FRAISEMOE-Addons-Installer-NEXT/source/core/download_manager.py

import os
import requests
import json
from collections import deque
from urllib.parse import urlparse
import re # Added for recursive search

from PySide6 import QtWidgets, QtCore
from PySide6.QtCore import Qt
from PySide6.QtGui import QIcon, QPixmap, QFont

from utils import msgbox_frame, HostsManager, resource_path
from data.config import APP_NAME, PLUGIN, GAME_INFO, UA, CONFIG_URL, DOWNLOAD_THREADS, DEFAULT_DOWNLOAD_THREAD_LEVEL
from workers import IpOptimizerThread
from core.cloudflare_optimizer import CloudflareOptimizer
from core.download_task_manager import DownloadTaskManager
from core.extraction_handler import ExtractionHandler

class DownloadManager:
    def __init__(self, main_window):
        """初始化下载管理器
        
        Args:
            main_window: 主窗口实例，用于访问UI和状态
        """
        self.main_window = main_window
        self.main_window.APP_NAME = APP_NAME  # 为了让子模块能够访问APP_NAME
        self.selected_folder = ""
        self.download_queue = deque()
        self.current_download_thread = None
        self.hosts_manager = HostsManager()
        
        # 添加下载线程级别
        self.download_thread_level = DEFAULT_DOWNLOAD_THREAD_LEVEL
        
        # 初始化子模块
        self.cloudflare_optimizer = CloudflareOptimizer(main_window, self.hosts_manager)
        self.download_task_manager = DownloadTaskManager(main_window, self.download_thread_level)
        self.extraction_handler = ExtractionHandler(main_window)
        
    def file_dialog(self):
        """显示文件夹选择对话框，选择游戏安装目录"""
        self.selected_folder = QtWidgets.QFileDialog.getExistingDirectory(
            self.main_window, f"选择游戏所在【上级目录】 {APP_NAME}"
        )
        if not self.selected_folder:
            QtWidgets.QMessageBox.warning(
                self.main_window, f"通知 - {APP_NAME}", "\n未选择任何目录,请重新选择\n"
            )
            return
        
        # 将按钮文本设为安装中状态
        self.main_window.ui.start_install_text.setText("正在安装")
        
        # 禁用整个主窗口，防止用户操作
        self.main_window.setEnabled(False)
        
        self.download_action()

    def get_install_paths(self):
        """获取所有游戏版本的安装路径"""
        # 使用改进的目录识别功能
        game_dirs = self.main_window.game_detector.identify_game_directories_improved(self.selected_folder)
        install_paths = {}
        
        debug_mode = self.is_debug_mode()
        
        for game, info in GAME_INFO.items():
            if game in game_dirs:
                # 如果找到了游戏目录，使用它
                game_dir = game_dirs[game]
                install_path = os.path.join(game_dir, os.path.basename(info["install_path"]))
                install_paths[game] = install_path
                if debug_mode:
                    print(f"DEBUG: 使用识别到的游戏目录 {game}: {game_dir}")
                    print(f"DEBUG: 安装路径设置为: {install_path}")
                    
        return install_paths

    def is_debug_mode(self):
        """检查是否处于调试模式"""
        if hasattr(self.main_window, 'ui_manager') and self.main_window.ui_manager:
            if hasattr(self.main_window.ui_manager, 'debug_action') and self.main_window.ui_manager.debug_action:
                return self.main_window.ui_manager.debug_action.isChecked()
        return False

    def get_download_url(self) -> dict:
        """获取所有游戏版本的下载链接
        
        Returns:
            dict: 包含游戏版本和下载URL的字典
        """
        try:
            if self.main_window.cloud_config:
                if self.is_debug_mode():
                    print("--- Using pre-fetched cloud config ---")
                config_data = self.main_window.cloud_config
            else:
                # 如果没有预加载的配置，则同步获取
                headers = {"User-Agent": UA}
                response = requests.get(CONFIG_URL, headers=headers, timeout=10)
                response.raise_for_status()
                config_data = response.json()

            if not config_data:
                raise ValueError("未能获取或解析配置数据")

            if self.is_debug_mode():
                print(f"DEBUG: Parsed JSON data: {json.dumps(config_data, indent=2)}")

