310 lines
12 KiB
Dart
310 lines
12 KiB
Dart
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import 'package:flutter/material.dart';
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import 'dialog_bean.dart';
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import 'navigator_manager.dart';
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/// @desc 统一弹窗（包含 showDialog、showModalBottomSheet）
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class DialogManager {
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// 工厂模式 : 单例公开访问点
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factory DialogManager() => _getInstance()!;
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// static DialogManager get instance => _getInstance();
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// 静态私有成员，没有初始化
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static DialogManager? _instance;
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///弹窗数据（待显示）
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late List<DialogBean> _dialogList;
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// ///当前正在显示的弹窗
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// DialogBean showDialogBean;
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///已显示过或正在显示的弹窗数据，还未被回调清除
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///已经显示过的弹窗，不能用一个DialogBean
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///(因为showDialogBean在对话 pop 是会赋为空，一个正要显示，一个取消的回调过来又重新给设为空了。)
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late List<DialogBean> _hasShowDialogList;
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///是否有系统弹窗正在显示,例如系统权限申请弹窗
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late bool isSystemDialogShowing;
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// 私有构造函数
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DialogManager._internal() {
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// 初始化
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_dialogList = [];
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_hasShowDialogList = [];
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isSystemDialogShowing = false;
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}
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// 静态、同步、私有访问点
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static DialogManager? _getInstance() {
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if (_instance == null) {
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_instance = DialogManager._internal();
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}
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return _instance;
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}
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///高优先级，回收取消正在显示的弹窗
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static const String popRecycle = "popRecycle";
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///其它地方触发取消正在显示的调窗,且不自动显示下一个
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static const String popRecycleAndNotNext = "popRecycleAndNotNext";
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///取消弹窗，但不自动显示下一个
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static const String popNotNext = "popNotNext";
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///增加弹窗
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void add(DialogBean bean) {
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print("dialog add ${bean.dialogId}");
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//对于 highClear 和 highClearAll则加入时要清掉其它低优先级弹窗,必须放在 show 前。假如在 add中，可能低优先级的在后台添加的
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switch (bean.dialogPriority) {
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case DialogPriority.highClear:
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case DialogPriority.highClearAll:
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//移除其它低优先级弹窗数据,(不清除正显示的。在 show 里面再清除&& !hasShow(item.dialogId),也可以在后台处理)
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_dialogList.removeWhere((item) => item.priority < bean.priority);
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break;
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default:
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break;
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}
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//去掉重复弹窗（待显示的与顶层正在显示的弹窗）
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bool hasDialog = _getAllDialogBean().any((dialogBean) => bean.dialogId == dialogBean.dialogId);
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//没有重复的，且栈中没有 highClear 等优先级的弹窗,或者 clearBean小于等于bean.priority
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if (!hasDialog) {
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DialogBean? clearBean = _getHighClearDialogBean();
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if (clearBean == null || bean.priority >= clearBean.priority) {
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_dialogList.add(bean);
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}
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}
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//根据优先级进行排序:降序
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_dialogList.sort((a, b) => b.priority.compareTo(a.priority));
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}
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///显示弹窗,不能返回 Future，不然在同时 show两次时重叠 DialogManager()..add()..show;DialogManager()..add()..show;
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void show(BuildContext context) {
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print("dialog show $_dialogList");
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//如果有系统弹窗正在显示，则不显示
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if (isSystemDialogShowing) {
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return;
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}
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//如果待显示数组为空
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if (_dialogList.isEmpty) {
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return;
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}
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//对于 highClean 和 highCleanAll则加入时要清掉其它低优先级弹窗,必须放在 show 前。假如在 add中，可能低优先级的在后台添加的
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// if (bean != null) {
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// //移除其它低优先级弹窗数据
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// _dialogList.removeWhere((item) => item.priority < bean.priority);
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// }
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//已经有正在显示的弹窗且是在栈顶层显示(showDialogBean != null && 不能加入此判断，在显示强升时碰到的，因为showDialogBean在对话 pop 是会赋为空。所以导致这里不准，一个正在显示，一个取消的回调过来又重新给设为空了。)
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if (NavigatorManager().isTopDialog() && _hasShowDialogList.isNotEmpty) {
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DialogBean? hasShowDialogBean = getShowingDialog();
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print("当前有正在显示的弹窗$hasShowDialogBean");
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DialogBean? bean;
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//已有显示的弹窗，且high 弹窗在当前页显示，且已显示的弹窗优先级低于high级弹窗
