java 不可编辑的 JComboBox 中所选项目的背景颜色
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Background color of the selected item in an uneditable JComboBox
提问by Paul Reiners
The background color of the selected item in an uneditable JComboBox is a sort of blue:
不可编辑的 JComboBox 中所选项目的背景颜色是一种蓝色：
Is there any way to make this a different color, such as white, for example?
有没有办法让它变成不同的颜色，例如白色？
回答by Costis Aivalis
This should work
这应该工作
jComboBox1.setRenderer(new DefaultListCellRenderer() {
@Override
public void paint(Graphics g) {
setBackground(Color.WHITE);
setForeground(Color.BLACK);
super.paint(g);
}
});
回答by camickr
The background assigned by the renderer is overriden by the selection background color of the JList that is used in the popup for the combo box. Check out the "paintCurrentValue" method of the BasicComboBoxUI class. So the workaround would be:
渲染器分配的背景被组合框弹出窗口中使用的 JList 的选择背景颜色覆盖。查看 BasicComboBoxUI 类的“paintCurrentValue”方法。所以解决方法是：
JComboBox comboBox = new JComboBox(...);
Object child = comboBox.getAccessibleContext().getAccessibleChild(0);
BasicComboPopup popup = (BasicComboPopup)child;
JList list = popup.getList();
list.setSelectionBackground(Color.RED);
This will affect the rendering of the popup as well. If you don't want it to affect the popup then you will need to create a custom renderer to specifically set the background of selected items.
这也会影响弹出窗口的呈现。如果您不希望它影响弹出窗口，那么您将需要创建一个自定义渲染器来专门设置所选项目的背景。
回答by aioobe
Have you tried writing your own, custom, ListCellRenderer?
您是否尝试过编写自己的自定义文件ListCellRenderer？
When that method is asked to provide a cell-rendering component you get the following arguments:
当要求该方法提供单元格渲染组件时，您将获得以下参数：
public Component getListCellRendererComponent(JList list,
Object value,
int index,
boolean isSelected,
boolean cellHasFocus) {
