Move generate_id.dart to api

Author: BirjuVachhani

lib/codelessly_api.dart

@@ -4,11 +4,12 @@
 
 library codelessly_api;
 
+export 'src/api/constants.dart';
+export 'src/api/custom_component.dart';
+export 'src/api/generate_id.dart';
+export 'src/api/math_helper.dart';
 export 'src/api/mixins.dart';
 export 'src/api/models/models.dart';
 export 'src/api/node_json_converter.dart';
 export 'src/api/nodes/nodes.dart';
 export 'src/api/utils.dart';
-export 'src/api/constants.dart';
-export 'src/api/custom_component.dart';
-export 'src/api/math_helper.dart';

lib/src/api/generate_id.dart

@@ -0,0 +1,50 @@
+import 'dart:math' as math;
+
+/// Modeled after base64 web-safe chars, but ordered by ASCII.
+const String _kPushChars =
+    '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz';
+
+/// Implementation from https://gist.github.com/mikelehen/3596a30bd69384624c11
+///
+/// Fancy ID generator that creates 20-character string identifiers with the following properties:
+///
+/// 1. They're based on timestamp so that they sort *after* any existing ids.
+/// 2. They contain 72-bits of random data after the timestamp so that IDs won't collide with other clients' IDs.
+/// 3. They sort *lexicographically* (so the timestamp is converted to characters that will sort properly).
+/// 4. They're monotonically increasing.  Even if you generate more than one in the same timestamp, the
+///    latter ones will sort after the former ones.  We do this by using the previous random bits
+///    but "incrementing" them by 1 (only in the case of a timestamp collision).
+String generateId() {
+  int lastPushTime = 0;
+  final List<int> randomSuffix = List.filled(12, 0);
+  final math.Random random = math.Random.secure();
+
+  final int now = DateTime.now().toUtc().millisecondsSinceEpoch;
+  String id = _toPushIdBase64(now, 8);
+
+  if (now != lastPushTime) {
+    for (int i = 0; i < 12; i += 1) {
+      randomSuffix[i] = random.nextInt(63);
+    }
+  } else {
+    int i;
+    for (i = 11; i >= 0 && randomSuffix[i] == 62; i--) {
+      randomSuffix[i] = 0;
+    }
+    randomSuffix[i] += 1;
+  }
+  final String suffixStr = randomSuffix.map((int i) => _kPushChars[i]).join();
+  lastPushTime = now;
+
+  return '$id$suffixStr';
+}
+
+String _toPushIdBase64(int value, int numChars) {
+  List<String> chars = List.filled(numChars, '');
+  for (int i = numChars - 1; i >= 0; i -= 1) {
+    chars[i] = _kPushChars[value % 63];
+    value = (value / 63).floor();
+  }
+  assert(value == 0);
+  return chars.join();
+}

lib/src/api/models/effect.dart

@@ -5,6 +5,7 @@
 import 'package:equatable/equatable.dart';
 import 'package:json_annotation/json_annotation.dart';
 
+import '../generate_id.dart';
 import '../mixins.dart';
 import 'models.dart';
 
@@ -43,6 +44,9 @@ enum ShadowProperty {
 /// A visual effect such as a shadow or blur.
 @JsonSerializable()
 class Effect with EquatableMixin, SerializableMixin {
+  /// Unique identifier of the effect.
+  final String id;
+
   /// Type of effect.
   final EffectType type;
 
@@ -66,59 +70,64 @@ class Effect with EquatableMixin, SerializableMixin {
   final Vec? offset;
 
   /// Creates new [Effect] with given data.
-  const Effect({
+  Effect({
+    String? id,
     required this.type,
     required this.radius,
     this.visible = true,
     this.color,
     this.blendMode,
     this.offset,
     this.spread,
-  });
+  }) : id = id ?? generateId();
 
   /// Creates a new [Effect] with drop shadow.
-  const Effect.dropShadow({
+  Effect.dropShadow({
+    String? id,
     this.type = EffectType.dropShadow,
     required this.radius,
     this.visible = true,
     required this.color,
     required this.offset,
     required this.spread,
     this.blendMode,
-  });
+  }) : id = id ?? generateId();
 
   /// Creates a new [Effect] with inner shadow.
-  const Effect.innerShadow({
+  Effect.innerShadow({
+    String? id,
     this.type = EffectType.innerShadow,
     required this.radius,
     this.visible = true,
     required this.color,
     required this.offset,
     required this.spread,
     this.blendMode,
-  });
+  }) : id = id ?? generateId();
 
