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From: zhengt@mentor.cc.purdue.edu (Tong Zheng)
Newsgroups: comp.windows.interviews
Subject: Rubber Banding in InterViews
Keywords: Rubber Banding InterViews
Message-ID: <10241@mentor.cc.purdue.edu>
Date: 12 Apr 91 18:07:02 GMT
Reply-To: zhengt@mentor.cc.purdue.edu (Tong Zheng)
Organization: General Consultant, ME Comp. Lab, Purdue U.
Lines: 48


Hello, 

I have two questions about doing Rubber Banding
in InterViews.  I believe I am using version 2.6.

I am working on a project that offers user to draw
a rubber banding box to select portion of a Graphic
area.  Well, I found a RubberRect class and implemented
in my codes, I got the rectangular box, but had seen
two problems,

1) When the program received a DownEvent, I created the
   RubberRect object, then if a MotionEvent arrives,
   method Track() will be used to erase previous box
   and draw a new box upon currect pointer position,
   UpEvent will terminate this rubber banding session.
   I think I follow the right track to form a rubber banding,
   but funny thing is I never am able to get a MotionEvent.
   So user can only see a box appearing at the end when
   the button is released.

2) The rubber box can't redraw itself when is exposed after a
   obscuring.  

For problem 1), has anyone had success to do a rubber banding or
using MotionEvent? If so, is it possible that I can have a copy 
of a working sample? or could someone point out what I did wrong 
in my way drawing rubber banding?

For problem 2), in X programming logic, I know client should
handle the exposure.  But in InterViews, there is no such a thing
called ExposeEvent exists.  Is there any alternative way to detect
the exposure event in InterViews?

Any help is appreciated.  If there are enough interets, I will
post a summary on this.


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*                                                                *
|*  Zheng, Tong                |  ARPA: tongz@ecn.purdue.edu    *|
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