ColouringApp/toast.go

package main

import (
	"time"

	raylib "github.com/gen2brain/raylib-go/raylib"
)

type toast struct {
	Text   string
	Age    time.Time
	MaxAge time.Duration
}

var (
	toasts         = []toast{}
	toastDimHeight = float32(0)
)

func AddToast(text string) {
	t := toast{Text: text, Age: time.Now(), MaxAge: 1 * time.Second}
	toasts = append(toasts, t)
}

func UpdateToasts() {
	if len(toasts) != 0 {
		toastDimHeight = raylib.Lerp(toastDimHeight, float32(20*len(toasts))+10, 0.1)
	} else {
		toastDimHeight = raylib.Lerp(toastDimHeight, 0, 0.1)
	}

	for i, t := range toasts {
		if time.Since(t.Age) > t.MaxAge {
			toasts = append(toasts[:i], toasts[i+1:]...)
			i -= 1
		}
	}
}

func DrawToasts() {
	raylib.BeginScissorMode(0, 0, applicationWindowWidth, int32(toastDimHeight))
	{
		raylib.DrawRectangle(0, 0, applicationWindowWidth, applicationWindowHeight, raylib.Fade(raylib.Black, 0.5))
		for i, t := range toasts {
			raylib.DrawText(t.Text, 10, int32(20*i)+10, 10, raylib.White)
		}
	}
	raylib.EndScissorMode()
}