Question

我没有任何代码可以显示我将JLabel添加到JPanel的问题，并且在鼠标移动时将文本设置为鼠标的当前x / y位置。

如果有人能解释为什么会这样，我会很感激。

PComponent.java

public class PComponent extends JPanel implements Commons {

private static final long serialVersionUID = -5525789712337277886L;

public PComponent(int x, int y, int width, int height) {
    this.setLocation(x, y);
    this.setSize(width, height);
}
}

PNode

public class PNode extends PComponent {

public PNode(int x, int y, int width, int height) {
    super(x, y, width, height);
    this.setOpaque(false);
    this.setBorder(BorderFactory.createLineBorder(Color.RED));
}

}

PInterface

public abstract class PInterface extends PComponent implements Resizable {

public PInterface(int x, int y, int width, int height, int nodeW, int nodeH) {
    super(x, y, width, height);
    this.nodeW = nodeW;
    this.nodeH = nodeH;
    this.node = new PNode[MAX_NODES];
    this.addNodes();
    this.registerInterface();
    this.pack();
}

private void registerInterface() {
    for (int i = 0; i < cachedInterface.length; i++) {
        if(cachedInterface[i] == null) {
            cachedInterface[i] = this;
            break;
        }
    }
}

private void addNodes() {
    int index = 0;
    for (int i = 0; i < this.getWidth(); i+=nodeW) {
        for (int j = 0; j < this.getHeight(); j+=nodeH) {
            PNode node = new PNode(i,j,nodeW,nodeH);
            this.add(node);
            this.node[index] = node;
            index++;
        }
    }

}

public void writeToNode(String s, int index) {
    if(node[index] != null) {
        if(node[index].getComponent(0) instanceof JLabel) {
            ((JLabel) node[index].getComponent(0)).setText(s);
        }
    }
}

public void writeToNode(String s, int index, int child) {
    if(node[index] != null) {
        if(node[index].getComponent(child) instanceof JLabel) {
            ((JLabel) node[index].getComponent(child)).setText(s);
        }
    }
}

@Override
public void resize() {
}

protected abstract void pack();

protected void createTransparentInterface(int r, int g, int b, int o) {
    this.setBackground(new Color(r, g, b, o));
}

public static PInterface[] getCachedInterfaces() {
    return cachedInterface;
}

public int getNodeW() {
    return nodeW;
}

public void setNodeW(int nodeW) {
    this.nodeW = nodeW;
}

public int getNodeH() {
    return nodeH;
}

public void setNodeH(int nodeH) {
    this.nodeH = nodeH;
}

private static PInterface[] cachedInterface = new PInterface[MAX_INTERFACES];

protected int nodeW;
protected int nodeH;
protected PNode[] node;
}

ClientDetailsInterface

public class ClientDetailsInterface extends PInterface {

public ClientDetailsInterface() {
    super(0, 0, 200, 100, 100, 50);
    this.createTransparentInterface(255, 0, 0, 100);
}

@Override
protected void pack() {
    this.node[0].add(new JLabel("X:"));
    this.node[0].add(new JLabel("Y:"));
}

}

帆布

公共类Canvas扩展JPanel实现Resizable，Commons，MouseMotionListener {

private static final long serialVersionUID = 8374256772293662258L;

public Canvas() {
    this.setBackground(Color.WHITE);
    this.setFocusable(true);
    this.addMouseMotionListener(this);
    this.registerInterfaces();
}

private void registerInterfaces() {
    int count = 0;
    new ClientDetailsInterface();
    for (int i = 0; i < PInterface.getCachedInterfaces().length; i++) {
        if (PInterface.getCachedInterfaces()[i] != null) {
            this.add(PInterface.getCachedInterfaces()[i]);
            count++;
        }
    }
    System.out.println("Loaded: " + count + " interfaces!");
}

@Override
public void resize() {
    // TODO add resizing code
}

@Override
public void mouseDragged(MouseEvent arg0) {
}

@Override
public void mouseMoved(MouseEvent mouse) {
    PInterface.getCachedInterfaces()[0].writeToNode("X:" + mouse.getX(), 0,0);
    PInterface.getCachedInterfaces()[0].writeToNode("Y:" + mouse.getY(), 0,1);
}
}

新截图 http://prntscr.com/6dp6rd

Answer 1

听起来你正在某处做自定义绘画而你忘了调用：

super.paintComponent(g);

确保在进行自定义绘画之前清除背景。

这当然假设您重写了paintComponent()方法。如果你压倒油漆（...），不要。通过覆盖paintComponent（...）方法来完成自定义绘制。

如果您需要更多帮助，请发布SSCCE，因为您的代码存在问题我们无法通过图片告诉您代码的样子。

编辑：

请勿覆盖getX()和getY()。这些是用于在特定位置绘制组件的组件类的方法。

最终编辑：

请查看问题和解决方案Backgrounds With Transparency。

设置文本时复制JLabel

1 个答案: