From f2620ed22bd5979ad42bcf54da403cdd5ecc074b Mon Sep 17 00:00:00 2001
From: PH2 <1293456824@qq.com>
Date: Fri, 25 Sep 2020 20:27:09 +0800
Subject: [PATCH] =?UTF-8?q?1=E3=80=81=E6=B7=BB=E5=8A=A0=E9=AA=A8=E6=9E=B6?=
 =?UTF-8?q?=E5=9B=BE=E5=B7=A5=E5=85=B7=E7=B1=BB=202=E3=80=81=E6=B7=BB?=
 =?UTF-8?q?=E5=8A=A0sliver=20delegate=E5=B7=A5=E5=85=B7=E7=B1=BB?=
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---
 lib/models/base/widget_model.dart             |  2 +-
 ...tom_sliver_persistent_header_delegate.dart | 32 +++++++++++++++++++
 lib/util/shimmer_util.dart                    | 16 ++++++++++
 lib/util/sliver_tab_bar_delegate.dart         | 23 +++++++++++++
 4 files changed, 72 insertions(+), 1 deletion(-)
 create mode 100644 lib/util/custom_sliver_persistent_header_delegate.dart
 create mode 100644 lib/util/shimmer_util.dart
 create mode 100644 lib/util/sliver_tab_bar_delegate.dart

diff --git a/lib/models/base/widget_model.dart b/lib/models/base/widget_model.dart
index 6f806dc..8b12f3a 100644
--- a/lib/models/base/widget_model.dart
+++ b/lib/models/base/widget_model.dart
@@ -45,7 +45,7 @@ class WidgetModel {
       this.isGlobal});
 
   WidgetModel.fromJson(Map<String, dynamic> json) {
-    modId = json['mod_id'];
+    modId = json['mod_id'] is int ? json['mod_id'] as int : int.parse(json['mod_id']?.toString());
     modPid = json['mod_pid'];
     modName = json['mod_name'];
     position = json['position'];
diff --git a/lib/util/custom_sliver_persistent_header_delegate.dart b/lib/util/custom_sliver_persistent_header_delegate.dart
new file mode 100644
index 0000000..8aaebf3
--- /dev/null
+++ b/lib/util/custom_sliver_persistent_header_delegate.dart
@@ -0,0 +1,32 @@
+// 自定义 SliverPersistentHeaderDelegate
+import 'package:flutter/material.dart';
+
+class CustomSliverPersistentHeaderDelegate extends SliverPersistentHeaderDelegate {
+  final double max; // 最大高度
+  final double min; // 最小高度
+  final Widget child; // 需要展示的内容
+
+  CustomSliverPersistentHeaderDelegate({@required this.max, @required this.min, @required this.child})
+      // 如果 assert 内部条件不成立，会报错
+      : assert(max != null),
+        assert(min != null),
+        assert(child != null),
+        assert(min <= max),
+        super();
+
+  // 返回展示的内容，如果内容固定可以直接在这定义，如果需要可扩展，这边通过传入值来定义
+  @override
+  Widget build(BuildContext context, double shrinkOffset, bool overlapsContent) => child;
+
+  @override
+  double get maxExtent => max; // 返回最大高度
+
+  @override
+  double get minExtent => min; // 返回最小高度
+
+  @override
+  bool shouldRebuild(CustomSliverPersistentHeaderDelegate oldDelegate) {
+    // 是否需要更新，这里我们定义当高度范围和展示内容被替换的时候进行刷新界面
+    return max != oldDelegate.max || min != oldDelegate.min || child != oldDelegate.child;
+  }
+}
diff --git a/lib/util/shimmer_util.dart b/lib/util/shimmer_util.dart
new file mode 100644
index 0000000..fe548c2
--- /dev/null
+++ b/lib/util/shimmer_util.dart
@@ -0,0 +1,16 @@
+import 'package:flutter/material.dart';
+import 'package:shimmer/shimmer.dart';
+
+class ShimmerUtil {
+  static Widget getShimmerWidget({double width, double height, double radius = 0}) {
+    return Shimmer.fromColors(
+      baseColor: Colors.grey[300],
+      highlightColor: Colors.grey[100],
+      child: Container(
+        width: width,
+        height: height,
+        decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(radius)),
+      ),
+    );
+  }
+}
diff --git a/lib/util/sliver_tab_bar_delegate.dart b/lib/util/sliver_tab_bar_delegate.dart
new file mode 100644
index 0000000..874e76d
--- /dev/null
+++ b/lib/util/sliver_tab_bar_delegate.dart
@@ -0,0 +1,23 @@
+import 'package:flutter/material.dart';
+
+class SliverTabBarDelegate extends SliverPersistentHeaderDelegate {
+  final TabBar widget;
+
+  const SliverTabBarDelegate(this.widget) : assert(widget != null);
+
+  @override
+  Widget build(BuildContext context, double shrinkOffset, bool overlapsContent) {
+    return this.widget;
+  }
+
+  @override
+  bool shouldRebuild(SliverTabBarDelegate oldDelegate) {
+    return false;
+  }
+
+  @override
+  double get maxExtent => widget.preferredSize.height;
+
+  @override
+  double get minExtent => widget.preferredSize.height;
+}