feat:add page zoom

index.html

@@ -121,12 +121,12 @@
         <span>页面：<span class="page-no">1</span>/<span class="page-size">1</span></span>
       </div>
       <div>
-        <div>
-          <i class="page-minus"></i>
+        <div class="page-scale-minus">
+          <i></i>
         </div>
-        <span>100%</span>
-        <div>
-          <i class="page-add"></i>
+        <span class="page-scale-percentage">100%</span>
+        <div class="page-scale-add">
+          <i></i>
         </div>
       </div>
     </div>

src/editor/core/command/Command.ts

@@ -24,6 +24,8 @@ export class Command {
   private static image: Function
   private static search: Function
   private static print: Function
+  private static pageScaleMinus: Function
+  private static pageScaleAdd: Function
 
   constructor(adapt: CommandAdapt) {
     Command.undo = adapt.undo.bind(adapt)
@@ -46,6 +48,8 @@ export class Command {
     Command.image = adapt.image.bind(adapt)
     Command.search = adapt.search.bind(adapt)
     Command.print = adapt.print.bind(adapt)
+    Command.pageScaleMinus = adapt.pageScaleMinus.bind(adapt)
+    Command.pageScaleAdd = adapt.pageScaleAdd.bind(adapt)
   }
 
   // 撤销、重做、格式刷、清除格式
@@ -131,4 +135,13 @@ export class Command {
     return Command.print()
   }
 
+  // 页面缩放
+  public executePageScaleMinus() {
+    return Command.pageScaleMinus()
+  }
+
+  public executePageScaleAdd() {
+    return Command.pageScaleAdd()
+  }
+
 }

src/editor/core/command/CommandAdapt.ts

@@ -262,4 +262,20 @@ export class CommandAdapt {
     return printImageBase64(this.draw.getDataURL(), width, height)
   }
 
+  public pageScaleMinus() {
+    const { scale } = this.options
+    const nextScale = scale * 10 - 1
+    if (nextScale >= 5) {
+      this.draw.setPageScale(nextScale / 10)
+    }
+  }
+
+  public pageScaleAdd() {
+    const { scale } = this.options
+    const nextScale = scale * 10 + 1
+    if (nextScale <= 30) {
+      this.draw.setPageScale(nextScale / 10)
+    }
+  }
+
 }

src/editor/core/cursor/Cursor.ts

@@ -7,6 +7,7 @@ import { CursorAgent } from "./CursorAgent"
 
 export class Cursor {
 
+  private draw: Draw
   private container: HTMLDivElement
   private options: Required<IEditorOption>
   private position: Position
@@ -14,6 +15,7 @@ export class Cursor {
   private cursorAgent: CursorAgent
 
   constructor(draw: Draw, canvasEvent: CanvasEvent) {
+    this.draw = draw
     this.container = draw.getContainer()
     this.position = draw.getPosition()
     this.options = draw.getOptions()
@@ -36,8 +38,10 @@ export class Cursor {
     const cursorPosition = this.position.getCursorPosition()
     if (!cursorPosition) return
     // 设置光标代理
+    const { scale } = this.options
+    const height = this.draw.getHeight()
+    const pageGap = this.draw.getPageGap()
     const { metrics, coordinate: { leftTop, rightTop }, ascent, pageNo } = cursorPosition
-    const { height, pageGap } = this.options
     const preY = pageNo * (height + pageGap)
     // 增加1/4字体大小
     const offsetHeight = metrics.height / 4
@@ -52,7 +56,7 @@ export class Cursor {
     const cursorTop = (leftTop[1] + ascent) + descent - (cursorHeight - offsetHeight) + preY
     const curosrleft = rightTop[0]
     agentCursorDom.style.left = `${curosrleft}px`
-    agentCursorDom.style.top = `${cursorTop + cursorHeight - CURSOR_AGENT_HEIGHT}px`
+    agentCursorDom.style.top = `${cursorTop + cursorHeight - CURSOR_AGENT_HEIGHT * scale}px`
     // 模拟光标显示
     this.cursorDom.style.left = `${curosrleft}px`
     this.cursorDom.style.top = `${cursorTop}px`

src/editor/core/draw/Draw.ts

@@ -49,7 +49,6 @@ export class Draw {
   private textParticle: TextParticle
   private pageNumber: PageNumber
 
