JavaFX学习之样例5
该代码主要是timeline和进度条使用
import javafx.animation.*;import javafx.application.Application;import javafx.beans.property.*;import javafx.beans.value.*;import javafx.event.*;import javafx.geometry.Pos;import javafx.scene.Scene;import javafx.scene.control.*;import javafx.scene.layout.*;import javafx.scene.text.Text;import javafx.stage.Stage;import javafx.util.Duration;public class LabeledProgressBarSample extends Application { public static void main(String[] args) { launch(args); } @Override public void start(final Stage stage) { stage.setScene(new Scene(createResettableProgressIndicatorBar())); stage.show(); } private VBox createResettableProgressIndicatorBar() { final int TOTAL_WORK = 18; final String WORK_DONE_LABEL_FORMAT = "%.0f"; final ReadOnlyDoubleWrapper workDone = new ReadOnlyDoubleWrapper(); final ProgressIndicatorBar bar = new ProgressIndicatorBar( workDone.getReadOnlyProperty(), TOTAL_WORK, WORK_DONE_LABEL_FORMAT ); final Timeline countDown = new Timeline( new KeyFrame(Duration.seconds(0), new KeyValue(workDone, TOTAL_WORK)), //初始化workDone等于total，也就是进度条满的 new KeyFrame(Duration.seconds(10), new KeyValue(workDone, 0)) //10秒内把workDone减到0。 ); countDown.play(); final Button resetButton = new Button("Reset"); resetButton.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent actionEvent) { countDown.playFromStart(); //重新开始 } }); final VBox layout = new VBox(20); layout.setAlignment(Pos.CENTER); layout.setStyle("-fx-background-color: cornsilk; -fx-padding: 20px;"); layout.getChildren().addAll(bar, resetButton); return layout; }}class ProgressIndicatorBar extends StackPane { final private ReadOnlyDoubleProperty workDone; final private double totalWork; final private ProgressBar bar = new ProgressBar(); final private Text text = new Text(); final private String labelFormatSpecifier; final private static int DEFAULT_LABEL_PADDING = 5; ProgressIndicatorBar(final ReadOnlyDoubleProperty workDone, final double totalWork, final String labelFormatSpecifier) { this.workDone = workDone; this.totalWork = totalWork; this.labelFormatSpecifier = labelFormatSpecifier; syncProgress(); //监听workDone的变化，从而更新text和progress workDone.addListener(new ChangeListener<Number>() { @Override public void changed(ObservableValue<? extends Number> observableValue, Number number, Number number2) { syncProgress(); } }); bar.setMaxWidth(Double.MAX_VALUE); // allows the progress bar to expand to fill available horizontal space. getChildren().setAll(bar, text); } // synchronizes the progress indicated with the work done. private void syncProgress() { if (workDone == null || totalWork == 0) { text.setText(""); bar.setProgress(ProgressBar.INDETERMINATE_PROGRESS); } else { text.setText(String.format(labelFormatSpecifier, Math.ceil(workDone.get()))); //更新text bar.setProgress(workDone.get() / totalWork); //更新进度条 } bar.setMinHeight(text.getBoundsInLocal().getHeight() + DEFAULT_LABEL_PADDING * 2); bar.setMinWidth (text.getBoundsInLocal().getWidth() + DEFAULT_LABEL_PADDING * 2); }}