            # 统一处理URL提取，确保返回扁平化的字典
            urls = {}
            for i in range(4):
                key = f"vol.{i+1}.data"
                if key in config_data and "url" in config_data[key]:
                    urls[f"vol{i+1}"] = config_data[key]["url"]
            
            if "after.data" in config_data and "url" in config_data["after.data"]:
                urls["after"] = config_data["after.data"]["url"]

            # 检查是否成功提取了所有URL
            if len(urls) != 5:
                missing_keys_map = {
                    f"vol{i+1}": f"vol.{i+1}.data" for i in range(4)
                }
                missing_keys_map["after"] = "after.data"
                
                extracted_keys = set(urls.keys())
                all_keys = set(missing_keys_map.keys())
                missing_simple_keys = all_keys - extracted_keys
                
                missing_original_keys = [missing_keys_map[k] for k in missing_simple_keys]
                raise ValueError(f"配置文件缺少必要的键: {', '.join(missing_original_keys)}")

            if self.is_debug_mode():
                print(f"DEBUG: Extracted URLs: {urls}")
                print("--- Finished getting download URL successfully ---")
            return urls

        except requests.exceptions.RequestException as e:
            status_code = e.response.status_code if e.response is not None else "未知"
            try:
                error_response = e.response.json() if e.response else {}
                json_title = error_response.get("title", "无错误类型")
                json_message = error_response.get("message", "无附加错误信息")
            except (ValueError, AttributeError):
                json_title = "配置文件异常，无法解析错误类型"
                json_message = "配置文件异常，无法解析错误信息"

            if self.is_debug_mode():
                print(f"ERROR: Failed to get download config due to RequestException: {e}")
            
            QtWidgets.QMessageBox.critical(
                self.main_window,
                f"错误 - {APP_NAME}",
                f"\n下载配置获取失败\n\n【HTTP状态】：{status_code}\n【错误类型】：{json_title}\n【错误信息】：{json_message}\n",
            )
            return {}
        except ValueError as e:
            if self.is_debug_mode():
                print(f"ERROR: Failed to parse download config due to ValueError: {e}")

            QtWidgets.QMessageBox.critical(
                self.main_window,
                f"错误 - {APP_NAME}",
                f"\n配置文件格式异常\n\n【错误信息】：{e}\n",
            )
            return {}

    def download_action(self):
        """开始下载流程"""
        # 主窗口在file_dialog中已被禁用
        
        # 清空下载历史记录
        self.main_window.download_queue_history = []
        
        # 使用改进的目录识别功能
        game_dirs = self.main_window.game_detector.identify_game_directories_improved(self.selected_folder)
        
        debug_mode = self.is_debug_mode()
        if debug_mode:
            print(f"DEBUG: 开始下载流程, 识别到 {len(game_dirs)} 个游戏目录")
        
        # 检查是否找到任何游戏目录
        if not game_dirs:
            if debug_mode:
                print("DEBUG: 未识别到任何游戏目录，设置目录未找到错误")
            # 设置特定的错误类型，以便在按钮点击处理中区分处理
            self.main_window.last_error_message = "directory_not_found"
            QtWidgets.QMessageBox.warning(
                self.main_window, 
                f"目录错误 - {APP_NAME}", 
                "\n未能识别到任何游戏目录。\n\n请确认您选择的是游戏的上级目录，并且该目录中包含NEKOPARA系列游戏文件夹。\n"
            )
            # 恢复主窗口
            self.main_window.setEnabled(True)
            self.main_window.ui.start_install_text.setText("开始安装")
            return
            
        # 显示哈希检查窗口
        self.main_window.hash_msg_box = self.main_window.hash_manager.hash_pop_window(check_type="pre")

        # 执行预检查，先判断哪些游戏版本已安装了补丁
        install_paths = self.get_install_paths()
        
        self.main_window.hash_thread = self.main_window.create_hash_thread("pre", install_paths)
        # 使用lambda连接，传递game_dirs参数
        self.main_window.hash_thread.pre_finished.connect(
            lambda updated_status: self.on_pre_hash_finished_with_dirs(updated_status, game_dirs)
        )
        self.main_window.hash_thread.start()
        
    def on_pre_hash_finished_with_dirs(self, updated_status, game_dirs):
        """优化的哈希预检查完成处理，带有游戏目录信息
        
