1 :mod:`curses` --- Terminal handling for character-cell displays 2 =============================================================== 3 4 .. module:: curses 5 :synopsis: An interface to the curses library, providing portable terminal 6 handling. 7 :platform: Unix 8 .. sectionauthor:: Moshe Zadka <moshez (a] zadka.site.co.il> 9 .. sectionauthor:: Eric Raymond <esr (a] thyrsus.com> 10 11 .. versionchanged:: 1.6 12 Added support for the ``ncurses`` library and converted to a package. 13 14 The :mod:`curses` module provides an interface to the curses library, the 15 de-facto standard for portable advanced terminal handling. 16 17 While curses is most widely used in the Unix environment, versions are available 18 for DOS, OS/2, and possibly other systems as well. This extension module is 19 designed to match the API of ncurses, an open-source curses library hosted on 20 Linux and the BSD variants of Unix. 21 22 .. note:: 23 24 Since version 5.4, the ncurses library decides how to interpret non-ASCII data 25 using the ``nl_langinfo`` function. That means that you have to call 26 :func:`locale.setlocale` in the application and encode Unicode strings 27 using one of the system's available encodings. This example uses the 28 system's default encoding:: 29 30 import locale 31 locale.setlocale(locale.LC_ALL, '') 32 code = locale.getpreferredencoding() 33 34 Then use *code* as the encoding for :meth:`str.encode` calls. 35 36 .. seealso:: 37 38 Module :mod:`curses.ascii` 39 Utilities for working with ASCII characters, regardless of your locale settings. 40 41 Module :mod:`curses.panel` 42 A panel stack extension that adds depth to curses windows. 43 44 Module :mod:`curses.textpad` 45 Editable text widget for curses supporting :program:`Emacs`\ -like bindings. 46 47 :ref:`curses-howto` 48 Tutorial material on using curses with Python, by Andrew Kuchling and Eric 49 Raymond. 50 51 The :source:`Demo/curses/` directory in the Python source distribution contains 52 some example programs using the curses bindings provided by this module. 53 54 55 .. _curses-functions: 56 57 Functions 58 --------- 59 60 The module :mod:`curses` defines the following exception: 61 62 63 .. exception:: error 64 65 Exception raised when a curses library function returns an error. 66 67 .. note:: 68 69 Whenever *x* or *y* arguments to a function or a method are optional, they 70 default to the current cursor location. Whenever *attr* is optional, it defaults 71 to :const:`A_NORMAL`. 72 73 The module :mod:`curses` defines the following functions: 74 75 76 .. function:: baudrate() 77 78 Return the output speed of the terminal in bits per second. On software 79 terminal emulators it will have a fixed high value. Included for historical 80 reasons; in former times, it was used to write output loops for time delays and 81 occasionally to change interfaces depending on the line speed. 82 83 84 .. function:: beep() 85 86 Emit a short attention sound. 87 88 89 .. function:: can_change_color() 90 91 Return ``True`` or ``False``, depending on whether the programmer can change the colors 92 displayed by the terminal. 93 94 95 .. function:: cbreak() 96 97 Enter cbreak mode. In cbreak mode (sometimes called "rare" mode) normal tty 98 line buffering is turned off and characters are available to be read one by one. 99 However, unlike raw mode, special characters (interrupt, quit, suspend, and flow 100 control) retain their effects on the tty driver and calling program. Calling 101 first :func:`raw` then :func:`cbreak` leaves the terminal in cbreak mode. 102 103 104 .. function:: color_content(color_number) 105 106 Return the intensity of the red, green, and blue (RGB) components in the color 107 *color_number*, which must be between ``0`` and :const:`COLORS`. A 3-tuple is 108 returned, containing the R,G,B values for the given color, which will be between 109 ``0`` (no component) and ``1000`` (maximum amount of component). 110 111 112 .. function:: color_pair(color_number) 113 114 Return the attribute value for displaying text in the specified color. This 115 attribute value can be combined with :const:`A_STANDOUT`, :const:`A_REVERSE`, 116 and the other :const:`A_\*` attributes. :func:`pair_number` is the counterpart 117 to this function. 118 119 120 .. function:: curs_set(visibility) 121 122 Set the cursor state. *visibility* can be set to 0, 1, or 2, for invisible, 123 normal, or very visible. If the terminal supports the visibility requested, the 124 previous cursor state is returned; otherwise, an exception is raised. On many 125 terminals, the "visible" mode is an underline cursor and the "very visible" mode 126 is a block cursor. 127 128 129 .. function:: def_prog_mode() 130 131 Save the current terminal mode as the "program" mode, the mode when the running 132 program is using curses. (Its counterpart is the "shell" mode, for when the 133 program is not in curses.) Subsequent calls to :func:`reset_prog_mode` will 134 restore this mode. 135 136 137 .. function:: def_shell_mode() 138 139 Save the current terminal mode as the "shell" mode, the mode when the running 140 program is not using curses. (Its counterpart is the "program" mode, when the 141 program is using curses capabilities.) Subsequent calls to 142 :func:`reset_shell_mode` will restore this mode. 143 144 145 .. function:: delay_output(ms) 146 147 Insert an *ms* millisecond pause in output. 148 149 150 .. function:: doupdate() 151 152 Update the physical screen. The curses library keeps two data structures, one 153 representing the current physical screen contents and a virtual screen 154 representing the desired next state. The :func:`doupdate` ground updates the 155 physical screen to match the virtual screen. 156 157 The virtual screen may be updated by a :meth:`noutrefresh` call after write 158 operations such as :meth:`addstr` have been performed on a window. The normal 159 :meth:`refresh` call is simply :meth:`noutrefresh` followed by :func:`doupdate`; 160 if you have to update multiple windows, you can speed performance and perhaps 161 reduce screen flicker by issuing :meth:`noutrefresh` calls on all windows, 162 followed by a single :func:`doupdate`. 163 164 165 .. function:: echo() 166 167 Enter echo mode. In echo mode, each character input is echoed to the screen as 168 it is entered. 169 170 171 .. function:: endwin() 172 173 De-initialize the library, and return terminal to normal status. 174 175 176 .. function:: erasechar() 177 178 Return the user's current erase character. Under Unix operating systems this 179 is a property of the controlling tty of the curses program, and is not set by 180 the curses library itself. 181 182 183 .. function:: filter() 184 185 The :func:`.filter` routine, if used, must be called before :func:`initscr` is 186 called. The effect is that, during those calls, :envvar:`LINES` is set to 1; the 187 capabilities clear, cup, cud, cud1, cuu1, cuu, vpa are disabled; and the home 188 string is set to the value of cr. The effect is that the cursor is confined to 189 the current line, and so are screen updates. This may be used for enabling 190 character-at-a-time line editing without touching the rest of the screen. 191 192 193 .. function:: flash() 194 195 Flash the screen. That is, change it to reverse-video and then change it back 196 in a short interval. Some people prefer such as 'visible bell' to the audible 197 attention signal produced by :func:`beep`. 198 199 200 .. function:: flushinp() 201 202 Flush all input buffers. This throws away any typeahead that has been typed 203 by the user and has not yet been processed by the program. 204 205 206 .. function:: getmouse() 207 208 After :meth:`getch` returns :const:`KEY_MOUSE` to signal a mouse event, this 209 method should be call to retrieve the queued mouse event, represented as a 210 5-tuple ``(id, x, y, z, bstate)``. *id* is an ID value used to distinguish 211 multiple devices, and *x*, *y*, *z* are the event's coordinates. (*z* is 212 currently unused.) *bstate* is an integer value whose bits will be set to 213 indicate the type of event, and will be the bitwise OR of one or more of the 214 following constants, where *n* is the button number from 1 to 4: 215 :const:`BUTTONn_PRESSED`, :const:`BUTTONn_RELEASED`, :const:`BUTTONn_CLICKED`, 216 :const:`BUTTONn_DOUBLE_CLICKED`, :const:`BUTTONn_TRIPLE_CLICKED`, 217 :const:`BUTTON_SHIFT`, :const:`BUTTON_CTRL`, :const:`BUTTON_ALT`. 218 219 220 .. function:: getsyx() 221 222 Return the current coordinates of the virtual screen cursor in y and x. If 223 leaveok is currently true, then -1,-1 is returned. 224 225 226 .. function:: getwin(file) 227 228 Read window related data stored in the file by an earlier :func:`putwin` call. 229 The routine then creates and initializes a new window using that data, returning 230 the new window object. 231 232 233 .. function:: has_colors() 234 235 Return ``True`` if the terminal can display colors; otherwise, return ``False``. 236 237 238 .. function:: has_ic() 239 240 Return ``True`` if the terminal has insert- and delete-character capabilities. 241 This function is included for historical reasons only, as all modern software 242 terminal emulators have such capabilities. 