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Beta-0.1.4.py

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+import sys
+import requests
+import pygame
+import os
+from PyQt5.QtWidgets import (
+    QApplication, QMainWindow, QWidget, QVBoxLayout, QHBoxLayout,
+    QTreeWidget, QTreeWidgetItem, QLineEdit, QLabel, QPushButton,
+    QSplitter, QTabWidget, QTextEdit, QMessageBox, QAction,
+    QSlider, QButtonGroup, QProgressDialog
+)
+from PyQt5.QtCore import Qt, pyqtSignal, QThread, QTimer, QObject
+from PyQt5.QtGui import QColor, QBrush, QFont, QTextDocument
+
+# --- 初始化 pygame 音频模块 ---
+pygame.mixer.init()
+
+# --- 配置区 ---
+BASE_URL = "https://shanwogou.cn/audio/"
+API_URL = BASE_URL + "api.php"
+# 本地音频存储路径（自动创建./audio目录）
+AUDIO_SAVE_DIR = "./audio"
+os.makedirs(AUDIO_SAVE_DIR, exist_ok=True)
+# 音乐分类配置（重命名+颜色）
+CATEGORY_CONFIG = {
+    'all': {'name': '全部音乐', 'color': '#b89e81', 'text_color': '#5d4037'},
+    'cantonese': {'name': '粤语歌曲', 'color': '#c8e6c9', 'text_color': '#2e7d32'},
+    'mandarin': {'name': '国语歌曲', 'color': '#fff3e0', 'text_color': '#e65100'},
+    'waiyu': {'name': '外语歌曲', 'color': '#e3f2fd', 'text_color': '#0d47a1'},
+    'classic': {'name': '经典老歌', 'color': '#efebe9', 'text_color': '#3e2723'},
+    'other': {'name': '其他音乐', 'color': '#f3e5f5', 'text_color': '#6a1b9a'}
+}
+
+# --- API 交互模块 ---
+def fetch_api_data(url, params=None):
+    """通用 GET 请求函数，解析 JSON 响应"""
+    try:
+        response = requests.get(url, params=params, timeout=15)
+        response.raise_for_status()  # 触发 HTTP 错误（如 404/500）
+        return response.json()
+    except requests.exceptions.RequestException as e:
+        print(f"API 请求失败: {str(e)}")
+        return None
+
+def get_all_music():
+    """获取所有音乐"""
+    return fetch_api_data(API_URL, params={"action": "getAllMusic"})
+
+def get_music_tags():
+    """获取所有音乐标签"""
+    return fetch_api_data(API_URL, params={"action": "getMusicTags"})
+
+def get_announcements():
+    """获取公告列表"""
+    return fetch_api_data(API_URL, params={"action": "getAnnouncements"})
+
+def get_music_url(music_id):
+    """获取音乐的直接播放地址（mp3 链接）"""
+    return fetch_api_data(API_URL, params={"action": "getMusicUrl", "id": music_id})
+
+# --- 下载线程（完整下载）---
+class DownloadThread(QThread):
+    """完整下载音乐文件的线程"""
+    progress_updated = pyqtSignal(int)  # 下载进度
+    download_complete = pyqtSignal(str)  # 下载完成信号（文件路径）
+    error_occurred = pyqtSignal(str)     # 错误信号
+
+    def __init__(self, music_id, music_title, music_artist):
+        super().__init__()
+        self.music_id = music_id
+        self.music_title = music_title
+        self.music_artist = music_artist
+        self.is_canceled = False
+        self.session = requests.Session()
+
+    def run(self):
+        try:
+            # 1. 获取音乐播放链接
+            music_url_data = get_music_url(self.music_id)
+            if not music_url_data or not music_url_data.get("success", False):
+                self.error_occurred.emit("未获取到有效的播放链接")
+                return
+
+            play_url = music_url_data["data"].get("play_url")
+            if not play_url:
+                self.error_occurred.emit("API 未返回直接播放地址（play_url）")
+                return
+
+            # 2. 准备文件路径
+            safe_title = "".join([c for c in self.music_title if c.isalnum() or c in ' _-'])
+            safe_artist = "".join([c for c in self.music_artist if c.isalnum() or c in ' _-'])
+            self.final_file = os.path.join(AUDIO_SAVE_DIR, f"{safe_artist} - {safe_title}.mp3")
+
+            # 3. 检查是否已下载
+            if os.path.exists(self.final_file):
+                self.download_complete.emit(self.final_file)
+                return
+
+            # 4. 开始完整下载
+            response = self.session.get(play_url, stream=True, timeout=30)
