Class PreviewView

轻量级预览视图组件

用于在对话框中预览显示实体，不包含菜单、命令行等 UI。完全独立于主视图，不依赖 Engine 全局状态。

Example

const preview = new PreviewView({ backgroundColor: 0x2d3748 });
dialogContent.appendChild(preview);

const line = new LineEnt(new Point2D(0, 0), new Point2D(100, 100));
preview.addEntity(line);
preview.zoomExtents();

Hierarchy (View Summary)

LitElement
- PreviewView

Constructors

constructor

new PreviewView(config?: PreviewViewConfig): PreviewView
Parameters
- Optionalconfig: PreviewViewConfig
Returns PreviewView
Overrides LitElement.constructor
- Defined in ui/PreviewView.ts:130

Properties

`Static`styles

styles: r = ...

renderRoot

renderRoot: any

Accessors

zoom

get zoom(): number
获取当前缩放比例

Returns number
- Defined in ui/PreviewView.ts:624

viewCenter

get viewCenter(): Point2D
获取当前视图中心

Returns Point2D
- Defined in ui/PreviewView.ts:631

document

get document(): CadDocument
获取已加载的文档

Returns CadDocument
- Defined in ui/PreviewView.ts:638

`Static`observedAttributes

get observedAttributes(): any[]
Returns any[]
Inherited from LitElement.observedAttributes
- Defined in vendor/lit-element-base.ts:103

updateComplete

get updateComplete(): any
Returns any
Inherited from LitElement.updateComplete
- Defined in vendor/lit-element-base.ts:306

Methods

firstUpdated

firstUpdated(): Promise<void>
Returns Promise<void>
Overrides LitElement.firstUpdated
- Defined in ui/PreviewView.ts:144

onLoad

onLoad(): Promise<void>

等待组件初始化完成

Returns Promise<void>

Promise，初始化完成后 resolve

Example

const preview = new PreviewView();
container.appendChild(preview);
await preview.onLoad();  // 等待初始化完成
preview.addEntity(entity);

forceResize

forceResize(): void
强制重新计算尺寸并全图显示

Returns void
- Defined in ui/PreviewView.ts:450

addEntity

addEntity(entity: EntityBase, color?: number): void
添加单个实体到预览
Parameters
- entity: EntityBase
  要预览的实体
- Optionalcolor: number
  绘制颜色（可选，默认使用配置中的默认颜色）
Returns void
- Defined in ui/PreviewView.ts:478

addEntities

addEntities(entities: EntityBase[], color?: number): void
批量添加实体到预览
Parameters
- entities: EntityBase[]
  要预览的实体数组
- Optionalcolor: number
  绘制颜色（可选）
Returns void
- Defined in ui/PreviewView.ts:510

clear

clear(): void
清空所有实体

Returns void
- Defined in ui/PreviewView.ts:548

zoomExtents

zoomExtents(): void
全图显示

Returns void
- Defined in ui/PreviewView.ts:562

setView

setView(center: Point2D, zoom: number): void
设置视图中心和缩放
Parameters
- center: Point2D
  视图中心点
- zoom: number
  缩放比例
Returns void
- Defined in ui/PreviewView.ts:615

loadDocument

loadDocument(dbDocument: any, blockName?: string): Promise<void>
从文档数据加载并显示
Parameters
- dbDocument: any
  文档 JSON 数据（与 CadDocument.fromDb 格式相同）
- blockName: string = "*Model"
  要显示的块名，默认 "*Model"
Returns Promise<void>
- Defined in ui/PreviewView.ts:647

renderEntitiesDirect

renderEntitiesDirect(entities: EntityBase[], backgroundGray?: number): void
直接渲染内存中已有的实体（不做 toDb/fromDb）。使用当前活动文档的图层、线型等上下文，因此 InsertEnt 的嵌套实体已经构建好，渲染速度与主视图一致。
Parameters
- entities: EntityBase[]
  要渲染的实体数组（来自当前文档）
- OptionalbackgroundGray: number
  背景灰度值（0=黑色, 255=白色），用于 colorIndex 7 的反色处理
Returns void
- Defined in ui/PreviewView.ts:716