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//highClear 和 highClearAll 不用管显示页面 所以不要这个判断,这里_getHighClearDialogBean取所有的（包括正在显示的）
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if ((bean = _getHighClearDialogBean(beans: _dialogList)) != null && _canShow(bean) && (hasShowDialogBean!.priority < bean!.priority)) {
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//如果当前加入的弹窗是 highClear,则清掉所有弹窗(包括当前正在显示的，以及未显示的)
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print("清除正在显示的弹窗${bean.dialogPriority}");
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Navigator.pop(context);
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} else if (((bean = _getDialogBeanByPriority(DialogPriority.high, beans: _dialogList)) != null ||
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(bean = _getDialogBeanByPriority(DialogPriority.normal, beans: _dialogList)) != null) && //已有显示的弹窗，且high 弹窗在当前页显示，且已显示的弹窗优先级低于high级弹窗
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_canShow(bean) &&
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hasShowDialogBean!.priority < bean!.priority) {
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//如果当前加入的弹窗是 high,则回收当前正在显示的弹窗。
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print("回收正在显示的弹窗${bean.dialogPriority}");
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Navigator.pop(context, popRecycle);
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//不能在这里把弹窗直接回收，因为在使用 pop 会调用whenComplete会清掉当前显示的弹窗。所以要到whenComplete 中去处理
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}
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return;
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}
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//查找当前页面可显示的弹窗数据
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DialogBean showDialogBean;
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try {
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showDialogBean = _dialogList.firstWhere((bean) => _canShow(bean));
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_hasShowDialogList.add(showDialogBean);
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//新从数组中移动，因为回调中再移动可能会出现提交成功后显示一个提示框，导致一直显示提交框，不会消失
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_dialogList.remove(showDialogBean);
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print("显示的dialog =$showDialogBean");
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switch (showDialogBean.dialogType!) {
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case DialogType.dialog:
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showDialog(
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context: context,
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barrierDismissible: false,
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builder: (BuildContext context) {
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return showDialogBean.createDialogWidget!();
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},
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).then((obj) {
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_handlePopResult(context, obj);
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});
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break;
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case DialogType.bottomSheet:
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showModalBottomSheet(
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backgroundColor: Color(0x00FFFFFF),
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context: context,
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isDismissible: false,
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enableDrag: false,
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isScrollControlled: true,
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builder: (BuildContext context) {
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return showDialogBean.createDialogWidget!();
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},
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).then((obj) {
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_handlePopResult(context, obj);
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});
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break;
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case DialogType.bottomScrollSheet:
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showModalBottomSheet(
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backgroundColor: Color(0x00FFFFFF),
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context: context,
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isScrollControlled: true,
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builder: (BuildContext context) {
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return showDialogBean.createDialogWidget!();
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},
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).then((obj) {
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_handlePopResult(context, obj);
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});
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break;
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}
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} catch (e) {
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//没有找到可显示的弹窗
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}
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}
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void _handlePopResult(BuildContext context, dynamic obj) {
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//取消第一个
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DialogBean dismissBean = _hasShowDialogList[0];
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print("消失的dialog =$dismissBean,接收回调结果:$obj");
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//取消第一个
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_hasShowDialogList.remove(dismissBean);
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//如果是从 high 弹窗回收或外部手动 pop的话，则重新添加回数组
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if (obj == popRecycle || obj == popRecycleAndNotNext) {
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_dialogList.add(dismissBean);
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}
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// widget 中可能会先 pop ，再 push,这里显示下一个时，通过顶层路由来判断,不能通过当前显示的页面来判断。
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if (obj != popRecycleAndNotNext && obj != popNotNext) {
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show(context);
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}
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}
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///弹窗是否正在显示
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bool isShowing(String? dialogId) {
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DialogBean? dialogBean = getShowingDialog();
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if (dialogBean != null && dialogId == dialogBean.dialogId) {
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return true;
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}
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return false;
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}
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///取得在正显示的弹窗
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DialogBean? getShowingDialog() {