        Args:
            updated_status: 更新后的安装状态
            game_dirs: 识别到的游戏目录
        """
        self.main_window.installed_status = updated_status
        if self.main_window.hash_msg_box and self.main_window.hash_msg_box.isVisible():
            self.main_window.hash_msg_box.accept()
            self.main_window.hash_msg_box = None
            
        debug_mode = self.is_debug_mode()
        
        # 临时启用窗口以显示选择对话框
        self.main_window.setEnabled(True)
        
        # 获取可安装的游戏版本列表（尚未安装补丁的版本）
        installable_games = []
        already_installed_games = []
        for game_version, game_dir in game_dirs.items():
            if self.main_window.installed_status.get(game_version, False):
                if debug_mode:
                    print(f"DEBUG: {game_version} 已安装补丁，不需要再次安装")
                already_installed_games.append(game_version)
            else:
                if debug_mode:
                    print(f"DEBUG: {game_version} 未安装补丁，可以安装")
                installable_games.append(game_version)
        
        # 显示状态消息
        status_message = ""
        if already_installed_games:
            status_message += f"已安装补丁的游戏：\n{chr(10).join(already_installed_games)}\n\n"
            
        if not installable_games:
            # 如果没有可安装的游戏
            QtWidgets.QMessageBox.information(
                self.main_window, 
                f"信息 - {APP_NAME}", 
                f"\n所有检测到的游戏都已安装补丁。\n\n{status_message}"
            )
            # 恢复主窗口
            self.main_window.setEnabled(True)
            self.main_window.ui.start_install_text.setText("开始安装")
            return
            
        # 如果有可安装的游戏版本，让用户选择
        from PySide6.QtWidgets import QInputDialog, QListWidget, QVBoxLayout, QDialog, QLabel, QPushButton, QAbstractItemView, QHBoxLayout
        
        # 创建自定义选择对话框
        dialog = QDialog(self.main_window)
        dialog.setWindowTitle("选择要安装的游戏")
        dialog.resize(400, 300)
        
        layout = QVBoxLayout(dialog)
        
        # 先显示已安装补丁的游戏
        if already_installed_games:
            already_installed_label = QLabel("已安装补丁的游戏:", dialog)
            already_installed_label.setFont(QFont(already_installed_label.font().family(), already_installed_label.font().pointSize(), QFont.Bold))
            layout.addWidget(already_installed_label)
            
            already_installed_list = QLabel(chr(10).join(already_installed_games), dialog)
            layout.addWidget(already_installed_list)
            
            # 添加一些间距
            layout.addSpacing(10)
        
        # 添加"请选择你需要安装补丁的游戏"的标签
        info_label = QLabel("请选择你需要安装补丁的游戏:", dialog)
        info_label.setFont(QFont(info_label.font().family(), info_label.font().pointSize(), QFont.Bold))
        layout.addWidget(info_label)
        
        # 添加列表控件
        list_widget = QListWidget(dialog)
        list_widget.setSelectionMode(QAbstractItemView.SelectionMode.ExtendedSelection)  # 允许多选
        for game in installable_games:
            list_widget.addItem(game)
        layout.addWidget(list_widget)
        
        # 添加全选按钮
        select_all_btn = QPushButton("全选", dialog)
        select_all_btn.clicked.connect(lambda: list_widget.selectAll())
        layout.addWidget(select_all_btn)
        
        # 添加确定和取消按钮
        buttons_layout = QHBoxLayout()
        ok_button = QPushButton("确定", dialog)
        cancel_button = QPushButton("取消", dialog)
        buttons_layout.addWidget(ok_button)
        buttons_layout.addWidget(cancel_button)
        layout.addLayout(buttons_layout)
        
        # 连接按钮事件
        ok_button.clicked.connect(dialog.accept)
        cancel_button.clicked.connect(dialog.reject)
        
        # 显示对话框并等待用户选择
        result = dialog.exec()
        
        if result != QDialog.DialogCode.Accepted or list_widget.selectedItems() == []:
            # 用户取消或未选择任何游戏
            self.main_window.setEnabled(True)
            self.main_window.ui.start_install_text.setText("开始安装")
            return
            
        # 获取用户选择的游戏
        selected_games = [item.text() for item in list_widget.selectedItems()]
        if debug_mode:
            print(f"DEBUG: 用户选择了以下游戏进行安装: {selected_games}")
            
