// Handler for element selection on the canvas providing resizing adorner
void myCanvas_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
// Remove selection on clicking anywhere the window
if (selected)
{
selected = false;
if (selectedElement != null && aLayer.GetAdorners(selectedElement) != null)
{
// Remove the adorner from the selected element
aLayer.Remove(aLayer.GetAdorners(selectedElement)[0]);
selectedElement = null;
}
}
//If adding a new link
if (e.Source.GetType() == typeof(SystemBasicView))
{
if (e.Source.GetType() == typeof(SystemBasicView) && _isAddNewLink)
{
if (!_isLinkStarted)
{
if (_link == null || _link.EndPoint != _link.StartPoint)
{
_isLinkStarted = true;
_linkedSystem = e.Source as SystemBasicView;
SystemViewModel svm = (_linkedSystem.DataContext) as SystemViewModel;
_tempLink = new TemporaryConnectorViewModel(svm);
_tempLink.StartPostion = _linkedSystem.Position;
e.Handled = true;
}
}
}
// If a componentView is selected, add adorner layer to it
else
{
_isDown = true;
_startPoint = e.GetPosition(myCanvas);
selectedElement = e.Source as UIElement;
_originalPoint = selectedElement.TranslatePoint(new Point(0, 0), myCanvas);
aLayer = AdornerLayer.GetAdornerLayer(selectedElement);
aLayer.Add(new ResizingAdorner(selectedElement, myCanvas));
selected = true;
e.Handled = true;
}
}
}
//added to ComponentSelected Event when Link button is clicked
public void StartTempConnector(ComponentViewModel start, EventArgs e)
{
//Create temporary connector for visual display
TemporaryConnectorViewModel temp = new TemporaryConnectorViewModel(start as SystemViewModel);
ComponentVMs.Add(temp);
//remove handler from event to prevent being called again
ComponentSelected -= StartTempConnector;
//create event handler closure to remember start
ComponentSelectionHandler h = null;
h = (end, args) =>
{
//create real connector with remembered start and new end
CreateConnector(start as SystemViewModel, end as SystemViewModel);
//remove h so not called again
ComponentSelected -= h;
//remove temporary connector
ComponentVMs.Remove(temp);
};
//add anonymous event handler "h" to ComponentSelected
ComponentSelected += h;
}
// Handler for drag stopping on user choise
void DragFinishedMouseHandler(object sender, MouseButtonEventArgs e)
{
if(e.Source.GetType() == typeof(SystemBasicView))
{
if (_tempLink != null)
{
SystemBasicView targetSystem = e.Source as SystemBasicView;
SystemViewModel s = (targetSystem.DataContext) as SystemViewModel;
_tempLink.End = s;
_tempLink.EndPosition = e.GetPosition(this);
Mouse.OverrideCursor = null;
_isAddNewLink = false;
_isLinkStarted = false;
_context.ComponentVMs.Add(_tempLink);
_tempLink = null;
e.Handled = true;
}
}
StopDragging();
e.Handled = true;
}
