Java 使用多个JComboxes和一个公共数据源
我希望能够使用多个JComboxes和一个公共数据源。我希望组合框能够显示该列表中的项目或空白项目,最重要的是,如果某个项目当前被另一个组合框选中,我希望组合框不显示该项目(但如果该项目未选中,则显示该项目) 我一直试图通过调用removeDuplicates()方法来实现这一点,该方法应将当前选定的所有项目添加到列表中,从主列表中删除该项目,然后将其设置为组合框的列表 这给了我一些有趣的问题。在我的程序中,主列表中的任何选项都不会显示,即使是在最初,但如果我去掉代码以删除重复项(初始化测试正常),它们也会显示 此外,即使它们是可编辑的组合框,我也无法将所选项目写入其中,但只要按enter按钮,它就会被删除Java 使用多个JComboxes和一个公共数据源,java,swing,user-interface,jcombobox,Java,Swing,User Interface,Jcombobox,我希望能够使用多个JComboxes和一个公共数据源。我希望组合框能够显示该列表中的项目或空白项目,最重要的是,如果某个项目当前被另一个组合框选中,我希望组合框不显示该项目(但如果该项目未选中,则显示该项目) 我一直试图通过调用removeDuplicates()方法来实现这一点,该方法应将当前选定的所有项目添加到列表中,从主列表中删除该项目,然后将其设置为组合框的列表 这给了我一些有趣的问题。在我的程序中,主列表中的任何选项都不会显示,即使是在最初,但如果我去掉代码以删除重复项(初始化测试正常
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Arrays;
import javax.swing.BoxLayout;
import javax.swing.JComboBox;
import javax.swing.JFrame;
@SuppressWarnings("serial")
public class Main extends JFrame implements ActionListener
{
ArrayList<String> commonItemList = new ArrayList<String>(Arrays.asList("Dog", "Cat", "Fish", "Bear", "Lion"));
ArrayList<JComboBox<Object>> comboBoxes = new ArrayList<>();
public Main()
{
this.setSize(new Dimension(500, 150));
this.setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS));
JComboBox<Object> comboBox1 = new JComboBox<Object>(commonItemList.toArray());
comboBox1.setEditable(true);
comboBox1.addActionListener(this);
JComboBox<Object> comboBox2 = new JComboBox<Object>(commonItemList.toArray());
comboBox2.setEditable(true);
comboBox2.addActionListener(this);
JComboBox<Object> comboBox3 = new JComboBox<Object>(commonItemList.toArray());
comboBox3.setEditable(true);
comboBox3.addActionListener(this);
this.add(comboBox1);
comboBoxes.add(comboBox1);
this.add(comboBox2);
comboBoxes.add(comboBox2);
this.add(comboBox3);
comboBoxes.add(comboBox3);
}
public static void main(String[] args)
{
Main main = new Main();
main.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent arg0)
{
removeDuplicates();
}
private void removeDuplicates()
{
ArrayList<String> currentlyUsedItems = new ArrayList<>();
ArrayList<String> availableItems = commonItemList;
// Add all currently selected items to usedItems list
for (JComboBox<Object> comboBox : comboBoxes)
{
currentlyUsedItems.add((String) comboBox.getSelectedItem());
}
// For every string in currentlyUsedItems remove it from availableItems
for (String string : currentlyUsedItems)
{
availableItems.remove(string);
}
// Remove all items from combobox, then add back all available Items, while disabling actionListener
for (JComboBox<Object> comboBox : comboBoxes)
{
comboBox.removeActionListener(this);
comboBox.removeAllItems();
for (String string : availableItems)
{
comboBox.addItem(string);
}
comboBox.addActionListener(this);
}
}
}
导入java.awt.Dimension;
导入java.awt.event.ActionEvent;
导入java.awt.event.ActionListener;
导入java.util.ArrayList;
导入java.util.array;
导入javax.swing.BoxLayout;
导入javax.swing.JComboBox;
导入javax.swing.JFrame;
@抑制警告(“串行”)
公共类Main扩展JFrame实现ActionListener
{
ArrayList commonItemList=新的ArrayList(Arrays.asList(“狗”、“猫”、“鱼”、“熊”、“狮子”));
ArrayList组合框=新建ArrayList();
公用干管()
{
此设置尺寸(新尺寸(500150));
this.setLayout(新的BoxLayout(getContentPane(),BoxLayout.Y_轴));
JComboBox comboBox1=新的JComboBox(commonItemList.toArray());
comboBox1.setEditable(真);
comboBox1.addActionListener(此);
JComboBox comboBox2=新的JComboBox(commonItemList.toArray());
comboBox2.setEditable(真);
comboBox2.addActionListener(此);
JComboBox comboBox3=新的JComboBox(commonItemList.toArray());
comboBox3.setEditable(真);
comboBox3.addActionListener(此);
添加(comboBox1);
combobox.add(comboBox1);
添加(comboBox2);
combobox.add(comboBox2);
添加(comboBox3);
combobox.add(comboBox3);
}
公共静态void main(字符串[]args)
{
Main Main=新Main();
main.setVisible(true);
}
@凌驾
已执行的公共无效操作(操作事件arg0)
{
移除重复项();
}
私有无效删除副本()
{
ArrayList currentlyUsedItems=新的ArrayList();
ArrayList availableItems=commonItemList;
//将当前选定的所有项目添加到usedItems列表
for(JComboBox组合框:组合框)
{
currentlyUsedItems.add((字符串)comboBox.getSelectedItem());
}
//对于currentlyUsedItems中的每个字符串,将其从availableItems中删除
for(字符串:currentlyUsedItems)
{
可用项。删除(字符串);
}
//从组合框中删除所有项目,然后添加回所有可用项目,同时禁用actionListener
for(JComboBox组合框:组合框)
{
comboBox.removeActionListener(此);
