feat:选区样式变化监听

src/editor/core/cursor/Cursor.ts

@@ -36,7 +36,7 @@ export class Cursor {
   public setCursorPosition(evt: MouseEvent) {
     const positionIndex = this.position.getPositionByXY(evt.offsetX, evt.offsetY)
     if (~positionIndex) {
-      this.range.setRange(0, 0)
+      this.range.setRange(positionIndex, positionIndex)
       setTimeout(() => {
         this.draw.render({ curIndex: positionIndex, isSubmitHistory: false })
       })

src/editor/core/draw/Draw.ts

@@ -8,6 +8,7 @@ import { Cursor } from "../cursor/Cursor"
 import { CanvasEvent } from "../event/CanvasEvent"
 import { GlobalEvent } from "../event/GlobalEvent"
 import { HistoryManager } from "../history/HistoryManager"
+import { Listener } from "../listener/Listener"
 import { Position } from "../position/Position"
 import { RangeManager } from "../range/RangeManager"
 import { Background } from "./Background"
@@ -24,6 +25,7 @@ export class Draw {
   private options: Required<IEditorOption>
   private position: Position
   private elementList: IElement[]
+  private listener: Listener
 
   private cursor: Cursor
   private range: RangeManager
@@ -39,11 +41,18 @@ export class Draw {
   private painterStyle: IElementStyle | null
   private searchMatchList: number[][] | null
 
-  constructor(canvas: HTMLCanvasElement, ctx: CanvasRenderingContext2D, options: Required<IEditorOption>, elementList: IElement[]) {
+  constructor(
+    canvas: HTMLCanvasElement,
+    ctx: CanvasRenderingContext2D,
+    options: Required<IEditorOption>,
+    elementList: IElement[],
+    listener: Listener
+  ) {
     this.canvas = canvas
     this.ctx = ctx
     this.options = options
     this.elementList = elementList
+    this.listener = listener
 
     this.historyManager = new HistoryManager()
     this.position = new Position(this)
@@ -64,6 +73,8 @@ export class Draw {
     this.rowCount = 0
     this.painterStyle = null
     this.searchMatchList = null
+
+    this.setDefaultRange()
   }
 
   public getOptions(): Required<IEditorOption> {
@@ -86,6 +97,10 @@ export class Draw {
     return this.elementList
   }
 
+  public getListener(): Listener {
+    return this.listener
+  }
+
   public getCursor(): Cursor {
     return this.cursor
   }
@@ -117,6 +132,15 @@ export class Draw {
     this.searchMatchList = payload
   }
 
+  private setDefaultRange() {
+    if (!this.elementList.length) return
+    setTimeout(() => {
+      const curIndex = this.elementList.length - 1
+      this.range.setRange(curIndex, curIndex)
+      this.range.setRangeStyle()
+    })
+  }
+
   private getFont(el: IElement): string {
     const { defaultSize, defaultFont } = this.options
     return `${el.italic ? 'italic ' : ''}${el.bold ? 'bold ' : ''}${el.size || defaultSize}px ${el.font || defaultFont}`
@@ -223,8 +247,8 @@ export class Draw {
         this.ctx.fillText(element.value, x, y + curRow.ascent)
         // 选区绘制
         const { startIndex, endIndex } = this.range.getRange()
-        if (startIndex < index && index <= endIndex) {
-          this.range.drawRange(x, y, metrics.width, curRow.height)
+        if (startIndex !== endIndex && startIndex < index && index <= endIndex) {
+          this.range.render(x, y, metrics.width, curRow.height)
         }
         index++
         x += metrics.width

