From be8fb858cc810ff2125669e4e7e1254405f1ebc8 Mon Sep 17 00:00:00 2001
From: Daniel Gibson <metalcaedes@gmail.com>
Date: Thu, 16 Jul 2015 05:15:03 +0200
Subject: [PATCH] Add ImGuiIO::AddInputCharactersUTF8(char* utf8str)

It'll convert the utf8 string to ImWchar's and passes each of them
to AddInputCharacter().

Very handy for SDL2 SDL_TEXTINPUT events, which provide a buffer with an
UTF-8 string.
---
 imgui.cpp | 12 ++++++++++++
 imgui.h   |  1 +
 2 files changed, 13 insertions(+)

diff --git a/imgui.cpp b/imgui.cpp
index 915c581a..6083fa4d 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -778,6 +778,18 @@ void ImGuiIO::AddInputCharacter(ImWchar c)
     }
 }
 
+void ImGuiIO::AddInputCharactersUTF8(const char* utf8chars)
+{
+    // we can't pass more wchars than ImGuiIO::InputCharacters[] can hold so don't convert more
+    static const int wcharBufLen = sizeof(ImGuiIO::InputCharacters)/sizeof(ImWchar);
+    ImWchar wchars[wcharBufLen];
+    ImTextStrFromUtf8(wchars, wcharBufLen, utf8chars, NULL);
+    for(int i=0; i<wcharBufLen && wchars[i] != 0; ++i)
+    {
+        AddInputCharacter(wchars[i]);
+    }
+}
+
 // Math bits
 // We are keeping those static in the .cpp file so as not to leak them outside, in the case the user has implicit cast operators between ImVec2 and its own types.
 static inline ImVec2 operator*(const ImVec2& lhs, const float rhs)              { return ImVec2(lhs.x*rhs, lhs.y*rhs); }
diff --git a/imgui.h b/imgui.h
index 0cd4c162..d38a599b 100644
--- a/imgui.h
+++ b/imgui.h
@@ -705,6 +705,7 @@ struct ImGuiIO
 
     // Function
     IMGUI_API void AddInputCharacter(ImWchar c); // Helper to add a new character into InputCharacters[]
+    IMGUI_API void AddInputCharactersUTF8(const char* utf8chars); // Helper to add new characters into InputCharacters[] from an utf8-string
 
     //------------------------------------------------------------------
     // Output - Retrieve after calling NewFrame(), you can use them to discard inputs or hide them from the rest of your application