-  private innerWidth: number
   private rowList: IRow[]
   private painterStyle: IElementStyle | null
   private searchMatchList: number[][] | null
@@ -93,8 +92,6 @@ export class Draw {
     const globalEvent = new GlobalEvent(this, canvasEvent)
     globalEvent.register()
 
-    const { width, margins } = options
-    this.innerWidth = width - margins[1] - margins[3]
     this.rowList = []
     this.painterStyle = null
     this.searchMatchList = null
@@ -104,6 +101,40 @@ export class Draw {
     this.render({ isSetCursor: false })
   }
 
+  public getWidth(): number {
+    return Math.floor(this.options.width * this.options.scale)
+  }
+
+  public getHeight(): number {
+    return Math.floor(this.options.height * this.options.scale)
+  }
+
+  public getInnerWidth(): number {
+    const width = this.getWidth()
+    const margins = this.getMargins()
+    return width - margins[1] - margins[3]
+  }
+
+  public getMargins(): number[] {
+    return this.options.margins.map(m => m * this.options.scale)
+  }
+
+  public getPageGap(): number {
+    return this.options.pageGap * this.options.scale
+  }
+
+  public getPageNumberBottom(): number {
+    return this.options.pageNumberBottom * this.options.scale
+  }
+
+  public getMarginIndicatorSize(): number {
+    return this.options.marginIndicatorSize * this.options.scale
+  }
+
+  public getDefaultBasicRowMarginHeight(): number {
+    return this.options.defaultBasicRowMarginHeight * this.options.scale
+  }
+
   public getContainer(): HTMLDivElement {
     return this.container
   }
@@ -222,9 +253,27 @@ export class Draw {
     })
   }
 
+  public setPageScale(payload: number) {
+    this.options.scale = payload
+    const width = this.getWidth()
+    const height = this.getHeight()
+    this.container.style.width = `${width}px`
+    this.pageList.forEach(p => {
+      p.width = width
+      p.height = height
+      p.style.width = `${width}px`
+      p.style.height = `${height}px`
+      p.style.marginBottom = `${this.getPageGap()}px`
+    })
+    this.render({ isSubmitHistory: false, isSetCursor: false })
+    if (this.listener.pageScaleChange) {
+      this.listener.pageScaleChange(payload)
+    }
+  }
+
   private _createPageContainer(): HTMLDivElement {
     // 容器宽度需跟随纸张宽度
-    this.container.style.width = `${this.options.width}px`
+    this.container.style.width = `${this.getWidth()}px`
     const pageContainer = document.createElement('div')
     pageContainer.classList.add('page-container')
     this.container.append(pageContainer)
@@ -232,16 +281,18 @@ export class Draw {
   }
 
   private _createPage(pageNo: number) {
+    const width = this.getWidth()
+    const height = this.getHeight()
     const canvas = document.createElement('canvas')
-    canvas.style.width = `${this.options.width}px`
-    canvas.style.height = `${this.options.height}px`
-    canvas.style.marginBottom = `${this.options.pageGap}px`
+    canvas.style.width = `${width}px`
+    canvas.style.height = `${height}px`
+    canvas.style.marginBottom = `${this.getPageGap()}px`
     canvas.setAttribute('data-index', String(pageNo))
     this.pageContainer.append(canvas)
     // 调整分辨率
     const dpr = window.devicePixelRatio
-    canvas.width = parseInt(canvas.style.width) * dpr
-    canvas.height = parseInt(canvas.style.height) * dpr
+    canvas.width = width * dpr
+    canvas.height = height * dpr
     canvas.style.cursor = 'text'
     const ctx = canvas.getContext('2d')!
     ctx.scale(dpr, dpr)
@@ -250,16 +301,17 @@ export class Draw {
     this.ctxList.push(ctx)
   }
 
