在 JavaFX 应用程序中更改光标以进行长时间操作
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Changing cursor in JavaFX application for long operations
提问by Nik?a Baldun
I would like to change the cursor to Cursor.WAIT when executing potentially long operations in JavaFX application. I thought that Platform.runLater will help me:
在 JavaFX 应用程序中执行潜在的长操作时，我想将光标更改为 Cursor.WAIT。我认为 Platform.runLater 会帮助我：
this.getStage().getScene().setCursor(Cursor.WAIT);
Platform.runLater(new Runnable() {
@Override
public void run() {
// Do some stuff
getStage().getScene().setCursor(Cursor.DEFAULT);
}
});
But cursor does not change. Why doesn't this work?
但光标不会改变。为什么这不起作用？
采纳答案by jewelsea
Assuming you are running the following code off of the JavaFX Application thread, a pattern for displaying a wait cursor could be:
假设您从 JavaFX 应用程序线程运行以下代码，显示等待光标的模式可能是：
Platform.runLater(new Runnable() {
@Override
public void run() {
getStage().getScene().setCursor(Cursor.WAIT);
}
});
// Do some stuff
Platform.runLater(new Runnable() {
@Override
public void run() {
getStage().getScene().setCursor(Cursor.DEFAULT);
}
});
Or, if you are already on the JavaFX application thread, you could use a Service:
或者，如果您已经在 JavaFX 应用程序线程上，则可以使用Service：
import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.concurrent.*;
import javafx.event.*;
import javafx.geometry.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class ServiceWithCursorControl extends Application {
private final Button runButton = new Button("Run");
private final Label label = new Label();
private final Service service = new Service() {
@Override
protected Task createTask() {
return new Task<Void>() {
@Override protected Void call() throws Exception {
// do stuff
Thread.sleep(5000);
return null;
}
};
}
};
@Override public void start(Stage stage) {
VBox layout = createLayout();
Scene scene = new Scene(layout, 100, 80);
stage.setScene(scene);
bindUIandService(stage);
stage.show();
}
private void bindUIandService(Stage stage) {
label.textProperty()
.bind(
service.stateProperty().asString()
);
stage.getScene()
.getRoot()
.cursorProperty()
.bind(
Bindings
.when(service.runningProperty())
.then(Cursor.WAIT)
.otherwise(Cursor.DEFAULT)
);
runButton
.disableProperty()
.bind(
service.runningProperty()
);
runButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
service.restart();
}
});
}
private VBox createLayout() {
VBox layout = new VBox(10);
layout.getChildren().setAll(runButton, label);
layout.setPadding(new Insets(10));
layout.setAlignment(Pos.CENTER);
return layout;
}
public static void main(String[] args) {
launch(args);
}
}
It's unclear from your description which approach fits your problem best, but hopefully you can work it out.
从您的描述中不清楚哪种方法最适合您的问题，但希望您能解决。
