|
| 1 | +--- |
| 2 | +title: canvas - 画布 API |
| 3 | +sidebar_position: 12 |
| 4 | +--- |
| 5 | + |
| 6 | +> **@types** [IPublicApiCanvas](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/api/canvas.ts)<br/> |
| 7 | +> **@since** v1.1.0 |
| 8 | +
|
| 9 | + |
| 10 | +## 模块简介 |
| 11 | + |
| 12 | +通过该模块可以触达对画布拖拽相关的一些能力。 |
| 13 | + |
| 14 | +## 变量 |
| 15 | + |
| 16 | +### dragon |
| 17 | + |
| 18 | +获取拖拽操作对象的实例 |
| 19 | + |
| 20 | +`@type {IPublicModelDragon | null}` |
| 21 | + |
| 22 | + |
| 23 | +相关类型:[IPublicModelDragon](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/dragon.ts) |
| 24 | + |
| 25 | +### activeTracker |
| 26 | + |
| 27 | +获取活动追踪器实例 |
| 28 | + |
| 29 | +`@type {IPublicModelActiveTracker | null}` |
| 30 | + |
| 31 | +相关类型:[IPublicModelActiveTracker](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/active-tracker.ts) |
| 32 | + |
| 33 | +### isInLiveEditing |
| 34 | + |
| 35 | +是否处于 LiveEditing 状态 |
| 36 | + |
| 37 | +`@type {boolean}` |
| 38 | + |
| 39 | +### clipboard |
| 40 | +全局剪贴板实例 |
| 41 | + |
| 42 | +`@type {IPublicModelClipboard}` |
| 43 | + |
| 44 | +相关类型:[IPublicModelClipboard](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/clipboard.ts) |
| 45 | + |
| 46 | +## 方法 |
| 47 | + |
| 48 | +### createLocation |
| 49 | +创建一个文档插入位置对象,该对象用来描述一个即将插入的节点在文档中的位置 |
| 50 | + |
| 51 | +```typescript |
| 52 | +/** |
| 53 | + * 创建一个文档插入位置对象,该对象用来描述一个即将插入的节点在文档中的位置 |
| 54 | + * create a drop location for document, drop location describes a location in document |
| 55 | + * @since v1.1.0 |
| 56 | + */ |
| 57 | +createLocation(locationData: IPublicTypeLocationData): IPublicModelDropLocation; |
| 58 | +``` |
| 59 | + |
| 60 | +### createScroller |
| 61 | +创建一个滚动控制器 Scroller,赋予一个视图滚动的基本能力, |
| 62 | +```typescript |
| 63 | +/** |
| 64 | + * 创建一个滚动控制器 Scroller,赋予一个视图滚动的基本能力, |
| 65 | + * a Scroller is a controller that gives a view (IPublicTypeScrollable) the ability scrolling |
| 66 | + * to some cordination by api scrollTo. |
| 67 | + * |
| 68 | + * when a scroller is inited, will need to pass is a scrollable, which has a scrollTarget. |
| 69 | + * and when scrollTo(options: { left?: number; top?: number }) is called, scroller will |
| 70 | + * move scrollTarget`s top-left corner to (options.left, options.top) that passed in. |
| 71 | + * @since v1.1.0 |
| 72 | + */ |
| 73 | +createScroller(scrollable: IPublicTypeScrollable): IPublicModelScroller; |
| 74 | + |
| 75 | +``` |
| 76 | + |
| 77 | +### createScrollTarget |
| 78 | +创建一个 ScrollTarget,与 Scroller 一起发挥作用,详见 [createScroller](#createscroller) 中的描述 |
| 79 | + |
| 80 | +```typescript |
| 81 | +/** |
| 82 | + * 创建一个 ScrollTarget,与 Scroller 一起发挥作用,详见 createScroller 中的描述 |
| 83 | + * this works with Scroller, refer to createScroller`s description |
| 84 | + * @since v1.1.0 |
| 85 | + */ |
| 86 | +createScrollTarget(shell: HTMLDivElement): IPublicModelScrollTarget; |
| 87 | +``` |
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