@Operator
This add(Obj val, Str? name := null)

Add a slot. If name is null one is auto-generated otherwise the name must be unique.

Obj? call(Str name, Obj? arg := null)

Call a method slot synchronously. If slot is not found then silently ignore and return null. If slot is defined but not a Function or the Function must be called asynchronously then raise exception.

Void callAsync(Str name, Obj? arg, |Err?,Obj?| cb)

Call a method slot asynchronously. If slot is not found then silently ignore and return null. If slot is defined but not an Function then raise exception.

virtual Comp? child(Str name, Bool checked := true)

Lookup a child component by name

Str dis()

Return display string for this component

Void each(|Obj,Str| f)

Iterate slot name/value pairs using same semantics as get.

Void eachChild(|Comp,Str| f)

Iterate children components in the tree structure

Obj? eachWhile(|Obj,Str->Obj?| f)

Iterate name/value pairs until callback returns non-null

@Operator
Obj? get(Str name)

Get the given slot value or null if slot name not defined.

Bool has(Str name)

Return true if this component has a slot by given name.

Bool hasChild(Str name)

Check if a child component is mapped by the given name

Ref id()

Return id that uniquely identifies this component within its space.

Bool isAbove(Comp child)

Is this is an ancestor in the tree of the given component. If the given component is this, then return true.

Bool isBelow(Comp parent)

Is this component is a descendant in the tree of the given component. If the given component is this, then return true.

Bool isMounted()

Return if this component is mounted into a component space

Links links()

Gets links slot as dict of incoming component links

Bool missing(Str name)

Return true if the component does not have a slot by given name.

Str name()

Slot name under parent or "" if parent is null

Void onCall(Str name, |This,Obj?| cb)

Callback when a method is called. This is an observer callback only and will not determine the result value of calling a method.

Void onCallRemove(Str name, Func cb)

Remove an onCall callback

virtual Void onCallThis(Str name, Obj? arg)

Callback on instance itself when a call is invoked.

Void onChange(Str name, |This,Obj?| cb)

Callback when a slot is modified. The newVal is null if the slot was removed.

Void onChangeRemove(Str name, Func cb)

Remove an onChange callback

virtual Void onChangeThis(Str name, Obj? newVal)

Callback on instance itself when a slot is modified. Value is null if slot removed.

virtual Void onExecute(CompContext cx)

Callback to recompute component state.

virtual Duration? onExecuteFreq()

How often should this component have its onExecute callback invoked. Return null if this component has no time based computation.

virtual Comp? parent()

Parent component or null if root/unmounted

This remove(Str name)

Remove a slot by name. Do nothing is name isn't mapped.

@Operator
This set(Str name, Obj? val)

Set a slot by name. If val is null, then this is a convenience for remove.

Spec spec()

Xeto type for this component

virtual override Str toStr()

Return debug string

override Obj? trap(Str name, Obj?[]? args := null)

Get or set the slot mapped by the given name.