如何实现复选框列表java
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How to implement checkbox list java
提问by FrostyFire
Probably a noob question, but im new to java. I have a need for a checkbox list which I found is not supported in swing, but I found this custom control here
可能是一个菜鸟问题，但我是 Java 新手。我需要一个复选框列表，我发现它在 Swing 中不受支持，但我在这里找到了这个自定义控件
http://www.devx.com/tips/Tip/5342
http://www.devx.com/tips/Tip/5342
So I created a class file named CheckBoxList, and copied the code from the link into it:
所以我创建了一个名为CheckBoxList的类文件，并将链接中的代码复制到其中：
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
public class CheckBoxList extends JList
{
protected static Border noFocusBorder =
new EmptyBorder(1, 1, 1, 1);
public CheckBoxList()
{
setCellRenderer(new CellRenderer());
addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
int index = locationToIndex(e.getPoint());
if (index != -1) {
JCheckBox checkbox = (JCheckBox)
getModel().getElementAt(index);
checkbox.setSelected(
!checkbox.isSelected());
repaint();
}
}
}
);
setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
}
protected class CellRenderer implements ListCellRenderer
{
public Component getListCellRendererComponent(
JList list, Object value, int index,
boolean isSelected, boolean cellHasFocus)
{
JCheckBox checkbox = (JCheckBox) value;
checkbox.setBackground(isSelected ?
getSelectionBackground() : getBackground());
checkbox.setForeground(isSelected ?
getSelectionForeground() : getForeground());
checkbox.setEnabled(isEnabled());
checkbox.setFont(getFont());
checkbox.setFocusPainted(false);
checkbox.setBorderPainted(true);
checkbox.setBorder(isSelected ?
UIManager.getBorder(
"List.focusCellHighlightBorder") : noFocusBorder);
return checkbox;
}
}
}
The problem is I don't know how to implement it in my GUI file. I tried a lot of code, but they never showed an example. Just
问题是我不知道如何在我的 GUI 文件中实现它。我尝试了很多代码，但他们从未展示过示例。只是
To use the class, simply instantiate it, then pass it an array of JCheckBox objects (or subclasses of JCheckBox objects) by calling setListData
要使用该类，只需将其实例化，然后通过调用 setListData 将 JCheckBox 对象（或 JCheckBox 对象的子类）数组传递给它
So does that mean that I will not see the control in the Graphical Design view? My client wants to be able to edit it himself and add stuff so I want it to be easy and graphical if possible. If someone could show an example of instantiating it or give a good hint I would appreciate it. Thanks!
那么这是否意味着我不会在图形设计视图中看到该控件？我的客户希望能够自己编辑它并添加内容，所以我希望它尽可能简单和图形化。如果有人可以展示实例化它的示例或给出一个很好的提示，我将不胜感激。谢谢！
回答by mikemil
The code is expecting a list of JCheckBox objects - so this works
代码需要一个 JCheckBox 对象列表 - 所以这是有效的
CheckBoxList cbList = new CheckBoxList(); // the class you have
JCheckBox check1 = new JCheckBox("One");
JCheckBox check2 = new JCheckBox("two");
JCheckBox[] myList = { check1, check2}; list of checkbox object
cbList.setListData(myList); // set the list data for the object
Small Swing program using your class below
使用您的课程的小型 Swing 程序
util;
import javax.swing.*;
public class HelloWorldSwing {
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("HelloWorldSwing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
CheckBoxList cbList = new CheckBoxList();
JCheckBox check1 = new JCheckBox("One");
JCheckBox check2 = new JCheckBox("two");
JCheckBox[] myList = { check1, check2};
cbList.setListData(myList);
frame.getContentPane().add(cbList);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
}
回答by trashgod
Can you just tell me how?
你能告诉我怎么做吗？
Use a one column JTableand an appropriate renderer and editor. Based on this example, the code below relies on the default renderer for a data value of type Boolean.Class. A more general example is cited here.
使用一列JTable和适当的渲染器和编辑器。基于此示例，以下代码依赖于类型为数据值的默认呈现器Boolean.Class。这里引用了一个更一般的例子。
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import javax.swing.BorderFactory;
import javax.swing.DefaultListModel;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellRenderer;
/** @see https://stackoverflow.com/a/13919878/230513 */
public class CheckTable {
private static final CheckModel model = new CheckModel(5000);
private static final JTable table = new JTable(model) {
@Override
public Dimension getPreferredScrollableViewportSize() {
return new Dimension(150, 300);
}
@Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
JCheckBox jcb = (JCheckBox) super.prepareRenderer(renderer, row, column);
jcb.setHorizontalTextPosition(JCheckBox.LEADING);
jcb.setText(String.valueOf(row));
return jcb;
}
};
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame f = new JFrame("CheckTable");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setLayout(new GridLayout(1, 0));
f.add(new JScrollPane(table));
f.add(new DisplayPanel(model));
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
});
}
private static class DisplayPanel extends JPanel {
private DefaultListModel dlm = new DefaultListModel();
private JList list = new JList(dlm);
public DisplayPanel(final CheckModel model) {
super(new GridLayout());
this.setBorder(BorderFactory.createTitledBorder("Checked"));
this.add(new JScrollPane(list));
model.addTableModelListener(new TableModelListener() {
@Override
public void tableChanged(TableModelEvent e) {
dlm.removeAllElements();
for (Integer integer : model.checked) {
dlm.addElement(integer);
}
}
});
}
}
private static class CheckModel extends AbstractTableModel {
private final int rows;
private List<Boolean> rowList;
private Set<Integer> checked = new TreeSet<Integer>();
public CheckModel(int rows) {
this.rows = rows;
rowList = new ArrayList<Boolean>(rows);
for (int i = 0; i < rows; i++) {
rowList.add(Boolean.FALSE);
}
}
@Override
public int getRowCount() {
return rows;
}
@Override
public int getColumnCount() {
return 1;
}
@Override
public String getColumnName(int col) {
return "Column " + col;
}
@Override
public Object getValueAt(int row, int col) {
return rowList.get(row);
}
@Override
public void setValueAt(Object aValue, int row, int col) {
boolean b = (Boolean) aValue;
rowList.set(row, b);
if (b) {
checked.add(row);
} else {
checked.remove(row);
}
fireTableRowsUpdated(row, row);
}
@Override
public Class<?> getColumnClass(int col) {
return getValueAt(0, col).getClass();
}
@Override
public boolean isCellEditable(int row, int col) {
return true;
}
}
}
