在Angular 2中实现滑动导航的最佳方法是什么?

时间:2017-03-04 04:37:58

标签: angular navigation swipe-gesture

我是Angular 2的新用户,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,因为我最终会尽早初始化我的组件,即使它们不在视野中。

有没有人知道为Angular 2实现基于标签滑动的导航的好方法?任何反馈将不胜感激。 :)

5 个答案:

答案 0 :(得分:46)

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>

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].pageX, e.changedTouches[0].pageY];
  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
    }
  }
}

注意:我尝试过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。因此选择一些文本迫使导航到下一页......

答案 1 :(得分:5)

您可以使用HammerJS来实施触摸操作,例如,您可以按照plunker进行操作。

包含hammer.js文件

<script src="https://cdnjs.cloudflare.com/ajax/libs/hammer.js/2.0.8/hammer.js"></script>

npm install hammerjs --save

对于使用hammerjs的浏览器触控支持,请

 <script src="http://cdn.rawgit.com/hammerjs/touchemulator/master/touch-emulator.js"></script>
<script>

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
})

plunker link for example

要实施标签angular2-material是一个很好的起点,请关注this link

答案 2 :(得分:3)

首先安装hammerjs和动作触摸动作polyfill:

$ npm install hammerjs hammer-timejs

然后将导入添加到'app.module.ts',以便它们将被使用/捆绑:

import 'hammerjs';
import 'hammer-timejs';

现在您可以处理动作的事件:
旋转



点击
滑动

例如,您可以说:

<li *ngFor="let employee of employeesList;" (swiperight)="myswiperight(employee)" (swipeleft)="myswipeleft(employee)">

或者:

<div (panstart)="onPanStart($event)" (panmove)="onPan($event)">

参考:https://saschwarz.github.io/angular2-gestures-slides/#/

答案 3 :(得分:1)

我根据@Elvis Metodiev 的回答和@pikiou 创建了一个指令:

<块引用>

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();
                }
            }
        }
    }
}
<块引用>

tour.component.component.ts

<div
  ...
  swipe
  (next)="onRotateNext()"
  (previous)="onRotatePrevious()"
>
...
</div>

答案 4 :(得分:0)

我设法提出了一种“随处可写”类型的函数,我将其放置在名为“ gestures”的目录中,然后创建了一个名为“ swipe.ts”的文件,并将其放入其中。

let swipeCoord = [0, 0];
let swipeTime = new Date().getTime();

export function 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') {
        swipeCoord = coord;
        swipeTime = time;
    } else if (when === 'end') {
        const direction = [coord[0] - swipeCoord[0], coord[1] - swipeCoord[1]];
        const duration = time - 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') {
                alert('swipe next');
            } else {
                alert('swipe prev');
            }
        }
    }
}

然后导入所需的组件,如下所示:

import {swipe} from '../../gestures/swipe';

并创建一个名为:

的函数
onSwipe(e: TouchEvent, when: string) {
        swipe(e, when);
    }

在所需组件的HTML中,执行以下操作:

    <div (touchstart)="onSwipe($event, 'start')"
         (touchend)="onSwipe($event, 'end')">

       <!-- whatever content you have goes here -->

    </div>

PS-信用归@pikiou所有。我只是想出了更高的抽象水平,对我而言,这更有意义。