/// <summary>
/// Fires <see cref="ItemsChanging" /> event.
/// </summary>
/// <param name="index">Index of item being changed.</param>
/// <param name="e">Object containing event data.</param>
protected virtual void OnItemsChanging(int index, GenericChangeEventArgs <BarItem> e)
{
if (ItemsChanging != null)
{
ItemsChanging(index, e);
}
}
/// <summary>
/// Performs additional custom processes before setting a value in the <see cref="T:System.Collections.CollectionBase"></see> instance.
/// </summary>
/// <param name="index">The zero-based index at which oldValue can be found.</param>
/// <param name="oldValue">The value to replace with newValue.</param>
/// <param name="newValue">The new value of the element at index.</param>
protected override void OnSet(int index, object oldValue, object newValue)
{
var e = new GenericChangeEventArgs <T>((T)oldValue, (T)newValue);
if (Changing != null)
{
Changing(index, e);
if (e.Cancel)
{
return;
}
}
base.OnSet(index, oldValue, newValue);
}
/// <summary>
/// Fires <see cref="SelectionChanged" /> event
/// </summary>
/// <param name="e">Object containing event data.</param>
protected virtual void OnSelectionChanging(GenericChangeEventArgs <BarItem> e)
{
if (SelectionChanging != null)
{
int indx = -1;
for (int i = 0; i < Items.Count; i++)
{
if (e.NewValue.Equals(Items[i]))
{
indx = i;
break;
}
}
SelectionChanging(indx, e);
}
}
/// <summary>
/// Called when [select item].
/// </summary>
/// <param name="item">The item.</param>
/// <param name="value">if set to <c>true</c> [value].</param>
/// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns>
internal bool OnSelectItem(BarItem item, bool value)
{
if (value)
{
var e2 = new GenericChangeEventArgs <BarItem>(SelectedItem, item);
OnSelectionChanging(e2);
if (e2.Cancel)
{
return(false);
}
for (var i = 0; i < items.Count; i++)
{
if (items[i] != item && items[i].Selected)
{
items[i].Selected = false;
}
}
var e = new GenericEventArgs <BarItem>(item);
OnSelectionChanged(e);
return(true);
}
return(false);
}
/// <summary>
/// Called when [selection changing].
/// </summary>
/// <param name="index">The index.</param>
/// <param name="e">The e.</param>
private void OnSelectionChanging(int index, GenericChangeEventArgs <BarItem> e)
{
e.Cancel = true;
}