Comboboxes顯示按鈕列表

Question

我有一個顯示按鈕列表的組合框的問題。我現在已經是
http://hizliresim.com/djQzr7

不過，我想更多的東西像這樣 http://hizliresim.com/QXDE3G

第一個按鈕是組合框，第二個是組合框單擊時。

下面是代碼

package asd; 
import java.awt.Color; 
import java.awt.Component; 
import java.awt.Container; 
import java.awt.Dimension; 
import java.awt.EventQueue; 
import java.awt.Insets; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JList; 
import javax.swing.JPanel; 
import javax.swing.ListCellRenderer; 
import javax.swing.UIManager; 
import javax.swing.UnsupportedLookAndFeelException; 
import javax.swing.border.EmptyBorder; 
import javax.swing.JComboBox; 

public class asd extends JFrame { 

private JPanel contentPane; 

/** 
* Launch the application. 
*/ 
public static void main(String[] args) { 
    EventQueue.invokeLater(new Runnable() { 
     public void run() { 
      try { 
       asd frame = new asd(); 
       frame.setVisible(true); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     } 
    }); 
} 

/** 
* Create the frame. 
*/ 
public asd() { 
    try { 
     // Set System L&F 
    UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel"); 

    } 
    catch (UnsupportedLookAndFeelException e) { 
     // handle exception 
    } 
    catch (ClassNotFoundException e) { 
     // handle exception 
    } 
    catch (InstantiationException e) { 
     // handle exception 
    } 
    catch (IllegalAccessException e) { 
     // handle exception 
    } 
    ComboBoxRender renderer; 
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    setBounds(100, 100, 450, 300); 
    contentPane = new JPanel(); 
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); 
    setContentPane(contentPane); 
    contentPane.setLayout(null); 
    JComboBox comboBox = new JComboBox(); 
    comboBox.setBounds(92, 85, 60, 40);  
    renderer = new ComboBoxRender(); 
    comboBox.setRenderer(renderer); 
    comboBox.addItem("1"); 
    comboBox.addItem("2"); 
    comboBox.addItem("3"); 
    comboBox.setPreferredSize(new Dimension(60, 40)); 
    comboBox.setMinimumSize(new Dimension(70, 30)); 
    comboBox.setMaximumSize(new Dimension(500, 500)); 
    comboBox.setBackground(Color.GRAY); 
    comboBox.setUI(new javax.swing.plaf.metal.MetalComboBoxUI(){ 
     public void layoutComboBox(Container parent, MetalComboBoxLayoutManager manager) { 
      super.layoutComboBox(parent, manager); 
      arrowButton.setBounds(0,0,0,0); 
     } 
     }); 

    contentPane.add(comboBox); 
} 
} 
class ComboBoxRender implements ListCellRenderer<Object> { 

@Override 
public Component getListCellRendererComponent(JList<?> list, Object value, int index,boolean  isSelected, boolean cellHasFocus) { 

     JButton btn = new JButton(value.toString()); 
     btn.setSelected(false); 
     btn.setBorderPainted(true); 
     btn.setBackground(Color.gray); 
     btn.setSize(new Dimension(100, 100)); 
     btn.setMargin(new Insets(1, 1, 1, 1)); 
     btn.setMinimumSize(new Dimension(200,200)); 
     return btn; 

} 

}

Answer 1

對於您需要使用ListCellRenderer。閱讀關於custom renderers。

例如：

import java.awt.Component; 

import javax.swing.JButton; 
import javax.swing.JComboBox; 
import javax.swing.JFrame; 
import javax.swing.JList; 
import javax.swing.ListCellRenderer; 

public class TestFrame extends JFrame { 

    public TestFrame() { 
     init(); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     pack(); 
     setLocationRelativeTo(null); 
     setVisible(true); 
    } 

    private void init() { 
     JComboBox<String> box = new JComboBox<>(new String[]{"1","2"}); 
     box.setRenderer(getRenderer()); 
     add(box); 
    } 


    private ListCellRenderer<? super String> getRenderer() { 
     return new ListCellRenderer<String>() { 
      private JButton btn = new JButton(); 

      public Component getListCellRendererComponent(JList<? extends String> list,String value, int index, 
        boolean isSelected, boolean cellHasFocus) { 
       btn.setText(value); 
       return btn; 
      }; 
     }; 
    } 

    public static void main(String args[]) { 
     new TestFrame(); 
    } 

}