-  private _getFont(el: IElement): string {
+  private _getFont(el: IElement, scale: number = 1): string {
     const { defaultSize, defaultFont } = this.options
-    return `${el.italic ? 'italic ' : ''}${el.bold ? 'bold ' : ''}${el.size || defaultSize}px ${el.font || defaultFont}`
+    return `${el.italic ? 'italic ' : ''}${el.bold ? 'bold ' : ''}${(el.size || defaultSize) * scale}px ${el.font || defaultFont}`
   }
 
   private _computeRowList() {
-    const { defaultSize, defaultRowMargin, defaultBasicRowMarginHeight } = this.options
+    const { defaultSize, defaultRowMargin, scale } = this.options
+    const innerWidth = this.getInnerWidth()
+    const defaultBasicRowMarginHeight = this.getDefaultBasicRowMarginHeight()
     const canvas = document.createElement('canvas')
     const ctx = canvas.getContext('2d') as CanvasRenderingContext2D
-    const innerWidth = this.innerWidth
     const rowList: IRow[] = []
     if (this.elementList.length) {
       rowList.push({
@@ -281,24 +333,30 @@ export class Draw {
         boundingBoxDescent: 0
       }
       if (element.type === ElementType.IMAGE) {
-        metrics.height = element.height!
+        const elementWidth = element.width! * scale
+        const elementHeight = element.height! * scale
         // 图片超出尺寸后自适应
-        if (curRow.width + element.width! > innerWidth) {
+        if (curRow.width + elementWidth > innerWidth) {
           // 计算剩余大小
           const surplusWidth = innerWidth - curRow.width
           element.width = surplusWidth
-          element.height = element.height! * surplusWidth / element.width
-        }
-        metrics.width = element.width!
-        metrics.boundingBoxAscent = 0
-        metrics.boundingBoxDescent = element.height!
+          element.height = elementHeight * surplusWidth / elementWidth
+          metrics.width = element.width
+          metrics.height = element.height
+          metrics.boundingBoxDescent = element.height
         } else {
-        metrics.height = element.size || this.options.defaultSize
+          metrics.width = elementWidth
+          metrics.height = elementHeight
+          metrics.boundingBoxDescent = elementHeight
+        }
+        metrics.boundingBoxAscent = 0
+      } else {
+        metrics.height = (element.size || this.options.defaultSize) * scale
         ctx.font = this._getFont(element)
         const fontMetrics = this.textParticle.measureText(ctx, element)
-        metrics.width = fontMetrics.width
-        metrics.boundingBoxAscent = element.value === ZERO ? defaultSize : fontMetrics.actualBoundingBoxAscent
-        metrics.boundingBoxDescent = fontMetrics.actualBoundingBoxDescent
+        metrics.width = fontMetrics.width * scale
+        metrics.boundingBoxAscent = (element.value === ZERO ? defaultSize : fontMetrics.actualBoundingBoxAscent) * scale
+        metrics.boundingBoxDescent = fontMetrics.actualBoundingBoxDescent * scale
       }
       const ascent = metrics.boundingBoxAscent + rowMargin
       const descent = metrics.boundingBoxDescent + rowMargin
@@ -306,7 +364,7 @@ export class Draw {
       const rowElement: IRowElement = {
         ...element,
         metrics,
-        style: ctx.font
+        style: this._getFont(element, scale)
       }
       // 超过限定宽度
       if (curRow.width + metrics.width > innerWidth || (i !== 0 && element.value === ZERO)) {
@@ -322,7 +380,7 @@ export class Draw {
         if (curRow.height < height) {
           curRow.height = height
           if (element.type === ElementType.IMAGE) {
-            curRow.ascent = element.height!
+            curRow.ascent = metrics.height
           } else {
             curRow.ascent = ascent
           }
@@ -334,7 +392,9 @@ export class Draw {
   }
 
