[Tcl-bugs] [ tktoolkit-Bugs-220934 ] Canvas item active and Enter fail if mouse moves quickly

[<no...@so...>]

Bugs item #220934, was opened at 2000-10-31 17:33
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=112997&aid=220934&group_id=12997

Category: 05. Canvas Items
Group: = 8.3.1
Status: Closed
Resolution: Invalid
Priority: 5
Submitted By: Brent B. Welch (welch)
Assigned to: Nobody/Anonymous (nobody)
Summary: Canvas item active and Enter fail if mouse moves quickly

Initial Comment:
OriginalBugID: 5989 Bug
Version: 8.3.1
SubmitDate: '2000-07-06'
LastModified: 
Severity: LOW
Status: UnAssn
Submitter: techsupp
OS: Windows NT
OSVersion: NT 4.0 SP5 Server
Machine: 600MHz, 256KRAM


Name:
Roy E. Terry

ReproducibleScript:
package require Tk
canvas .c
set rid [.c create rectangle 10 10 100 100]
.c itemconfigure $rid -activefill yellow
# .c bind $rid <Enter> {puts "Entered [incr eCnt]"}
pack .c

ObservedBehavior:
when the mouse moves *slowly* into the rectangle it becomes active and 
turns yellow. When the mouse is quickly moved to the center area of the
rectancle (not point to its border) then the rectangle never turns yellow.

DesiredBehavior:
Mouse over a canvas item should (eventually) always be detected and standard behavior should be then executed. In this case the rectangle should eventually
turn yellow as long as the pointer remains in the rectangle.





----------------------------------------------------------------------

Comment By: Gerhard Hintermayer (hinteger)
Date: 2001-12-27 12:56

Message:
Logged In: YES 
user_id=124720

But that behavior is absolutely senseless. Or do you
consider  the pointer as "outside", if the mouse is moved
into the rectangle very quick ??
I think that bug was introduced with the dash patch, since
that behavior was definitely not in 8.0.5.
I even submitted a TIP
http://tcl.activestate.com/cgi-bin/tct/tip/46.html for that,
but noone ever responded to it, maybe I should contact one
of the TCT directly, Jeff ?
My TIP basically sugests, that all objects are "real"
objects have a) vertices *AND* b) an area (*regardless* of a
fill color) and not have different combinations of a) and b)
for different canvas objects.
The tip also sugests a special fill color (e.g. "hollow")
for objects, that are only wireframes. (like in the not
desired example of Roy)


There even was a patch to correct that (at least for poly
and rectangle I think, consisting of just a few lines,
submitted by John Ellon) but that patch never seemed to
reach one of the TCT members

Gerhard Hintermayer

----------------------------------------------------------------------

Comment By: Jeffrey Hobbs (hobbs)
Date: 2001-12-27 11:59

Message:
Logged In: YES 
user_id=72656

As noted by hinteger, an unfilled rectangle only has valid 
points on the edge, and when moving a mouse quickly, mouse 
points will get dropped.

----------------------------------------------------------------------

Comment By: Gerhard Hintermayer (hinteger)
Date: 2000-12-21 08:21

Message:
Points inside of a rectangle are not considered as "inside" points, so I think <Enter> should only work on the vertices. For the disired behavior a polygon should be used.


----------------------------------------------------------------------

You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=112997&aid=220934&group_id=12997