Introduce some functional programming techniques

src/file/drawing/floating/floating-position.ts

@@ -39,22 +39,22 @@ export enum VerticalPositionAlign {
 }
 
 export interface IHorizontalPositionOptions {
-    relative: HorizontalPositionRelativeFrom;
-    align?: HorizontalPositionAlign;
-    offset?: number;
+    readonly relative: HorizontalPositionRelativeFrom;
+    readonly align?: HorizontalPositionAlign;
+    readonly offset?: number;
 }
 
 export interface IVerticalPositionOptions {
-    relative: VerticalPositionRelativeFrom;
-    align?: VerticalPositionAlign;
-    offset?: number;
+    readonly relative: VerticalPositionRelativeFrom;
+    readonly align?: VerticalPositionAlign;
+    readonly offset?: number;
 }
 
 export interface IFloating {
-    horizontalPosition: IHorizontalPositionOptions;
-    verticalPosition: IVerticalPositionOptions;
-    allowOverlap?: boolean;
-    lockAnchor?: boolean;
-    behindDocument?: boolean;
-    layoutInCell?: boolean;
+    readonly horizontalPosition: IHorizontalPositionOptions;
+    readonly verticalPosition: IVerticalPositionOptions;
+    readonly allowOverlap?: boolean;
+    readonly lockAnchor?: boolean;
+    readonly behindDocument?: boolean;
+    readonly layoutInCell?: boolean;
 }

src/file/drawing/floating/horizontal-position.ts

@@ -5,11 +5,11 @@ import { HorizontalPositionRelativeFrom, IHorizontalPositionOptions } from "./fl
 import { PositionOffset } from "./position-offset";
 
 interface IHorizontalPositionAttributes {
-    relativeFrom: HorizontalPositionRelativeFrom;
+    readonly relativeFrom: HorizontalPositionRelativeFrom;
 }
 
 class HorizontalPositionAttributes extends XmlAttributeComponent<IHorizontalPositionAttributes> {
-    protected xmlKeys = {
+    protected readonly xmlKeys = {
         relativeFrom: "relativeFrom",
     };
 }

src/file/drawing/floating/simple-pos.ts

@@ -2,12 +2,12 @@
 import { XmlAttributeComponent, XmlComponent } from "file/xml-components";
 
 interface ISimplePosAttributes {
-    x: number;
-    y: number;
+    readonly x: number;
+    readonly y: number;
 }
 
 class SimplePosAttributes extends XmlAttributeComponent<ISimplePosAttributes> {
-    protected xmlKeys = {
+    protected readonly xmlKeys = {
         x: "x",
         y: "y",
     };

src/file/drawing/floating/vertical-position.ts

@@ -5,11 +5,11 @@ import { IVerticalPositionOptions, VerticalPositionRelativeFrom } from "./floati
 import { PositionOffset } from "./position-offset";
 
 interface IVerticalPositionAttributes {
-    relativeFrom: VerticalPositionRelativeFrom;
+    readonly relativeFrom: VerticalPositionRelativeFrom;
 }
 
 class VerticalPositionAttributes extends XmlAttributeComponent<IVerticalPositionAttributes> {
-    protected xmlKeys = {
+    protected readonly xmlKeys = {
         relativeFrom: "relativeFrom",
     };
 }