   private _drawElement(positionList: IElementPosition[], rowList: IRow[], pageNo: number) {
-    const { margins, width, height } = this.options
+    const width = this.getWidth()
+    const height = this.getHeight()
+    const margins = this.getMargins()
     const ctx = this.ctxList[pageNo]
     ctx.clearRect(0, 0, width, height)
     // 绘制背景
@@ -361,7 +421,7 @@ export class Draw {
         const element = curRow.elementList[j]
         const metrics = element.metrics
         const offsetY = element.type === ElementType.IMAGE
-          ? curRow.ascent - element.height!
+          ? curRow.ascent - metrics.height
           : curRow.ascent
         const positionItem: IElementPosition = {
           pageNo,
@@ -430,6 +490,7 @@ export class Draw {
       isSetCursor = true,
       isComputeRowList = true
     } = payload || {}
+    const height = this.getHeight()
     // 计算行信息
     if (isComputeRowList) {
       this._computeRowList()
@@ -439,14 +500,14 @@ export class Draw {
     this.position.setPositionList([])
     const positionList = this.position.getPositionList()
     // 按页渲染
-    const { margins } = this.options
+    const margins = this.getMargins()
     const marginHeight = margins[0] + margins[2]
     let pageHeight = marginHeight
     let pageNo = 0
     let pageRowList: IRow[][] = [[]]
     for (let i = 0; i < this.rowList.length; i++) {
       const row = this.rowList[i]
-      if (row.height + pageHeight > this.options.height) {
+      if (row.height + pageHeight > height) {
         pageHeight = marginHeight + row.height
         pageRowList.push([row])
         pageNo++

src/editor/core/draw/frame/Margin.ts

@@ -3,15 +3,20 @@ import { Draw } from "../Draw"
 
 export class Margin {
 
+  private draw: Draw
   private options: Required<IEditorOption>
 
   constructor(draw: Draw) {
+    this.draw = draw
     this.options = draw.getOptions()
   }
 
   public render(ctx: CanvasRenderingContext2D) {
-    const { width, height } = this.options
-    const { marginIndicatorColor, marginIndicatorSize, margins } = this.options
+    const { marginIndicatorColor } = this.options
+    const width = this.draw.getWidth()
+    const height = this.draw.getHeight()
+    const margins = this.draw.getMargins()
+    const marginIndicatorSize = this.draw.getMarginIndicatorSize()
     ctx.save()
     ctx.strokeStyle = marginIndicatorColor
     ctx.beginPath()

src/editor/core/draw/frame/PageNumber.ts

@@ -3,17 +3,22 @@ import { Draw } from "../Draw"
 
 export class PageNumber {
 
+  private draw: Draw
   private options: Required<IEditorOption>
 
   constructor(draw: Draw) {
+    this.draw = draw
     this.options = draw.getOptions()
   }
 
   public render(ctx: CanvasRenderingContext2D, pageNo: number) {
-    const { pageNumberBottom, width, height } = this.options
+    const { pageNumberSize, pageNumberFont, scale } = this.options
+    const width = this.draw.getWidth()
+    const height = this.draw.getHeight()
+    const pageNumberBottom = this.draw.getPageNumberBottom()
     ctx.save()
     ctx.fillStyle = '#00000'
-    ctx.font = '12px'
+    ctx.font = `${pageNumberSize * scale}px ${pageNumberFont}`
     ctx.fillText(`${pageNo + 1}`, width / 2, height - pageNumberBottom)
     ctx.restore()
   }

