色付きアイテムとフォーカスを持つjcombobox色付き

Question

色付きのドロップダウンリストを作成しようとしています（下のコードを参照してください）。コンボボックスがフォーカスを失った後、色が適用されています。

この動作は正しいですか？

コンボボックスにフォーカスがあるときに、どのようにフォアグラウンドおよび/または背景色を変更できますか？

おかげ

import java.awt.*; 
import java.awt.event.*; 
import java.util.*; 
import javax.swing.*; 
import javax.swing.border.*; 
public class DropDown { 
    enum Colors { 
     red(Color.red), orange(Color.orange), green(Color.green), yellow(Color.yellow), blue(Color.blue); 
     Colors(Color color) { 
      this.color = color; 
     } 
     static String[] listModel() { 
      java.util.List<Colors> values = Arrays.asList(values()); 
      String s = values.toString().replaceAll(" ", ""); 
      return s.substring(1, s.length() - 1).split(","); 
     } 
     final Color color; 
    } 
    static class ColoredCellRenderer implements ListCellRenderer { 
     protected DefaultListCellRenderer defaultRenderer = new DefaultListCellRenderer(); 
     private final static Dimension preferredSize = new Dimension(0, 20); 
     public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, 
       boolean cellHasFocus) { 
      JLabel renderer = (JLabel) defaultRenderer.getListCellRendererComponent(list, value, index, isSelected, 
        cellHasFocus); 
      if (index != -1) if (value instanceof String) renderer.setForeground(Colors.valueOf((String) value).color); 
      else 
       System.out.println("not a string"); 
      else 
       System.out.println("in getListCellRendererComponent, index=-1"); 
      renderer.setPreferredSize(preferredSize); 
      return renderer; 
     } 
    } 
    private static JComboBox addLabeledComboBox(Container c, String label, String[] model) { 
     JPanel panel = new JPanel(); 
     panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS)); 
     Border border = BorderFactory.createLineBorder(Color.green, 1); 
     panel.setBorder(border); 
     JLabel l = new JLabel(label); 
     panel.add(l); 
     final JComboBox comboBox = new JComboBox(model); 
     comboBox.setName(label); 
     l.setLabelFor(comboBox); 
     comboBox.setRenderer(new ColoredCellRenderer()); 
     panel.add(comboBox); 
     c.add(panel); 
     return comboBox; 
    } 
    private static void addContent(Container c) { 
     c.setLayout(new BoxLayout(c, BoxLayout.Y_AXIS)); 
     ActionListener actionListener = new ActionListener() { 
      @Override public void actionPerformed(ActionEvent e) { 
       if (e.getSource() instanceof JComboBox) { 
        final JComboBox comboBox = (JComboBox) e.getSource(); 
        Object selected = comboBox.getSelectedItem(); 
        String string = (String) selected; 
        Color color = Colors.valueOf(string).color; 
        int i = comboBox.getSelectedIndex(); 
        if (i != -1) { 
         System.out.println("comboBox " + comboBox.getName() + " " + color); 
         comboBox.setForeground(color); 
         System.out.println(comboBox.hasFocus()); 
         // comboBox.repaint(); 
        } else 
         System.out.println("in actionListener selected=" + selected); 
       } else 
        System.out.println("in actionListener selected is not a comboBox"); 
      } 
     }; 
     c.add(new JButton("button")); 
     for (int i = 0; i < 2; i++) { 
      JPanel panel = new JPanel(); 
      Border border = BorderFactory.createLineBorder(Color.red, 1); 
      panel.setBorder(border); 
      panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS)); 
      panel.add(new JLabel("label " +(i+1))); 
      JComboBox comboBox = addLabeledComboBox(panel, "" + (i + 1), Colors.listModel()); 
      comboBox.addActionListener(actionListener); 
      comboBox.setSelectedIndex(0); // select something 
      c.add(panel); 
     } 
    } 
    private static void createAndShowGUI() { 
     JFrame frame = new JFrame("Colored JComboBox"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     addContent(frame.getContentPane()); 
     frame.pack(); 
     frame.setVisible(true); 
    } 
    public static void main(String[] args) { 
     javax.swing.SwingUtilities.invokeLater(new Runnable() { 
      @SuppressWarnings("synthetic-access") public void run() { 
       createAndShowGUI(); 
      } 
     }); 
    } 
} 