243 244 245 .. function:: has_il() 246 247 Return ``True`` if the terminal has insert- and delete-line capabilities, or can 248 simulate them using scrolling regions. This function is included for 249 historical reasons only, as all modern software terminal emulators have such 250 capabilities. 251 252 253 .. function:: has_key(ch) 254 255 Take a key value *ch*, and return ``True`` if the current terminal type recognizes 256 a key with that value. 257 258 259 .. function:: halfdelay(tenths) 260 261 Used for half-delay mode, which is similar to cbreak mode in that characters 262 typed by the user are immediately available to the program. However, after 263 blocking for *tenths* tenths of seconds, an exception is raised if nothing has 264 been typed. The value of *tenths* must be a number between ``1`` and ``255``. Use 265 :func:`nocbreak` to leave half-delay mode. 266 267 268 .. function:: init_color(color_number, r, g, b) 269 270 Change the definition of a color, taking the number of the color to be changed 271 followed by three RGB values (for the amounts of red, green, and blue 272 components). The value of *color_number* must be between ``0`` and 273 :const:`COLORS`. Each of *r*, *g*, *b*, must be a value between ``0`` and 274 ``1000``. When :func:`init_color` is used, all occurrences of that color on the 275 screen immediately change to the new definition. This function is a no-op on 276 most terminals; it is active only if :func:`can_change_color` returns ``1``. 277 278 279 .. function:: init_pair(pair_number, fg, bg) 280 281 Change the definition of a color-pair. It takes three arguments: the number of 282 the color-pair to be changed, the foreground color number, and the background 283 color number. The value of *pair_number* must be between ``1`` and 284 ``COLOR_PAIRS - 1`` (the ``0`` color pair is wired to white on black and cannot 285 be changed). The value of *fg* and *bg* arguments must be between ``0`` and 286 :const:`COLORS`. If the color-pair was previously initialized, the screen is 287 refreshed and all occurrences of that color-pair are changed to the new 288 definition. 289 290 291 .. function:: initscr() 292 293 Initialize the library. Return a :class:`WindowObject` which represents the 294 whole screen. 295 296 .. note:: 297 298 If there is an error opening the terminal, the underlying curses library may 299 cause the interpreter to exit. 300 301 302 .. function:: is_term_resized(nlines, ncols) 303 304 Return ``True`` if :func:`resize_term` would modify the window structure, 305 ``False`` otherwise. 306 307 308 .. function:: isendwin() 309 310 Return ``True`` if :func:`endwin` has been called (that is, the curses library has 311 been deinitialized). 312 313 314 .. function:: keyname(k) 315 316 Return the name of the key numbered *k*. The name of a key generating printable 317 ASCII character is the key's character. The name of a control-key combination 318 is a two-character string consisting of a caret followed by the corresponding 319 printable ASCII character. The name of an alt-key combination (128--255) is a 320 string consisting of the prefix 'M-' followed by the name of the corresponding 321 ASCII character. 322 323 324 .. function:: killchar() 325 326 Return the user's current line kill character. Under Unix operating systems 327 this is a property of the controlling tty of the curses program, and is not set 328 by the curses library itself. 329 330 331 .. function:: longname() 332 333 Return a string containing the terminfo long name field describing the current 334 terminal. The maximum length of a verbose description is 128 characters. It is 335 defined only after the call to :func:`initscr`. 336 337 338 .. function:: meta(yes) 339 340 If *yes* is 1, allow 8-bit characters to be input. If *yes* is 0, allow only 341 7-bit chars. 342 343 344 .. function:: mouseinterval(interval) 345 346 Set the maximum time in milliseconds that can elapse between press and release 347 events in order for them to be recognized as a click, and return the previous 348 interval value. The default value is 200 msec, or one fifth of a second. 349 350 351 .. function:: mousemask(mousemask) 352 353 Set the mouse events to be reported, and return a tuple ``(availmask, 354 oldmask)``. *availmask* indicates which of the specified mouse events can be 355 reported; on complete failure it returns 0. *oldmask* is the previous value of 356 the given window's mouse event mask. If this function is never called, no mouse 357 events are ever reported. 358 359 360 .. function:: napms(ms) 361 362 Sleep for *ms* milliseconds. 363 364 365 .. function:: newpad(nlines, ncols) 366 367 Create and return a pointer to a new pad data structure with the given number 368 of lines and columns. A pad is returned as a window object. 369 370 A pad is like a window, except that it is not restricted by the screen size, and 371 is not necessarily associated with a particular part of the screen. Pads can be 372 used when a large window is needed, and only a part of the window will be on the 373 screen at one time. Automatic refreshes of pads (such as from scrolling or 374 echoing of input) do not occur. The :meth:`refresh` and :meth:`noutrefresh` 375 methods of a pad require 6 arguments to specify the part of the pad to be 376 displayed and the location on the screen to be used for the display. The 377 arguments are *pminrow*, *pmincol*, *sminrow*, *smincol*, *smaxrow*, *smaxcol*; the *p* 378 arguments refer to the upper left corner of the pad region to be displayed and 379 the *s* arguments define a clipping box on the screen within which the pad region 380 is to be displayed. 381 382 383 .. function:: newwin(nlines, ncols) 384 newwin(nlines, ncols, begin_y, begin_x) 385 386 Return a new window, whose left-upper corner is at ``(begin_y, begin_x)``, and 387 whose height/width is *nlines*/*ncols*. 388 389 By default, the window will extend from the specified position to the lower 390 right corner of the screen. 391 392 393 .. function:: nl() 394 395 Enter newline mode. This mode translates the return key into newline on input, 396 and translates newline into return and line-feed on output. Newline mode is 397 initially on. 398 399 400 .. function:: nocbreak() 401 402 Leave cbreak mode. Return to normal "cooked" mode with line buffering. 403 404 405 .. function:: noecho() 406 407 Leave echo mode. Echoing of input characters is turned off. 408 409 410 .. function:: nonl() 411 412 Leave newline mode. Disable translation of return into newline on input, and 413 disable low-level translation of newline into newline/return on output (but this 414 does not change the behavior of ``addch('\n')``, which always does the 415 equivalent of return and line feed on the virtual screen). With translation 416 off, curses can sometimes speed up vertical motion a little; also, it will be 417 able to detect the return key on input. 418 419 420 .. function:: noqiflush() 421 422 When the :func:`noqiflush` routine is used, normal flush of input and output queues 423 associated with the INTR, QUIT and SUSP characters will not be done. You may 424 want to call :func:`noqiflush` in a signal handler if you want output to 425 continue as though the interrupt had not occurred, after the handler exits. 426 427 428 .. function:: noraw() 429 430 Leave raw mode. Return to normal "cooked" mode with line buffering. 431 432 433 .. function:: pair_content(pair_number) 434 435 Return a tuple ``(fg, bg)`` containing the colors for the requested color pair. 436 The value of *pair_number* must be between ``1`` and ``COLOR_PAIRS - 1``. 437 438 439 .. function:: pair_number(attr) 440 441 Return the number of the color-pair set by the attribute value *attr*. 442 :func:`color_pair` is the counterpart to this function. 443 444 445 .. function:: putp(string) 446 447 Equivalent to ``tputs(str, 1, putchar)``; emit the value of a specified 448 terminfo capability for the current terminal. Note that the output of :func:`putp` 449 always goes to standard output. 450 451 452 .. function:: qiflush( [flag] ) 453 454 If *flag* is ``False``, the effect is the same as calling :func:`noqiflush`. If 455 *flag* is ``True``, or no argument is provided, the queues will be flushed when 456 these control characters are read. 457 458 459 .. function:: raw() 460 461 Enter raw mode. In raw mode, normal line buffering and processing of 462 interrupt, quit, suspend, and flow control keys are turned off; characters are 463 presented to curses input functions one by one. 464 465 466 .. function:: reset_prog_mode() 467 468 Restore the terminal to "program" mode, as previously saved by 469 :func:`def_prog_mode`. 470 471 472 .. function:: reset_shell_mode() 473 474 Restore the terminal to "shell" mode, as previously saved by 475 :func:`def_shell_mode`. 476 477 478 .. function:: resetty() 479 480 Restore the state of the terminal modes to what it was at the last call to 481 :func:`savetty`. 482 483 484 .. function:: resize_term(nlines, ncols) 485 486 Backend function used by :func:`resizeterm`, performing most of the work; 487 when resizing the windows, :func:`resize_term` blank-fills the areas that are 488 extended. The calling application should fill in these areas with 489 appropriate data. The :func:`resize_term` function attempts to resize all 490 windows. However, due to the calling convention of pads, it is not possible 491 to resize these without additional interaction with the application. 