Asroads'Blog 君子不器
从一个UI左右无限翻页组件说起
发布于: 2021-08-31 更新于: 2021-08-31 分类于: game 阅读次数: 

两年前还在使用Layabox 的时候 就做过一个类似的翻页组件,LayaBox2.0横向滑动特效 做了Cocos 这些日子一直想做个类似的功能,但是一直没有时间,于是无意间在论坛发现了一个,于是开始了这篇文章,作者用的是2.4.x 版本,最初我只是做了Cocos Creator的语法兼容,并未修改功能,后面有网友提出 想要一个不循环的版本,于是做了个加强版本。

首先要感谢原作者,所有逻辑都是建立在原作者的基础上,大家要感谢,首先感谢这位仁兄的无私精神,我只是搬运工,在使用的过程中,二次加工而已。

最终效果:

作者原 2.4.x 版本循环翻页效果

img

原作者 代码下载 ScrollSelect.zip

3.x 语法兼容循环翻页效果:

1001

3.x 语法兼容设置不循环翻页效果:

1002

设置选项

image

最后放上源码

3.x 语法翻译版本

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import {_decorator, Component,Node, CCInteger, EventHandler, EventTouch, UITransform, v2, v3, CCFloat} from 'cc';
const {ccclass, property} = _decorator;
export enum EventType {
SCROLL_START,
SCROLL_ING,
SCROLL_END
}
@ccclass('UIScrollSelect')
export class UIScrollSelect extends Component {
public static EventType = EventType;
@property(Node)
content :Node = null;
@property({
type:CCInteger,
tooltip:'单个控件之间的距离'
})
deltaX : number = 100 //x间隔距离
@property({
type:CCFloat,
tooltip:'中心点的缩放比例'
})
centerScale : number = 1.0
@property({
type:CCFloat,
tooltip:'边缘点的缩放比例'
})
minScale : number = 1.0
@property({
type:CCFloat,
tooltip:'滚动时的速度'
})
scrollSpeed: number = 300;
@property({
type: EventHandler,
tooltip: "选择后的回调"
})
selectEvents:Array<EventHandler> = [];

private childs:Array<Node> = [];
private isTouching : boolean = false;
private hasTouchMove : boolean = false;
private isTestX : boolean = false;
private _touchId: any = null;
private currentIndex:number = 0;
private _toMoveX:number = 1; //移动方向
private dx:number = 0;
private moveAim : number = 0;

onLoad(){
this.childs = [];
for(let i=0; i<this.content.children.length; i++){
this.childs[i] = this.content.children[i];
this.childs[i].position = v3(this.deltaX*(i-1),this.childs[i].position.y,0)
}
this.isTouching = false
this.hasTouchMove = false
this.isTestX = false;
this._touchId = null;
// this.currentIndex = 0;
this.scrollTo(0,false);
}
/** 滚动到指定节点
* @param idx
* @param anim 是否带移动动画
*/
scrollTo(idx:number,anim:boolean=true){
if(idx < 0 && idx >= this.childs.length){
return console.error(this.node.name+'->移动超出边界面')
}
this.currentIndex = idx;
this.moveAim = idx;
if(!anim){
for(let i=0; i<this.childs.length; i++){
this._checkChildX(this.childs[i],(i-idx) *this.deltaX)
}
} else {
this.isTestX = true
EventHandler.emitEvents(this.selectEvents, {target :this,
type :EventType.SCROLL_START,
index : this.currentIndex});
}
}
/** 向左滚一个点 */
scrollToLeft(){
this._toMoveX = 1
this.scrollTo((this.currentIndex-1+this.childs.length)%this.childs.length)
}

/** 向左滚一个点 */
scrollToRight(){
this._toMoveX = -1
this.scrollTo((this.currentIndex+1+this.childs.length)%this.childs.length)
}