+            response.raise_for_status()
+
+            # 获取总文件大小
+            total_size = int(response.headers.get("content-length", 0))
+            if total_size == 0:
+                self.error_occurred.emit("无法获取文件大小，无法下载")
+                return
+
+            # 5. 写入文件
+            downloaded_size = 0
+            with open(self.final_file, "wb") as f:
+                for chunk in response.iter_content(chunk_size=8192):
+                    if self.is_canceled:  # 检查是否取消下载
+                        if os.path.exists(self.final_file):
+                            os.remove(self.final_file)
+                        return
+                    
+                    if chunk:
+                        f.write(chunk)
+                        downloaded_size += len(chunk)
+                        
+                        # 计算进度
+                        progress = int((downloaded_size / total_size) * 100)
+                        self.progress_updated.emit(progress)
+
+            # 6. 下载完成
+            if not self.is_canceled and os.path.exists(self.final_file):
+                self.download_complete.emit(self.final_file)
+
+        except Exception as e:
+            if not self.is_canceled:  # 只有非取消的错误才发送信号
+                self.error_occurred.emit(f"下载错误：{str(e)}")
+                # 清理不完整文件
+                if os.path.exists(self.final_file):
+                    try:
+                        os.remove(self.final_file)
+                    except:
+                        pass
+
+    def cancel(self):
+        """取消下载"""
+        self.is_canceled = True
+
+# --- 数据加载工作类 ---
+class DataLoadWorker(QObject):
+    """数据加载工作类（与主线程分离，避免UI卡顿）"""
+    music_loaded = pyqtSignal(dict)
+    tags_loaded = pyqtSignal(dict)
+    announcements_loaded = pyqtSignal(dict)
+    finished = pyqtSignal()
+
+    def run(self):
+        """加载音乐、标签、公告数据"""
+        # 1. 加载音乐
+        music_data = get_all_music()
+        self.music_loaded.emit(music_data)
+
+        # 2. 加载标签
+        tags_data = get_music_tags()
+        self.tags_loaded.emit(tags_data)
+
+        # 3. 加载公告
+        announcements_data = get_announcements()
+        self.announcements_loaded.emit(announcements_data)
+
+        # 4. 发送完成信号
+        self.finished.emit()
+
+# --- 主窗口类 ---
+class SunsetMusicApp(QMainWindow):
+    def __init__(self):
+        super().__init__()
+        self.setWindowTitle("落日音乐 for PC")
+        self.setGeometry(100, 100, 1200, 700)
+        self.setMinimumSize(1000, 600)  # 最小窗口尺寸
+
+        # 数据存储
+        self.all_music = []          # 所有音乐列表
+        self.filtered_music = []     # 筛选后音乐列表
+        self.current_playing_file = ""# 当前播放的文件路径
+        self.current_playing_music = None  # 当前播放的音乐信息
+        self.download_thread = None  # 下载线程实例
+        self.is_playing = False      # 播放状态标记
+
+        # 过滤条件初始化
+        self.current_keyword = ""
+        self.current_category = "all"  # 默认显示全部
+        
+        # 分类按钮组（用于管理按钮选中状态）
+        self.category_buttons = {}
+        self.category_button_group = QButtonGroup(self)
+        self.category_button_group.setExclusive(True)  # 互斥选择
+
+        # 初始化 UI
+        self.init_ui()
+        # 加载音乐、标签、公告数据
+        self.load_data_in_background()
+        # 初始化播放进度定时器
+        self.init_playback_timer()
+
+    def init_ui(self):
+        """构建完整 UI 界面"""
+        central_widget = QWidget()
+        self.setCentralWidget(central_widget)
+        main_layout = QVBoxLayout(central_widget)
+
+        # 1. 菜单栏
+        self.create_menu_bar()
+
+        # 2. 顶部控制区（搜索+刷新）
+        top_control_layout = QHBoxLayout()
+        top_control_layout.setContentsMargins(10, 10, 10, 5)
+
+        # 搜索框
+        self.search_input = QLineEdit()
+        self.search_input.setPlaceholderText("搜索：标题/艺术家...")