492 493 494 .. function:: resizeterm(nlines, ncols) 495 496 Resize the standard and current windows to the specified dimensions, and 497 adjusts other bookkeeping data used by the curses library that record the 498 window dimensions (in particular the SIGWINCH handler). 499 500 501 .. function:: savetty() 502 503 Save the current state of the terminal modes in a buffer, usable by 504 :func:`resetty`. 505 506 507 .. function:: setsyx(y, x) 508 509 Set the virtual screen cursor to *y*, *x*. If *y* and *x* are both -1, then 510 leaveok is set. 511 512 513 .. function:: setupterm([termstr, fd]) 514 515 Initialize the terminal. *termstr* is a string giving the terminal name; if 516 omitted, the value of the :envvar:`TERM` environment variable will be used. *fd* is the 517 file descriptor to which any initialization sequences will be sent; if not 518 supplied, the file descriptor for ``sys.stdout`` will be used. 519 520 521 .. function:: start_color() 522 523 Must be called if the programmer wants to use colors, and before any other color 524 manipulation routine is called. It is good practice to call this routine right 525 after :func:`initscr`. 526 527 :func:`start_color` initializes eight basic colors (black, red, green, yellow, 528 blue, magenta, cyan, and white), and two global variables in the :mod:`curses` 529 module, :const:`COLORS` and :const:`COLOR_PAIRS`, containing the maximum number 530 of colors and color-pairs the terminal can support. It also restores the colors 531 on the terminal to the values they had when the terminal was just turned on. 532 533 534 .. function:: termattrs() 535 536 Return a logical OR of all video attributes supported by the terminal. This 537 information is useful when a curses program needs complete control over the 538 appearance of the screen. 539 540 541 .. function:: termname() 542 543 Return the value of the environment variable :envvar:`TERM`, truncated to 14 characters. 544 545 546 .. function:: tigetflag(capname) 547 548 Return the value of the Boolean capability corresponding to the terminfo 549 capability name *capname*. The value ``-1`` is returned if *capname* is not a 550 Boolean capability, or ``0`` if it is canceled or absent from the terminal 551 description. 552 553 554 .. function:: tigetnum(capname) 555 556 Return the value of the numeric capability corresponding to the terminfo 557 capability name *capname*. The value ``-2`` is returned if *capname* is not a 558 numeric capability, or ``-1`` if it is canceled or absent from the terminal 559 description. 560 561 562 .. function:: tigetstr(capname) 563 564 Return the value of the string capability corresponding to the terminfo 565 capability name *capname*. ``None`` is returned if *capname* is not a string 566 capability, or is canceled or absent from the terminal description. 567 568 569 .. function:: tparm(str[,...]) 570 571 Instantiate the string *str* with the supplied parameters, where *str* should 572 be a parameterized string obtained from the terminfo database. E.g. 573 ``tparm(tigetstr("cup"), 5, 3)`` could result in ``'\033[6;4H'``, the exact 574 result depending on terminal type. 575 576 577 .. function:: typeahead(fd) 578 579 Specify that the file descriptor *fd* be used for typeahead checking. If *fd* 580 is ``-1``, then no typeahead checking is done. 581 582 The curses library does "line-breakout optimization" by looking for typeahead 583 periodically while updating the screen. If input is found, and it is coming 584 from a tty, the current update is postponed until refresh or doupdate is called 585 again, allowing faster response to commands typed in advance. This function 586 allows specifying a different file descriptor for typeahead checking. 587 588 589 .. function:: unctrl(ch) 590 591 Return a string which is a printable representation of the character *ch*. 592 Control characters are displayed as a caret followed by the character, for 593 example as ``^C``. Printing characters are left as they are. 594 595 596 .. function:: ungetch(ch) 597 598 Push *ch* so the next :meth:`getch` will return it. 599 600 .. note:: 601 602 Only one *ch* can be pushed before :meth:`getch` is called. 603 604 605 .. function:: ungetmouse(id, x, y, z, bstate) 606 607 Push a :const:`KEY_MOUSE` event onto the input queue, associating the given 608 state data with it. 609 610 611 .. function:: use_env(flag) 612 613 If used, this function should be called before :func:`initscr` or newterm are 614 called. When *flag* is ``False``, the values of lines and columns specified in the 615 terminfo database will be used, even if environment variables :envvar:`LINES` 616 and :envvar:`COLUMNS` (used by default) are set, or if curses is running in a 617 window (in which case default behavior would be to use the window size if 618 :envvar:`LINES` and :envvar:`COLUMNS` are not set). 619 620 621 .. function:: use_default_colors() 622 623 Allow use of default values for colors on terminals supporting this feature. Use 624 this to support transparency in your application. The default color is assigned 625 to the color number -1. After calling this function, ``init_pair(x, 626 curses.COLOR_RED, -1)`` initializes, for instance, color pair *x* to a red 627 foreground color on the default background. 628 629 630 .. function:: wrapper(func, ...) 631 632 Initialize curses and call another callable object, *func*, which should be the 633 rest of your curses-using application. If the application raises an exception, 634 this function will restore the terminal to a sane state before re-raising the 635 exception and generating a traceback. The callable object *func* is then passed 636 the main window 'stdscr' as its first argument, followed by any other arguments 637 passed to :func:`wrapper`. Before calling *func*, :func:`wrapper` turns on 638 cbreak mode, turns off echo, enables the terminal keypad, and initializes colors 639 if the terminal has color support. On exit (whether normally or by exception) 640 it restores cooked mode, turns on echo, and disables the terminal keypad. 641 642 643 .. _curses-window-objects: 644 645 Window Objects 646 -------------- 647 648 Window objects, as returned by :func:`initscr` and :func:`newwin` above, have 649 the following methods: 650 651 652 .. method:: window.addch(ch[, attr]) 653 window.addch(y, x, ch[, attr]) 654 655 .. note:: 656 657 A *character* means a C character (an ASCII code), rather than a Python 658 character (a string of length 1). (This note is true whenever the 659 documentation mentions a character.) The built-in :func:`ord` is handy for 660 conveying strings to codes. 661 662 Paint character *ch* at ``(y, x)`` with attributes *attr*, overwriting any 663 character previously painter at that location. By default, the character 664 position and attributes are the current settings for the window object. 665 666 .. note:: 667 668 Writing outside the window, subwindow, or pad raises a :exc:`curses.error`. 669 Attempting to write to the lower right corner of a window, subwindow, 670 or pad will cause an exception to be raised after the character is printed. 671 672 673 .. method:: window.addnstr(str, n[, attr]) 674 window.addnstr(y, x, str, n[, attr]) 675 676 Paint at most *n* characters of the string *str* at ``(y, x)`` with attributes 677 *attr*, overwriting anything previously on the display. 678 679 680 .. method:: window.addstr(str[, attr]) 681 window.addstr(y, x, str[, attr]) 682 683 Paint the string *str* at ``(y, x)`` with attributes *attr*, overwriting 684 anything previously on the display. 685 686 .. note:: 687 688 Writing outside the window, subwindow, or pad raises :exc:`curses.error`. 689 Attempting to write to the lower right corner of a window, subwindow, 690 or pad will cause an exception to be raised after the string is printed. 691 692 693 .. method:: window.attroff(attr) 694 695 Remove attribute *attr* from the "background" set applied to all writes to the 696 current window. 697 698 699 .. method:: window.attron(attr) 700 701 Add attribute *attr* from the "background" set applied to all writes to the 702 current window. 703 704 705 .. method:: window.attrset(attr) 706 707 Set the "background" set of attributes to *attr*. This set is initially 0 (no 708 attributes). 709 710 711 .. method:: window.bkgd(ch[, attr]) 712 713 Set the background property of the window to the character *ch*, with 714 attributes *attr*. The change is then applied to every character position in 715 that window: 716 717 * The attribute of every character in the window is changed to the new 718 background attribute. 719 720 * Wherever the former background character appears, it is changed to the new 721 background character. 722 723 724 .. method:: window.bkgdset(ch[, attr]) 725 726 Set the window's background. A window's background consists of a character and 727 any combination of attributes. The attribute part of the background is combined 728 (OR'ed) with all non-blank characters that are written into the window. Both 729 the character and attribute parts of the background are combined with the blank 730 characters. The background becomes a property of the character and moves with 731 the character through any scrolling and insert/delete line/character operations. 