also \helpref{window styles overview}{windowstyles} and
 123 \helpref{wxTextCtrl::wxTextCtrl}{wxtextctrlconstr}.
 124
 125 \wxheading{wxTextCtrl styles}
 126
 127 Multi-line text controls support the styles, i.e. provide a possibility to set
 128 colours and font for individual characters in it (note that under Windows {\tt
 129 wxTE\_RICH} style is required for style support). To use the styles you can
 130 either call \helpref{SetDefaultStyle}{wxtextctrlsetdefaultstyle} before
 131 inserting the text or call \helpref{SetStyle}{wxtextctrlsetstyle} later to
 132 change the style of the text already in the control (the first solution is
 133 much more efficient).
 134
 135 In either case, if the style doesn't specify some of the attributes (for
 136 example you only want to set the text colour but without changing the font nor
 137 the text background), the values of the default style will be used for them.
 138 If there is no default style, the attributes of the text control itself are
 139 used.
 140
 141 So the following code correctly describes what it does: the second call
 142 to \helpref{SetDefaultStyle}{wxtextctrlsetdefaultstyle} doesn't change the
 143 text foreground colour (which stays red) while the last one doesn't change the
 144 background colour (which stays grey):
 145
 146 {\small%
 147 \begin{verbatim}
 148     text->SetDefaultStyle(wxTextAttr(*wxRED));
 149     text->AppendText("Red text\n");
 150     text->SetDefaultStyle(wxTextAttr(wxNullColour, *wxLIGHT_GREY));
 151     text->AppendText("Red on grey text\n");
 152     text->SetDefaultStyle(wxTextAttr(*wxBLUE);
 153     text->AppendText("Blue on grey text\n");
 154 \end{verbatim}
 155 }%
 156
 157 \wxheading{wxTextCtrl and C++ streams}
 158
 159 This class multiply-inherits from {\bf streambuf} where compilers allow,
 160 allowing code such as the following:
 161
 162 {\small%
 163 \begin{verbatim}
 164   wxTextCtrl *control = new wxTextCtrl(...);
 165
 166   ostream stream(control)
 167
 168   stream << 123.456 << " some text\n";
 169   stream.flush();
 170 \end{verbatim}
 171 }%
 172
 173 If your compiler does not support derivation from {\bf streambuf} and gives a
 174 compile error, define the symbol {\bf NO\_TEXT\_WINDOW\_STREAM} in the
 175 wxTextCtrl header file.
 176
 177 Note that independently of this setting you can always use wxTextCtrl itself
 178 in a stream-like manner:
 179
 180 {\small%
 181 \begin{verbatim}
 182   wxTextCtrl *control = new wxTextCtrl(...);
 183
 184   *control << 123.456 << " some text\n";
 185 \end{verbatim}
 186 }%
 187
 188 always works. However the possibility to create an ostream associated with
 189 wxTextCtrl may be useful if you need to redirect the output of a function
 190 taking an ostream as parameter to a text control.
 191
 192 Another commonly requested need is to redirect {\bf std::cout} to the text
 193 control. This could be done in the following way:
 194
 195 {\small%
 196 \begin{verbatim}
 197   #include <iostream>
 198
 199   wxTextCtrl *control = new wxTextCtrl(...);
 200
 201   std::streambuf *sbOld = std::cout.rdbuf();
 202   std::cout.rdbuf(*control);
 203
 204   // use cout as usual, the output appears in the text control
 205   ...
 206
 207   std::cout.rdbuf(sbOld);
 208 \end{verbatim}
 209 }%
 210
 211 But wxWindows provides a convenient class to make it even simpler so instead
 212 you may just do
 213
 214 {\small%
 215 \begin{verbatim}
 216   #include <iostream>
 217
 218   wxTextCtrl *control = new wxTextCtrl(...);
 219
 220   wxStreamToTextRedirector redirect(control);
 221
 222   // all output to cout goes into the text control until the exit from current
 223   // scope
 224 \end{verbatim}
 225 }%
 226
 227 See \helpref{wxStreamToTextRedirector}{wxstreamtotextredirector} for more
 228 details.
 229
 230 \wxheading{Event handling}
 231
 232 The following commands are processed by default event handlers in wxTextCtrl: wxID\_CUT, wxID\_COPY,
 233 wxID\_PASTE, wxID\_UNDO, wxID\_REDO. The associated UI update events are also processed
 234 automatically, when the control has the focus.
 235
 236 To process input from a text control, use these event handler macros to direct input to member
 237 functions that take a \helpref{wxCommandEvent}{wxcommandevent} argument.
 238
 239 \twocolwidtha{7cm}%
 240 \begin{twocollist}\itemsep=0pt
 241 \twocolitem{{\bf EVT\_TEXT(id, func)}}{Respond to a wxEVT\_COMMAND\_TEXT\_UPDATED event,
 242 generated when the text changes. Notice that this event will always be sent
 243 when the text controls contents changes - whether this is due to user input or
 244 comes from the program itself (for example, if SetValue() is called)}
 245 \twocolitem{{\bf EVT\_TEXT\_ENTER(id, func)}}{Respond to a wxEVT\_COMMAND\_TEXT\_ENTER event,
 246 generated when enter is pressed in a single-line text control.}
 247 \twocolitem{{\bf EVT\_TEXT\_URL(id, func)}}{A mouse event occured over an URL
 248 in the text control (Win32 only)}
 249 \twocolitem{{\bf EVT\_TEXT\_MAXLEN(id, func)}}{User tried to enter more text
 250 into the control than the limit set by
 251 \helpref{SetMaxLength}{wxtextctrlsetmaxlength}.}
 252 \end{twocollist}%
 253
 254 \latexignore{\rtfignore{\wxheading{Members}}}
 255
 256 \membersection{wxTextCtrl::wxTextCtrl}\label{wxtextctrlconstr}
 257
 258 \func{}{wxTextCtrl}{\void}
 259
 260 Default constructor.
 261
 262 \func{}{wxTextCtrl}{\param{wxWindow* }{parent}, \param{wxWindowID}{ id},\rtfsp
 263 \param{const wxString\& }{value = ``"}, \param{const wxPoint\& }{pos = wxDefaultPosition}, \param{const wxSize\& }{size = wxDefaultSize},\rtfsp
 264 \param{long}{ style = 0}, \param{const wxValidator\& }{validator = wxDefaultValidator}, \param{const wxString\& }{name = wxTextCtrlNameStr}}
 265
 266 Constructor, creating and showing a text control.
 267
 268 \wxheading{Parameters}
 269
 270 \docparam{parent}{Parent window. Should not be NULL.}
 271
 272 \docparam{id}{Control identifier. A value of -1 denotes a default value.}
 273
 274 \docparam{value}{Default text value.}
 275
 276 \docparam{pos}{Text control position.}
 277
 278 \docparam{size}{Text control size.}
 279
 280 \docparam{style}{Window style. See \helpref{wxTextCtrl}{wxtextctrl}.}
 281
 282 \docparam{validator}{Window validator.}
 283
 284 \docparam{name}{Window name.}
 285
 286 \wxheading{Remarks}
 287
 288 The horizontal scrollbar ({\bf wxHSCROLL} style flag) will only be created
 289 for multi-line text controls.
 290 Without a horizontal scrollbar, text lines that don't fit in the control's
 291 size will be wrapped (but no newline character is inserted). Single line
 292 controls don't have a horizontal scrollbar, the text is automatically scrolled
 293 so that the \helpref{insertion point}{wxtextctrlgetinsertionpoint} is always
 294 visible.
 295
 296 % VZ: this is no longer true
 297 %Under Windows, if the {\bf wxTE\_MULTILINE} style is used, the window is implemented
 298 %as a Windows rich text control with unlimited capacity. Otherwise, normal edit control limits
 299 %apply.
 300
 301 \wxheading{See also}
 302
 303 \helpref{wxTextCtrl::Create}{wxtextctrlcreate}, \helpref{wxValidator}{wxvalidator}
 304
 305 \membersection{wxTextCtrl::\destruct{wxTextCtrl}}
 306
 307 \func{}{\destruct{wxTextCtrl}}{\void}
 308
 309 Destructor, destroying the text control.
 310
 311 \membersection{wxTextCtrl::AppendText}\label{wxtextctrlappendtext}
 312
 313 \func{void}{AppendText}{\param{const wxString\& }{ text}}
 314
 315 Appends the text to the end of the text control.
 316
 317 \wxheading{Parameters}
 318
 319 \docparam{text}{Text to write to the text control.}
 320
 321 \wxheading{Remarks}
 322
 323 After the text is appended, the insertion point will be at the end of the text control. If this behaviour is not desired,
 324 the programmer should use \helpref{GetInsertionPoint}{wxtextctrlgetinsertionpoint} and \helpref{SetInsertionPoint}{wxtextctrlsetinsertionpoint}.
 325
 326 \wxheading{See also}
 327
 328 \helpref{wxTextCtrl::WriteText}{wxtextctrlwritetext}
 329
 330 \membersection{wxTextCtrl::CanCopy}\label{wxtextctrlcancopy}
 331
 332 \func{virtual bool}{CanCopy}{\void}
 333
 334 Returns {\tt TRUE} if the selection can be copied to the clipboard.
 335
 336 \membersection{wxTextCtrl::CanCut}\label{wxtextctrlcancut}
 337
 338 \func{virtual bool}{CanCut}{\void}
 339
 340 Returns {\tt TRUE} if the selection can be cut to the clipboard.
 341
 342 \membersection{wxTextCtrl::CanPaste}\label{wxtextctrlcanpaste}
 343
 344 \func{virtual bool}{CanPaste}{\void}
 345
 346 Returns {\tt TRUE} if the contents of the clipboard can be pasted into the
 347 text control. On some platforms (Motif, GTK) this is an approximation
 348 and returns {\tt TRUE} if the control is editable, {\tt FALSE} otherwise.
 349
 350 \membersection{wxTextCtrl::CanRedo}\label{wxtextctrlcanredo}
 351
 352 \func{virtual bool}{CanRedo}{\void}
 353
 354 Returns {\tt TRUE} if there is a redo facility available and the last operation
 355 can be redone.
 356
 357 \membersection{wxTextCtrl::CanUndo}\label{wxtextctrlcanundo}
 358
 359 \func{virtual bool}{CanUndo}{\void}
 360
 361 Returns {\tt TRUE} if there is an undo facility available and the last operation
 362 can be undone.
 363
 364 \membersection{wxTextCtrl::Clear}\label{wxtextctrlclear}
 365
 366 \func{virtual void}{Clear}{\void}
 367
 368 Clears the text in the control.
 369
 370 \membersection{wxTextCtrl::Copy}\label{wxtextctrlcopy}
 371
 372 \func{virtual void}{Copy}{\void}
 373
 374 Copies the selected text to the clipboard under Motif and MS Windows.
 375
 376 \membersection{wxTextCtrl::Create}\label{wxtextctrlcreate}
 377
 378 \func{bool}{Create}{\param{wxWindow* }{parent}, \param{wxWindowID}{ id},\rtfsp
 379 \param{const wxString\& }{value = ``"}, \param{const wxPoint\& }{pos = wxDefaultPosition}, \param{const wxSize\& }{size = wxDefaultSize},\rtfsp
 380 \param{long}{ style = 0}, \param{const wxValidator\& }{validator = wxDefaultValidator}, \param{const wxString\& }{name = wxTextCtrlNameStr}}
 381
 382 Creates the text control for two-step construction. Derived classes
 383 should call or replace this function. See \helpref{wxTextCtrl::wxTextCtrl}{wxtextctrlconstr}\rtfsp
 384 for further details.
