add two pages view

src/components/BookComponent.tsx

@@ -1,5 +1,6 @@
 import React, {createContext} from 'react'
 import OnePageView from './OnePageView'
+import TwoPagesView from './TwoPagesView'
 
 export const BookContext = createContext({})
 
@@ -36,7 +37,7 @@ export interface IBookContext {
 }
 
 
-class BookComponent extends React.Component<any>{
+class BookComponent extends React.Component<any, any>{
     constructor(props: any){
         super(props)
         this.state = {
@@ -45,10 +46,18 @@ class BookComponent extends React.Component<any>{
             flagToReverse: false,
             mode: "one page",
             setBookContextState: (newState: IBookContext)=>{
-                this.setState(oldState=> ({
+                this.setState((oldState: any)=> ({
                     ...oldState,
                     ...newState
                 }))
+            },
+            changePage: (indexToGo: number, goToPrevious: boolean)=>{
+                const newCurrIndex = this.state.currIndex + indexToGo
+                
+                this.setState({
+                    currIndex: newCurrIndex,
+                    flagToReverse: goToPrevious
+                })
             }
         } 
     }
@@ -72,11 +81,14 @@ class BookComponent extends React.Component<any>{
     }
     
     render(){
+        const {mode} = this.state
+
         return <BookContext.Provider value={{...this.state}}>
             <BookContext.Consumer>
                 {state=>(
                     <>
-                        <OnePageView {...state}/>
+                        {mode === "one page" && <OnePageView {...state}/>}
+                        {mode === "two pages" && <TwoPagesView {...state}/>}
                     </>
                 )}
             </BookContext.Consumer>

src/components/JumpControls.tsx

@@ -17,7 +17,7 @@ const JumpControls = (props: any)=>{
                 }                
             }  
         },
-        [inputValue])
+        [inputValue, src.length, setBookContextState])
 
     useEffect(()=>{
         setInputValue(currIndex + 1)

src/components/OnePageView.tsx

@@ -1,4 +1,4 @@
-import React, {useState, useCallback, useEffect} from 'react'
+import React, {useState, useEffect} from 'react'
 import {Transition, animated} from 'react-spring/renderprops'
 import styled, { } from 'styled-components'
 import BookComponentsController from './BookComponentsController'
@@ -24,10 +24,9 @@ const PageContainer = styled.div`
         height: 100%;
     }
 `
-
+const StyledImage = styled(animated.div)<{src:string, width:number | string, height: number| string}>`
-const StyledImage = styled(animated.div)<{src:string}>`
+    width: ${props=> props.width? props.width: '100%'};
-    width: 100%;
+    height: ${props=> props.height? props.height: '100%'};
-    height: 100%;
     display: flex;
     justify-content: center;
     align-items: center;
@@ -36,24 +35,16 @@ const StyledImage = styled(animated.div)<{src:string}>`
 `
 
 const PageComponent = (props: any)=>{
-    const {src} = props
+    const {src, width, height} = props
-    return <StyledImage src={src}/>
+    return <StyledImage src={src} width={width} height={height}/>
 }
 
 
 function BookComponent(props: any) {
-    const {src, currIndex, setBookContextState, flagToReverse} = props
+    const {src, currIndex, flagToReverse, changePage} = props
     const [prevDisable, setPrevDisable] = useState(true)
     const [nextDisable, setNextDisable] = useState(false)
     
-    const changePage = useCallback((indexToGo, goToPrevious)=>{
-        const newCurrIndex = currIndex + indexToGo
-        setBookContextState({
-            currIndex: newCurrIndex,
-            flagToReverse: goToPrevious
-        })
-    
-    }, [currIndex])
 
     useEffect(() => {
         setNextDisable(currIndex >= src.length - 1)
@@ -77,8 +68,6 @@ function BookComponent(props: any) {
                             return(
                                 <animated.div style={{
                                     ...style,
-                                    overflowX: 'hidden'
-                                    
                                     }}>
                                     {React.createElement(()=><PageComponent src={src[currIndex]? src[currIndex].src: null}/>)}
                                 </animated.div>
@@ -100,4 +89,4 @@ function BookComponent(props: any) {
     )
 }
 
