package com.example.client.utils;
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import com.example.client.dto.JComboBoxItem;
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import javax.swing.*;
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import javax.swing.plaf.basic.BasicComboBoxEditor;
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import java.awt.*;
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import java.awt.event.*;
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import java.util.HashSet;
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import java.util.Set;
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public class MultiSelectComboBox extends JComboBox<JComboBoxItem> {
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private Set<Integer> selectedIndices = new HashSet<>();
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public MultiSelectComboBox(JComboBoxItem[] items) {
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super(items);
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setEditable(true);
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// 自定义渲染器
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setRenderer(new DefaultListCellRenderer() {
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@Override
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public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
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JCheckBox checkBox = new JCheckBox();
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checkBox.setText(((JComboBoxItem) value).getName());
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checkBox.setSelected(selectedIndices.contains(index)); // 修复选中状态判断
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checkBox.setEnabled(list.isEnabled());
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checkBox.setFont(list.getFont());
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checkBox.setFocusPainted(false);
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checkBox.setBackground(isSelected ? list.getSelectionBackground() : list.getBackground());
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checkBox.setForeground(isSelected ? list.getSelectionForeground() : list.getForeground());
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return checkBox;
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}
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});
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// 自定义编辑器
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setEditor(new BasicComboBoxEditor() {
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@Override
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public void setItem(Object anObject) {
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super.setItem(anObject);
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updateTextField(); // 确保文本框显示所有选中的项
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}
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});
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// 添加动作监听器
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addActionListener(e -> {
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int selectedIndex = getSelectedIndex();
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if (selectedIndex != -1) {
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if (selectedIndices.contains(selectedIndex)) {
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selectedIndices.remove(selectedIndex);
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} else {
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selectedIndices.add(selectedIndex);
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}
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updateTextField(); // 更新文本框内容
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}
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});
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// 添加焦点监听器
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addFocusListener(new FocusAdapter() {
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@Override
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public void focusLost(FocusEvent e) {
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updateTextField(); // 确保在失去焦点时更新文本框内容
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}
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});
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}
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private void updateTextField() {
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StringBuilder sb = new StringBuilder();
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for (Integer index : selectedIndices) {
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if (sb.length() > 0) {
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sb.append(",");
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}
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sb.append(((JComboBoxItem) getItemAt(index)).getName());
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}
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((JTextField) getEditor().getEditorComponent()).setText(sb.toString());
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}
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public Set<JComboBoxItem> getSelectedItems() {
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Set<JComboBoxItem> selectedItems = new HashSet<>();
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for (Integer index : selectedIndices) {
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selectedItems.add((JComboBoxItem) getItemAt(index));
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}
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return selectedItems;
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}
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public void setSelectedItems(Set<JComboBoxItem> items) {
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selectedIndices.clear(); // 清空当前选中项
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for (int i = 0; i < getItemCount(); i++) {
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JComboBoxItem item = getItemAt(i);
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if (items.contains(item)) {
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selectedIndices.add(i); // 将对应的索引添加到选中集合
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}
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}
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updateTextField(); // 更新文本框内容
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}
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}
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