EmpireNullableDoubleProperty class Null safety

An EmpireProperty with similar characteristics of dart double objects

The underlying value can be null.

You can perform most arithmetic operator on this (+, -, /, *). If the underlying value of this is null and an arithmetic operator is called on this, it will throw a EmpirePropertyNullValueException.

Unary operators are not supported (++, --, +=, -=, etc)

You can easily check for null by accessing the isNull or isNotNull properties.

When the value of this changes, it will send a EmpireStateChanged event by default. This includes automatically triggering a UI rebuild.

Example

late final EmpireNullableDoubleProperty percentage;

percentage = createNullableDoubleProperty();

if (percentage.isNull)
{
  print("I'm Null");
}

Other Usages Examples


late final EmpireNullableDoubleProperty percentage;

percentage = createNullableDoubleProperty();

print('${percentage + 5.2}'); //throws EmpireNullValueException because no value has been set yet.

percentage(10.0)

print('${percentage - 0.5}'); //prints 9.5
Inheritance

Constructors

EmpireNullableDoubleProperty(double? value, EmpireViewModel viewModel, {String? propertyName})

Properties

hashCode → int
The hash code for this object.
read-only, inherited
isNegative → bool
Whether this number is negative.
read-only
isNotNull → bool
read-only, inherited
isNull → bool
read-only, inherited
originalValue → double?
read-only, inherited
propertyName ↔ String?
read / write, inherited
runtimeType → Type
A representation of the runtime type of the object.
read-only, inherited
value → double?
read-only, inherited

Methods

call(double? value, {bool notifyChange = true}) → void
inherited
equals(dynamic other) → bool
Checks if other is equal to the value of this EmpireProperty
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
reset({bool notifyChange = true}) → void
Resets the value to what it was initialized with.
inherited
round() → int?
Returns the integer closest to the double value.
roundToDouble() → double?
Returns the integer double value closest to the double value.
set(double? value, {bool notifyChange = true}) → double?
Updates the property value. Notifies any listeners to the change
inherited
setOriginalValueToCurrent() → void
Updates the original value to what the current value of this property is.
inherited
toInt() → int?
Truncates the double value and returns the int
toString() → String
A string representation of this object.
inherited

Operators

operator %(dynamic other) → double
operator *(dynamic other) → double
operator +(dynamic other) → double
operator -(dynamic other) → double
operator /(dynamic other) → double
operator ==(dynamic other) → bool
The equality operator.
inherited