| Title: | DECWINDOWS 26-JAN-89 to 29-NOV-90 |
| Notice: | See 1639.0 for VMS V5.3 kit; 2043.0 for 5.4 IFT kit |
| Moderator: | STAR::VATNE |
| Created: | Mon Oct 30 1989 |
| Last Modified: | Mon Dec 31 1990 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 3726 |
| Total number of notes: | 19516 |
A question that has come up:
The default visual class for widgets created on a firefox is TrueColor.
The application I am developing requires a DirectColor window. As far
as I can see there is no way to change the visual for a widget. I've
tried changeing the realize call for the widget. In the realize
routine I used XMatchVisualInfo to get the visual for 24bits
directcolor however when I do the XtCreateWindow I get a bad match
error. However, if I use a visual of CopyFromParent I don't get this
error, I also don't get a DirectColor Window, catch 22.
The widget I was creating is a child of a scroll_window which
was the child of a main_window. The widget were created using UIL and
if possible I'd like to do it this way. I traped the realize call
using the created callback in the UIL interface. In the callback
routine I changed the pointer
widget->core.widget_class->core_class.realize to point to my realize
routine. My realize routine was called. Is there a way to do this on
vms 5.3?
Thanks,
Collis Jackson
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 2797.1 | Colormaps | LEOVAX::TREGGIARI | Wed May 23 1990 11:53 | 32 | |
> In the realize > routine I used XMatchVisualInfo to get the visual for 24bits > directcolor however when I do the XtCreateWindow I get a bad match > error. That may be from the color map. You could try calling XCreateWindow yourself with a color map that matches the visual. Note that setting XtNcolorMap should do the job, but doesn't work until R4 Intrinsics. Here's the "meat" of XtCreateWindow. widget->core.window = XCreateWindow ( XtDisplay (widget), (widget->core.parent ? widget->core.parent->core.window : widget->core.screen->root), (int)widget->core.x, (int)widget->core.y, (unsigned)widget->core.width, (unsigned)widget->core.height, (unsigned)widget->core.border_width, (int) widget->core.depth, window_class, visual, value_mask, attributes); > In the callback > routine I changed the pointer > widget->core.widget_class->core_class.realize to point to my realize > routine. My realize routine was called. Not a very "friendly" habit to get into. Note that you are changing the realize proc for *every* widget class of that type in your process... Leo | |||||