   /// Creates a new [Effect] with layer blur.
-  const Effect.layerBlur({
+  Effect.layerBlur({
+    String? id,
     this.type = EffectType.layerBlur,
     required this.radius,
     this.visible = true,
     this.color,
     this.blendMode,
     this.offset,
     this.spread,
-  });
+  }) : id = id ?? generateId();
 
   /// Creates a new [Effect] with background blur.
-  const Effect.backgroundBlur({
+  Effect.backgroundBlur({
+    String? id,
     this.type = EffectType.backgroundBlur,
     required this.radius,
     this.visible = true,
     this.color,
     this.blendMode,
     this.offset,
     this.spread,
-  });
+  }) : id = id ?? generateId();
 
   /// Duplicates this instance with given data overrides.
   Effect copyWith({

lib/src/api/models/input_decoration.dart

@@ -174,52 +174,33 @@ class InputDecorationModel with EquatableMixin, SerializableMixin {
   final BoxConstraintsModel constraints;
 
   /// Creates [InputDecorationModel] with given data.
-  const InputDecorationModel({
+  InputDecorationModel({
     this.icon = const MultiSourceIconModel(),
     this.labelText,
-    this.labelStyle = const TextProp.general(
-      fontSize: 14,
-      fills: [PaintModel.blackPaint],
-    ),
-    this.floatingLabelStyle = const TextProp.general(
-      fontSize: 14,
-      fills: [PaintModel.blackPaint],
-    ),
+    TextProp? labelStyle,
+    TextProp? floatingLabelStyle,
     this.helperText,
-    this.helperStyle = const TextProp.general(
-      fontSize: 14,
-      fills: [PaintModel.blackPaint],
-    ),
+    TextProp? helperStyle,
     this.helperMaxLines = 1,
     this.hintText,
-    this.hintStyle = const TextProp.general(
-      fontSize: 14,
-      fills: [
-        PaintModel.solid(visible: true, opacity: 1, color: ColorRGB.grey)
-      ],
-    ),
+    TextProp? hintStyle,
     this.hintMaxLines = 1,
     this.errorText,
-    this.errorStyle = const TextProp.general(
-      fills: [PaintModel.solid(visible: true, opacity: 1, color: ColorRGB.red)],
-    ),
+    TextProp? errorStyle,
     this.errorMaxLines = 1,
     this.floatingLabelBehavior = FloatingLabelBehaviorEnum.auto,
     this.isCollapsed = false,
     this.isDense = true,
     this.prefixIcon = const MultiSourceIconModel(),
     this.prefixIconConstraints = const BoxConstraintsModel(),
     this.prefixText,
-    this.prefixStyle = const TextProp.general(),
+    TextProp? prefixStyle,
     this.suffixIcon = const MultiSourceIconModel(),
     this.suffixText,
-    this.suffixStyle = const TextProp.general(
-      fontSize: 14,
-      fills: [PaintModel.blackPaint],
-    ),
+    TextProp? suffixStyle,
     this.suffixIconConstraints = const BoxConstraintsModel(),
     this.counterText,
-    this.counterStyle = const TextProp.general(),
+    TextProp? counterStyle,
     this.filled = false,
     this.fillColor = ColorRGBA.grey10,
     this.focusColor = ColorRGBA.black,
@@ -244,7 +225,20 @@ class InputDecorationModel with EquatableMixin, SerializableMixin {
     this.semanticCounterText,
     this.alignLabelWithHint = true,
     this.constraints = const BoxConstraintsModel(),
-  });
+  })  : labelStyle = labelStyle ?? TextProp(fontSize: 14),
+        floatingLabelStyle = floatingLabelStyle ??
+            TextProp.general(fontSize: 14, fills: [PaintModel.blackPaint]),
+        helperStyle = helperStyle ??
+            TextProp.general(fontSize: 14, fills: [PaintModel.blackPaint]),
+        hintStyle = hintStyle ??
+            TextProp.general(
+                fontSize: 14, fills: [PaintModel.solid(color: ColorRGB.grey)]),
+        errorStyle = errorStyle ??
+            TextProp.general(fills: [PaintModel.solid(color: ColorRGB.red)]),
+        prefixStyle = prefixStyle ?? TextProp.general(),
+        suffixStyle = suffixStyle ??
+            TextProp.general(fontSize: 14, fills: [PaintModel.blackPaint]),
+        counterStyle = counterStyle ?? TextProp.general();
 
   /// Duplicates this instance with given data overrides.
   InputDecorationModel copyWith({