设置JComboBox PopupMenu的大小 [英] Set Size of JComboBox PopupMenu
本文介绍了设置JComboBox PopupMenu的大小的处理方法，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
我正在编写一个扩展JComboBox的自定义组件。我的问题是，如果我要添加或删除项目，PopupMenu将不会实现其大小。所以有例如列表中有2个项目，但是如果我在PopupMenu中有2个空项目之前有4个项目。
i am programming a custom component which extends a JComboBox. My problem is, the PopupMenu won't actualise its size if i am adding or removing an item. So there are e.g. 2 items in the list, but if there were 4 before i had 2 "empty" items in the PopupMenu as well.
我找到的唯一解决方法是做（在JIntelligentComboBox.java line 213）
The only workaround i found was to do (in JIntelligentComboBox.java line 213)
this.setPopupVisible（false）;
this.setPopupVisible（true）;
但结果将是一个闪烁的PopupMenu： - （
but the result will be a flickering PopupMenu :-(
那么我还能做些什么来刷新/重绘PopupMenu而不会闪烁？
So what else could i do to refresh/repaint the PopupMenu without flickering?
For testing: the component and a little test programm
To generate my problem you could e.g.:
- 输入e
- 按返回
- 输入m
提前致谢
编辑：
我的目标是一个ComboBox，其行为类似于Firefox或Chrome中的地址栏，我想显示包含类型字符的PopupMenu的所有项目。
My goal is a ComboBox that acts like e.g. the adressbar in Firefox or Chrome, i want to show all items of the PopupMenu that contain the typed chars.
cboxtester.java：
cboxtester.java:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.plaf.basic.BasicComboBoxRenderer;
public class cboxtester extends JFrame {
private DefaultComboBoxModel dcm = new DefaultComboBoxModel(new Object[][] {new Object[] {"Mittagessen", "", 0},
new Object[] {"Essen", "", 0},
new Object[] {"Frühstück", "", 0},
new Object[] {"Abendessen", "", 0}});
private JIntelligentComboBox icb = new JIntelligentComboBox(dcm);
private cboxtester(){
this.add(icb, BorderLayout.CENTER);
this.add(new JButton("bla"), BorderLayout.EAST);
this.pack();
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
cboxtester cbt = new cboxtester();
}
}
JIntelligentComboBox.java：
JIntelligentComboBox.java:
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;
import java.util.Vector;
import javax.swing.ComboBoxEditor;
import javax.swing.ComboBoxModel;
import javax.swing.DefaultListCellRenderer;
import javax.swing.DefaultRowSorter;
import javax.swing.JComboBox;
import javax.swing.JList;
import javax.swing.JTextField;
import javax.swing.ListCellRenderer;
import javax.swing.MutableComboBoxModel;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;
import javax.swing.plaf.basic.BasicComboBoxEditor;
import javax.swing.plaf.basic.BasicComboBoxRenderer;
import javax.swing.plaf.metal.MetalComboBoxEditor;
public class JIntelligentComboBox extends JComboBox {
private ArrayList<Object> itemBackup = new ArrayList<Object>();
/** Initisiert die JIntelligentComboBox */
private void init(){
class searchComboBoxEditor extends BasicComboBoxEditor {
public searchComboBoxEditor(){
super();
}
@Override
public void setItem(Object anObject){
if (anObject == null) {
super.setItem(anObject);
} else {
Object[] o = (Object[]) anObject;
super.setItem(o[0]);
}
}
@Override
public Object getItem(){
return new Object[]{super.getItem(), super.getItem(), 0};
}
}
this.setEditor(new searchComboBoxEditor());
this.setEditable(true);
class searchRenderer extends BasicComboBoxRenderer {
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus){
if (index == 0) {
setText("");
this.setPreferredSize(new Dimension(1, 1));
return this;
}
this.setPreferredSize(new Dimension(160, 17));
if (index == list.getModel().getSize() - 1) {
this.setBorder(new EmptyBorder(0, 3, 1, 3));
} else {
this.setBorder(new EmptyBorder(0, 3, 0, 3));
}
Object[] v = (Object[]) value;
//System.out.println(v[0]);
this.setFont(new Font("Arial", Font.PLAIN, 12));
this.setBackground(Color.white);
String s = (String) v[0];
String lowerS = s.toLowerCase();
String sf = (String) v[1];
String lowerSf = sf.toLowerCase();
ArrayList<String> notMatching = new ArrayList<String>();
if (!sf.equals("")){
int fs = -1;
int lastFs = 0;
while ((fs = lowerS.indexOf((String) lowerSf, (lastFs == 0) ? -1 : lastFs)) > -1) {
