feat: 懒加载面板Catch-up状态回放 + 上一步/下一步向导导航按钮

src/gui/core/panel_factory.py

@@ -20,6 +20,7 @@ from PyQt5.QtCore import Qt
 
 from src.gui.core.panel_registry import PANEL_REGISTRY
 from src.gui.core.dependency_subscriber import subscribe_panel_to_dependencies
+from src.gui.core.event_bus import global_event_bus
 
 
 class PanelFactory:
@@ -184,6 +185,90 @@ class PanelFactory:
         if deps:
             subscribe_panel_to_dependencies(panel, step_id, deps)
 
+        # ★ Catch-up：向刚苏醒的懒加载面板回放已累积的状态
+        #   （面板在 OutputUpdated 事件广播之后才实例化，错过了事件，
+        #     必须主动回放 step_outputs + 全局输入，否则输入框全空）
+        self._replay_state_to_panel(panel)
+
+    # ── Catch-up 状态追溯 ────────────────────────────────────
+
+    def _replay_state_to_panel(self, panel):
+        """向刚实例化的懒加载面板回放已累积的状态。
+
+        三步回放：
+        1. update_from_config —— 生成默认输出路径 + 跨面板参数读取
+        2. 回放 WorkspaceManager.step_outputs —— 已运行步骤的产出文件路径
+        3. 实时扫描已加载面板 —— 读取被依赖的属性值（如 Step1 的 img_file）
+           发布为 OutputUpdated，触发 dependency_subscriber 回填输入框
+        """
+        # 1. update_from_config：生成默认输出路径
+        if hasattr(panel, 'update_from_config'):
+            try:
+                work_dir = self._get_current_work_dir()
+                panel.update_from_config(work_dir=work_dir, pipeline=None)
+            except Exception:
+                pass
+
+        # 2. 回放 WorkspaceManager 中已累积的 step_outputs
+        ws_manager = self._get_workspace_manager()
+        if ws_manager:
+            for src_step_id, outputs in ws_manager.step_outputs.items():
+                for output_type, path in outputs.items():
+                    if not path:
+                        continue
+                    global_event_bus.publish('OutputUpdated', {
+                        'step_id': src_step_id,
+                        'output_type': output_type,
+                        'path': path,
+                    })
+
+        # 3. 实时扫描已加载面板中被依赖的属性（覆盖全局输入如 reference_img）
+        self._replay_live_panel_inputs()
+
+    def _replay_live_panel_inputs(self):
+        """遍历 PANEL_REGISTRY 依赖声明，从已加载面板实时读取属性值。
+
+        若源面板已实例化，读取其 widget 的当前值并发布为 OutputUpdated，
+        确保懒加载面板能收到全局输入（如 Step1.img_file → reference_img）。
+        """
+        for entry in self._registry:
+            deps = entry.get('dependencies')
+            if not deps:
+                continue
+            for _input_field, (dep_step, output_type, panel_attr) in deps.items():
+                src_panel = self._panels.get(dep_step)
+                if src_panel is None:
+                    continue
+                widget = getattr(src_panel, panel_attr, None)
+                if widget is None:
+                    continue
+                path = ''
+                if hasattr(widget, 'get_path'):
+                    path = widget.get_path().strip()
+                elif hasattr(widget, 'text'):
+                    path = widget.text().strip()
+                if not path:
+                    continue
+                global_event_bus.publish('OutputUpdated', {
+                    'step_id': dep_step,
+                    'output_type': output_type,
+                    'path': path,
+                })
+
+    def _get_current_work_dir(self):
+        """从 WorkspaceInitializer 获取当前工作目录。"""
+        try:
+            return self._main_window._workspace_initializer.work_dir
+        except Exception:
+            return None
+
+    def _get_workspace_manager(self):
+        """从 WorkspaceInitializer 获取 WorkspaceManager 实例。"""
+        try:
+            return self._main_window._workspace_initializer.workspace_manager
+        except Exception:
+            return None
+
     def _preload_neighbors(self, index):
         """预加载当前 tab 的邻居（根据 preload_window 配置）。"""
         if self._preload_window < 0:

src/gui/water_quality_gui_v2.py

@@ -88,8 +88,6 @@ class WaterQualityGUI(QMainWindow):
         ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID(my_appid)
         super().__init__()
 
-        self._is_syncing = False
-
         icon_path = get_resource_path("data/icons-1/uitubiao.ico")
         self.setWindowIcon(QIcon(icon_path))
 
@@ -282,6 +280,7 @@ class WaterQualityGUI(QMainWindow):
         self.addToolBar(Qt.TopToolBarArea, banner_toolbar)
 
     def _create_central_layout(self):
+        from src.gui.styles import ModernStylesheet
         central_widget = QWidget()
         main_layout = QHBoxLayout()
         main_layout.setContentsMargins(0, 0, 0, 0)
@@ -295,9 +294,27 @@ class WaterQualityGUI(QMainWindow):
         right_layout.setSpacing(10)
 
         self._tab_widget = self._panel_factory.create_tab_widget(icons_dir="data/icons")
-        self._tab_widget.currentChanged.connect(self._on_tab_changed)
+        self._tab_widget.tabBar().setVisible(False)
         right_layout.addWidget(self._tab_widget, 3)
 
