73 lines
2.0 KiB
Go
73 lines
2.0 KiB
Go
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package main
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import (
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"fmt"
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"strings"
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"github.com/cqroot/prompt/constants"
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"github.com/cqroot/prompt/multichoose"
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)
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// Scrolling theme for cqroot/prompt. Allows items to be scrolled through
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// using the arrow keys.
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//
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// choices is a list of strings to display.
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// cursor is the index of the currently selected item.
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// isSelected is a function that returns true if the item at the given index
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func ThemeScroll(choices []string, cursor int, isSelected multichoose.IsSelected) string {
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s := strings.Builder{}
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s.WriteString("\n")
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lenChoices := len(choices)
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index := cursor
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limit := 10
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start := 0
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end := limit
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// Create a slice of items to display
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if lenChoices > limit {
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if index < limit/2 {
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end = limit
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} else if index >= limit/2 && index <= lenChoices-limit/2 {
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start = index - limit/2
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end = index + limit/2
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index = limit / 2
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} else {
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start = lenChoices - limit
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end = lenChoices
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index = limit - (lenChoices - index)
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}
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}
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// Loop through the slice and display each item.
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// We will determine if the item is selected or not by calling isSelected
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// with the index of the item, but since we're only displaying a slice of
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// the items we need to offset the index.
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for i, choice := range choices[start:end] {
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// offset represents the index of the item in the original list
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offset := i + start
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// Check if the item is the one at the cursor's location
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isCursor := index == i
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// Render item according to its state (selected + cursor / selected / normal)
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if isSelected(offset) {
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if isCursor {
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s.WriteString(constants.DefaultSelectedItemStyle.Render(fmt.Sprintf("[x] %s", choice)))
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} else {
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s.WriteString(constants.DefaultItemStyle.Render(fmt.Sprintf("[x] %s", choice)))
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}
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} else {
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if isCursor {
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s.WriteString(constants.DefaultSelectedItemStyle.Render(fmt.Sprintf("[•] %s", choice)))
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} else {
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s.WriteString(constants.DefaultItemStyle.Render(fmt.Sprintf("[ ] %s", choice)))
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}
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}
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s.WriteString("\n")
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}
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return s.String()
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}
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