refactor: restructure to core/ + ui/ with multi-threaded backend

ui/widgets/message_history.py

@@ -0,0 +1,57 @@
+"""消息历史组件"""
+
+from textual.containers import ScrollableContainer
+from textual.message import Message
+from .message_widget import MessageWidget
+from ..models.message import Message as MessageModel
+
+
+class MessageHistory(ScrollableContainer):
+    """消息历史区域"""
+
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        self._messages: list[MessageModel] = []
+
+    def compose(self):
+        """构建消息历史"""
+        for message in self._messages:
+            yield MessageWidget(message)
+
+    def add_message(self, message: MessageModel) -> None:
+        """添加新消息"""
+        self._messages.append(message)
+        # 添加新组件
+        message_widget = MessageWidget(message)
+        self.mount(message_widget)
+        # 滚动到最新消息
+        self.scroll_to_widget(message_widget, animate=False)
+
+    def update_latest_message(self, content: str) -> None:
+        """更新最新消息的内容"""
+        if self.children:
+            latest_widget = self.children[-1]
+            if isinstance(latest_widget, MessageWidget):
+                latest_widget.update_content(content)
+                # 确保滚动到最新消息
+                self.scroll_to_widget(latest_widget, animate=False)
+
+    def clear_messages(self) -> None:
+        """清空消息历史"""
+        self._messages.clear()
+        # 移除所有子组件
+        for child in self.children:
+            child.remove()
+
+    def get_latest_message(self) -> MessageModel | None:
+        """获取最新消息"""
+        if self._messages:
+            return self._messages[-1]
+        return None
+
+    def toggle_latest_tool_details(self) -> None:
+        """切换最新消息的工具详情"""
+        if self.children:
+            latest_widget = self.children[-1]
+            if isinstance(latest_widget, MessageWidget):
+                latest_widget.toggle_tool_details()