android/src/com/intellij/android/designer/propertyTable/editors/StringsComboEditor.java

/*
 * Copyright 2000-2012 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.intellij.android.designer.propertyTable.editors;

import com.intellij.designer.model.PropertiesContainer;
import com.intellij.designer.model.PropertyContext;
import com.intellij.designer.propertyTable.InplaceContext;
import com.intellij.designer.propertyTable.editors.ComboEditor;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

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

/**
 * @author Alexander Lobas
 */
public class StringsComboEditor extends ComboEditor {
  public static final String UNSET = "<unset>";

  public StringsComboEditor(String[] values) {
    DefaultComboBoxModel model = new DefaultComboBoxModel(values);
    model.insertElementAt(UNSET, 0);
    myCombo.setModel(model);
    myCombo.addActionListener(new AbstractAction() {
      @Override
      public void actionPerformed(ActionEvent e) {
        if (myCombo.getSelectedItem() == UNSET) {
          myCombo.setSelectedItem(null);
        }
      }
    });

    myCombo.setSelectedIndex(0);
  }

  @Override
  public Object getValue() throws Exception {
    Object item = myCombo.getSelectedItem();
    return item == UNSET ? null : item;
  }

  @NotNull
  @Override
  public JComponent getComponent(@Nullable PropertiesContainer container,
                                 @Nullable PropertyContext context, Object value,
                                 @Nullable InplaceContext inplaceContext) {
    myCombo.setSelectedItem(value);
    myCombo.setBorder(inplaceContext == null ? null : myComboBorder);
    return myCombo;
  }
}