private static bool CheckQuickAccessKey(KeyEventArgs e)
{
if (elements == null || elements.Count == 0)
{
return(false);
}
string c = new KeyConverter().ConvertToInvariantString(e.Key);
keySequence += c;
FrameworkElement match = null;
List <FrameworkElement> filtered = new List <FrameworkElement>();
foreach (FrameworkElement child in elements)
{
string key = KeyTip.GetKey(child);
if (keySequence.Equals(key, StringComparison.InvariantCultureIgnoreCase))
{
match = child;
break;
}
if (key.StartsWith(keySequence, StringComparison.InvariantCultureIgnoreCase))
{
filtered.Add(child);
}
}
if (match != null)
{
keySequence = null;
//Remove the key tips befor executing, since another window might be opened and thus the key tips would be desturbing:
HideQuickAccessKeys();
ExecuteElement(match);
if (KeyTip.GetStop(match))
{
// ensure the matched element to be measured:
match.UpdateLayout();
ShowQuickAccessKeys(match);
}
else
{
HideQuickAccessKeys();
}
return(true);
}
if (filtered.Count > 0)
{
elements = filtered;
ShowKeys(elements);
return(true);
}
else
{
return(false);
}
}
private static void ShowKeys(List <FrameworkElement> elements)
{
CloseQuickAccessKeys();
popups = new List <Popup>();
foreach (var e in elements)
{
double yOffset = KeyTip.GetYOffset(e);
double xOffset = KeyTip.GetXOffset(e);
if (xOffset < 0.0)
{
xOffset = e.ActualWidth + xOffset;
}
if (yOffset < 0.0)
{
yOffset = e.ActualHeight + yOffset;
}
if (double.IsNaN(yOffset))
{
yOffset = e.ActualHeight - 16;
}
if (double.IsNaN(xOffset))
{
xOffset = 12;
}
string key = KeyTip.GetKey(e);
Popup popup = new Popup();
popup.AllowsTransparency = true;
popup.Child = new KeyTip()
{
Text = key
};
popup.PlacementTarget = e;
popup.Placement = PlacementMode.Relative;
popup.HorizontalOffset = xOffset;
popup.VerticalOffset = yOffset;
popup.StaysOpen = true;
popups.Add(popup);
popup.IsOpen = true;
}
}
/// <summary>
/// Don't call this directly, it is only used in GatherChildElements.
/// </summary>
private static void GatherElements(List <FrameworkElement> elements, FrameworkElement root)
{
if (root.Visibility != Visibility.Visible || root.IsEnabled == false)
{
return;
}
string key = KeyTip.GetKey(root);
if (key != null)
{
elements.Add(root);
}
if (key == null || !KeyTip.GetStop(root))
{
foreach (var o in LogicalTreeHelper.GetChildren(root))
{
FrameworkElement e = o as FrameworkElement;
if (e != null)
{
GatherElements(elements, e);
}
}
}
}
