Swing下拉复选框菜单

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首先放成品的展示图

就是这样的一个小插件。其实网上挺多示例代码的。但是为什么我花了不少时间在上面呢？

---这是因为我教授看了我之前做的web的项目，用JS你可以写出一个像这样的的框（下图）

看最上面那个框，颜色不一样的。没错，它像一个父节点一样，可以控制全选与全不选。

于是我手动加了一个“Select ALL”。不过我找了很久也找不到怎么样判断下拉菜单已经收回去了，而我又没有那么多时间，所以我最后放弃了让他自行判断，还是多加了两个button在最下方。

这个判断下拉菜单的弹出与收回的暂时留在future work里面吧。

组件的代码有参考别人的，但是我忘记哪里看的了。。。所以虽然标明转载但是忘记出处了

package UserInterface;import java.awt.BorderLayout;  import java.awt.GridLayout;  import java.awt.event.ActionEvent;  import java.awt.event.ActionListener;  import java.awt.event.ItemEvent;import java.awt.event.ItemListener;import java.util.ArrayList;  import java.util.List;    import javax.swing.JButton;  import javax.swing.JCheckBox;  import javax.swing.JPanel;  import javax.swing.JPopupMenu;    public class MultiPopup extends JPopupMenu {        private List<ActionListener> listeners = new ArrayList<ActionListener>();        private Object[] values;            private Object[] defaultValues;            private List<JCheckBox> checkBoxList = new ArrayList<JCheckBox>();            private JButton commitButton ;            private JButton cancelButton;            public static final String COMMIT_EVENT = "commit";            public static final String CANCEL_EVENT = "cancel";            public MultiPopup(Object[] value , Object[] defaultValue) {          super();          values = value;          defaultValues = defaultValue;          initComponent();      }        public void addActionListener(ActionListener listener) {          if (!listeners.contains(listener))              listeners.add(listener);      }        public void removeActionListener(ActionListener listener) {          if (listeners.contains(listener))              listeners.remove(listener);      }        private void initComponent() {                    JPanel checkboxPane = new JPanel();                    JPanel buttonPane = new JPanel();                    this.setLayout(new BorderLayout());                              for(Object v : values){              JCheckBox temp = new JCheckBox(v.toString() , selected(v));              checkBoxList.add(temp);          }                  if(checkBoxList.get(0).getText().equals("Selected All"))        checkBoxList.get(0).addItemListener(new ItemListener()         {            public void itemStateChanged(ItemEvent e)            {            System.out.println("被选中状态   "+checkBoxList.get(0).isSelected());           if(checkBoxList.get(0).isSelected())//Select All 被选中           {           //检查其他的是否被选中乳沟没有就选中他们           for(int i=1; i< checkBoxList.size();i++)           {           if(!checkBoxList.get(i).isSelected())           checkBoxList.get(i).setSelected(true);           }           }           else           {           for(int i=1; i< checkBoxList.size();i++)           {           if(checkBoxList.get(i).isSelected())           checkBoxList.get(i).setSelected(false);           }           }           }           });                                checkboxPane.setLayout(new GridLayout(checkBoxList.size() , 1 ,3, 3));          for(JCheckBox box : checkBoxList){              checkboxPane.add(box);          }                    commitButton = new JButton("ok");                    commitButton.addActionListener(new ActionListener(){                public void actionPerformed(ActionEvent e) {                  commit();              }                        });                    cancelButton = new JButton("cancel");                    cancelButton.addActionListener(new ActionListener(){                public void actionPerformed(ActionEvent e) {                  cancel();              }                        });                    buttonPane.add(commitButton);                    buttonPane.add(cancelButton);                    this.add(checkboxPane , BorderLayout.CENTER);                    this.add(buttonPane , BorderLayout.SOUTH);                          }        private boolean selected(Object v) {          for(Object dv : defaultValues){              if( dv .equals(v) ){                  return true;              }          }          return false;      }        protected void fireActionPerformed(ActionEvent e) {          for (ActionListener l : listeners) {              l.actionPerformed(e);          }      }            public Object[] getSelectedValues(){          List<Object> selectedValues = new ArrayList<Object>();                if(checkBoxList.get(0).getText().equals("Selected All"))        {        if(checkBoxList.get(0).isSelected())        {        for(int i = 1 ; i < checkBoxList.size() ; i++)     {     selectedValues.add(values[i]);     }        }        else        {        for(int i = 1 ; i < checkBoxList.size() ; i++){                                  if(checkBoxList.get(i).isSelected())                          selectedValues.add(values[i]);                  }          }        }else        for(int i = 0 ; i < checkBoxList.size() ; i++){                  if(checkBoxList.get(i).isSelected())                  selectedValues.add(values[i]);          }                          return selectedValues.toArray(new Object[selectedValues.size()]);      }        public void setDefaultValue(Object[] defaultValue) {          defaultValues = defaultValue;                }            public void commit(){          fireActionPerformed(new ActionEvent(this, 0, COMMIT_EVENT));      }            public void cancel(){          fireActionPerformed(new ActionEvent(this, 0, CANCEL_EVENT));      }    }

