[英]How to put a ProcessIndicator in each row of a TableView and indicate task status
我正在尝试在 JavaFX 中执行以下操作:
TableView
。Button
时,对于TableView
的每一行,应该执行一些任务,一行接一行。 (例如检查一些数据,...)ProgressIndicator
,直到该行的任务完成,然后指示器显示为已完成。我在这篇相关的 Stackoverflow 帖子和此处找到了一些帮助,并尝试根据需要进行调整,但遇到了一些问题:
ProgressIndicator
都会立即显示(不确定)。 一旦按下按钮,我怎样才能只激活它们/使它们逐行可见?我当前的可运行代码:
import java.util.Random;
import java.util.concurrent.*;
import javafx.application.Application;
import javafx.beans.property.ReadOnlyStringProperty;
import javafx.beans.property.ReadOnlyStringWrapper;
import javafx.beans.value.ObservableValue;
import javafx.concurrent.Task;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import javafx.util.Callback;
public class ProgressIndicatorTableCellTest extends Application {
public void start(Stage primaryStage) {
TableView<TestTask> table = new TableView<>();
Random rng = new Random();
for (int i = 0; i < 3; i++) {
table.getItems().add(new TestTask(rng.nextInt(3000) + 2000, "Test"));
}
TableColumn<TestTask, String> nameCol = new TableColumn("Name");
nameCol.setCellValueFactory(new PropertyValueFactory<TestTask, String>("name"));
nameCol.setPrefWidth(75);
TableColumn<TestTask, Double> progressCol = new TableColumn("Progress");
progressCol.setCellValueFactory(new PropertyValueFactory<TestTask, Double>("progress"));
progressCol.setCellFactory(ProgressIndicatorTableCell.<TestTask>forTableColumn());
table.getColumns().addAll(nameCol, progressCol);
BorderPane root = new BorderPane();
root.setCenter(table);
Button btn = new Button("Start");
btn.setOnAction(actionEvent -> {
ExecutorService executor = Executors.newSingleThreadExecutor();
for (TestTask task : table.getItems()) {
executor.submit(task);
}
});
root.setBottom(btn);
primaryStage.setScene(new Scene(root));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
public static class TestTask extends Task<Void> {
private final int waitTime; // milliseconds
final ReadOnlyStringWrapper name = new ReadOnlyStringWrapper();
public static final int NUM_ITERATIONS = 100;
public TestTask(int waitTime, String name) {
this.waitTime = waitTime;
this.name.set(name);
}
public ReadOnlyStringProperty nameProperty() {
return name.getReadOnlyProperty();
}
@Override
protected Void call() throws Exception {
this.updateProgress(ProgressIndicator.INDETERMINATE_PROGRESS, 1);
Thread.sleep(waitTime);
this.updateProgress(1, 1);
return null;
}
}
}
class ProgressIndicatorTableCell<S> extends TableCell<S, Double> {
public static <S> Callback<TableColumn<S, Double>, TableCell<S, Double>> forTableColumn() {
return new Callback<TableColumn<S, Double>, TableCell<S, Double>>() {
@Override
public TableCell<S, Double> call(TableColumn<S, Double> param) {
return new ProgressIndicatorTableCell<>();
}
};
}
private final ProgressIndicator progressIndicator;
private ObservableValue observable;
public ProgressIndicatorTableCell() {
this.progressIndicator = new ProgressIndicator();
setGraphic(progressIndicator);
}
@Override
public void updateItem(Double item, boolean empty) {
super.updateItem(item, empty);
if (empty) {
setGraphic(null);
} else {
progressIndicator.progressProperty().unbind();
observable = getTableColumn().getCellObservableValue(getIndex());
if (observable != null) {
progressIndicator.progressProperty().bind(observable);
} else {
progressIndicator.setProgress(item);
}
setGraphic(progressIndicator);
}
}
}
而现在的output:
这是实现您的第一个问题的版本。 有了这个要求,单元格只是任务的 state 中的一个 function。如果它是RUNNING
,显示一个不确定的进度指示器; 如果成功则显示值为 1 的SUCCEEDED
指示器; 否则,什么也不显示。
请注意,原始问题非常陈旧,并且使用了很多过时的代码 styles。我已相应更新。
import javafx.application.Application;
import javafx.beans.property.ReadOnlyStringProperty;
import javafx.beans.property.ReadOnlyStringWrapper;
import javafx.concurrent.Task;
import javafx.concurrent.Worker;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class ProgressIndicatorTableCellTest extends Application {
public void start(Stage primaryStage) {
TableView<TestTask> table = new TableView<>();
Random rng = new Random();
for (int i = 0; i < 3; i++) {
table.getItems().add(new TestTask(rng.nextInt(3000) + 2000, "Test"));
}
TableColumn<TestTask, String> nameCol = new TableColumn<>("Name");
nameCol.setCellValueFactory(data -> data.getValue().nameProperty());
nameCol.setPrefWidth(75);
TableColumn<TestTask, Worker.State> progressCol = new TableColumn<>("Progress");
progressCol.setCellValueFactory(data -> data.getValue().stateProperty());
progressCol.setCellFactory(col -> new ProgressIndicatorTableCell<>());
table.getColumns().addAll(nameCol, progressCol);
BorderPane root = new BorderPane();
root.setCenter(table);
Button btn = new Button("Start");
btn.setOnAction(actionEvent -> {
ExecutorService executor = Executors.newSingleThreadExecutor(r -> {
