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f9e8428061
The previous scrollbars were too chunky and encroached too much on a view's content. The new ones are slim and right-aligned so they encroach into dead space between views which is much better
29 lines
1.1 KiB
Go
29 lines
1.1 KiB
Go
package gocui
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import "math"
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// returns start and height of scrollbar
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// `max` is the maximum possible value of `position`
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func calcScrollbar(listSize int, pageSize int, position int, scrollAreaSize int) (int, int) {
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height := calcScrollbarHeight(listSize, pageSize, scrollAreaSize)
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// assume we can't scroll past the last item
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maxPosition := listSize - pageSize
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if maxPosition <= 0 {
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return 0, height
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}
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if position == maxPosition {
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return scrollAreaSize - height, height
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}
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// we only want to show the scrollbar at the top or bottom positions if we're at the end. Hence the .Ceil (for moving the scrollbar once we scroll down) and the -1 (for pretending there's a smaller range than we actually have, with the above condition ensuring we snap to the bottom once we're at the end of the list)
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start := int(math.Ceil(((float64(position) / float64(maxPosition)) * float64(scrollAreaSize-height-1))))
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return start, height
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}
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func calcScrollbarHeight(listSize int, pageSize int, scrollAreaSize int) int {
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if pageSize >= listSize {
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return scrollAreaSize
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}
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return int((float64(pageSize) / float64(listSize)) * float64(scrollAreaSize))
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}
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