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package main
import (
"fmt"
"sync"
"github.com/aarzilli/nucular"
)
type ViewFunc func(ctx *ntcontext, w *nucular.Window)
type ViewStack struct {
stack [100]ViewFunc
sp int8
mu sync.Mutex
}
func NewViewStack() *ViewStack {
return &ViewStack{sp: -1}
}
func (v *ViewStack) Push(f ViewFunc) {
v.mu.Lock()
defer v.mu.Unlock()
v.stack[v.sp+1] = f
v.sp++
}
func (v *ViewStack) Pop() (ViewFunc, error) {
v.mu.Lock()
if v.sp <= 0 {
return nil, fmt.Errorf("Cannot pop root element from ViewStack")
}
defer (func() {
v.stack[v.sp] = nil
v.sp--
v.mu.Unlock()
})()
return v.stack[v.sp], nil
}
func (v *ViewStack) Peek() ViewFunc {
v.mu.Lock()
defer v.mu.Unlock()
return v.stack[v.sp]
}
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