From f2aeecccc096728d3df955b71e711c8d9c429427 Mon Sep 17 00:00:00 2001
From: Fabian Mastenbroek <mail.fabianm@gmail.com>
Date: Fri, 16 Jul 2021 17:37:01 +0200
Subject: refactor(ui): Isolate world coordinate space

This change updates the topology view in the OpenDC frontend to isolate
the world coordinate space. This means that zooming and panning should
not affect the coordinates in world space (but only in camera space). In
turn, this allows us to remove the dependency on Redux for the camera
controls.
---
 opendc-web/opendc-web-ui/src/util/effect-ref.js | 41 +++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 opendc-web/opendc-web-ui/src/util/effect-ref.js

(limited to 'opendc-web/opendc-web-ui/src/util/effect-ref.js')

diff --git a/opendc-web/opendc-web-ui/src/util/effect-ref.js b/opendc-web/opendc-web-ui/src/util/effect-ref.js
new file mode 100644
index 00000000..cda0324b
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/util/effect-ref.js
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+import { useCallback, useRef } from 'react'
+
+const noop = () => {}
+
+/**
+ * A hook that will invoke the specified callback when the reference returned by this function is initialized.
+ * The callback can return an optional clean up function.
+ */
+export function useEffectRef(callback) {
+    const disposeRef = useRef(noop)
+    return useCallback((element) => {
+        disposeRef.current()
+        disposeRef.current = noop
+
+        if (element) {
+            disposeRef.current = callback(element) || noop
+        }
+    }, []) // eslint-disable-line react-hooks/exhaustive-deps
+}
-- 
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