删除JComboBox中的向下箭头

问题描述

我想创建一个自动完成程序，我正在使用 JComboBox 。

I want to create an auto complete program and I am using JComboBox for this.

现在我要删除 JComboBox 中的向下箭头。如何删除箭头？

Now I want to remove the down arrow in the JComboBox. How to remove the arrow?

推荐答案

是复合并包含 ，您可以通过setIcon（null）删除它或替换它与另一个图标

JComboBox is compound JComponent and contains JButton with Icon, you can remove that by setIcon(null) or replace with another Icon

例如（如何通过简单步骤执行此操作，注意仅适用于金属外观 ）

for example (how to do it with simple steps, NOTICE valid just for Metal Look and Feel)

        JComboBox coloredArrowsCombo = myComboBox;
        BufferedImage coloredArrowsImage = null;
        try {
            coloredArrowsImage = ImageIO.read(AppVariables.class.getResource("resources/passed.png"));
        } catch (IOException ex) {
            Logger.getLogger(someClessName.class.getName()).log(Level.SEVERE, null, ex);
        }
        if (!(coloredArrowsImage == null)) {
            Icon coloredArrowsIcon = new ImageIcon(coloredArrowsImage);
            Component[] comp = coloredArrowsCombo.getComponents();
            for (int i = 0; i < comp.length; i++) {
                if (comp[i] instanceof MetalComboBoxButton) {
                    MetalComboBoxButton coloredArrowsButton = (MetalComboBoxButton) comp[i];
                    coloredArrowsButton.setComboIcon(coloredArrowsIcon);
                    break;
                }
            }
        }

编辑：为了更好的输出你可以放在这里 coloredArrowsButton.setRolloverIcon（someIcon）;

for better output you can put here coloredArrowsButton.setRolloverIcon(someIcon);

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