593 lines
26 KiB
TypeScript
593 lines
26 KiB
TypeScript
// Learn TypeScript:
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// - https://docs.cocos.com/creator/manual/en/scripting/typescript.html
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// Learn Attribute:
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// - https://docs.cocos.com/creator/manual/en/scripting/reference/attributes.html
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// Learn life-cycle callbacks:
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// - https://docs.cocos.com/creator/manual/en/scripting/life-cycle-callbacks.html
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import ItemRender from "./ItemRender"
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const { ccclass, property } = cc._decorator;
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/**列表排列方式 */
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export enum ListType {
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/**水平排列 */
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Horizontal = 1,
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/**垂直排列 */
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Vertical = 2,
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/**网格排列 */
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Grid = 3
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}
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/**网格布局中的方向 */
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export enum StartAxisType {
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/**水平排列 */
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Horizontal = 1,
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/**垂直排列 */
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Vertical = 2,
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}
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/**
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* 列表
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* 根据cocos_example的listView改动而来
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* @author chenkai 2020.7.8
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* @example
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* 1.创建cocos的ScrollView组件，添加List，设置List属性即可
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*
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*/
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@ccclass
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export default class List extends cc.Component {
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//==================== 属性面板 =========================
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/**列表选项 */
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@property({ type: cc.Node, tooltip: "列表项" })
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public itemRender: cc.Node = null;
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/**排列方式 */
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@property({ type: cc.Enum(ListType), tooltip: "排列方式" })
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public type: ListType = ListType.Vertical;
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/**网格布局中的方向 */
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@property({ type: cc.Enum(StartAxisType), tooltip: "网格布局中的方向", visible() { return this.type == ListType.Grid } })
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public startAxis: StartAxisType = StartAxisType.Horizontal;
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/**列表项之间X间隔 */
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@property({ type: cc.Integer, tooltip: "列表项X间隔", visible() { return (this.type == ListType.Horizontal || this.type == ListType.Grid) } })
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public spaceX: number = 0;
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/**列表项之间Y间隔 */
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@property({ type: cc.Integer, tooltip: "列表项Y间隔", visible() { return this.type == ListType.Vertical || this.type == ListType.Grid } })
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public spaceY: number = 0;
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/**上间距 */
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@property({ type: cc.Integer, tooltip: "上间距", visible() { return (this.type == ListType.Vertical || this.type == ListType.Grid) } })
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public padding_top: number = 0;
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/**下间距 */
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@property({ type: cc.Integer, tooltip: "下间距", visible() { return (this.type == ListType.Vertical || this.type == ListType.Grid) } })
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public padding_buttom: number = 0;
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/**左间距 */
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@property({ type: cc.Integer, tooltip: "左间距", visible() { return (this.type == ListType.Horizontal || this.type == ListType.Grid) } })
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public padding_left: number = 0;
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@property(cc.Integer)
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public _padding: number = 0;
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/**右间距 */
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@property({ type: cc.Integer, tooltip: "右间距", visible() { return (this.type == ListType.Horizontal || this.type == ListType.Grid) } })
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public padding_right: number = 0;
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//====================== 滚动容器 ===============================
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/**列表滚动容器 */
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public scrollView: cc.ScrollView = null;
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/**scrollView的内容容器 */
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private content: cc.Node = null;
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//======================== 列表项 ===========================
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/**列表项数据 */
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private itemDataList: Array<any> = [];