 385
 386 \membersection{wxTextCtrl::Cut}\label{wxtextctrlcut}
 387
 388 \func{virtual void}{Cut}{\void}
 389
 390 Copies the selected text to the clipboard and removes the selection.
 391
 392 \membersection{wxTextCtrl::DiscardEdits}
 393
 394 \func{void}{DiscardEdits}{\void}
 395
 396 Resets the internal `modified' flag as if the current edits had been saved.
 397
 398 \membersection{wxTextCtrl::GetDefaultStyle}\label{wxtextctrlgetdefaultstyle}
 399
 400 \constfunc{const wxTextAttr\& }{GetDefaultStyle}{\void}
 401
 402 Returns the style currently used for the new text.
 403
 404 \wxheading{See also}
 405
 406 \helpref{SetDefaultStyle}{wxtextctrlsetdefaultstyle}
 407
 408 \membersection{wxTextCtrl::GetInsertionPoint}\label{wxtextctrlgetinsertionpoint}
 409
 410 \constfunc{virtual long}{GetInsertionPoint}{\void}
 411
 412 Returns the insertion point. This is defined as the zero based index of the
 413 character position to the right of the insertion point. For example, if
 414 the insertion point is at the end of the text control, it is equal to
 415 both \helpref{GetValue()}{wxtextctrlgetvalue}.Length() and
 416 \helpref{GetLastPosition()}{wxtextctrlgetlastposition}.
 417
 418 The following code snippet safely returns the character at the insertion
 419 point or the zero character if the point is at the end of the control.
 420
 421 {\small%
 422 \begin{verbatim}
 423   char GetCurrentChar(wxTextCtrl *tc) {
 424     if (tc->GetInsertionPoint() == tc->GetLastPosition())
 425       return '\0';
 426     return tc->GetValue[tc->GetInsertionPoint()];
 427   }
 428 \end{verbatim}
 429 }%
 430
 431 \membersection{wxTextCtrl::GetLastPosition}\label{wxtextctrlgetlastposition}
 432
 433 \constfunc{virtual long}{GetLastPosition}{\void}
 434
 435 Returns the zero based index of the last position in the text control,
 436 which is equal to the number of characters in the control.
 437
 438 \membersection{wxTextCtrl::GetLineLength}\label{wxtextctrlgetlinelength}
 439
 440 \constfunc{int}{GetLineLength}{\param{long}{ lineNo}}
 441
 442 Gets the length of the specified line, not including any trailing newline
 443 character(s).
 444
 445 \wxheading{Parameters}
 446
 447 \docparam{lineNo}{Line number (starting from zero).}
 448
 449 \wxheading{Return value}
 450
 451 The length of the line, or -1 if {\it lineNo} was invalid.
 452
 453 \membersection{wxTextCtrl::GetLineText}\label{wxtextctrlgetlinetext}
 454
 455 \constfunc{wxString}{GetLineText}{\param{long}{ lineNo}}
 456
 457 Returns the contents of a given line in the text control, not including
 458 any trailing newline character(s).
 459
 460 \wxheading{Parameters}
 461
 462 \docparam{lineNo}{The line number, starting from zero.}
 463
 464 \wxheading{Return value}
 465
 466 The contents of the line.
 467
 468 \membersection{wxTextCtrl::GetNumberOfLines}\label{wxtextctrlgetnumberoflines}
 469
 470 \constfunc{int}{GetNumberOfLines}{\void}
 471
 472 Returns the number of lines in the text control buffer.
 473
 474 \wxheading{Remarks}
 475
 476 Note that even empty text controls have one line (where the insertion point
 477 is), so GetNumberOfLines() never returns 0.
 478
 479 For gtk\_text (multi-line) controls, the number of lines is
 480 calculated by actually counting newline characters in the buffer. You
 481 may wish to avoid using functions that work with line numbers if you are
 482 working with controls that contain large amounts of text.
 483
 484 \membersection{wxTextCtrl::GetRange}\label{wxtextctrlgetrange}
 485
 486 \constfunc{virtual wxString}{GetRange}{\param{long}{ from}, \param{long}{ to}}
 487
 488 Returns the string containing the text staring in the positions {\it from} and
 489 up to {\it to} in the control. The positions must have been returned by another
 490 wxTextCtrl method.
 491
 492 Please note that the positions in a multiline wxTextCtrl do {\bf not}
 493 correspond to the indices in the string returned by
 494 \helpref{GetValue}{wxtextctrlgetvalue} because of the different new line
 495 representations ({\tt CR} or {\tt CR LF}) and so this method should be used to
 496 obtain the correct results instead of extracting parts of the entire value. It
 497 may also be more efficient, especially if the control contains a lot of data.
