MG
You need
multiplier = scrollBarPosition / (getHeight() - scrollThumbHeight);hm ok
relativeOffset = absoluteOffset - absoluteOffsetLast; right?Size: a a a
2021 January 03
AM
Matthew Good
it should be
No clue what this is about lol
MG
to convert absolute offset to relative offset per frame
MG
eg get the amount of pixels the bar has moved in comparison to the last absolute position
AM
Matthew Good
it should be
relativeOffset = absoluteOffset - absoluteOffsetLast; right?Yes
MG
hmm it seems to be off
MG
when i scroll the scroll bar all the way to the bottom, my content does not get scrolled all the way to the bottom
MG
and it seems to scroll by a less amount depending on how fast i move the scroll bar
AM
That has something to do with the relative scrolling thingy, is there really not an API to just specify an absolute value?
MG
That has something to do with the relative scrolling thingy, is there really not an API to just specify an absolute value?
ill see if i can find one
MG
this seems to work
document.scrollBy(0, -documentScrollY);
document.scrollBy(0, (int) absoluteOffset);
MG
Matthew Good
and it seems to scroll by a less amount depending on how fast i move the scroll bar
ok, this can be fixed by scrolling when i draw my view
MG
which means i do not need to scroll when i compute the scroll position either 🙂
MG
now, if i want to also be able to scroll via contents (eg scrolling the contents also scrolls the scroll bar) how should i go about such?
eg the contents being scrolled also synchronizes the current position of the scroll bar
eg the contents being scrolled also synchronizes the current position of the scroll bar
AM
Just do the whole algorithm in reverse
MG
o.o
MG
im not sure how
AM
Matthew Good
im not sure how
Take the final scroll value as the input and scrollBarPosition as the output
MG
would it be something like this?
void scrollThumb() {
multiplier2 = documentScrollY / (windowHeight - documentHeight);
absoluteOffset2 = multiplier2 * (getHeight() - clip.getHeight());
clip.setY(absoluteOffset2);
}
void scrollDocument() {
multiplier = clip.getY() / (getHeight() - clip.getHeight());
absoluteOffset = multiplier * (documentHeight - windowHeight);
scrolling = true;
document.scrollBy(0, -documentScrollY);
document.scrollBy(0, (int) absoluteOffset);
scrolling = false;
}AM
multiplier = absoluteOffset / (documentHeight - windowHeight);
scrollBarPosition = multiplier * (getHeight() - scrollBarPosition);