Fix drawing when UI overlapping, add toast messages

application/toast.go

@@ -0,0 +1,49 @@
+package application
+
+import (
+	"fmt"
+	"time"
+
+	raylib "github.com/gen2brain/raylib-go/raylib"
+)
+
+var (
+	toasts      = []Toast{}
+	toastHeight = float32(0)
+	toastMaxAge = 5 * time.Second
+)
+
+type Toast struct {
+	Text string
+	Age  time.Time
+}
+
+func AddToast(text string) {
+	toast := Toast{Text: text, Age: time.Now()}
+	toasts = append(toasts, toast)
+}
+
+func UpdateToasts() {
+	if len(toasts) != 0 {
+		toastHeight = raylib.Lerp(toastHeight, float32(20*len(toasts))+10, 0.1)
+	} else {
+		toastHeight = raylib.Lerp(toastHeight, 0, 0.1)
+	}
+
+	for i := 0; i < len(toasts); i++ {
+		if time.Since(toasts[i].Age) > toastMaxAge {
+			toasts = append(toasts[:i], toasts[i+1:]...)
+			i--
+		}
+	}
+}
+
+func DrawToasts() {
+	raylib.BeginScissorMode(0, 0, WindowWidth, int32(toastHeight))
+	raylib.DrawRectangle(0, 0, WindowWidth, WindowHeight, raylib.Fade(raylib.Black, 0.5))
+	for i := 0; i < len(toasts); i++ {
+		text := fmt.Sprintf("%s (%s)", toasts[i].Text, time.Since(toasts[i].Age).Round(time.Second))
+		raylib.DrawText(text, 10, int32(20*i)+10, 10, raylib.White)
+	}
+	raylib.EndScissorMode()
+}