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JavaFX: Add a few more utility functions for working with DataFeeds and the JavaFX UI thread.

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This commit is contained in:
Mike Hearn 2017-07-10 17:27:49 +02:00
parent 5229d9fda6
commit dcda0b078e
1 changed files with 40 additions and 0 deletions
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client/jfx/src/main/kotlin/net/corda/client/jfx/utils/ObservableUtilities.kt
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@ -1,5 +1,6 @@
package net.corda.client.jfx.utils package net.corda.client.jfx.utils
import javafx.application.Platform
import javafx.beans.binding.Bindings import javafx.beans.binding.Bindings
import javafx.beans.binding.BooleanBinding import javafx.beans.binding.BooleanBinding
import javafx.beans.property.ReadOnlyObjectWrapper import javafx.beans.property.ReadOnlyObjectWrapper
@ -10,7 +11,13 @@ import javafx.collections.MapChangeListener
import javafx.collections.ObservableList import javafx.collections.ObservableList
import javafx.collections.ObservableMap import javafx.collections.ObservableMap
import javafx.collections.transformation.FilteredList import javafx.collections.transformation.FilteredList
import net.corda.core.contracts.ContractState
import net.corda.core.contracts.StateAndRef
import net.corda.core.messaging.DataFeed
import net.corda.core.node.services.Vault
import org.fxmisc.easybind.EasyBind import org.fxmisc.easybind.EasyBind
import rx.Observable
import rx.schedulers.Schedulers
import java.util.function.Predicate import java.util.function.Predicate
/** /**
@ -313,3 +320,36 @@ fun <A> ObservableList<A>.firstOrDefault(default: ObservableValue<A?>, predicate
fun <A> ObservableList<A>.firstOrNullObservable(predicate: (A) -> Boolean): ObservableValue<A?> { fun <A> ObservableList<A>.firstOrNullObservable(predicate: (A) -> Boolean): ObservableValue<A?> {
return Bindings.createObjectBinding({ this.firstOrNull(predicate) }, arrayOf(this)) return Bindings.createObjectBinding({ this.firstOrNull(predicate) }, arrayOf(this))
} }
/**
* Modifies the given Rx observable such that emissions are run on the JavaFX GUI thread. Use this when you have an Rx
* observable that may emit in the background e.g. from the network and you wish to link it to the user interface.
*
* Note: you should use the returned observable, not the original one this method is called on.
*/
fun <T> Observable<T>.observeOnFXThread(): Observable<T> = observeOn(Schedulers.from(Platform::runLater))
/**
* Given a [DataFeed] that contains the results of a vault query and a subsequent stream of changes, returns a JavaFX
* [ObservableList] that mirrors the streamed results on the UI thread. Note that the paging is *not* respected by this
* function: if a state is added that would not have appeared in the page in the initial query, it will still be added
* to the observable list.
*
* @see toFXListOfStates if you want just the state objects and not the ledger pointers too.
*/
fun <T : ContractState> DataFeed<Vault.Page<T>, Vault.Update<T>>.toFXListOfStateRefs(): ObservableList<StateAndRef<T>> {
val list = FXCollections.observableArrayList(snapshot.states)
updates.observeOnFXThread().subscribe { (consumed, produced) ->
list.removeAll(consumed)
list.addAll(produced)
}
return list
}
/**
* Returns the same list as [toFXListOfStateRefs] but which contains the states instead of [StateAndRef] wrappers.
* The same notes apply as with that function.
*/
fun <T : ContractState> DataFeed<Vault.Page<T>, Vault.Update<T>>.toFXListOfStates(): ObservableList<T> {
return toFXListOfStateRefs().map { it.state.data }
}