-export default BookComponent
+export {ComponentContainer, PageContainer, PageComponent, BookComponent as default }  

src/components/TwoPagesView.tsx

@@ -0,0 +1,118 @@
+import React, {useState, useEffect, useCallback} from 'react'
+import {Transition, animated} from 'react-spring/renderprops'
+import BookComponentsController from './BookComponentsController'
+import {ComponentContainer, PageComponent, PageContainer} from './OnePageView'
+import { IBookContext } from './BookComponent'
+
+export default function TwoPagesView(props: any) {
+    let {src, currIndex, changePage, flagToReverse} = props
+    const [pagesToshow, setPagesToShow] = useState<IBookContext[]>([])
+    const [prevDisable, setPrevDisable] = useState(true)
+    const [nextDisable, setNextDisable] = useState(false)
+
+    
+    useEffect(()=>{
+        const shouldShowPage = (pageIndex: number)=>{
+            return src.length > 0 && pageIndex <= src.length - 1
+        }
+
+        const newCurrIndex = currIndex % 2 === 0 ? currIndex: currIndex - 1
+
+        const shouldShowFirstPage = shouldShowPage(newCurrIndex)
+        if(shouldShowFirstPage){
+            const shouldShowSecondPage = shouldShowPage(newCurrIndex + 1)
+            setPagesToShow([
+                src[newCurrIndex], 
+                shouldShowSecondPage? src[newCurrIndex + 1]: {
+                        src: '',
+                        alt: '',
+                        thumbnail: '',
+                    }
+            ])
+        }
+
+        setPrevDisable(newCurrIndex <= 1)
+        setNextDisable(newCurrIndex >= src.length - 2)
+    }, [currIndex, src])
+
+    const pageChangeClick = useCallback((indexToGo, flagToReverse)=>{
+        const newIndex = currIndex + indexToGo
+        const shouldChangePage = newIndex >= 0 && newIndex < src.length
+        if(shouldChangePage){
+            changePage(indexToGo, flagToReverse)
+        }
+    }, [src.length, currIndex, changePage])
+
+    return (
+        <ComponentContainer>
+            <PageContainer>
+                <Transition
+                    reset
+                    unique
+                    items={pagesToshow}
+                    keys={(item: any)=> item.src}
+                    initial={{}}
+                    from={{opacity: 1, transform: flagToReverse? "translate3d(-50%, 0, 0)": "translate3d(100%, 0, 0)"}}
+                    enter={{ opacity: 1, transform: "translate3d(0%, 0, 0)" }}
+                    leave={{ opacity: 0, transform: flagToReverse? "translate3d(100%, 0, 0)": "translate3d(-50%, 0, 0)"}}
+                >
+                    {
+                        currIndex=> style=>{
+                            return(
+                                <animated.div style={{
+                                    ...style,
+                                    }}>
+                                    {React.createElement(()=>{
+                                        return <PageComponent width={"50%"} src={pagesToshow[0]? pagesToshow[0].src: null}/>
+                                    })}
+                                </animated.div>
+                            )
+                        }
+                    }
+                </Transition>
+
+                <Transition
+                    reset
+                    unique
+                    items={pagesToshow}
+                    keys={(item: any)=> item.src}
+                    from={{opacity: 1, transform: flagToReverse? "translate3d(0%, 0, 0)": "translate3d(150%, 0, 0)"}}
+                    enter={{ opacity: 1, transform: "translate3d(50%, 0, 0)" }}
+                    leave={{ opacity: 0, transform: flagToReverse? "translate3d(150%, 0, 0)": "translate3d(0%, 0, 0)"}}
+                    initial={{}}
+                >
+                    {
+                        currIndex=> style=>{
+                            return(
+                                <animated.div style={{
+                                    ...style,
+                                    }}>
+                                    {React.createElement(()=>{
+                                        return <PageComponent width={"50%"} src={pagesToshow[1]? pagesToshow[1].src: null}/>
+                                    })}
+                                </animated.div>
+                            )
+                        }
+                    }
+                </Transition>
+            </PageContainer>
+            <BookComponentsController 
+                prevDisable={prevDisable} 
+                onPrevClick={()=> {
+                    pageChangeClick(-2, true)
+                    
+                }}
+                nextDisable={nextDisable}
+                onNextClick={()=>{
+                    pageChangeClick(2, false)
+                }}
+                {...props}
+            />
+        </ComponentContainer>
+    )
+}
+
+interface Book {
+    name: string
+}
+

src/components/ViewSwitcher.tsx

@@ -12,13 +12,13 @@ export default function ViewSwitcher(props: IBookContext) {
         setBookContextState({
             mode
         })
-    },[])
+    },[setBookContextState])
 
     return (
         <Select value={mode} onSelect={viewModeChange}>
             {
                 bookViewModes.map((item: any)=>{
-                    return <Option value={item.value}>{item.text}</Option>
+                    return <Option value={item.value} key={item.value}>{item.text}</Option>
                 })
             }
         </Select>