notMatching.add(s.substring(lastFs, fs));
lastFs = fs + sf.length();
//System.out.println(fs+sf.length());
}
notMatching.add(s.substring(lastFs));
//System.out.println(notMatching);
}
String html = "";
if (notMatching.size() > 1) {
html = notMatching.get(0);
int start = html.length();
int sfl = sf.length();
for (int i = 1; i < notMatching.size(); i++) {
String t = notMatching.get(i);
html += "<b style=\"color: black;\">" + s.substring(start, start + sfl) + "</b>" + t;
start += sfl + t.length();
}
}
System.out.println(index + html);
this.setText("<html><head></head><body style=\"color: gray;\">" + html + "</body></head>");
return this;
}
}
this.setRenderer(new searchRenderer());
// leeres Element oben einfügen
int size = this.getModel().getSize();
Object[] tmp = new Object[this.getModel().getSize()];
for (int i = 0; i < size; i++) {
tmp[i] = this.getModel().getElementAt(i);
itemBackup.add(tmp[i]);
}
this.removeAllItems();
this.getModel().addElement(new Object[]{"", "", 0});
for (int i = 0; i < tmp.length; i++) {
this.getModel().addElement(tmp[i]);
}
// keylistener hinzufügen
this.getEditor().getEditorComponent().addKeyListener(new KeyListener() {
@Override
public void keyPressed(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
searchAndListEntries(((JTextField)JIntelligentComboBox.this.getEditor().getEditorComponent()).getText());
//System.out.println(((JTextField)JIntelligentComboBox.this.getEditor().getEditorComponent()).getText());
}
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
});
}
public JIntelligentComboBox(){
super();
}
public JIntelligentComboBox(MutableComboBoxModel aModel){
super(aModel);
init();
}
public JIntelligentComboBox(Object[] items){
super(items);
init();
}
public JIntelligentComboBox(Vector<?> items){
super(items);
init();
}
@Override
public MutableComboBoxModel getModel(){
return (MutableComboBoxModel) super.getModel();
}
private void searchAndListEntries(Object searchFor){
ArrayList<Object> found = new ArrayList<Object>();
//System.out.println("sf: "+searchFor);
for (int i = 0; i < this.itemBackup.size(); i++) {
Object tmp = this.itemBackup.get(i);
if (tmp == null || searchFor == null) continue;
Object[] o = (Object[]) tmp;
String s = (String) o[0];
if (s.matches("(?i).*" + searchFor + ".*")){
found.add(new Object[]{((Object[])tmp)[0], searchFor, ((Object[])tmp)[2]});
}
}
this.removeAllItems();
this.getModel().addElement(new Object[] {searchFor, searchFor, 0});
for (int i = 0; i < found.size(); i++) {
this.getModel().addElement(found.get(i));
}
this.setPopupVisible(true);
}
}
推荐答案
以下解决方案的基础是每次调用 searchAndListRoutine 时调整弹出窗口的大小。当弹出窗口显示在父框架的边界之外时，您需要考虑弹出窗口可以显示在自己的窗口中，或者它可以显示在父框架的分层窗格上：
The basis of the solution below is to resize the popup every time you invoke the searchAndListRoutine. You need to take into account that the popup can be displayed in its own Window when the popup displays outside the bounds of the parent frame or it can be displayed on the layered pane of the parent frame:
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.Vector;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.plaf.basic.*;
import javax.swing.plaf.metal.*;
import javax.swing.plaf.basic.*;
public class JIntelligentComboBox extends JComboBox {
private ArrayList<Object> itemBackup = new ArrayList<Object>();
/** Initisiert die JIntelligentComboBox */
private void init(){
class searchComboBoxEditor extends BasicComboBoxEditor {
public searchComboBoxEditor(){
super();
}
@Override
public void setItem(Object anObject){
if (anObject == null) {
super.setItem(anObject);
} else {
Object[] o = (Object[]) anObject;
super.setItem(o[0]);
}
}
@Override
public Object getItem(){
return new Object[]{super.getItem(), super.getItem(), 0};
}
}
this.setEditor(new searchComboBoxEditor());
this.setEditable(true);
class searchRenderer extends BasicComboBoxRenderer {
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus){
if (index == 0) {
setText("");
this.setPreferredSize(new Dimension(1, 1));
