| Re: Problems with bitmapped button widget [message #59870 is a reply to message #59775] |
Mon, 14 April 2008 14:18   |
Spon
Messages: 178
Registered: September 2007
|
Senior Member |
|
|
On Apr 14, 8:29 pm, Bob Crawford <Snowma...@gmail.com> wrote:
> On Apr 11, 10:38 am, Spon <christoph.b...@gmail.com> wrote:
>
>
>
>> On Apr 11, 3:26 pm, Spon <christoph.b...@gmail.com> wrote:
>
>>> On Apr 11, 12:56 pm, rhyme2ri2 <rhyme2...@gmail.com> wrote:
>
>>>> Hello all,
>
>>>> A very simple thing i'm trying to do but somehow i'm stuck with it....
>>>> I want a bitmapped button. For this i'm using following :
>
>>>> cmddownloadall = Widget_Button(pradar, UNAME='cmddownloadall' $
>>>> ,XOFFSET=800 ,YOFFSET=100 ,SCR_XSIZE=30 ,SCR_YSIZE=24 $
>>>> ,/ALIGN_CENTER,TOOLTIP='Download All files' $
>>>> ,VALUE='downloadall.bmp' ,sensitive=0,frame=1,/BITMAP)
>
>>>> Well this is it and i'm not able to get the image button. Issues like
>>>> checking the availability of file or trying to provide the full path
>>>> name of image file are already addressed by me :)
>>>> Image is a 24-bit bitmap.
>
>>>> What it shows is just a blank button with the frame or sometimes just
>>>> the text written in value..(strange but true)
>
>>>> Can any one point out where m i wrong??
>
>>>> Thanks & Regards
>>>> -Ritu
>
>>> Using IDL v6.4 on Windows XP Pro, I can duplicate your problem. It
>>> goes away when I set sensitivity = 1
>>> I guess it might be a bug.
>>> Can anyone else verify this?
>
>>> Regards,
>>> Chris
>
>> Looking at it again, it may even be a Feature. I can merrily show and
>> hide the bitmap at will if I stick in a second button that switches
>> the sensitivity of the bitmap button on and off.- Hide quoted text -
>
>> - Show quoted text -
>
> On my system at least 'c:\windows\coffee bean.bmp' is an 8-bit
> bitmap.
>
> Using a 24-bit version has a slightly different effect, rather than
> hiding the whole image the color appears to be turned on/off.
Hi Bob,
Yes, I should've picked a 24-bit file, I guess.
I've tried that now, and yes, with a 24-bit file you can always tell
the bitmaps's there even when the button isn't active. It may be grey,
but it's not invisible, like with 8-bit ones.
According to the helpfile, the bottom left hand pixel's value gets
designated the 'background' value in 24-bit pixels, and becomes see-
through. I'm not sure how this affects how it's displayed in its
'greyed-out' state, maybe it just averages across the r,g,b colour
values for every point or something.
>
> BTW Using your example code the image is visible when the button is
> labelled "On". Isn't that sensitivity = 1?
Yes. The whole point of my example code was to show that I can toggle
bitmap visibility by toggling button sensitivity. :-)
It's what convinced me that the effect was a feature, not a bug.
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