_checkChildX(child:Node,x:number){
if(x > this.childs.length/2 * this.deltaX){
x-=this.childs.length * this.deltaX
} else if(x < -this.childs.length/2 * this.deltaX){
x+=this.childs.length * this.deltaX
}
child.position = v3(x,child.position.y,child.position.z)
let dx = Math.min(Math.abs(x),this.deltaX)
let scale:number = (1-dx/this.deltaX)*(this.centerScale-this.minScale) + this.minScale
child.scale = v3(scale,scale,1)
}

start(){
this.content.on(Node.EventType.TOUCH_START,this._onTouch,this);
this.content.on(Node.EventType.TOUCH_MOVE,this._onTouch,this);
this.content.on(Node.EventType.TOUCH_END,this._onTouchEnd,this);
this.content.on(Node.EventType.TOUCH_CANCEL,this._onTouchEnd,this);
}
_onTouch(event:EventTouch ){
if(this._touchId != null && event.touch != this._touchId){
return;
}
if(event.type == Node.EventType.TOUCH_START){
this.isTouching = true;
this.hasTouchMove = false
this.isTestX = false;
this._touchId = event.touch;
this.dx = event.getUIStartLocation().x
let evt = {
target :this,
type :EventType.SCROLL_START,
index : this.currentIndex
}
EventHandler.emitEvents(this.selectEvents, evt);
return;
}
this.hasTouchMove = true;
let dx = event.getUILocation().x - this.dx
this._move(dx);
this.dx = event.getUILocation().x
let evt = {
target :this,
type :EventType.SCROLL_ING,
dx:this.dx
}
EventHandler.emitEvents(this.selectEvents, evt);
}
_onTouchEnd(event){
if(this._touchId != null && event.touch != this._touchId){
return;
}
this.isTouching = false;
if(event.type == Node.EventType.TOUCH_END || event.type == Node.EventType.TOUCH_CANCEL){
this._touchId = null;
}
let tf = this.node.getComponent(UITransform)
let lo = tf.convertToNodeSpaceAR(event.getUILocation())
if(!this.hasTouchMove){

let mx = Math.ceil((lo.x - this.deltaX / 2) / this.deltaX)
if(mx === 0){
let event1 = {
target :this,
type :EventType.SCROLL_END,
index : this.currentIndex
}
EventHandler.emitEvents(this.selectEvents, event1);
} else {
this.moveAim = (this.currentIndex+mx+this.childs.length)%this.childs.length
this._toMoveX = mx > 0 ? -1 : 1
this.isTestX = true;
}
return;
}
let max = this.deltaX;
let minidx = 0
for(let i=0; i<this.childs.length; i++){
if(Math.abs(this.childs[i].position.x)<=max){
max = Math.abs(this.childs[i].position.x)
minidx = i;
}
}
this.moveAim = minidx
this._toMoveX = this.childs[minidx].position.x >= 0 ? -1 : 1
this.isTestX = true;
}
_move(dt){
for(let i=0; i<this.childs.length; i++){
this._checkChildX(this.childs[i],this.childs[i].position.x+dt)
}
}


update(dt){
if(this.isTouching || !this.isTestX){
return;
}
let stepx = this._toMoveX * dt * this.scrollSpeed
let lx = this.childs[this.moveAim].position.x
for(let i=0; i<this.childs.length; i++){
this._checkChildX(this.childs[i],this.childs[i].position.x+stepx)
}

let x = this.childs[0].position.x;
let idx = Math.round(x/this.deltaX);
let tox = this.deltaX * idx;
let cx = this.childs[this.moveAim].position.x
if(lx * cx < 0 && Math.abs(cx) < this.deltaX){
this.isTestX = false;
for(let i=0; i<this.childs.length; i++){
if(Math.abs(this.childs[i].position.x)<=Math.abs(stepx)){
this.currentIndex = i;
break;
}
}
for(let i=0; i<this.childs.length; i++){
this._checkChildX(this.childs[i],this.childs[i].position.x+tox-x)
}
let event = {
target :this,
type :EventType.SCROLL_END,
index : this.currentIndex
}
EventHandler.emitEvents(this.selectEvents, event);
}
}
}

可以配置 不循环翻页加强版本:

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import {_decorator, Button, CCFloat, CCInteger, Component, EventHandler, EventTouch, Node, UITransform, v3} from 'cc';

const {ccclass, property} = _decorator;

export enum EventType {
SCROLL_START,
SCROLL_ING,
SCROLL_END
}

@ccclass('UIScrollSelect')
export class UIScrollSelect extends Component {
public static EventType = EventType;
@property(Node)
content: Node = null;
@property({
tooltip: "是否无限翻页"
})
circlePage: boolean = true;
@property({
type: Button,
tooltip: '左边按钮',
visible(this: UIScrollSelect) {
return !this.circlePage;
}
})
leftBtn: Button = null;
@property({
type: Button,
tooltip: '右边按钮',
visible(this: UIScrollSelect) {
return !this.circlePage;
}
})
rightBtn: Button = null;

