1 files changed, 38 insertions, 0 deletions
diff --git a/src/controls.ts b/src/controls.ts
new file mode 100644
index 0000000..b575b3f
--- /dev/null
+++ b/src/controls.ts
@@ -0,0 +1,38 @@
+export interface Controls {
+  up: boolean,
+  right: boolean,
+  down: boolean,
+  left: boolean,
+  space: boolean,
+}
+
+export let current = {
+  up: false,
+  right: false,
+  down: false,
+  left: false,
+  space: false,
+}
+
+document.addEventListener('keydown', event => {
+  current = update(current, event.key, true)
+})
+
+document.addEventListener('keyup', event => {
+  current = update(current, event.key, false)
+})
+
+function update(current: Controls, key: string, isDown: boolean): Controls {
+  if (key === 'ArrowUp')
+    return { ...current, up: isDown }
+  else if (key === 'ArrowRight')
+    return { ...current, right: isDown }
+  else if (key === 'ArrowDown')
+    return { ...current, down: isDown }
+  else if (key === 'ArrowLeft')
+    return { ...current, left: isDown }
+  else if (key === ' ')
+    return { ...current, space: isDown }
+  else
+    return current
+}