我会因为这个被打脸...
label.setLayout(new GridBagLayout());
GridBagConstraints gbc = GridBagConstraints();
gbc.insets = new Insets(4, 0, 4, 0);
gbc.gridwidth = GridBagConstraints.REMAINDER;
label.add(button, gbc);
// add the other buttons
更新
就个人而言,我会创建一个 custom JPanel
,它会绘制背景,然后使用GridBagLayout
上面的
更新
这个问题的问题是“取决于”
这取决于您希望如何实现实际按钮。因为您留下了“空白”空间,所以我假设您打算在图像上渲染一些按钮。我个人会渲染一个完整的图像,然后添加一些普通按钮,但这是你的项目,不是我的。
如果您想使用类似JButton
(或任何其他Component
)的东西,您将需要一个自定义布局管理器来帮助您将组件与您留下的间隙对齐。因此,我会简单地做一个漂亮的背景并使用类似的东西GridBagLayout
......
抱歉,我可能有点过火了,但我玩得很开心。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RadialGradientPaint;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class ButtonImage {
public static void main(String[] args) {
new ButtonImage();
}
public ButtonImage() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new MenuPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public static class MenuPane extends JPanel {
public static final Rectangle NEW_GAME_BOUNDS = new Rectangle(221, 157, 262, 85);
public static final Rectangle LOAD_GAME_BOUNDS = new Rectangle(221, 276, 262, 85);
public static final Rectangle EXIT_GAME_BOUNDS = new Rectangle(221, 396, 262, 85);
private BufferedImage img;
private Rectangle selectedBounds;
public MenuPane() {
try {
img = ImageIO.read(getClass().getResource("/vtr1a.jpg"));
} catch (IOException ex) {
ex.printStackTrace();
}
MouseAdapter mouseHandler = new MouseAdapter() {
@Override
public void mouseMoved(MouseEvent e) {
if (getNewGameBounds().contains(e.getPoint())) {
System.out.println("in new");
selectedBounds = getNewGameBounds();
} else if (getLoadGameBounds().contains(e.getPoint())) {
System.out.println("in load");
selectedBounds = getLoadGameBounds();
} else if (getExitGameBounds().contains(e.getPoint())) {
System.out.println("in exit");
selectedBounds = getExitGameBounds();
} else {
selectedBounds = null;
}
repaint();
}
@Override
public void mouseClicked(MouseEvent e) {
if (getNewGameBounds().contains(e.getPoint())) {
System.out.println("New Game");
} else if (getLoadGameBounds().contains(e.getPoint())) {
System.out.println("Load Game");
} else if (getExitGameBounds().contains(e.getPoint())) {
System.out.println("Exit Game");
}
}
};
addMouseListener(mouseHandler);
addMouseMotionListener(mouseHandler);
}
@Override
public Dimension getPreferredSize() {
return img == null ? super.getPreferredSize() : new Dimension(img.getWidth(), img.getHeight());
}
protected Point getImageOffset() {
Point p = new Point();
if (img != null) {
p.x = (getWidth() - img.getWidth()) / 2;
p.y = (getHeight() - img.getHeight()) / 2;
}
return p;
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (img != null) {
Graphics2D g2d = (Graphics2D) g.create();
Point p = getImageOffset();
g2d.drawImage(img, p.x, p.y, this);
drawText(g2d, "New Game", getNewGameBounds());
drawText(g2d, "Load Game", getLoadGameBounds());
drawText(g2d, "Exit Game", getExitGameBounds());
g2d.dispose();
}
}
protected void drawText(Graphics2D g2d, String text, Rectangle bounds) {
FontMetrics fm = g2d.getFontMetrics();
g2d.setColor(Color.GRAY);
if (selectedBounds != null) {
if (bounds.contains(selectedBounds)) {
RadialGradientPaint rpg = new RadialGradientPaint(
new Point(bounds.x + (bounds.width / 2), bounds.y + (bounds.height / 2)),
Math.min(bounds.width, bounds.height),
new float[]{0f, 1f},
new Color[]{new Color(252, 180, 42), new Color(97, 205, 181)}
);
g2d.setPaint(rpg);
RoundRectangle2D fill = new RoundRectangle2D.Float(bounds.x, bounds.y, bounds.width, bounds.height, 22, 22);
g2d.fill(fill);
g2d.setColor(Color.WHITE);
}
}
g2d.drawString(
text,
bounds.x + ((bounds.width - fm.stringWidth(text)) / 2),
bounds.y + ((bounds.height - fm.getHeight()) / 2) + fm.getAscent());
}
protected Rectangle getNewGameBounds() {
return getButtonBounds(NEW_GAME_BOUNDS);
}
protected Rectangle getLoadGameBounds() {
return getButtonBounds(LOAD_GAME_BOUNDS);
}
protected Rectangle getExitGameBounds() {
return getButtonBounds(EXIT_GAME_BOUNDS);
}
protected Rectangle getButtonBounds(Rectangle masterBounds) {
Rectangle bounds = new Rectangle(masterBounds);
Point p = getImageOffset();
bounds.translate(p.x, p.y);
return bounds;
}
}
}
您可以轻松地为每个按钮使用单独的图像,而不是渲染文本/图形,而是在所需位置渲染图像。
查看自定义绘画和2D 图形了解更多信息。