Телеграмм чат группы proalgorithms страница 3753

14:27пожаловаться #1

@smallville7123 the main idea of scroll bar is that the ratio content size above : visible content size : content size below equals to the ratio space above the scroller thumb : thumb size : space below the thumb

14:27пожаловаться #2

Matthew Good

When might they go out of bounds?

If content size is lower than that of the container

14:27пожаловаться #3

You will have 8 - 30 then, which is negative

14:28пожаловаться #4

Matthew Good in pro.algorithms

Azure Mynn

You will have 8 - 30 then, which is negative

Hm ok

14:28пожаловаться #5

Matthew Good

Yes but I want to implement the logic myself

Why just not to use a ready solution?

14:30пожаловаться #6

Matthew Good in pro.algorithms

*boots up pc and tries it*

14:30пожаловаться #7

Matthew Good in pro.algorithms

Vadim Averin

Why just not to use a ready solution?

Cus im working with android

14:30пожаловаться #8

oh...

14:31пожаловаться #9

why didn't you say about that before???

14:31пожаловаться #10

Matthew Good

*boots up pc and tries it*

Gud luck U wU)

14:31пожаловаться #11

Matthew Good in pro.algorithms

Azure Mynn

Oh, well, you divide the current position of the bar by the total height of it (minus the height of the draggable bar itself) to get a value between 0 and 1, you can then multiply it by the page height in pixels or something to get the desired offset

so would it be something like this?

multiplier = scrollBarPosition / (getHeight() - scrollBarPosition);

absoluteOffsetLast = absoluteOffset;

absoluteOffset = multiplier * (documentHeight - windowHeight);

relativeOffset = absoluteOffset = absoluteOffsetLast;

scrolling = true;

document.scrollBy(0, (int) relativeOffset);

scrolling = false;

14:45пожаловаться #12

I guess lol? I think you should just go ahead and try it

14:46пожаловаться #13

why not to use a ready-to-use android scrollbar?

14:47пожаловаться #14

Matthew Good in pro.algorithms

hmm i get

getHeight() = [460]
scrollBarPosition = [314.1255]
multiplier = [2.1533954]
documentHeight = [1500.0]
windowHeight = [460.0]
absoluteOffset = [0.0]

14:47пожаловаться #15

Matthew Good in pro.algorithms

google shows 2.1533954 * (1500 - 460) = 2239.531216

14:52пожаловаться #16

Matthew Good

so would it be something like this?

multiplier = scrollBarPosition / (getHeight() - scrollBarPosition);

absoluteOffsetLast = absoluteOffset;

absoluteOffset = multiplier * (documentHeight - windowHeight);

relativeOffset = absoluteOffset = absoluteOffsetLast;

scrolling = true;

document.scrollBy(0, (int) relativeOffset);

scrolling = false;

Hold up, don't subtract scrollbarPosition out of getHeight()

14:53пожаловаться #17

Matthew Good in pro.algorithms

oh i think its cus i have relativeOffset = absoluteOffset = absoluteOffsetLast;

14:53пожаловаться #18

You need multiplier = scrollBarPosition / (getHeight() - scrollThumbHeight);

14:53пожаловаться #19

Matthew Good in pro.algorithms

it should be relativeOffset = absoluteOffset - absoluteOffsetLast; right?