@property({
type: CCInteger,
tooltip: '单个控件之间的距离'
})
deltaX: number = 100; //x间隔距离
@property({
type: CCFloat,
tooltip: '中心点的缩放比例'
})
centerScale: number = 1.0;
@property({
type: CCFloat,
tooltip: '边缘点的缩放比例'
})
minScale: number = 1.0;
@property({
type: CCFloat,
tooltip: '滚动时的速度'
})
scrollSpeed: number = 300;
@property({
type: EventHandler,
tooltip: "选择后的回调"
})
selectEvents: Array<EventHandler> = [];



private childs: Array<Node> = [];
private isTouching: boolean = false;
private hasTouchMove: boolean = false;
private isTestX: boolean = false;
private _touchId: any = null;
private currentIndex: number = 0;
private _toMoveX: number = 1; //移动方向
private dx: number = 0;
private moveAim: number = 0;

onLoad() {
this.childs = [];
for (let i = 0; i < this.content.children.length; i++) {
this.childs[i] = this.content.children[i];
this.childs[i].position = v3(this.deltaX * (i - 1), this.childs[i].position.y, 0);
}
this.isTouching = false;
this.hasTouchMove = false;
this.isTestX = false;
this._touchId = null;
// this.currentIndex = 0;
this.scrollTo(0, false);
}

/** 滚动到指定节点
* @param idx
* @param anim 是否带移动动画
*/
scrollTo(idx: number, anim: boolean = true) {
if (idx < 0 && idx >= this.childs.length) {
return console.error(this.node.name + '->移动超出边界面');
}
this.currentIndex = idx;
this.moveAim = idx;
if (!anim) {
for (let i = 0; i < this.childs.length; i++) {
this._checkChildX(this.childs[i], (i - idx) * this.deltaX);
}
} else {
this.isTestX = true;
EventHandler.emitEvents(this.selectEvents, {
target: this,
type: EventType.SCROLL_START,
index: this.currentIndex
});
}
}

/** 向左滚一个点 */
scrollToLeft() {
this._toMoveX = 1;
this.scrollTo((this.currentIndex - 1 + this.childs.length) % this.childs.length);
this._setPageBtnsStatus();
}

/** 向左滚一个点 */
scrollToRight() {
this._toMoveX = -1;
this.scrollTo((this.currentIndex + 1 + this.childs.length) % this.childs.length);
this._setPageBtnsStatus();

}

/**
* 更新按钮状态
*/
_setPageBtnsStatus() {
const isRightEdge: boolean = this.currentIndex >= this.childs.length - 1;
if (!this.circlePage && isRightEdge) {
console.log("已经到了最右边", this.currentIndex);
if (this.rightBtn) this.rightBtn.interactable = false;
} else {
if (this.rightBtn) this.rightBtn.interactable = true;
}
const isLeftEdge: boolean = this.currentIndex <= 0;
if (!this.circlePage && isLeftEdge) {
console.log("已经到了最左边", this.currentIndex);
if (this.leftBtn) this.leftBtn.interactable = false;
} else {
if (this.leftBtn) this.leftBtn.interactable = true;
}
}

_checkChildX(child: Node, x: number) {
if (this.circlePage) {
if (x > this.childs.length / 2 * this.deltaX) {
x -= this.childs.length * this.deltaX;
} else if (x < -this.childs.length / 2 * this.deltaX) {
x += this.childs.length * this.deltaX;
}
}
child.position = v3(x, child.position.y, child.position.z);
let dx = Math.min(Math.abs(x), this.deltaX);
let scale: number = (1 - dx / this.deltaX) * (this.centerScale - this.minScale) + this.minScale;
child.scale = v3(scale, scale, 1);
}

start() {
this.content.on(Node.EventType.TOUCH_START, this._onTouch, this);
this.content.on(Node.EventType.TOUCH_MOVE, this._onTouch, this);
this.content.on(Node.EventType.TOUCH_END, this._onTouchEnd, this);
this.content.on(Node.EventType.TOUCH_CANCEL, this._onTouchEnd, this);
}

