chiu@efi.com (Chan Chiu) (10/23/90)
I need a canvas area for my graphics editor area. Looks like drawing area widget is intened for such use. However, I find out drawing area doesn't support mouse drag callback. Mouse drag is essential for Mac style bounding box selection. Can I still use drawing area with some patches ? Or, do I use a customized widget (or Xt, Xlib nonwidget solution) ? Thanks. /CC
db3l@ibm.com (David Bolen) (10/23/90)
In article <1990Oct22.232454.224@efi.com> chiu@efi.com (Chan Chiu) writes: >Mouse drag is essential for Mac style bounding box selection. Can I still >use drawing area with some patches ? Or, do I use a customized widget >(or Xt, Xlib nonwidget solution) ? I also use a XmDrawingArea widget as my primary window area, and just add a normal X event handler for mouse movement, using XtAddEventHandler for the widget with a mask of PointerMotionMask. I use the XmNinputCallback for button and keyboard input. -- David -- /-----------------------------------------------------------------------\ \ David Bolen / | Laboratory Automation, IBM Thomas J. Watson Research Center | / P.O. Box 218, Yorktown Heights, NY 10598 \ | - - - - - - - - - - - - M i t h r a n d i r - - - - - - - - - - - - | | Internet : db3l@ibm.com | Bitnet : db3l@yktvmv | | Usenet : uunet!bywater!arnor!larios!db3l | Phone : (914) 945-1940 | \-----------------------------------------------------------------------/
klee@wsl.dec.com (Ken Lee) (10/23/90)
In article <1990Oct22.232454.224@efi.com>, chiu@efi.com (Chan Chiu) writes: |> I need a canvas area for my graphics editor area. Looks like drawing |> area widget is intened for such use. However, I find out drawing |> area doesn't support mouse drag callback. |> |> Mouse drag is essential for Mac style bounding box selection. Can I still |> use drawing area with some patches ? Or, do I use a customized widget |> (or Xt, Xlib nonwidget solution) ? XtAddEventHandler will give you a mouse motion callback on any widget. You can also use the <Motion> translation table entry. Still, in the long run you'll probably be better off writing your own widget to do your graphics. The Motif window widget is intended for quick upgrades of Xlib (or similar) programs to Motif. Your own widget will give you much more flexibility, including full access to the X Toolkit resource, geometry, translation, and subclassing mechanims. -- Ken Lee DEC Western Software Laboratory, Palo Alto, Calif. Internet: klee@wsl.dec.com uucp: uunet!decwrl!klee