88 lines
2.0 KiB
Go
88 lines
2.0 KiB
Go
package main
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import (
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"fmt"
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)
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//------------------------------------------------\\
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// + + + T Y P E S + + + \\
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//--------------------------------------------------\\
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type Pages struct {
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Position int
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Length int
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History [20]Page
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}
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//------------------------------------------------\\
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// + + + R E C E I V E R S + + + \\
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//--------------------------------------------------\\
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func (p *Pages) NavigateHistory(qty int) error {
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newPosition := p.Position + qty
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if newPosition < 0 {
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return fmt.Errorf("You are already at the beginning of history")
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} else if newPosition > p.Length - 1 {
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return fmt.Errorf("Your way is blocked by void, there is nothing forward")
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}
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p.Position = newPosition
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return nil
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}
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func (p *Pages) Add(pg Page) {
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if p.Position == p.Length - 1 && p.Length < len(p.History) {
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p.History[p.Length] = pg
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p.Length++
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p.Position++
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} else if p.Position == p.Length - 1 && p.Length == 20 {
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for x := 1; x < len(p.History); x++ {
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p.History[x-1] = p.History[x]
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}
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p.History[len(p.History)-1] = pg
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} else {
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p.Position += 1
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p.Length = p.Position + 1
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p.History[p.Position] = pg
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}
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}
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func (p *Pages) Render(termHeight, termWidth int) []string {
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if p.Length < 1 {
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return make([]string, 0)
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}
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pos := p.History[p.Position].ScrollPosition
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prev := len(p.History[p.Position].WrappedContent)
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p.History[p.Position].WrapContent(termWidth)
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now := len(p.History[p.Position].WrappedContent)
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if prev > now {
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diff := prev - now
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pos = pos - diff
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} else if prev < now {
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diff := now - prev
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pos = pos + diff
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if pos > now - termHeight {
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pos = now - termHeight
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}
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}
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if pos < 0 || now < termHeight - 3 {
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pos = 0
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}
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p.History[p.Position].ScrollPosition = pos
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return p.History[p.Position].WrappedContent[pos:]
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}
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//------------------------------------------------\\
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// + + + F U N C T I O N S + + + \\
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//--------------------------------------------------\\
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func MakePages() Pages {
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return Pages{-1, 0, [20]Page{}}
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}
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