34 lines
1,013 B
Go
34 lines
1,013 B
Go
package tree
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import (
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"github.com/ayn2op/discordo/internal/config"
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"github.com/ayn2op/tview/keybind"
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"github.com/ayn2op/tview/tree"
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)
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// SelectHelp returns the up and down keybinds that move the selection away from current.
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func SelectHelp(root, current *tree.Node, kbs config.TreeKeybinds) []keybind.Keybind {
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var help []keybind.Keybind
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if canSelectUp(root, current) {
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help = append(help, kbs.SelectUp.Keybind)
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}
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if canSelectDown(root, current) {
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help = append(help, kbs.SelectDown.Keybind)
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}
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return help
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}
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// canSelectUp reports whether a node is shown above current.
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func canSelectUp(root, current *tree.Node) bool {
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children := root.Children()
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return current != nil && len(children) > 0 && current != children[0]
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}
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// canSelectDown reports whether a node is shown below current.
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func canSelectDown(root, current *tree.Node) bool {
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last := root
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for last.Expanded() && len(last.Children()) > 0 {
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last = last.Children()[len(last.Children())-1]
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}
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return last != root && current != last
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}
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