dirty initial commit

game/EventAdapter.js

@@ -0,0 +1,38 @@
+export default class EventAdapter {
+    constructor(canvas) {
+        this._mouseEvts = []
+        canvas.addEventListener('mousedown', this._mouseDown.bind(this))
+        canvas.addEventListener('mouseup', this._mouseUp.bind(this))
+        canvas.addEventListener('mousemove', this._mouseMove.bind(this))
+        canvas.addEventListener('wheel', this._wheel.bind(this))
+    }
+    
+    consumeAll() {
+        if (this._mouseEvts.length === 0) {
+            return []
+        }
+        const all = this._mouseEvts.slice()
+        this._mouseEvts = []
+        return all
+    }
+
+    _mouseDown(e) {
+        if (e.button === 0) {
+            this._mouseEvts.push({type: 'down', x: e.offsetX, y: e.offsetY})
+        }
+    }
+
+    _mouseUp(e) {
+        if (e.button === 0) {
+            this._mouseEvts.push({type: 'up', x: e.offsetX, y: e.offsetY})
+        }
+    }
+
+    _mouseMove(e) {
+        this._mouseEvts.push({type: 'move', x: e.offsetX, y: e.offsetY})
+    }
+
+    _wheel(e) {
+        this._mouseEvts.push({type: 'wheel', y: e.deltaY})
+    }
+}