feat:键盘插件，处理气泡内容溢出问题

plugins/keyboard_android/example/lib/page/chat_page.dart

@@ -31,14 +31,29 @@ class ChatPageState extends State<ChatPage> {
   @override
   void initState() {
     super.initState();
-    _inputFocusNode.addListener(() {
-      // 输入框获取焦点，滚动列表到底部
-      _scrollToBottom();
-    });
+    _inputFocusNode.addListener(_handleTextFieldFocusChange);
     // 进入页面，就获取输入框焦点
     _inputFocusNode.requestFocus();
   }
 
+  @override
+  void dispose() {
+    // 取消监听
+    _inputFocusNode.removeListener(_handleTextFieldFocusChange);
+    _inputFocusNode.dispose();
+    _editingController.dispose();
+    _scrollController.dispose();
+    super.dispose();
+  }
+
+  /// 处理输入框的焦点变化
+  void _handleTextFieldFocusChange() {
+    if (_inputFocusNode.hasFocus) {
+      // 输入框获取焦点，滚动列表到底部
+      _scrollToBottom();
+    }
+  }
+
   /// 添加消息到消息列表中
   void _addMsg2List(String msg, bool isMe) {
     setState(() {
@@ -85,22 +100,34 @@ class ChatPageState extends State<ChatPage> {
 
   /// 构建聊天气泡
   Widget _buildMsgBubble(Msg msg) {
-    return BubbleWidget(
-      // 箭头方向
-      arrowDirection: msg.isMe ? AxisDirection.right : AxisDirection.left,
-      arrowOffset: 22,
-      arrowLength: 8,
-      arrowRadius: 4,
-      arrowWidth: 14,
-      padding: const EdgeInsets.all(12),
-      borderRadius: BorderRadius.circular(8),
-      backgroundColor:
-          msg.isMe
-              ? const Color.fromARGB(255, 164, 208, 238)
-              : const Color.fromARGB(255, 153, 231, 169),
-      contentBuilder: (context) {
-        return Text(msg.msg);
-      },
+    // 设置气泡的外边距，让气泡不易过长
+    double marginValue = 50;
+    EdgeInsets marginEdgeInsets;
+    if (msg.isMe) {
+      marginEdgeInsets = EdgeInsets.only(left: marginValue);
+    } else {
+      marginEdgeInsets = EdgeInsets.only(right: marginValue);
+    }
+    // Flexible，文本超过一行时，自动换行，并且不超过最大宽度，不超过一行时，则自动包裹内容
+    return Flexible(
+      child: BubbleWidget(
+        // 箭头方向
+        arrowDirection: msg.isMe ? AxisDirection.right : AxisDirection.left,
+        arrowOffset: 22,
+        arrowLength: 8,
+        arrowRadius: 4,
+        arrowWidth: 14,
+        padding: const EdgeInsets.all(12),
+        borderRadius: BorderRadius.circular(8),
+        margin: marginEdgeInsets,
+        backgroundColor:
+            msg.isMe
+                ? const Color.fromARGB(255, 164, 208, 238)
+                : const Color.fromARGB(255, 153, 231, 169),
+        contentBuilder: (context) {
+          return SelectableText(msg.msg);
+        },
+      ),
     );
   }
 
@@ -112,6 +139,8 @@ class ChatPageState extends State<ChatPage> {
       content = Row(
         // 如果是自己发的，则在右边
         mainAxisAlignment: MainAxisAlignment.end,
+        // 顶部对齐
+        crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           // 聊天气泡
           _buildMsgBubble(msg),
@@ -124,6 +153,8 @@ class ChatPageState extends State<ChatPage> {
       content = Row(
         // 如果是自己发的，则在右边
         mainAxisAlignment: MainAxisAlignment.start,
+        // 顶部对齐
+        crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           // 头像
           _buildAvatar(msg),
@@ -132,14 +163,15 @@ class ChatPageState extends State<ChatPage> {
         ],
       );
     }
-    return GestureDetector(
-      onLongPress: () {
-        // 长按消息，复制文本到剪切板
-        ClipboardUtil.copyToClipboard(msg.msg);
-        ToastUtil.showToast("已复制到剪切板");
-      },
-      child: Container(padding: const EdgeInsets.all(8.0), child: content),
-    );
+    // return GestureDetector(
+    //   onLongPress: () {
+    //     // 长按消息，复制文本到剪切板
+    //     ClipboardUtil.copyToClipboard(msg.msg);
+    //     ToastUtil.showToast("已复制到剪切板");
+    //   },
+    //   child: Container(padding: const EdgeInsets.all(8.0), child: content),
+    // );
+    return Container(padding: const EdgeInsets.all(8.0), child: content);
   }
 
   /// 构建头像