From cd70bc039b882b4aa8eaba76599a6833bbff4f62 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Fri, 10 Nov 2017 01:27:43 +0900
Subject: [PATCH] examples/typewriter: Enable backspace

---
 examples/typewriter/main.go | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/examples/typewriter/main.go b/examples/typewriter/main.go
index 17b863647..885b9cf72 100644
--- a/examples/typewriter/main.go
+++ b/examples/typewriter/main.go
@@ -25,8 +25,9 @@ import (
 )
 
 var (
-	text    = "Type on the keyboard:\n"
-	counter = 0
+	text          = "Type on the keyboard:\n"
+	counter       = 0
+	bsPrevPressed = false
 )
 
 func update(screen *ebiten.Image) error {
@@ -38,6 +39,13 @@ func update(screen *ebiten.Image) error {
 	if ebiten.IsKeyPressed(ebiten.KeyEnter) && !strings.HasSuffix(text, "\n") {
 		text += "\n"
 	}
+	bsPressed := ebiten.IsKeyPressed(ebiten.KeyBackspace)
+	if !bsPrevPressed && bsPressed {
+		if len(text) >= 1 {
+			text = text[:len(text)-1]
+		}
+	}
+	bsPrevPressed = bsPressed
 
 	counter++