feat: add fontSize settings API

src/editor/core/command/Command.ts

@@ -22,6 +22,7 @@ export class Command {
   private static applyPainterStyle: CommandAdapt['applyPainterStyle']
   private static format: CommandAdapt['format']
   private static font: CommandAdapt['font']
+  private static sizeSet: CommandAdapt['sizeSet']
   private static sizeAdd: CommandAdapt['sizeAdd']
   private static sizeMinus: CommandAdapt['sizeMinus']
   private static bold: CommandAdapt['bold']
@@ -95,6 +96,7 @@ export class Command {
     Command.applyPainterStyle = adapt.applyPainterStyle.bind(adapt)
     Command.format = adapt.format.bind(adapt)
     Command.font = adapt.font.bind(adapt)
+    Command.sizeSet = adapt.sizeSet.bind(adapt)
     Command.sizeAdd = adapt.sizeAdd.bind(adapt)
     Command.sizeMinus = adapt.sizeMinus.bind(adapt)
     Command.bold = adapt.bold.bind(adapt)
@@ -205,11 +207,15 @@ export class Command {
     return Command.format()
   }
 
-  // 字体、字体变大、字体变小、加粗、斜体、下划线、删除线、字体颜色、背景色
+  // 字体、字体大小、字体变大、字体变小、加粗、斜体、下划线、删除线、字体颜色、背景色
   public executeFont(payload: string) {
     return Command.font(payload)
   }
 
+  public executeSize(size: number) {
+    return Command.sizeSet(size)
+  }
+
   public executeSizeAdd() {
     return Command.sizeAdd()
   }

src/editor/core/command/CommandAdapt.ts

@@ -185,6 +185,20 @@ export class CommandAdapt {
     this.draw.render({ isSetCursor: false })
   }
 
+  public sizeSet(size: number) {
+    const isReadonly = this.draw.isReadonly()
+    if (isReadonly) return
+    const selection = this.range.getSelection()
+    if (!selection) return
+    const lessThanMaxSizeIndex = selection.findIndex(s => !s.size || s.size + 2 <= 72)
+    if (!~lessThanMaxSizeIndex) return
+    selection.forEach(el => {
+      if (size > 72) return
+      el.size = size
+    })
+    this.draw.render({ isSetCursor: false })
+  }
+
   public sizeAdd() {
     const isReadonly = this.draw.isReadonly()
     if (isReadonly) return

src/editor/core/range/RangeManager.ts

@@ -135,6 +135,7 @@ export class RangeManager {
     const type = curElement.type || ElementType.TEXT
     // 富文本
     const font = curElement.font || this.options.defaultFont
+    const size = curElement.size || this.options.defaultSize
     const bold = !~curElementList.findIndex(el => !el.bold)
     const italic = !~curElementList.findIndex(el => !el.italic)
     const underline = !~curElementList.findIndex(el => !el.underline)
@@ -154,6 +155,7 @@ export class RangeManager {
       redo,
       painter,
       font,
+      size,
       bold,
       italic,
       underline,
@@ -169,6 +171,7 @@ export class RangeManager {
   public recoveryRangeStyle() {
     if (!this.listener.rangeStyleChange) return
     const font = this.options.defaultFont
+    const size = this.options.defaultSize
     const rowMargin = this.options.defaultRowMargin
     const painter = !!this.draw.getPainterStyle()
     const undo = this.historyManager.isCanUndo()
@@ -179,6 +182,7 @@ export class RangeManager {
       redo,
       painter,
       font,
+      size,
       bold: false,
       italic: false,
       underline: false,

src/editor/interface/Listener.ts

@@ -9,6 +9,7 @@ export interface IRangeStyle {
   redo: boolean;
   painter: boolean;
   font: string;
+  size: number;
   bold: boolean;
   italic: boolean;
   underline: boolean;