Problem with 1st try at a scroller
Posted: Mon Apr 01, 2013 7:46 pm
Hi - I've puzzled over this until the screen is starting to go blank in front of my eyes and I can't seem to figure out what is going on, so I'm hoping someone can give me a tip. I think that the answer is staring me in the face, but i can't pull it out.
To initially get started with creating a scroller I downloaded a tutorial that works just great - except that it I can't seem to change the position of the field and scroll area without the scroller refusing to display the first few lines of the text.
"Out of the box", the example has the text field positioned in the upper left hand corner of the screen. I have tried numerous ways to move it down and toward the center, as would be a more typical situation. When it first displays, the top of the text within the field is visible, but as soon as the scroller is activated, it will scroll down and back up again, but now clipping the first few lines.
I've been testing this on the Android simulator and a device, but I thought that this is a more general question than for just the Android forum.
Here is the code, cut and pasted from the example. The only thing I change is the position of the text field and the scroll area object when I run into trouble.
Thanks in advance for any advice.
To initially get started with creating a scroller I downloaded a tutorial that works just great - except that it I can't seem to change the position of the field and scroll area without the scroller refusing to display the first few lines of the text.
"Out of the box", the example has the text field positioned in the upper left hand corner of the screen. I have tried numerous ways to move it down and toward the center, as would be a more typical situation. When it first displays, the top of the text within the field is visible, but as soon as the scroller is activated, it will scroll down and back up again, but now clipping the first few lines.
I've been testing this on the Android simulator and a device, but I thought that this is a more general question than for just the Android forum.
Here is the code, cut and pasted from the example. The only thing I change is the position of the text field and the scroll area object when I run into trouble.
Thanks in advance for any advice.
Code: Select all
local sScrollerID
on preOpenCard
local tScrollerRect, tContentRect
// Only create a scroller on a mobile device
if environment() is not "mobile" then exit preOpenCard
// Set the area of the scroller
put the rect of group "scrollArea" into tScrollerRect
// Set the are of the content to be scrolled
put the left of field "lorem",the top of field "lorem",the right of field "lorem",the formattedHeight of field "lorem" into tContentRect
// Create the scroller control
mobileControlCreate "scroller", "loremScroll"
put the result into sScrollerID
// Set the properties of the scroller
mobileControlSet "loremScroll", "rect", tScrollerRect
mobileControlSet "loremScroll", "contentRect", tContentRect
mobileControlSet "loremScroll", "visible", true
mobileControlSet "loremScroll", "scrollingEnabled", true
mobileControlSet "loremScroll", "vIndicator", true
mobileControlSet "loremScroll", "vscroll", 0
end preOpenCard
on closeCard
// Delete the scroller
if environment() is not "mobile" then exit closeCard
mobileControlDelete sScrollerID
end closeCard
on scrollerDidScroll hOffset, vOffset
// When the user scrolls move the displayed content
set the vScroll of group "scrollArea" to vOffset
end scrollerDidScroll