toThumbnail

toThumbnail(width?: number, height?: number, format?: "png" | "jpeg"): string
导出当前预览为缩略图
Parameters
- width: number = 128
  目标宽度（默认 128）
- height: number = 128
  目标高度（默认 128）
- format: "png" | "jpeg" = 'png'
  图像格式 'png' | 'jpeg'
Returns string
base64 编码的图像数据
- Defined in ui/PreviewView.ts:989

getEntityBounds

getEntityBounds(): BoundingBox
获取实体边界框

Returns BoundingBox
- Defined in ui/PreviewView.ts:1016

disconnectedCallback

disconnectedCallback(): void
销毁组件

Returns void
Overrides LitElement.disconnectedCallback
- Defined in ui/PreviewView.ts:1028

render

render(): { _$litType$: any; strings: any; values: any[] }
Returns { _$litType$: any; strings: any; values: any[] }
Overrides LitElement.render
- Defined in ui/PreviewView.ts:1068

`Static`addInitializer

addInitializer(t: any): void
Parameters
- t: any
Returns void
Inherited from LitElement.addInitializer
- Defined in vendor/lit-element-base.ts:100

`Static`createProperty

createProperty(
    t: any,
    e?: {
        attribute: boolean;
        type: StringConstructor;
        converter: {
            toAttribute(t: any, e: any): any;
            fromAttribute(t: any, e: any): any;
        };
        reflect: boolean;
        hasChanged: (t: any, e: any) => boolean;
    },
): void
Parameters
- t: any
- e: {
      attribute: boolean;
      type: StringConstructor;
      converter: {
          toAttribute(t: any, e: any): any;
          fromAttribute(t: any, e: any): any;
      };
      reflect: boolean;
      hasChanged: (t: any, e: any) => boolean;
  } = y
Returns void
Inherited from LitElement.createProperty
- Defined in vendor/lit-element-base.ts:106

`Static`getPropertyDescriptor

getPropertyDescriptor(
    t: any,
    e: any,
    s: any,
): {
    get(): any;
    set(e: any): void;
    configurable: boolean;
    enumerable: boolean;
}
Parameters
- t: any
- e: any
- s: any
Returns { get(): any; set(e: any): void; configurable: boolean; enumerable: boolean }
Inherited from LitElement.getPropertyDescriptor
- Defined in vendor/lit-element-base.ts:113

`Static`getPropertyOptions

getPropertyOptions(t: any): any
Parameters
- t: any
Returns any
Inherited from LitElement.getPropertyOptions
- Defined in vendor/lit-element-base.ts:137

`Static`_$Ei

_$Ei(): void
Returns void
Inherited from LitElement._$Ei
- Defined in vendor/lit-element-base.ts:140

`Static`finalize

finalize(): void
Returns void
Inherited from LitElement.finalize
- Defined in vendor/lit-element-base.ts:145

`Static`finalizeStyles

finalizeStyles(t: any): any[]
Parameters
- t: any
Returns any[]
Inherited from LitElement.finalizeStyles
- Defined in vendor/lit-element-base.ts:165

`Static`_$Eu

_$Eu(t: any, e: any): string
Parameters
- t: any
- e: any
Returns string
Inherited from LitElement._$Eu
- Defined in vendor/lit-element-base.ts:173

_$Ev

_$Ev(): void
Returns void
Inherited from LitElement._$Ev
- Defined in vendor/lit-element-base.ts:180

addController

addController(t: any): void
Parameters
- t: any
Returns void
Inherited from LitElement.addController
- Defined in vendor/lit-element-base.ts:184

removeController

removeController(t: any): void
Parameters
- t: any
Returns void
Inherited from LitElement.removeController
- Defined in vendor/lit-element-base.ts:188

_$E_

_$E_(): void
Returns void
Inherited from LitElement._$E_
- Defined in vendor/lit-element-base.ts:192

enableUpdating

enableUpdating(t: any): void
Parameters
- t: any
Returns void
Inherited from LitElement.enableUpdating
- Defined in vendor/lit-element-base.ts:217

attributeChangedCallback

attributeChangedCallback(t: any, e: any, s: any): void
Parameters
- t: any
- e: any
- s: any
Returns void
Inherited from LitElement.attributeChangedCallback
- Defined in vendor/lit-element-base.ts:225

_$EC

_$EC(t: any, e: any): void
Parameters
- t: any
- e: any
Returns void
Inherited from LitElement._$EC
- Defined in vendor/lit-element-base.ts:228

