Jon*_*002 13 navigation swipe-gesture angular
我是Angular 2的新手,我正在寻找一种方法,为移动用户实现一个良好的标签触摸滑动导航,并滑动过渡到下一个标签视图.
到目前为止,我已经找到了一个名为angular2-useful-swiper的软件包,虽然我并不热衷于使用它,因为我最终尽早初始化我的组件,即使它们不在视野中.
有谁知道为Angular 2实现基于选项卡滑动的导航的好方法?任何反馈将不胜感激.:)
pik*_*iou 56
对于滑动检测,这里比添加HammerJS更简单:
在app.component.html中:
<div (touchstart)="swipe($event, 'start')" (touchend)="swipe($event, 'end')">
App content here
</div>
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在app.component.ts中:
private swipeCoord?: [number, number];
private swipeTime?: number;
swipe(e: TouchEvent, when: string): void {
const coord: [number, number] = [e.changedTouches[0].clientX, e.changedTouches[0].clientY];
const time = new Date().getTime();
if (when === 'start') {
this.swipeCoord = coord;
this.swipeTime = time;
} else if (when === 'end') {
const direction = [coord[0] - this.swipeCoord[0], coord[1] - this.swipeCoord[1]];
const duration = time - this.swipeTime;
if (duration < 1000 //
&& Math.abs(direction[0]) > 30 // Long enough
&& Math.abs(direction[0]) > Math.abs(direction[1] * 3)) { // Horizontal enough
const swipe = direction[0] < 0 ? 'next' : 'previous';
// Do whatever you want with swipe
}
}
}
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注意:我尝试了HammerJS解决方案,但是将其配置为忽略鼠标手势是不可能的,因为您无法直接访问Hammer对象.所以选择一些文字迫使导航到下一页......
小智 13
我从 @Elvis Metodiev 答案和 @pikiou 创建了一条指令:
swipe.directive.ts
import { Directive, EventEmitter, HostListener, Output } from '@angular/core';
@Directive({ selector: '[swipe]' })
export class SwipeDirective {
@Output() next = new EventEmitter<void>();
@Output() previous = new EventEmitter<void>();
swipeCoord = [0, 0];
swipeTime = new Date().getTime();
constructor() { }
@HostListener('touchstart', ['$event']) onSwipeStart($event) {
this.onSwipe($event, 'start');
}
@HostListener('touchend', ['$event']) onSwipeEnd($event) {
this.onSwipe($event, 'end');
}
onSwipe(e: TouchEvent, when: string) {
this.swipe(e, when);
}
swipe(e: TouchEvent, when: string): void {
const coord: [number, number] = [e.changedTouches[0].clientX, e.changedTouches[0].clientY];
const time = new Date().getTime();
if (when === 'start') {
this.swipeCoord = coord;
this.swipeTime = time;
} else if (when === 'end') {
const direction = [coord[0] - this.swipeCoord[0], coord[1] - this.swipeCoord[1]];
const duration = time - this.swipeTime;
if (duration < 1000 //
&& Math.abs(direction[0]) > 30 // Long enough
&& Math.abs(direction[0]) > Math.abs(direction[1] * 3)) { // Horizontal enough
const swipeDir = direction[0] < 0 ? 'next' : 'previous';
if (swipeDir === 'next') {
this.next.emit();
} else {
this.previous.emit();
}
}
}
}
}
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旅游.组件.组件.ts
<div
...
swipe
(next)="onRotateNext()"
(previous)="onRotatePrevious()"
>
...
</div>
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您可以使用HammerJS实现触摸操作,例如,您可以按照此plunker.
包括hammer.js文件
<script src="https://cdnjs.cloudflare.com/ajax/libs/hammer.js/2.0.8/hammer.js"></script>
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要么
npm install hammerjs --save
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对于使用hammerjs的浏览器触摸支持,包括
<script src="http://cdn.rawgit.com/hammerjs/touchemulator/master/touch-emulator.js"></script>
<script>
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在app.module.ts中导入
import { HammerGestureConfig, HAMMER_GESTURE_CONFIG } from '@angular/platform-browser';
export class MyHammerConfig extends HammerGestureConfig {
overrides = <any>{
'swipe': {velocity: 0.4, threshold: 20} // override default settings
}
}
@NgModule({
imports: [BrowserModule],
declarations: [AppComponent],
bootstrap: [AppComponent],
providers: [{
provide: HAMMER_GESTURE_CONFIG,
useClass: MyHammerConfig
}] // use our custom hammerjs config
})
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要实现标签angular2-material是一个很好的起点,请点击此链接
首先安装Hammerjs和Action触摸动作Polyfill:
$ npm install hammerjs hammer-timejs
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然后将导入添加到“ app.module.ts”中,以便使用/打包它们:
import 'hammerjs';
import 'hammer-timejs';
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现在,您可以处理动作的事件:
旋转
捏
按下
平移
单击
轻扫
例如,您可以说:
$ npm install hammerjs hammer-timejs
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要么:
import 'hammerjs';
import 'hammer-timejs';
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参考:https : //saschwarz.github.io/angular2-gestures-slides/#/
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