 498
 499 \membersection{wxTextCtrl::GetSelection}\label{wxtextctrlgetselection}
 500
 501 \constfunc{virtual void}{GetSelection}{\param{long*}{ from}, \param{long*}{ to}}
 502
 503 Gets the current selection span. If the returned values are equal, there was
 504 no selection.
 505
 506 Please note that the indices returned may be used with the other wxTextctrl
 507 methods but don't necessarily represent the correct indices into the string
 508 returned by \helpref{GetValue()}{wxtextctrlgetvalue} for multiline controls
 509 under Windows (at least,) you should use
 510 \helpref{GetStringSelection()}{wxtextctrlgetstringselection} to get the selected
 511 text.
 512
 513 \wxheading{Parameters}
 514
 515 \docparam{from}{The returned first position.}
 516
 517 \docparam{to}{The returned last position.}
 518
 519 \pythonnote{The wxPython version of this method returns a tuple
 520 consisting of the from and to values.}
 521
 522 \perlnote{In wxPerl this method takes no parameter and returns a
 523 2-element list {\tt ( from, to )}.}
 524
 525 \membersection{wxTextCtrl::GetStringSelection}\label{wxtextctrlgetstringselection}
 526
 527 \func{virtual wxString}{GetStringSelection}{\void}
 528
 529 Gets the text currently selected in the control. If there is no selection, the
 530 returned string is empty.
 531
 532 \membersection{wxTextCtrl::GetValue}\label{wxtextctrlgetvalue}
 533
 534 \constfunc{wxString}{GetValue}{\void}
 535
 536 Gets the contents of the control. Notice that for a multiline text control,
 537 the lines will be separated by (Unix-style) $\backslash$n characters, even under
 538 Windows where they are separated by a $\backslash$r$\backslash$n sequence in the native control.
 539
 540 \membersection{wxTextCtrl::IsModified}\label{wxtextctrlismodified}
 541
 542 \constfunc{bool}{IsModified}{\void}
 543
 544 Returns {\tt TRUE} if the text has been modified by user. Note that calling
 545 \helpref{SetValue}{wxtextctrlsetvalue} doesn't make the control modified.
 546
 547 \membersection{wxTextCtrl::LoadFile}\label{wxtextctrlloadfile}
 548
 549 \func{bool}{LoadFile}{\param{const wxString\& }{ filename}}
 550
 551 Loads and displays the named file, if it exists.
 552
 553 \wxheading{Parameters}
 554
 555 \docparam{filename}{The filename of the file to load.}
 556
 557 \wxheading{Return value}
 558
 559 {\tt TRUE} if successful, {\tt FALSE} otherwise.
 560
 561 \membersection{wxTextCtrl::OnChar}\label{wxtextctrlonchar}
 562
 563 \func{void}{OnChar}{\param{wxKeyEvent\& }{event}}
 564
 565 Default handler for character input.
 566
 567 \wxheading{Remarks}
 568
 569 It is possible to intercept character
 570 input by overriding this member. Call this function
 571 to let the default behaviour take place; not calling
 572 it results in the character being ignored. You can
 573 replace the {\it keyCode} member of {\it event} to
 574 translate keystrokes.
 575
 576 Note that Windows and Motif have different ways
 577 of implementing the default behaviour. In Windows,
 578 calling wxTextCtrl::OnChar immediately
 579 processes the character. In Motif,
 580 calling this function simply sets a flag
 581 to let default processing happen. This might affect
 582 the way in which you write your OnChar function
 583 on different platforms.
 584
 585 \wxheading{See also}
 586
 587 \helpref{wxKeyEvent}{wxkeyevent}
 588
 589 \membersection{wxTextCtrl::OnDropFiles}\label{wxtextctrlondropfiles}
 590
 591 \func{void}{OnDropFiles}{\param{wxDropFilesEvent\& }{event}}
 592
 593 This event handler function implements default drag and drop behaviour, which
 594 is to load the first dropped file into the control.