src/editor/core/draw/particle/ImageParticle.ts

@@ -72,7 +72,9 @@ export class ImageParticle {
   private _handleMousedown(evt: MouseEvent) {
     this.canvas = this.draw.getPage()
     if (!this.curPosition || !this.curElement) return
-    const { height, pageGap } = this.options
+    const { scale } = this.options
+    const height = this.draw.getHeight()
+    const pageGap = this.draw.getPageGap()
     this.mousedownX = evt.x
     this.mousedownY = evt.y
     const target = evt.target as HTMLDivElement
@@ -88,8 +90,8 @@ export class ImageParticle {
     const prePageHeight = this.draw.getPageNo() * (height + pageGap)
     this.resizerImageContainer.style.left = `${left}px`
     this.resizerImageContainer.style.top = `${top + prePageHeight}px`
-    this.resizerImage.style.width = `${this.curElement.width}px`
-    this.resizerImage.style.height = `${this.curElement.height}px`
+    this.resizerImage.style.width = `${this.curElement.width! * scale}px`
+    this.resizerImage.style.height = `${this.curElement.height! * scale}px`
     // 追加全局事件
     const mousemoveFn = this._mousemove.bind(this)
     document.addEventListener('mousemove', mousemoveFn)
@@ -114,6 +116,7 @@ export class ImageParticle {
 
   private _mousemove(evt: MouseEvent) {
     if (!this.curElement) return
+    const { scale } = this.options
     let dx = 0
     let dy = 0
     switch (this.curHandleIndex) {
@@ -148,8 +151,8 @@ export class ImageParticle {
     }
     this.width = this.curElement.width! + dx
     this.height = this.curElement.height! + dy
-    this.resizerImage.style.width = `${this.width}px`
-    this.resizerImage.style.height = `${this.height}px`
+    this.resizerImage.style.width = `${this.width * scale}px`
+    this.resizerImage.style.height = `${this.height * scale}px`
     evt.preventDefault()
   }
 
@@ -158,36 +161,39 @@ export class ImageParticle {
   }
 
   public drawResizer(element: IElement, position: IElementPosition) {
+    const { scale } = this.options
     const { coordinate: { leftTop: [left, top] } } = position
-    const width = element.width!
-    const height = element.height!
+    const elementWidth = element.width! * scale
+    const elementHeight = element.height! * scale
+    const height = this.draw.getHeight()
+    const pageGap = this.draw.getPageGap()
     const handleSize = this.options.resizerSize
-    const preY = this.draw.getPageNo() * (this.options.height + this.options.pageGap)
+    const preY = this.draw.getPageNo() * (height + pageGap)
     // 边框
     this.resizerSelection.style.left = `${left}px`
     this.resizerSelection.style.top = `${top + preY}px`
-    this.resizerSelection.style.width = `${element.width}px`
-    this.resizerSelection.style.height = `${element.height}px`
+    this.resizerSelection.style.width = `${elementWidth}px`
+    this.resizerSelection.style.height = `${elementHeight}px`
     // handle
     for (let i = 0; i < 8; i++) {
       const left = i === 0 || i === 6 || i === 7
         ? -handleSize
         : i === 1 || i === 5
-          ? width / 2
-          : width - handleSize
+          ? elementWidth / 2
+          : elementWidth - handleSize
       const top = i === 0 || i === 1 || i === 2
         ? -handleSize
         : i === 3 || i === 7
-          ? height / 2 - handleSize
-          : height - handleSize
+          ? elementHeight / 2 - handleSize
+          : elementHeight - handleSize
       this.resizerHandleList[i].style.left = `${left}px`
       this.resizerHandleList[i].style.top = `${top}px`
     }
     this.resizerSelection.style.display = 'block'
     this.curElement = element
     this.curPosition = position
-    this.width = this.curElement.width!
-    this.height = this.curElement.height!
+    this.width = this.curElement.width! * scale
+    this.height = this.curElement.height! * scale
   }
 