+        self.search_input.setFixedHeight(30)
+        self.search_input.textChanged.connect(self.filter_music_by_search)
+        top_control_layout.addWidget(self.search_input, stretch=5)
+
+        # 刷新按钮
+        self.refresh_btn = QPushButton("刷新列表")
+        self.refresh_btn.setFixedHeight(30)
+        self.refresh_btn.setFixedWidth(100)
+        self.refresh_btn.clicked.connect(self.load_data_in_background)
+        top_control_layout.addWidget(self.refresh_btn, stretch=0)
+
+        main_layout.addLayout(top_control_layout)
+
+        # 3. 中部主内容区（分割窗口：左侧分类+列表 + 右侧播放器）
+        main_splitter = QSplitter(Qt.Horizontal)
+        main_splitter.setContentsMargins(10, 5, 10, 10)
+
+        # 左侧区域（分类+列表）
+        left_widget = QWidget()
+        left_layout = QVBoxLayout(left_widget)
+        
+        # 3.1 分类区域（垂直布局的按钮）
+        self.category_container = QWidget()
+        self.category_layout = QVBoxLayout(self.category_container)
+        self.category_layout.setSpacing(5)  # 按钮之间的间距
+        self.category_layout.setContentsMargins(0, 0, 0, 0)
+        self.category_container.setFixedHeight(200)  # 容纳垂直排列的按钮
+        left_layout.addWidget(self.category_container)
+        
+        # 初始化分类按钮（垂直排列）
+        self.init_categories()
+        
+        # 3.2 音乐列表
+        self.music_tree = QTreeWidget()
+        self.music_tree.setColumnCount(4)
+        self.music_tree.setHeaderLabels(["标题", "艺术家", "分类", "时长"])
+        # 设置列宽
+        self.music_tree.setColumnWidth(0, 300)  # 标题列
+        self.music_tree.setColumnWidth(1, 180)  # 艺术家列
+        self.music_tree.setColumnWidth(2, 100)  # 分类列
+        self.music_tree.setColumnWidth(3, 80)   # 时长列
+        # 单选模式 + 双击播放
+        self.music_tree.setSelectionMode(QTreeWidget.SingleSelection)
+        self.music_tree.itemDoubleClicked.connect(self.on_music_double_click)
+        left_layout.addWidget(self.music_tree)
+        
+        main_splitter.addWidget(left_widget)
+
+        # 右侧区域：标签页（播放器 + 公告）
+        self.right_tab = QTabWidget()
+        self.right_tab.setMinimumWidth(500)
+
+        # 右侧1：播放器面板
+        self.player_panel = QWidget()
+        self.init_player_panel()  # 初始化播放控制UI
+        self.right_tab.addTab(self.player_panel, "音乐播放器")
+
+        # 右侧2：公告面板 - 以HTML格式显示内容
+        self.announcement_panel = QTextEdit()
+        self.announcement_panel.setReadOnly(True)
+        self.announcement_panel.setStyleSheet("font-size: 14px; padding: 10px;")
+        # 设置为HTML格式显示模式
+        self.announcement_panel.setAcceptRichText(True)
+        self.announcement_panel.document().setHtml("加载中...")