 595
 596 \wxheading{Parameters}
 597
 598 \docparam{event}{The drop files event.}
 599
 600 \wxheading{Remarks}
 601
 602 This is not implemented on non-Windows platforms.
 603
 604 \wxheading{See also}
 605
 606 \helpref{wxDropFilesEvent}{wxdropfilesevent}
 607
 608 \membersection{wxTextCtrl::Paste}\label{wxtextctrlpaste}
 609
 610 \func{virtual void}{Paste}{\void}
 611
 612 Pastes text from the clipboard to the text item.
 613
 614 \membersection{wxTextCtrl::PositionToXY}\label{wxtextctrlpositiontoxy}
 615
 616 \constfunc{bool}{PositionToXY}{\param{long }{pos}, \param{long *}{x}, \param{long *}{y}}
 617
 618 Converts given position to a zero-based column, line number pair.
 619
 620 \wxheading{Parameters}
 621
 622 \docparam{pos}{Position.}
 623
 624 \docparam{x}{Receives zero based column number.}
 625
 626 \docparam{y}{Receives zero based line number.}
 627
 628 \wxheading{Return value}
 629
 630 {\tt TRUE} on success, {\tt FALSE} on failure (most likely due to a too large position
 631 parameter).
 632
 633 \wxheading{See also}
 634
 635 \helpref{wxTextCtrl::XYToPosition}{wxtextctrlxytoposition}
 636
 637 \pythonnote{In Python, PositionToXY() returns a tuple containing the x and
 638 y values, so (x,y) = PositionToXY() is equivalent to the call described
 639 above.}
 640
 641 \perlnote{In wxPerl this method only takes the {\tt pos} parameter, and
 642 returns a 2-element list {\tt ( x, y )}.}
 643
 644 \membersection{wxTextCtrl::Redo}\label{wxtextctrlredo}
 645
 646 \func{virtual void}{Redo}{\void}
 647
 648 If there is a redo facility and the last operation can be redone, redoes the last operation. Does nothing
 649 if there is no redo facility.
 650
 651 \membersection{wxTextCtrl::Remove}\label{wxtextctrlremove}
 652
 653 \func{virtual void}{Remove}{\param{long}{ from}, \param{long}{ to}}
 654
 655 Removes the text starting at the first given position up to (but not including)
 656 the character at the last position.
 657
 658 \wxheading{Parameters}
 659
 660 \docparam{from}{The first position.}
 661
 662 \docparam{to}{The last position.}
 663
 664 \membersection{wxTextCtrl::Replace}\label{wxtextctrlreplace}
 665
 666 \func{virtual void}{Replace}{\param{long}{ from}, \param{long}{ to}, \param{const wxString\& }{value}}
 667
 668 Replaces the text starting at the first position up to (but not including)
 669 the character at the last position with the given text.
 670
 671 \wxheading{Parameters}
 672
 673 \docparam{from}{The first position.}
 674
 675 \docparam{to}{The last position.}
 676
 677 \docparam{value}{The value to replace the existing text with.}
 678
 679 \membersection{wxTextCtrl::SaveFile}\label{wxtextctrlsavefile}
 680
 681 \func{bool}{SaveFile}{\param{const wxString\& }{ filename}}
 682
 683 Saves the contents of the control in a text file.
 684
 685 \wxheading{Parameters}
 686
 687 \docparam{filename}{The name of the file in which to save the text.}
 688
 689 \wxheading{Return value}
 690
 691 {\tt TRUE} if the operation was successful, {\tt FALSE} otherwise.
 692
 693 \membersection{wxTextCtrl::SetDefaultStyle}\label{wxtextctrlsetdefaultstyle}
 694
 695 \func{bool}{SetDefaultStyle}{\param{const wxTextAttr\& }{style}}
 696
 697 Changes the default style to use for the new text which is going to be added
 698 to the control using \helpref{WriteText}{wxtextctrlwritetext} or\rtfsp
 699 \helpref{AppendText}{wxtextctrlappendtext}.
