74 lines
1.4 KiB
Go
74 lines
1.4 KiB
Go
package ui
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import (
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"fmt"
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tb "github.com/nsf/termbox-go"
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)
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type Stack struct {
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children []Drawable
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onInvalidate func(d Drawable)
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}
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func NewStack() *Stack {
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return &Stack{}
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}
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func (stack *Stack) OnInvalidate(onInvalidate func (d Drawable)) {
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stack.onInvalidate = onInvalidate
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}
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func (stack *Stack) Invalidate() {
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if stack.onInvalidate != nil {
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stack.onInvalidate(stack)
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}
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}
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func (stack *Stack) Draw(ctx *Context) {
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if len(stack.children) > 0 {
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stack.Peek().Draw(ctx)
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} else {
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cell := tb.Cell{
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Fg: tb.ColorDefault,
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Bg: tb.ColorDefault,
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Ch: ' ',
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}
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ctx.Fill(0, 0, ctx.Width(), ctx.Height(), cell)
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}
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}
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func (stack *Stack) Push(d Drawable) {
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if len(stack.children) != 0 {
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stack.Peek().OnInvalidate(nil)
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}
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stack.children = append(stack.children, d)
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d.OnInvalidate(stack.invalidateFromChild)
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stack.Invalidate()
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}
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func (stack *Stack) Pop() Drawable {
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if len(stack.children) == 0 {
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panic(fmt.Errorf("Tried to pop from an empty UI stack"))
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}
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d := stack.children[len(stack.children)-1]
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stack.children = stack.children[:len(stack.children)-1]
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stack.Invalidate()
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d.OnInvalidate(nil)
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if len(stack.children) != 0 {
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stack.Peek().OnInvalidate(stack.invalidateFromChild)
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}
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return d
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}
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func (stack *Stack) Peek() Drawable {
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if len(stack.children) == 0 {
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panic(fmt.Errorf("Tried to peek from an empty stack"))
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}
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return stack.children[len(stack.children)-1]
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}
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func (stack *Stack) invalidateFromChild(d Drawable) {
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stack.Invalidate()
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}
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