+        self.right_tab.addTab(self.announcement_panel, "最新公告")
+
+        main_splitter.addWidget(self.right_tab)
+        main_splitter.setSizes([600, 600])  # 左右窗口比例
+        main_layout.addWidget(main_splitter, stretch=1)
+
+        # 4. 底部状态栏
+        self.status_bar = self.statusBar()
+        self.status_bar.showMessage("就绪：未播放音乐")
+
+    def create_menu_bar(self):
+        """创建菜单栏（文件+帮助）"""
+        menubar = self.menuBar()
+
+        # 文件菜单
+        file_menu = menubar.addMenu("文件")
+        exit_action = QAction("退出", self)
+        exit_action.setShortcut("Ctrl+Q")
+        exit_action.triggered.connect(self.close)
+        file_menu.addAction(exit_action)
+
+        # 帮助菜单
+        help_menu = menubar.addMenu("帮助")
+        about_action = QAction("关于", self)
+        about_action.triggered.connect(self.show_about_dialog)
+        help_menu.addAction(about_action)
+
+    def init_categories(self):
+        """初始化分类为垂直排列的按钮，每个按钮单独一行"""
+        # 清除现有按钮
+        for btn in self.category_buttons.values():
+            self.category_button_group.removeButton(btn)
+            btn.deleteLater()
+        self.category_buttons.clear()
+        
+        for category, config in CATEGORY_CONFIG.items():
+            # 创建按钮
+            btn = QPushButton(config['name'])
+            btn.setMinimumHeight(30)  # 按钮高度
+            btn.setCheckable(True)    # 可选中
+            btn.setStyleSheet(f"""
+                QPushButton {{
+                    background-color: {config['color']};
+                    color: {config['text_color']};
+                    border-radius: 4px;
+                    font-weight: bold;
+                    padding: 5px;
+                    text-align: center;
+                }}
+                QPushButton:checked {{
+                    border: 2px solid #3498db;  /* 选中状态边框 */
+                }}
+                QPushButton:hover {{
+                    opacity: 0.9;  /* 鼠标悬停效果 */
+                }}
+            """)
+            
+            # 存储分类标识
+            btn.setProperty("category", category)
+            
+            # 连接点击事件
+            btn.clicked.connect(self.on_category_button_clicked)
+            
+            # 添加到布局和按钮组
+            self.category_layout.addWidget(btn)
+            self.category_button_group.addButton(btn)
+            self.category_buttons[category] = btn
+        
+        # 默认选中"全部音乐"
+        if 'all' in self.category_buttons:
+            self.category_buttons['all'].setChecked(True)
+
+    def on_category_button_clicked(self):
+        """处理分类按钮点击事件"""
+        # 获取点击的按钮
+        btn = self.sender()
+        if btn:
+            # 获取分类标识
+            self.current_category = btn.property("category")
+            self.apply_music_filters()
+
+    def init_player_panel(self):
+        """初始化播放器面板"""
+        panel_layout = QVBoxLayout(self.player_panel)
+        panel_layout.setContentsMargins(20, 20, 20, 20)
+
+        # 1. 当前播放音乐信息
+        self.music_info_label = QLabel("当前未播放音乐")
+        self.music_info_label.setAlignment(Qt.AlignCenter)
+        self.music_info_label.setStyleSheet("""
+            font-size: 16px; 
+            font-weight: bold; 
+            color: #2c3e50; 
+            margin-bottom: 20px;
+            padding: 10px;
+            border-radius: 5px;
+            background-color: #f5f5f5;
+        """)
+        panel_layout.addWidget(self.music_info_label)
+
+        # 2. 播放进度条
+        self.play_progress = QSlider(Qt.Horizontal)
+        self.play_progress.setRange(0, 100)
+        self.play_progress.setValue(0)
+        self.play_progress.setDisabled(True)
+        self.play_progress.sliderReleased.connect(self.seek_playback)
+        panel_layout.addWidget(self.play_progress)
+
+        # 3. 时间显示（已播放/总时长）
+        time_layout = QHBoxLayout()
+        self.current_time_label = QLabel("00:00")
+        self.total_time_label = QLabel("00:00")
+        time_layout.addWidget(self.current_time_label)
+        time_layout.addStretch(1)
+        time_layout.addWidget(self.total_time_label)
+        panel_layout.addLayout(time_layout)
+
+        # 4. 播放控制按钮
+        control_layout = QHBoxLayout()
+        control_layout.setAlignment(Qt.AlignCenter)
+
+        self.prev_btn = QPushButton("上一曲")
+        self.prev_btn.setFixedSize(80, 40)
+        self.prev_btn.setDisabled(True)
+        self.prev_btn.clicked.connect(self.play_previous)
+        control_layout.addWidget(self.prev_btn)
+
+        self.play_pause_btn = QPushButton("播放")
+        self.play_pause_btn.setFixedSize(100, 40)
+        self.play_pause_btn.setDisabled(True)
+        self.play_pause_btn.clicked.connect(self.toggle_play_pause)
+        control_layout.addWidget(self.play_pause_btn)
+
+        self.next_btn = QPushButton("下一曲")
+        self.next_btn.setFixedSize(80, 40)
+        self.next_btn.setDisabled(True)
+        self.next_btn.clicked.connect(self.play_next)
+        control_layout.addWidget(self.next_btn)
+
+        panel_layout.addLayout(control_layout)
+
+    def init_playback_timer(self):
+        """初始化播放进度定时器"""
+        self.playback_timer = QTimer(self)
+        self.playback_timer.setInterval(1000)  # 1秒=1000毫秒
+        self.playback_timer.timeout.connect(self.update_playback_progress)
+
+    def show_about_dialog(self):
+        """显示关于对话框"""
+        QMessageBox.about(
+            self, "关于落日音乐",
+            "落日音乐 for PC\n\n"
+            "版本：1.0.0\n"
+            "核心功能：\n"
+            "- 音乐分类与搜索\n"
+            "- 本地音频缓存\n"
+            "- 完整播放控制\n"
+            "- 支持HTML格式公告显示"
+        )
+
+    # --- 数据加载相关函数 ---
+    def load_data_in_background(self):
+        """后台加载音乐、标签、公告数据"""
+        self.status_bar.showMessage("正在加载数据...")
