Question

我有一个JSplitPane，理想情况下应该像这样 -

左侧的JList应具有与右侧JLabel中显示的图片相对应的名称。

图片可以在项目根目录中的图像文件夹中找到。

无论出于何种原因，选择左侧JList中的项目不会影响右侧的JLabel。

public class TextureChooser {

static Main main;

JSplitPane splitPane;
JList textureList;
JLabel texturePic;
String[] textures = {"grass", "stone", "water"};
ImageIcon ic = new ImageIcon("/Users/seanweber/Desktop/Textures/stone.jpg");

public TextureChooser(){
    textureList = new JList(textures);
    texturePic = new JLabel(ic);
    splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, textureList, texturePic);
}

//Listens to the list
public void valueChanged(ListSelectionEvent e) {
    JList list = (JList)e.getSource();
    updateLabel(textures[list.getSelectedIndex()]);
}

//Renders the selected image
protected void updateLabel (String name) {
    ImageIcon icon = createImageIcon("images/" + name + ".png");
    texturePic.setIcon(icon);
    if  (icon != null) {
        texturePic.setText(null);
    } else {
        texturePic.setText("Image not found");
    }
}

/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path) {
   URL imgPath = main.getClass().getResource(path);
    if (imgPath != null) {
        return new ImageIcon(imgPath);
    } else {
        System.err.println("Couldn't find file: " + path);
        return null;
    }
}

images目录的路径如下所示。

- ProjectRoot
  - images
    - stone
    - grass
    - water

我最初的假设是我正在错误地检索图像......

大部分代码都是直接从Oracle网站here上的示例中获取的。

Answer 1

您尚未向ListSelectionListener ...

添加textureList

textureList.addListSelectionListener(new ListSelectionListener() {
    @Override
    public void valueChanged(ListSelectionEvent e) {
        JList list = (JList) e.getSource();
        updateLabel(textures[list.getSelectedIndex()]);
    }
});

选择时未加载图像

1 个答案: