private static void HandleItemLeftMouseUp(object sender, MouseButtonEventArgs eventArgs)
{
eventArgs.Handled = false;
if (eventArgs.OriginalSource is TextBox)
{
ListBoxItem textBoxParentItem;
ListBox textBoxParentItemsControl;
if (TextBoxFocusAttachedBehavior.TryFindAttachedElementsParentItem(
eventArgs.OriginalSource as DependencyObject,
out textBoxParentItem) &&
TextBoxFocusAttachedBehavior.TryFindAttachedElementsParentItemsControl(
eventArgs.OriginalSource as DependencyObject,
out textBoxParentItemsControl))
{
textBoxParentItemsControl.SelectedItem = textBoxParentItem.Content;
}
return;
}
// Apply behavior when ListBoxItem is clicked anywhere else but Buttons, Checkboxes, etc
if (eventArgs.OriginalSource is Border)
{
var parentItem = sender as ListBoxItem;
TextBox textBox = TextBoxFocusAttachedBehavior.GetParentItemTextBox(parentItem);
TextBoxFocusAttachedBehavior.ApplyBehaviors(textBox);
}
}
private static bool TryFindAttachedElementsParentItem(DependencyObject attachingElement, out ListBoxItem parentListBoxItem)
{
parentListBoxItem = new ListBoxItem();
ListBox itemsControl;
if (TextBoxFocusAttachedBehavior.TryFindAttachedElementsParentItemsControl(attachingElement, out itemsControl))
{
var parentItem = itemsControl.ItemContainerGenerator.ContainerFromItem(
(attachingElement as FrameworkElement)?.DataContext) as ListBoxItem;
parentListBoxItem = parentItem ?? new ListBoxItem();
return(parentItem != null);
}
return(false);
}
/// <summary>
/// Listen to the parent ListBoxItem's PreviewMouseLeftButtonUp to handle focus behavior. <para/>
/// Using the Selected event or in general the default ListBox selection mechanism <para/>
/// would interfere with other user input (e.g. opening context menu, which involves <para/>
/// the corresponding item to be selected. So stealing the focus in such case leads to odd behavior.)
/// </summary>
/// <param name="attachingElement"></param>
/// <param name="isEnabled"></param>
private static void ObserveAttachedElement(DependencyObject attachingElement, bool isEnabled)
{
ListBox itemsControl;
if (TextBoxFocusAttachedBehavior.TryFindAttachedElementsParentItemsControl(attachingElement, out itemsControl))
{
ListBoxItem item;
if (TextBoxFocusAttachedBehavior.TryFindAttachedElementsParentItem(attachingElement, out item))
{
if (isEnabled)
{
// Ensure to listen to event with only one handler assigned each ItemsControl
if (!TextBoxFocusAttachedBehavior.GetAttachedElementIsRegistered(itemsControl))
{
//LogDocumentKeyboardInputHandler.Navigated += TextBoxFocusAttachedBehavior.HandleFocusOnKeyboardNavigated;
}
// Store the item's attached TextBox for later use with the event handlers
TextBoxFocusAttachedBehavior.SetParentItemTextBox(item, attachingElement as TextBox);
WeakEventManager <UIElement, MouseButtonEventArgs> .AddHandler(
item,
"PreviewMouseLeftButtonUp",
TextBoxFocusAttachedBehavior.HandleItemLeftMouseUp);
TextBoxFocusAttachedBehavior.SetAttachedElementIsRegistered(item, true);
}
else
{
//LogDocumentKeyboardInputHandler.Navigated -= TextBoxFocusAttachedBehavior.HandleFocusOnKeyboardNavigated;
// Release the attached TextBox
TextBoxFocusAttachedBehavior.SetParentItemTextBox(item, null);
WeakEventManager <UIElement, MouseButtonEventArgs> .RemoveHandler(
item,
"PreviewMouseLeftButtonUp",
TextBoxFocusAttachedBehavior.HandleItemLeftMouseUp);
TextBoxFocusAttachedBehavior.SetAttachedElementIsRegistered(item, false);
}
}
}
}
