Question

我遇到了问题我无法修复它... 如果你能看一下这个，我将不胜感激。

问题是，按下按钮后，JPanel中没有任何操作。看看这个：

这是我调用按钮的代码（铅笔，画笔等）：

    if(action.getSource() == newDrawingArea) { drawingArea = new Drawing(); }
    if(action.getSource() == pencilButton) { Drawing.pencil = new Pencil(drawingArea); pencil_condition = true; 
    lines_condition = false; paintbrush_condition = false; Drawing.paintbrush = null; Drawing.lines = null; }
    if(action.getSource() == linesButton) { Drawing.lines = new Lines(drawingArea); lines_condition = true; 
    pencil_condition = false;  paintbrush_condition = false; Drawing.paintbrush = null; Drawing.pencil = null; }
    if(action.getSource() == paintbrushButton) { Drawing.paintbrush = new Paintbrush(drawingArea); paintbrush_condition = true;
    lines_condition = false; pencil_condition = false; Drawing.lines = null; Drawing.pencil = null; }

Objects应该创建的类是：

public class Drawing extends JPanel {

    public static Pencil pencil;
    public static Lines lines;
    public static Paintbrush paintbrush;

    public Drawing() {
        setBackground(Color.WHITE);
        pencil = new Pencil(this);
        GUI.pencil_condition = true;

        addMouseListener(pencil);
        addMouseMotionListener(pencil);
        addMouseListener(lines);
        addMouseMotionListener(lines);
        addMouseListener(paintbrush);
        addMouseMotionListener(paintbrush);
        this.repaint();
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        if(GUI.pencil_condition == true) {
            GUI.lines_condition = false; GUI.paintbrush_condition = false; paintbrush = null; lines = null;
        pencil.paintComponent(g);
        }
        if(GUI.lines_condition == true) {
            System.out.println("include lines!");
            GUI.pencil_condition = false;  GUI.paintbrush_condition = false; paintbrush = null; pencil = null;
            lines.paintComponent(g);
        }
        if(GUI.paintbrush_condition == true)
        paintbrush.paintComponent(g);
    }
}

正如您所看到的，我添加了布尔类型条件，但它无法正常工作。在调用例如Pencil之后，它还将从之前的“绘图”中清除JPanel。

感谢您的帮助！

编辑：// 我编辑了一下代码，但它仍然不起作用......

如何解决这个问题？

编辑：//有人帮忙吗？：}

JButtons与JPanel连接[...]

0 个答案: