AngularDart で Pinterestっぽい、Layout を試して見た。

Angular Dart で Pinterestっぽい、Design を試して見ました。
https://github.com/firefirestyle/ebook_windstyle_markdown/tree/master/angular/tiny-dynamicblock



隙間なく、四角形を詰めていくデモです。

コンストラクターで ElementRef を取得できる事がわかれば
簡単に書けますね!!

コード

main.dart

import 'package:angular2/platform/browser.dart';
import 'package:angular2/core.dart';
import 'dart:async';
import 'dart:html' as html;
import 'dynablock.dart' as dyna;
import 'dart:math';

main() {
  bootstrap(AppComponent);
}

class DynamicItemParam {
  int w;
  int h;

  DynamicItemParam() {
    Random rnd = new Random();
    w = rnd.nextInt(100) + 50;
    h = rnd.nextInt(200) + 100;
  }
}

@Component(
  selector: 'dynamicitem',
  template: """
  xxx
  """,
)
class DynamicItem implements OnInit {
  @Input()
  DynamicComponent parent;

  @Input()
  int width = 100;

  @Input()
  int height = 200;

  final ElementRef element;

  DynamicItem(this.element) {
    (element.nativeElement as html.Element).style.width = "${width}px";
    (element.nativeElement as html.Element).style.height = "${height}px";
    (element.nativeElement as html.Element).style.color = "#FF00";
    (element.nativeElement as html.Element).style.padding = "0px";
    (element.nativeElement as html.Element).style.margin = "0px";
    (element.nativeElement as html.Element).style.backgroundColor = 'yellow';
    (element.nativeElement as html.Element).style.display = 'inline-block';
    (element.nativeElement as html.Element).style.border =
    "medium solid #333333";
  }

  ngOnInit() {
    print("xx1 ${element.nativeElement}");
    (element.nativeElement as html.Element).style.width = "${width}px";
    (element.nativeElement as html.Element).style.height = "${height}px";
    if (parent != null) {
      parent.append(this);
    }
  }
}


@Component(
  selector: 'markdown-component',
  directives: const [DynamicItem],
  template: """
  <div #markdowncontent>
    <dynamicitem  *ngFor='let c of contents' [parent]='own' [width]='c.w' [height]='c.h' ></dynamicitem>
  </div>
  """,
)
class DynamicComponent implements OnInit {
  @Input()
  List<DynamicItemParam> contents;
  List<DynamicItem> items = [];

  html.Element _contentElement;
  dyna.DynaBlockCore dynaCore = new dyna.DynaBlockCore();


  final ElementRef element;
  DynamicComponent own;

  DynamicComponent(this.element) {
    var elm = element.nativeElement;
    elm.style.position = "absolute";
    own = this;
  }

  @ViewChild('markdowncontent')
  set main(ElementRef elementRef) {
    _contentElement = elementRef.nativeElement;
    print("${elementRef} ${elementRef.nativeElement}");
    _contentElement.onChange.listen((e) {
      print("-a");
    });
  }

  append(DynamicItem ap) {
    print("XXS");
    var elm = ap.element.nativeElement;
    int margineW = 10;
    int margineH = 10;
    dyna.FreeSpaceInfo info = dynaCore.addBlock(
        ap.width + margineW, ap.height + margineH);
    elm.style.position = "absolute";
    elm.style.left = "${info.xs}px";
    elm.style.top = "${info.y}px";
  }

  ngOnInit() {
  }
}

@Component(
    selector: 'my-app',
    directives: const [DynamicComponent],
    template: """
    <markdown-component [contents]='contents'></markdown-component>
  """
)
class AppComponent implements OnInit {
  List<DynamicItemParam> contents = [
    new DynamicItemParam(),
    new DynamicItemParam(),
    new DynamicItemParam(),
    new DynamicItemParam(),
  ];

  ngOnInit() async {
    for (int i = 0; i < 10; i++) {
      contents.add(new DynamicItemParam());
      await new Future.delayed(new Duration(milliseconds: 500));
    }
  }
}

四角形を埋め尽くすアルゴ

https://github.com/firefirestyle/ebook_windstyle_markdown/blob/master/angular/tiny-dynamicblock/app/web/dynablock.dart