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pilot version of inheritance.md

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Kira Dmitrieva 2021-08-22 18:10:05 +03:00
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21
docs/inheritance.md
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@ -2,21 +2,16 @@
Inheritance is an ability of an element to transfer a pack of properties to its `children` elements 'wrapped inside'. Inheritance is an ability of an element to transfer a pack of properties to its `children` elements 'wrapped inside'.
`VisionBase` Properties, which can be inherited by objects, are `styles`, `prototypes` (if the object is a reference), `inherit` (it stands for the presence of `parent` objects), and `defaults`.
Properties have to be set in a specific order:
### Main properties' inheritance:
* styles - `StyleSheet`
* parents
* parent's styles
* defaults
All values of `styles` property are contained in class `StyleSheet`, where they all are defined at `Group`s level. The `prototypes` property tree is defined in `SolidGroup` class via `PrototypeHolder` interface, and
`SolidReference` class helps to reuse a template object.
`SolidReference` The order of inheritance of properties is set in function `getPropertyValue` in `VisionBase` class.
As for `prototypes`, this property has to be set after styles, but before parents. So the order will be this: The order is this:
### Reference properties' inheritance: * own styles
* styles * prototypes
* prototypes - `PrototypeHolder` in `SolidGroup` * parent
* parents
* parent's styles * parent's styles
* defaults * defaults

4
visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/Vision.kt
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@ -36,7 +36,7 @@ public interface Vision : Described, Configurable {
public val manager: VisionManager? get() = parent?.manager public val manager: VisionManager? get() = parent?.manager
/** /**
* This Vision own properties (ignoring inheritance, styles and defaults * This Vision own properties (ignoring inheritance, styles and defaults)
*/ */
override val meta: ObservableMutableMeta override val meta: ObservableMutableMeta
@ -92,7 +92,7 @@ public val Vision.propertyChanges: Flow<Name>
} }
/** /**
* Subscribe on property updates. The subscription is bound to the given [scope] and canceled when the scope is canceled * Subscribe on property updates. The subscription is bound to the given scope and canceled when the scope is canceled
*/ */
public fun Vision.onPropertyChange(callback: Meta.(Name) -> Unit) { public fun Vision.onPropertyChange(callback: Meta.(Name) -> Unit) {
meta.onChange(null, callback) meta.onChange(null, callback)