/// <summary>
/// Notifies the
/// <see cref="T:System.Windows.Controls.AutoCompleteBox" /> that the
/// <see cref="P:System.Windows.Controls.AutoCompleteBox.ItemsSource" />
/// property has been set and the data can be filtered to provide
/// possible matches in the drop-down.
/// </summary>
/// <remarks>
/// Call this method when you are providing custom population of
/// the drop-down portion of the AutoCompleteBox, to signal the control
/// that you are done with the population process.
/// Typically, you use PopulateComplete when the population process
/// is a long-running process and you want to cancel built-in filtering
/// of the ItemsSource items. In this case, you can handle the
/// Populated event and set PopulatingEventArgs.Cancel to true.
/// When the long-running process has completed you call
/// PopulateComplete to indicate the drop-down is populated.
/// </remarks>
public void PopulateComplete()
{
// Apply the search filter
RefreshView();
// Fire the Populated event containing the read-only view data.
#if SILVERLIGHT
PopulatedEventArgs populated = new PopulatedEventArgs(new ReadOnlyCollection<object>(_view));
#else
PopulatedEventArgs populated = new PopulatedEventArgs(new ReadOnlyCollection<object>(_view), PopulatedEvent);
#endif
OnPopulated(populated);
if (SelectionAdapter != null && SelectionAdapter.ItemsSource != _view)
{
SelectionAdapter.ItemsSource = _view;
}
bool isDropDownOpen = _userCalledPopulate && (_view.Count > 0);
if (isDropDownOpen != IsDropDownOpen)
{
_ignorePropertyChange = true;
IsDropDownOpen = isDropDownOpen;
}
if (IsDropDownOpen)
{
OpeningDropDown(false);
if (DropDownPopup != null)
{
DropDownPopup.Arrange();
}
}
else
{
ClosingDropDown(true);
}
UpdateTextCompletion(_userCalledPopulate);
}
/// <summary>
/// Raises the
/// <see cref="E:System.Windows.Controls.AutoCompleteBox.Populated" />
/// event.
/// </summary>
/// <param name="e">A
/// <see cref="T:System.Windows.Controls.PopulatedEventArgs" />
/// that contains the event data.</param>
protected virtual void OnPopulated(PopulatedEventArgs e)
{
#if SILVERLIGHT
PopulatedEventHandler handler = Populated;
if (handler != null)
{
handler(this, e);
}
#else
RaiseEvent(e);
#endif
}
/// <summary>
/// Notifies AutoCompleteBox that ItemsSource has been populated and
/// suggestions can now be computed using that data.
/// </summary>
/// <remarks>
/// Allows a developer to continue the population event after setting
/// the Cancel property to True. This allows for custom,
/// developer-driven AutoCompleteBox scenarios.
/// </remarks>
public void PopulateComplete()
{
// Apply the search filter
RefreshView();
// Fire the Populated event containing the read-only view data.
PopulatedEventArgs populated = new PopulatedEventArgs(new ReadOnlyCollection<object>(View));
OnPopulated(populated);
if (SelectionAdapter != null && SelectionAdapter.ItemsSource != View)
{
SelectionAdapter.ItemsSource = View;
}
IsDropDownOpen = UserCalledPopulate && (View.Count > 0);
if (IsDropDownOpen)
{
ArrangePopup();
}
UpdateTextCompletion(UserCalledPopulate);
}
/// <summary>
/// Raises the
/// <see cref="E:System.Windows.Controls.AutoCompleteBox.Populated" />
/// event.
/// </summary>
/// <param name="e">A
/// <see cref="T:System.Windows.Controls.PopulatedEventArgs" />
/// that contains the event data.</param>
protected virtual void OnPopulated(PopulatedEventArgs e)
{
PopulatedEventHandler handler = Populated;
if (handler != null)
{
handler(this, e);
}
}
//highlighting logic
protected override void OnPopulated(PopulatedEventArgs e)
{
base.OnPopulated(e);
ListBox listBox = GetTemplateChild("Selector") as ListBox;
if (listBox != null)
{
//highlight the selected item, if any
if (this.ItemsSource!=null && this.SelectedItem != null)
{
listBox.SelectedItem = this.SelectedItem;
listBox.Dispatcher.BeginInvoke(delegate
{
listBox.UpdateLayout();
listBox.ScrollIntoView(listBox.SelectedItem);
//listBox.UpdateLayout();
});
}
}
}