How to center a node within a pane javafx

问题

How do I create a Pane and have a child Node put at the center?

Lets say the Pane is 500 by 500 and the Node is an ImageView with a 200 by 200 Image

ImageView view = new ImageView();

Image img = new Image("test.png");
view.setImage(img);
Pane pane = new Pane();
pane.setMinWidth(500);
pane.setMinHeight(500);
pane.getChildren().add(view);

回答1:

you have 2 choices :

For example using StackPane instead of Pane (because you can use Pos)

StackPane p = new StackPane();
p.setPrefSize(700,700); //set a default size for your stackpane
Image img = new Image("test.png"); //create an image
ImageView v = new ImageView(img); //create an imageView and pass the image 

p.getChildren().add(v); //add imageView to stackPane
StackPane.setAlignment(v,Pos.CENTER_LEFT); //set it to the Center Left(by default it's on the center)
stage.setScene(new Scene(p));
stage.show();

You can use JavaFx Scene Builder, it's a visual layout tool for JavaFx. For example if I want to create a Hbox layout:

<?xml version="1.0" encoding="UTF-8"?>

    <?import java.lang.*?>
    <?import java.net.*?>
    <?import java.util.*?>
    <?import javafx.geometry.*?>
    <?import javafx.scene.*?>
    <?import javafx.scene.control.*?>
    <?import javafx.scene.effect.*?>
    <?import javafx.scene.image.*?>
    <?import javafx.scene.layout.*?>
    <?import javafx.scene.shape.*?>
    <?import javafx.scene.text.*?>

    <HBox alignment="CENTER" prefHeight="369.0" prefWidth="425.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/2.2" >
        <children>
            <ImageView fitHeight="150.0" fitWidth="200.0" pickOnBounds="true" preserveRatio="true" x="0.0" HBox.hgrow="NEVER">
                <image>
                    <Image url="@../yourImg.png" />
                </image>
            </ImageView>
        </children>
    </HBox>

save-it as myLayout.fxml inside your main class and add following to your code:

Hbox root = FXMLLoader.load(getClass().getResource("myLayout.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();

回答2:

I usually use the following approach to center a node/pane:

<VBox alignment="CENTER">
    <HBox alignment="CENTER">
        <!-- your node/pane -->
    </HBox>
</VBox>

来源：https://stackoverflow.com/questions/23576044/how-to-center-a-node-within-a-pane-javafx

标签

javafx

javafx-2

center

pane