_$AK

_$AK(t: any, e: any): void
Parameters
- t: any
- e: any
Returns void
Inherited from LitElement._$AK
- Defined in vendor/lit-element-base.ts:237

requestUpdate

requestUpdate(t?: any, e?: any, s?: any): void
Parameters
- Optionalt: any
- Optionale: any
- Optionals: any
Returns void
Inherited from LitElement.requestUpdate
- Defined in vendor/lit-element-base.ts:249

P

P(t: any, e: any, s: any): void
Parameters
- t: any
- e: any
- s: any
Returns void
Inherited from LitElement.P
- Defined in vendor/lit-element-base.ts:255

_$ET

_$ET(): Promise<boolean>
Returns Promise<boolean>
Inherited from LitElement._$ET
- Defined in vendor/lit-element-base.ts:258

scheduleUpdate

scheduleUpdate(): void
Returns void
Inherited from LitElement.scheduleUpdate
- Defined in vendor/lit-element-base.ts:268

performUpdate

performUpdate(): void
Returns void
Inherited from LitElement.performUpdate
- Defined in vendor/lit-element-base.ts:271

willUpdate

willUpdate(t: any): void
Parameters
- t: any
Returns void
Inherited from LitElement.willUpdate
- Defined in vendor/lit-element-base.ts:295

_$AE

_$AE(t: any): void
Parameters
- t: any
Returns void
Inherited from LitElement._$AE
- Defined in vendor/lit-element-base.ts:296

_$EU

_$EU(): void
Returns void
Inherited from LitElement._$EU
- Defined in vendor/lit-element-base.ts:303

getUpdateComplete

getUpdateComplete(): any
Returns any
Inherited from LitElement.getUpdateComplete
- Defined in vendor/lit-element-base.ts:309

shouldUpdate

shouldUpdate(t: any): boolean
Parameters
- t: any
Returns boolean
Inherited from LitElement.shouldUpdate
- Defined in vendor/lit-element-base.ts:312

updated

updated(t: any): void
Parameters
- t: any
Returns void
Inherited from LitElement.updated
- Defined in vendor/lit-element-base.ts:318

createRenderRoot

createRenderRoot(): ShadowRoot
Returns ShadowRoot
Inherited from LitElement.createRenderRoot
- Defined in vendor/lit-element-base.ts:640

update

update(t: any): void
Parameters
- t: any
Returns void
Inherited from LitElement.update
- Defined in vendor/lit-element-base.ts:645

connectedCallback

connectedCallback(): void
Returns void
Inherited from LitElement.connectedCallback
- Defined in vendor/lit-element-base.ts:657

Class PreviewView

Example

Hierarchy (View Summary)

Index

Constructors

Properties

Accessors

Methods

Constructors

constructor

Parameters

Returns PreviewView

Properties

Staticstyles

renderRoot

Accessors

zoom

Returns number

viewCenter

Returns Point2D

document

Returns CadDocument

StaticobservedAttributes

Returns any[]

updateComplete

Returns any

Methods

firstUpdated

Returns Promise<void>

onLoad

Returns Promise<void>

Example

forceResize

Returns void

addEntity

Parameters

Returns void

addEntities

Parameters

Returns void

clear

Returns void

zoomExtents

Returns void

setView

Parameters

Returns void

loadDocument

Parameters

Returns Promise<void>

renderEntitiesDirect

Parameters

Returns void

toThumbnail

Parameters

Returns string

getEntityBounds

Returns BoundingBox

disconnectedCallback

Returns void

render

Returns { _$litType$: any; strings: any; values: any[] }

StaticaddInitializer

Parameters

Returns void

StaticcreateProperty

Parameters

Returns void

StaticgetPropertyDescriptor

Parameters

Returns { get(): any; set(e: any): void; configurable: boolean; enumerable: boolean }

StaticgetPropertyOptions

Parameters

Returns any

Static_$Ei

Returns void

Staticfinalize

Returns void

StaticfinalizeStyles

Parameters

`Static`styles

`Static`observedAttributes

`Static`addInitializer

`Static`createProperty

`Static`getPropertyDescriptor

`Static`getPropertyOptions

`Static`_$Ei

`Static`finalize

`Static`finalizeStyles

`Static`_$Eu