finekit/src/main/java/com/fanruan/api/design/work/component/ItemEditableComboBoxPanel.java

package com.fanruan.api.design.work.component;

import com.fanruan.api.design.ui.component.UIButton;
import com.fanruan.api.design.ui.component.UIComboBox;
import com.fanruan.api.util.IOKit;
import com.fanruan.api.util.StringKit;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
 * @author richie
 * @version 10.0
 * Created by richie on 2021/3/18
 */
public abstract class ItemEditableComboBoxPanel extends JPanel {

    private static final long serialVersionUID = 1L;

    protected static final Object EMPTY = new Object() {
        public String toString() {
            return StringKit.EMPTY;
        }
    };

    protected UIComboBox<?> itemComboBox;
    protected UIButton editButton;
    protected UIButton refreshButton;

    public ItemEditableComboBoxPanel() {
        super();

        initComponents();
    }

    protected void initComponents() {
        this.setLayout(new BorderLayout(4, 4));
        Dimension buttonSize = new Dimension(26, 20);
        itemComboBox = new UIComboBox<>();
        itemComboBox.setEnabled(true);
        this.add(itemComboBox, BorderLayout.CENTER);
        refreshButton = new UIButton(IOKit.readIcon("/com/fr/design/images/control/refresh.png"));
        JPanel jPanel = new JPanel(new GridLayout(0, 2, 4, 4));
        editButton = initEditButton(editButton, buttonSize);
        jPanel.add(editButton);
        jPanel.add(refreshButton);
        this.add(jPanel, BorderLayout.EAST);
        refreshButton.setPreferredSize(buttonSize);
        refreshButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                refreshItems();
            }
        });
    }

    protected UIButton initEditButton(UIButton editButton, Dimension buttonSize) {
        editButton = new UIButton(IOKit.readIcon("/com/fr/design/images/control/control-center2.png"));
        editButton.setPreferredSize(buttonSize);
        editButton.addActionListener(evt -> editItems());
        return editButton;
    }


    /**
     * 给itemComboBox添加ActionListener
     */
    public void addComboBoxActionListener(ActionListener l) {
        itemComboBox.addActionListener(l);
    }

    protected void refreshItems() {
        // 记录原来选中的Item,重新加载后需要再次选中
        Object lastSelectedItem = itemComboBox.getSelectedItem();

        DefaultComboBoxModel<Object> model = ((DefaultComboBoxModel<Object>) itemComboBox.getModel());
        model.removeAllElements();

        // 先加EMPTY,再加items
        model.addElement(EMPTY);

        java.util.Iterator<String> itemIt = items();
        while (itemIt.hasNext()) {
            model.addElement(itemIt.next());
        }

        // 再次选中之前选中的Item
        int idx = model.getIndexOf(lastSelectedItem);
        if (idx < 0) {
            idx = 0;
        }
        itemComboBox.setSelectedIndex(idx);
    }

    /*
     * 得到其中的itemComboBox所选中的Item
     */
    public String getSelectedItem() {
        Object selected = itemComboBox.getSelectedItem();

        return selected instanceof String ? (String) selected : null;
    }

    /*
     * 选中name项
     */
    public void setSelectedItem(String name) {
        DefaultComboBoxModel model = ((DefaultComboBoxModel) itemComboBox.getModel());
        model.setSelectedItem(name);
    }

    /*
     * 刷新ComboBox.items
     */
    protected abstract java.util.Iterator<String> items();

    /*
     * 弹出对话框编辑Items
     */
    protected abstract void editItems();
}