From 3b814d7eb0b60c691803aa8681bcbd222acac36d Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Fri, 10 Nov 2017 21:29:40 -0500
Subject: input: mouse: Add mouse-button-released?

* sdl2/input/mouse.scm (mouse-button-released?): New procedure.
---
 sdl2/input/mouse.scm | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sdl2/input/mouse.scm b/sdl2/input/mouse.scm
index 55c7833..c172909 100644
--- a/sdl2/input/mouse.scm
+++ b/sdl2/input/mouse.scm
@@ -31,7 +31,8 @@
   #:use-module (system foreign)
   #:export (mouse-x
             mouse-y
-            mouse-button-pressed?))
+            mouse-button-pressed?
+            mouse-button-released?))
 
 (define (make-int)
   (make-bytevector (sizeof int)))
@@ -65,3 +66,7 @@
                 ('x2 ffi:SDL_BUTTON_X2MASK)))
         (buttons (ffi:sdl-get-mouse-state %null-pointer %null-pointer)))
     (> (logand mask buttons) 0)))
+
+(define (mouse-button-released? button)
+  "Return #t if BUTTON is not currently being pressed."
+  (not (mouse-button-pressed? button)))
-- 
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