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comp.windows.x Frequently Asked Questions (FAQ) 7/7
Section - 158) Why do I get a BadDrawable error drawing to XtWindow(widget)?

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Top Document: comp.windows.x Frequently Asked Questions (FAQ) 7/7
Previous Document: 157) How do I determine the name of an existing widget?
Next Document: 159) Where can I get documentation on Xaw, the Athena widget set?
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I'm doing this in order to get a window into which I can do Xlib graphics
within my Xt-based program:

> canvas = XtCreateManagedWidget ( ...,widgetClass,...) /* drawing area */
> ...
> window = XtWindow(canvas);	/* get the window associated with the widget */
> ...
> XDrawLine (...,window,...);	/* produces error */

	The window associated with the widget is created as a part of the 
realization of the widget.  Using a window id of None ("no window") could 
create the error that you describe.  It is necessary to call XtRealizeWidget() 
before attempting to use the window associated with a widget. 
	Note that the window will be created after the XtRealizeWidget() call, 
but that the server may not have actually mapped it yet, so you should also 
wait for an Expose event on the window before drawing into it.

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Top Document: comp.windows.x Frequently Asked Questions (FAQ) 7/7
Previous Document: 157) How do I determine the name of an existing widget?
Next Document: 159) Where can I get documentation on Xaw, the Athena widget set?

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Last Update March 27 2014 @ 02:12 PM