/// <summary>
/// Handles the KeyDown event for ButtonBase.
/// </summary>
/// <param name="key">
/// The keyboard key associated with the event.
/// </param>
/// <returns>True if the event was handled, false otherwise.</returns>
/// <remarks>
/// This method exists for the purpose of unit testing since we can't
/// set KeyEventArgs.Key to simulate key press events.
/// </remarks>
internal virtual bool OnKeyDownInternal(Key key)
{
// True if the button will handle the event, false otherwise.
bool handled = false;
// Key presses can be ignored when disabled or in ClickMode.Hover
if (IsEnabled && (ClickMode != ClickMode.Hover))
{
// Hitting the SPACE key is equivalent to pressing the mouse
// button
if (key == Key.Space)
{
// Ignore the SPACE key if we already have the mouse
// captured
if (!_isMouseCaptured)
{
_isSpaceKeyDown = true;
IsPressed = true;
CaptureMouseInternal();
if (ClickMode == ClickMode.Press)
{
OnClick();
}
handled = true;
}
}
// The ENTER key forces a click
else if ((key == Key.Enter) && KeyboardNavigation.GetAcceptsReturn(this))
{
_isSpaceKeyDown = false;
IsPressed = false;
ReleaseMouseCaptureInternal();
OnClick();
handled = true;
}
// Any other keys pressed are irrelevant
else if (_isSpaceKeyDown)
{
IsPressed = false;
_isSpaceKeyDown = false;
ReleaseMouseCaptureInternal();
}
}
return(handled);
}
private void OnKeyDown(object sender, KeyEventArgs e)
{
switch (e.Key)
{
case Key.Space:
{
CycleNext();
e.Handled = true;
break;
}
case Key.Enter:
{
if (KeyboardNavigation.GetAcceptsReturn(this))
{
CycleNext();
e.Handled = true;
}
break;
}
case Key.Left:
{
if (Index > 0)
{
--SelectedIndex;
}
e.Handled = true;
break;
}
case Key.Right:
{
if (Index < LastIndex)
{
++SelectedIndex;
}
e.Handled = true;
break;
}
}
}
protected override void OnKeyDown(KeyEventArgs e)
{
if (!e.Handled)
{
bool handled = false;
int newFocusedIndex = -1;
switch (e.Key)
{
case Key.Space:
case Key.Enter:
if ((Key.Enter != e.Key) || KeyboardNavigation.GetAcceptsReturn(this))
{
if (ModifierKeys.Alt != (Keyboard.Modifiers & (ModifierKeys.Control | ModifierKeys.Alt)))
{
// KeyEventArgs.OriginalSource (used by WPF) isn't available in Silverlight; use FocusManager.GetFocusedElement instead
ListBoxItem listBoxItem = FocusManager.GetFocusedElement() as ListBoxItem;
if (null != listBoxItem)
{
if ((ModifierKeys.Control == (Keyboard.Modifiers & ModifierKeys.Control)) && listBoxItem.IsSelected)
{
SelectedItem = null;
}
else
{
SelectedItem = ItemContainerGenerator.ItemFromContainer(listBoxItem);
}
handled = true;
}
}
}
break;
case Key.Home:
newFocusedIndex = 0;
break;
case Key.End:
newFocusedIndex = Items.Count - 1;
break;
case Key.PageUp:
newFocusedIndex = NavigateByPage(false);
break;
case Key.PageDown:
newFocusedIndex = NavigateByPage(true);
break;
case Key.Left:
if (IsVerticalOrientation())
{
ElementScrollViewerScrollInDirection(Key.Left);
}
else
{
newFocusedIndex = _focusedIndex - 1;
}
break;
case Key.Up:
if (IsVerticalOrientation())
{
newFocusedIndex = _focusedIndex - 1;
}
else
{
ElementScrollViewerScrollInDirection(Key.Up);
}
break;
case Key.Right:
if (IsVerticalOrientation())
{
ElementScrollViewerScrollInDirection(Key.Right);
}
else
{
newFocusedIndex = _focusedIndex + 1;
}
break;
case Key.Down:
if (IsVerticalOrientation())
{
newFocusedIndex = _focusedIndex + 1;
}
else
{
ElementScrollViewerScrollInDirection(Key.Down);
}
break;
// case Key.Divide: // Feature only used by SelectionMode.Extended
// case Key.Oem2: // Key not supported by Silverlight
// break;
// case Key.Oem5: // Key not supported by Silverlight
// break;
default:
Debug.Assert(!handled);
break;
}
if ((-1 != newFocusedIndex) &&
(-1 != _focusedIndex) &&
(newFocusedIndex != _focusedIndex) &&
(0 <= newFocusedIndex) &&
(newFocusedIndex < Items.Count))
{
// A key press will change the focused ListBoxItem
ListBoxItem listBoxItem = (ListBoxItem)ItemContainerGenerator.ContainerFromIndex(newFocusedIndex);
Debug.Assert(null != listBoxItem);
ScrollIntoView(ItemContainerGenerator.ItemFromContainer(listBoxItem));
if ((Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
{
listBoxItem.Focus();
}
else
{
SelectedItem = ItemContainerGenerator.ItemFromContainer(listBoxItem);
}
handled = true;
}
if (handled)
{
e.Handled = true;
}
}
}