   public clearResizer() {
@@ -195,8 +201,9 @@ export class ImageParticle {
   }
 
   public render(ctx: CanvasRenderingContext2D, element: IElement, x: number, y: number) {
-    const width = element.width!
-    const height = element.height!
+    const { scale } = this.options
+    const width = element.width! * scale
+    const height = element.height! * scale
     if (this.imageCache.has(element.id!)) {
       const img = this.imageCache.get(element.id!)!
       ctx.drawImage(img, x, y, width, height)

src/editor/core/listener/Listener.ts

@@ -1,5 +1,6 @@
 import {
   IIntersectionPageNoChange,
+  IPageScaleChange,
   IPageSizeChange,
   IRangeStyleChange,
   IVisiblePageNoListChange
@@ -11,12 +12,14 @@ export class Listener {
   public visiblePageNoListChange: IVisiblePageNoListChange | null
   public intersectionPageNoChange: IIntersectionPageNoChange | null
   public pageSizeChange: IPageSizeChange | null
+  public pageScaleChange: IPageScaleChange | null
 
   constructor() {
     this.rangeStyleChange = null
     this.visiblePageNoListChange = null
     this.intersectionPageNoChange = null
     this.pageSizeChange = null
+    this.pageScaleChange = null
   }
 
 }

src/editor/index.ts

@@ -24,8 +24,11 @@ export default class Editor {
       defaultBasicRowMarginHeight: 8,
       width: 794,
       height: 1123,
+      scale: 1,
       pageGap: 20,
       pageNumberBottom: 60,
+      pageNumberSize: 12,
+      pageNumberFont: 'Yahei',
       underlineColor: '#000000',
       strikeoutColor: '#FF0000',
       rangeAlpha: 0.6,

src/editor/interface/Editor.ts

@@ -6,8 +6,11 @@ export interface IEditorOption {
   defaultRowMargin?: number;
   width?: number;
   height?: number;
+  scale?: number;
   pageGap?: number;
   pageNumberBottom?: number;
+  pageNumberSize?: number;
+  pageNumberFont?: string;
   underlineColor?: string;
   strikeoutColor?: string;
   rangeColor?: string;

src/editor/interface/Listener.ts

@@ -22,3 +22,5 @@ export type IVisiblePageNoListChange = (payload: number[]) => void
 export type IIntersectionPageNoChange = (payload: number) => void
 
 export type IPageSizeChange = (payload: number) => void
+
+export type IPageScaleChange = (payload: number) => void

src/main.ts

@@ -231,6 +231,14 @@ window.onload = function () {
     console.log('print')
     instance.command.executePrint()
   }
+  document.querySelector<HTMLDivElement>('.page-scale-minus')!.onclick = function () {
+    console.log('page-scale-minus')
+    instance.command.executePageScaleMinus()
+  }
+  document.querySelector<HTMLDivElement>('.page-scale-add')!.onclick = function () {
+    console.log('page-scale-add')
+    instance.command.executePageScaleAdd()
+  }
 
   // 内部事件监听
   instance.listener.rangeStyleChange = function (payload) {
@@ -295,4 +303,8 @@ window.onload = function () {
     document.querySelector<HTMLSpanElement>('.page-no')!.innerText = `${payload + 1}`
   }
 
+  instance.listener.pageScaleChange = function (payload) {
+    document.querySelector<HTMLSpanElement>('.page-scale-percentage')!.innerText = `${Math.floor(payload * 100)}%`
+  }
+
 }

src/style.css

@@ -395,11 +395,14 @@ ul {
   cursor: pointer;
 }
 
-.footer>div:last-child .page-minus {
-  background-image: url('./assets/images/page-minus.svg');
-
+.footer .page-scale-minus i {
+  background-image: url('./assets/images/page-scale-minus.svg');
 }
 
-.footer>div:last-child .page-add {
-  background-image: url('./assets/images/page-add.svg');
+.footer .page-scale-add i {
+  background-image: url('./assets/images/page-scale-add.svg');
+}
+
+.footer .page-scale-percentage {
+  user-select: none;
 }