# 🍵 Vue Teatree

A simple treeview component for VueJS with no added dependencies.

![Animated](./readme/animated.gif)

- [🍵 Vue Teatree](#%f0%9f%8d%b5-vue-teatree)
  - [Install](#install)
  - [Example](#example)
  - [More details](#more-details)
    - [NodeType](#nodetype)
    - [NodeToggle](#nodetoggle)
    - [NodeName](#nodename)
  - [Styling](#styling)
    - [Teatree](#teatree)
    - [NodeToggle](#nodetoggle-1)
    - [NodeName](#nodename-1)
  - [Common use cases](#common-use-cases)
    - [Toggle everything shut](#toggle-everything-shut)
    - [Hide leaves](#hide-leaves)
    - [Show a right-click menu](#show-a-right-click-menu)

## Install

```bash
yarn add vue-teatree # (or use npm)
```

<https://www.npmjs.com/package/vue-teatree>

## Example

1. Import your components:

```ts
import { Teatree, NodeType, NodeName, NodeToggle } from "vue-teatree";
```

- `Teatree` is the main component you will pass your data to (below).
- `NodeType` contains the Typescript interface that defines each node type.
- `NodeName` is a pre-built component you will pass into a slot.
- `NodeToggle` is a pre-built component you will pass into a slot.

`NodeName` and `NodeToggle` are provided as a convenience. Feel free to write your own.

1. Prepare your data

```ts
const data: NodeType[] = [
  {
    name: "parent",
    show: true,
    showChildren: true,
    selected: false,
    children: [
      {
        name: "child",
        show: true,
        showChildren: true,
        selected: false,
        children: [
          {
            name: "grandchild",
            show: true,
            showChildren: true,
            selected: false,
            children: [],
          },
        ],
      },
    ],
  },
];
```

3. Pass it into Teatree

```html
<Teatree :roots="data">
  <template slot="node-toggle" slot-scope="{ node }">
    <NodeToggle :node="node" />
  </template>
  <template slot="node-name" slot-scope="{ node }">
    <NodeName
      :node="node"
      :handleNodeLeftClick="() => {}"
      :handleNodeRightClick="() => {}"
    />
  </template>
</Teatree>
```

## More details

1. The `Teatree` treeview is purely a function of your data. If you want to make changes to the treeview (e.g. toggling children, hiding nodes etc.) you should modify the data object.
2. `NodeToggle` and `NodeName` can be replaced with your own components and passed into the `node-toggle` and `node-name` slots respectively.

### NodeType

Teatree accepts an array of [`NodeType`](./src/types/NodeType.ts) as its `roots` prop. This means you can render multiple roots in the treeview.

```ts
interface NodeType {
  // show: toggling this will show/hide the node and its children
  show: boolean;
  // showChildren: toggling this will toggle its children
  showChildren: boolean;
  // selected: toggling this will apply the "selected" CSS style
  selected: boolean;
  // children: the children must also conform to the node specification
  children: Array<NodeType>;
  // name: the name of the node
  name: string;
  // icon: base64 encoded icon (optional)
  icon?: string;
  // data: payload by the user of the library (optional)
  data?: object;
}
```

### NodeToggle

It is a pre-built component to render the node's toggle. If you want to implement your own, take a look at the source code!

Props:

| Name   | Type       | Required | Notes |
| ------ | ---------- | -------- | ----- |
| `node` | `NodeType` | Yes      |       |

### NodeName

It is a pre-built component to render the node's name. If you want to implement your own, take a look at the source code!

It has a number of props that can be wired up to provide additional functionality (track clicks etc.):

| Name                   | Type                                  | Required | Notes                                                    |
| ---------------------- | ------------------------------------- | -------- | -------------------------------------------------------- |
| `node`                 | `NodeType`                            | Yes      |                                                          |
| `handleNodeLeftClick`  | `(event: any, node: NodeType) => any` | Yes      | Pass an empty function `() => {}` if you don't have one. |
| `handleNodeRightClick` | `(event: any, node: NodeType) => any` | Yes      | Pass an empty function `() => {}` if you don't have one. |

## Styling

Import default styles using: `@import "vue-teatree/build/Teatree.css";`

Here are all the default styles. Override them to your liking:

### Teatree

```css
.teatree {
  cursor: pointer;
  height: 100%;
  overflow: hidden;
}

.teatree-node {
  padding-right: 0.25rem;
}

.teatree-node-item {
  display: flex;
  align-items: center;
  height: 1.5rem;
  background: transparent;

  /* hack to make hover the full width of parent */
  padding-left: 100%;
  margin-left: -100%;
  padding-right: 100%;
  margin-right: -100%;
}

.teatree-node-item:hover {
  background-color: #718096;
}

.teatree-node-item-selected {
  background-color: #718096;
}

.teatree-node-item-name-padded-leaf {
  padding-left: 1.25rem;
}
```

### NodeToggle

```css
.teatree-node-item-icon {
  display: flex;
  align-items: center;
  margin-left: 0.5rem;
  color: #cbd5e0;
}
```

### NodeName

```css
.teatree-node-item-name {
  display: inline-block;
  font-size: 0.875rem;
  color: #a0aec0;
  margin-left: 0.5rem;
  user-select: none;

  /* truncate */
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.teatree-node-item-name-padded {
  padding-left: 1.5rem;
}
```

## Common use cases

The following code/advice is not well tested. Apologies for any errors.

### Toggle everything shut

You can achieve an effect similar to VSCode where you can toggle/collapse all nodes closed. You need to write a simple tree-traversal:

```ts
const toggleTreeClosed = (rootNode: NodeType) => {
  rootNode.showChildren = false;
  rootNode.children.forEach((child) => toggleTreeClosed(child));
};
```

### Hide leaves

If you're using the treeview for a file explorer, it might be useful to hide the leaves, and only show the parent directories. You can use the `show` node property to hide the leaf nodes.

```ts
const isLeaf = (node: NodeType) => {
  return !node.children.length;
};

const hideTreeLeaves = (rootNode: NodeType) => {
  if (isLeaf(rootNode)) {
    rootNode.show = false;
  } else {
    rootNode.children.forEach((child) => hideTreeLeaves(child));
  }
};
```

### Show a right-click menu

You'll need something like: <https://github.com/rawilk/vue-context>.

Use the `handleNodeRightClick` component prop to call the context menu:

```ts
export default class MyComponent extends Vue {
  handleNodeRightClick(node: NodeType, event: any) {
    this.$refs.menu.open(event, node);
  }
}
```

```html
<vue-context ref="menu">
  <template slot-scope="child">
    <your-menu-component :node="child.data" />
  </template>
</vue-context>
```