feat(gui): add two startup modes (new/open project)

src/gui.py

@@ -10,6 +10,7 @@ import os
 import threading
 import logging
 import configparser
+import yaml
 from pathlib import Path
 
 # 设置环境
@@ -63,16 +64,150 @@ class GUI(QMainWindow):
 
         self.signaller = Signaller()
         self.worker_thread = None
-        self._setup_ui()
+        self.pipeline = None  # 当前 Pipeline 实例
+        self.project_config = None  # 当前项目配置
 
         # 连接信号
         self.signaller.log_signal.connect(self._append_log)
         self.signaller.finished_signal.connect(self._on_finished)
 
-    def _setup_ui(self):
+        # 显示启动页
+        self._setup_start_page()
+
+    def _clear_ui(self):
+        """清空当前 UI"""
+        central = self.centralWidget()
+        if central:
+            central.deleteLater()
+
+    def _setup_start_page(self):
+        """启动页：新建项目 / 打开已有项目"""
         self.setWindowTitle("Piano Highlight Generator - GUI")
+        self.setGeometry(100, 100, 500, 300)
+
+        self._clear_ui()
+        central = QWidget()
+        self.setCentralWidget(central)
+        layout = QVBoxLayout(central)
+        layout.setAlignment(Qt.AlignCenter)
+
+        # 标题
+        title = QLabel("Piano Highlight Generator")
+        title.setStyleSheet("font-size: 24px; font-weight: bold;")
+        title.setAlignment(Qt.AlignCenter)
+        layout.addWidget(title)
+
+        layout.addSpacing(40)
+
+        # 按钮
+        self.new_project_btn = QPushButton("新建项目")
+        self.new_project_btn.setMinimumHeight(50)
+        self.new_project_btn.clicked.connect(self._on_new_project)
+        layout.addWidget(self.new_project_btn)
+
+        self.open_project_btn = QPushButton("打开已有项目")
+        self.open_project_btn.setMinimumHeight(50)
+        self.open_project_btn.clicked.connect(self._on_open_project)
+        layout.addWidget(self.open_project_btn)
+
+        layout.addStretch()
+
+    def _on_new_project(self):
+        """新建项目：切换到文件选择界面"""
+        self._setup_new_project_ui()
+
+    def _on_open_project(self):
+        """打开已有项目"""
+        dir_path = QFileDialog.getExistingDirectory(self, "选择项目目录")
+        if not dir_path:
+            return
+        self.load_project(dir_path)
+
+    def load_project(self, output_dir):
+        """
+        加载已有项目，加载 generated_config.yaml，显示 clip 列表
+        """
+        config_path = os.path.join(output_dir, 'generated_config.yaml')
+        if not os.path.exists(config_path):
+            QMessageBox.critical(self, "错误", f"不是有效的项目目录：\n{config_path}")
+            return
+
+        with open(config_path, 'r', encoding='utf-8') as f:
+            self.project_config = yaml.safe_load(f)
+
+        self.project_config['output_dir'] = output_dir
+
+        # 初始化 Pipeline
+        self.pipeline = Pipeline(self.project_config)
+
+        # 显示项目信息（Task 9 完成后替换为完整编辑界面）
+        self._show_project_info()
+
+    def _show_project_info(self):
+        """显示项目基本信息（临时，过渡用）"""
+        self.setWindowTitle("项目信息 - Piano Highlight Generator")
+        self.setGeometry(100, 100, 600, 400)
+
+        self._clear_ui()
+        central = QWidget()
+        self.setCentralWidget(central)
+        layout = QVBoxLayout(central)
+
+        # 项目路径
+        layout.addWidget(QLabel(f"<b>项目目录:</b> {self.project_config.get('output_dir', 'N/A')}"))
+
+        # 视频源
+        video_src = self.project_config.get('video_src', 'N/A')
+        layout.addWidget(QLabel(f"<b>视频:</b> {video_src}"))
+
+        # PPT 源
+        ppt_src = self.project_config.get('ppt_src', 'N/A')
+        layout.addWidget(QLabel(f"<b>PPT:</b> {ppt_src}"))
+
+        # Clips 数量
+        clips = self.project_config.get('clips', [])
+        layout.addWidget(QLabel(f"<b>Clips 数量:</b> {len(clips)}"))
+
+        # Clips 列表
+        if clips:
+            list_label = QLabel("<b>Clips 列表:</b>")
+            layout.addWidget(list_label)
+            for i, clip in enumerate(clips[:10]):  # 只显示前10个
+                title = clip.get('title', clip.get('content', 'N/A'))[:50]
+                start = clip.get('start_time', 'N/A')
+                end = clip.get('end_time', 'N/A')
+                layout.addWidget(QLabel(f"  {i+1}. [{start}-{end}] {title}"))
+            if len(clips) > 10:
+                layout.addWidget(QLabel(f"  ... 还有 {len(clips) - 10} 个"))
+
+        layout.addStretch()
+
+        # 按钮区
+        btn_layout = QHBoxLayout()
+        self.edit_btn = QPushButton("进入编辑模式")
+        self.edit_btn.clicked.connect(self._setup_edit_ui)  # Task 9 实现
+        back_btn = QPushButton("返回")
+        back_btn.clicked.connect(self._setup_start_page)
+        btn_layout.addWidget(self.edit_btn)
+        btn_layout.addWidget(back_btn)
+        layout.addLayout(btn_layout)
+
+    def _setup_edit_ui(self):
+        """
+        编辑界面（Task 9 实现）
+        目前显示 TODO 提示
+        """
+        QMessageBox.information(
+            self, "提示",
+            "编辑模式将在 Task 9 中实现\n目前可以手动编辑 generated_config.yaml 后重新运行"
+        )
+
+    def _setup_new_project_ui(self):
+        """新建项目的文件选择界面"""
+        self.setWindowTitle("新建项目 - Piano Highlight Generator")
         self.setGeometry(100, 100, 700, 500)
 
+        self._clear_ui()
         central = QWidget()
         self.setCentralWidget(central)
         layout = QVBoxLayout(central)
@@ -124,12 +259,11 @@ class GUI(QMainWindow):
         # === 按钮区 ===
         btn_layout = QHBoxLayout()
         self.start_btn = QPushButton("开始处理")
-        self.start_btn.clicked.connect(self._on_start)
-        self.clear_btn = QPushButton("清空日志")
-        self.clear_btn.clicked.connect(lambda: self.log_area.clear())
+        self.start_btn.clicked.connect(self._on_start_new)
+        self.back_btn = QPushButton("返回")
+        self.back_btn.clicked.connect(self._setup_start_page)
         btn_layout.addWidget(self.start_btn)
-        btn_layout.addWidget(self.clear_btn)
-        btn_layout.addStretch()
+        btn_layout.addWidget(self.back_btn)
         layout.addLayout(btn_layout)
 
     def _select_file(self, edit, filter_str):
@@ -156,8 +290,8 @@ class GUI(QMainWindow):
         else:
             QMessageBox.critical(self, "错误", message)
 
-    def _on_start(self):
-        # 收集参数
+    def _on_start_new(self):
+        """开始新建项目流程"""
         video_path = self.video_edit.text().strip()
         ppt_path = self.ppt_edit.text().strip()
         output_dir = self.output_edit.text().strip()
@@ -182,12 +316,13 @@ class GUI(QMainWindow):
 
         # 后台线程执行
         self.worker_thread = threading.Thread(
-            target=self._worker,
+            target=self._worker_new,
             args=(video_path, ppt_path, output_dir, api_key, api_host)
         )
         self.worker_thread.start()
 
-    def _worker(self, video_path, ppt_path, output_dir, api_key, api_host):
+    def _worker_new(self, video_path, ppt_path, output_dir, api_key, api_host):
+        """新建项目的工作线程"""
         try:
             os.makedirs(output_dir, exist_ok=True)
 
@@ -217,7 +352,6 @@ class GUI(QMainWindow):
 
             # 保存配置
             config_path = os.path.join(output_dir, 'generated_config.yaml')
-            import yaml
             with open(config_path, 'w', encoding='utf-8') as f:
                 yaml.dump(config, f, allow_unicode=True, default_flow_style=False)
             self.signaller.log_signal.emit(f"配置已保存: {config_path}")