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import { Injectable} from '@angular/core';
import {Platform, ToastController, App, NavController, Tabs} from 'ionic-angular';
import {EmitService} from "./emit.service";
import {LogoutService} from "../secret/logout.service";
/**
* android返回按钮监听事件
**/
@Injectable()
export class BackButtonService {
//控制硬件返回按钮是否触发，默认false
backButtonPressed: boolean = false;
// 1.false 正常返回上一层，2.true，禁止返回上一层，3.result,返回列表页面
isDo = 'false';
constructor(public platform: Platform,private logoutSer:LogoutService,
public appCtrl: App, public eventEmitSer: EmitService,
public toastCtrl: ToastController) {
this.eventEmitSer.eventEmit.subscribe((value: any) => {
if(isNaN(value)){ //value为数字 代表消息
this.isDo = value;
}
});
}
//注册方法
registerBackButtonAction(tabRef: Tabs): void {
this.platform.registerBackButtonAction(() => {
// let activePortal = this.ionicApp._modalPortal.getActive() ||this.ionicApp._overlayPortal.getActive();
// let loadingPortal = this.ionicApp._loadingPortal.getActive();
// if (activePortal) {
// //其他的关闭
// activePortal.dismiss().catch(() => {
// });
// activePortal.onDidDismiss(() => {
// });
// return;
// }
// if (loadingPortal) {
// //loading的话，返回键无效
// activePortal.dismiss(()=>{})
// return;
// }
let activeNav: NavController = this.appCtrl.getActiveNavs()[0];
//如果可以返回上一页，则执行pop
if (activeNav.canGoBack()) {
if (this.isDo === 'false') { //正常返回
activeNav.pop();
}
if (this.isDo === 'result') {
let index = activeNav.length() - 2;
activeNav.remove(2, index)
}
} else {
if (tabRef == null || tabRef._selectHistory[tabRef._selectHistory.length - 1] === tabRef.getByIndex(0).id) {
//执行退出
this.showExit();
} else {
//选择首页第一个的标签
tabRef.select(0);
}
}
});
}
//退出应用方法
private showExit(): void {
//如果为true，退出
if (this.backButtonPressed) {
// this.logoutSer.logout();
this.platform.exitApp();
} else {
//第一次按，弹出Toast
this.toastCtrl.create({
message: '再按一次退出应用',
duration: 2000,
position: 'middle'
}).present();
//标记为true
this.backButtonPressed = true;
//两秒后标记为false，如果退出的话，就不会执行了
setTimeout(() => this.backButtonPressed = false, 2000);
}
}
}