Thread t = new Thread(r);
t.setDaemon(true);
return t;
});
for (TestTask task : table.getItems()) {
executor.submit(task);
}
});
root.setBottom(btn);
primaryStage.setScene(new Scene(root));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
public static class TestTask extends Task<Void> {
private final int waitTime; // milliseconds
final ReadOnlyStringWrapper name = new ReadOnlyStringWrapper();
public static final int NUM_ITERATIONS = 100;
public TestTask(int waitTime, String name) {
this.waitTime = waitTime;
this.name.set(name);
}
public ReadOnlyStringProperty nameProperty() {
return name.getReadOnlyProperty();
}
@Override
protected Void call() throws Exception {
this.updateProgress(ProgressIndicator.INDETERMINATE_PROGRESS, 1);
Thread.sleep(waitTime);
this.updateProgress(1, 1);
return null;
}
}
}
class ProgressIndicatorTableCell<S> extends TableCell<S, Worker.State> {
private final ProgressIndicator progressIndicator = new ProgressIndicator();
@Override
protected void updateItem(Worker.State state, boolean empty) {
super.updateItem(state, empty);
if (state == Worker.State.SUCCEEDED) {
progressIndicator.setProgress(1);
setGraphic(progressIndicator);
} else if (state == Worker.State.RUNNING) {
progressIndicator.setProgress(-1);
setGraphic(progressIndicator);
} else {
setGraphic(null);
}
}
}
要允许“重新启动”,您应该使用Service
而不仅仅是Task
。 如果多次按下按钮,此版本将允许重新启动,在继续之前将所有内容返回到初始 state。
此版本还将处理工作从 model class 中分解出来,这对于将职责正确分配给类是可取的:
商品 java:
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.ReadOnlyStringProperty;
import javafx.beans.property.ReadOnlyStringWrapper;
import javafx.beans.property.SimpleObjectProperty;
public class Item {
public enum State {WAITING, PROCESSING, READY}
final ReadOnlyStringWrapper name = new ReadOnlyStringWrapper();
private final ObjectProperty<State> state = new SimpleObjectProperty<>(State.WAITING);
public Item(String name) {
this.name.set(name);
}
public ReadOnlyStringProperty nameProperty() {
return name.getReadOnlyProperty();
}
public State getState() {
return state.get();
}
public ObjectProperty<State> stateProperty() {
return state;
}
public void setState(State state) {
this.state.set(state);
}
}
进程管理器.java:
import javafx.application.Platform;
import javafx.concurrent.Service;
import javafx.concurrent.Task;
import java.util.List;
import java.util.Random;
public class ProcessManager {
private final List<Item> items;
private Random rng = new Random();
private Service<Void> service = new Service<>() {
@Override
protected Task<Void> createTask() {
return new Task<>() {
@Override
protected Void call() throws Exception {
for (Item task: items) {
try {
Platform.runLater(() -> task.setState(Item.State.PROCESSING));
Thread.sleep(2000 + rng.nextInt(3000));
Platform.runLater(() -> task.setState(Item.State.READY));
} catch (InterruptedException exc) {
Thread.currentThread().interrupt();
}
if (isCancelled()) {
Platform.runLater(() -> task.setState(Item.State.WAITING));
break;
}
}
return null;
}
};
}
};
public ProcessManager(List<Item> items) {
this.items = items ;
service.setOnCancelled(e -> items.forEach(task -> task.setState(Item.State.WAITING)));
}
public void process() {
service.restart();
}
}
和应用程序:
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
public class ProgressIndicatorTableCellTest extends Application {
public void start(Stage primaryStage) {
ObservableList<Item> tasks = FXCollections.observableArrayList();
ProcessManager processManager = new ProcessManager(tasks);
TableView<Item> table = new TableView<>();
for (int i = 0; i < 3; i++) {
Item task = new Item("Item " + (i + 1));
tasks.add(task);
}
table.setItems(tasks);
TableColumn<Item, String> nameCol = new TableColumn<>("Name");
nameCol.setCellValueFactory(data -> data.getValue().nameProperty());
nameCol.setPrefWidth(75);
TableColumn<Item, Item.State> progressCol = new TableColumn<>("Progress");
progressCol.setCellValueFactory(data -> data.getValue().stateProperty());
progressCol.setCellFactory(col -> new TableCell<>() {
private final ProgressIndicator indicator = new ProgressIndicator();
@Override
protected void updateItem(Item.State state, boolean empty) {
super.updateItem(state, empty);
if (state == Item.State.PROCESSING) {
indicator.setProgress(-1);
setGraphic(indicator);
} else if (state == Item.State.READY) {
indicator.setProgress(1);
setGraphic(indicator);
} else {
setGraphic(null);
}
}
});
table.getColumns().addAll(nameCol, progressCol);
BorderPane root = new BorderPane();
root.setCenter(table);
Button btn = new Button("Start");
btn.setOnAction(actionEvent -> processManager.process());
root.setBottom(btn);
primaryStage.setScene(new Scene(root));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
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