I have the following ListView:
<ListView Name="listView"><ListView.View><GridView><GridView.ColumnHeaderContainerStyle><Style TargetType="{x:Type GridViewColumnHeader}"><Setter Property="Visibility" Value="Collapsed"/></Style></GridView.ColumnHeaderContainerStyle><GridViewColumn><GridViewColumn.CellTemplate><DataTemplate><StackPanel><CheckBox Margin="0" VerticalAlignment="Center" IsChecked="{Binding IsChecked}" Visibility="{Binding IsChecked, Converter={StaticResource boolToVis}}"></CheckBox></StackPanel></DataTemplate></GridViewColumn.CellTemplate></GridViewColumn><GridViewColumn><GridViewColumn.CellTemplate><DataTemplate><TextBlock Margin="0" Text="{Binding Text}"/></DataTemplate></GridViewColumn.CellTemplate></GridViewColumn></GridView></ListView.View></ListView>The items in the ListView are of the below type:
public class CheckBoxListViewItemSource : INotifyPropertyChanged{ public CheckBoxListViewItemSource(String text) { m_text = text; } public bool IsChecked { get { return m_checked; } set { if (m_checked == value) return; m_checked = value; RaisePropertyChanged("IsChecked"); } } public String Text { get { return m_text; } set { if (m_text == value) return; m_text = value; RaisePropertyChanged("Text"); } } public override string ToString() { return Text; } public event PropertyChangedEventHandler PropertyChanged; private void RaisePropertyChanged(string propName) { PropertyChangedEventHandler eh = PropertyChanged; if (eh != null) { eh(this, new PropertyChangedEventArgs(propName)); } } private bool m_checked; private String m_text;}The visibility of the checkbox in the ListView is bound to the value of IsChecked of the ListViewItem. The converter is a simple bool to visibility converter:
public class BoolToVisibilityConverter : IValueConverter{ public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { if (value is Boolean) { return ((bool)value) ? Visibility.Visible : Visibility.Collapsed; } return value; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); }}In the code behind of the ListView I have:
void listView_SelectionChanged(object sender, SelectionChangedEventArgs e) { foreach (var item in e.RemovedItems) { CheckBoxListViewItemSource source = item as CheckBoxListViewItemSource; source.IsChecked = false; } foreach (var item in e.AddedItems) { CheckBoxListViewItemSource source = item as CheckBoxListViewItemSource; source.IsChecked = true; } }The binding for the checkbox visibility is not working for me. The default IsChecked value is false so the list appears with no checkboxes. If I select an item, the checkbox does not appear.
However, if I set the default value of IsChecked to true, all of the list items appear with a checkbox and if I select an item and then deselect it, the checkbox correctly disappears.
What I am trying to achieve is that all of the items start off with no checkbox, selecting an item displays a checked checkbox, and deselecting an item hides the checkbox.
Any ideas where I am going wrong?