        # 过滤game_dirs，只保留选中的游戏
        selected_game_dirs = {game: game_dirs[game] for game in selected_games if game in game_dirs}
        
        # 重新禁用窗口
        self.main_window.setEnabled(False)

        # 获取下载配置
        config = self.get_download_url()
        if not config:
            QtWidgets.QMessageBox.critical(
                self.main_window, f"错误 - {APP_NAME}", "\n网络状态异常或服务器故障，请重试\n"
            )
            # 网络故障时，恢复主窗口
            self.main_window.setEnabled(True)
            self.main_window.ui.start_install_text.setText("开始安装")
            return

        # 填充下载队列，传入选定的游戏目录
        self._fill_download_queue(config, selected_game_dirs)

        # 如果没有需要下载的内容，直接进行最终校验
        if not self.download_queue:
            self.main_window.after_hash_compare()
            return
        
        # 询问是否使用Cloudflare加速
        self._show_cloudflare_option()

    def _fill_download_queue(self, config, game_dirs):
        """填充下载队列
        
        Args:
            config: 包含下载URL的配置字典
            game_dirs: 包含游戏文件夹路径的字典
        """
        # 清空现有队列
        self.download_queue.clear()
        
        # 创建下载历史记录列表，用于跟踪本次安装的游戏
        if not hasattr(self.main_window, 'download_queue_history'):
            self.main_window.download_queue_history = []
        
        debug_mode = self.is_debug_mode()
        if debug_mode:
            print(f"DEBUG: 填充下载队列, 游戏目录: {game_dirs}")
        
        # 添加nekopara 1-4
        for i in range(1, 5):
            game_version = f"NEKOPARA Vol.{i}"
            # 只处理game_dirs中包含的游戏版本(如果用户选择了特定版本)
            if game_version in game_dirs and not self.main_window.installed_status.get(game_version, False):
                url = config.get(f"vol{i}")
                if not url: continue
                
                # 获取识别到的游戏文件夹路径
                game_folder = game_dirs[game_version]
                if debug_mode:
                    print(f"DEBUG: 使用识别到的游戏目录 {game_version}: {game_folder}")
                
                _7z_path = os.path.join(PLUGIN, f"vol.{i}.7z")
                plugin_path = os.path.join(PLUGIN, GAME_INFO[game_version]["plugin_path"])
                self.download_queue.append((url, game_folder, game_version, _7z_path, plugin_path))
                # 记录到下载历史
                self.main_window.download_queue_history.append(game_version)

        # 添加nekopara after
        game_version = "NEKOPARA After"
        # 只处理game_dirs中包含的游戏版本(如果用户选择了特定版本)
        if game_version in game_dirs and not self.main_window.installed_status.get(game_version, False):
            url = config.get("after")
            if url:
                # 获取识别到的游戏文件夹路径
                game_folder = game_dirs[game_version]
                if debug_mode:
                    print(f"DEBUG: 使用识别到的游戏目录 {game_version}: {game_folder}")
                
                _7z_path = os.path.join(PLUGIN, "after.7z")
                plugin_path = os.path.join(PLUGIN, GAME_INFO[game_version]["plugin_path"])
                self.download_queue.append((url, game_folder, game_version, _7z_path, plugin_path))
                # 记录到下载历史
                self.main_window.download_queue_history.append(game_version)
                
    def _show_cloudflare_option(self):
        """显示Cloudflare加速选择对话框"""
        # 临时启用窗口以显示对话框
        self.main_window.setEnabled(True)
        
        msg_box = QtWidgets.QMessageBox(self.main_window)
        msg_box.setWindowTitle(f"下载优化 - {APP_NAME}")
        msg_box.setText("是否愿意通过Cloudflare加速来优化下载速度？\n\n这将临时修改系统的hosts文件，并需要管理员权限。\n如您的杀毒软件提醒有软件正在修改hosts文件，请注意放行。")
        