package UserInterface;import java.awt.Color;import java.awt.Component;import java.awt.Container;import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.Graphics;import java.awt.Insets;import java.awt.LayoutManager;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;import java.util.ArrayList;import java.util.List;import javax.swing.JButton;import javax.swing.JComponent;import javax.swing.JTextField;import javax.swing.UIManager;import javax.swing.plaf.basic.BasicArrowButton;public class MultiComboBox extends JComponent {private Object[] values;public Object[] defaultValues;private List<ActionListener> listeners = new ArrayList<ActionListener>();private MultiPopup popup;private JTextField editor;protected JButton   arrowButton;private String valueSperator;private static final String DEFAULT_VALUE_SPERATOR = ","; public MultiComboBox(Object[] value, Object[] defaultValue){this(value,defaultValue,DEFAULT_VALUE_SPERATOR);}public MultiComboBox(Object[] value, Object[] defaultValue , String valueSperator) {values = value;defaultValues = defaultValue;this.valueSperator = valueSperator;initComponent();}private void initComponent() {//暂时使用该布局,后续自己写个布局this.setLayout(new FlowLayout());popup =new  MultiPopup(values,defaultValues);popup.addActionListener(new PopupAction());editor = new JTextField();editor.setBackground(Color.WHITE);editor.setEditable(false);editor.setPreferredSize(new Dimension(150,20));//editor.setBorder(getBorder());editor.addMouseListener(new EditorHandler());arrowButton = createArrowButton();arrowButton.addMouseListener(new EditorHandler());add(editor);add(arrowButton);setText() ;}public Object[] getSelectedValues() {return popup.getSelectedValues();}public void addActionListener(ActionListener listener) {if (!listeners.contains(listener))listeners.add(listener);}public void removeActionListener(ActionListener listener) {if (listeners.contains(listener))listeners.remove(listener);}protected void fireActionPerformed(ActionEvent e) {for (ActionListener l : listeners) {l.actionPerformed(e);}}private class PopupAction implements ActionListener{public void actionPerformed(ActionEvent e) {if(e.getActionCommand().equals(MultiPopup.CANCEL_EVENT)){}else if(e.getActionCommand().equals(MultiPopup.COMMIT_EVENT)){defaultValues = popup.getSelectedValues();setText();//把事件继续传递出去fireActionPerformed(e);}togglePopup();}}private void togglePopup(){if(popup.isVisible()){popup.setVisible(false);}else{popup.setDefaultValue(defaultValues);popup.show(this, 0, getHeight());}}private void setText() {StringBuilder builder = new StringBuilder();for(Object dv : defaultValues){builder.append(dv);builder.append(valueSperator);}editor.setText(builder.substring(0, builder.length() > 0 ? builder.length() -1  : 0).toString());}private class EditorHandler implements MouseListener{public void mouseClicked(MouseEvent e) {togglePopup();}public void mousePressed(MouseEvent e) {}public void mouseReleased(MouseEvent e) {}public void mouseEntered(MouseEvent e) {}public void mouseExited(MouseEvent e) {}}  public void paintComponent(Graphics g){        g.setColor(Color.white);        g.fillRect(0,0,getWidth(),getHeight());    }        protected JButton createArrowButton() {        JButton button = new BasicArrowButton(BasicArrowButton.SOUTH,                                    UIManager.getColor("ComboBox.buttonBackground"),                                    UIManager.getColor("ComboBox.buttonShadow"),                                    UIManager.getColor("ComboBox.buttonDarkShadow"),                                    UIManager.getColor("ComboBox.buttonHighlight"));        button.setName("ComboBox.arrowButton");        return button;    }       private class MulitComboboxLayout  implements LayoutManager{public void addLayoutComponent(String name, Component comp) {// TODO Auto-generated method stub}public void removeLayoutComponent(Component comp) {// TODO Auto-generated method stub}public Dimension preferredLayoutSize(Container parent) {return parent.getPreferredSize();}public Dimension minimumLayoutSize(Container parent) {return parent.getMinimumSize();}public void layoutContainer(Container parent) {int w=parent.getWidth();            int h=parent.getHeight();            Insets insets=parent.getInsets();            h=h-insets.top-insets.bottom;}        }}

调用如下~

        JLabel label3 = new JLabel("Media Outlets:");        Object[] value = new String[]{ "Selected All","Al-Jazeera" , "BBC News" ,"Daily Mail" ,"Fox News","New York Daily News", "New York Times","the Guardian","Wall Street Journal"};          Object[] defaultValue = new String[]{ "Selected All" };                 MultiComboBox mulit = new MultiComboBox(value, defaultValue);

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