Example of scrolling group?
dougtechie at tiscali.co.uk
Thu Jun 3 20:35:04 EDT 2010
I have been struggling for weeks trying to get scrolling working as well.
A while ago, I looked at the example quoted by Trevor below, and thought
"Easy, - I can do that"
I simply can't get the scroll bars to appear at all reliably, even while
building the stack in Browse mode in the editor.
I am trying to cover for the user having a smaller screen than my app
really needs, so automatically shrink the stack to acceptable size after
I have tried using a single item in a group as well as with the actual
group of items that would need to be scrollable.
Most of the time I just get a grey rectangle with nothing in it for both
H and V bars.
I have tried using lockLocation - doesn't seem to make any difference.
Cut down bits of my code below - anything obviously wrong there?
I also tried the example program:
And it won't work at all for Vertical bars!
I haven't spent any time trying to debug it yet, but it just does not
display a vertical bar when selected.
It just keeps the display of a horizontal bar and messes it up!
What is everyone doing wrong? Is it just my OS or Rev version.
I have tried Rev 3.5 and 4.0 both on OSX 10.5.8.
I am just about to try on a Windows PC
I hope someone can point out the obvious thing that I seem to be missing!
-- this app needs a window 630 wide by 865 approx (PLUS menus and
Dock if on on OSX!)
-- globals used gScrHeight, gScrWidth, gWinHeight, gWinWidth,
put 630 into gNeedWidth
put 865 into gNeedHeight
put item 3 of the screenRect into gScrWidth
put item 4 of the screenRect into gScrHeight
if (gScrHeight < 1000) then
-- shrink the V size of stack to acceptable size for the monitor
revChangeWindowSize 630,(gScrHeight -150)
-- do something about scrollbars in here !!!!!!!!!
-- ie full size window without scroll bars
put the height of this card into gWinHeight
put the width of this card into gWinWidth
if gScrHeight < 1000 then
answer error "This system really requires a screen display which
has at least 1000 pixels vertically." \
& cr &"This screen is "&gScrWidth &"x"&gScrHeight& "."& cr &\
"It's OK, the window has been shrunk to fit and you will need to
scroll it to get to all data fields." \
-- Note- this is just the START of this routine - Can't get bars to
appear and incomplete anyway!
-- use this to disable/enable Vertical scroll bar if needed for
window size vs required stack size
-- using a general group name of PageGroup for group containing
EVERYTHING on card!
if (gWinHeight < gNeedHeight ) then
set the lockLocation of group "PageGroup" to true -- does it
need to be unlocked again later????????
set the vScrollbar of group "PageGroup" to true
set the vScroll of group "PageGroup" to 0 -- how-much it appears
scrolled ( not at all at start!)
-- Presumably still need to set size of scrollbar and also its offset!
--(Calculate scrollsize based on amount of visible gWinHeight V
set the vScrollbar of group "PageGroup" to false
On 01/06/2010 13:45, Trevor DeVore wrote:
> On May 29, 2010, at 9:20 PM, Jeff Massung wrote:
>> Anyone have a good example of how to make a group that scrolls (like the
>> data grid)? I haven't seen anything in the User's Guide or on the RunRev
>> site - although I could have missed it.
> This lesson shows how to use a group to scroll large images.
More information about the Use-livecode