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/**应创建的实例数量 */
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private spawnCount: number = 0;
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/**存放列表项实例的数组 */
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private itemList: Array<cc.Node> = [];
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/**item的高度 */
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private itemHeight: number = 0;
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/**item的宽度 */
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private itemWidth: number = 0;
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/**存放不再使用中的列表项 */
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private itemPool: Array<cc.Node> = [];
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//======================= 计算参数 ==========================
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/**距离scrollView中心点的距离，超过这个距离的item会被重置，一般设置为 scrollVIew.height/2 + item.heigt/2 + space，因为这个距离item正好超出scrollView显示范围 */
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private halfScrollView: number = 0;
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/**上一次content的X值，用于和现在content的X值比较，得出是向左还是向右滚动 */
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private lastContentPosX: number = 0;
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/**上一次content的Y值，用于和现在content的Y值比较，得出是向上还是向下滚动 */
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private lastContentPosY: number = 0;
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/**网格行数 */
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private gridRow: number = 0;
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/**网格列数 */
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private gridCol: number = 0;
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/**刷新时间，单位s */
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private updateTimer: number = 0;
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/**刷新间隔，单位s */
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private updateInterval: number = 0.1;
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/**是否滚动容器 */
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private bScrolling: boolean = false;
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/**刷新的函数 */
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private updateFun: Function = function () { };
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onLoad() {
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this.itemHeight = this.itemRender.height;
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this.itemWidth = this.itemRender.width;
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this.scrollView = this.node.getComponent(cc.ScrollView);
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this.content = this.scrollView.content;
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this.content.anchorX = 0;
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this.content.anchorY = 1;
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this.content.removeAllChildren();
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this.scrollView.node.on("scrolling", this.onScrolling, this);
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}
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/**
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* 列表数据 (列表数据复制使用，如果列表数据改变，则需要重新设置一遍数据)
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* @param itemDataList item数据列表
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*/
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public setData(itemDataList: Array<any>) {
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this.itemDataList = itemDataList.slice();
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this.updateContent();
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}
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/**计算列表的各项参数 */
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private countListParam() {
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let dataLen = this.itemDataList.length;
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if (this.type == ListType.Vertical) {
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this.scrollView.horizontal = false;
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this.scrollView.vertical = true;
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this.content.width = this.content.parent.width;
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this.content.height = dataLen * this.itemHeight + (dataLen - 1) * this.spaceY + this.padding_top + this.padding_buttom;
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this.spawnCount = Math.round(this.scrollView.node.height / (this.itemHeight + this.spaceY)) + 2; //计算创建的item实例数量，比当前scrollView容器能放下的item数量再加上2个
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this.halfScrollView = this.scrollView.node.height / 2 + this.itemHeight / 2 + this.spaceY; //计算bufferZone，item的显示范围
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this.updateFun = this.updateV;
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} else if (this.type == ListType.Horizontal) {
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this.scrollView.horizontal = true;
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this.scrollView.vertical = false;
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this.content.width = dataLen * this.itemWidth + (dataLen - 1) * this.spaceX + this.padding_left + this.padding_right;
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this.content.height = this.content.parent.height;
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this.spawnCount = Math.round(this.scrollView.node.width / (this.itemWidth + this.spaceX)) + 2;
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this.halfScrollView = this.scrollView.node.width / 2 + this.itemWidth / 2 + this.spaceX;
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this.updateFun = this.udpateH;
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} else if (this.type == ListType.Grid) {
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if (this.startAxis == StartAxisType.Vertical) {
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this.scrollView.horizontal = false;
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this.scrollView.vertical = true;
