From a8a3295f268f7180d63f43aa421214e8ae182626 Mon Sep 17 00:00:00 2001
From: Ray Greenwell <ray@threerings.net>
Date: Thu, 12 Apr 2007 23:49:29 +0000
Subject: [PATCH] Conveniently, it appears that the extra events generated by
 key repeat are all KEY_DOWN events. So holding down a key in flash generates:
 DOWN, DOWN, DOWN, ... UP. In Java, we get DOWN, UP, DOWN, UP ...

Made a little helper class that can be used to block the extra DOWN events.


git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@195 ed5b42cb-e716-0410-a449-f6a68f950b19
---
 .../com/threerings/flash/KeyRepeatBlocker.as  | 58 +++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 src/as/com/threerings/flash/KeyRepeatBlocker.as

diff --git a/src/as/com/threerings/flash/KeyRepeatBlocker.as b/src/as/com/threerings/flash/KeyRepeatBlocker.as
new file mode 100644
index 00000000..bdc211ba
--- /dev/null
+++ b/src/as/com/threerings/flash/KeyRepeatBlocker.as
@@ -0,0 +1,58 @@
+package com.threerings.flash {
+
+import flash.events.EventDispatcher;
+import flash.events.IEventDispatcher;
+
+import flash.events.KeyboardEvent;
+
+import flash.utils.Dictionary;
+import flash.utils.getTimer; // function import
+
+/**
+ * A very simple class that adapts the KeyboardEvents generated by some source by discarding
+ * the extra KEY_DOWN events generated while a key is held down.
+ */
+public class KeyRepeatBlocker extends EventDispatcher
+{
+    /**
+     * Create a KeyRepeatBlocker that will be blocking key repeat events from
+     * the specified source.
+     */
+    public function KeyRepeatBlocker (source :IEventDispatcher)
+    {
+        _source = source;
+
+        _source.addEventListener(KeyboardEvent.KEY_DOWN, handleKeyDown);
+        _source.addEventListener(KeyboardEvent.KEY_UP, handleKeyUp);
+    }
+
+    /**
+     * Dispose of this KeyRepeatBlocker.
+     */
+    public function shutdown () :void
+    {
+        _source.removeEventListener(KeyboardEvent.KEY_DOWN, handleKeyDown);
+        _source.removeEventListener(KeyboardEvent.KEY_UP, handleKeyUp);
+    }
+
+    protected function handleKeyDown (event :KeyboardEvent) :void
+    {
+        if (!_down[event.keyCode]) {
+            _down[event.keyCode] = true;
+            dispatchEvent(event);
+        }
+    }
+
+    protected function handleKeyUp (event :KeyboardEvent) :void
+    {
+        delete _down[event.keyCode];
+        dispatchEvent(event);
+    }
+
+    /** Our source. */
+    protected var _source :IEventDispatcher;
+
+    /** Tracks whether a key is currently being held down. */
+    protected var _down :Dictionary = new Dictionary();
+}
+}