在java中删除所选图像
我正在制作图像 我创建了两个按钮addButton和removeButton addButton使用附加到JLabel的JFileChooser添加图像 和removeButton以删除图像 我使用addButton添加了4个图像 现在我想点击一个图像,当我按下移除按钮时,它不会被移除 我刚开始荡秋千,请帮帮我 多谢各位 编辑:我的代码在java中删除所选图像,java,image,swing,jbutton,jlabel,Java,Image,Swing,Jbutton,Jlabel,我正在制作图像 我创建了两个按钮addButton和removeButton addButton使用附加到JLabel的JFileChooser添加图像 和removeButton以删除图像 我使用addButton添加了4个图像 现在我想点击一个图像,当我按下移除按钮时,它不会被移除 我刚开始荡秋千,请帮帮我 多谢各位 编辑:我的代码 import java.awt.Container; import java.awt.FlowLayout; import java.awt.event.Act
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;
import javax.swing.filechooser.FileNameExtensionFilter;
public class ImageCreation extends JFrame
{
JButton browseBtn=new JButton("Browse");
JButton removeBtn=new JButton("Remove");
String filename;
BufferedImage img;
JLabel imgLbl;
private volatile JLabel lastFocused;
public ImageCreation()
{
setSize(500,500);
setVisible(true);
setLayout(new FlowLayout());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
add(browseBtn);
add(removeBtn);
browseBtn.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
JFileChooser chooser = new JFileChooser();
chooser.setMultiSelectionEnabled(true);
chooser.addChoosableFileFilter(new
FileNameExtensionFilter("Images", "jpg", "png", "gif", "bmp"));
chooser.setAcceptAllFileFilterUsed(false);
chooser.setCurrentDirectory(new
File(System.getProperty("user.home")));
int option = chooser.showOpenDialog(ImageCreation.this);
if(option == JFileChooser.APPROVE_OPTION) {
filename=chooser.getSelectedFile().toString();
try {
img = ImageIO.read(new File(filename));
imgLbl = new JLabel();
imgLbl.setIcon(new ImageIcon(img));
imgLbl.setBounds(150,50,img.getWidth(),img.getHeight());
add(imgLbl);
imgLbl.addFocusListener(new FocusAdapter()
{
public void focusGained(FocusEvent e)
{
if (e.getComponent() instanceof JLabel)
lastFocused = (JLabel) e.getComponent();
}
});
imgLbl.repaint();
} catch (IOException e) { }
}
}
});
removeBtn.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
if(lastFocused==null)
JOptionPane.showMessageDialog(null,"You Must Select an Label to remove it");
if (lastFocused != null)
{
Container scollPane = lastFocused;
System.out.println(scollPane);
Container parent = scollPane.getParent();
System.out.println(parent);
parent.remove(scollPane);
}
}
});
}
public static void main(String args[])
{
new ImageCreation();
}
}
JLabel没有键盘焦点,只有鼠标。 我没有更改您的代码,只是让它工作:
imgLbl.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if (e.getComponent() instanceof JLabel)
lastFocused = (JLabel) e.getComponent();
}
});
删除后必须重新绘制,因此只需在此代码后添加repaint()
:
if (lastFocused != null) {
Container scollPane = lastFocused;
System.out.println(scollPane);
Container parent = scollPane.getParent();
System.out.println(parent);
parent.remove(scollPane);
}
repaint(); // repainting after removal
请复制并粘贴以下代码。应该行得通
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;
import javax.swing.filechooser.FileNameExtensionFilter;
public class ImageCreation extends JFrame
{
JButton browseBtn=new JButton("Browse");
JButton removeBtn=new JButton("Remove");
String filename;
BufferedImage img;
JLabel imgLbl;
private volatile JLabel lastFocused;
public ImageCreation()
{
setSize(500,500);
setVisible(true);
setLayout(new FlowLayout());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
add(browseBtn);
add(removeBtn);
browseBtn.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
JFileChooser chooser = new JFileChooser();
chooser.setMultiSelectionEnabled(true);
chooser.addChoosableFileFilter(new
FileNameExtensionFilter("Images", "jpg", "png", "gif", "bmp"));
chooser.setAcceptAllFileFilterUsed(false);
chooser.setCurrentDirectory(new
File(System.getProperty("user.home")));
int option = chooser.showOpenDialog(ImageCreation.this);
if(option == JFileChooser.APPROVE_OPTION) {
filename=chooser.getSelectedFile().toString();
try {
img = ImageIO.read(new File(filename));
imgLbl = new JLabel();
imgLbl.setIcon(new ImageIcon(img));
imgLbl.setBounds(150,50,img.getWidth(),img.getHeight());
add(imgLbl);
imgLbl.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if (e.getComponent() instanceof JLabel)
lastFocused = (JLabel) e.getComponent();
}
});
imgLbl.repaint();
} catch (IOException e) { }
}
}
});
removeBtn.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
if(lastFocused==null)
JOptionPane.showMessageDialog(null,"You Must Select an Label to remove it");
if (lastFocused != null)
{
Container scollPane = lastFocused;
System.out.println(scollPane);
Container parent = scollPane.getParent();
System.out.println(parent);
parent.remove(scollPane);
}
repaint();
}
});
}
public static void main(String args[])
{
new ImageCreation();
}
}
你的代码如何?张贴你的代码,是否有任何错误被抛出?考虑制作一个SSCCETE是我编辑和完成的代码可以在系统中运行,并请帮助添加/删除从<代码> jList(和删除所有的<代码> StimeSimult(..)< /代码>废话”。它对我无效。图像没有被删除。它显示了一个错误。“你必须选择一个标签才能删除它”即使我选择了它,我也认为它有效。但我使用了getContentPane()。repaint方法比repaint()方法有一点小的改变。但是你在这方面帮了我很多忙。我只是对它很生气