tips:revmedia:v3i10a27

Uncommon Knowledge - WC_VWindow%

Published ByDateVersionKnowledge LevelKeywords
Sprezzatura Ltd01 APR 19922.11+EXPERTWINDOW_COMMON%, WC_VWINDOW%, VSPACE, VIDEO.RW, VIRTUAL.PARAMS

The Vspace image of the current window. Note that this image does not contain the border of the window. Note further that in the case of table mode, the box image will be included (although not that of the heading which is in Vhead q.v.). As a VSpace image may conceivably be wider than the physical screen it cannot normally be manipulated for use by Video.Rw per VPrev but it can be directly updated using Vspace calls.

Thus for example, if it was wished to provide the user with a softkey which showed the current prompt width and then at a keypress returned to the screen, one could use a code fragment such as the sample below which uses VSpace to save off whatever is currently displayed on screen using a VSave call, displays a string of * as long as Vsp_Len then waits for a keypress. At a keypress it restores the image saved by the VSave call using a VRstr call.

  Subroutine Display_Length
     $Insert Include, Window_Common%
     $Insert Include, Virtual.Params
     Declare Subroutine VSpace
     Win = WC_VWindow% ; X = WC_Vsp_VX%
     Y = WC_Vsp_VY% ; Len = WC_Vsp_VLen%

     * Firstly save what is on screen already
     VSpace(VSave,OK,Win,X,Y,X+Len,Y,Img)
     * Now put up the length mask
     VSpace(VPrnt,OK,Win,X,Y,Str("*",Len))
     * Wait for a keypress
     Call Input.Char(Dummy)
     * Now restore the old screen image
     VSpace(VRSTR,OK,Win,X,Y,X+Len,Y,Img)
  Return

(Volume 3, Issue 10, Page 15)

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