+        self.set_widgets_enabled(False)  # 禁用UI控件
+
+        # 启动数据加载线程
+        self.data_thread = QThread()
+        self.data_worker = DataLoadWorker()
+        self.data_worker.moveToThread(self.data_thread)
+
+        # 连接线程信号
+        self.data_thread.started.connect(self.data_worker.run)
+        self.data_worker.music_loaded.connect(self.on_music_data_loaded)
+        self.data_worker.tags_loaded.connect(self.on_tags_data_loaded)
+        self.data_worker.announcements_loaded.connect(self.on_announcements_loaded)
+        self.data_worker.finished.connect(self.data_thread.quit)
+        self.data_worker.finished.connect(lambda: self.set_widgets_enabled(True))
+        self.data_worker.finished.connect(lambda: self.status_bar.showMessage("数据加载完成"))
+
+        self.data_thread.start()
+
+    def set_widgets_enabled(self, enabled):
+        """设置核心UI控件是否可用"""
+        self.search_input.setEnabled(enabled)
+        self.refresh_btn.setEnabled(enabled)
+        self.music_tree.setEnabled(enabled)
+        for btn in self.category_buttons.values():
+            btn.setEnabled(enabled)
+
+    def on_music_data_loaded(self, music_data):
+        """音乐数据加载完成后的处理"""
+        if not music_data or not music_data.get("success", False):
+            QMessageBox.warning(self, "警告", "音乐数据加载失败！")
+            return
+
+        self.all_music = music_data["data"]
+        self.filtered_music = self.all_music.copy()
+        self.populate_music_tree()  # 填充音乐列表
+        self.status_bar.showMessage(f"加载完成：共 {len(self.all_music)} 首音乐")
+
+    def on_tags_data_loaded(self, tags_data):
+        """标签数据加载完成后的处理（预留）"""
+        pass  # 分类系统已由CATEGORY_CONFIG定义
+
+    def on_announcements_loaded(self, announcements_data):
+        """公告数据加载完成后，以HTML格式显示内容"""
+        # 确保公告面板使用HTML格式
+        self.announcement_panel.setAcceptRichText(True)
+        
+        if not announcements_data or not announcements_data.get("success", False):
+            self.announcement_panel.setHtml("<p>公告加载失败或暂无公告</p>")
+            return
+
+        # 构建HTML内容
+        html_content = "<html><body>"
+        html_content += "<h2 style='color: #2c3e50; border-bottom: 1px solid #eee; padding-bottom: 10px;'>最新公告</h2>"
+        
+        announcements = announcements_data["data"]
+        for i, ann in enumerate(announcements):
+            time_str = ann.get("time", "未知时间")
+            content = ann.get("nr", "无公告内容")
+            
+            # 将公告内容作为HTML处理
+            html_content += f"""
+            <div style='margin-bottom: 20px; padding: 10px; {'background-color: #f9f9f9;' if i % 2 == 0 else ''}'>
+                <p style='color: #7f8c8d; font-size: 12px; margin: 0 0 10px 0;'>{time_str}</p>
+                <div style='color: #34495e;'>{content}</div>
+            </div>
+            """
+        
+        html_content += "</body></html>"
+        
+        # 设置HTML内容到公告面板
+        self.announcement_panel.setHtml(html_content)
+
+    def populate_music_tree(self):
+        """将音乐数据填充到 TreeWidget 列表中"""
+        self.music_tree.clear()
+        for idx, music in enumerate(self.filtered_music):
+            # 获取分类配置
+            category = music.get("category", "other")
+            cat_config = CATEGORY_CONFIG.get(category, CATEGORY_CONFIG["other"])
+            
+            # 格式化时长
+            duration = music.get("duration", "")
+            try:
+                duration_sec = int(duration)
+                duration_str = f"{duration_sec//60:02d}:{duration_sec%60:02d}"
+            except:
+                duration_str = "未知"
+
+            # 创建列表项
+            item = QTreeWidgetItem([
+                music.get("title", "未知标题"),
+                music.get("artist", "未知艺术家"),
+                cat_config["name"],  # 使用美化后的分类名称
+                duration_str
+            ])
+            
+            # 设置分类列的颜色