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this.content.width = this.content.parent.width;
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//如果left和right间隔过大，导致放不下一个item，则left和right都设置为0，相当于不生效
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if (this.padding_left + this.padding_right + this.itemWidth + this.spaceX > this.content.width) {
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this.padding_left = 0;
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this.padding_right = 0;
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console.error("padding_left或padding_right过大");
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}
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this.gridCol = Math.floor((this.content.width - this.padding_left - this.padding_right) / (this.itemWidth + this.spaceX));
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this.gridRow = Math.ceil(dataLen / this.gridCol);
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this.content.height = this.gridRow * this.itemHeight + (this.gridRow - 1) * this.spaceY + this.padding_top + this.padding_buttom;
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this.spawnCount = Math.round(this.scrollView.node.height / (this.itemHeight + this.spaceY)) * this.gridCol + this.gridCol * 2;
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this.halfScrollView = this.scrollView.node.height / 2 + this.itemHeight / 2 + this.spaceY;
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this.updateFun = this.updateGrid_V;
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} else if (this.startAxis == StartAxisType.Horizontal) {
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this.scrollView.horizontal = true;
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this.scrollView.vertical = false;
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//计算高间隔
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this.content.height = this.content.parent.height;
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//如果left和right间隔过大，导致放不下一个item，则left和right都设置为0，相当于不生效
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if (this.padding_top + this.padding_buttom + this.itemHeight + this.spaceY > this.content.height) {
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this.padding_top = 0;
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this.padding_buttom = 0;
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console.error("padding_top或padding_buttom过大");
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}
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this.gridRow = Math.floor((this.content.height - this.padding_top - this.padding_buttom) / (this.itemHeight + this.spaceY));
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this.gridCol = Math.ceil(dataLen / this.gridRow);
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this.content.width = this.gridCol * this.itemWidth + (this.gridCol - 1) * this.spaceX + this.padding_left + this.padding_right;
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this.spawnCount = Math.round(this.scrollView.node.width / (this.itemWidth + this.spaceX)) * this.gridRow + this.gridRow * 2;
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this.halfScrollView = this.scrollView.node.width / 2 + this.itemWidth / 2 + this.spaceX;
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this.updateFun = this.updateGrid_H;
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}
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}
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}
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/**
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* 创建列表
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* @param startIndex 起始显示的数据索引 0表示第一项
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* @param offset scrollView偏移量
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*/
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private createList(startIndex: number, offset: cc.Vec2) {
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//当需要显示的数据长度 > 虚拟列表长度， 删除最末尾几个数据时，列表需要重置位置到scrollView最底端
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if (this.itemDataList.length > this.spawnCount && (startIndex + this.spawnCount - 1) >= this.itemDataList.length) {
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startIndex = this.itemDataList.length - this.spawnCount;
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offset = this.scrollView.getMaxScrollOffset();
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//当需要显示的数据长度 <= 虚拟列表长度， 隐藏多余的虚拟列表项
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} else if (this.itemDataList.length <= this.spawnCount) {
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startIndex = 0;
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}
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for (let i = 0; i < this.spawnCount; i++) {
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let item: cc.Node;
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//需要显示的数据索引在数据范围内，则item实例显示出来
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if (i + startIndex < this.itemDataList.length) {
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if (this.itemList[i] == null) {
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item = this.getItem();
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this.itemList.push(item);
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item.parent = this.content;
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} else {
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item = this.itemList[i];
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}
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//需要显示的数据索引超过了数据范围，则item实例隐藏起来
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} else {
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//item实例数量 > 需要显示的数据量
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if (this.itemList.length > (this.itemDataList.length - startIndex)) {
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item = this.itemList.pop();
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item.removeFromParent();
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this.itemPool.push(item);
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}