Answer 1

は別のアプローチです：

//JList#setSelectionForeground(...) version 
static class ColoredCellRenderer implements ListCellRenderer { 
    protected DefaultListCellRenderer defaultRenderer = new DefaultListCellRenderer(); 
    private final Color selectionBackground = new Color(240,200,200); 
    public Component getListCellRendererComponent(
     JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { 
    Color fgc = Colors.valueOf((String)value).color; 
    if(index<0) { 
     //comboBox.setForeground(fgc); //Windows, CDE/Motif Look & Feel 
     list.setSelectionForeground(fgc); 
     list.setSelectionBackground(selectionBackground); 
    } 
    JLabel renderer = (JLabel) defaultRenderer.getListCellRendererComponent(
     list, value, index, isSelected, cellHasFocus); 
    if (index != -1) { 
     renderer.setForeground(fgc); 
    } 
    return renderer; 
    } 
} 

//html version 
static class ComboHtmlRenderer extends DefaultListCellRenderer { 
    private final Color selectionBackground = new Color(240,200,200); 
    @Override public Component getListCellRendererComponent(
     JList list, Object value, int index, boolean isSelected, boolean hasFocus) { 
    Color fgc = Colors.valueOf((String)value).color; 
    if(index<0) { 
     list.setSelectionBackground(selectionBackground); 
    } 
    JLabel l = (JLabel)super.getListCellRendererComponent(
       list, value, index, isSelected, hasFocus); 
    l.setText("<html><font color="+hex(fgc)+">"+value); 
    l.setBackground(isSelected?selectionBackground:list.getBackground()); 
    return l; 
    } 
    private static String hex(Color c) { 
    return String.format("#%06x", c.getRGB()&0xffffff); 
    } 
} 

Answer 2

エディタとレンダラを分割し、DefaultListCellRendererこれらの2つの方法

• に追加してくださいcellHasFocus

• isSelected

例

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.swing.border.LineBorder; 
import javax.swing.event.EventListenerList; 

class ColorComboBoxEditor1 implements ComboBoxEditor { 

    final protected JLabel editor; 
    //final protected JButton editor; 
    private EventListenerList listenerList = new EventListenerList(); 

    ColorComboBoxEditor1(Color initialColor) { 
     editor = new JLabel(""); 
     /*editor = new JButton(""); 
     editor.setBackground(initialColor); 
     ActionListener actionListener = new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent e) { 
       Color currentBackground = editor.getBackground(); 
       Color color = JColorChooser.showDialog(editor, "Color Chooser", currentBackground); 
       if ((color != null) && (currentBackground != color)) { 
        //editor.setBackground(color); 
        editor.setForeground(color); 
        fireActionEvent(color); 
       } 
      } 
     }; 
     editor.addActionListener(actionListener);*/ 
    } 

    @Override 
    public void addActionListener(ActionListener l) { 
     listenerList.add(ActionListener.class, l); 
    } 

    @Override 
    public Component getEditorComponent() { 
     return editor; 
    } 

    @Override 
    public Object getItem() { 
     return editor.getBackground(); 
    } 

    @Override 
    public void removeActionListener(ActionListener l) { 
     listenerList.remove(ActionListener.class, l); 
    } 