732 733 734 .. method:: window.border([ls[, rs[, ts[, bs[, tl[, tr[, bl[, br]]]]]]]]) 735 736 Draw a border around the edges of the window. Each parameter specifies the 737 character to use for a specific part of the border; see the table below for more 738 details. The characters can be specified as integers or as one-character 739 strings. 740 741 .. note:: 742 743 A ``0`` value for any parameter will cause the default character to be used for 744 that parameter. Keyword parameters can *not* be used. The defaults are listed 745 in this table: 746 747 +-----------+---------------------+-----------------------+ 748 | Parameter | Description | Default value | 749 +===========+=====================+=======================+ 750 | *ls* | Left side | :const:`ACS_VLINE` | 751 +-----------+---------------------+-----------------------+ 752 | *rs* | Right side | :const:`ACS_VLINE` | 753 +-----------+---------------------+-----------------------+ 754 | *ts* | Top | :const:`ACS_HLINE` | 755 +-----------+---------------------+-----------------------+ 756 | *bs* | Bottom | :const:`ACS_HLINE` | 757 +-----------+---------------------+-----------------------+ 758 | *tl* | Upper-left corner | :const:`ACS_ULCORNER` | 759 +-----------+---------------------+-----------------------+ 760 | *tr* | Upper-right corner | :const:`ACS_URCORNER` | 761 +-----------+---------------------+-----------------------+ 762 | *bl* | Bottom-left corner | :const:`ACS_LLCORNER` | 763 +-----------+---------------------+-----------------------+ 764 | *br* | Bottom-right corner | :const:`ACS_LRCORNER` | 765 +-----------+---------------------+-----------------------+ 766 767 768 .. method:: window.box([vertch, horch]) 769 770 Similar to :meth:`border`, but both *ls* and *rs* are *vertch* and both *ts* and 771 *bs* are *horch*. The default corner characters are always used by this function. 772 773 774 .. method:: window.chgat(attr) 775 window.chgat(num, attr) 776 window.chgat(y, x, attr) 777 window.chgat(y, x, num, attr) 778 779 Set the attributes of *num* characters at the current cursor position, or at 780 position ``(y, x)`` if supplied. If *num* is not given or is ``-1``, 781 the attribute will be set on all the characters to the end of the line. This 782 function moves cursor to position ``(y, x)`` if supplied. The changed line 783 will be touched using the :meth:`touchline` method so that the contents will 784 be redisplayed by the next window refresh. 785 786 787 .. method:: window.clear() 788 789 Like :meth:`erase`, but also cause the whole window to be repainted upon next 790 call to :meth:`refresh`. 791 792 793 .. method:: window.clearok(yes) 794 795 If *yes* is 1, the next call to :meth:`refresh` will clear the window 796 completely. 797 798 799 .. method:: window.clrtobot() 800 801 Erase from cursor to the end of the window: all lines below the cursor are 802 deleted, and then the equivalent of :meth:`clrtoeol` is performed. 803 804 805 .. method:: window.clrtoeol() 806 807 Erase from cursor to the end of the line. 808 809 810 .. method:: window.cursyncup() 811 812 Update the current cursor position of all the ancestors of the window to 813 reflect the current cursor position of the window. 814 815 816 .. method:: window.delch([y, x]) 817 818 Delete any character at ``(y, x)``. 819 820 821 .. method:: window.deleteln() 822 823 Delete the line under the cursor. All following lines are moved up by one line. 824 825 826 .. method:: window.derwin(begin_y, begin_x) 827 window.derwin(nlines, ncols, begin_y, begin_x) 828 829 An abbreviation for "derive window", :meth:`derwin` is the same as calling 830 :meth:`subwin`, except that *begin_y* and *begin_x* are relative to the origin 831 of the window, rather than relative to the entire screen. Return a window 832 object for the derived window. 833 834 835 .. method:: window.echochar(ch[, attr]) 836 837 Add character *ch* with attribute *attr*, and immediately call :meth:`refresh` 838 on the window. 839 840 841 .. method:: window.enclose(y, x) 842 843 Test whether the given pair of screen-relative character-cell coordinates are 844 enclosed by the given window, returning ``True`` or ``False``. It is useful for 845 determining what subset of the screen windows enclose the location of a mouse 846 event. 847 848 849 .. method:: window.erase() 850 851 Clear the window. 852 853 854 .. method:: window.getbegyx() 855 856 Return a tuple ``(y, x)`` of co-ordinates of upper-left corner. 857 858 859 .. method:: window.getbkgd() 860 861 Return the given window's current background character/attribute pair. 862 863 864 .. method:: window.getch([y, x]) 865 866 Get a character. Note that the integer returned does *not* have to be in ASCII 867 range: function keys, keypad keys and so on return numbers higher than 256. In 868 no-delay mode, -1 is returned if there is no input, else :func:`getch` waits 869 until a key is pressed. 870 871 872 .. method:: window.getkey([y, x]) 873 874 Get a character, returning a string instead of an integer, as :meth:`getch` 875 does. Function keys, keypad keys and so on return a multibyte string containing 876 the key name. In no-delay mode, an exception is raised if there is no input. 877 878 879 .. method:: window.getmaxyx() 880 881 Return a tuple ``(y, x)`` of the height and width of the window. 882 883 884 .. method:: window.getparyx() 885 886 Return the beginning coordinates of this window relative to its parent window 887 into two integer variables y and x. Return ``-1, -1`` if this window has no 888 parent. 889 890 891 .. method:: window.getstr([y, x]) 892 893 Read a string from the user, with primitive line editing capacity. 894 895 896 .. method:: window.getyx() 897 898 Return a tuple ``(y, x)`` of current cursor position relative to the window's 899 upper-left corner. 900 901 902 .. method:: window.hline(ch, n) 903 window.hline(y, x, ch, n) 904 905 Display a horizontal line starting at ``(y, x)`` with length *n* consisting of 906 the character *ch*. 907 908 909 .. method:: window.idcok(flag) 910 911 If *flag* is ``False``, curses no longer considers using the hardware insert/delete 912 character feature of the terminal; if *flag* is ``True``, use of character insertion 913 and deletion is enabled. When curses is first initialized, use of character 914 insert/delete is enabled by default. 915 916 917 .. method:: window.idlok(yes) 918 919 If called with *yes* equal to 1, :mod:`curses` will try and use hardware line 920 editing facilities. Otherwise, line insertion/deletion are disabled. 921 922 923 .. method:: window.immedok(flag) 924 925 If *flag* is ``True``, any change in the window image automatically causes the 926 window to be refreshed; you no longer have to call :meth:`refresh` yourself. 927 However, it may degrade performance considerably, due to repeated calls to 928 wrefresh. This option is disabled by default. 929 930 931 .. method:: window.inch([y, x]) 932 933 Return the character at the given position in the window. The bottom 8 bits are 934 the character proper, and upper bits are the attributes. 935 936 937 .. method:: window.insch(ch[, attr]) 938 window.insch(y, x, ch[, attr]) 939 940 Paint character *ch* at ``(y, x)`` with attributes *attr*, moving the line from 941 position *x* right by one character. 942 943 944 .. method:: window.insdelln(nlines) 945 946 Insert *nlines* lines into the specified window above the current line. The 947 *nlines* bottom lines are lost. For negative *nlines*, delete *nlines* lines 948 starting with the one under the cursor, and move the remaining lines up. The 949 bottom *nlines* lines are cleared. The current cursor position remains the 950 same. 951 952 953 .. method:: window.insertln() 954 955 Insert a blank line under the cursor. All following lines are moved down by one 956 line. 957 958 959 .. method:: window.insnstr(str, n[, attr]) 960 window.insnstr(y, x, str, n[, attr]) 961 962 Insert a character string (as many characters as will fit on the line) before 963 the character under the cursor, up to *n* characters. If *n* is zero or 964 negative, the entire string is inserted. All characters to the right of the 965 cursor are shifted right, with the rightmost characters on the line being lost. 966 The cursor position does not change (after moving to *y*, *x*, if specified). 967 968 969 .. method:: window.insstr(str[, attr]) 970 window.insstr(y, x, str[, attr]) 971 972 Insert a character string (as many characters as will fit on the line) before 973 the character under the cursor. All characters to the right of the cursor are 974 shifted right, with the rightmost characters on the line being lost. The cursor 975 position does not change (after moving to *y*, *x*, if specified). 976 977 978 .. method:: window.instr([n]) 979 window.instr(y, x[, n]) 980 981 Return a string of characters, extracted from the window starting at the 982 current cursor position, or at *y*, *x* if specified. Attributes are stripped 983 from the characters. If *n* is specified, :meth:`instr` returns a string 984 at most *n* characters long (exclusive of the trailing NUL). 