javaswingjlistlistcellrenderer
rows added selected by default after selecting two rows
Taking this example by mKorbel as an example:
I have achieved creating the desired behavior by using the mechanisms suggested by mKorbel. This works as long as I have one row painted green (unselected). However if I add one row, select it and then add a new row, it works fine, I get a new unselected row. If I add a second row and I selected then it is painted red correctly, but upon adding more rows after the second row (two red rows) they are all selected by default, and that is not what I want. I want all the rows in green until I click on them (double click). Does anyone know why is this happening? Why does it work as long as I have 1 cell unselected? why if, I have more than two or all the, rows selected, it keeps adding new rows in selected mode? THNX
My code for the mouse event is as follows:
m_list = new JList<String>(m_listModel)
{
private MyCellRenderer cellRenderer = new MyCellRenderer();
// emulate control down for multiple non contiguous selection on the
// list.
@Override
// TODO fix here
public void processMouseEvent(MouseEvent event) {
int modifiers = event.getModifiers() | InputEvent.CTRL_MASK;
m_myME = new MouseEvent((Component) event.getSource(),
event.getID(), event.getWhen(), modifiers,
event.getX(), event.getY(), event.getXOnScreen(),
event.getYOnScreen(), event.getClickCount(),
event.isPopupTrigger(), event.getButton());
//if clicked twice
if (event.getClickCount() == 2) {
//if the flag is set to true consume event
if ((MyCellRenderer.getFlag() == true)) {
m_urlName = MyCellRenderer.getValue();
m_myME.consume();
//initiate parsing
initiateParsing();
}else{
m_urlName = MyCellRenderer.getValue();
}
//if it is not consume it will emulate CTRL_MASK
if (!m_myME.isConsumed()) {
super.processMouseEvent(m_myME);
m_urlName = MyCellRenderer.getValue();
//initiate parsing process
initiateParsing();
}
}
}
};
The code in the CellRenderer is as follows:
public static class MyCellRenderer extends JLabel implements
ListCellRenderer {
private static final long serialVersionUID = 1L;
private static boolean myFlag = false;
private static String thisValue;
public MyCellRenderer() {
setOpaque(true);
}
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
setText(value.toString());
Color background = null;
Color foreground = null;
if (isSelected == true) {
background = Color.RED;
foreground = Color.WHITE;
myFlag = true;
} else {
background = Color.GREEN;
foreground = Color.BLACK;
myFlag = false;
}
setBackground(background);
setForeground(foreground);
public static class MyCellRenderer extends JLabel implements
ListCellRenderer {
private static final long serialVersionUID = 1L;
private static boolean myFlag = false;
private static String thisValue;
public MyCellRenderer() {
setOpaque(true);
}
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
setText(value.toString());
Color background = null;
Color foreground = null;
if (isSelected == true) {
background = Color.RED;
foreground = Color.WHITE;
myFlag = true;
} else {
background = Color.GREEN;
foreground = Color.BLACK;
myFlag = false;
}
setBackground(background);
setForeground(foreground);
// the string where its pointing at
thisValue = value.toString();
m_index = index;
return this;
}
public static boolean getFlag() {
return myFlag;
}
public static String getValue() {
return thisValue;
}
}
Solution
as I commneted in your previous question, you can use
MouseEvent.consume()but not inXxxRenderer(I don't want to comment something) selection must be stored in
XxxModel, otherwise everything attemps are wrong or in better case are caused by another side effectsfor example, by using
model_to_view, ....DefaultListSelectionModel
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class JListDisabledItemDemo implements ItemListener, Runnable {
private JFrame f = new JFrame("Colors");
private static final String ITEMS[] = {" black ", " blue ", " green ",
" orange ", " purple ", " red ", " white ", " yellow "};
private JList jList;
private JCheckBox[] checkBoxes;
private boolean[] enabledFlags;
@Override
public void run() {
JPanel pnlEnablers = new JPanel(new GridLayout(0, 1));
pnlEnablers.setBorder(BorderFactory.createTitledBorder("Enabled Items"));
checkBoxes = new JCheckBox[ITEMS.length];
enabledFlags = new boolean[ITEMS.length];
for (int i = 0; i < ITEMS.length; i++) {
checkBoxes[i] = new JCheckBox(ITEMS[i]);
checkBoxes[i].setSelected(true);
checkBoxes[i].addItemListener(this);
enabledFlags[i] = true;
pnlEnablers.add(checkBoxes[i]);
}
jList = new JList(ITEMS);
jList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
jList.setSelectionModel(new DisabledItemSelectionModel());
jList.setCellRenderer(new DisabledItemListCellRenderer());
jList.addListSelectionListener(new ListSelectionListener() {
@Override
public void valueChanged(ListSelectionEvent e) {
if (!e.getValueIsAdjusting()) {
System.out.println("selection");
}
}
});
JScrollPane scroll = new JScrollPane(jList);
scroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
Container contentPane = f.getContentPane();
contentPane.setLayout(new GridLayout(1, 2));
contentPane.add(pnlEnablers);
contentPane.add(scroll);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setLocation(240, 280);
UIManager.put("List.background", Color.lightGray);
UIManager.put("List.selectionBackground", Color.orange);
UIManager.put("List.selectionForeground", Color.blue);
UIManager.put("Label.disabledForeground", Color.magenta);
SwingUtilities.updateComponentTreeUI(f);
f.pack();
javax.swing.SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
f.setVisible(true);
}
});
}
@Override
public void itemStateChanged(ItemEvent event) {
JCheckBox checkBox = (JCheckBox) event.getSource();
int index = -1;
for (int i = 0; i < ITEMS.length; i++) {
if (ITEMS[i].equals(checkBox.getText())) {
index = i;
break;
}
}
if (index != -1) {
enabledFlags[index] = checkBox.isSelected();
jList.repaint();
}
}
public static void main(String args[]) {
SwingUtilities.invokeLater(new JListDisabledItemDemo());
}
private class DisabledItemListCellRenderer extends DefaultListCellRenderer {
private static final long serialVersionUID = 1L;
@Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
Component comp = super.getListCellRendererComponent(list, value, index, false, false);
JComponent jc = (JComponent) comp;
if (enabledFlags[index]) {
if (isSelected & cellHasFocus) {
comp.setForeground(Color.black);
comp.setBackground(Color.red);
} else {
comp.setForeground(Color.blue);
}
if (!isSelected) {
if ((value.toString()).trim().equals("yellow")) {
comp.setForeground(Color.orange);
comp.setBackground(Color.magenta);
}
}
return comp;
}
comp.setEnabled(false);
return comp;
}
}
private class DisabledItemSelectionModel extends DefaultListSelectionModel {
private static final long serialVersionUID = 1L;
@Override
public void setSelectionInterval(int index0, int index1) {
if (enabledFlags[index0]) {
super.setSelectionInterval(index0, index0);
} else {
/*
* The previously selected index is before this one,
* so walk forward to find the next selectable item.
*/
if (getAnchorSelectionIndex() < index0) {
for (int i = index0; i < enabledFlags.length; i++) {
if (enabledFlags[i]) {
super.setSelectionInterval(i, i);
return;
}
}
} /*
* Otherwise, walk backward to find the next selectable item.
*/ else {
for (int i = index0; i >= 0; i--) {
if (enabledFlags[i]) {
super.setSelectionInterval(i, i);
return;
}
}
}
}
}
}
}
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