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website/src/lib/logic/selection.ts

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+import type { ListItem } from '$lib/components/file-list/file-list';
+
+export class SelectionTreeType {
+    item: ListItem;
+    selected: boolean;
+    children: {
+        [key: string | number]: SelectionTreeType;
+    };
+    size: number = 0;
+
+    constructor(item: ListItem) {
+        this.item = item;
+        this.selected = false;
+        this.children = {};
+    }
+
+    clear() {
+        this.selected = false;
+        for (let key in this.children) {
+            this.children[key].clear();
+        }
+        this.size = 0;
+    }
+
+    _setOrToggle(item: ListItem, value?: boolean) {
+        if (item.level === this.item.level) {
+            let newSelected = value === undefined ? !this.selected : value;
+            if (this.selected !== newSelected) {
+                this.selected = newSelected;
+                this.size += this.selected ? 1 : -1;
+            }
+        } else {
+            let id = item.getIdAtLevel(this.item.level);
+            if (id !== undefined) {
+                if (!this.children.hasOwnProperty(id)) {
+                    this.children[id] = new SelectionTreeType(this.item.extend(id));
+                }
+                this.size -= this.children[id].size;
+                this.children[id]._setOrToggle(item, value);
+                this.size += this.children[id].size;
+            }
+        }
+    }
+
+    set(item: ListItem, value: boolean) {
+        this._setOrToggle(item, value);
+    }
+
+    toggle(item: ListItem) {
+        this._setOrToggle(item);
+    }
+
+    has(item: ListItem): boolean {
+        if (item.level === this.item.level) {
+            return this.selected;
+        } else {
+            let id = item.getIdAtLevel(this.item.level);
+            if (id !== undefined) {
+                if (this.children.hasOwnProperty(id)) {
+                    return this.children[id].has(item);
+                }
+            }
+        }
+        return false;
+    }
+
+    hasAnyParent(item: ListItem, self: boolean = true): boolean {
+        if (
+            this.selected &&
+            this.item.level <= item.level &&
+            (self || this.item.level < item.level)
+        ) {
+            return this.selected;
+        }
+        let id = item.getIdAtLevel(this.item.level);
+        if (id !== undefined) {
+            if (this.children.hasOwnProperty(id)) {
+                return this.children[id].hasAnyParent(item, self);
+            }
+        }
+        return false;
+    }
+
+    hasAnyChildren(item: ListItem, self: boolean = true, ignoreIds?: (string | number)[]): boolean {
+        if (
+            this.selected &&
+            this.item.level >= item.level &&
+            (self || this.item.level > item.level)
+        ) {
+            return this.selected;
+        }
+        let id = item.getIdAtLevel(this.item.level);
+        if (id !== undefined) {
+            if (ignoreIds === undefined || ignoreIds.indexOf(id) === -1) {
+                if (this.children.hasOwnProperty(id)) {
+                    return this.children[id].hasAnyChildren(item, self, ignoreIds);
+                }
+            }
+        } else {
+            for (let key in this.children) {
+                if (ignoreIds === undefined || ignoreIds.indexOf(key) === -1) {
+                    if (this.children[key].hasAnyChildren(item, self, ignoreIds)) {
+                        return true;
+                    }
+                }
+            }
+        }
+        return false;
+    }
+
+    getSelected(selection: ListItem[] = []): ListItem[] {
+        if (this.selected) {
+            selection.push(this.item);
+        }
+        for (let key in this.children) {
+            this.children[key].getSelected(selection);
+        }
+        return selection;
+    }
+
+    forEach(callback: (item: ListItem) => void) {
+        if (this.selected) {
+            callback(this.item);
+        }
+        for (let key in this.children) {
+            this.children[key].forEach(callback);
+        }
+    }
+
+    getChild(id: string | number): SelectionTreeType | undefined {
+        return this.children[id];
+    }
+
+    deleteChild(id: string | number) {
+        if (this.children.hasOwnProperty(id)) {
+            this.size -= this.children[id].size;
+            delete this.children[id];
+        }
+    }
+}