comboBox.removeAllItems();
for(字符串:availableItems)
{
comboBox.addItem(字符串);
}
comboBox.addActionListener(这个);
}
}
}
上面我发布了一个SSCCE,它没有和我的问题完全相同的问题,但不管怎样它仍然存在错误,并且使用了我用来解决问题的相同方法。是否有我遗漏的东西,或者这只是一种糟糕的解决方案?如图所示,操作模型而不是视图。在这种情况下,完全不同的模型可以共享对了解模型的公共数据源的访问。一种方法是简单地“禁用”组合下拉列表中的项目(即,使其不可选择),如果它们已经在另一个组合框中被选中 以下是禁用
JComboBox
中的项目的一种方法(使用金属):
import java.awt.*;
导入java.awt.event.*;
导入javax.swing.*;
导入javax.swing.plaf.basic.*;
导入javax.swing.plaf.metal.*;
公共类JComboxDisabledItemsDemo实现ItemListener,Runnable
{
私有静态最终字符串项[]=
{“黑色”、“蓝色”、“绿色”、“橙色”、“紫色”、“红色”、“白色”、“黄色”};
私人JCOMBOX jCombo;
私有JCheckBox[]复选框=新的JCheckBox[ITEMS.length];
私有布尔值[]enabledFlags=新布尔值[ITEMS.length];
公共静态void main(字符串参数[])
{
invokeLater(新的jcomboxDisabledItemsDemo());
}
@抑制警告(“未选中”)
公开募捐
{
JPanel pnlEnablers=新的JPanel(新的网格布局(0,1));
pnlEnablers.setboorder(BorderFactory.createTitledBorder(“已启用项”);
对于(int i=0;iimport java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.plaf.basic.*;
import javax.swing.plaf.metal.*;
public class JComboBoxDisabledItemsDemo implements ItemListener, Runnable
{
private static final String ITEMS[] =
{ "Black", "Blue", "Green", "Orange", "Purple", "Red", "White", "Yellow"};
private JComboBox jCombo;
private JCheckBox[] checkBoxes = new JCheckBox[ITEMS.length];
private boolean[] enabledFlags = new boolean[ITEMS.length];
public static void main(String args[])
{
SwingUtilities.invokeLater(new JComboBoxDisabledItemsDemo());
}
@SuppressWarnings("unchecked")
public void run()
{
JPanel pnlEnablers = new JPanel(new GridLayout(0,1));
pnlEnablers.setBorder(BorderFactory.createTitledBorder("Enabled Items"));
for (int i = 0; i < ITEMS.length; i++)
{
checkBoxes[i] = new JCheckBox(ITEMS[i]);
checkBoxes[i].setSelected(true);
checkBoxes[i].addItemListener(this);
enabledFlags[i] = true;
pnlEnablers.add(checkBoxes[i]);
}
jCombo = new JComboBox(ITEMS);
jCombo.setUI(new MetalComboBoxUI()
{
@Override
protected ComboPopup createPopup()
{
ComboPopup cp = new BasicComboPopup( comboBox )
{
@Override
protected void configureList()
{
super.configureList();
list.setSelectionModel(new DisabledItemSelectionModel());
}
};
return cp;
}
});
jCombo.setRenderer(new DisabledItemListCellRenderer());
JFrame f = new JFrame("Colors");
Container contentPane = f.getContentPane();
contentPane.setLayout(new BorderLayout());
contentPane.add(pnlEnablers, BorderLayout.CENTER);
contentPane.add(jCombo, BorderLayout.SOUTH);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(240, 280);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public void itemStateChanged(ItemEvent event)
{
JCheckBox checkBox = (JCheckBox) event.getSource();
int index = -1;
int selectedComboIndex = jCombo.getSelectedIndex();
for (int i = 0; i < ITEMS.length; i++)
{
if (ITEMS[i].equals(checkBox.getText()))
{
index = i;
break;
}
}
if (index != -1)
{
enabledFlags[index] = checkBox.isSelected();
jCombo.repaint();
if (index == selectedComboIndex)
{
jCombo.setSelectedIndex(-1);
}
}
}
public class DisabledItemListCellRenderer extends DefaultListCellRenderer
{
@Override
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus)
{
if (index < 0 || enabledFlags[index])
{
return super.getListCellRendererComponent(list, value, index,
isSelected, cellHasFocus);
}
Component comp = super.getListCellRendererComponent(list, value, index,
false, false);
comp.setEnabled(false);
return comp;
}
}
public class DisabledItemSelectionModel extends DefaultListSelectionModel
{
/**
* No need to override addSelectionInterval(int index0, int index1)
* since we're using SINGLE_SELECTION mode for this demo.
*/
@Override
public void setSelectionInterval(int index0, int index1)
{
if (enabledFlags[index0])
{
super.setSelectionInterval(index0, index0);
}
else
{
/*
* The previously selected index is before this one,
* so walk forward to find the next selectable item.
*/
if (getAnchorSelectionIndex() < index0)
{
for (int i = index0; i < enabledFlags.length; i++)
{
if (enabledFlags[i])
{
super.setSelectionInterval(i, i);
return;
}
}
}
/*
* Otherwise, walk backward to find the next selectable item.
*/
else
{
for (int i = index0; i >= 0; i--)
{
if (enabledFlags[i])
{
super.setSelectionInterval(i, i);
return;
}
}
}
}
}
}
}