From b833f588b3d9528e7fc650d841ee7a46b6c0ba78 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson@vistahigherlearning.com>
Date: Fri, 30 Dec 2016 11:19:48 -0500
Subject: Add bindings for text input event handling.

* sdl2/bindings.scm (sdl-start-text-input, sdl-stop-text-input,
sdl-is-text-input-active): New procedures.
* sdl2/events.scm (<text-input-event>): New record type.
(make-text-input-event, text-input-event?, text-input-event-timestamp,
text-input-event-window-id, text-input-event-text,
parse-text-input-event): New procedures.
* sdl2/input/text.scm: New file.
* Makefile.am (SOURCES): Add it.
---
 sdl2/events.scm | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

(limited to 'sdl2/events.scm')

diff --git a/sdl2/events.scm b/sdl2/events.scm
index aa08fff..c9e391b 100644
--- a/sdl2/events.scm
+++ b/sdl2/events.scm
@@ -1,5 +1,5 @@
 ;;; guile-sdl2 --- FFI bindings for SDL2
-;;; Copyright © 2015 David Thompson <davet@gnu.org>
+;;; Copyright © 2015, 2016 David Thompson <davet@gnu.org>
 ;;;
 ;;; This file is part of guile-sdl2.
 ;;;
@@ -70,6 +70,12 @@
             keyboard-event-scancode
             keyboard-event-modifiers
 
+            make-text-input-event
+            text-input-event?
+            text-input-event-timestamp
+            text-input-event-window-id
+            text-input-event-text
+
             make-mouse-button-event
             mouse-button-event?
             mouse-button-down-event?
@@ -810,6 +816,28 @@
                           (scancode->symbol scancode)
                           (mod->list mod)))))
 
+
+;;;
+;;; Text Input
+;;;
+
+(define-record-type <text-input-event>
+  (make-text-input-event timestamp window-id text)
+  text-input-event?
+  (timestamp text-input-event-timestamp)
+  (window-id text-input-event-window-id)
+  (text text-input-event-text))
+
+(define (parse-text-input-event ptr)
+  ;; Separate the first 3 struct fields which are all uint32s from the
+  ;; 32-byte UTF-8 encoded character buffer at the end of the struct.
+  (let* ((len (* (sizeof uint32) 3))
+         (bv (pointer->bytevector ptr len))
+         (timestamp (u32vector-ref bv 1))
+         (window-id (u32vector-ref bv 2))
+         (text (pointer->string (make-pointer (+ (pointer-address ptr) len)))))
+    (make-text-input-event timestamp window-id text)))
+
 
 ;;;
 ;;; Mouse
@@ -991,6 +1019,8 @@
             ((or (= type ffi:SDL_KEYDOWN)
                  (= type ffi:SDL_KEYUP))
              (parse-keyboard-event ptr))
+            ((= type ffi:SDL_TEXTINPUT)
+             (parse-text-input-event ptr))
             ((or (= type ffi:SDL_MOUSEBUTTONDOWN)
                  (= type ffi:SDL_MOUSEBUTTONUP))
              (parse-mouse-button-event ptr))
-- 
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