public static void SetHasBindableSelectedItems(System.Windows.Controls.ListBox source, bool value)
{
var handler = (SelectionChangedHandler)source.GetValue(SelectionChangedHandlerProperty);
if (value && handler == null)
{
handler = new SelectionChangedHandler(source);
source.SetValue(SelectionChangedHandlerProperty, handler);
}
else if (!value && handler != null)
source.ClearValue(SelectionChangedHandlerProperty);
}
private void Initialize(System.Windows.Controls.ComboBox comboBox, bool useEagerSelection)
{
// Add to visual tree to enable ElementName binding
comboBox.Tag = this._bindingListener;
this._useEagerSelection = useEagerSelection;
BindingExpression be = comboBox.GetBindingExpression(ItemsControl.ItemsSourceProperty);
if (be != null)
{
BindingOperations.SetBinding(this._bindingListener, BindingListener.ItemsSourceProperty, be.ParentBinding);
BindingOperations.SetBinding(comboBox, ItemsControl.ItemsSourceProperty, new Binding("Items") { Source = this });
}
be = comboBox.GetBindingExpression(Selector.SelectedItemProperty);
if (be != null)
{
BindingOperations.SetBinding(this._bindingListener, BindingListener.SelectedItemProperty, be.ParentBinding);
BindingOperations.SetBinding(comboBox, Selector.SelectedItemProperty, new Binding("SelectedItem") { Source = this, Mode = BindingMode.TwoWay });
}
be = comboBox.GetBindingExpression(Selector.SelectedValueProperty);
if (be != null)
{
// We'll always bind the ComboBox to SelectedItem, but we'll map it to the existing SelectedValue binding
this._selectedValueMode = true;
BindingOperations.SetBinding(this._bindingListener, BindingListener.SelectedValueProperty, be.ParentBinding);
comboBox.ClearValue(Selector.SelectedValueProperty);
// Bind SelectedValuePath
be = comboBox.GetBindingExpression(Selector.SelectedValuePathProperty);
if (be != null)
{
BindingOperations.SetBinding(this._bindingListener, BindingListener.SelectedValuePathProperty, be.ParentBinding);
comboBox.ClearValue(Selector.SelectedValuePathProperty);
}
else
{
this._bindingListener.SelectedValuePath = comboBox.SelectedValuePath;
comboBox.SelectedValuePath = null;
}
// Bind DisplayMemberPath
be = comboBox.GetBindingExpression(Selector.DisplayMemberPathProperty);
if (be != null)
{
BindingOperations.SetBinding(this._bindingListener, BindingListener.DisplayMemberPathProperty, be.ParentBinding);
}
else
{
this._bindingListener.DisplayMemberPath = comboBox.DisplayMemberPath;
}
BindingOperations.SetBinding(comboBox, Selector.DisplayMemberPathProperty, new Binding("DisplayMemberPath") { Source = this });
// Check selection mode and path properties
if (this._useEagerSelection && (this._bindingListener.DisplayMemberPath != this._bindingListener.SelectedValuePath))
{
throw new InvalidOperationException("Cannot use eager selection when the DisplayMemberPath and the SelectedValuePath differ. Try using basic ComboBoxMode.Async selection instead.");
}
BindingOperations.SetBinding(comboBox, Selector.SelectedItemProperty, new Binding("SelectedItem") { Source = this, Mode = BindingMode.TwoWay });
}
}
