用于过滤列表的组件 [英] Component for filtering a list
本文介绍了用于过滤列表的组件的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
什么是适合创建可过滤列表的Java Swing组件,如下所示?
What is the Java Swing component that would be suitable for creating a filterable list like seen below?
推荐答案
这种类型的过滤最容易使用一列的JTable
。表具有内置功能,可添加 RowSorter
其中:
This type of filtering is most easily done using a single column JTable
. A table has inbuilt functionality to add a RowSorter
which:
..提供排序和过滤的基础。
另见如何使用表格:排序和过滤。
以下是过滤示例字体系列名称:
Here is an example for filtering the font family names:
左边是一个更寻找列表的组件,而右边则是一个显然是表格的组件。
On the left is a more 'list looking' component, while the right hand side shows a component that is clearly a table.
import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.event.*;
import javax.swing.text.Document;
import javax.swing.table.TableRowSorter;
public class FontFilter {
private JComponent ui = null;
JTextField filterText;
TableRowSorter sorter;
FontFilter(boolean listLike) {
initUI(listLike);
}
public void initUI(boolean listLike) {
if (ui != null) {
return;
}
ui = new JPanel(new BorderLayout(4, 4));
ui.setBorder(new EmptyBorder(4, 4, 4, 4));
GraphicsEnvironment ge
= GraphicsEnvironment.getLocalGraphicsEnvironment();
String[] fonts = ge.getAvailableFontFamilyNames();
String[][] tableData = new String[fonts.length][1];
for (int i = 0; i < fonts.length; i++) {
tableData[i][0] = fonts[i];
}
String[] header = {"Fonts"};
JTable table = new JTable(tableData, header);
if (listLike) {
Dimension d = table.getPreferredScrollableViewportSize();
table.setPreferredScrollableViewportSize(new Dimension(d.width/2,d.height));
table.setShowGrid(false);
table.setTableHeader(null);
table.setFillsViewportHeight(true);
}
ui.add(new JScrollPane(table));
sorter = new TableRowSorter(table.getModel());
table.setRowSorter(sorter);
filterText = new JTextField(10);
ui.add(filterText, BorderLayout.PAGE_START);
Document doc = filterText.getDocument();
DocumentListener listener = new DocumentListener() {
@Override
public void insertUpdate(DocumentEvent e) {
newFilter();
}
@Override
public void removeUpdate(DocumentEvent e) {
newFilter();
}
@Override
public void changedUpdate(DocumentEvent e) {
newFilter();
}
};
doc.addDocumentListener(listener);
}
private void newFilter() {
RowFilter rf = null;
//If current expression doesn't parse, don't update.
try {
rf = RowFilter.regexFilter(filterText.getText(), 0);
} catch (java.util.regex.PatternSyntaxException e) {
return;
}
sorter.setRowFilter(rf);
}
public JComponent getUI() {
return ui;
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception useDefault) {
}
FontFilter o1 = new FontFilter(true);
FontFilter o2 = new FontFilter(false);
JFrame f = new JFrame("Font Filter");
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
f.setLocationByPlatform(true);
f.add(o1.getUI(), BorderLayout.LINE_START);
f.add(o2.getUI(), BorderLayout.CENTER);
f.pack();
f.setMinimumSize(f.getSize());
f.setVisible(true);
}
};
SwingUtilities.invokeLater(r);
}
}
这篇关于用于过滤列表的组件的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文