Beispiel #1
0
        internal void HandleCollapse(TreeViewItemEx container)
        {
            Debug.Assert(container != null);

            // Unselect all collapsed items.
            bool childFocused  = false;
            bool childSelected = false;

            foreach (var childContainer in GetAllContainers(container, true))
            {
                if (childContainer.IsKeyboardFocusWithin)
                {
                    childFocused = true;
                }

                if (childContainer.IsSelected)
                {
                    childSelected             = true;
                    childContainer.IsSelected = false;
                }
            }

            if (childSelected)
            {
                MoveSelection(container);
            }
            else if (childFocused)
            {
                container.FocusWithRetry();
            }
        }
Beispiel #2
0
        private void OnNavigationKey(TreeViewItemEx targetContainer)
        {
            if (targetContainer == null)
            {
                return;
            }

            if (IsControlDown)
            {
                targetContainer.FocusWithRetry();
                targetContainer.BringIntoView();
            }
            else
            {
                MoveSelection(targetContainer);
            }
        }
Beispiel #3
0
        /// <summary>
        /// Invoked whenever an unhandled <see cref="UIElement.GotFocus"/> event reaches this
        /// element in its route.
        /// </summary>
        /// <param name="e">
        /// The <see cref="RoutedEventArgs"/> that contains the event data.
        /// </param>
        protected override void OnGotFocus(RoutedEventArgs e)
        {
            base.OnGotFocus(e);

            // Focus last focused item or first selected item.
            if (_lastFocusedContainer == null)
            {
                var selectedItems = SelectedItems;
                if (selectedItems != null && selectedItems.Count > 0)
                {
                    HandleGotFocus(GetContainer(selectedItems[0]));
                }
            }

            if (_lastFocusedContainer != null)
            {
                _lastFocusedContainer.FocusWithRetry();
            }
            else
            {
                GetFirstContainer(this, true)?.FocusWithRetry();
            }
        }
Beispiel #4
0
        internal void MoveSelection(TreeViewItemEx container)
        {
            Debug.Assert(container != null);

            var selectedItems = SelectedItems;

            if (selectedItems != null)
            {
                var item = container.Item;
                if (selectedItems.Count == 1 && selectedItems[0] == item)
                {
                    // Focused moved back to current and only selected item.
                    _shiftSelectionAnchor = container;
                }
                else if (IsControlDown)
                {
                    // Ctrl-click item toggles selection.
                    if (selectedItems.Contains(item))
                    {
                        selectedItems.Remove(item);
                    }
                    else
                    {
                        selectedItems.Add(item);
                    }

                    _shiftSelectionAnchor = container;
                }
                else if (IsShiftDown && selectedItems.Count > 0)
                {
                    // Shift-click extends selection.
                    var anchorContainer = _shiftSelectionAnchor ?? GetContainer(selectedItems[0]);
                    var rangeItems      = GetRangeItems(this, anchorContainer, container, true);

                    for (int i = selectedItems.Count - 1; i >= 0; i--)
                    {
                        if (!rangeItems.Contains(selectedItems[i]))
                        {
                            selectedItems.RemoveAt(i);
                        }
                    }

                    for (int i = 0; i < rangeItems.Count; i++)
                    {
                        if (!selectedItems.Contains(rangeItems[i]))
                        {
                            selectedItems.Add(rangeItems[i]);
                        }
                    }
                }
                else
                {
                    // Single selection.
                    for (int i = selectedItems.Count - 1; i >= 0; i--)
                    {
                        if (selectedItems[i] != item)
                        {
                            selectedItems.RemoveAt(i);
                        }
                    }

                    if (!selectedItems.Contains(item))
                    {
                        selectedItems.Add(item);
                    }

                    _shiftSelectionAnchor = container;
                }
            }

            container.FocusWithRetry();
            container.BringIntoView();
        }