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java - 如何在选择 JMenu 时将颜色 arrowIcon 更改为 JMenu

转载 作者:行者123 更新时间:2023-11-30 05:27:44 26 4
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我对 JMenu 的 arrowIcon 有问题:当我将鼠标悬停在它上面时,它会丢失我为其设置的颜色。

这是最小的例子

public class DemoLookAndFeel extends JFrame {

private JMenuBar menuBar = new JMenuBar();
private JMenu arrowMenuOne = new JMenu("Root Menu 1");
private JMenu arrowMenuTwo = new JMenu("Root Menu 2");

static {
UIManager.put("MenuItem.selectionForeground", Color.MAGENTA);
UIManager.put("MenuItem.foreground", Color.MAGENTA);
UIManager.put("Menu.selectionForeground", Color.MAGENTA);
UIManager.put("Menu.foreground", Color.MAGENTA);
}

public void init() {

setJMenuBar(menuBar);

addSubMenus(arrowMenuOne, 5);
addSubMenus(arrowMenuTwo, 3);

menuBar.add(arrowMenuOne);
menuBar.add(arrowMenuTwo);

this.setSize(800,800);
this.pack();
this.setLocationRelativeTo(null);
this.setVisible(true);
}

public void addSubMenus(JMenu parent, int number) {
for (int i = 1; i <= number; i++) {
JMenu menu = new JMenu("Sub Menu " + i);
parent.add(menu);

addSubMenus(menu, number - 1);
addMenuItems(menu, number);
}
}

public void addMenuItems(JMenu parent, int number) {
for (int i = 1; i <= number; i++) {
parent.add(new JMenuItem("Item " + i));
}
}


public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
DemoLookAndFeel demo = new DemoLookAndFeel();
demo.init();
}
});
}

}

请注意,此代码的某些部分取自有关堆栈溢出的其他答案。

我知道图标是用 BasiMenuUI 中的代码绘制的,但我仍然不明白为什么我没有得到所需的行为。

private void paintArrowIcon(Graphics g, MenuItemLayoutHelper lh,
MenuItemLayoutHelper.LayoutResult lr,
Color foreground) {
if (lh.getArrowIcon() != null) {
ButtonModel model = lh.getMenuItem().getModel();
if (model.isArmed() || (lh.getMenuItem() instanceof JMenu
&& model.isSelected())) {
g.setColor(foreground);
}
if (lh.useCheckAndArrow()) {
lh.getArrowIcon().paintIcon(lh.getMenuItem(), g,
lr.getArrowRect().x, lr.getArrowRect().y);
}
}
}

你能帮我一下吗?谢谢

最佳答案

when i mouse-over it, it loses the color that i have set for it.

这是因为 MetalLookAndFeelMetalTheme 忽略 BasicLookAndFeel 颜色设置,如下所示。

/* @see javax/swing/plaf/metal/MetalIconFactory.java */
class MenuArrowIcon implements Icon {
@Override public void paintIcon(Component c, Graphics g, int x, int y) {
JMenuItem b = (JMenuItem) c;
ButtonModel model = b.getModel();

g.translate(x, y);
if (!model.isEnabled()) {
g.setColor(MetalLookAndFeel.getMenuDisabledForeground());
} else {
if (model.isArmed() || (c instanceof JMenu && model.isSelected())) {
g.setColor(MetalLookAndFeel.getMenuSelectedForeground());
// use Color.MAGENTA: g.setColor(UIManager.getColor("Menu.selectedForeground"));
} else {
g.setColor(b.getForeground());
}
}
// if (MetalUtils.isLeftToRight(b)) {
int[] xPoints = {0, 3, 3, 0};
int[] yPoints = {0, 3, 4, 7};
g.fillPolygon(xPoints, yPoints, 4);
g.drawPolygon(xPoints, yPoints, 4);
// } else {
// int[] xPoints = {4, 4, 1, 1};
// int[] yPoints = {0, 7, 4, 3};
// g.fillPolygon(xPoints, yPoints, 4);
// g.drawPolygon(xPoints, yPoints, 4);
// }
g.translate(-x, -y);
}

@Override public int getIconWidth() {
return 4;
}

@Override public int getIconHeight() {
return 8;
}
}

要更改菜单箭头图标的选择前景色,您可能需要更改 MetalTheme 或设置您自己的 MenuArrowIcon:

import java.awt.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.plaf.metal.*;

public class DemoLookAndFeel2 extends JFrame {
private JMenuBar menuBar = new JMenuBar();
private JMenu arrowMenuOne = new JMenu("Root Menu 1");
private JMenu arrowMenuTwo = new JMenu("Root Menu 2");

static {
UIManager.put("MenuItem.selectionForeground", Color.MAGENTA);
UIManager.put("MenuItem.foreground", Color.MAGENTA);
UIManager.put("Menu.selectionForeground", Color.MAGENTA);
UIManager.put("Menu.foreground", Color.MAGENTA);
// or: UIManager.put("Menu.arrowIcon", new MenuArrowIcon());
}

public void init() {
setJMenuBar(menuBar);
addSubMenus(arrowMenuOne, 5);
addSubMenus(arrowMenuTwo, 3);

menuBar.add(arrowMenuOne);
menuBar.add(arrowMenuTwo);

this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
this.setSize(800, 800);
// this.pack();
this.setLocationRelativeTo(null);
this.setVisible(true);
}

public void addSubMenus(JMenu parent, int number) {
for (int i = 1; i <= number; i++) {
JMenu menu = new JMenu("Sub Menu " + i);
parent.add(menu);

addSubMenus(menu, number - 1);
addMenuItems(menu, number);
}
}

public void addMenuItems(JMenu parent, int number) {
for (int i = 1; i <= number; i++) {
parent.add(new JMenuItem("Item " + i));
}
}

public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override public void run() {
MetalLookAndFeel.setCurrentTheme(new DefaultMetalTheme() {
@Override public ColorUIResource getMenuSelectedForeground() {
return new ColorUIResource(Color.MAGENTA);
};
});
DemoLookAndFeel2 demo = new DemoLookAndFeel2();
demo.init();
}
});
}
}

关于java - 如何在选择 JMenu 时将颜色 arrowIcon 更改为 JMenu,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58207454/

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