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java - JComboBox setBackground() 不改变箭头的颜色

转载 作者:行者123 更新时间:2023-11-29 04:31:30 25 4
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我已经花了 6 个小时试图解决这个问题。我终于可以根据需要更改颜色,但我只想保留组合框箭头的默认颜色。

这是代码...

注意:编辑后的代码编译时没有图片显示的背景...

import org.apache.commons.lang3.ArrayUtils;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.border.TitledBorder;
import javax.swing.plaf.ColorUIResource;
import javax.swing.plaf.metal.MetalComboBoxButton;

public class TestGui extends JFrame {
private final String[] guiCharSelDefault = {"--- Select Character ---"};
private final String[] characters = {"SelectedTextOne", "SelectedTextTwo", "SelectedTextThree", "SelectedTextFour"};
private final String[] guiCharSel = (String[]) ArrayUtils.addAll(guiCharSelDefault, characters);
private JComboBox charCombo = createStandardCombo(guiCharSel);
private JPanel topFrame = createTopFrame();
private JScrollPane topFrameScroll = createTopScrollPane();
private JPanel centerFrame = createCenterFrame();

//**************************************************************************************
// Constructor

TestGui(){
add(topFrameScroll, BorderLayout.NORTH);
add(centerFrame, BorderLayout.CENTER);

setSize(800,600);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

//**************************************************************************************
// Support Methods
private static GridBagConstraints setGbc(int gridx, int gridy, int gridWidth, int gridHeight, int ipadx, int ipady, String anchorLocation, double weightx, double weighty, Insets insets){
GridBagConstraints gbc = new GridBagConstraints();

if (anchorLocation.toUpperCase().equals("NORTHWEST")){
gbc.anchor = GridBagConstraints.NORTHWEST;
} else if (anchorLocation.toUpperCase().equals("NORTH")){
gbc.anchor = GridBagConstraints.NORTH;
} else if (anchorLocation.toUpperCase().equals("NORTHEAST")){
gbc.anchor = GridBagConstraints.NORTHEAST;
} else if (anchorLocation.toUpperCase().equals("WEST")){
gbc.anchor = GridBagConstraints.WEST;
} else if (anchorLocation.toUpperCase().equals("EAST")){
gbc.anchor = GridBagConstraints.EAST;
} else if (anchorLocation.toUpperCase().equals("SOUTHWEST")){
gbc.anchor = GridBagConstraints.SOUTHWEST;
} else if (anchorLocation.toUpperCase().equals("SOUTH")){
gbc.anchor = GridBagConstraints.SOUTH;
} else if (anchorLocation.toUpperCase().equals("SOUTHEAST")){
gbc.anchor = GridBagConstraints.SOUTHEAST;
} else {
gbc.anchor = GridBagConstraints.CENTER;
}

gbc.gridx = gridx; // column
gbc.gridy = gridy; // row
gbc.gridwidth = gridWidth; // number of columns
gbc.gridheight = gridHeight; // number of rows
gbc.ipadx = ipadx; // width of object
gbc.ipady = ipady; // height of object
gbc.weightx = weightx; // shifts rows to side of set anchor
gbc.weighty = weighty; // shifts columns to side of set anchor
gbc.insets = insets; // placement inside cell
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.fill = GridBagConstraints.VERTICAL;

return gbc;
}

private Insets setInsets(int top, int left, int bottom, int right){
Insets insets = new Insets(top,left,bottom,right);
return insets;
}

//**************************************************************************************
// Interactive Object Methods

private JComboBox createStandardCombo(String[] defaultValues){
JComboBox comboBox = new JComboBox(defaultValues);
ComboBoxRenderer cbr = new ComboBoxRenderer();
DefaultListCellRenderer dlcr = new DefaultListCellRenderer();
dlcr.setHorizontalTextPosition(SwingConstants.CENTER);
comboBox.setRenderer(cbr);
comboBox.setPrototypeDisplayValue("X" + guiCharSelDefault + "X");
return comboBox;
}

//**************************************************************************************
// Object Action Methods

private void setComboBoxColorBackgroundWithMetalArrow(Color color){
int componentCount = charCombo.getComponentCount();
for (int i = 0; i < componentCount; i++) {
Component component = charCombo.getComponent(i);
if (component instanceof MetalComboBoxButton) {
MetalComboBoxButton metalComboBoxButton =
(MetalComboBoxButton) component;
Icon comboIcon = metalComboBoxButton.getComboIcon();
BufferedImage bufferedImage =
new BufferedImage(
comboIcon.getIconWidth(),
comboIcon.getIconHeight(),
BufferedImage.TYPE_INT_ARGB);
comboIcon.paintIcon(
metalComboBoxButton, bufferedImage.getGraphics(), 0, 0);
}
}
}

private void setCharComboAction(){
charCombo.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String charName = ((JComboBox)(e.getSource())).getSelectedItem().toString();
if (!(charName.equals(guiCharSelDefault[0]))){
DefaultListCellRenderer dlcr = new DefaultListCellRenderer();
DefaultComboBoxModel model = new DefaultComboBoxModel(characters);
model.setSelectedItem(charName);
charCombo.setModel(model);
if (charName.equals("SelectedTextOne")){
//charCombo.getEditor().getEditorComponent().setBackground(Color.GREEN);
charCombo.setBackground(Color.GREEN);
} else if (charName.equals("SelectedTextTwo")){
charCombo.setBackground(Color.RED);
} else {
charCombo.setBackground(dlcr.getBackground());
}
}
}
}
);
}