985 986 987 .. method:: window.is_linetouched(line) 988 989 Return ``True`` if the specified line was modified since the last call to 990 :meth:`refresh`; otherwise return ``False``. Raise a :exc:`curses.error` 991 exception if *line* is not valid for the given window. 992 993 994 .. method:: window.is_wintouched() 995 996 Return ``True`` if the specified window was modified since the last call to 997 :meth:`refresh`; otherwise return ``False``. 998 999 1000 .. method:: window.keypad(yes) 1001 1002 If *yes* is 1, escape sequences generated by some keys (keypad, function keys) 1003 will be interpreted by :mod:`curses`. If *yes* is 0, escape sequences will be 1004 left as is in the input stream. 1005 1006 1007 .. method:: window.leaveok(yes) 1008 1009 If *yes* is 1, cursor is left where it is on update, instead of being at "cursor 1010 position." This reduces cursor movement where possible. If possible the cursor 1011 will be made invisible. 1012 1013 If *yes* is 0, cursor will always be at "cursor position" after an update. 1014 1015 1016 .. method:: window.move(new_y, new_x) 1017 1018 Move cursor to ``(new_y, new_x)``. 1019 1020 1021 .. method:: window.mvderwin(y, x) 1022 1023 Move the window inside its parent window. The screen-relative parameters of 1024 the window are not changed. This routine is used to display different parts of 1025 the parent window at the same physical position on the screen. 1026 1027 1028 .. method:: window.mvwin(new_y, new_x) 1029 1030 Move the window so its upper-left corner is at ``(new_y, new_x)``. 1031 1032 1033 .. method:: window.nodelay(yes) 1034 1035 If *yes* is ``1``, :meth:`getch` will be non-blocking. 1036 1037 1038 .. method:: window.notimeout(yes) 1039 1040 If *yes* is ``1``, escape sequences will not be timed out. 1041 1042 If *yes* is ``0``, after a few milliseconds, an escape sequence will not be 1043 interpreted, and will be left in the input stream as is. 1044 1045 1046 .. method:: window.noutrefresh() 1047 1048 Mark for refresh but wait. This function updates the data structure 1049 representing the desired state of the window, but does not force an update of 1050 the physical screen. To accomplish that, call :func:`doupdate`. 1051 1052 1053 .. method:: window.overlay(destwin[, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol]) 1054 1055 Overlay the window on top of *destwin*. The windows need not be the same size, 1056 only the overlapping region is copied. This copy is non-destructive, which means 1057 that the current background character does not overwrite the old contents of 1058 *destwin*. 1059 1060 To get fine-grained control over the copied region, the second form of 1061 :meth:`overlay` can be used. *sminrow* and *smincol* are the upper-left 1062 coordinates of the source window, and the other variables mark a rectangle in 1063 the destination window. 1064 1065 1066 .. method:: window.overwrite(destwin[, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol]) 1067 1068 Overwrite the window on top of *destwin*. The windows need not be the same size, 1069 in which case only the overlapping region is copied. This copy is destructive, 1070 which means that the current background character overwrites the old contents of 1071 *destwin*. 1072 1073 To get fine-grained control over the copied region, the second form of 1074 :meth:`overwrite` can be used. *sminrow* and *smincol* are the upper-left 1075 coordinates of the source window, the other variables mark a rectangle in the 1076 destination window. 1077 1078 1079 .. method:: window.putwin(file) 1080 1081 Write all data associated with the window into the provided file object. This 1082 information can be later retrieved using the :func:`getwin` function. 1083 1084 1085 .. method:: window.redrawln(beg, num) 1086 1087 Indicate that the *num* screen lines, starting at line *beg*, are corrupted and 1088 should be completely redrawn on the next :meth:`refresh` call. 1089 1090 1091 .. method:: window.redrawwin() 1092 1093 Touch the entire window, causing it to be completely redrawn on the next 1094 :meth:`refresh` call. 1095 1096 1097 .. method:: window.refresh([pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol]) 1098 1099 Update the display immediately (sync actual screen with previous 1100 drawing/deleting methods). 1101 1102 The 6 optional arguments can only be specified when the window is a pad created 1103 with :func:`newpad`. The additional parameters are needed to indicate what part 1104 of the pad and screen are involved. *pminrow* and *pmincol* specify the upper 1105 left-hand corner of the rectangle to be displayed in the pad. *sminrow*, 1106 *smincol*, *smaxrow*, and *smaxcol* specify the edges of the rectangle to be 1107 displayed on the screen. The lower right-hand corner of the rectangle to be 1108 displayed in the pad is calculated from the screen coordinates, since the 1109 rectangles must be the same size. Both rectangles must be entirely contained 1110 within their respective structures. Negative values of *pminrow*, *pmincol*, 1111 *sminrow*, or *smincol* are treated as if they were zero. 1112 1113 1114 .. method:: window.resize(nlines, ncols) 1115 1116 Reallocate storage for a curses window to adjust its dimensions to the 1117 specified values. If either dimension is larger than the current values, the 1118 window's data is filled with blanks that have the current background 1119 rendition (as set by :meth:`bkgdset`) merged into them. 1120 1121 1122 .. method:: window.scroll([lines=1]) 1123 1124 Scroll the screen or scrolling region upward by *lines* lines. 1125 1126 1127 .. method:: window.scrollok(flag) 1128 1129 Control what happens when the cursor of a window is moved off the edge of the 1130 window or scrolling region, either as a result of a newline action on the bottom 1131 line, or typing the last character of the last line. If *flag* is false, the 1132 cursor is left on the bottom line. If *flag* is true, the window is scrolled up 1133 one line. Note that in order to get the physical scrolling effect on the 1134 terminal, it is also necessary to call :meth:`idlok`. 1135 1136 1137 .. method:: window.setscrreg(top, bottom) 1138 1139 Set the scrolling region from line *top* to line *bottom*. All scrolling actions 1140 will take place in this region. 1141 1142 1143 .. method:: window.standend() 1144 1145 Turn off the standout attribute. On some terminals this has the side effect of 1146 turning off all attributes. 1147 1148 1149 .. method:: window.standout() 1150 1151 Turn on attribute *A_STANDOUT*. 1152 1153 1154 .. method:: window.subpad(begin_y, begin_x) 1155 window.subpad(nlines, ncols, begin_y, begin_x) 1156 1157 Return a sub-window, whose upper-left corner is at ``(begin_y, begin_x)``, and 1158 whose width/height is *ncols*/*nlines*. 1159 1160 1161 .. method:: window.subwin(begin_y, begin_x) 1162 window.subwin(nlines, ncols, begin_y, begin_x) 1163 1164 Return a sub-window, whose upper-left corner is at ``(begin_y, begin_x)``, and 1165 whose width/height is *ncols*/*nlines*. 1166 1167 By default, the sub-window will extend from the specified position to the lower 1168 right corner of the window. 1169 1170 1171 .. method:: window.syncdown() 1172 1173 Touch each location in the window that has been touched in any of its ancestor 1174 windows. This routine is called by :meth:`refresh`, so it should almost never 1175 be necessary to call it manually. 1176 1177 1178 .. method:: window.syncok(flag) 1179 1180 If called with *flag* set to ``True``, then :meth:`syncup` is called automatically 1181 whenever there is a change in the window. 1182 1183 1184 .. method:: window.syncup() 1185 1186 Touch all locations in ancestors of the window that have been changed in the 1187 window. 1188 1189 1190 .. method:: window.timeout(delay) 1191 1192 Set blocking or non-blocking read behavior for the window. If *delay* is 1193 negative, blocking read is used (which will wait indefinitely for input). If 1194 *delay* is zero, then non-blocking read is used, and -1 will be returned by 1195 :meth:`getch` if no input is waiting. If *delay* is positive, then 1196 :meth:`getch` will block for *delay* milliseconds, and return -1 if there is 1197 still no input at the end of that time. 1198 1199 1200 .. method:: window.touchline(start, count[, changed]) 1201 1202 Pretend *count* lines have been changed, starting with line *start*. If 1203 *changed* is supplied, it specifies whether the affected lines are marked as 1204 having been changed (*changed*\ =1) or unchanged (*changed*\ =0). 1205 1206 1207 .. method:: window.touchwin() 1208 1209 Pretend the whole window has been changed, for purposes of drawing 1210 optimizations. 1211 1212 1213 .. method:: window.untouchwin() 1214 1215 Mark all lines in the window as unchanged since the last call to 1216 :meth:`refresh`. 1217 1218 1219 .. method:: window.vline(ch, n) 1220 window.vline(y, x, ch, n) 1221 1222 Display a vertical line starting at ``(y, x)`` with length *n* consisting of the 1223 character *ch*. 1224 1225 1226 Constants 1227 --------- 1228 1229 The :mod:`curses` module defines the following data members: 1230 1231 1232 .. data:: ERR 1233 1234 Some curses routines that return an integer, such as :func:`getch`, return 1235 :const:`ERR` upon failure. 