+            item.setBackground(2, QBrush(QColor(cat_config["color"])))
+            item.setForeground(2, QBrush(QColor(cat_config["text_color"])))
+            
+            # 存储完整音乐信息
+            item.setData(0, Qt.UserRole, music)
+            # 交替行颜色
+            if idx % 2 == 0:
+                for col in [0, 1, 3]:
+                    item.setBackground(col, QBrush(QColor(245, 245, 245)))
+
+            self.music_tree.addTopLevelItem(item)
+
+    # --- 音乐筛选相关函数 ---
+    def filter_music_by_search(self):
+        """根据搜索关键词筛选音乐"""
+        self.current_keyword = self.search_input.text().lower()
+        self.apply_music_filters()
+
+    def apply_music_filters(self):
+        """应用筛选条件（关键词+分类）"""
+        self.filtered_music = []
+        for music in self.all_music:
+            # 分类筛选
+            category_match = True
+            if self.current_category != "all":
+                category_match = (music.get("category", "") == self.current_category)
+            
+            # 关键词筛选
+            keyword_match = True
+            if self.current_keyword:
+                keyword = self.current_keyword
+                title = music.get("title", "").lower()
+                artist = music.get("artist", "").lower()
+                keyword_match = (keyword in title) or (keyword in artist)
+            
+            # 同时满足才加入筛选结果
+            if category_match and keyword_match:
+                self.filtered_music.append(music)
+        
+        self.populate_music_tree()
+        self.highlight_search_keyword()
+
+    def highlight_search_keyword(self):
+        """高亮音乐列表中的搜索关键词"""
+        if not self.current_keyword:
+            return
+
+        # 遍历所有列表项，匹配关键词并高亮
+        for idx in range(self.music_tree.topLevelItemCount()):
+            item = self.music_tree.topLevelItem(idx)
+            for col in range(2):  # 只高亮标题和艺术家列
+                text = item.text(col).lower()
+                if self.current_keyword in text:
+                    item.setBackground(col, QBrush(QColor(255, 255, 153)))  # 浅黄色高亮
+                else:
+                    # 恢复交替行颜色
+                    if idx % 2 == 0:
+                        item.setBackground(col, QBrush(QColor(245, 245, 245)))
+                    else:
+                        item.setBackground(col, QBrush(QColor(255, 255, 255)))
+
+    # --- 音乐播放相关函数 ---
+    def on_music_double_click(self, item, column):
+        """双击音乐列表项：下载并播放"""
+        # 获取当前选中的音乐信息
+        music = item.data(0, Qt.UserRole)
+        if not music:
+            return
+
+        # 1. 停止当前播放和下载（如果有）
+        self.stop_playback()
+        if self.download_thread and self.download_thread.isRunning():
+            self.download_thread.cancel()
+            self.download_thread.wait()
+
+        # 2. 记录当前播放的音乐信息
+        self.current_playing_music = music
+        music_id = music.get("id")
+        music_title = music.get("title", "未知音乐")
+        music_artist = music.get("artist", "未知艺术家")
+        music_category = music.get("category", "other")
+        
+        # 获取分类名称
+        cat_name = CATEGORY_CONFIG.get(music_category, CATEGORY_CONFIG["other"])["name"]
+
+        # 3. 更新UI显示
+        self.music_info_label.setText(f"{music_title} - {music_artist}\n【{cat_name}】")
+        self.status_bar.showMessage(f"准备下载：{music_title}")
+
+        # 4. 创建下载进度对话框
+        self.download_dialog = QProgressDialog(f"正在下载 {music_title}...", "取消", 0, 100, self)
+        self.download_dialog.setWindowTitle("下载中")
+        self.download_dialog.setWindowModality(Qt.WindowModal)
+        self.download_dialog.canceled.connect(self.cancel_download)
+
+        # 5. 启动下载线程
+        self.download_thread = DownloadThread(music_id, music_title, music_artist)
+        # 连接信号
+        self.download_thread.progress_updated.connect(self.download_dialog.setValue)
+        self.download_thread.download_complete.connect(self.on_download_complete)
+        self.download_thread.error_occurred.connect(self.on_download_error)
+        # 启动线程
+        self.download_thread.start()
+
+    def cancel_download(self):
+        """取消下载"""
+        if self.download_thread and self.download_thread.isRunning():
+            self.download_thread.cancel()
+            self.status_bar.showMessage("下载已取消")
+
+    def on_download_complete(self, file_path):
+        """下载完成后播放音乐"""
+        if hasattr(self, 'download_dialog'):
+            self.download_dialog.close()
+        
+        if not os.path.exists(file_path):
+            self.on_playback_error("下载文件不存在")
+            return
+
+        # 开始播放
+        self.current_playing_file = file_path
+        self.start_playback()
+
+    def on_download_error(self, error_msg):
+        """下载错误处理"""
+        if hasattr(self, 'download_dialog'):
+            self.download_dialog.close()
+        
+        self.on_playback_error(error_msg)
+
+    def start_playback(self):
+        """开始播放音频"""
+        if not self.current_playing_file or not os.path.exists(self.current_playing_file):
+            self.on_playback_error("播放文件不存在")
+            return
+
+        try:
+            # 加载并播放音频
+            pygame.mixer.music.load(self.current_playing_file)
+            pygame.mixer.music.play()
+            self.is_playing = True
+
+            # 更新UI状态
+            self.play_pause_btn.setText("暂停")
+            self.play_pause_btn.setEnabled(True)
+            self.prev_btn.setEnabled(len(self.filtered_music) > 1)
+            self.next_btn.setEnabled(len(self.filtered_music) > 1)
+            self.play_progress.setDisabled(False)
+
+            # 获取并显示总时长
+            total_duration = pygame.mixer.Sound(self.current_playing_file).get_length()  # 秒
+            self.total_duration = total_duration
+            self.total_time_label.setText(self.format_time(total_duration))
+
+            # 启动播放进度定时器
+            self.playback_timer.start()
+            self.status_bar.showMessage(
+                f"正在播放：{self.current_playing_music['title']}"
+            )
+
+        except Exception as e:
+            self.on_playback_error(f"播放失败：{str(e)}")
+
+    def on_playback_error(self, error_msg):
+        """播放错误的处理"""
+        # 重置UI
+        self.play_progress.setDisabled(True)
+        self.play_pause_btn.setText("播放")
+        self.play_pause_btn.setEnabled(False)
+        self.prev_btn.setEnabled(False)
+        self.next_btn.setEnabled(False)
+        
+        # 更新状态信息
+        self.music_info_label.setText(f"播放失败：{error_msg}")
+        self.status_bar.showMessage(f"错误：{error_msg}")
+
+        # 弹出错误提示
+        QMessageBox.warning(self, "播放错误", error_msg)
+
+    def toggle_play_pause(self):
+        """切换播放/暂停状态"""
+        if not self.current_playing_file:
+            return
+
+        if self.is_playing:
+            pygame.mixer.music.pause()
+            self.is_playing = False
+            self.play_pause_btn.setText("播放")
+            self.playback_timer.stop()
+            if self.current_playing_music:
+                self.status_bar.showMessage(
+                    f"已暂停：{self.current_playing_music['title']}"
+                )
+        else:
+            pygame.mixer.music.unpause()
+            self.is_playing = True
+            self.play_pause_btn.setText("暂停")
+            self.playback_timer.start()
+            if self.current_playing_music:
+                self.status_bar.showMessage(
+                    f"继续播放：{self.current_playing_music['title']}"
+                )
+
+    def stop_playback(self):
+        """停止当前播放"""
+        if pygame.mixer.music.get_busy() or self.is_playing:
+            pygame.mixer.music.stop()
+            self.is_playing = False
+
+        # 重置UI
