怎么在java.swing的comobobox里使用icon
时间: 2024-02-13 20:00:10 浏览: 28
要在Java Swing的ComboBox中使用图标,需要使用自定义的ListCellRenderer。以下是一个示例代码:
```java
class IconComboBoxRenderer extends JLabel implements ListCellRenderer<Object> {
private Icon icon;
public IconComboBoxRenderer() {
setOpaque(true);
setHorizontalAlignment(LEFT);
setVerticalAlignment(CENTER);
}
public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
if (value instanceof Icon) {
icon = (Icon) value;
setText("");
} else {
icon = null;
setText((value == null) ? "" : value.toString());
}
setIcon(icon);
setBackground(isSelected ? UIManager.getColor("ComboBox.selectionBackground") : UIManager.getColor("ComboBox.background"));
setForeground(isSelected ? UIManager.getColor("ComboBox.selectionForeground") : UIManager.getColor("ComboBox.foreground"));
setFont(list.getFont());
return this;
}
}
```
然后,可以将此Renderer设置为ComboBox的Renderer,如下所示:
```java
JComboBox<Object> comboBox = new JComboBox<>();
comboBox.setRenderer(new IconComboBoxRenderer());
comboBox.addItem(new ImageIcon("image.png"));
comboBox.addItem("Text Option");
```
注意,此示例代码假定图标是Icon类型的,如果你使用的是ImageIcon,则需要将`if (value instanceof Icon)`改为`if (value instanceof ImageIcon)`。
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