我已经努力尝试解决这个问题6个小时了。我最终成功地改变了颜色,但我只想保留组合框箭头的默认颜色。
以下是代码...
注意: 编辑了代码,使其编译时不显示图片背景...
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:我正在使用自定义渲染器。以下是该代码...
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:
预期结果
BackgroundPanel
的引用)来使其运行,但如果我们可以直接将其粘贴到编辑器中,那就更好了。 (不幸的是,我在使用Mac,所以我无法帮助你解决问题。Mac不会给箭头着色,因为他们有一种更具体的LAF样式。) - RadiodefcharCombo.setBackground(...)
的原因是什么?渲染器的颜色应该透过来显示,所以我认为您不需要在组合框本身上设置背景。在组合框上设置背景似乎是改变箭头颜色的原因。 - Radiodef