        # 设置Cloudflare图标
        cf_icon_path = resource_path("IMG/ICO/cloudflare_logo_icon.ico")
        if os.path.exists(cf_icon_path):
            cf_pixmap = QPixmap(cf_icon_path)
            if not cf_pixmap.isNull():
                msg_box.setWindowIcon(QIcon(cf_pixmap))
                msg_box.setIconPixmap(cf_pixmap.scaled(64, 64, Qt.AspectRatioMode.KeepAspectRatio, 
                                                    Qt.TransformationMode.SmoothTransformation))
        else:
            msg_box.setIcon(QtWidgets.QMessageBox.Icon.Question)
        
        yes_button = msg_box.addButton("是，开启加速", QtWidgets.QMessageBox.ButtonRole.YesRole)
        no_button = msg_box.addButton("否，直接下载", QtWidgets.QMessageBox.ButtonRole.NoRole)
        cancel_button = msg_box.addButton("取消安装", QtWidgets.QMessageBox.ButtonRole.RejectRole)
        
        msg_box.exec()
        
        clicked_button = msg_box.clickedButton()
        if clicked_button == cancel_button:
            # 用户取消了安装，保持主窗口启用
            self.main_window.setEnabled(True)
            self.main_window.ui.start_install_text.setText("开始安装")
            self.download_queue.clear()  # 清空下载队列
            return
        
        # 用户点击了继续按钮，重新禁用主窗口
        self.main_window.setEnabled(False)
        
        use_optimization = clicked_button == yes_button
        
        if use_optimization and not self.cloudflare_optimizer.is_optimization_done():
            first_url = self.download_queue[0][0]
            # 保存当前URL供CloudflareOptimizer使用
            self.main_window.current_url = first_url
            # 使用CloudflareOptimizer进行IP优化
            self.cloudflare_optimizer.start_ip_optimization(first_url)
            # 等待CloudflareOptimizer的回调
            # on_optimization_finished会被调用，然后决定是否继续
            QtCore.QTimer.singleShot(100, self.check_optimization_status)
        else:
            # 如果用户选择不优化，或已经优化过，直接开始下载
            self.next_download_task()
    
    def check_optimization_status(self):
        """检查IP优化状态并继续下载流程"""
        # 必须同时满足：优化已完成且倒计时已结束
        if self.cloudflare_optimizer.is_optimization_done() and self.cloudflare_optimizer.is_countdown_finished():
            self.next_download_task()
        else:
            # 否则，继续等待100ms后再次检查
            QtCore.QTimer.singleShot(100, self.check_optimization_status)
                        
    def next_download_task(self):
        """处理下载队列中的下一个任务"""
        if not self.download_queue:
            self.main_window.after_hash_compare()
            return
            
        # 检查下载线程是否仍在运行，以避免在手动停止后立即开始下一个任务
        if self.download_task_manager.current_download_thread and self.download_task_manager.current_download_thread.isRunning():
            return
        
        # 获取下一个下载任务并开始
        url, game_folder, game_version, _7z_path, plugin_path = self.download_queue.popleft()
        self.download_setting(url, game_folder, game_version, _7z_path, plugin_path)

    def download_setting(self, url, game_folder, game_version, _7z_path, plugin_path):
        """准备下载特定游戏版本
        
        Args:
            url: 下载URL
            game_folder: 游戏文件夹路径
            game_version: 游戏版本名称
            _7z_path: 7z文件保存路径
            plugin_path: 插件路径
        """
        # 使用改进的目录识别获取安装路径
        install_paths = self.get_install_paths()
        
        debug_mode = self.is_debug_mode()
        if debug_mode:
            print(f"DEBUG: 准备下载游戏 {game_version}")
            print(f"DEBUG: 游戏文件夹: {game_folder}")
            
        # 游戏可执行文件已在填充下载队列时验证过，不需要再次检查
        # 因为game_folder是从已验证的game_dirs中获取的
        game_exe_exists = True
        
        # 检查游戏是否已安装
        if (
            not game_exe_exists
            or self.main_window.installed_status[game_version]
        ):
            if debug_mode:
                print(f"DEBUG: 跳过下载游戏 {game_version}")
                print(f"DEBUG: 游戏存在: {game_exe_exists}")
                print(f"DEBUG: 已安装补丁: {self.main_window.installed_status[game_version]}")
            self.main_window.installed_status[game_version] = False if not game_exe_exists else True
            self.next_download_task()
            return
        
        # 创建进度窗口并开始下载
        self.main_window.progress_window = self.main_window.create_progress_window()
        
        # 从CloudflareOptimizer获取已优选的IP
        self.optimized_ip = self.cloudflare_optimizer.get_optimized_ip()
        if self.optimized_ip:
            print(f"已为 {game_version} 获取到优选IP: {self.optimized_ip}")
        else:
            print(f"未能为 {game_version} 获取优选IP，将使用默认线路。")

