✨ Limit content and read more in posts

lib/screens/posts/post_detail.dart

@@ -61,6 +61,7 @@ class _PostDetailScreenState extends State<PostDetailScreen> {
                   item: item!,
                   isClickable: true,
                   isFullDate: true,
+                  isFullContent: true,
                   isShowReply: false,
                   isContentSelectable: true,
                 ),

lib/translations/en_us.dart

@@ -361,4 +361,5 @@ const i18nEnglish = {
   'stickerUploaderName': 'Name',
   'stickerUploaderNameHint':
       'A human-friendly name given to the user in the sticker selection interface.',
+  'readMore': 'Read more',
 };

lib/translations/zh_cn.dart

@@ -329,4 +329,5 @@ const i18nSimplifiedChinese = {
   'stickerUploaderAliasHint': '将会在输入时使用和贴图包前缀组成占位符。',
   'stickerUploaderName': '贴图名称',
   'stickerUploaderNameHint': '在贴图选择界面提供给用户的人类友好名称。',
+  'readMore': '阅读更多',
 };

lib/widgets/posts/post_item.dart

@@ -1,5 +1,6 @@
 import 'package:animations/animations.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/rendering.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 import 'package:get/get_utils/get_utils.dart';
 import 'package:intl/intl.dart';
@@ -23,6 +24,7 @@ class PostItem extends StatefulWidget {
   final bool isShowReply;
   final bool isShowEmbed;
   final bool isFullDate;
+  final bool isFullContent;
   final bool isContentSelectable;
   final String? attachmentParent;
   final Color? backgroundColor;
@@ -36,6 +38,7 @@ class PostItem extends StatefulWidget {
     this.isShowReply = true,
     this.isShowEmbed = true,
     this.isFullDate = false,
+    this.isFullContent = false,
     this.isContentSelectable = false,
     this.attachmentParent,
     this.backgroundColor,
@@ -256,6 +259,8 @@ class _PostItemState extends State<PostItem> {
     );
   }
 
+  double _contentHeight = 0;
+
   @override
   Widget build(BuildContext context) {
     final List<int> attachments = item.body['attachments'] is List
@@ -327,11 +332,31 @@ class _PostItemState extends State<PostItem> {
                     _buildHeader(),
                     SizedContainer(
                       maxWidth: 640,
-                      child: MarkdownTextContent(
-                        content: item.body['content'],
-                        isSelectable: widget.isContentSelectable,
-                      ).paddingOnly(left: 12, right: 8),
+                      maxHeight: widget.isFullContent ? double.infinity : 320,
+                      child: _MeasureSize(
+                        onChange: (size) {
+                          _contentHeight = size.height;
+                        },
+                        child: MarkdownTextContent(
+                          content: item.body['content'],
+                          isSelectable: widget.isContentSelectable,
+                        ).paddingOnly(left: 12, right: 8),
+                      ),
                     ),
+                    if (_contentHeight >= 320 &&
+                        widget.isClickable &&
+                        !widget.isFullContent)
+                      InkWell(
+                        child: Text(
+                          'readMore'.tr,
+                          style: TextStyle(
+                            color: Theme.of(context).colorScheme.primary,
+                          ),
+                        ),
+                        onTap: () {
+                          openContainer();
+                        },
+                      ).paddingOnly(left: 12, top: 4),
                     if (widget.item.replyTo != null && widget.isShowEmbed)
                       _buildReply(context).paddingOnly(top: 4),
                     if (widget.item.repostTo != null && widget.isShowEmbed)
@@ -388,3 +413,46 @@ class _PostItemState extends State<PostItem> {
     );
   }
 }
+
+typedef _OnWidgetSizeChange = void Function(Size size);
+
+class _MeasureSizeRenderObject extends RenderProxyBox {
+  Size? oldSize;
+  _OnWidgetSizeChange onChange;
+
+  _MeasureSizeRenderObject(this.onChange);
+
+  @override
+  void performLayout() {
+    super.performLayout();
+
+    Size newSize = child!.size;
+    if (oldSize == newSize) return;
+
+    oldSize = newSize;
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      onChange(newSize);
+    });
+  }
+}
+
+class _MeasureSize extends SingleChildRenderObjectWidget {
+  final _OnWidgetSizeChange onChange;
+
+  const _MeasureSize({
+    super.key,
+    required this.onChange,
+    required Widget super.child,
+  });
+
+  @override
+  RenderObject createRenderObject(BuildContext context) {
+    return _MeasureSizeRenderObject(onChange);
+  }
+
+  @override
+  void updateRenderObject(
+      BuildContext context, covariant _MeasureSizeRenderObject renderObject) {
+    renderObject.onChange = onChange;
+  }
+}

lib/widgets/sized_container.dart

@@ -3,11 +3,13 @@ import 'package:flutter/material.dart';
 class SizedContainer extends StatelessWidget {
   final Widget child;
   final double maxWidth;
+  final double maxHeight;
 
   const SizedContainer({
     super.key,
     required this.child,
     this.maxWidth = 720,
+    this.maxHeight = double.infinity,
   });
 
   @override
@@ -15,7 +17,7 @@ class SizedContainer extends StatelessWidget {
     return Align(
       alignment: Alignment.centerLeft,
       child: Container(
-        constraints: BoxConstraints(maxWidth: maxWidth),
+        constraints: BoxConstraints(maxWidth: maxWidth, maxHeight: maxHeight),
         child: child,
       ),
     );