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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { Event } from 'vs/base/common/event';
import { IListRenderer, IListDragOverReaction, IListDragAndDrop, ListDragOverEffect } from 'vs/base/browser/ui/list/list';
import { IDragAndDropData } from 'vs/base/browser/dnd';
export const enum TreeVisibility {
/**
* The tree node should be hidden.
*/
Hidden,
/**
* The tree node should be visible.
*/
Visible,
/**
* The tree node should be visible if any of its descendants is visible.
*/
Recurse
}
/**
* A composed filter result containing the visibility result as well as
* metadata.
*/
export interface ITreeFilterDataResult<TFilterData> {
/**
* Whether the node should be visible.
*/
visibility: boolean | TreeVisibility;
/**
* Metadata about the element's visibility which gets forwarded to the
* renderer once the element gets rendered.
*/
data: TFilterData;
}
/**
* The result of a filter call can be a boolean value indicating whether
* the element should be visible or not, a value of type `TreeVisibility` or
* an object composed of the visibility result as well as additional metadata
* which gets forwarded to the renderer once the element gets rendered.
*/
export type TreeFilterResult<TFilterData> = boolean | TreeVisibility | ITreeFilterDataResult<TFilterData>;
/**
* A tree filter is responsible for controlling the visibility of
* elements in a tree.
*/
export interface ITreeFilter<T, TFilterData = void> {
/**
* Returns whether this elements should be visible and, if affirmative,
* additional metadata which gets forwarded to the renderer once the element
* gets rendered.
*
* @param element The tree element.
*/
filter(element: T, parentVisibility: TreeVisibility): TreeFilterResult<TFilterData>;
}
export interface ITreeSorter<T> {
compare(element: T, otherElement: T): number;
}
export interface ITreeElement<T> {
readonly element: T;
readonly children?: Iterable<ITreeElement<T>>;
readonly collapsible?: boolean;
readonly collapsed?: boolean;
}
export interface ITreeNode<T, TFilterData = void> {
readonly element: T;
readonly children: ITreeNode<T, TFilterData>[];
readonly depth: number;
readonly visibleChildrenCount: number;
readonly visibleChildIndex: number;
readonly collapsible: boolean;
readonly collapsed: boolean;
readonly visible: boolean;
readonly filterData: TFilterData | undefined;
}
export interface ICollapseStateChangeEvent<T, TFilterData> {
node: ITreeNode<T, TFilterData>;
deep: boolean;
}
export interface ITreeModelSpliceEvent<T, TFilterData> {
insertedNodes: ITreeNode<T, TFilterData>[];
deletedNodes: ITreeNode<T, TFilterData>[];
}
export interface ITreeModel<T, TFilterData, TRef> {
readonly rootRef: TRef;
readonly onDidSplice: Event<ITreeModelSpliceEvent<T, TFilterData>>;
readonly onDidChangeCollapseState: Event<ICollapseStateChangeEvent<T, TFilterData>>;
readonly onDidChangeRenderNodeCount: Event<ITreeNode<T, TFilterData>>;
has(location: TRef): boolean;
getListIndex(location: TRef): number;
getListRenderCount(location: TRef): number;
getNode(location?: TRef): ITreeNode<T, any>;
getNodeLocation(node: ITreeNode<T, any>): TRef;
getParentNodeLocation(location: TRef): TRef | undefined;
getFirstElementChild(location: TRef): T | undefined;
getLastElementAncestor(location?: TRef): T | undefined;
isCollapsible(location: TRef): boolean;
setCollapsible(location: TRef, collapsible?: boolean): boolean;
isCollapsed(location: TRef): boolean;
setCollapsed(location: TRef, collapsed?: boolean, recursive?: boolean): boolean;
expandTo(location: TRef): void;
rerender(location: TRef): void;
refilter(): void;
}
export interface ITreeRenderer<T, TFilterData = void, TTemplateData = void> extends IListRenderer<ITreeNode<T, TFilterData>, TTemplateData> {
renderTwistie?(element: T, twistieElement: HTMLElement): void;
onDidChangeTwistieState?: Event<T>;
}
export interface ITreeEvent<T> {
elements: T[];
browserEvent?: UIEvent;
}
export enum TreeMouseEventTarget {
Unknown,
Twistie,
Element
}
export interface ITreeMouseEvent<T> {
browserEvent: MouseEvent;
element: T | null;
target: TreeMouseEventTarget;
}
export interface ITreeContextMenuEvent<T> {
browserEvent: UIEvent;
element: T | null;
anchor: HTMLElement | { x: number; y: number; };
}
export interface ITreeNavigator<T> {
current(): T | null;
previous(): T | null;
first(): T | null;
last(): T | null;
next(): T | null;
}
export interface IDataSource<TInput, T> {
hasChildren?(element: TInput | T): boolean;
getChildren(element: TInput | T): Iterable<T>;
}
export interface IAsyncDataSource<TInput, T> {
hasChildren(element: TInput | T): boolean;
getChildren(element: TInput | T): Iterable<T> | Promise<Iterable<T>>;
}
export const enum TreeDragOverBubble {
Down,
Up
}
export interface ITreeDragOverReaction extends IListDragOverReaction {
bubble?: TreeDragOverBubble;
autoExpand?: boolean;
}
export const TreeDragOverReactions = {
acceptBubbleUp(): ITreeDragOverReaction { return { accept: true, bubble: TreeDragOverBubble.Up }; },
acceptBubbleDown(autoExpand = false): ITreeDragOverReaction { return { accept: true, bubble: TreeDragOverBubble.Down, autoExpand }; },
acceptCopyBubbleUp(): ITreeDragOverReaction { return { accept: true, bubble: TreeDragOverBubble.Up, effect: ListDragOverEffect.Copy }; },
acceptCopyBubbleDown(autoExpand = false): ITreeDragOverReaction { return { accept: true, bubble: TreeDragOverBubble.Down, effect: ListDragOverEffect.Copy, autoExpand }; }
};
export interface ITreeDragAndDrop<T> extends IListDragAndDrop<T> {
onDragOver(data: IDragAndDropData, targetElement: T | undefined, targetIndex: number | undefined, originalEvent: DragEvent): boolean | ITreeDragOverReaction;
}
export class TreeError extends Error {
constructor(user: string, message: string) {
super(`TreeError [${user}] ${message}`);
}
}
export class WeakMapper<K extends object, V> {
constructor(private fn: (k: K) => V) { }
private _map = new WeakMap<K, V>();
map(key: K): V {
let result = this._map.get(key);
if (!result) {
result = this.fn(key);
this._map.set(key, result);
}
return result;
}
}