_onTouch(event: EventTouch) {
if (this._touchId != null && event.touch != this._touchId) {
return;
}
if (event.type == Node.EventType.TOUCH_START) {
this.isTouching = true;
this.hasTouchMove = false;
this.isTestX = false;
this._touchId = event.touch;
this.dx = event.getUIStartLocation().x;
let evt = {
target: this,
type: EventType.SCROLL_START,
index: this.currentIndex
};
EventHandler.emitEvents(this.selectEvents, evt);
return;
}
this.hasTouchMove = true;
let dx = event.getUILocation().x - this.dx;
this._move(dx);
this.dx = event.getUILocation().x;
let evt = {
target: this,
type: EventType.SCROLL_ING,
dx: this.dx
};
EventHandler.emitEvents(this.selectEvents, evt);
}

/**
* 是否到达左右边缘
* @returns {{left: boolean, right: boolean}}
*/
_isMoveEdge() {
const leftEdge = this.childs[0].position.x >= 0;
const rightEdge = this.childs[this.childs.length - 1].position.x <= 0;
return {left: leftEdge, right: rightEdge};
}

_onTouchEnd(event) {
if (this._touchId != null && event.touch != this._touchId) {
return;
}
this.isTouching = false;
if (event.type == Node.EventType.TOUCH_END || event.type == Node.EventType.TOUCH_CANCEL) {
this._touchId = null;
}
if (!this.circlePage) {
let edge = this._isMoveEdge();
if (edge.right) {
console.log("最右边 无法动");
return;
}
if (edge.left) {
console.log("最左边 无法动");
return;
}
}
let tf = this.node.getComponent(UITransform);
let lo = tf.convertToNodeSpaceAR(event.getUILocation());
if (!this.hasTouchMove) {

let mx = Math.ceil((lo.x - this.deltaX / 2) / this.deltaX);
if (mx === 0) {
let event1 = {
target: this,
type: EventType.SCROLL_END,
index: this.currentIndex
};
EventHandler.emitEvents(this.selectEvents, event1);
} else {
this.moveAim = (this.currentIndex + mx + this.childs.length) % this.childs.length;
this._toMoveX = mx > 0 ? -1 : 1;
this.isTestX = true;
}
return;
}
let max = this.deltaX;
let minidx = 0;
for (let i = 0; i < this.childs.length; i++) {
if (Math.abs(this.childs[i].position.x) <= max) {
max = Math.abs(this.childs[i].position.x);
minidx = i;
}
}
this.moveAim = minidx;
this._toMoveX = this.childs[minidx].position.x >= 0 ? -1 : 1;
this.isTestX = true;
}

_move(dt) {
if (dt === 0) return;
if (!this.circlePage) {
let edge = this._isMoveEdge();
if (dt < 0 && edge.right) {
console.log("最右边 无法动");
return;
}
if (dt > 0 && edge.left) {
console.log("最左边 无法动");
return;
}
}
for (let i = 0; i < this.childs.length; i++) {
this._checkChildX(this.childs[i], this.childs[i].position.x + dt);
}
}


update(dt) {
if (this.isTouching || !this.isTestX) {
return;
}
let stepx = this._toMoveX * dt * this.scrollSpeed;
let lx = this.childs[this.moveAim].position.x;
for (let i = 0; i < this.childs.length; i++) {
this._checkChildX(this.childs[i], this.childs[i].position.x + stepx);
}

let x = this.childs[0].position.x;
let idx = Math.round(x / this.deltaX);
let tox = this.deltaX * idx;
let cx = this.childs[this.moveAim].position.x;
if (lx * cx < 0 && Math.abs(cx) < this.deltaX) {
this.isTestX = false;
for (let i = 0; i < this.childs.length; i++) {
if (Math.abs(this.childs[i].position.x) <= Math.abs(stepx)) {
this.currentIndex = i;
break;
}
}
for (let i = 0; i < this.childs.length; i++) {
this._checkChildX(this.childs[i], this.childs[i].position.x + tox - x);
}
let event = {
target: this,
type: EventType.SCROLL_END,
index: this.currentIndex
};
EventHandler.emitEvents(this.selectEvents, event);
}
}
}

参考

--- 本文结束 The End ---