| Re: Widget_List resizing problem [message #7260] |
Mon, 28 October 1996 00:00 |
sterner
Messages: 106
Registered: February 1991
|
Senior Member |
|
|
davidf@fortnet.org (David Fanning) writes:
. . .
> With respect to list widgets, one thing you might try is to make all
> the string elements in the list the same length. Then there will be no
> need to resize as you scroll through the list. (At least if you are using
> a fixed-spaced font, as you claim.)
Here is a code fragment to pad all the lines of a string array
to match the longest line. It's not as general as David's
function but it might have its place:
padded = string(byte(string_array)>32B)
Ray Sterner sterner@tesla.jhuapl.edu
The Johns Hopkins University North latitude 39.16 degrees.
Applied Physics Laboratory West longitude 76.90 degrees.
Laurel, MD 20723-6099
WWW Home page: http://fermi.jhuapl.edu/s1r/people/res/res.html
|
|
|
|
| Re: Widget_List resizing problem [message #7265 is a reply to message #7260] |
Sat, 26 October 1996 00:00  |
davidf
Messages: 2866
Registered: September 1996
|
Senior Member |
|
|
Brian Jackel <brian.jackel@uwo.ca> writes:
> I'm running IDL 4.0.1 under Windows95, and List Widgets are driving me
> crazy. Specifically, they tend to resize themselves (horizontally) after
> every two or three events (clicks or cursor up/down).
I am not sure about this, because I haven't been around Windows 95 enough
to know for sure, but it appears to me that Windows 95 does a lot of
automatic resizing of widgets. Most of the time, this is what I want, but
I can understand how it might be annoying too.
With respect to list widgets, one thing you might try is to make all
the string elements in the list the same length. Then there will be no
need to resize as you scroll through the list. (At least if you are using
a fixed-spaced font, as you claim.)
Here is a little function of mine that takes a string (or string array)
and pads it with blank characters so that it is always a specified
length. It might be just what you are looking for.
Good luck!
David
***********************************************************
FUNCTION PADSTRING, thisString, length
; This function takes the input string and pads it with blanks
; to make a string of a specified length. The variable
; "thisString" can be a scalar string or an array of strings.
; If "thisString" is longer than the specified length, the
; string is truncated.
ON_ERROR, 1
; Must have one parameter.
IF N_PARAMS() LT 1 THEN $
MESSAGE, 'Must pass at least one parameter to this function.'
; Is first parameter a string?
s = SIZE(thisString)
IF s(s(0) + 1) NE 7 THEN $
MESSAGE, 'First parameter must be a string variable.'
; Define default string length if necessary.
IF N_PARAMS() LT 2 THEN length = 20
; Create a return value (can be an array).
paddedString = thisString
; Do the string padding.
FOR j=0, N_ELEMENTS(thisString)-1 DO BEGIN
; Check to be sure thisString is not too long.
IF N_ELEMENTS(thisString(j)) GT length THEN $
thisString(j) = STRMID(thisString(j), 0, length)
padding = STRING(REPLICATE(32B, length))
STRPUT, padding, thisString(j), 0
paddedString(j) = padding
ENDFOR
RETURN, paddedString
END
*******************************************************
--
David Fanning, Ph.D.
Phone: 970-221-0438
Fax: 970-221-4728
E-Mail: davidf@fortnet.org
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