+        self.playback_timer.stop()
+        self.play_progress.setValue(0)
+        self.current_time_label.setText("00:00")
+        self.total_time_label.setText("00:00")
+        self.play_pause_btn.setText("播放")
+        self.play_pause_btn.setEnabled(False)
+        self.prev_btn.setEnabled(False)
+        self.next_btn.setEnabled(False)
+
+        self.current_playing_file = ""
+
+    def update_playback_progress(self):
+        """更新播放进度条和时间显示"""
+        if not self.current_playing_file or not self.is_playing:
+            return
+
+        # 获取当前播放位置（秒）
+        current_pos = pygame.mixer.music.get_pos() / 1000  # 毫秒转秒
+        # 计算进度百分比
+        progress = int((current_pos / self.total_duration) * 100)
+        progress = min(progress, 100)  # 避免超过100%
+
+        # 更新UI
+        self.play_progress.setValue(progress)
+        self.current_time_label.setText(self.format_time(current_pos))
+
+        # 检查是否播放完成
+        if current_pos >= self.total_duration - 0.5:  # 留出一点误差空间
+            self.play_next()  # 自动播放下一曲
+
+    def seek_playback(self):
+        """拖动进度条跳转播放位置"""
+        if not self.current_playing_file or not self.is_playing:
+            return
+
+        # 获取进度条百分比对应的播放位置（秒）
+        progress = self.play_progress.value()
+        target_pos = (progress / 100) * self.total_duration
+        # 跳转播放位置
+        pygame.mixer.music.set_pos(target_pos)
+        # 更新时间显示
+        self.current_time_label.setText(self.format_time(target_pos))
+
+    def play_previous(self):
+        """播放上一曲"""
+        if not self.current_playing_music or len(self.filtered_music) <= 1:
+            return
+
+        # 找到当前播放音乐在筛选列表中的索引
+        current_idx = -1
+        current_id = self.current_playing_music.get("id")
+        for idx, music in enumerate(self.filtered_music):
+            if str(music.get("id")) == str(current_id):
+                current_idx = idx
+                break
+
+        # 播放前一项（循环到最后一项如果当前是第一项）
+        if current_idx == 0:
+            target_idx = len(self.filtered_music) - 1
+        else:
+            target_idx = current_idx - 1
+
+        # 触发双击播放
+        target_item = self.music_tree.topLevelItem(target_idx)
+        self.on_music_double_click(target_item, 0)
+
+    def play_next(self):
+        """播放下一曲"""
+        if not self.current_playing_music or len(self.filtered_music) <= 1:
+            return
+
+        # 找到当前播放音乐在筛选列表中的索引
+        current_idx = -1
+        current_id = self.current_playing_music.get("id")
+        for idx, music in enumerate(self.filtered_music):
+            if str(music.get("id")) == str(current_id):
+                current_idx = idx
+                break
+
+        # 播放后一项（循环到第一项如果当前是最后一项）
+        if current_idx == len(self.filtered_music) - 1:
+            target_idx = 0
+        else:
+            target_idx = current_idx + 1
+
+        # 触发双击播放
+        target_item = self.music_tree.topLevelItem(target_idx)
+        self.on_music_double_click(target_item, 0)
+
+    @staticmethod
+    def format_time(seconds):
+        """将秒数格式化为 分:秒"""
+        minutes = int(seconds // 60)
+        secs = int(seconds % 60)
+        return f"{minutes:02d}:{secs:02d}"
+
+    def closeEvent(self, event):
+        """窗口关闭时的清理操作"""
+        # 停止播放
+        self.stop_playback()
+        # 停止下载线程
+        if hasattr(self, "download_thread") and self.download_thread.isRunning():
+            self.download_thread.cancel()
+            self.download_thread.wait()
+        # 退出 pygame
+        pygame.mixer.quit()
+        event.accept()
+
+# --- 程序入口 ---
+if __name__ == "__main__":
+    # 解决 PyQt5 中文显示问题
+    QApplication.setAttribute(Qt.AA_EnableHighDpiScaling)
+    app = QApplication(sys.argv)
+    
+    # 设置全局样式
+    app.setStyle("Fusion")
+    
+    # 启动应用
+    window = SunsetMusicApp()
+    window.show()
+    sys.exit(app.exec_())
+