我正在使用java 8
将以下代码与javaFx
一起使用。
import javafx.application.Application;
import javafx.event.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.scene.web.*;
import javafx.stage.Stage;
@SuppressWarnings("all")
public class Highlighter extends Application {
private boolean marked;
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) {
final WebView webView = new WebView();
final WebEngine engine = webView.getEngine();
engine.load("http://johannburkard.de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html");
final TextField searchField = new TextField("light");
searchField.setPromptText("Enter the text you would like to highlight and press ENTER to highlight");
searchField.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent actionEvent) {
if (engine.getDocument() != null) {
highlight(
engine,
searchField.getText()
);
}
}
});
final Button highlightButton = new Button("Highlight");
highlightButton.setDefaultButton(true);
highlightButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent actionEvent) {
searchField.fireEvent(new ActionEvent());
}
});
final Button markedButton = new Button("Mark it");
markedButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent actionEvent) {
marked = true;
}
});
markedButton.setCancelButton(true);
HBox controls = new HBox(10);
controls.getChildren().setAll(
highlightButton,
markedButton
);
VBox layout = new VBox(10);
layout.getChildren().setAll(searchField, controls, webView);
searchField.setMinHeight(Control.USE_PREF_SIZE);
controls.setMinHeight(Control.USE_PREF_SIZE);
controls.disableProperty().bind(webView.getEngine().getLoadWorker().runningProperty());
searchField.disableProperty().bind(webView.getEngine().getLoadWorker().runningProperty());
primaryStage.setScene(new Scene(layout));
primaryStage.show();
webView.requestFocus();
}
private void highlight(WebEngine engine, String text) {
engine.executeScript("$('body').removeHighlight().highlight('" + text + "')");
}
}
我的问题是我想添加显示页面
marked status
的标签。我尝试仅将
Label label = new Label("Marked: " + marked)
添加到controls
,但这不起作用。关于如何在代码中添加标签以显示
marked status
的任何建议?感谢您的答复!
最佳答案
如果使用实际代码向控件添加Label
:
private boolean marked;
Label label = new Label("Marked: " + marked)
controls.getChildren().setAll(
highlightButton,
markedButton,
label
);
无论之后是否更改
Marked: false
,它将始终显示marked
。如果希望控件响应更改,则JavaFX具有可观察的属性,您可以阅读here。
因此,您可以使用以下包装布尔值的属性来替换布尔基元:
private final BooleanProperty marked=new SimpleBooleanProperty();
创建标签:
Label label=new Label("Marked: "+marked.get());
HBox controls = new HBox(10);
controls.setAlignment(Pos.CENTER_LEFT);
controls.getChildren().setAll(
highlightButton,
markedButton,
label
);
更改
markedButton
的事件: markedButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent actionEvent) {
marked.set(true);
}
});
(这只会工作一次,因为到目前为止您还没有实现将
marked
再次重置为false的方法)最后,为
marked
属性中的任何更改添加一个侦听器: marked.addListener(new ChangeListener<Boolean>() {
@Override
public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
label.setText("Marked: "+newValue);
}
});
除了监听器,您还可以使用
Bindings
:Label label=new Label();
label.textProperty().bind(Bindings.concat("Marked: ").concat(marked));