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continue;
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}
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let itemRender: ItemRender = item.getComponent(ItemRender);
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itemRender.itemIndex = i + startIndex;
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itemRender.data = this.itemDataList[i + startIndex];
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itemRender.dataChanged();
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if (this.type == ListType.Vertical) {
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//因为content的锚点X是0，所以item的x值是content.with/2表示居中，锚点Y是1，所以item的y值从content顶部向下是0到负无穷。所以item.y= -item.height/2时，是在content的顶部。
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item.setPosition(this.content.width / 2, -item.height * (0.5 + i + startIndex) - this.spaceY * (i + startIndex) - this.padding_top);
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} else if (this.type == ListType.Horizontal) {
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item.setPosition(item.width * (0.5 + i + startIndex) + this.spaceX * (i + startIndex) + this.padding_left, -this.content.height / 2);
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} else if (this.type == ListType.Grid) {
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if (this.startAxis == StartAxisType.Vertical) {
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var row = Math.floor((i + startIndex) / this.gridCol);
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var col = (i + startIndex) % this.gridCol;
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item.setPosition(item.width * (0.5 + col) + this.spaceX * col + this.padding_left, -item.height * (0.5 + row) - this.spaceY * row - this.padding_top);
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item.opacity = 255;
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} else if (this.startAxis == StartAxisType.Horizontal) {
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var row = (i + startIndex) % this.gridRow;
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var col = Math.floor((i + startIndex) / this.gridRow);
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item.setPosition(item.width * (0.5 + col) + this.spaceX * col + this.padding_left, -item.height * (0.5 + row) - this.spaceY * row - this.padding_top);
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item.opacity = 255;
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}
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}
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}
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this.scrollView.scrollToOffset(offset);
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}
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/**获取一个列表项 */
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private getItem() {
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if (this.itemPool.length == 0) {
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return cc.instantiate(this.itemRender);
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} else {
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return this.itemPool.pop();
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}
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}
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update(dt) {
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if (this.bScrolling == false) {
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return;
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}
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this.updateTimer += dt;
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if (this.updateTimer < this.updateInterval) {
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return;
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}
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this.updateTimer = 0;
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this.bScrolling = false;
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this.updateFun();
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}
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onScrolling() {
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this.bScrolling = true;
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}
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/**垂直排列 */
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private updateV() {
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let items = this.itemList;
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let item;
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let bufferZone = this.halfScrollView;
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let isUp = this.scrollView.content.y > this.lastContentPosY;
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let offset = (this.itemHeight + this.spaceY) * items.length;
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for (let i = 0; i < items.length; i++) {
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item = items[i];
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let viewPos = this.getPositionInView(item);
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if (isUp) {
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//item上滑时，超出了scrollView上边界，将item移动到下方复用，item移动到下方的位置必须不超过content的下边界
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if (viewPos.y > bufferZone && item.y - offset - this.padding_buttom > -this.content.height) {
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let itemRender: ItemRender = item.getComponent(ItemRender);
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let itemIndex = itemRender.itemIndex + items.length;
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itemRender.itemIndex = itemIndex;
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itemRender.data = this.itemDataList[itemIndex];
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itemRender.dataChanged();
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item.y = item.y - offset;
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}
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} else {
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//item下滑时，超出了scrollView下边界，将item移动到上方复用，item移动到上方的位置必须不超过content的上边界
