如何更改 JComboBox 中的箭头样式 [英] How can I change the arrow style in a JComboBox

问题描述

假设我想在 JComboBox 中为箭头使用自定义图像，我该怎么做?

Let's say I want to use a custom image for the arrow in JComboBox, how can I do this?

我知道可以使用 synth xml 文件，甚至 UIManager.put(...)，但我不知道如何使用.我此时想要做的就是将箭头图像更改为其他内容，以编程方式或什至只是覆盖它使用的图像.我究竟该怎么做?

I understand it's possible using the synth xml files, or maybe even UIManager.put(...), but I don't know how. All I want to do at this time is change the arrow image to something else, either programatically or even just overriding the image it uses. How exactly can I do this?

推荐答案

您可以覆盖 BasicComboBoxUI.BasicArrowButton 是一个方便的起点.

You can override createArrowButton() in BasicComboBoxUI. BasicArrowButton is a convenient starting point.

class ColorArrowUI extends BasicComboBoxUI {

    public static ComboBoxUI createUI(JComponent c) {
        return new ColorArrowUI();
    }

    @Override protected JButton createArrowButton() {
        return new BasicArrowButton(
            BasicArrowButton.SOUTH,
            Color.cyan, Color.magenta,
            Color.yellow, Color.blue);
    }
}

然后安装它.

JComboBox combo = new JComboBox();
combo.setUI(ColorArrowUI.createUI(combo));

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