带有进度栏的组合框无法正常工作 [英] Combobox with Progress bars is not working properly
本文介绍了带有进度栏的组合框无法正常工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个带有进度条的组合框示例.
I have this example of a combobox with progress bars.
package javafxapplication4;
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.control.ProgressBar;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Callback;
public class JavaFXApplication4 extends Application
{
@Override
public void start(Stage primaryStage)
{
double y1 = 15;
ProgressBar p1 = new ProgressBar();
p1.setLayoutY(y1);
VBox vb1 = new VBox();
vb1.getChildren().addAll(new Label("Progressbar 1"), p1);
double y2 = 15;
ProgressBar p2 = new ProgressBar();
p2.setLayoutY(y2);
VBox vb2 = new VBox();
vb2.getChildren().addAll(new Label("Progressbar 2"), p2);
double y3 = 15;
ProgressBar p3 = new ProgressBar();
p3.setLayoutY(y3);
VBox vb3 = new VBox();
vb3.getChildren().addAll(new Label("Progressbar 3"), p3);
TextChooser textChooser = new TextChooser(
vb1, vb2, vb3
);
textChooser.setStyle("-fx-font: 10px \"Verdana\";");
StackPane root = new StackPane();
root.getChildren().add(textChooser);
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
public static class TextChooser extends StackPane {
private Label label = new Label();
private ComboBox<VBox> combo = new ComboBox<>();
public TextChooser(VBox... options) {
StackPane.setAlignment(label, Pos.CENTER_LEFT);
StackPane.setAlignment(combo, Pos.CENTER_LEFT);
label.graphicProperty().bind(
//combo.getSelectionModel().selectedItemProperty()
combo.getSelectionModel().selectedItemProperty()
);
label.visibleProperty().bind(
combo.visibleProperty().not()
);
//label.setPadding(new Insets(0, 0, 0, 10));
combo.getItems().setAll(options);
combo.setCellFactory(new Callback<ListView<VBox>, ListCell<VBox>>() {
@Override public ListCell<VBox> call(ListView<VBox> p) {
return new ListCell<VBox>() {
@Override protected void updateItem(VBox item, boolean empty) {
super.updateItem(item, empty);
if (item == null || empty) {
setGraphic(null);
} else {
setGraphic(item);
}
}
};
}
});
combo.getSelectionModel().select(0);
combo.setVisible(true);
label.setOnMouseEntered(event -> combo.setVisible(true));
combo.showingProperty().addListener(observable -> {
if (!combo.isShowing()) {
combo.setVisible(false);
}
});
combo.setOnMouseExited(event -> {
if (!combo.isShowing()) {
combo.setVisible(false);
}
});
getChildren().setAll(label, combo);
}
public static void main(String[] args)
{
launch(args);
}
}
}
我想在应用程序运行时显示带有正在运行的后台进程的进度条.当我将鼠标移到进度条上时，我想查看所有进程.但是由于某些原因，代码无法正常工作-当我选择进度条时，没有进度条显示.您能帮我弄清楚这段代码吗?
I want to display a progress bar with the working background processes when the application is working. When I move the mouse over the progress bar I want to see all processes. But for some reason the code is not working properly - there is no progress bar displayed when I select progress bar. Can you help me fox this code.
推荐答案
如此处发布 https://stackoverflow.com/a/20630806/3110608
public class JavaFXApplication5 extends Application
{
public static void main( String[] args )
{
launch( args );
}
public class ProgressData
{
private final DoubleProperty progressProp = new SimpleDoubleProperty();
private final StringProperty progressName = new SimpleStringProperty();
public ProgressData( String name, double progress )
{
progressProp.set( progress );
progressName.set( name );
}
public DoubleProperty progressProperty()
{
return progressProp;
}
public StringProperty nameProperty()
{
return progressName;
}
@Override
// Lazy hack for the combo button.
public String toString()
{
return progressName.get();
}
}
@Override
public void start( Stage primaryStage )
{
ProgressData vb1 = new ProgressData( "Progressbar 1", -1 );
ProgressData vb2 = new ProgressData( "Progressbar 2", 0.2 );
ProgressData vb3 = new ProgressData( "Progressbar 3", 0.3 );
TextChooser textChooser = new TextChooser( vb1, vb2, vb3 );
textChooser.setStyle( "-fx-font: 10px \"Verdana\";" );
StackPane root = new StackPane();
root.getChildren().add( textChooser );
Scene scene = new Scene( root, 300, 250 );
primaryStage.setTitle( "Hello World!" );
primaryStage.setScene( scene );
primaryStage.show();
}
public static class TextChooser extends StackPane
{
private final Label label = new Label();
private final ComboBox<ProgressData> combo = new ComboBox<>();
public TextChooser(ProgressData... options)
{
StackPane.setAlignment( label, Pos.CENTER_LEFT );
StackPane.setAlignment( combo, Pos.CENTER_LEFT );
final ProgressBar labelBar = new ProgressBar();
label.visibleProperty().bind( combo.visibleProperty().not() );
label.setContentDisplay( ContentDisplay.RIGHT );
label.setGraphic( labelBar );
combo.getItems().setAll( options );
// This will change the label's text and the progress bar value.
combo.getSelectionModel().selectedItemProperty().addListener( new ChangeListener<ProgressData>()
{
@Override
public void changed( ObservableValue<? extends ProgressData> observable, ProgressData oldValue, ProgressData newValue )
{
if ( labelBar.progressProperty().isBound() )
{
labelBar.progressProperty().unbind();
}
labelBar.progressProperty().bind( newValue.progressProperty() );
label.setText( newValue.nameProperty().get() );
}
} );
combo.setCellFactory( new Callback<ListView<ProgressData>, ListCell<ProgressData>>()
{
@Override
public ListCell<ProgressData> call( ListView<ProgressData> p )
{
return new ListCell<ProgressData>()
{
private final ProgressBar cellBar = new ProgressBar();
{
cellBar.setMouseTransparent( true );
setContentDisplay( ContentDisplay.RIGHT );
setGraphic( cellBar );
}
@Override
protected void updateItem( ProgressData item, boolean empty )
{
super.updateItem( item, empty );
if ( item != null && ! empty )
{
if ( cellBar.progressProperty().isBound() )
{
cellBar.progressProperty().unbind();
}
cellBar.progressProperty().bind( item.progressProperty() );
setText( item.nameProperty().get() );
}
}
};
}
} );
combo.getSelectionModel().select( 0 );
combo.setVisible( true );
label.setOnMouseEntered( new EventHandler<MouseEvent>()
{
@Override
public void handle( MouseEvent event )
{
combo.setVisible( true );
}
} );
combo.showingProperty().addListener( new InvalidationListener()
{
@Override
public void invalidated( Observable observable )
{
if ( !combo.isShowing() )
{
combo.setVisible( false );
}
}
} );
combo.setOnMouseExited( new EventHandler<MouseEvent>()
{
@Override
public void handle( MouseEvent event )
{
if ( !combo.isShowing() )
{
combo.setVisible( false );
}
}
} );
getChildren().setAll( label, combo );
}
}
}
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