1236 1237 1238 .. data:: OK 1239 1240 Some curses routines that return an integer, such as :func:`napms`, return 1241 :const:`OK` upon success. 1242 1243 1244 .. data:: version 1245 1246 A string representing the current version of the module. Also available as 1247 :const:`__version__`. 1248 1249 Some constants are available to specify character cell attributes. 1250 The exact constants available are system dependent. 1251 1252 +------------------+-------------------------------+ 1253 | Attribute | Meaning | 1254 +==================+===============================+ 1255 | ``A_ALTCHARSET`` | Alternate character set mode | 1256 +------------------+-------------------------------+ 1257 | ``A_BLINK`` | Blink mode | 1258 +------------------+-------------------------------+ 1259 | ``A_BOLD`` | Bold mode | 1260 +------------------+-------------------------------+ 1261 | ``A_DIM`` | Dim mode | 1262 +------------------+-------------------------------+ 1263 | ``A_INVIS`` | Invisible or blank mode | 1264 +------------------+-------------------------------+ 1265 | ``A_NORMAL`` | Normal attribute | 1266 +------------------+-------------------------------+ 1267 | ``A_PROTECT`` | Protected mode | 1268 +------------------+-------------------------------+ 1269 | ``A_REVERSE`` | Reverse background and | 1270 | | foreground colors | 1271 +------------------+-------------------------------+ 1272 | ``A_STANDOUT`` | Standout mode | 1273 +------------------+-------------------------------+ 1274 | ``A_UNDERLINE`` | Underline mode | 1275 +------------------+-------------------------------+ 1276 | ``A_HORIZONTAL`` | Horizontal highlight | 1277 +------------------+-------------------------------+ 1278 | ``A_LEFT`` | Left highlight | 1279 +------------------+-------------------------------+ 1280 | ``A_LOW`` | Low highlight | 1281 +------------------+-------------------------------+ 1282 | ``A_RIGHT`` | Right highlight | 1283 +------------------+-------------------------------+ 1284 | ``A_TOP`` | Top highlight | 1285 +------------------+-------------------------------+ 1286 | ``A_VERTICAL`` | Vertical highlight | 1287 +------------------+-------------------------------+ 1288 | ``A_CHARTEXT`` | Bit-mask to extract a | 1289 | | character | 1290 +------------------+-------------------------------+ 1291 1292 Several constants are available to extract corresponding attributes returned 1293 by some methods. 1294 1295 +------------------+-------------------------------+ 1296 | Bit-mask | Meaning | 1297 +==================+===============================+ 1298 | ``A_ATTRIBUTES`` | Bit-mask to extract | 1299 | | attributes | 1300 +------------------+-------------------------------+ 1301 | ``A_CHARTEXT`` | Bit-mask to extract a | 1302 | | character | 1303 +------------------+-------------------------------+ 1304 | ``A_COLOR`` | Bit-mask to extract | 1305 | | color-pair field information | 1306 +------------------+-------------------------------+ 1307 1308 Keys are referred to by integer constants with names starting with ``KEY_``. 1309 The exact keycaps available are system dependent. 1310 1311 .. XXX this table is far too large! should it be alphabetized? 1312 1313 +-------------------+--------------------------------------------+ 1314 | Key constant | Key | 1315 +===================+============================================+ 1316 | ``KEY_MIN`` | Minimum key value | 1317 +-------------------+--------------------------------------------+ 1318 | ``KEY_BREAK`` | Break key (unreliable) | 1319 +-------------------+--------------------------------------------+ 1320 | ``KEY_DOWN`` | Down-arrow | 1321 +-------------------+--------------------------------------------+ 1322 | ``KEY_UP`` | Up-arrow | 1323 +-------------------+--------------------------------------------+ 1324 | ``KEY_LEFT`` | Left-arrow | 1325 +-------------------+--------------------------------------------+ 1326 | ``KEY_RIGHT`` | Right-arrow | 1327 +-------------------+--------------------------------------------+ 1328 | ``KEY_HOME`` | Home key (upward+left arrow) | 1329 +-------------------+--------------------------------------------+ 1330 | ``KEY_BACKSPACE`` | Backspace (unreliable) | 1331 +-------------------+--------------------------------------------+ 1332 | ``KEY_F0`` | Function keys. Up to 64 function keys are | 1333 | | supported. | 1334 +-------------------+--------------------------------------------+ 1335 | ``KEY_Fn`` | Value of function key *n* | 1336 +-------------------+--------------------------------------------+ 1337 | ``KEY_DL`` | Delete line | 1338 +-------------------+--------------------------------------------+ 1339 | ``KEY_IL`` | Insert line | 1340 +-------------------+--------------------------------------------+ 1341 | ``KEY_DC`` | Delete character | 1342 +-------------------+--------------------------------------------+ 1343 | ``KEY_IC`` | Insert char or enter insert mode | 1344 +-------------------+--------------------------------------------+ 1345 | ``KEY_EIC`` | Exit insert char mode | 1346 +-------------------+--------------------------------------------+ 1347 | ``KEY_CLEAR`` | Clear screen | 1348 +-------------------+--------------------------------------------+ 1349 | ``KEY_EOS`` | Clear to end of screen | 1350 +-------------------+--------------------------------------------+ 1351 | ``KEY_EOL`` | Clear to end of line | 1352 +-------------------+--------------------------------------------+ 1353 | ``KEY_SF`` | Scroll 1 line forward | 1354 +-------------------+--------------------------------------------+ 1355 | ``KEY_SR`` | Scroll 1 line backward (reverse) | 1356 +-------------------+--------------------------------------------+ 1357 | ``KEY_NPAGE`` | Next page | 1358 +-------------------+--------------------------------------------+ 1359 | ``KEY_PPAGE`` | Previous page | 1360 +-------------------+--------------------------------------------+ 1361 | ``KEY_STAB`` | Set tab | 1362 +-------------------+--------------------------------------------+ 1363 | ``KEY_CTAB`` | Clear tab | 1364 +-------------------+--------------------------------------------+ 1365 | ``KEY_CATAB`` | Clear all tabs | 1366 +-------------------+--------------------------------------------+ 1367 | ``KEY_ENTER`` | Enter or send (unreliable) | 1368 +-------------------+--------------------------------------------+ 1369 | ``KEY_SRESET`` | Soft (partial) reset (unreliable) | 1370 +-------------------+--------------------------------------------+ 1371 | ``KEY_RESET`` | Reset or hard reset (unreliable) | 1372 +-------------------+--------------------------------------------+ 1373 | ``KEY_PRINT`` | Print | 1374 +-------------------+--------------------------------------------+ 1375 | ``KEY_LL`` | Home down or bottom (lower left) | 1376 +-------------------+--------------------------------------------+ 1377 | ``KEY_A1`` | Upper left of keypad | 1378 +-------------------+--------------------------------------------+ 1379 | ``KEY_A3`` | Upper right of keypad | 1380 +-------------------+--------------------------------------------+ 1381 | ``KEY_B2`` | Center of keypad | 1382 +-------------------+--------------------------------------------+ 1383 | ``KEY_C1`` | Lower left of keypad | 1384 +-------------------+--------------------------------------------+ 1385 | ``KEY_C3`` | Lower right of keypad | 1386 +-------------------+--------------------------------------------+ 1387 | ``KEY_BTAB`` | Back tab | 1388 +-------------------+--------------------------------------------+ 1389 | ``KEY_BEG`` | Beg (beginning) | 1390 +-------------------+--------------------------------------------+ 1391 | ``KEY_CANCEL`` | Cancel | 1392 +-------------------+--------------------------------------------+ 1393 | ``KEY_CLOSE`` | Close | 1394 +-------------------+--------------------------------------------+ 1395 | ``KEY_COMMAND`` | Cmd (command) | 1396 +-------------------+--------------------------------------------+ 1397 | ``KEY_COPY`` | Copy | 1398 +-------------------+--------------------------------------------+ 1399 | ``KEY_CREATE`` | Create | 1400 +-------------------+--------------------------------------------+ 1401 | ``KEY_END`` | End | 1402 +-------------------+--------------------------------------------+ 1403 | ``KEY_EXIT`` | Exit | 1404 +-------------------+--------------------------------------------+ 1405 | ``KEY_FIND`` | Find | 1406 +-------------------+--------------------------------------------+ 1407 | ``KEY_HELP`` | Help | 1408 +-------------------+--------------------------------------------+ 1409 | ``KEY_MARK`` | Mark | 1410 +-------------------+--------------------------------------------+ 1411 | ``KEY_MESSAGE`` | Message | 1412 +-------------------+--------------------------------------------+ 1413 | ``KEY_MOVE`` | Move | 1414 +-------------------+--------------------------------------------+ 1415 | ``KEY_NEXT`` | Next | 1416 +-------------------+--------------------------------------------+ 1417 | ``KEY_OPEN`` | Open | 1418 +-------------------+--------------------------------------------+ 1419 | ``KEY_OPTIONS`` | Options | 1420 +-------------------+--------------------------------------------+ 1421 | ``KEY_PREVIOUS`` | Prev (previous) | 1422 +-------------------+--------------------------------------------+ 1423 | ``KEY_REDO`` | Redo | 1424 +-------------------+--------------------------------------------+ 1425 | ``KEY_REFERENCE`` | Ref (reference) | 1426 +-------------------+--------------------------------------------+ 1427 | ``KEY_REFRESH`` | Refresh | 1428 +-------------------+--------------------------------------------+ 1429 | ``KEY_REPLACE`` | Replace | 1430 +-------------------+--------------------------------------------+ 1431 | ``KEY_RESTART`` | Restart | 1432 +-------------------+--------------------------------------------+ 1433 | ``KEY_RESUME`` | Resume | 1434 +-------------------+--------------------------------------------+ 1435 | ``KEY_SAVE`` | Save | 1436 +-------------------+--------------------------------------------+ 1437 | ``KEY_SBEG`` | Shifted Beg (beginning) | 1438 +-------------------+--------------------------------------------+ 1439 | ``KEY_SCANCEL`` | Shifted Cancel | 1440 +-------------------+--------------------------------------------+ 1441 | ``KEY_SCOMMAND`` | Shifted Command | 1442 +-------------------+--------------------------------------------+ 1443 | ``KEY_SCOPY`` | Shifted Copy | 1444 +-------------------+--------------------------------------------+ 1445 | ``KEY_SCREATE`` | Shifted Create | 1446 +-------------------+--------------------------------------------+ 1447 | ``KEY_SDC`` | Shifted Delete char | 1448 +-------------------+--------------------------------------------+ 1449 | ``KEY_SDL`` | Shifted Delete line | 1450 +-------------------+--------------------------------------------+ 1451 | ``KEY_SELECT`` | Select | 1452 +-------------------+--------------------------------------------+ 1453 | ``KEY_SEND`` | Shifted End | 1454 +-------------------+--------------------------------------------+ 1455 | ``KEY_SEOL`` | Shifted Clear line | 1456 +-------------------+--------------------------------------------+ 1457 | ``KEY_SEXIT`` | Shifted Exit | 1458 +-------------------+--------------------------------------------+ 1459 | ``KEY_SFIND`` | Shifted Find | 1460 +-------------------+--------------------------------------------+ 1461 | ``KEY_SHELP`` | Shifted Help | 1462 +-------------------+--------------------------------------------+ 1463 | ``KEY_SHOME`` | Shifted Home | 1464 +-------------------+--------------------------------------------+ 1465 | ``KEY_SIC`` | Shifted Input | 1466 +-------------------+--------------------------------------------+ 1467 | ``KEY_SLEFT`` | Shifted Left arrow | 1468 +-------------------+--------------------------------------------+ 1469 | ``KEY_SMESSAGE`` | Shifted Message | 1470 +-------------------+--------------------------------------------+ 1471 | ``KEY_SMOVE`` | Shifted Move | 1472 +-------------------+--------------------------------------------+ 1473 | ``KEY_SNEXT`` | Shifted Next | 1474 +-------------------+--------------------------------------------+ 1475 | ``KEY_SOPTIONS`` | Shifted Options | 1476 +-------------------+--------------------------------------------+ 1477 | ``KEY_SPREVIOUS`` | Shifted Prev | 1478 +-------------------+--------------------------------------------+ 1479 | ``KEY_SPRINT`` | Shifted Print | 1480 +-------------------+--------------------------------------------+ 1481 | ``KEY_SREDO`` | Shifted Redo | 1482 +-------------------+--------------------------------------------+ 1483 | ``KEY_SREPLACE`` | Shifted Replace | 1484 +-------------------+--------------------------------------------+ 1485 | ``KEY_SRIGHT`` | Shifted Right arrow | 1486 +-------------------+--------------------------------------------+ 1487 | ``KEY_SRSUME`` | Shifted Resume | 1488 +-------------------+--------------------------------------------+ 1489 | ``KEY_SSAVE`` | Shifted Save | 1490 +-------------------+--------------------------------------------+ 1491 | ``KEY_SSUSPEND`` | Shifted Suspend | 1492 +-------------------+--------------------------------------------+ 1493 | ``KEY_SUNDO`` | Shifted Undo | 1494 +-------------------+--------------------------------------------+ 1495 | ``KEY_SUSPEND`` | Suspend | 1496 +-------------------+--------------------------------------------+ 1497 | ``KEY_UNDO`` | Undo | 1498 +-------------------+--------------------------------------------+ 1499 | ``KEY_MOUSE`` | Mouse event has occurred | 1500 +-------------------+--------------------------------------------+ 1501 | ``KEY_RESIZE`` | Terminal resize event | 1502 +-------------------+--------------------------------------------+ 1503 | ``KEY_MAX`` | Maximum key value | 1504 +-------------------+--------------------------------------------+ 1505 1506 On VT100s and their software emulations, such as X terminal emulators, there are 1507 normally at least four function keys (:const:`KEY_F1`, :const:`KEY_F2`, 1508 :const:`KEY_F3`, :const:`KEY_F4`) available, and the arrow keys mapped to 1509 :const:`KEY_UP`, :const:`KEY_DOWN`, :const:`KEY_LEFT` and :const:`KEY_RIGHT` in 1510 the obvious way. If your machine has a PC keyboard, it is safe to expect arrow 1511 keys and twelve function keys (older PC keyboards may have only ten function 1512 keys); also, the following keypad mappings are standard: 1513 1514 +------------------+-----------+ 1515 | Keycap | Constant | 1516 +==================+===========+ 1517 | :kbd:`Insert` | KEY_IC | 1518 +------------------+-----------+ 1519 | :kbd:`Delete` | KEY_DC | 1520 +------------------+-----------+ 1521 | :kbd:`Home` | KEY_HOME | 1522 +------------------+-----------+ 1523 | :kbd:`End` | KEY_END | 1524 +------------------+-----------+ 1525 | :kbd:`Page Up` | KEY_PPAGE | 1526 +------------------+-----------+ 1527 | :kbd:`Page Down` | KEY_NPAGE | 1528 +------------------+-----------+ 1529 1530 The following table lists characters from the alternate character set. These are 1531 inherited from the VT100 terminal, and will generally be available on software 1532 emulations such as X terminals. When there is no graphic available, curses 1533 falls back on a crude printable ASCII approximation. 1534 1535 .. note:: 1536 1537 These are available only after :func:`initscr` has been called. 1538 1539 +------------------+------------------------------------------+ 1540 | ACS code | Meaning | 1541 +==================+==========================================+ 1542 | ``ACS_BBSS`` | alternate name for upper right corner | 1543 +------------------+------------------------------------------+ 1544 | ``ACS_BLOCK`` | solid square block | 1545 +------------------+------------------------------------------+ 1546 | ``ACS_BOARD`` | board of squares | 1547 +------------------+------------------------------------------+ 1548 | ``ACS_BSBS`` | alternate name for horizontal line | 1549 +------------------+------------------------------------------+ 1550 | ``ACS_BSSB`` | alternate name for upper left corner | 1551 +------------------+------------------------------------------+ 1552 | ``ACS_BSSS`` | alternate name for top tee | 1553 +------------------+------------------------------------------+ 1554 | ``ACS_BTEE`` | bottom tee | 1555 +------------------+------------------------------------------+ 1556 | ``ACS_BULLET`` | bullet | 1557 +------------------+------------------------------------------+ 1558 | ``ACS_CKBOARD`` | checker board (stipple) | 1559 +------------------+------------------------------------------+ 1560 | ``ACS_DARROW`` | arrow pointing down | 1561 +------------------+------------------------------------------+ 1562 | ``ACS_DEGREE`` | degree symbol | 1563 +------------------+------------------------------------------+ 1564 | ``ACS_DIAMOND`` | diamond | 1565 +------------------+------------------------------------------+ 1566 | ``ACS_GEQUAL`` | greater-than-or-equal-to | 1567 +------------------+------------------------------------------+ 1568 | ``ACS_HLINE`` | horizontal line | 1569 +------------------+------------------------------------------+ 1570 | ``ACS_LANTERN`` | lantern symbol | 1571 +------------------+------------------------------------------+ 1572 | ``ACS_LARROW`` | left arrow | 1573 +------------------+------------------------------------------+ 1574 | ``ACS_LEQUAL`` | less-than-or-equal-to | 1575 +------------------+------------------------------------------+ 1576 | ``ACS_LLCORNER`` | lower left-hand corner | 1577 +------------------+------------------------------------------+ 1578 | ``ACS_LRCORNER`` | lower right-hand corner | 1579 +------------------+------------------------------------------+ 1580 | ``ACS_LTEE`` | left tee | 1581 +------------------+------------------------------------------+ 1582 | ``ACS_NEQUAL`` | not-equal sign | 1583 +------------------+------------------------------------------+ 1584 | ``ACS_PI`` | letter pi | 1585 +------------------+------------------------------------------+ 1586 | ``ACS_PLMINUS`` | plus-or-minus sign | 1587 +------------------+------------------------------------------+ 1588 | ``ACS_PLUS`` | big plus sign | 1589 +------------------+------------------------------------------+ 1590 | ``ACS_RARROW`` | right arrow | 1591 +------------------+------------------------------------------+ 1592 | ``ACS_RTEE`` | right tee | 1593 +------------------+------------------------------------------+ 1594 | ``ACS_S1`` | scan