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if (viewPos.y < -bufferZone && item.y + offset + this.padding_top < 0) {
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let itemRender: ItemRender = item.getComponent(ItemRender);
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let itemIndex = itemRender.itemIndex - items.length;
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itemRender.itemIndex = itemIndex;
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itemRender.data = this.itemDataList[itemIndex];
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itemRender.dataChanged();
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item.y = item.y + offset;
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}
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}
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}
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this.lastContentPosY = this.scrollView.content.y;
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}
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/**水平排列 */
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private udpateH() {
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let items = this.itemList;
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let item;
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let bufferZone = this.halfScrollView;
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let isRight = this.scrollView.content.x > this.lastContentPosX;
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let offset = (this.itemWidth + this.spaceX) * items.length;
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for (let i = 0; i < items.length; i++) {
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item = items[i];
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let viewPos = this.getPositionInView(item);
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if (isRight) {
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//item右滑时，超出了scrollView右边界，将item移动到左方复用，item移动到左方的位置必须不超过content的左边界
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if (viewPos.x > bufferZone && item.x - offset - this.padding_left > 0) {
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let itemRender: ItemRender = item.getComponent(ItemRender);
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let itemIndex = itemRender.itemIndex - items.length;
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itemRender.itemIndex = itemIndex;
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itemRender.data = this.itemDataList[itemIndex];
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itemRender.dataChanged();
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item.x = item.x - offset;
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}
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} else {
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//item左滑时，超出了scrollView左边界，将item移动到右方复用，item移动到右方的位置必须不超过content的右边界
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if (viewPos.x < -bufferZone && item.x + offset + this.padding_right < this.content.width) {
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let itemRender: ItemRender = item.getComponent(ItemRender);
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let itemIndex = itemRender.itemIndex + items.length;
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itemRender.itemIndex = itemIndex;
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itemRender.data = this.itemDataList[itemIndex];
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itemRender.dataChanged();
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item.x = item.x + offset;
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}
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}
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}
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this.lastContentPosX = this.scrollView.content.x;
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}
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/**网格垂直排列 */
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private updateGrid_V() {
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let items = this.itemList;
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let item: cc.Node;
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let bufferZone = this.halfScrollView;
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let isUp = this.scrollView.content.y > this.lastContentPosY;
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let offset = (this.itemHeight + this.spaceY) * (this.spawnCount / this.gridCol);
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for (let i = 0; i < items.length; i++) {
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item = items[i];
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let viewPos = this.getPositionInView(item);
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if (isUp) {
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//item上滑时，超出了scrollView上边界，将item移动到下方复用，item移动到下方的位置必须不超过content的下边界
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if (viewPos.y > bufferZone && item.y - offset - this.padding_buttom > -this.content.height) {
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let itemRender: ItemRender = item.getComponent(ItemRender);
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let itemIndex = itemRender.itemIndex + (this.spawnCount / this.gridCol) * this.gridCol;
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if (this.itemDataList[itemIndex] != null) {
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item.y = item.y - offset;
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itemRender.itemIndex = itemIndex;
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itemRender.data = this.itemDataList[itemIndex];
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itemRender.dataChanged();
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item.opacity = 255;
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} else {
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item.y = item.y - offset;
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itemRender.itemIndex = itemIndex;
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item.opacity = 0;
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}
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}