 700
 701 If either of the font, foreground, or background colour is not set in\rtfsp
 702 {\it style}, the values of the previous default style are used for them. If
 703 the previous default style didn't set them neither, the global font or colours
 704 of the text control itself are used as fall back.
 705
 706 However if the {\it style} parameter is the default wxTextAttr, then the
 707 default style is just reset (instead of being combined with the new style which
 708 wouldn't change it at all).
 709
 710 \wxheading{Parameters}
 711
 712 \docparam{style}{The style for the new text.}
 713
 714 \wxheading{Return value}
 715
 716 {\tt TRUE} on success, {\tt FALSE} if an error occured - may also mean that
 717 the styles are not supported under this platform.
 718
 719 \wxheading{See also}
 720
 721 \helpref{GetDefaultStyle}{wxtextctrlgetdefaultstyle}
 722
 723 \membersection{wxTextCtrl::SetEditable}\label{wxtextctrlseteditable}
 724
 725 \func{virtual void}{SetEditable}{\param{const bool}{ editable}}
 726
 727 Makes the text item editable or read-only, overriding the {\bf wxTE\_READONLY} flag.
 728
 729 \wxheading{Parameters}
 730
 731 \docparam{editable}{If {\tt TRUE}, the control is editable. If {\tt FALSE}, the control is read-only.}
 732
 733 \membersection{wxTextCtrl::SetInsertionPoint}\label{wxtextctrlsetinsertionpoint}
 734
 735 \func{virtual void}{SetInsertionPoint}{\param{long}{ pos}}
 736
 737 Sets the insertion point at the given position.
 738
 739 \wxheading{Parameters}
 740
 741 \docparam{pos}{Position to set.}
 742
 743 \membersection{wxTextCtrl::SetInsertionPointEnd}\label{wxtextctrlsetinsertionpointend}
 744
 745 \func{virtual void}{SetInsertionPointEnd}{\void}
 746
 747 Sets the insertion point at the end of the text control. This is equivalent
 748 to \helpref{SetInsertionPoint}{wxtextctrlsetinsertionpoint}(\helpref{GetLastPosition}{wxtextctrlgetlastposition}()).
 749
 750 \membersection{wxTextCtrl::SetMaxLength}\label{wxtextctrlsetmaxlength}
 751
 752 \func{virtual void}{SetMaxLength}{\param{unsigned long }{len}}
 753
 754 This function sets the maximum number of characters the user can enter into the
 755 control. In other words, it allows to limit the text value length to {\it len}
 756 not counting the terminating {\tt NUL} character.
 757
 758 If {\it len} is $0$, the previously set max length limi, if any, is discarded
 759 and the user may enter as much text as the underlying native text control
 760 widget supports (typically at least 32Kb).
 761
 762 If the user tries to enter more characters into the text control when it
 763 already is filled up to the maximal length, a
 764 {\tt wxEVT\_COMMAND\_TEXT\_MAXLEN} event is sent to notify the program about it
 765 (giving it the possibility to show an explanatory message, for example) and the
 766 extra input is discarded.
 767
 768 Note that this function may only be used with single line text controls.
 769
 770 \wxheading{Compatibility}
 771
 772 Only implemented in wxMSW/wxGTK starting with wxWindows 2.3.2.
 773
 774 \membersection{wxTextCtrl::SetSelection}\label{wxtextctrlsetselection}
 775
 776 \func{virtual void}{SetSelection}{\param{long}{ from}, \param{long}{ to}}
 777
 778 Selects the text starting at the first position up to (but not including) the character at the last position.
 779
 780 \wxheading{Parameters}
 781
 782 \docparam{from}{The first position.}
 783
 784 \docparam{to}{The last position.}
 785
 786 \membersection{wxTextCtrl::SetStyle}\label{wxtextctrlsetstyle}
 787
 788 \func{bool}{SetStyle}{\param{long }{start}, \param{long }{end}, \param{const wxTextAttr\& }{style}}
 789
 790 Changes the style of the selection. If either of the font, foreground, or
 791 background colour is not set in {\it style}, the values of\rtfsp
 792 \helpref{GetDefaultStyle()}{wxtextctrlgetdefaultstyle} are used.
