我希望有人能帮助我。我试图在Java Swing中创建带有图标的“ countrycombobox”。我发现了一些东西,但对我没有任何帮助。也许问题是Iam仍然对Java是“新的”。
我只想这样简单:http://www.zomex.com/libs/images/layout/whmcs-template-language-select-w-flags-eco.jpg
只是国家前面的旗帜。
我真的很感谢一个可行的例子。我真的很奇怪,对于这样的东西,没有标准的选择或好的代码片段(Google经常在这里找到帮助)。
最佳答案
我找到了一个更好的例子,并想与您分享我的东西。只剩下一个问题,我没有确定它的大小。
package view;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CountryComboBox extends JPanel {
ImageIcon[] images;
String[] imgStrings = {"de"};
/*
* Despite its use of EmptyBorder, this panel makes a fine content
* pane because the empty border just increases the panel's size
* and is "painted" on top of the panel's normal background. In
* other words, the JPanel fills its entire background if it's
* opaque (which it is by default); adding a border doesn't change
* that.
*/
public CountryComboBox() {
super(new BorderLayout());
//Load the images and create an array of indexes.
images = new ImageIcon[imgStrings.length];
Integer[] intArray = new Integer[imgStrings.length];
for (int i = 0; i < imgStrings.length; i++) {
intArray[i] = new Integer(i);
images[i] = createImageIcon("/res/" + imgStrings[i] + ".png");
if (images[i] != null) {
images[i].setDescription(imgStrings[i]);
}
}
//Create the combo box.
JComboBox imgList = new JComboBox(intArray);
ComboBoxRenderer renderer= new ComboBoxRenderer();
imgList.setRenderer(renderer);
imgList.setMaximumRowCount(3);
//Lay out the demo.
add(imgList, BorderLayout.PAGE_START);
//setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
}
/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = CountryComboBox.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
class ComboBoxRenderer extends JLabel
implements ListCellRenderer {
private Font uhOhFont;
public ComboBoxRenderer() {
setOpaque(true);
setHorizontalAlignment(CENTER);
setVerticalAlignment(CENTER);
}
/*
* This method finds the image and text corresponding
* to the selected value and returns the label, set up
* to display the text and image.
*/
@Override
public Component getListCellRendererComponent(
JList list,
Object value,
int index,
boolean isSelected,
boolean cellHasFocus) {
//Get the selected index. (The index param isn't
//always valid, so just use the value.)
int selectedIndex = ((Integer)value).intValue();
if (isSelected) {
setBackground(list.getSelectionBackground());
setForeground(list.getSelectionForeground());
} else {
setBackground(list.getBackground());
setForeground(list.getForeground());
}
//Set the icon and text. If icon was null, say so.
ImageIcon icon = images[selectedIndex];
String img = imgStrings[selectedIndex];
setIcon(icon);
if (icon != null) {
setText(img);
setFont(list.getFont());
} else {
setUhOhText(img + " (no image available)",
list.getFont());
}
return this;
}
//Set the font and text when no image was found.
protected void setUhOhText(String uhOhText, Font normalFont) {
if (uhOhFont == null) { //lazily create this font
uhOhFont = normalFont.deriveFont(Font.ITALIC);
}
setFont(uhOhFont);
setText(uhOhText);
}
}
}
我在具有绝对布局的JPanel中调用它:
JComponent newContentPane = new CountryComboBox();
newContentPane.setOpaque(true); //content panes must be opaque
newContentPane.setBounds(10, 75, 50, 26);
contentPane.add(newContentPane);
setBounds无法正常工作,只是为了获得正确的位置。我不能用这个。
最好的祝福
阿卡尼斯