Implement ListView.builder and ListView.separated

 # Changelog
 
+## 1.3.23
+
+- Implement ListView.builder and ListView.separated
+
 ## 1.3.22
 
 - Fix Text alignment

@@ -546,17 +546,99 @@ class Spacer extends StatelessWidget {
   }
 }
 
-class ListView extends Flex {
-  ListView(
-      {Axis direction = Axis.vertical,
-      // EdgeInsets padding,
-      // double spacing = 0.0,
-      List<Widget> children = const <Widget>[]})
-      : super(
-            direction: direction,
-            mainAxisAlignment: MainAxisAlignment.start,
-            mainAxisSize: MainAxisSize.max,
-            crossAxisAlignment: CrossAxisAlignment.center,
-            verticalDirection: VerticalDirection.down,
-            children: children);
+typedef IndexedWidgetBuilder = Widget Function(Context context, int index);
+
+class ListView extends StatelessWidget {
+  ListView({
+    this.direction = Axis.vertical,
+    this.reverse = false,
+    this.spacing = 0,
+    this.padding,
+    this.children = const <Widget>[],
+  })  : itemBuilder = null,
+        separatorBuilder = null,
+        itemCount = children.length,
+        super();
+
+  ListView.builder({
+    this.direction = Axis.vertical,
+    this.reverse = false,
+    this.spacing = 0,
+    this.padding,
+    @required this.itemBuilder,
+    @required this.itemCount,
+  })  : children = null,
+        separatorBuilder = null,
+        super();
+
+  ListView.separated({
+    this.direction = Axis.vertical,
+    this.reverse = false,
+    this.padding,
+    @required this.itemBuilder,
+    @required this.separatorBuilder,
+    @required this.itemCount,
+  })  : children = null,
+        spacing = null,
+        super();
+
+  final Axis direction;
+  final EdgeInsets padding;
+  final double spacing;
+  final bool reverse;
+  final IndexedWidgetBuilder itemBuilder;
+  final IndexedWidgetBuilder separatorBuilder;
+  final List<Widget> children;
+  final int itemCount;
+
+  Widget _getItem(Context context, int index) {
+    return children == null ? itemBuilder(context, index) : children[index];
+  }
+
+  Widget _getSeparator(Context context, int index) {
+    return spacing == null
+        ? separatorBuilder(context, index)
+        : direction == Axis.vertical
+            ? SizedBox(height: spacing)
+            : SizedBox(width: spacing);
+  }
+
+  @override
+  Widget build(Context context) {
+    final List<Widget> _children = <Widget>[];
+
+    if (reverse) {
+      for (int index = itemCount - 1; index >= 0; index--) {
+        _children.add(_getItem(context, index));
+        if (spacing != 0 && index > 0) {
+          _children.add(_getSeparator(context, index));
+        }
+      }
+    } else {
+      for (int index = 0; index < itemCount; index++) {
+        _children.add(_getItem(context, index));
+        if (spacing != 0 && index < itemCount - 1) {
+          _children.add(_getSeparator(context, index));
+        }
+      }
+    }
+
+    final Widget widget = Flex(
+      direction: direction,
+      mainAxisAlignment: MainAxisAlignment.start,
+      mainAxisSize: MainAxisSize.max,
+      crossAxisAlignment: CrossAxisAlignment.center,
+      verticalDirection: VerticalDirection.down,
+      children: _children,
+    );
+
+    if (padding != null) {
+      return Padding(
+        padding: padding,
+        child: widget,
+      );
+    }
+
+    return widget;
+  }
 }

@@ -4,7 +4,7 @@ description: A pdf producer for Dart. It can create pdf files for both web or fl
 homepage: https://github.com/DavBfr/dart_pdf/tree/master/pdf
 repository: https://github.com/DavBfr/dart_pdf
 issue_tracker: https://github.com/DavBfr/dart_pdf/issues
-version: 1.3.22
+version: 1.3.23
 
 environment:
   sdk: ">=2.1.0 <3.0.0"

@@ -29,6 +29,7 @@ import 'type1_test.dart' as type1;
 import 'widget_basic_test.dart' as widget_basic;
 import 'widget_clip_test.dart' as widget_clip;
 import 'widget_container_test.dart' as widget_container;
+import 'widget_flex_test.dart' as widget_flex;
 import 'widget_multipage_test.dart' as widget_multipage;
 import 'widget_table_test.dart' as widget_table;
 import 'widget_test.dart' as widget;
@@ -51,6 +52,7 @@ void main() {
   widget_basic.main();
   widget_clip.main();
   widget_container.main();
+  widget_flex.main();
   widget_multipage.main();
   widget_table.main();
   widget_text.main();

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import 'dart:io';
+
+import 'package:pdf/pdf.dart';
+import 'package:pdf/widgets.dart';
+import 'package:test/test.dart';
+
+Document pdf;
+
+void main() {
+  setUpAll(() {
+    Document.debug = true;
+    pdf = Document();
+  });
+
+  test('Flex Widgets ListView', () {
+    pdf.addPage(
+      Page(
+        build: (Context context) => ListView(
+          spacing: 20,
+          padding: const EdgeInsets.all(10),
+          children: <Widget>[
+            Text('Line 1'),
+            Text('Line 2'),
+            Text('Line 3'),
+          ],
+        ),
+      ),
+    );
+  });
+
+  test('Flex Widgets ListView.builder', () {
+    pdf.addPage(
+      Page(
+        build: (Context context) => ListView.builder(
+          itemBuilder: (Context context, int index) => Text('Line $index'),
+          itemCount: 30,
+          spacing: 2,
+          reverse: true,
+        ),
+      ),
+    );
+  });
+
+  test('Flex Widgets ListView.separated', () {
+    pdf.addPage(
+      Page(
+        build: (Context context) => ListView.separated(
+          separatorBuilder: (Context context, int index) => Container(
+            color: PdfColors.grey,
+            height: 0.5,
+            margin: const EdgeInsets.symmetric(vertical: 10),
+          ),
+          itemBuilder: (Context context, int index) => Text('Line $index'),
+          itemCount: 10,
+        ),
+      ),
+    );
+  });
+
+  tearDownAll(() {
+    final File file = File('widgets-flex.pdf');
+    file.writeAsBytesSync(pdf.save());
+  });
+}