TValuePath
Immutable path that identifies a
TValueInheritance
| Level | Ancestor | Description |
|---|---|---|
| 1 | TObject | Ultimate ancestor in a class hierarchy |
| 2 | TBaseObject | A base class for objects that can be used instead of TObject. |
| 3 | TReferenceCountedObject | Object that keeps track of the number of times it is referenced from other objects |
| 4 | TValuePath |
Source
Value.Path.pas (31)
Description
A TValue is often created in a context of other values. A TValuePath
tracks all parent values leading up to last value. A common use for such a path is in a user interface
where values are created and explored dynamically. Tracking parent values in a path can be used for:
- Keeping the parent values alive as long as the child values need them to
- Locating and exploring parent values
- Creating contextual captions for child values
A TValuePath is an immutable object. A child path can be created using Extend.
Fields
| Scope | Visibility | Type | Name | Description |
|---|---|---|---|---|
| Instance | protected | TList<TValue> | Values |
Methods
| Scope | Visibility | Result | Name | Description |
|---|---|---|---|---|
| Instance | protected | TInteger32 | GetLength() | |
| Instance | protected | TValue | GetNodes(Index: TInteger32) | |
| Instance | protected | TValue | GetReversedNodes(Index: TInteger32) | |
| Instance | protected | TValue | GetLast() | |
| Instance | protected | TObject | ExtractObject(Object_: TObject) | |
| Instance | public | Create(Elements: array of TValue) | ||
| Instance | public | Destroy() | ||
| Instance | public | TBoolean | HandleEvent(Event: TEvent) | |
| Instance | public | TValuePath | Extend(Elements: array of TValue) | |
| Instance | public | TValuePath | GetAncestor(Count: TInteger32) | |
| Instance | public | TObject | Find(Condition: TCondition<TObject>) | |
| Instance | public | TBoolean | Contains(Object_: TObject) | |
| Instance | public | TObject | Query(Query: TQuery; FreeQuery: TBoolean) | |
| Instance | public | TObject | ExtractLastObject() |