コード例 #1
0
        /// <inheritdoc/>
        protected override void OnKeyDown(KeyboardDevice device, Key key, ModifierKeys modifiers, RoutedEventData data)
        {
            switch (key)
            {
            case Key.Space:
            case Key.Return:
                if (key == Key.Return && !GetValue <Boolean>(KeyboardNavigation.AcceptsReturnProperty))
                {
                    break;
                }

                var listBoxItem = ItemsControlUtil.FindContainer <ListBoxItem>(this, data.OriginalSource);
                if (listBoxItem != null)
                {
                    HandleItemClicked(listBoxItem);
                    data.Handled = true;
                }
                break;

            case Key.Left:
                PART_ScrollViewer?.LineLeft();
                data.Handled = true;
                break;

            case Key.Right:
                PART_ScrollViewer?.LineRight();
                data.Handled = true;
                break;

            case Key.Up:
                if (SelectionMode == SelectionMode.Single)
                {
                    MoveSelectedItem(FocusNavigationDirection.Up, modifiers);
                }
                data.Handled = true;
                break;

            case Key.Down:
                if (SelectionMode == SelectionMode.Single)
                {
                    MoveSelectedItem(FocusNavigationDirection.Down, modifiers);
                }
                data.Handled = true;
                break;

            case Key.Home:
                var firstItem = ItemsControlUtil.GetFirstItem <ListBoxItem>(this, PART_ScrollViewer);
                if (firstItem != null && firstItem.Focus())
                {
                    HandleItemClickedAndScrollIntoView(firstItem);
                }
                data.Handled = true;
                break;

            case Key.End:
                var lastItem = ItemsControlUtil.GetLastItem <ListBoxItem>(this, PART_ScrollViewer);
                if (lastItem != null && lastItem.Focus())
                {
                    HandleItemClickedAndScrollIntoView(lastItem);
                }
                data.Handled = true;
                break;

            case Key.PageUp:
                var pageUpTarget = ItemsControlUtil.GetPageUpNext <ListBoxItem>(this, PART_ScrollViewer);
                if (pageUpTarget != null && pageUpTarget.Focus())
                {
                    HandleItemClickedAndScrollIntoView(pageUpTarget, false);
                }
                data.Handled = true;
                break;

            case Key.PageDown:
                var pageDownTarget = ItemsControlUtil.GetPageDownNext <ListBoxItem>(this, PART_ScrollViewer);
                if (pageDownTarget != null && pageDownTarget.Focus())
                {
                    HandleItemClickedAndScrollIntoView(pageDownTarget, false);
                }
                data.Handled = true;
                break;
            }

            base.OnKeyDown(device, key, modifiers, data);
        }
コード例 #2
0
        /// <summary>
        /// Handles <see cref="Keyboard.KeyDownEvent"/> when the drop down is open.
        /// </summary>
        private void OnKeyDown_DropDownOpen(KeyboardDevice device, Key key, ModifierKeys modifiers, RoutedEventData data)
        {
            switch (key)
            {
            case Key.Tab:
                PerformTabNavigation(key, modifiers);
                data.Handled = true;
                break;

            case Key.Escape:
                IsDropDownOpen = false;
                data.Handled   = true;
                break;

            case Key.Return:
                SelectFocusedItem();
                IsDropDownOpen = false;
                data.Handled   = true;
                break;

            case Key.Up:
                MoveItemFocus(-1);
                data.Handled = true;
                break;

            case Key.Down:
                MoveItemFocus(1);
                data.Handled = true;
                break;

            case Key.PageUp:
                var pageUpTarget = ItemsControlUtil.GetPageUpNext <ComboBoxItem>(this, PART_ScrollViewer);
                if (pageUpTarget != null && pageUpTarget.Focus())
                {
                    ItemsControlUtil.ScrollItemIntoView <ComboBoxItem>(this, PART_ScrollViewer, pageUpTarget, false);
                }
                data.Handled = true;
                break;

            case Key.PageDown:
                var pageDownTarget = ItemsControlUtil.GetPageDownNext <ComboBoxItem>(this, PART_ScrollViewer);
                if (pageDownTarget != null && pageDownTarget.Focus())
                {
                    ItemsControlUtil.ScrollItemIntoView <ComboBoxItem>(this, PART_ScrollViewer, pageDownTarget, false);
                }
                data.Handled = true;
                break;

            case Key.Home:
                var firstItem = ItemsControlUtil.GetFirstItem <ComboBoxItem>(this, PART_ScrollViewer);
                if (firstItem != null && firstItem.Focus())
                {
                    ItemsControlUtil.ScrollItemIntoView <ComboBoxItem>(this, PART_ScrollViewer, firstItem);
                }
                data.Handled = true;
                break;

            case Key.End:
                var lastItem = ItemsControlUtil.GetLastItem <ComboBoxItem>(this, PART_ScrollViewer);
                if (lastItem != null && lastItem.Focus())
                {
                    ItemsControlUtil.ScrollItemIntoView <ComboBoxItem>(this, PART_ScrollViewer, lastItem);
                }
                data.Handled = true;
                break;

            case Key.Left:
                PART_ScrollViewer?.LineLeft();
                data.Handled = true;
                break;

            case Key.Right:
                PART_ScrollViewer?.LineRight();
                data.Handled = true;
                break;
            }
        }