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} else {//item下滑时，超出了scrollView下边界，将item移动到上方复用，item移动到上方的位置必须不超过content的上边界
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if (viewPos.y < -bufferZone && item.y + offset + this.padding_top < 0) {
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let itemRender: ItemRender = item.getComponent(ItemRender);
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let itemIndex = itemRender.itemIndex - (this.spawnCount / this.gridCol) * this.gridCol;
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if (this.itemDataList[itemIndex] != null) {
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item.y = item.y + offset;
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itemRender.itemIndex = itemIndex;
|
||
itemRender.data = this.itemDataList[itemIndex];
|
||
itemRender.dataChanged();
|
||
item.opacity = 255;
|
||
} else {
|
||
item.y = item.y + offset;
|
||
itemRender.itemIndex = itemIndex;
|
||
item.opacity = 0;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
this.lastContentPosY = this.scrollView.content.y;
|
||
}
|
||
|
||
/**网格水平排列 */
|
||
private updateGrid_H() {
|
||
let items = this.itemList;
|
||
let item;
|
||
let bufferZone = this.halfScrollView;
|
||
let isRight = this.scrollView.content.x > this.lastContentPosX;
|
||
let offset = (this.itemWidth + this.spaceX) * (this.spawnCount / this.gridRow);
|
||
for (let i = 0; i < items.length; i++) {
|
||
item = items[i];
|
||
let viewPos = this.getPositionInView(item);
|
||
if (isRight) {
|
||
//item右滑时，超出了scrollView右边界，将item移动到左方复用，item移动到左方的位置必须不超过content的左边界
|
||
if (viewPos.x > bufferZone && item.x - offset - this.padding_left > 0) {
|
||
let itemRender: ItemRender = item.getComponent(ItemRender);
|
||
let itemIndex = itemRender.itemIndex - (this.spawnCount / this.gridRow) * this.gridRow;
|
||
if (this.itemDataList[itemIndex] != null) {
|
||
item.x = item.x - offset;
|
||
itemRender.itemIndex = itemIndex;
|
||
itemRender.data = this.itemDataList[itemIndex];
|
||
itemRender.dataChanged();
|
||
item.opacity = 255;
|
||
} else {
|
||
item.x = item.x - offset;
|
||
itemRender.itemIndex = itemIndex;
|
||
item.opacity = 0;
|
||
}
|
||
}
|
||
} else {
|
||
//item左滑时，超出了scrollView左边界，将item移动到右方复用，item移动到右方的位置必须不超过content的右边界
|
||
if (viewPos.x < -bufferZone && item.x + offset + this.padding_right < this.content.width) {
|
||
let itemRender: ItemRender = item.getComponent(ItemRender);
|
||
let itemIndex = itemRender.itemIndex + (this.spawnCount / this.gridRow) * this.gridRow;
|
||
if (this.itemDataList[itemIndex] != null) {
|
||
item.x = item.x + offset;
|
||
itemRender.itemIndex = itemIndex;
|
||
itemRender.data = this.itemDataList[itemIndex];
|
||
itemRender.dataChanged();
|
||
item.opacity = 255;
|
||
} else {
|
||
item.x = item.x + offset;
|
||
itemRender.itemIndex = itemIndex;
|
||
item.opacity = 0;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
this.lastContentPosX = this.scrollView.content.x;
|
||
}
|
||
|
||
/**获取item在scrollView的局部坐标 */
|
||
private getPositionInView(item) {
|
||
let worldPos = item.parent.convertToWorldSpaceAR(item.position);
|
||
let viewPos = this.scrollView.node.convertToNodeSpaceAR(worldPos);
|
||
return viewPos;
|
||
}
|
||
|
||
/**获取列表数据 */
|
||
public getListData() {
|
||
return this.itemDataList;
|
||
}
|
||
|
||
/**
|
||
* 增加一项数据到列表的末尾
|
||
* @param data 数据
|
||
*/
|
||
public addItem(data: any) {
|
||
this.itemDataList.push(data);
|
||
this.updateContent();
|
||
}
|
||
|
||
/**
|
||
* 增加一项数据到列表指定位置
|
||
* @param index 位置，0表示第1项
|
||
* @param data 数据
|
||
*/
|
||
public addItemAt(index: number, data: any) {
|
||
if (this.itemDataList[index] != null || this.itemDataList.length == index) {
|
||
this.itemDataList.splice(index, 1, data);
|
||
this.updateContent();
|
||
}
|
||
}
|
||
|
||
/**
|
||
* 删除一项数据
|
||
* @param index 删除项的位置 ,0表示第1项
|
||
*/
|
||
public deleteItem(index: number) {
|
||
if (this.itemDataList[index] != null) {
|
||
this.itemDataList.splice(index, 1);
|
||
this.updateContent();
|
||
}
|
||
}
|
||
|
||
/**
|
||
* 改变一项数据
|
||
* @param index 位置,0表示第1项
|
||
* @param data 替换的数据
|
||
*/
|
||
public changeItem(index: number, data: any) {
|
||
if (this.itemDataList[index] != null) {
|
||
this.itemDataList[index] = data;
|
||
this.updateContent();
|
||
}
|
||
}
|
||
|
||
/**获取第一个Item的位置 */
|
||
private updateContent() {
|
||
//显示列表实例为0个
|
||
if (this.itemList.length == 0) {
|
||
this.countListParam();
|
||
this.createList(0, new cc.Vec2(0, 0));
|
||
//显示列表的实例不为0个，则需要重新排列item实例数组
|
||
} else {
|
||
if (this.type == ListType.Vertical) {
|
||
this.itemList.sort((a: any, b: any) => {
|
||
return b.y - a.y;
|
||
});
|
||
} else if (this.type == ListType.Horizontal) {
|
||
this.itemList.sort((a: any, b: any) => {
|
||
return a.x - b.x;
|
||
});
|
||
} else if (this.type == ListType.Grid) {
|
||
if (this.startAxis == StartAxisType.Vertical) {
|
||
this.itemList.sort((a: any, b: any) => {
|
||
return a.x - b.x;
|
||
});
|
||
this.itemList.sort((a: any, b: any) => {
|
||
return b.y - a.y;
|
||
});
|
||
} else if (this.startAxis == StartAxisType.Horizontal) {
|
||
this.itemList.sort((a: any, b: any) => {
|
||
return b.y - a.y;
|
||
});
|
||
this.itemList.sort((a: any, b: any) => {
|
||
return a.x - b.x;
|
||
});
|
||
}
|
||
}
|
||
|
||
this.countListParam();
|
||
|
||
//获取第一个item实例需要显示的数据索引
|
||
var startIndex = this.itemList[0].getComponent(ItemRender).itemIndex;
|
||
|
||
if (this.type == ListType.Grid && this.startAxis == StartAxisType.Vertical) {
|
||
startIndex += (startIndex + this.spawnCount) % this.gridCol;
|
||
} else if (this.type == ListType.Grid && this.startAxis == StartAxisType.Horizontal) {
|
||
startIndex += (startIndex + this.spawnCount) % this.gridRow;
|
||
}
|
||
|
||
//getScrollOffset()和scrollToOffset()的x值是相反的
|
||
var offset: cc.Vec2 = this.scrollView.getScrollOffset();
|
||
offset.x = - offset.x;
|
||
|
||
this.createList(startIndex, offset);
|
||
}
|
||
}
|
||
|
||
/**销毁 */
|
||
public onDestroy() {
|
||
//清理列表项
|
||
let len = this.itemList.length;
|
||
for (let i = 0; i < len; i++) {
|
||
if (cc.isValid(this.itemList[i], true)) {
|
||
this.itemList[i].destroy();
|
||
}
|
||
}
|
||
this.itemList.length = 0;
|
||
//清理对象池
|
||
len = this.itemPool.length;
|
||
for (let i = 0; i < len; i++) {
|
||
if (cc.isValid(this.itemPool[i], true)) {
|
||
this.itemPool[i].destroy();
|
||
}
|
||
}
|
||
this.itemPool.length = 0;
|
||
//清理列表数据
|
||
this.itemDataList.length = 0;
|
||
}
|
||
}
|