curs_touch.3x 5.0 KB

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  1. .\"***************************************************************************
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  28. .\"
  29. .\" $Id: curs_touch.3x,v 1.11 2006/02/25 21:49:19 tom Exp $
  30. .TH curs_touch 3X ""
  31. .na
  32. .hy 0
  33. .SH NAME
  34. \fBtouchwin\fR,
  35. \fBtouchline\fR,
  36. \fBuntouchwin\fR,
  37. \fBwtouchln\fR,
  38. \fBis_linetouched\fR,
  39. \fBis_wintouched\fR - \fBcurses\fR refresh control routines
  40. .ad
  41. .hy
  42. .SH SYNOPSIS
  43. \fB#include <curses.h>\fR
  44. .br
  45. \fBint touchwin(WINDOW *win);\fR
  46. .br
  47. \fBint touchline(WINDOW *win, int start, int count);\fR
  48. .br
  49. \fBint untouchwin(WINDOW *win);\fR
  50. .br
  51. \fBint wtouchln(WINDOW *win, int y, int n, int changed);\fR
  52. .br
  53. \fBbool is_linetouched(WINDOW *win, int line);\fR
  54. .br
  55. \fBbool is_wintouched(WINDOW *win);\fR
  56. .br
  57. .SH DESCRIPTION
  58. The \fBtouchwin\fR and \fBtouchline\fR routines throw away all
  59. optimization information about which parts of the window have been
  60. touched, by pretending that the entire window has been drawn on. This
  61. is sometimes necessary when using overlapping windows, since a change
  62. to one window affects the other window, but the records of which lines
  63. have been changed in the other window do not reflect the change. The
  64. routine \fBtouchline\fR only pretends that \fIcount\fR lines have been
  65. changed, beginning with line \fIstart\fR.
  66. .PP
  67. The \fBuntouchwin\fR routine marks all lines in the window as unchanged since
  68. the last call to \fBwrefresh\fR.
  69. .PP
  70. The \fBwtouchln\fR routine makes \fIn\fR lines in the window, starting
  71. at line \fIy\fR, look as if they have (\fIchanged\fR\fB=1\fR) or have
  72. not (\fIchanged\fR\fB=0\fR) been changed since the last call to
  73. \fBwrefresh\fR.
  74. .PP
  75. The \fBis_linetouched\fR and \fBis_wintouched\fR routines return
  76. \fBTRUE\fR if the specified line/window was modified since the last
  77. call to \fBwrefresh\fR; otherwise they return \fBFALSE\fR. In
  78. addition, \fBis_linetouched\fR returns \fBERR\fR if \fIline\fR is not
  79. valid for the given window.
  80. .SH RETURN VALUE
  81. All routines return the integer \fBERR\fR upon failure and an integer value
  82. other than \fBERR\fR upon successful completion, unless otherwise noted in the
  83. preceding routine descriptions.
  84. .PP
  85. X/Open does not define any error conditions.
  86. In this implementation
  87. .RS
  88. .TP 5
  89. \fBis_linetouched\fP
  90. returns an error
  91. if the window pointer is null, or
  92. if the line number is outside the window.
  93. Note that ERR is distinct from TRUE and FALSE, which are the normal return values of this function.
  94. .TP 5
  95. \fBwtouchln\fP
  96. returns an error
  97. if the window pointer is null, or
  98. if the line number is outside the window.
  99. .RE
  100. .SH PORTABILITY
  101. The XSI Curses standard, Issue 4 describes these functions.
  102. .PP
  103. Some historic curses implementations had, as an undocumented feature, the
  104. ability to do the equivalent of \fBclearok(..., 1)\fR by saying
  105. \fBtouchwin(stdscr)\fR or \fBclear(stdscr)\fR. This will not work under
  106. ncurses.
  107. .SH NOTES
  108. Note that all routines except \fBwtouchln\fR may be macros.
  109. .SH SEE ALSO
  110. \fBcurses\fR(3X), \fBcurs_refresh\fR(3X).
  111. .\"#
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