    @Override 
    public void selectAll() { 
    } 

    @Override 
    public void setItem(Object newValue) { 
     if (newValue instanceof Color) { 
      Color color = (Color) newValue; 
      //editor.setBackground(color); 
      editor.setForeground(color); 
      editor.setText(String.valueOf(newValue)); 
     } else { 
      try { 
       Color color = Color.decode(newValue.toString()); 
       //editor.setBackground(color); 
       editor.setForeground(color); 
       editor.setText(String.valueOf(newValue)); 
      } catch (NumberFormatException e) { 
      } 
     } 
    } 

    protected void fireActionEvent(Color color) { 
     Object listeners[] = listenerList.getListenerList(); 
     for (int i = listeners.length - 2; i >= 0; i -= 2) { 
      if (listeners[i] == ActionListener.class) { 
       ActionEvent actionEvent = new ActionEvent(editor, ActionEvent.ACTION_PERFORMED, color.toString()); 
       ((ActionListener) listeners[i + 1]).actionPerformed(actionEvent); 
      } 
     } 
    } 
} 

class ColorCellRenderer1 implements ListCellRenderer { 

    private DefaultListCellRenderer defaultRenderer = new DefaultListCellRenderer(); 
    // Width doesn't matter as the combo box will size 
    private final static Dimension preferredSize = new Dimension(0, 20); 

    @Override 
    public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { 
     JLabel renderer = (JLabel) defaultRenderer.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus); 
     if (value instanceof Color) { 
      //renderer.setBackground((Color) value); 
      renderer.setBackground(Color.white); 
      renderer.setForeground((Color) value); 
     } 
     if (cellHasFocus || isSelected) { 
      renderer.setBorder(new LineBorder(Color.DARK_GRAY)); 
     } else { 
      renderer.setBorder(null); 
     } 
     renderer.setPreferredSize(preferredSize); 
     return renderer; 
    } 
} 

class ColorComboBoxEditorRendererDemo1 { 

    public ColorComboBoxEditorRendererDemo1() { 
     Color colors[] = {Color.BLACK, Color.BLUE, Color.GREEN, Color.RED, Color.WHITE, Color.YELLOW}; 
     JFrame frame = new JFrame("Color JComboBox"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     final JComboBox comboBox = new JComboBox(colors); 
     comboBox.setEditable(true); 
     comboBox.setRenderer(new ColorCellRenderer1()); 
     Color color = (Color) comboBox.getSelectedItem(); 
     ComboBoxEditor editor = new ColorComboBoxEditor1(color); 
     comboBox.setEditor(editor); 
     frame.add(comboBox, BorderLayout.NORTH); 
     final JLabel label = new JLabel(); 
     label.setOpaque(true); 
     label.setBackground((Color) comboBox.getSelectedItem()); 
     frame.add(label, BorderLayout.CENTER); 
     ActionListener actionListener = new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent actionEvent) { 
       Color selectedColor = (Color) comboBox.getSelectedItem(); 
       label.setBackground(selectedColor); 
      } 
     }; 
     comboBox.addActionListener(actionListener); 
     frame.setSize(300, 200); 
     frame.setVisible(true); 
    } 

    public static void main(String args[]) { 
     SwingUtilities.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       ColorComboBoxEditorRendererDemo1 cCBERD1 = new ColorComboBoxEditorRendererDemo1(); 
      } 
     }); 
    } 
} 

Answer 3

例の前景色は正しく動作しているようです。他の特定の色は、下に示すように、特定のLook &フィールのコンポーネントのUIデリゲートによって管理されます。デリゲートは、選択、有効化など、さまざまな状態でコントラストを維持する方法で色を適用することを選択することができます。詳しくは、UIManager Defaultsの記事を参照してください。ここで

public static void main(String[] args) { 
    UIManager.put("ComboBox.background", new ColorUIResource(Color.lightGray)); 
    UIManager.put("ComboBox.selectionBackground", new ColorUIResource(Color.magenta)); 
    UIManager.put("ComboBox.selectionForeground", new ColorUIResource(Color.yellow)); 
    javax.swing.SwingUtilities.invokeLater(new Runnable() { 

     @SuppressWarnings("synthetic-access") 
     public void run() { 
      createAndShowGUI(); 
     } 
    }); 
}