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1 /*
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2 CCmI Editor - A Collaborative Cross-Modal Diagram Editing Tool
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3
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4 Copyright (C) 2011 Queen Mary University of London (http://ccmi.eecs.qmul.ac.uk/)
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5
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6 This program is free software: you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation, either version 3 of the License, or
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9 (at your option) any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program. If not, see <http://www.gnu.org/licenses/>.
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18 */
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19 package uk.ac.qmul.eecs.ccmi.gui;
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20
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21 import java.awt.event.ItemEvent;
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22 import java.awt.event.KeyEvent;
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23 import java.util.Vector;
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24
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25 import javax.swing.ComboBoxModel;
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26 import javax.swing.JComboBox;
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27
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28 /**
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29 * A ComboBox component which overrides the default behaviour when selecting items by the keyboard
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30 * up and down arrow keys. When the top is reached, if the user presses the up arrow key
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31 * instead of blocking on the first item, the LoopComboBox loops forward to the last item. Likewise,
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32 * when the bottom is reached and the user presses the down arrow key the LoopComboBox
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33 * loops back to the first item.
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34 *
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35 */
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36 @SuppressWarnings("serial")
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37 public class LoopComboBox extends JComboBox {
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38 public LoopComboBox(){
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39 super();
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40 }
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41
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42 public LoopComboBox(Object[] items){
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43 super(items);
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44 }
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45
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46 public LoopComboBox(ComboBoxModel aModel){
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47 super(aModel);
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48 }
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49
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50 public LoopComboBox(Vector<?> items){
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51 super(items);
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52 }
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53
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54 @Override
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55 public void processKeyEvent(KeyEvent e) {
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56 if(dataModel.getSize() == 0){
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57 super.processKeyEvent(e);
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58 }else{
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59 if(e.getKeyCode() == KeyEvent.VK_DOWN
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60 && e.getID()==KeyEvent.KEY_PRESSED
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61 && getSelectedIndex() == getItemCount()-1){
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62 setSelectedIndex(0);
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63 if(getItemCount() == 1)
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64 fireOneItemStateChanged();
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65 }else if(e.getKeyCode() == KeyEvent.VK_UP
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66 && e.getID()==KeyEvent.KEY_PRESSED
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67 && getSelectedIndex() == 0){
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68 setSelectedIndex(getItemCount()-1);
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69 if(getItemCount() == 1)
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70 fireOneItemStateChanged();
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71 }else
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72 super.processKeyEvent(e);
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73 }
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74 }
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75
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76 /*
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77 * when the comboBox has only one item the ItemStateChanged listeners ain't fired by default.
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78 * This behaviour has to be forced in order to have the item label to be spoken out by
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79 * the narrator, in spite of the item number .
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80 */
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81 private void fireOneItemStateChanged(){
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82 fireItemStateChanged(new ItemEvent(
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83 this,
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84 ItemEvent.ITEM_STATE_CHANGED,
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85 getSelectedItem(),
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86 ItemEvent.SELECTED
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87 ));
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88 }
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89 }
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