[英]Transparent JTexfield with background image
我想知道如何在透明的情况下将图像设置为JTextField
,或者如何使我的JTextField
看起来像这样:
这是我使字段透明的方法,但是无法设置其背景图像:
//Step 1: Remove the border line to make it look like a flat surface.
field.setBorder(BorderFactory.createLineBorder(Color.white, 0));
//Step 2: Set the background color to null to remove the background.
field.setBackground(null);
所有Swing组件都具有透明性的概念,可通过使用opaque
属性对其进行控制。 将背景设置为null
帐篷,以将字段的背景颜色保留为其UI默认设置。
话虽如此,某些组件可以忽略此(部分或全部)。 在这种情况下,我们可以作弊...
在下面的示例中,通过opaque
属性将字段设置为透明,这很重要,因为RepaintManager
不会在组件后面绘制区域,除非它们是透明的,并使用完全透明的背景色。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TestTextField {
public static void main(String[] args) {
new TestTextField();
}
public TestTextField() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JTextField field = new JTextField(20);
field.setBackground(new Color(0, 0, 0, 0));
field.setOpaque(false);
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setBackground(Color.RED);
frame.setLayout(new GridBagLayout());
frame.add(field);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
根据评论进行了更新...
这是一个非常具体的示例,旨在为所提出的问题提供直接答案。 基本上,这是创建一个自定义边框并使用Image
渲染“边框”
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.AbstractBorder;
import javax.swing.border.Border;
import javax.swing.border.MatteBorder;
public class TestTextField {
public static void main(String[] args) {
new TestTextField();
}
public TestTextField() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JTextField field = new JTextField(20);
try {
BufferedImage img = ImageIO.read(getClass().getResource("/FieldBorder.png"));
field.setBorder(new ImageBorder(img, 8, 6));
} catch (IOException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridBagLayout());
frame.add(field);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class ImageBorder implements Border {
private BufferedImage img;
private int bottomMargin;
private int leftMargin;
public ImageBorder(BufferedImage img, int leftMargin, int bottomMargin) {
this.img = img;
this.bottomMargin = bottomMargin;
this.leftMargin = leftMargin;
}
@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
g.drawImage(img, x, y + height - img.getHeight(), c);
}
@Override
public Insets getBorderInsets(Component c) {
return new Insets(0, leftMargin, bottomMargin, 0);
}
@Override
public boolean isBorderOpaque() {
return false;
}
}
}
现在,也可以使用自定义Border
内的自定义绘画来完成此操作,但是这种方式更快;)
另外一个选项...
就是简单地使用JPanel
并添加将边框轮廓合并在一起的字段和JLabel
,例如...
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.Border;
public class TestTextField {
public static void main(String[] args) {
new TestTextField();
}
public TestTextField() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JTextField field = new JTextField(20);
field.setBorder(null);
JPanel fieldPane = new JPanel(new GridBagLayout());
fieldPane.setBackground(Color.WHITE);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.anchor = GridBagConstraints.WEST;
gbc.insets = new Insets(0, 8, 0, 0);
fieldPane.add(field, gbc);
try {
BufferedImage img = ImageIO.read(getClass().getResource("/FieldBorder.png"));
gbc.insets = new Insets(0, 0, 0, 0);
fieldPane.add(new JLabel(new ImageIcon(img)), gbc);
} catch (IOException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridBagLayout());
frame.add(fieldPane);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
但这将取决于需求和要求...
带有背景的文本字段
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.GridBagLayout;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.Document;
public class TextFieldBackground {
public static void main(String[] args) {
new TextFieldBackground();
}
public TextFieldBackground() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
TextFieldWithBackground field = new TextFieldWithBackground(40);
try {
field.setBackgroundImage(ImageIO.read(getClass().getResource("/clouds.jpg")));
} catch (IOException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridBagLayout());
frame.add(field);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TextFieldWithBackground extends JTextField {
private BufferedImage bg;
public TextFieldWithBackground() {
}
public TextFieldWithBackground(String text) {
super(text);
}
public TextFieldWithBackground(int columns) {
super(columns);
}
public TextFieldWithBackground(String text, int columns) {
super(text, columns);
}
public TextFieldWithBackground(Document doc, String text, int columns) {
super(doc, text, columns);
}
public void setBackgroundImage(BufferedImage bg) {
this.bg = bg;
setOpaque(bg == null);
repaint();
}
@Override
protected void paintComponent(Graphics g) {
if (bg != null) {
int x = 0;
int y = (getHeight() - bg.getHeight()) / 2;
while (x < getWidth()) {
g.drawImage(bg, x, y, this);
x += bg.getWidth();
}
}
super.paintComponent(g);
}
}
}
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