From 304a8f19274ca908ad8824be7e7824b4511ad2fc Mon Sep 17 00:00:00 2001
From: Romain Goyet <romain@goyet.com>
Date: Wed, 2 Sep 2015 22:09:24 +0200
Subject: [PATCH] Demo app flush the screen when needed

---
 src/hello.cpp | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/hello.cpp b/src/hello.cpp
index 66fc629bd..9f9213f2e 100644
--- a/src/hello.cpp
+++ b/src/hello.cpp
@@ -8,14 +8,6 @@ extern "C" {
 #include <poincare.h>
 
 void hello() {
-
-  KDFillRect((KDRect){
-      .x = 0,
-      .y = 0,
-      .width = 320,
-      .height = 240},
-      0x7F);
-
   char input[255];
 
   int index = 0;
@@ -26,6 +18,14 @@ void hello() {
       index = 0;
       CreateFromString(input);
     } else {
+      if (index == 0) {
+        KDFillRect((KDRect){
+            .x = 0,
+            .y = 0,
+            .width = 320,
+            .height = 240},
+            0x7F);
+      }
       input[index++] = character;
       input[index] = 0;
       KDDrawString(input, (KDPoint){.x = 40, .y = 40});