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if (_hasShowDialogList.isNotEmpty && NavigatorManager().isTopDialog()) {
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return _hasShowDialogList[_hasShowDialogList.length - 1];
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}
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return null;
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}
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///显示系统弹窗，必须与 dismiss 成对使用
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void showSystemDialog(BuildContext context) {
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//回收正在显示的弹窗
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pop(context, result: popRecycleAndNotNext);
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//正在显示系统弹窗
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isSystemDialogShowing = true;
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}
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///隐藏系统弹窗，必须与 show 成对使用
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void dismissSystemDialog(BuildContext context) {
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//正在显示系统弹窗
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isSystemDialogShowing = false;
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//系统弹窗消失，续续显示其它弹窗
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show(context);
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}
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///弹窗栈中是否此弹窗
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bool hasShow(String dialogId) {
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return _dialogList.any((bean) => dialogId == bean.dialogId);
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}
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///清除已经显示的弹窗，系统权限弹窗时回收到其它弹窗
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///[result] 默认回收弹窗，不显示下一个
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void pop(BuildContext context, {String? result}) {
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if (_hasShowDialogList.isNotEmpty && NavigatorManager().isTopDialog()) {
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Navigator.pop(context, result);
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}
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}
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///清除已经显示的弹窗，系统权限弹窗时回收到其它弹窗
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///[result] 默认回收弹窗，不显示下一个
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void popByDialogId(BuildContext context, String dialogId, {String? result}) {
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if (isShowing(dialogId)) {
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Navigator.pop(context, result);
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}
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}
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///清除已经显示的弹窗或待显示的弹窗，例如登录超时打开登录时、或者退出登录
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void popAndClear(BuildContext context) {
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//如果没有 highClear或 highClearAll.
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DialogBean? dialogBean = _getHighClearDialogBean();
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if (dialogBean == null) {
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_dialogList.clear();
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pop(context, result: popNotNext);
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}
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}
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///是否可显示，未指定页面，或者指定的页面在顶层
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bool _canShow(DialogBean? dialogBean) {
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if (dialogBean == null) {
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return false;
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}
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String? pageRouter = dialogBean.pageRouter;
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//指定的页面在顶层
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return isEmpty(pageRouter) || NavigatorManager().isTopRouter(pageRouter!);
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}
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///按取得 clear 其它弹窗优先级的弹窗 bean
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DialogBean? _getHighClearDialogBean({List<DialogBean>? beans}) {
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DialogBean? bean = _getDialogBeanByPriority(DialogPriority.highClearAll, beans: beans);
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if (bean != null) {
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return bean;
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}
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bean = _getDialogBeanByPriority(DialogPriority.highClear, beans: beans);
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if (bean != null) {
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return bean;
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}
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return null;
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}
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///按弹窗优先级获取弹窗(默认包括待显示的及正在显示的)
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DialogBean? _getDialogBeanByPriority(DialogPriority priority, {List<DialogBean>? beans}) {
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try {
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return (beans ?? _getAllDialogBean()).firstWhere(
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(bean) => priority == bean.dialogPriority,
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);
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} catch (e) {
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return null;
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}
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/*return (beans ?? _getAllDialogBean()).firstWhereOrNull(
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(bean) => priority == bean.dialogPriority,
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);*/
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}
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///取得所有弹窗，包括待显示及正在显示的弹窗
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List<DialogBean> _getAllDialogBean() {
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List<DialogBean> all = [];
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DialogBean? showingDialogBean = getShowingDialog();
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if (getShowingDialog() != null) {
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all.add(showingDialogBean!);
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}
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all.addAll(_dialogList);
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return all;
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}
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bool isEmpty(String? s) {
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return s == null || s.isEmpty;
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}
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}
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