Java setPressedIcon 不起作用

问题描述

我的应用程序中有菜单，我想设置菜单项正常状态图标和按下状态图标.添加了正常状态图标，但是当我按下菜单项时，按下状态图标不会改变正常状态图标.这里有什么问题:

I have menu in my application, and I want to set menu item normal state icon, and pressed state icon. Normal state icon is added, but when I press menu item, normal state icon is not changed by pressed state icon. What is problem here:

        JMenu m=new JMenu(text);
        m.setBackground(getTheme().colors.menuColor());
        m.setOpaque(false);
        m.setIcon(core.getIcon(text, "normal"));
        m.setPressedIcon(core.getIcon("webmaps", "pressed"));

推荐答案

此问题已以前看过.继承的 setPressedIcon 不会更改 JMenu(或实际上 JMenuItem)上的背景 Icon.您可以在组件上使用 MenuListener 作为解决方法:

This issue has been seen before. The inherited setPressedIcon does not change the background Icon on the the JMenu (or indeed JMenuItem). You could use a MenuListener on the component as a workaround:

m.addMenuListener(new MenuListener() {

    @Override
    public void menuSelected(MenuEvent e) {
        JMenu menu = (JMenu) e.getSource();
        menu.setIcon(core.getIcon("webmaps", "pressed"));
    }

    @Override
    public void menuDeselected(MenuEvent e) {
        JMenu menu = (JMenu) e.getSource();
        menu.setIcon(core.getIcon(text, "normal"));
    }

    @Override
    public void menuCanceled(MenuEvent e) {
        JMenu menu = (JMenu) e.getSource();
        menu.setIcon(core.getIcon(text, "normal"));
    }
});

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