Listening for Changes to the Items in a JList Component

 

import javax.swing.DefaultListModel;
import javax.swing.JList;
import javax.swing.event.ListDataEvent;
import javax.swing.event.ListDataListener;

public class Main {
  public static void main(String[] argv) throws Exception {
    JList list = new JList();
    // Register a list data listener
    DefaultListModel model = (DefaultListModel) list.getModel();
    model.addListDataListener(new MyListDataListener());
  }
}

class MyListDataListener implements ListDataListener {
  public void intervalAdded(ListDataEvent evt) {
    DefaultListModel model = (DefaultListModel) evt.getSource();
    int start = evt.getIndex0();
    int end = evt.getIndex1();
    int count = end - start + 1;

    for (int i = start; i <= end; i++) {
      Object item = model.getElementAt(i);
    }
  }
  public void intervalRemoved(ListDataEvent evt) {
    int start = evt.getIndex0();
    int end = evt.getIndex1();
    int count = end - start + 1;
  }
  public void contentsChanged(ListDataEvent evt) {
    DefaultListModel model = (DefaultListModel) evt.getSource();
    int start = evt.getIndex0();
    int end = evt.getIndex1();
    int count = end - start + 1;
    for (int i = start; i <= end; i++) {
      Object item = model.getElementAt(i);
    }
  }
}

Related examples in the same category

1.	Use JList component to display custom objects with ListCellRenderer
2.	An example of JList with a DefaultListModel
3.	Create JList from array of string value
4.	A graphical list selection monitor
5.	Test of the DragGesture classes and JList to see if we can recognize a simple drag gesture
6.	Dual JList with buttons in between
7.	extends ListCellRenderer to display icons
8.	Add JList to Scroll pane
9.	Dual Sample: JList and ComboBox
10.	JList selection changed listener
11.	Triple List from same data array
12.	List with and without ScrollPane
13.	Set visible row count and fixed cell height and width
14.	List: Shared Data Sample
15.	List Data Event Demo
16.	How to use the list component
17.	Create list from list model
18.	How to create list cell renderer
19.	React to list selection action
20.	Construct the list component
21.	Tab list renderer
22.	List with textfield input
23.	Sharing a Model between a JList and JComboBox
24.	Demonstrate Swing ScrollingList
25.	Demonstrate Swing JList ListModel
26.	Weak ListModel
27.	ListModel Demo
28.	ModifyModelSample: ListModel Demo
29.	ArrayList with a ListModel for ease of use
30.	Drag and Drop:JList and List
31.	List selection event
32.	JList is a component that displays a list of objects: It allows the user to select one or more items.
33.	A JTextArea is a multi-line text area that displays plain text.
34.	JTextPane component is an advanced component for working with text.
35.	Model for a JButton: manage only the state of the button
36.	A default button model
37.	JList: ListModel and ListSelectionModel. The ListModel handles data. ListSelectionModel works with the GUI.
38.	A single-selection JList.
39.	Listening for Changes to the Selection in a JList Component
40.	Detecting Double and Triple Clicks on an Item in a JList Component
41.	Arranging Items in a JList Component
42.	changes the layout orientation so that its items are displayed top-to-bottom and left-to-right.
43.	Make the number of visible rows dependent on the height of the list, the visibleRowCount property must be set to 0:
44.	Setting the Selection Mode of a JList Component
45.	The selected items must be in a contiguous range
46.	Multiple ranges of selected items are allowed
47.	Setting the Selected Items in a JList Component
48.	import javax.swing.JList;
49.	Select all the items
50.	Clear all selections
51.	Select the first item
52.	Add another selection - the third item
53.	Deselect the first item
54.	Select a single item
55.	Getting the Selected Items in a JList Component
56.	Get the index of the last selected item
57.	Determine if the third item is selected
58.	Determine if there are any selected items
59.	Return the selected item objects:
60.	Adding and Removing an Item in a JList Component
61.	Append an item
62.	Insert an item at the beginning
63.	Create a list that allows adds and removes
64.	Set method replaces an item
65.	Methods are used to remove items
66.	Getting the Items in a JList Component
67.	Methods are used to find an item:
68.	These methods can be used to find the range of visible items:
69.	Get index of first visible item
70.	Get index of last visible item
71.	Setting a Tool Tip for an Item in a JList Component
72.	Setting the Dimensions of an Item in a JList Component
73.	It is also possible to set the item dimensions using a sample value:
74.	Creating a JList Component
75.	The items can be arbitrary objects. The toString() method of the objects is displayed in the list component.
76.	Determining the Selected JRadioButton in a Button Group
77.	A spinner that rolls from the end of a list to beginning
78.	This program demonstrates the use of cell renderers in a list box
79.	This program demonstrates a simple fixed list of strings
80.	This program demonstrates a list that dynamically computes list entries

Listening for Changes to the Items in a JList Component : List « Swing JFC « Java

Related examples in the same category