blog demo

Author: lilei

sample/lib/demo/main.dart

@@ -0,0 +1,87 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/rendering.dart';
+
+void main() => runApp(MyApp());
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Blog Demo',
+      theme: ThemeData(
+        primarySwatch: Colors.blue,
+      ),
+      home: MyHomePage(title: 'Blog Demo'),
+    );
+  }
+}
+
+class MyHomePage extends StatefulWidget {
+  MyHomePage({Key key, this.title}) : super(key: key);
+
+  final String title;
+
+  @override
+  _MyHomePageState createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: Center(child: Text(widget.title))),
+      body: ListView.builder(
+          itemBuilder: (BuildContext context, int index) {
+            return Container(
+                alignment: Alignment.center,
+                child: Transform(
+                    transform: Matrix4.translationValues(100, 0, 0),
+                    child: _CustomRenderObjectWidget(
+                      child: Transform(
+                          transform: Matrix4.translationValues(-50, 0, 0),
+                          child: Container(
+                              alignment: Alignment.center,
+                              width: 100,
+                              height: 100,
+                              color: Colors.black,
+                              child: Text(
+                                "Text",
+                                style: TextStyle(color: Colors.white),
+                              ))),
+                    )));
+          },
+          itemCount: 10),
+    );
+  }
+}
+
+class _CustomRenderObjectWidget extends SingleChildRenderObjectWidget {
+  final Widget child;
+
+  _CustomRenderObjectWidget({this.child}) : super(child: child);
+  @override
+  RenderObject createRenderObject(BuildContext context) {
+    return _CustomRenderObject();
+  }
+}
+
+class _CustomRenderObject extends RenderProxyBox {
+  @override
+  void paint(PaintingContext context, Offset offset) {
+    super.paint(context, offset);
+    print(offset);
+    context.canvas.drawCircle(offset, 3, Paint()..color = Colors.red);
+  }
+}
+
+class _BorderLinePainter extends CustomPainter {
+  @override
+  void paint(Canvas canvas, Size size) {
+    canvas.drawCircle(Offset.zero, 3, Paint()..color = Colors.red);
+  }
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) {
+    return true;
+  }
+}