Java 鼠标悬停时背景图像更改的 JButton
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JButton with background Image changing on mouse hover
提问by Marius
I'm trying to display an JButton with an image on it, but I can't figure out how to get Mousehover work on this. The normal display of the image is working, tough. Also it would be nice, if the text drawn on the button could be centered.
我正在尝试显示一个带有图像的 JButton，但我不知道如何让鼠标悬停在这上面工作。图像的正常显示工作，艰难。如果按钮上绘制的文本可以居中，那就太好了。
import java.awt.*;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JFrame;
public class ImageButtonTest {
private static JButton imageButton;
public static void main(String[] args) throws IOException {
JFrame frm = new JFrame();
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setSize(90, 27);
frm.setLocation(50, 50);
Image image = ImageIO.read(new URL("http://i.imgur.com/bitgM6l.png"));
Image imageHover = ImageIO.read(new URL("http://i.imgur.com/dt81BWk.png"));
imageButton = new ImageButton(image, imageHover);
imageButton.setText("Download");
frm.add(imageButton);
frm.pack();
frm.setVisible(true);
}
static class ImageButton extends JButton {
private Image image, imageHover;
private boolean hover;
ImageButton(Image image, Image imageHover) {
this.image = image;
this.hover = false;
addMouseListener(new java.awt.event.MouseAdapter() {
@Override
public void mouseEntered(java.awt.event.MouseEvent evt) {
hover = true;
repaint();
}
@Override
public void mouseExited(java.awt.event.MouseEvent evt) {
hover = false;
repaint();
}
});
};
@Override
protected void paintComponent(Graphics g) {
if(isEnabled()) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2.setFont(new Font("Arial", Font.PLAIN, 12));
g2.setColor(Color.WHITE);
if(hover) {
g2.drawImage(imageHover, 0, 0, getWidth(), getHeight(), this);
} else {
g2.drawImage(image, 0, 0, getWidth(), getHeight(), this);
}
g2.drawString(getText(), 20, getHeight() / 2 + 5);
g2.dispose();
} else {
super.paintComponent(g);
}
}
}
}
采纳答案by mKorbel
Image image = ImageIO.read(new URL("http://i.imgur.com/bitgM6l.png")); Image imageHover = ImageIO.read(new URL("http://i.imgur.com/dt81BWk.png"));
Image image = ImageIO.read(new URL(" http://i.imgur.com/bitgM6l.png")); Image imageHover = ImageIO.read(new URL(" http://i.imgur.com/dt81BWk.png"));
you can to use standard methods implemented in
您可以使用在
//button.setBorderPainted(false);
//button.setBorder(null);
//button.setFocusable(false);
//button.setMargin(new Insets(0, 0, 0, 0));
button.setContentAreaFilled(false);
button.setIcon(icon());
button.setRolloverIcon(iconA());
button.setPressedIcon(iconB());
button.setDisabledIcon(iconC());
JButton.getModel().addChangeListener()
JButton.getModel().addChangeListener()
JButton.getModel().addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
ButtonModel model = (ButtonModel) e.getSource();
if (model.isRollover()) {
button.setIcon(icon());
} else {
button.setIcon(iconA());
} etc ...// if (model.isPressed()) {
}
});
