/// <summary>
/// Sets shortcut</summary>
/// <param name="shortcut">Shortcut keys</param>
/// <param name="info">CommandInfo corresponding to shortcut keys</param>
/// <remarks>Keeps m_shortcuts field, the menu item, and the CommandInfo in sync with regards to shortcuts
/// and ensures that each shortcut is unique</remarks>
protected void SetShortcut(Keys shortcut, CommandInfo info)
{
shortcut = KeysUtil.NumPadToNum(shortcut);
// if shortcut is reserved then do not set it.
if (m_reservedKeys.ContainsKey(shortcut))
{
Outputs.WriteLine(OutputMessageType.Warning, "cannot assign " + KeysUtil.KeysToString(shortcut, true) +
" to " + GetCommandPath(info) + " it is reserved for " + m_reservedKeys[shortcut]);
info.RemoveShortcut(shortcut);
// erase shortcut if exist.
EraseShortcut(shortcut);
return;
}
info.AddShortcut(shortcut);
if (shortcut != Keys.None)
{
// If the shortcut already exists for a different command, then erase the old commands's shortcut.
if (m_shortcuts.ContainsKey(shortcut) &&
m_shortcuts[shortcut] != info.CommandTag)
{
object existingCommandTag = m_shortcuts[shortcut];
if (m_commandsById.ContainsKey(existingCommandTag))
{
CommandInfo existingInfo = m_commandsById[existingCommandTag];
existingInfo.RemoveShortcut(shortcut);
}
}
m_shortcuts[shortcut] = info.CommandTag;
}
}
/// <summary>
/// Handles the PreviewKeyDown event on AdaptedControl, and changes the selection
/// if the user navigates using the keyboard</summary>
/// <param name="sender">Sender</param>
/// <param name="e">Event args</param>
protected virtual void PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
{
Keys keyData = e.KeyData;
Keys modifiers = keyData & Keys.Modifiers;
keyData &= ~Keys.Modifiers;
if (IsNavigationKey(keyData))
{
List <TNode> oldSelection;
// If the user is reversing direction of a past shift+selection, and they didn't
// overshoot the beginning (i.e., the stack isn't empty), then don't search for
// nodes and instead restore a past selection.
if (modifiers == Keys.Shift &&
OppositeNavigationKeys(m_lastKeyWithShift, keyData) &&
m_shiftKeySelectionStack.Count > 0)
{
oldSelection = m_shiftKeySelectionStack.Pop();
ChangeSelection(oldSelection);
return;
}
// We need to know the current selection now.
oldSelection = new List <TNode>(m_selectionContext.SelectionCount);
oldSelection.AddRange(m_selectionContext.GetSelection <TNode>());
// If the user is doing a shift+selection, then push the current selection on to the
// stack. But if the user chose a new direction, clear the stack first.
bool pushOldSelectionIfSelectionChanges = false;
if (modifiers == Keys.Shift)
{
if (m_lastKeyWithShift != Keys.None && m_lastKeyWithShift != keyData)
{
m_lastKeyWithShift = Keys.None;
m_shiftKeySelectionStack.Clear();
}
pushOldSelectionIfSelectionChanges = true;
}
else
{
m_lastKeyWithShift = Keys.None;
m_shiftKeySelectionStack.Clear();
}
// Do a search from the existing selected nodes, looking only along wires.
var connectedNodes = new HashSet <TNode>();
foreach (TNode startElement in m_selectionContext.GetSelection <TNode>())
{
foreach (TNode connectedNode in FindConnectedNodes(startElement, keyData, modifiers))
{
connectedNodes.Add(connectedNode);
}
}
// If no connected nodes were found, then look for the nearest nodes.
if (connectedNodes.Count == 0)
{
foreach (TNode startElement in m_selectionContext.GetSelection <TNode>())
{
TNode nearestNode = FindNearestNode(startElement, keyData, modifiers);
if (nearestNode != null)
{
connectedNodes.Add(nearestNode);
}
}
}
// If we have new connected nodes then change the selection.
if (connectedNodes.Count > 0)
{
// With this keyboard navigation, the Control key doesn't seem to make sense
// for toggling nodes in the selection.
modifiers &= ~Keys.Control;
var newSelection = new HashSet <TNode>(oldSelection);
KeysUtil.Select(newSelection, connectedNodes, modifiers);
if (!newSelection.SetEquals(oldSelection))
{
ChangeSelection(newSelection);
if (pushOldSelectionIfSelectionChanges)
{
m_lastKeyWithShift = keyData;
m_shiftKeySelectionStack.Push(new List <TNode>(oldSelection));
}
// Attempt to pan, to make sure the newly selected nodes are visible
if (m_transformAdapter != null)
{
Rectangle boundingRect = m_pickingAdapter.GetBounds(newSelection.OfType <object>());
m_transformAdapter.PanToRect(boundingRect);
}
}
}
}
}
