Kbase 12818: Button color: why MS-Windows ignores color changes
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
10/05/1998 |
|
Button color: why MS-Windows ignores color changes
Foreground and Background Colors on Buttons
-------------------------------------------
While running in the UIB and creating buttons,
you will see that the button property sheet
allows for foreground and background colors.
Yet, when you run this code, the button will
NOT change colors when running MS-Windows.
The reason for this restriction on the MS-Windows
platform is that the MS-Windows toolkit dictates
that all buttons must have the same color.
The only way that MS-Windows allows users to
change this color is via the Control Panel
and the Colors interface. In ignoring color
changes in MS-Windows, PROGRESS is only adhering
to this standard. This limitation will no change
in the future unless MS-Windows changes the
standard.
The reason that the UIB and PROGRESS
allows users to select foreground and background
colors for buttons is that under MOTIF this is
supported. The fact that we allow it on all
platforms and just ignore it when it is not
supported, makes it easier for application
developers to produce portable code.
If users insist on working around this limitation,
the way to do so is to load a bitmap to the button
which consists of a solid background in the
desired color along with the label text. (It
will not be possible to maintain label text
using the :LABEL attribute since the bitmap
will override it.)
Progress Software Technical Support Note # 12818