StyleValue

Remarks

The cascade works on interned strings, and is right to: deciding which declaration wins needs no opinion about what spring(1, 100, 10) means, and keeping it that way is what lets a stylesheet carry a property this engine has never heard of. Animation is the point at which that stops being enough — you cannot interpolate a string — so this is where the typing happens, once, on the values that are actually being animated.

A struct with an overlapping reading rather than a class hierarchy. There is one of these per animated property per element per frame, and a Number that costs a heap allocation to represent is a design that stops being usable at exactly the point a UI gets interesting.

Fields and properties (7)

• public StyleValueKind Kind

  What kind of value it is.

• public float Number

  The number, for Number and Length.

• public StyleUnit Unit

  The unit, for Length.

• public Color4 Color

  The colour, for Color. Linear, not sRGB-encoded.

• public int Keyword

  The interned identifier, for Keyword.

• public ReadOnlySpan<StyleValue> Items

  The parts, for List.

• public static StyleValue Unknown

  The value nothing could be made of.

Methods (14)

• public static StyleValue FromNumber(float value)

  A bare number.

• public static StyleValue FromLength(float value, StyleUnit unit)

  A length.

• public static StyleValue FromColor(Color4 colour)

  A colour.

• public static StyleValue FromKeyword(int keyword)

  An identifier.

• public static StyleValue FromList(StyleValue[] parts)

  A sequence of values.

• public static bool CanInterpolate(StyleValue from, StyleValue to)

  Whether two values can be interpolated between.

• public static StyleValue Lerp(StyleValue from, StyleValue to, float amount)

  Interpolates between two values.

• public bool Equals(StyleValue other)

  Indicates whether the current object is equal to another object of the same type.

• public override bool Equals(object? obj)

  Indicates whether this instance and a specified object are equal.

• public override int GetHashCode()

  Returns the hash code for this instance.

• public static bool operator ==(StyleValue left, StyleValue right)

  Compares two values.

• public static bool operator !=(StyleValue left, StyleValue right)

  Compares two values.

• public string ToCss(NameTable names)

  Writes the value back as CSS text.

• public override string ToString()

  Returns the fully qualified type name of this instance.

Used by (12)

• AnimationTestsVixen.Ui.Styling.Tests
• AnimatorVixen.Ui.Styling
• CompactionTestsVixen.Ui.Styling.Tests
• DrawListBuilderVixen.Ui
• LayoutStyleBuilderVixen.Ui
• LengthContextVixen.Ui
• MultipleAnimationTestsVixen.Ui.Styling.Tests
• RunningTransitionVixen.Ui.Styling
• StyleValueParserVixen.Ui.Styling
• StyleValueTestsVixen.Ui.Styling.Tests
• TransitionTestsVixen.Ui.Styling.Tests
• UiDocumentVixen.Ui