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1 @c -*-texinfo-*-
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2 @c This is part of the XEmacs Lisp Reference Manual.
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3 @c Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
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4 @c See the file lispref.texi for copying conditions.
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5 @setfilename ../../info/mouse.info
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6 @node Mouse
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7 @chapter The Mouse
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8 @cindex mouse
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9
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10 * Mouse Position:: Asking where the mouse is, or moving it.
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11
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12 @ignore @c Not in XEmacs.
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13 @node Mouse Tracking
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14 @section Mouse Tracking
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15 @cindex mouse tracking
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16 @cindex tracking the mouse
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17
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18 (deleted)
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19 @end ignore
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20
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21 @ignore
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22 @c These are not implemented yet.
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23
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24 These functions change the screen appearance instantaneously. The
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25 effect is transient, only until the next ordinary XEmacs redisplay. That
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26 is ok for mouse tracking, since it doesn't make sense for mouse tracking
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27 to change the text, and the body of @code{track-mouse} normally reads
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28 the events itself and does not do redisplay.
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29
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30 @defun x-contour-region window start end
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31 This function draws lines to make a box around the text from @var{start}
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32 to @var{end}, in window @var{window}.
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33 @end defun
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34
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35 @defun x-uncontour-region window start end
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36 This function erases the lines that would make a box around the text
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37 from @var{start} to @var{end}, in window @var{window}. Use it to remove
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38 a contour that you previously made by calling @code{x-contour-region}.
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39 @end defun
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40
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41 @defun x-draw-rectangle frame left top right bottom
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42 This function draws a hollow rectangle on frame @var{frame} with the
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43 specified edge coordinates, all measured in pixels from the inside top
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44 left corner. It uses the cursor color, the one used for indicating the
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45 location of point.
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46 @end defun
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47
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48 @defun x-erase-rectangle frame left top right bottom
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49 This function erases a hollow rectangle on frame @var{frame} with the
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50 specified edge coordinates, all measured in pixels from the inside top
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51 left corner. Erasure means redrawing the text and background that
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52 normally belong in the specified rectangle.
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53 @end defun
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54 @end ignore
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55
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56 @node Mouse Position
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57 @section Mouse Position
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58 @cindex mouse position
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59 @cindex position of mouse
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60
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61 The functions @code{mouse-position}, @code{mouse-pixel-position},
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62 @code{set-mouse-position} and @code{set-mouse-pixel-position} give
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63 access to the current position of the mouse.
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64
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65 @defun mouse-position &optional device
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66 This function returns a list (@var{window} @var{x} . @var{y}) giving the
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67 current mouse window and position. The position is given in character
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68 cells, where @samp{(0, 0)} is the upper-left corner.
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69
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70 @var{device} specifies the device on which to read the mouse position,
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71 and defaults to the selected device. If the device is a mouseless
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72 terminal or XEmacs hasn't been programmed to read its mouse position, it
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73 returns the device's selected window for @var{window} and @code{nil} for
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74 @var{x} and @var{y}.
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75 @end defun
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76
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77 @defun mouse-pixel-position &optional device
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78 This function returns a list (@var{window} @var{x} . @var{y}) giving the
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79 current mouse window and position. The position is given in pixel
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80 units, where @samp{(0, 0)} is the upper-left corner.
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81
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82 @var{device} specifies the device on which to read the mouse position,
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83 and defaults to the selected device. If the device is a mouseless
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84 terminal or XEmacs hasn't been programmed to read its mouse position, it
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85 returns the device's selected window for @var{window} and @code{nil} for
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86 @var{x} and @var{y}.
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87 @end defun
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88
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89 @defun set-mouse-position window x y
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90 This function @dfn{warps the mouse} to the center of character position
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91 @var{x}, @var{y} in frame @var{window}. The arguments @var{x} and
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92 @var{y} are integers, giving the position in characters relative to
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93 the top left corner of @var{window}.
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94
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95 @cindex warping the mouse
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96 @cindex mouse warping
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97 Warping the mouse means changing the screen position of the mouse as if
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98 the user had moved the physical mouse---thus simulating the effect of
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99 actual mouse motion.
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100 @end defun
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101
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102 @defun set-mouse-pixel-position window x y
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103 This function @dfn{warps the mouse} to pixel position @var{x}, @var{y}
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104 in frame @var{window}. The arguments @var{x} and @var{y} are integers,
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105 giving the position in pixels relative to the top left corner of
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106 @var{window}.
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107 @end defun
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