最小的JavaFX演示文稿（在JavaFX中）

如果您想进行有关JavaFX的演示，那么使用JavaFX本身进行演示非常方便。这样，您无需离开演示文稿就可以轻松显示示例。这是一个非常简单的示例。在NetBeans中，设置一个新的JavaFX项目“ New Project”->“ JavaFX”->“ JavaFX Application”，并将其命名为“ FXPresenter”。现在创建Slide类。它用于加载FXML文件：

package fxpresenter;import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.layout.AnchorPane;public class Slide extends AnchorPane implements Initializable {public Slide(String slide) {FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource(slide));fxmlLoader.setRoot(this);fxmlLoader.setController(this);try {fxmlLoader.load();} catch (IOException exception) {throw new RuntimeException(exception);}}@Overridepublic void initialize(URL url, ResourceBundle rb) {}
}

接下来，我们需要一个演示文稿，其中包含幻灯片和它们之间的切换：

package fxpresenter;import java.util.ArrayList;
import java.util.List;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.stage.Screen;public class Presentation extends Group {private List<Slide> slides;private int index;private Slide current;public EventHandler<KeyEvent> keyEventHandler;public Presentation() {this.slides = new ArrayList<>();keyEventHandler = new EventHandler<KeyEvent>() {public void handle(final KeyEvent keyEvent) {if (keyEvent.getCode() == KeyCode.LEFT) {previousSlidePlease();} else if (keyEvent.getCode() == KeyCode.RIGHT) {nextSlidePlease();}}};}public void addSlide(Slide slide) {addSlide(slides.size(), slide);}public void addSlide(int index, Slide slide) {slides.add(index, slide);}public void previousSlidePlease() {if (index > 0) {index--;}setSlide(index);}public void nextSlidePlease() {if (index < slides.size() - 1) {index++;}setSlide(index);}public void setSlide(int index) {if (current != null) {getChildren().remove(current);current.removeEventHandler(KeyEvent.KEY_PRESSED, keyEventHandler);}current = slides.get(index);current.addEventHandler(KeyEvent.KEY_PRESSED, keyEventHandler);scaleToFit();getChildren().add(slides.get(index));current.requestFocus();}void start() {index = -1;nextSlidePlease();}private void scaleToFit() {javafx.geometry.Rectangle2D screenBounds = Screen.getPrimary().getBounds();double prefWidth = current.getPrefWidth();double prefHeight = current.getPrefHeight();double scaleX = screenBounds.getWidth() / prefWidth;double scaleY = screenBounds.getHeight() / prefHeight;double centerX = (screenBounds.getWidth() / 2) - (prefWidth / 2);double centerY = (screenBounds.getHeight() / 2) - (prefHeight / 2);setTranslateX(centerX);setTranslateY(centerY);setScaleX(scaleX);setScaleY(scaleY);}
}

代码的作用应该非常明显：如果设置了一张幻灯片，它将按比例缩放以适合屏幕，并且它将监听关键事件。按向右箭头可移至下一张幻灯片，而向右箭头键则是上一张幻灯片。最后，我们需要一个应用程序以全屏显示所有内容：

package fxpresenter;import java.util.List;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Screen;
import javafx.stage.Stage;public class FXPresenter extends Application {@Overridepublic void start(Stage stage) throws Exception {final Presentation presentation = new Presentation();presentation.addSlide(new Slide('Slide1.fxml'));presentation.addSlide(new Slide('Slide2.fxml'));final Scene scene = new Scene(presentation);stage.setScene(scene);stage.setFullScreen(true);presentation.start();List<Screen> screens = Screen.getScreens();stage.show();}public static void main(String[] args) {launch(args);}}

你完成了。现在，您可以继续创建幻灯片了。对于该示例，创建两个名为“ Slide1.fxml”和“ Slide2.fxml”的新FXML文件，并使用SceneBuilder对其进行样式设置，您便可以使用了。这是一个小视频，展示了如何使用SceneBuilder创建幻灯片：

参考：在Eppleton博客上，我们的JCG合作伙伴 Toni Epple提供了一个最小的JavaFX演示文稿（在JavaFX中）。