line 1 | 1595 +------------------+------------------------------------------+ 1596 | ``ACS_S3`` | scan line 3 | 1597 +------------------+------------------------------------------+ 1598 | ``ACS_S7`` | scan line 7 | 1599 +------------------+------------------------------------------+ 1600 | ``ACS_S9`` | scan line 9 | 1601 +------------------+------------------------------------------+ 1602 | ``ACS_SBBS`` | alternate name for lower right corner | 1603 +------------------+------------------------------------------+ 1604 | ``ACS_SBSB`` | alternate name for vertical line | 1605 +------------------+------------------------------------------+ 1606 | ``ACS_SBSS`` | alternate name for right tee | 1607 +------------------+------------------------------------------+ 1608 | ``ACS_SSBB`` | alternate name for lower left corner | 1609 +------------------+------------------------------------------+ 1610 | ``ACS_SSBS`` | alternate name for bottom tee | 1611 +------------------+------------------------------------------+ 1612 | ``ACS_SSSB`` | alternate name for left tee | 1613 +------------------+------------------------------------------+ 1614 | ``ACS_SSSS`` | alternate name for crossover or big plus | 1615 +------------------+------------------------------------------+ 1616 | ``ACS_STERLING`` | pound sterling | 1617 +------------------+------------------------------------------+ 1618 | ``ACS_TTEE`` | top tee | 1619 +------------------+------------------------------------------+ 1620 | ``ACS_UARROW`` | up arrow | 1621 +------------------+------------------------------------------+ 1622 | ``ACS_ULCORNER`` | upper left corner | 1623 +------------------+------------------------------------------+ 1624 | ``ACS_URCORNER`` | upper right corner | 1625 +------------------+------------------------------------------+ 1626 | ``ACS_VLINE`` | vertical line | 1627 +------------------+------------------------------------------+ 1628 1629 The following table lists the predefined colors: 1630 1631 +-------------------+----------------------------+ 1632 | Constant | Color | 1633 +===================+============================+ 1634 | ``COLOR_BLACK`` | Black | 1635 +-------------------+----------------------------+ 1636 | ``COLOR_BLUE`` | Blue | 1637 +-------------------+----------------------------+ 1638 | ``COLOR_CYAN`` | Cyan (light greenish blue) | 1639 +-------------------+----------------------------+ 1640 | ``COLOR_GREEN`` | Green | 1641 +-------------------+----------------------------+ 1642 | ``COLOR_MAGENTA`` | Magenta (purplish red) | 1643 +-------------------+----------------------------+ 1644 | ``COLOR_RED`` | Red | 1645 +-------------------+----------------------------+ 1646 | ``COLOR_WHITE`` | White | 1647 +-------------------+----------------------------+ 1648 | ``COLOR_YELLOW`` | Yellow | 1649 +-------------------+----------------------------+ 1650 1651 1652 :mod:`curses.textpad` --- Text input widget for curses programs 1653 =============================================================== 1654 1655 .. module:: curses.textpad 1656 :synopsis: Emacs-like input editing in a curses window. 1657 .. moduleauthor:: Eric Raymond <esr (a] thyrsus.com> 1658 .. sectionauthor:: Eric Raymond <esr (a] thyrsus.com> 1659 1660 1661 .. versionadded:: 1.6 1662 1663 The :mod:`curses.textpad` module provides a :class:`Textbox` class that handles 1664 elementary text editing in a curses window, supporting a set of keybindings 1665 resembling those of Emacs (thus, also of Netscape Navigator, BBedit 6.x, 1666 FrameMaker, and many other programs). The module also provides a 1667 rectangle-drawing function useful for framing text boxes or for other purposes. 1668 1669 The module :mod:`curses.textpad` defines the following function: 1670 1671 1672 .. function:: rectangle(win, uly, ulx, lry, lrx) 1673 1674 Draw a rectangle. The first argument must be a window object; the remaining 1675 arguments are coordinates relative to that window. The second and third 1676 arguments are the y and x coordinates of the upper left hand corner of the 1677 rectangle to be drawn; the fourth and fifth arguments are the y and x 1678 coordinates of the lower right hand corner. The rectangle will be drawn using 1679 VT100/IBM PC forms characters on terminals that make this possible (including 1680 xterm and most other software terminal emulators). Otherwise it will be drawn 1681 with ASCII dashes, vertical bars, and plus signs. 1682 1683 1684 .. _curses-textpad-objects: 1685 1686 Textbox objects 1687 --------------- 1688 1689 You can instantiate a :class:`Textbox` object as follows: 1690 1691 1692 .. class:: Textbox(win) 1693 1694 Return a textbox widget object. The *win* argument should be a curses 1695 :class:`WindowObject` in which the textbox is to be contained. The edit cursor 1696 of the textbox is initially located at the upper left hand corner of the 1697 containing window, with coordinates ``(0, 0)``. The instance's 1698 :attr:`stripspaces` flag is initially on. 1699 1700 :class:`Textbox` objects have the following methods: 1701 1702 1703 .. method:: edit([validator]) 1704 1705 This is the entry point you will normally use. It accepts editing 1706 keystrokes until one of the termination keystrokes is entered. If 1707 *validator* is supplied, it must be a function. It will be called for 1708 each keystroke entered with the keystroke as a parameter; command dispatch 1709 is done on the result. This method returns the window contents as a 1710 string; whether blanks in the window are included is affected by the 1711 :attr:`stripspaces` attribute. 1712 1713 1714 .. method:: do_command(ch) 1715 1716 Process a single command keystroke. Here are the supported special 1717 keystrokes: 1718 1719 +------------------+-------------------------------------------+ 1720 | Keystroke | Action | 1721 +==================+===========================================+ 1722 | :kbd:`Control-A` | Go to left edge of window. | 1723 +------------------+-------------------------------------------+ 1724 | :kbd:`Control-B` | Cursor left, wrapping to previous line if | 1725 | | appropriate. | 1726 +------------------+-------------------------------------------+ 1727 | :kbd:`Control-D` | Delete character under cursor. | 1728 +------------------+-------------------------------------------+ 1729 | :kbd:`Control-E` | Go to right edge (stripspaces off) or end | 1730 | | of line (stripspaces on). | 1731 +------------------+-------------------------------------------+ 1732 | :kbd:`Control-F` | Cursor right, wrapping to next line when | 1733 | | appropriate. | 1734 +------------------+-------------------------------------------+ 1735 | :kbd:`Control-G` | Terminate, returning the window contents. | 1736 +------------------+-------------------------------------------+ 1737 | :kbd:`Control-H` | Delete character backward. | 1738 +------------------+-------------------------------------------+ 1739 | :kbd:`Control-J` | Terminate if the window is 1 line, | 1740 | | otherwise insert newline. | 1741 +------------------+-------------------------------------------+ 1742 | :kbd:`Control-K` | If line is blank, delete it, otherwise | 1743 | | clear to end of line. | 1744 +------------------+-------------------------------------------+ 1745 | :kbd:`Control-L` | Refresh screen. | 1746 +------------------+-------------------------------------------+ 1747 | :kbd:`Control-N` | Cursor down; move down one line. | 1748 +------------------+-------------------------------------------+ 1749 | :kbd:`Control-O` | Insert a blank line at cursor location. | 1750 +------------------+-------------------------------------------+ 1751 | :kbd:`Control-P` | Cursor up; move up one line. | 1752 +------------------+-------------------------------------------+ 1753 1754 Move operations do nothing if the cursor is at an edge where the movement 1755 is not possible. The following synonyms are supported where possible: 1756 1757 +------------------------+------------------+ 1758 | Constant | Keystroke | 1759 +========================+==================+ 1760 | :const:`KEY_LEFT` | :kbd:`Control-B` | 1761 +------------------------+------------------+ 1762 | :const:`KEY_RIGHT` | :kbd:`Control-F` | 1763 +------------------------+------------------+ 1764 | :const:`KEY_UP` | :kbd:`Control-P` | 1765 +------------------------+------------------+ 1766 | :const:`KEY_DOWN` | :kbd:`Control-N` | 1767 +------------------------+------------------+ 1768 | :const:`KEY_BACKSPACE` | :kbd:`Control-h` | 1769 +------------------------+------------------+ 1770 1771 All other keystrokes are treated as a command to insert the given 1772 character and move right (with line wrapping). 1773 1774 1775 .. method:: gather() 1776 1777 Return the window contents as a string; whether blanks in the 1778 window are included is affected by the :attr:`stripspaces` member. 1779 1780 1781 .. attribute:: stripspaces 1782 1783 This attribute is a flag which controls the interpretation of blanks in 1784 the window. When it is on, trailing blanks on each line are ignored; any 1785 cursor motion that would land the cursor on a trailing blank goes to the 1786 end of that line instead, and trailing blanks are stripped when the window 1787 contents are gathered. 1788 1789