//**************************************************************************************
// Panel Methods

private JPanel createTopFrame(){
JPanel pnl = new JPanel();

pnl.setLayout(new GridBagLayout());

setCharComboAction();
pnl.add(charCombo, setGbc(0,0, 1,1, 0,0, "WEST", 0, 0, setInsets(0, 10, 0, 0)));
JButton button = new JButton("Button");
pnl.add(button, setGbc(0,1, 1,1, 0,0, "WEST", 0, 0, setInsets(0, 10, 0, 0)));

pnl.setOpaque(false);
return pnl;
}

private JScrollPane createTopScrollPane(){
JScrollPane scrollPane = new JScrollPane();
Border raisedBevel = BorderFactory.createRaisedBevelBorder();
Border lineBorder = BorderFactory.createMatteBorder(2, 2, 2, 2, new Color(224,224,224));
Border loweredBevel = BorderFactory.createLoweredBevelBorder();
Border compoundSetup = BorderFactory.createCompoundBorder(raisedBevel, lineBorder);
Border compoundFinal = BorderFactory.createCompoundBorder(compoundSetup, loweredBevel);

scrollPane.setBorder(compoundFinal);
scrollPane.setOpaque(false);
scrollPane.getViewport().setOpaque(false);
scrollPane.getViewport().setView(topFrame);
return scrollPane;
}

private JPanel createCenterFrame() {
JPanel pnl = new JPanel();
Border raisedBevel = BorderFactory.createRaisedBevelBorder();
Color lineColor = new Color(224, 224, 224);
Border lineBorder = BorderFactory.createMatteBorder(5, 5, 5, 5, lineColor);
Border loweredBevel = BorderFactory.createLoweredBevelBorder();
Border compoundSetup = BorderFactory.createCompoundBorder(raisedBevel, lineBorder);
Border compoundFinal = BorderFactory.createCompoundBorder(compoundSetup, loweredBevel);
TitledBorder topFrameTitle = BorderFactory.createTitledBorder(compoundFinal, "Stuff");
topFrameTitle.setTitleJustification(TitledBorder.CENTER);

pnl.setBorder(topFrameTitle);
pnl.setLayout(new GridBagLayout());

pnl.setOpaque(false);
return pnl;
}

//**************************************************************************************

public static void main(String[] args) {

new TestGui();
}
}

注意:我使用的是自定义渲染器。这是该代码...

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class ComboBoxRenderer extends JLabel implements ListCellRenderer
{
private Color selectionBackgroundColor;
private DefaultListCellRenderer dlcr = new DefaultListCellRenderer();

// Constructor
public ComboBoxRenderer()
{
setOpaque(true);
setHorizontalAlignment(CENTER);
setVerticalAlignment(CENTER);
selectionBackgroundColor = this.dlcr.getBackground(); // Have to set a color, else a compiler error will occur
}

public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus)
{
// Set the list background color to default color (default color will show once selection is made)
setBackground(list.getBackground());
Color mouseHoverHighlight = Color.LIGHT_GRAY;
setText((String)value);

// Check which item is selected
if(isSelected)
{
// Set background color of the item your cursor is hovering over to the original background color
setBackground(mouseHoverHighlight);
}
else
{
// Set background to specific color depending on text value
String selectedTextInDropdownList = getText();
if (selectedTextInDropdownList.equals("SelectedTextOne")) {
setBackground(Color.GREEN);
} else if (selectedTextInDropdownList.equals("SelectedTextTwo")) {
setBackground(Color.RED);
} else {
setBackground(this.dlcr.getBackground());
}
}
String selectedText = getText();
if (selectedText.equals("SelectedTextOne")){
list.setSelectionBackground(Color.GREEN);
} else if (selectedText.equals("SelectedTextTwo")){
list.setSelectionBackground(Color.RED);
} else {
list.setSelectionBackground(this.dlcr.getBackground());
}

return this;
}
}

重现错误的步骤:

enter image description here

enter image description here

预期结果

enter image description here

最佳答案

您的方法是正确的,但是 BasicComboBoxUI 在您的轮子上放了一根辐条。幸运的是,我有一个技巧可以帮助您避免这个问题。

import java.awt.Color;
import java.awt.Component;
import java.awt.Font;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.UIManager;
import javax.swing.WindowConstants;
import javax.swing.plaf.basic.BasicComboBoxRenderer;

@SuppressWarnings("unchecked")
public class ComboBgTest {

private static final String[] VALUES = {"One", "Two", "Three"};
@SuppressWarnings("serial")
public static void main(String[] args) {
JComboBox<String> cb = new JComboBox<>(VALUES);
cb.setSelectedItem(null);
cb.setRenderer(new BasicComboBoxRenderer() {
boolean ignoreBG = true;
@Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected,
boolean cellHasFocus) {
ignoreBG = false;
Component c = super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
if (index == -1) { // check whether we are render the item shown at top
if (VALUES[0].equals(value)) {
c.setBackground(Color.RED);
} else if (VALUES[1].equals(value)) {
setBackground(Color.GREEN);
} else if (VALUES[2].equals(value)) {
setBackground(Color.BLUE);
}
}
ignoreBG = true;
return this;
}

@Override
public void setBackground(Color bg) {
// ignore all BG which is set from outside.
if (!ignoreBG) {
super.setBackground(bg);
}
}
});
JFrame frm = new JFrame("Combo test");
frm.add(cb);
frm.pack();
frm.setLocationRelativeTo(null);
frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frm.setVisible(true);
}
}

附言同样的方法也适用于字体和前景。

关于java - JComboBox setBackground() 不改变箭头的颜色,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43648636/

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