 793
 794 \wxheading{Parameters}
 795
 796 \docparam{start}{The start of selection to change.}
 797
 798 \docparam{end}{The end of selection to change.}
 799
 800 \docparam{style}{The new style for the selection.}
 801
 802 \wxheading{Return value}
 803
 804 {\tt TRUE} on success, {\tt FALSE} if an error occured - may also mean that
 805 the styles are not supported under this platform.
 806
 807 \membersection{wxTextCtrl::SetValue}\label{wxtextctrlsetvalue}
 808
 809 \func{virtual void}{SetValue}{\param{const wxString\& }{ value}}
 810
 811 Sets the text value and marks the control as not-modified (which means that
 812 \helpref{IsModified}{wxtextctrlismodified} would return {\tt FALSE} immediately
 813 after the call to SetValue).
 814
 815 \wxheading{Parameters}
 816
 817 \docparam{value}{The new value to set. It may contain newline characters if the text control is multi-line.}
 818
 819 \membersection{wxTextCtrl::ShowPosition}\label{wxtextctrlshowposition}
 820
 821 \func{void}{ShowPosition}{\param{long}{ pos}}
 822
 823 Makes the line containing the given position visible.
 824
 825 \wxheading{Parameters}
 826
 827 \docparam{pos}{The position that should be visible.}
 828
 829 \membersection{wxTextCtrl::Undo}\label{wxtextctrlundo}
 830
 831 \func{virtual void}{Undo}{\void}
 832
 833 If there is an undo facility and the last operation can be undone, undoes the last operation. Does nothing
 834 if there is no undo facility.
 835
 836 \membersection{wxTextCtrl::WriteText}\label{wxtextctrlwritetext}
 837
 838 \func{void}{WriteText}{\param{const wxString\& }{ text}}
 839
 840 Writes the text into the text control at the current insertion position.
 841
 842 \wxheading{Parameters}
 843
 844 \docparam{text}{Text to write to the text control.}
 845
 846 \wxheading{Remarks}
 847
 848 Newlines in the text string
 849 are the only control characters allowed, and they will cause appropriate
 850 line breaks.  See \helpref{wxTextCtrl::\cinsert}{wxtextctrlinsert} and \helpref{wxTextCtrl::AppendText}{wxtextctrlappendtext} for more convenient ways of writing to the window.
 851
 852 After the write operation, the insertion point will be at the end of the inserted text, so subsequent write operations will be appended. To append text after the user may have interacted with the control, call \helpref{wxTextCtrl::SetInsertionPointEnd}{wxtextctrlsetinsertionpointend} before writing.
 853
 854 \membersection{wxTextCtrl::XYToPosition}\label{wxtextctrlxytoposition}
 855
 856 \func{long}{XYToPosition}{\param{long}{ x}, \param{long}{ y}}
 857
 858 Converts the given zero based column and line number to a position.
 859
 860 \wxheading{Parameters}
 861
 862 \docparam{x}{The column number.}
 863
 864 \docparam{y}{The line number.}
 865
 866 \wxheading{Return value}
 867
 868 The position value.
 869
 870 \membersection{wxTextCtrl::operator \cinsert}\label{wxtextctrlinsert}
 871
 872 \func{wxTextCtrl\&}{operator \cinsert}{\param{const wxString\& }{s}}
 873
 874 \func{wxTextCtrl\&}{operator \cinsert}{\param{int}{ i}}
 875
 876 \func{wxTextCtrl\&}{operator \cinsert}{\param{long}{ i}}
 877
 878 \func{wxTextCtrl\&}{operator \cinsert}{\param{float}{ f}}
 879
 880 \func{wxTextCtrl\&}{operator \cinsert}{\param{double}{ d}}
 881
 882 \func{wxTextCtrl\&}{operator \cinsert}{\param{char}{ c}}
 883
 884 Operator definitions for appending to a text control, for example:
 885
 886 \begin{verbatim}
 887   wxTextCtrl *wnd = new wxTextCtrl(my_frame);
 888
 889   (*wnd) << "Welcome to text control number " << 1 << ".\n";
 890 \end{verbatim}
 891