        # 使用DownloadTaskManager开始下载
        self.download_task_manager.start_download(url, _7z_path, game_version, game_folder, plugin_path)

    # 连接到主窗口中的下载完成处理函数
    def on_download_finished(self, success, error, url, game_folder, game_version, _7z_path, plugin_path):
        """下载完成后的处理
        
        Args:
            success: 是否下载成功
            error: 错误信息
            url: 下载URL
            game_folder: 游戏文件夹路径
            game_version: 游戏版本名称
            _7z_path: 7z文件保存路径
            plugin_path: 插件路径
        """
        # 关闭进度窗口
        if self.main_window.progress_window and self.main_window.progress_window.isVisible():
            self.main_window.progress_window.reject()
            self.main_window.progress_window = None

        # 处理下载失败
        if not success:
            print(f"--- Download Failed: {game_version} ---")
            print(error)
            print("------------------------------------")
            
            # 临时启用窗口以显示对话框
            self.main_window.setEnabled(True)
            
            msg_box = QtWidgets.QMessageBox(self.main_window)
            msg_box.setWindowTitle(f"下载失败 - {APP_NAME}")
            msg_box.setText(f"\n文件获取失败: {game_version}\n错误: {error}\n\n是否重试？")
            
            retry_button = msg_box.addButton("重试", QtWidgets.QMessageBox.ButtonRole.YesRole)
            next_button = msg_box.addButton("下一个", QtWidgets.QMessageBox.ButtonRole.NoRole)
            end_button = msg_box.addButton("结束", QtWidgets.QMessageBox.ButtonRole.RejectRole)
            
            msg_box.exec()
            clicked_button = msg_box.clickedButton()

            # 处理用户选择
            if clicked_button == retry_button:
                # 重试，重新禁用窗口
                self.main_window.setEnabled(False)
                self.download_setting(url, game_folder, game_version, _7z_path, plugin_path)
            elif clicked_button == next_button:
                # 继续下一个，重新禁用窗口
                self.main_window.setEnabled(False)
                self.next_download_task()
            else:
                # 结束，保持窗口启用
                self.on_download_stopped()
            return

        # 下载成功，使用ExtractionHandler开始解压缩
        self.extraction_handler.start_extraction(_7z_path, game_folder, plugin_path, game_version)
        # extraction_handler的回调会处理下一步操作

    def on_extraction_finished(self, continue_download):
        """解压完成后的回调，决定是否继续下载队列
        
        Args:
            continue_download: 是否继续下载队列中的下一个任务
        """
        if continue_download:
            # 继续下一个下载任务
            self.next_download_task()
        else:
            # 清空剩余队列并显示结果
            self.download_queue.clear()
            self.main_window.show_result()

    def on_download_stopped(self):
        """当用户点击停止按钮或选择结束时调用的函数"""
        # 停止IP优化线程
        self.cloudflare_optimizer.stop_optimization()

        # 停止当前可能仍在运行的下载线程
        self.download_task_manager.stop_download()
            
        # 清空下载队列，因为用户决定停止
        self.download_queue.clear()
        
        # 确保进度窗口已关闭
        if hasattr(self.main_window, 'progress_window') and self.main_window.progress_window:
            if self.main_window.progress_window.isVisible():
                self.main_window.progress_window.reject()
            self.main_window.progress_window = None

        # 退出应用程序
        print("下载已全部停止。")
        
        # 恢复主窗口状态
        self.main_window.setEnabled(True)
        self.main_window.ui.start_install_text.setText("开始安装")
        
        # 显示取消安装的消息
        QtWidgets.QMessageBox.information(
            self.main_window,
            f"已取消 - {APP_NAME}",
            "\n已成功取消安装进程。\n"
        )

    # 以下方法委托给DownloadTaskManager
    def get_download_thread_count(self):
        """获取当前下载线程设置对应的线程数"""
        return self.download_task_manager.get_download_thread_count()
        
    def set_download_thread_level(self, level):
        """设置下载线程级别"""
        return self.download_task_manager.set_download_thread_level(level)
    
    def show_download_thread_settings(self):
        """显示下载线程设置对话框"""
        return self.download_task_manager.show_download_thread_settings()