+        # 上一步 / 下一步 导航按钮
+        nav_btn_layout = QHBoxLayout()
+        nav_btn_layout.setSpacing(10)
+        self._prev_btn = QPushButton("< 上一步")
+        self._prev_btn.setMinimumHeight(32)
+        self._prev_btn.setStyleSheet(ModernStylesheet.get_button_stylesheet('default'))
+        self._prev_btn.clicked.connect(self._on_prev_clicked)
+        nav_btn_layout.addWidget(self._prev_btn)
+
+        self._next_btn = QPushButton("下一步 >")
+        self._next_btn.setMinimumHeight(32)
+        self._next_btn.setStyleSheet(ModernStylesheet.get_button_stylesheet('default'))
+        self._next_btn.clicked.connect(self._on_next_clicked)
+        nav_btn_layout.addWidget(self._next_btn)
+
+        nav_btn_layout.addStretch()
+        right_layout.addLayout(nav_btn_layout)
+
         right_layout.addWidget(self._log_manager.create_log_panel(), 1)
 
         right_widget.setLayout(right_layout)
@@ -419,6 +436,15 @@ class WaterQualityGUI(QMainWindow):
         work_dir = data.get('work_dir', '')
         self.statusBar().showMessage(f"工作目录: {work_dir}")
 
+        # 遍历已加载面板，调用 update_from_config 重建内存级参数和默认输出路径
+        for step_id, panel in self._panel_factory.get_loaded_panels().items():
+            if not hasattr(panel, 'update_from_config'):
+                continue
+            try:
+                panel.update_from_config(work_dir=work_dir, pipeline=None)
+            except Exception:
+                pass
+
     def _on_run_all_clicked(self):
         print("==== 按钮确实被按下了 ====", flush=True)
         try:
@@ -428,12 +454,11 @@ class WaterQualityGUI(QMainWindow):
             traceback.print_exc()
 
     # ================================================================
-    # 导航 ↔ Tab 双向同步（纯 UI 路由）
+    # 导航 → Tab 单向路由（左侧 List 驱动右侧 Tab，Tab 头部已隐藏）
     # ================================================================
 
     def _on_step_list_changed(self, index):
-        if self._is_syncing:
+        """左侧导航 → 右侧 Tab 单向路由（Tab 头部已隐藏，无反向同步）。"""
-            return
         if index < 0:
             return
         item = self._step_list.item(index)
@@ -446,36 +471,47 @@ class WaterQualityGUI(QMainWindow):
         tab_index = get_tab_index(item_data)
         if tab_index < 0:
             return
-        self._is_syncing = True
+        # 先触发懒加载再切 Tab，避免 removeTab/insertTab 与导航事件重叠
-        try:
-            # ★ 先触发懒加载：get_panel 内部 _ensure_loaded 自带 blockSignals
-            #    保护 removeTab/insertTab，面板实例化完成后再切 Tab，
-            #    此时 _ensure_loaded 发现已加载直接返回，不再触发索引偏移
         self._panel_factory.get_panel(item_data)
         self._tab_widget.setCurrentIndex(tab_index)
-        finally:
-            self._is_syncing = False
 
-    def _on_tab_changed(self, index):
+        # 动态更新上一步/下一步按钮可用状态
-        if self._is_syncing:
+        self._prev_btn.setEnabled(self._find_prev_step_row(index) is not None)
-            return
+        self._next_btn.setEnabled(self._find_next_step_row(index) is not None)
-        if index < 0:
+
-            return
+    def _find_prev_step_row(self, current_row):
-        from src.gui.core.panel_registry import get_step_id_by_tab_index
+        """从 current_row 向上遍历，跳过 stage_header 和空分隔符，返回上一个有效 step 的行号。"""
-        target_step_id = get_step_id_by_tab_index(index)
+        for i in range(current_row - 1, -1, -1):
-        if target_step_id is None:
+            item = self._step_list.item(i)
-            return
-        for row in range(self._step_list.count()):
-            item = self._step_list.item(row)
             if not item:
                 continue
-            if item.data(Qt.UserRole) == target_step_id:
+            data = item.data(Qt.UserRole)
-                self._is_syncing = True
+            if data and data != "stage_header":
-                try:
+                return i
+        return None
+
+    def _find_next_step_row(self, current_row):
+        """从 current_row 向下遍历，跳过 stage_header 和空分隔符，返回下一个有效 step 的行号。"""
+        for i in range(current_row + 1, self._step_list.count()):
+            item = self._step_list.item(i)
+            if not item:
+                continue
+            data = item.data(Qt.UserRole)
+            if data and data != "stage_header":
+                return i
+        return None
+
+    def _on_prev_clicked(self):
+        """上一步按钮：跳转到上一个有效步骤。"""
+        row = self._find_prev_step_row(self._step_list.currentRow())
+        if row is not None:
+            self._step_list.setCurrentRow(row)
+
+    def _on_next_clicked(self):
+        """下一步按钮：跳转到下一个有效步骤。"""
+        row = self._find_next_step_row(self._step_list.currentRow())
+        if row is not None:
             self._step_list.setCurrentRow(row)
-                finally:
-                    self._is_syncing = False
-                break
 
     # ================================================================
     # 横幅自适应