我正在尝试绘制一个简单的 gui,用户在其中添加数据,然后按下按钮,它会在窗口中绘制形状。我在更大的计划上失败了,所以我回到了第一方。我只是想创建一个简单的窗口,在菜单栏中有一个“绘图”按钮。当您按下按钮时,我已经硬编码到从实现图形类的 JPanel 派生的类中的形状应该出现在同一个窗口中。
这是我所拥有的,但它不起作用。有人可以看看我做错了什么。令人沮丧的是,当我只是在构造函数中创建形状并将其添加到布局中时,它可以正常工作,但是当我尝试使用按钮执行操作时,它会失败。
谢谢。
公共类 ShapeGUITest 扩展 JFrame {
public static final int WINDOW_WIDTH = 500;
public static final int WINDOW_HEIGHT = 500;
public static final int X = 100;
public static final int Y = 75;
public static final int SHAPE_BASE = 200;
public static final int SHAPE_HEIGHT = 250;
JPanel buttonPanel;
JComponent shapeArea;
public ShapeGUITest() {
super("Draw Shapes Dammit!");
setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
shapeArea = new Jpanel();
add(shapeArea, BorderLayout.CENTER);
JButton drawButton = new JButton("Draw");
drawButton.addActionListener(new DrawButtonListener());
JMenuBar bar = new JMenuBar();
bar.add(drawButton);
setJMenuBar(bar);
}
/*public void drawShapePanel() {
shapeArea = new ShapePanel();
add(shapeArea, BorderLayout.CENTER);
}*/
private class DrawButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
//drawShapePanel();
//shapeArea = new ShapePanel();
//add(shapeArea, BorderLayout.CENTER);
ShapePanel s = new ShapePanel();
//s.setVisible(true);
//shapeArea.removeAll();
shapeArea.add(s);
shapeArea.revalidate();
validate();
//ShapeFrame s = new ShapeFrame();
}
}
private class ShapeFrame extends JFrame {
public ShapeFrame() {
super("the shape is here");
setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void paint(Graphics g) {
super.paint(g);
setBackground(Color.WHITE);
g.setColor(Color.YELLOW);
g.fillRect(X, Y, SHAPE_BASE, SHAPE_HEIGHT);
g.setColor(Color.GREEN);
g.drawRect(X, Y, SHAPE_BASE, SHAPE_HEIGHT);
}
}
private class ShapePanel extends JPanel {
public ShapePanel() {
super();
setVisible(true);
setLayout(new FlowLayout());
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
setBackground(Color.WHITE);
g.setColor(Color.YELLOW);
g.fillRect(X, Y, SHAPE_BASE, SHAPE_HEIGHT);
g.setColor(Color.GREEN);
g.drawRect(X, Y, SHAPE_BASE, SHAPE_HEIGHT);
}
}
public static void main(String[] args) {
ShapeGUITest gui = new ShapeGUITest();
gui.setVisible(true);
}
}