Question

我正在制作一个程序，涉及在屏幕上点击并拖动JLabel，这些屏幕上有连接它们的线条。一切正常。但是当我使用序列化添加保存/加载功能时，发生了奇怪的事情。现在当我加载文件时，它看起来就像我保存它时一样，但是如果我尝试拖动组件，附加的线不会保持笔直 - 它会被拖动JLabel的位置跟踪，并删除如果你把它拖回来。

这是我的“连接”的类（“输入”和“输出”是位于该行的端点的对象）：

class Connection extends JComponent {
    //Connections connect components together

    Output output;
    Input input;
    int id;
    public Connection(int ID, Output output, Input input) {
        id = ID;
        currentConnectionID++;
        allConnections.put(id, this);
        this.output = output;
        this.input = input;
        //if (output.isAvailable()) output.connections.add(this);
        //if (input.isAvailable()) input.connections.add(this);
    }
    public void paintConnection(Graphics2D g2d) {
        //super.paintComponent(g2d);
        Line2D.Double line = new Line2D.Double(output.getX(), output.getY(), input.getX(), input.getY());


        g2d.draw(line);
        //g2d.drawLine(output.getX(), output.getY(), input.getX(), input.getY());
        output.inputsReceivingThis.add(input); //Now the output "knows" where it's going
        if (mode.equals("choosingInput")) {
            input.component.numberConnected +=1;
        }


    }
}

这是我的保存和加载功能：

void save() throws IOException {
    String savepoint = "C:\\docs\\hi.txt";
    FileOutputStream fileOut = new FileOutputStream(savepoint);
    ObjectOutputStream out = new ObjectOutputStream(fileOut);
    System.out.println(lines.size());
    for (Component c : components) {
        for (Output o : c.outputs) {
            for (Input i : o.inputsReceivingThis) {
                System.out.println(i.component.type);
            }
        }
    }
    ProjectState state = new ProjectState();
    out.writeObject(state);
    out.close();
    fileOut.close();

}

void load() throws IOException, ClassNotFoundException {
    ProjectState state;
    String loadpoint = "C:\\docs\\hi.txt";
    FileInputStream fileIn = new FileInputStream(loadpoint);
    ObjectInputStream in = new ObjectInputStream(fileIn);
    state = (ProjectState) in.readObject();
    in.close();
    fileIn.close();
    drawPanel.removeAll();
    components.clear();
    lines.clear();
    components=state.projectComponents;
    for (Component component : state.projectComponents) {
        drawPanel.add(component);
        for (Output output : component.outputs) {
            for (Input input : output.inputsReceivingThis) {
                Connection c = new Connection(currentConnectionID, output, input);
                lines.add(c);
            }
        }
    }

    drawPanel.repaint();
}

编辑：对不起，我的问题不是很清楚...我想知道的是，为什么从保存文件加载然后拖动时，线条被绘制得不直，我怎么能直线？我想我也应该包含点击并拖动代码：

abstract class Component extends JLabel implements MouseListener, MouseMotionListener, Serializable {

public void mousePressed(MouseEvent e) { //the "click" of click-and-drag        

        startDragX = e.getX();
        startDragY = e.getY();
    }
public void mouseDragged(MouseEvent e) {
        int newX =  getX() + (e.getX() - startDragX);
        int newY = getY() + (e.getY() - startDragY);
        setLocation(newX, newY);
        inDrag = true;
        frame.repaint();
    }
}

Java：从saveFile加载时，行不直

0 个答案: