一个图片查看器能够打开选择器面板

最新推荐文章于 2025-02-11 10:47:37 发布

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最新推荐文章于 2025-02-11 10:47:37 发布

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本文介绍了一个使用Java Swing编写的简易图片浏览器应用，该应用支持多选导入JPG和GIF图片，并通过鼠标操作实现图片的水平切换及放大缩小功能。

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import java.awt.Graphics;
import java.awt.MouseInfo;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.File;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.filechooser.FileNameExtensionFilter;

public class App extends JFrame implements MouseListener, ActionListener {

int x = 0;
int y = 0;
File[] selectedFiles = null;
int fileIndex = 0;
int width = 200;
int height = 200;

public App() {

setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setSize(400, 300);
setResizable(false);
getContentPane().setLayout(null);

JPanel panel = new ImagePanel();
panel.setBounds(12, 40, 370, 218);
getContentPane().add(panel);

addMouseListener(this);
JButton btnBrowse = new JButton("Browse");
btnBrowse.addActionListener(this);
btnBrowse.setBounds(12, 9, 91, 21);
getContentPane().add(btnBrowse);
setVisible(true);
}

public static void main(String[] args) {
new App();
}

public void actionPerformed(ActionEvent e) {
JFileChooser chooser = new JFileChooser();
chooser.setMultiSelectionEnabled(true);
FileNameExtensionFilter filter = new FileNameExtensionFilter(
"JPG & GIF Images", "jpg", "gif");
// 设置文件类型
chooser.setFileFilter(filter);
// 打开选择器面板
int returnVal = chooser.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
selectedFiles = chooser.getSelectedFiles();
repaint();
}
}

public void mouseClicked(MouseEvent e) {

}

public void mouseEntered(MouseEvent e) {

}

public void mouseExited(MouseEvent e) {

}

public void mousePressed(MouseEvent e) {
Point point = MouseInfo.getPointerInfo().getLocation();
x = point.x;
y = point.y;
}

public void mouseReleased(MouseEvent e) {
Point point = MouseInfo.getPointerInfo().getLocation();
int thisX = point.x;
int thisY = point.y;
System.out.println("thisX=" + thisX + " " + "thisY=" + thisY);
if ((y - thisY < 20 && y - thisY > 0)
|| (y - thisY < 0 && y - thisY > -20)) {
// Y 在20范围内移动认为是水平移动
if (x < thisX) {
// right
if (selectedFiles != null
&& fileIndex < selectedFiles.length - 1) {
fileIndex++;
}
} else {
// left
if (selectedFiles != null && fileIndex > 0) {
fileIndex--;
}
}
} else {
if (x < thisX) {
// 右下
width += 20;
height += 20;
} else {
// 左上
width -= 20;
height -= 20;
}
}

repaint();
}

class ImagePanel extends JPanel {

public void paint(Graphics g) {
super.paint(g);

if (selectedFiles != null) {
ImageIcon icon = new ImageIcon(selectedFiles[fileIndex]
.getPath());
g.drawImage(icon.getImage(), 0, 0, width, height, this);
}
}
}
}