src/editor/core/event/CanvasEvent.ts

@@ -115,8 +115,9 @@ export class CanvasEvent {
       } else {
         elementList.splice(index, 1)
       }
-      this.range.setRange(0, 0)
-      this.draw.render({ curIndex: isCollspace ? index - 1 : startIndex })
+      const curIndex = isCollspace ? index - 1 : startIndex
+      this.range.setRange(curIndex, curIndex)
+      this.draw.render({ curIndex })
     } else if (evt.key === KeyMap.Enter) {
       const enterText: IElement = {
         value: ZERO
@@ -126,17 +127,20 @@ export class CanvasEvent {
       } else {
         elementList.splice(startIndex + 1, endIndex - startIndex, enterText)
       }
-      this.range.setRange(0, 0)
-      this.draw.render({ curIndex: index + 1 })
+      const curIndex = index + 1
+      this.range.setRange(curIndex, curIndex)
+      this.draw.render({ curIndex })
     } else if (evt.key === KeyMap.Left) {
       if (index > 0) {
-        this.range.setRange(0, 0)
-        this.draw.render({ curIndex: index - 1, isSubmitHistory: false })
+        const curIndex = index - 1
+        this.range.setRange(curIndex, curIndex)
+        this.draw.render({ curIndex, isSubmitHistory: false })
       }
     } else if (evt.key === KeyMap.Right) {
       if (index < position.length - 1) {
-        this.range.setRange(0, 0)
-        this.draw.render({ curIndex: index + 1, isSubmitHistory: false })
+        const curIndex = index + 1
+        this.range.setRange(curIndex, curIndex)
+        this.draw.render({ curIndex, isSubmitHistory: false })
       }
     } else if (evt.key === KeyMap.Up || evt.key === KeyMap.Down) {
       const { rowNo, index, coordinate: { leftTop, rightTop } } = cursorPosition
@@ -171,8 +175,9 @@ export class CanvasEvent {
             maxIndex = position.index
           }
         }
-        this.range.setRange(0, 0)
-        this.draw.render({ curIndex: maxIndex, isSubmitHistory: false })
+        const curIndex = maxIndex
+        this.range.setRange(curIndex, curIndex)
+        this.draw.render({ curIndex, isSubmitHistory: false })
       }
     } else if (evt.ctrlKey && evt.key === KeyMap.Z) {
       this.historyManager.undo()
@@ -188,8 +193,9 @@ export class CanvasEvent {
       if (!isCollspace) {
         writeText(position.slice(startIndex + 1, endIndex + 1).map(p => p.value).join(''))
         elementList.splice(startIndex + 1, endIndex - startIndex)
-        this.range.setRange(0, 0)
-        this.draw.render({ curIndex: startIndex })
+        const curIndex = startIndex
+        this.range.setRange(curIndex, curIndex)
+        this.draw.render({ curIndex })
       }
     } else if (evt.ctrlKey && evt.key === KeyMap.A) {
       this.range.setRange(0, position.length - 1)
@@ -215,8 +221,9 @@ export class CanvasEvent {
     } else {
       elementList.splice(startIndex + 1, endIndex - startIndex, ...inputData)
     }
-    this.range.setRange(0, 0)
-    this.draw.render({ curIndex: (isCollspace ? index : startIndex) + inputData.length })
+    const curIndex = (isCollspace ? index : startIndex) + inputData.length
+    this.range.setRange(curIndex, curIndex)
+    this.draw.render({ curIndex })
   }
 
   public paste(evt: ClipboardEvent) {

src/editor/core/event/GlobalEvent.ts

@@ -2,6 +2,7 @@ import { EDITOR_COMPONENT } from "../../dataset/constant/Editor"
 import { findParent } from "../../utils"
 import { Cursor } from "../cursor/Cursor"
 import { Draw } from "../draw/Draw"
+import { RangeManager } from "../range/RangeManager"
 import { CanvasEvent } from "./CanvasEvent"
 
 export class GlobalEvent {
@@ -10,12 +11,14 @@ export class GlobalEvent {
   private draw: Draw
   private cursor: Cursor | null
   private canvasEvent: CanvasEvent
+  private range: RangeManager
 
   constructor(canvas: HTMLCanvasElement, draw: Draw, canvasEvent: CanvasEvent) {
     this.canvas = canvas
     this.draw = draw
     this.canvasEvent = canvasEvent
     this.cursor = null
+    this.range = draw.getRange()
   }
 
   register() {
@@ -23,10 +26,11 @@ export class GlobalEvent {
 
     document.addEventListener('click', (evt) => {
       this.recoverCursor(evt)
+      this.setRangeStyle()
     })
 
     document.addEventListener('mouseup', () => {
-      this.updateDragState()
+      this.setDragState()
     })
   }
 
@@ -46,8 +50,12 @@ export class GlobalEvent {
     this.cursor.recoveryCursor()
   }
 
-  updateDragState() {
+  setDragState() {
     this.canvasEvent.setIsAllowDrag(false)
   }
 
+  setRangeStyle() {
+    this.range.setRangeStyle()
+  }
+
 }

src/editor/core/history/HistoryManager.ts

@@ -4,7 +4,7 @@ export class HistoryManager {
   private undoStack: Array<Function> = []
   private redoStack: Array<Function> = []
 
-  undo() {
+  public undo() {
     if (this.undoStack.length > 1) {
       const pop = this.undoStack.pop()!
       this.redoStack.push(pop)
@@ -14,7 +14,7 @@ export class HistoryManager {
     }
   }
 
-  redo() {
+  public redo() {
     if (this.redoStack.length) {
       const pop = this.redoStack.pop()!
       this.undoStack.push(pop)
@@ -22,7 +22,7 @@ export class HistoryManager {
     }
   }
 
-  execute(fn: Function) {
+  public execute(fn: Function) {
     this.undoStack.push(fn)
     if (this.redoStack.length) {
       this.redoStack = []
@@ -32,4 +32,12 @@ export class HistoryManager {
     }
   }
 
