/// <summary>
/// Called before the <see cref="E:System.Windows.UIElement.MouseLeftButtonUp" /> event occurs.
/// </summary>
/// <param name="e">The data for the event.</param>
/// <exception cref="System.ArgumentNullException">e</exception>
protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
{
if (_destConnectorControl != null)
{
_destConnectorControl.ShowNotification = false;
_destConnectorControl = null;
}
base.OnMouseLeftButtonUp(e);
if (e == null) throw new ArgumentNullException("e");
var panel = DiagramPanel.GetParentPanel<DiagramPanel>(this);
panel.Cursor = Cursors.Arrow;
var connectionStart = DataContext as IDiagramItemViewModel;
if (connectionStart != null)
{
var connectionEnd = panel.GetViewModelByLocation<IDiagramItemViewModel>(e.GetPosition(Application.Current.RootVisual));
var sourceItem = connectionStart;
var destinationItem = connectionEnd;
var connector = DataContext as IConnectorViewModel;
if (connector != null)
{
connector.IsConnectionCandidate = false;
sourceItem = connector.ConnectorType == ConnectorType.In ? connectionEnd : connectionStart;
destinationItem = connector.ConnectorType == ConnectorType.In ? connectionStart : connectionEnd;
}
if (_connectorCandidate != null)
{
_connectorCandidate.IsConnectionCandidate = false;
_connectorCandidate = null;
}
var panelVM = panel.DataContext as DiagramViewModel;
if (_isDragging && sourceItem != null && destinationItem != null && panelVM != null &&
sourceItem.CanConnectTo(destinationItem, panelVM.Items).CanConnect)
{
var newConnection = sourceItem.CreateConnectionTo(destinationItem);
if (newConnection != null)
{
panelVM.Items.Add(newConnection);
sourceItem.ConnectTo(destinationItem);
}
}
}
CancelLink(panel);
_isDragging = false;
ReleaseMouseCapture();
}
/// <summary>
/// Called before the <see cref="E:System.Windows.UIElement.MouseMove" /> event occurs.
/// </summary>
/// <param name="e">The data for the event.</param>
/// <exception cref="System.ArgumentNullException">e</exception>
protected override void OnMouseMove(MouseEventArgs e)
{
if (e == null) throw new ArgumentNullException("e");
if (!_isDragging)
{
if (DataContext is IConnectorViewModel)
{
((IConnectorViewModel)DataContext).IsConnectionCandidate = true;
}
}
if (_isDragging && _line != null)
{
var panel = DiagramPanel.GetParentPanel<DiagramPanel>(this);
var position = e.GetPosition(panel);
_line.X2 = position.X;
_line.Y2 = position.Y;
panel.Cursor = Cursors.Wait;
var sourceItem = DataContext as IDiagramItemViewModel;
if (sourceItem != null)
{
var panelVM = (DiagramViewModel)panel.DataContext;
var destinationItem = panel.GetViewModelByLocation<IDiagramItemViewModel>(e.GetPosition(Application.Current.RootVisual));
if (destinationItem != null && panelVM != null && sourceItem.CanConnectTo(destinationItem, panelVM.Items).CanConnect)
{
panel.Cursor = Cursors.Arrow;
}
var item = destinationItem as IConnectorViewModel;
if (item != null)
{
if (panelVM != null)
{
var connectivity = sourceItem.CanConnectTo(item, panelVM.Items);
if (connectivity.CanConnect)
{
var destConnector = item;
destConnector.IsConnectionCandidate = true;
_destConnectorCandidate = destConnector;
// HINT: need this because of weird behavior
// when mouse pointer is over connector and IsConnectionCandidate set to true
// previous line dissapears, thought it is still in panel.Children and all properties are set correctly
RecreateLine(panel, destConnector.Left, destConnector.Top);
}
else
{
panel.Cursor = Cursors.Wait;
var targetConnector = panel.GetDataBoundViewByLocation<IDiagramItemViewModel, ConnectorThumb>(e.GetPosition(Application.Current.RootVisual));
if (targetConnector != null)
{
targetConnector.NotificationMessage = connectivity.JustificationMessage;
_destConnectorControl = targetConnector;
}
}
}
else
{
//((IConnectorViewModel)destinationItem).IsConnectionCandidate = false;
panel.Cursor = Cursors.Wait;
}
}
else
{
if (_destConnectorControl != null)
{
_destConnectorControl.ShowNotification = false;
_destConnectorControl = null;
}
if (_destConnectorCandidate != null)
{
_destConnectorCandidate.IsConnectionCandidate = false;
_destConnectorCandidate = null;
Dispatcher.BeginInvoke(() => RecreateLine(panel, position.X, position.Y));
}
}
}
}
}
