chore(forms): add demo for repeatable forms

Closes dart-archive#1044

Author: matsko

example/web/forms/angular-logo.png

@@ -0,0 +1,144 @@
+import 'package:angular/angular.dart';
+import 'package:angular/application_factory.dart';
+import 'dart:math';
+
+@Controller(
+  selector: '[form-controller]',
+  publishAs: 'form_ctrl')
+class FormCtrl {
+
+  static const String COLOR_HEX = "hex";
+  static const String COLOR_HSL = "hsl";
+  static const String COLOR_RGB = "rgb";
+  static const String COLOR_NAME = "name";
+
+  Scope scope;
+  NgForm form;
+  List colors = [];
+  List lastFormattedColors = [];
+
+  FormCtrl(Scope this.scope, NgForm this.form) {
+    newColor(COLOR_HEX, '#222');
+    newColor(COLOR_HEX, '#444');
+    newColor(COLOR_HEX, '#000');
+  }
+
+  get color_types => [COLOR_RGB, COLOR_HSL, COLOR_HEX, COLOR_NAME];
+  get resolutions => [
+    '1024x600',
+    '1280x800',
+    '1366x768',
+    '1440x900',
+    '1600x900',
+    '1680x1050',
+    '1920x1080',
+    '1920x1200',
+    '2560x1440',
+    '2560x1600'
+  ];
+
+  submit() {
+    this.form.reset();
+  }
+
+  getTotalSquares(value) {
+    int defaultValue = 4;
+    if(value != null) {
+      try {
+        value = double.parse(value.toString());
+      } catch(e) {
+        value = defaultValue;
+      }
+    } else {
+      value = defaultValue;
+    }
+    return (value * value).toInt();
+  }
+
+  formatColors() {
+    var formatted = [];
+    colors.forEach((color) {
+      var value = null;
+      switch(color['type']) {
+        case COLOR_HEX:
+          value = color['hex'];
+          break;
+        case COLOR_HSL:
+          var hue = color['hue'];
+          var saturation = color['saturation'];
+          var luminance = color['luminance'];
+          if(hue != null && saturation != null && luminance != null) {
+            value = "hsl($hue, $saturation%, $luminance%)";
+          }
+          break;
+        case COLOR_RGB:
+          var red = color['red'];
+          var blue = color['blue'];
+          var green = color['green'];
+          if(red != null && green != null && blue != null) {
+            value = "rgb($red, $green, $blue)";
+          }
+          break;
+        default: //COLOR_NAME
+          value = color['name'];
+          break;
+      }
+      if(value != null) {
+        formatted.add(value);
+      }
+    });
+    lastFormattedColors = formatted;
+    return formatted;
+  }
+
+  newColor([String type = COLOR_HEX, String color]) {
+    var data = {
+      'id' : colors.length,
+      'type' : type,
+      'hex' : '',
+      'hue' : '',
+      'saturation' : '',
+      'luminance' : '',
+      'red' : '',
+      'green' : '',
+      'blue': '',
+      'name': ''
+    };
+    if(type == COLOR_HEX) {
+      data['hex'] = color;
+    }
+    colors.add(data);
+  }
+}
+
+@Controller(
+  selector: '[preview-controller]',
+  publishAs: 'preview')
+class PreviewCtrl {
+
+  static const DEFAULT_COLOR = '#555';
+
+  List _collection = [];
+
+  expandList(items, limit) {
+    _collection.clear();
+    if(items != null && items.length > 0) {
+      for (var i = 0; i < limit; i++) {
+        var x = i % items.length;
+        _collection.add(items[x]);
+      }
+    }
+    return _collection;
+  }
+}
+
+class FormModule extends Module {
+  FormModule() {
+    type(FormCtrl);
+    type(PreviewCtrl);
+  }
+}
+
+main() {
+  applicationFactory().addModule(new FormModule()).run();
+}