最近在弄课程设计,我负责搞缩略图,遇到个问题,见上图请问如何实现最后一行的缩略图左对齐,以及如何改变缩略图间的间距
缩略图和文件名打包放在一个JPanel里面,然后将这些JPanel再放到一个大的JPane里面,没有用到Layout,因为用Layout后会改变我的部件大小,我不会控制(这个问题我纠结很久,用了GridBagLayout也不行,貌似失效了)
下面贴出代码,有劳各位指点迷津:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.Insets;
import java.io.File;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;public class ThumbnailPanel extends JPanel { private File PraFile; //根目录
private String[] SubFile; //根目录下文件名
private String[] ImgPath; //根目录下能识别图像
private ImageIcon[] Img; //图片文件
private Image[] Thumbnail; //缩略图
private int ImgCount; //图片数目
private JPanel[] JpThum; //用于装载缩略图+文件名
private JPanel[] JpPic; //用于装载缩略图
private JLabel[] Pic;
private JPanel[] JpTex;
private JLabel[] Name; ThumbnailPanel(String PraPath) {
ImgPath = new String[1000];
Img = new ImageIcon[1000];
Thumbnail = new Image[1000];
ImgCount = 0; JpThum = new JPanel[1000];
Pic = new JLabel[1000];
Name = new JLabel[1000];
JpPic = new JPanel[1000];
JpTex = new JPanel[1000]; loadImg(PraPath);
paintPanel(); } public Image getThumbnail(ImageIcon Img) { //根据图片宽和高的比例选择缩放
Image img;
if (Img.getIconHeight() > Img.getIconWidth()) {
img = Img.getImage().getScaledInstance(-100, 100, 1);
} else {
img = Img.getImage().getScaledInstance(100, -100, 1);
}
return img;
} public void loadImg(String PraPath) { //将根目录下图片格式的文件读入图片数组 //装载目录下图片文件名
PraFile = new File(PraPath);
SubFile = PraFile.list();
for (int i = 0; i < SubFile.length; ++i) {
if (SubFile[i].contains(".jpeg") || SubFile[i].contains(".png") || SubFile[i].contains(".jpg") || SubFile[i].contains(".gif")) {
ImgPath[ImgCount++] = "D:/javapic/" + SubFile[i];
}
}
//装载图片和缩略图
for (int i = 0; i < ImgCount; ++i) {
Img[i] = new ImageIcon(ImgPath[i]);
Thumbnail[i] = getThumbnail(Img[i]);
}
} public void paintPanel() { //载入到缩略图面板 for (int i = 0; i < ImgCount; ++i) {
Pic[i] = new JLabel(new ImageIcon(Thumbnail[i]));
Name[i] = new JLabel(ImgPath[i].replace("D:/javapic/", ""), JLabel.CENTER);
Name[i].setBorder(BorderFactory.createEmptyBorder()); JpThum[i] = new JPanel(); JpPic[i] = new JPanel(new BorderLayout());
JpPic[i].add(Pic[i], "South");
JpPic[i].setPreferredSize(new Dimension(100, 100)); JpTex[i] = new JPanel(new BorderLayout());
JpTex[i].add(Name[i], "North");
JpTex[i].setPreferredSize(new Dimension(100, 35)); Dimension a = new Dimension(100, 135);
JpThum[i].setPreferredSize(a);
JpThum[i].add(JpPic[i], "North");
JpThum[i].add(JpTex[i], "South");
}
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints c = new GridBagConstraints(0,0,1,1,0,0,GridBagConstraints.EAST,GridBagConstraints.NONE,new Insets(150,150,150,150),100,100);
for (int i = 0; i < ImgCount; ++i) {
gridbag.setConstraints(JpThum[i], c);//结果表明用了跟直接add是一样的
add(JpThum[i]);
}
} public static void main(String[] args) {
ThumbnailPanel tp = new ThumbnailPanel("D:/javapic/");
JFrame jf = new JFrame();
jf.add(tp);
jf.pack();
jf.setSize(600, 600);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setVisible(true);
}
}
解决方案 »
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