cleanup - part II

reshuffle file structure to make more sense

src/resizer/distributors/collapse.js

@@ -0,0 +1,53 @@
+/*
+Copyright 2018 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import FixedDistributor from "./fixed";
+import ResizeItem from "../item";
+
+class CollapseItem extends ResizeItem {
+    notifyCollapsed(collapsed) {
+        const callback = this.resizer.config.onCollapsed;
+        if (callback) {
+            callback(collapsed, this.id, this.domNode);
+        }
+    }
+}
+
+export default class CollapseDistributor extends FixedDistributor {
+    static createItem(resizeHandle, resizer, sizer) {
+        return new CollapseItem(resizeHandle, resizer, sizer);
+    }
+
+    constructor(item, config) {
+        super(item);
+        this.toggleSize = config && config.toggleSize;
+        this.isCollapsed = false;
+    }
+
+    resize(newSize) {
+        const isCollapsedSize = newSize < this.toggleSize;
+        if (isCollapsedSize && !this.isCollapsed) {
+            this.isCollapsed = true;
+            this.item.notifyCollapsed(true);
+        } else if (!isCollapsedSize && this.isCollapsed) {
+            this.item.notifyCollapsed(false);
+            this.isCollapsed = false;
+        }
+        if (!isCollapsedSize) {
+            super.resize(newSize);
+        }
+    }
+}