+  public isCanUndo(): boolean {
+    return this.undoStack.length > 1
+  }
+
+  public isCanRedo(): boolean {
+    return !!this.redoStack.length
+  }
+
 }

src/editor/core/listener/Listener.ts

@@ -0,0 +1,11 @@
+import { IRangeStyleChange } from "../../interface/Listener"
+
+export class Listener {
+
+  public rangeStyleChange: IRangeStyleChange | null
+
+  constructor() {
+    this.rangeStyleChange = null
+  }
+
+}

src/editor/core/range/RangeManager.ts

@@ -2,6 +2,8 @@ import { IEditorOption } from "../../interface/Editor"
 import { IElement } from "../../interface/Element"
 import { IRange } from "../../interface/Range"
 import { Draw } from "../draw/Draw"
+import { HistoryManager } from "../history/HistoryManager"
+import { Listener } from "../listener/Listener"
 
 export class RangeManager {
 
@@ -9,11 +11,15 @@ export class RangeManager {
   private options: Required<IEditorOption>
   private range: IRange
   private draw: Draw
+  private listener: Listener
+  private historyManager: HistoryManager
 
   constructor(ctx: CanvasRenderingContext2D, options: Required<IEditorOption>, draw: Draw) {
     this.ctx = ctx
     this.options = options
     this.draw = draw
+    this.listener = draw.getListener()
+    this.historyManager = draw.getHistoryManager()
     this.range = {
       startIndex: 0,
       endIndex: 0
@@ -36,15 +42,45 @@ export class RangeManager {
     this.range.endIndex = endIndex
   }
 
-  public drawRange(x: number, y: number, width: number, height: number) {
-    const { startIndex, endIndex } = this.range
-    if (startIndex !== endIndex) {
-      this.ctx.save()
-      this.ctx.globalAlpha = this.options.rangeAlpha
-      this.ctx.fillStyle = this.options.rangeColor
-      this.ctx.fillRect(x, y, width, height)
-      this.ctx.restore()
+  public setRangeStyle() {
+    if (!this.listener.rangeStyleChange) return
+    let curElementList = this.getSelection()
+    if (!curElementList) {
+      const elementList = this.draw.getElementList()
+      const { endIndex } = this.range
+      curElementList = [elementList[endIndex]]
     }
+    const curElement = curElementList[curElementList.length - 1]
+    // 富文本
+    let bold = !~curElementList.findIndex(el => !el.bold)
+    let italic = !~curElementList.findIndex(el => !el.italic)
+    let underline = !~curElementList.findIndex(el => !el.underline)
+    let strikeout = !~curElementList.findIndex(el => !el.strikeout)
+    const color = curElement.color || null
+    const highlight = curElement.highlight || null
+    // 菜单
+    const format = !!this.draw.getPainterStyle()
+    const undo = this.historyManager.isCanUndo()
+    const redo = this.historyManager.isCanRedo()
+    this.listener.rangeStyleChange({
+      undo,
+      redo,
+      format,
+      bold,
+      italic,
+      underline,
+      strikeout,
+      color,
+      highlight
+    })
+  }
+
+  public render(x: number, y: number, width: number, height: number) {
+    this.ctx.save()
+    this.ctx.globalAlpha = this.options.rangeAlpha
+    this.ctx.fillStyle = this.options.rangeColor
+    this.ctx.fillRect(x, y, width, height)
+    this.ctx.restore()
   }
 
 }

src/editor/index.ts

@@ -5,10 +5,12 @@ import { IElement } from './interface/Element'
 import { Draw } from './core/draw/Draw'
 import { Command } from './core/command/Command'
 import { CommandAdapt } from './core/command/CommandAdapt'
+import { Listener } from './core/listener/Listener'
 
 export default class Editor {
 
   public command: Command
+  public listener: Listener
 
   constructor(canvas: HTMLCanvasElement, elementList: IElement[], options: IEditorOption = {}) {
     const editorOptions: Required<IEditorOption> = {
@@ -43,10 +45,12 @@ export default class Editor {
         text.value = ZERO
       }
     })
+    // 监听
+    this.listener = new Listener()
     // 启动
-    const draw = new Draw(canvas, ctx, editorOptions, elementList)
+    const draw = new Draw(canvas, ctx, editorOptions, elementList, this.listener)
     draw.render()
-    // 对外命令
+    // 命令
     this.command = new Command(new CommandAdapt(draw))
   }
 

src/editor/interface/Listener.ts

@@ -0,0 +1,13 @@
+export interface IRangeStype {
+  undo: boolean;
+  redo: boolean;
+  format: boolean;
+  bold: boolean;
+  italic: boolean;
+  underline: boolean;
+  strikeout: boolean;
+  color: string | null;
+  highlight: string | null;
+}
+
+export type IRangeStyleChange = (payload: IRangeStype) => void;

src/main.ts

@@ -130,4 +130,9 @@ window.onload = function () {
     instance.command.executePrint()
   }
 
+  // 内部事件监听
+  instance.listener.rangeStyleChange = function (payload) {
+    console.log('payload: ', payload);
+  }
+
 }