return this;
}
this.setPreferredSize(new Dimension(160, 17));
if (index == list.getModel().getSize() - 1) {
this.setBorder(new EmptyBorder(0, 3, 1, 3));
} else {
this.setBorder(new EmptyBorder(0, 3, 0, 3));
}
Object[] v = (Object[]) value;
//System.out.println(v[0]);
this.setFont(new Font("Arial", Font.PLAIN, 12));
this.setBackground(Color.white);
String s = (String) v[0];
String lowerS = s.toLowerCase();
String sf = (String) v[1];
String lowerSf = sf.toLowerCase();
ArrayList<String> notMatching = new ArrayList<String>();
if (!sf.equals("")){
int fs = -1;
int lastFs = 0;
while ((fs = lowerS.indexOf((String) lowerSf, (lastFs == 0) ? -1 : lastFs)) > -1) {
notMatching.add(s.substring(lastFs, fs));
lastFs = fs + sf.length();
//System.out.println(fs+sf.length());
}
notMatching.add(s.substring(lastFs));
//System.out.println(notMatching);
}
String html = "";
if (notMatching.size() > 1) {
html = notMatching.get(0);
int start = html.length();
int sfl = sf.length();
for (int i = 1; i < notMatching.size(); i++) {
String t = notMatching.get(i);
html += "<b style=\"color: black;\">" + s.substring(start, start + sfl) + "</b>" + t;
start += sfl + t.length();
}
}
this.setText("<html><head></head><body style=\"color: gray;\">" + html + "</body></head>");
return this;
}
}
this.setRenderer(new searchRenderer());
//
int size = this.getModel().getSize();
Object[] tmp = new Object[this.getModel().getSize()];
for (int i = 0; i < size; i++) {
tmp[i] = this.getModel().getElementAt(i);
itemBackup.add(tmp[i]);
}
this.removeAllItems();
this.getModel().addElement(new Object[]{"", "", 0});
for (int i = 0; i < tmp.length; i++) {
this.getModel().addElement(tmp[i]);
}
//
this.getEditor().getEditorComponent().addKeyListener(new KeyListener() {
@Override
public void keyPressed(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
searchAndListEntries(((JTextField)JIntelligentComboBox.this.getEditor().getEditorComponent()).getText());
//System.out.println(((JTextField)JIntelligentComboBox.this.getEditor().getEditorComponent()).getText());
}
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
});
}
public JIntelligentComboBox(){
super();
}
public JIntelligentComboBox(MutableComboBoxModel aModel){
super(aModel);
init();
}
public JIntelligentComboBox(Object[] items){
super(items);
init();
}
public JIntelligentComboBox(Vector<?> items){
super(items);
init();
}
@Override
public MutableComboBoxModel getModel(){
return (MutableComboBoxModel) super.getModel();
}
private void searchAndListEntries(Object searchFor){
ArrayList<Object> found = new ArrayList<Object>();
//System.out.println("sf: "+searchFor);
for (int i = 0; i < this.itemBackup.size(); i++) {
Object tmp = this.itemBackup.get(i);
if (tmp == null || searchFor == null) continue;
Object[] o = (Object[]) tmp;
String s = (String) o[0];
if (s.matches("(?i).*" + searchFor + ".*")){
found.add(new Object[]{((Object[])tmp)[0], searchFor, ((Object[])tmp)[2]});
}
}
this.removeAllItems();
this.getModel().addElement(new Object[] {searchFor, searchFor, 0});
for (int i = 0; i < found.size(); i++) {
this.getModel().addElement(found.get(i));
}
//this.setPopupVisible(true);
int size = this.getModel().getSize() - 1;
System.out.println("Elements: " + size);
if (size == 0)
{
this.setPopupVisible( false );
return;
}
this.setPopupVisible(true);
BasicComboPopup popup =
(BasicComboPopup)this.getAccessibleContext().getAccessibleChild(0);
Window popupWindow = SwingUtilities.windowForComponent(popup);
Window comboWindow = SwingUtilities.windowForComponent(this);
if (comboWindow.equals(popupWindow))
{
Component c = popup.getParent();
Dimension d = c.getPreferredSize();
c.setSize(d);
}
else
{
popupWindow.pack();
}
}
}
一个问题是，当组合框字段为空，模型包含4个条目。我猜这是你的匹配逻辑的一个问题。
The one issue is that when the combo box field is empty the model contains 4 entries. I would guess that is a problem with your matching logic.
这篇关于设置JComboBox PopupMenu的大小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！
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