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

ui/widgets/message_widget.py

@@ -0,0 +1,108 @@
+"""消息组件"""
+
+from textual.containers import Container, Vertical
+from textual.widgets import Static
+from textual.message import Message
+from textual.css.query import NoMatches
+from ..models.message import Message as MessageModel
+
+
+class MessageWidget(Container):
+    """单条消息组件"""
+
+    def __init__(self, message: MessageModel, **kwargs):
+        super().__init__(**kwargs)
+        self._message = message
+        self._show_tool_details = False
+        self._content_widget = None  # 保存内容组件的引用
+        self._tool_details_container = None  # 保存工具详情容器引用
+
+    def compose(self):
+        """构建消息组件"""
+        # 消息头
+        role_emoji = "🟠" if self._message.role == "user" else "🔵"
+        timestamp_str = self._message.timestamp.strftime("%H:%M:%S")
+        yield Static(
+            f"{role_emoji}  {timestamp_str}",
+            classes="message-header"
+        )
+
+        # 消息内容 - 保存引用以便后续更新
+        self._content_widget = Static(
+            self._message.content,
+            classes="message-content"
+        )
+        yield self._content_widget
+
+        # 工具调用指示器
+        if self._message.tool_calls:
+            tool_count = len(self._message.tool_calls)
+            toggle_hint = "(F3折叠)" if self._show_tool_details else "(F3展开)"
+            yield Static(
+                f"[工具:{tool_count}次] {toggle_hint}",
+                classes="tool-indicator"
+            )
+
+            # 工具调用详情容器 - 始终创建，但根据状态显示/隐藏
+            self._tool_details_container = Vertical(classes="tool-details")
+            with self._tool_details_container:
+                for i, tool_call in enumerate(self._message.tool_calls, 1):
+                    yield Static(
+                        f"工具 {i}: {tool_call.name}",
+                        classes="tool-name"
+                    )
+                    yield Static(
+                        f"参数: {tool_call.arguments}",
+                        classes="tool-args"
+                    )
+
+                    # 显示执行结果
+                    if self._message.tool_results:
+                        for result in self._message.tool_results:
+                            if result.tool_call_id == tool_call.id:
+                                # 显示完整结果，不截断
+                                result_text = result.result
+                                # 如果结果太长，只显示前1000字符，但提供完整信息
+                                if len(result_text) > 1000:
+                                    result_text = result_text[:1000] + f"\n... (共{len(result.result)}字符，按F3查看完整内容)"
+                                yield Static(
+                                    f"结果: {result_text}",
+                                    classes="tool-result"
+                                )
+            
+            # 根据状态设置初始显示/隐藏
+            if not self._show_tool_details:
+                self._tool_details_container.styles.display = "none"
+
+    def update_content(self, new_content: str) -> None:
+        """更新消息内容"""
+        self._message.content = new_content
+        if self._content_widget:
+            self._content_widget.update(new_content)
+
+    def toggle_tool_details(self) -> None:
+        """切换工具详情显示状态"""
+        if self._message.tool_calls and self._tool_details_container:
+            self._show_tool_details = not self._show_tool_details
+            
+            # 切换显示/隐藏
+            if self._show_tool_details:
+                self._tool_details_container.styles.display = "block"
+            else:
+                self._tool_details_container.styles.display = "none"
+            
+            # 更新指示器文字
+            self._update_indicator()
+            
+            # 刷新布局
+            self.refresh(layout=True)
+
+    def _update_indicator(self) -> None:
+        """更新工具调用指示器文字"""
+        try:
+            indicator = self.query_one(".tool-indicator", Static)
+            tool_count = len(self._message.tool_calls)
+            toggle_hint = "(F3折叠)" if self._show_tool_details else "(F3展开)"
+            indicator.update(f"[工具:{tool_count}次] {toggle_hint}")
+        except NoMatches:
+            pass