riddle@mathcs.emory.edu (Larry Riddle) (06/21/89)
I need some help with the following problem:
I have a scrolling field with a list of names of hidden fields. When
the user clicks on one of the names, that field is made visible.
In addition, I have a button that is moved over the line where the
click was made and then the button's hilite property is set to true.
All this works fine. However, my problem is when the user then scrolls
to see other lines in the field. As soon as the user starts to scroll,
I would like my button to become unhilited so as not to distract from
the scrolling field and ruin the visual effect. I suspect I could do
this by overlaying my own buttons on top of the scroll bar to simulate
the scrolling, but I am hoping that there might be a quicker and
easier solution. What I would really like is something like
on clicking in the scroll bar
set hilite of btn x to false
start the normal scrolling behavior
end clicking in the scroll bar
Any suggestions?
--
Larry Riddle | riddle@mathcs.emory.edu PREFERRED
Emory University | {decvax,gatech}!emory!riddle UUCP
Dept of Math and CS | riddle@emory NON-DOMAIN BITNET
Atlanta, GA 30322 | (404) 727-7922 AT&Tdlugose@ecsvax.UUCP (Dan Dlugose) (06/21/89)
In article <4161@emory.mathcs.emory.edu> riddle@mathcs.emory.edu (Larry Riddle) writes: >In addition, I have a button that is moved over the line where the >click was made and then the button's hilite property is set to true. >All this works fine. However, my problem is when the user then scrolls >to see other lines in the field. As soon as the user starts to scroll, >I would like my button to become unhilited so as not to distract from >the scrolling field and ruin the visual effect. I suspect I could do I think you'll need overlaying button(s) or field(s). However, one invisible button over everything could decide whether it needed to unhilite any other buttons, and then pass the mouseup. Dan Dlugose UNC Edu. Computing Service
baum@Apple.COM (Allen J. Baum) (06/22/89)
[] >In article <4161@emory.mathcs.emory.edu> riddle@mathcs.emory.edu (Larry Riddle) writes: >I need some help with the following problem: ...basically, highlighting a line of a scrolling field >Any suggestions? I had exactly the same problem. I'm assuming you don't want more than one line highlighted at once. I set the locktext of the scrolling field to true, so that mouseclicks on the field send mouseup/down to the script of the field. The script is: on mouseup set lockText of me to false --stop intercepted mouseclicks click at clickloc --put text cursor in field select the selectedline --use 'selectedline' function to select line set lockText of me true --start intercepting mouseclicks again --put your action here, i.e. set visible of field (word 2 of the selectedline) to true end mouseup You can determine the number of the line that you selected by looking at word 2 of the selectedline Note that if a line wraps, both 'physical' lines will be selected. This is fairly slow, unfortunately. I'm not sure what is taking so long, but it may be just a bit too slow for real interactive work. -- baum@apple.com (408)974-3385 {decwrl,hplabs}!amdahl!apple!baum
baum@Apple.COM (Allen J. Baum) (06/22/89)
[] >In article <4161@emory.mathcs.emory.edu> riddle@mathcs.emory.edu (Larry Riddle) writes: >In addition, I have a button that is moved over the line where the >click was made and then the button's hilite property is set to true. >All this works fine. However, my problem is when the user then scrolls >to see other lines in the field. As soon as the user starts to scroll, >I would like my button to become unhilited so as not to distract from >the scrolling field and ruin the visual effect. I suspect I could do > Oops, I solved the wrong problem in the last message. The problem is not highlighting the field, but un-highlighting when you scroll. I would put a button over the scrollbar. The button should be hidden, until the field script is executed,. i.e., inside the field script should be: set visible of button "scrollbut" to true Then, the button script should deselect the line in the field, and hide itself: on mousedown --note, this is a mousedown, not mouseup handler select char 2 to 1 of cd field "scrollfield" --unselect line set visible of me to false --hide me end mousedown -- baum@apple.com (408)974-3385 {decwrl,hplabs}!amdahl!apple!baum
beard@wuibc.UUCP (James Beard MD) (06/23/89)
[in response to a query about how to make a click in the scroll bar of a scrolling field un-highlight a button overlying a line of text in the field.] I can't be certain I understand what you are trying to do, but I would suggest the following: 1) Perhaps you could dispense with the button entirely, if its sole purpose is to highlight the selected line. Version 1.2 allows you to highlight a chunk of a field from within a script. You can first deduce what line of the field was clicked in. Apple gives some examples of this, which requires using the mouseloc at clicking time, the height of a line of text (one of the fld properties), and how far scrolled the field is (a fld property). Assume that you have deduced that the line clicked was line x. Then you could write ... select line x of fld myField ... Besides being faster than moving a button around, this has the advantage that the highlighted line remains highlighted (even during scrolling out of and into view) until you do something to un-highlight it. 2) Version 1.2 has a new operator, Within, that lets you ask whether a given point is within a certain rectangle. An expression of the form "<point> is within <rect>" will return a value of either true or false. Thus you could include something like the following in the script of the scrolling field, assuming that you had previously put the rect of the scroll bar into scrollzone: on mousedown global scrollzone get the mouseloc if it is within scrollzone then select empty -- this undoes the highlighting pass mousedown -- this lets the scroll bar do its scrolling work end mousedown (Not having tried the above, I can't guarantee it will work. But I think something very like it will.) James C. Beard (beard@wuibc2.wustl.edu)
taylorj@yvax.byu.edu (06/26/89)
I agree with the other guys that it would probably be more efficient to
dispense with the button, but here's a quick and easy way to find out if the
user has scrolled the field. When you put up the button, save the scroll state
of the field in a global variable ('put the scroll of field <whatever> into
oldScroll'). The put a mouseWithin handler in the field that checks to see
if the scroll has changed. It would look something like this:
on mouseWithin
global oldScroll
if the scroll of me <> oldScroll then
-- user has scrolled: hide button, or whatever you need to do
end if
end mouseWithin
Jim Taylor
Microcomputer Support for Curriculum
Brigham Young University
taylorj@byuvax.bitnet