/// <summary>
/// Draws an providen component to the canvas
/// </summary>
/// <param name="components"></param>
private void DrawComponents(List <WorkflowComponent> components)
{
if (components.Count > 0)
{
CorrectLeftAndTop(components);
editorCanvas.Height = components.Max(component => component.Y) + 60;
editorCanvas.Width = components.Max(component => component.X) + 100;
}
foreach (var component in components)
{
var item = new WorkflowComponentUserControl(component);
item.MouseLeftButtonDown += StartDragging;
item.MouseLeftButtonUp += FinishMoving;
item.OnUpdate += Item_OnUpdate;
editorCanvas.Children.Add(item);
}
}
/// <summary>
/// Handels all necessary steps to start dragging
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void StartDragging(object sender, MouseButtonEventArgs e)
{
MouseHelper.TrapMouseInsideControl(editorBorder);
_selectedComponent = (WorkflowComponentUserControl)sender;
if (e.OriginalSource is Ellipse)
{
var component = _selectedComponent.Component;
_customPath = new CustomPath(component, new Point(component.X + 95, component.Y + ComponentHeight / 2 - ComponentPadding));
editorCanvas.Children.Add(_customPath.Path);
MouseMove += MovePath;
WorkflowComponentUserControls.ForEach(comp => comp.NewSource(_selectedComponent.Component));
}
else
{
_startPoint = e.GetPosition(_selectedComponent);
MouseMove += MoveComponent;
}
}
/// <summary>
/// Finishes the drag and drop action
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void FinishMoving(object sender, MouseButtonEventArgs e)
{
MouseHelper.ClearMouseTrap();
if (_selectedComponent != null)
{
_startPoint = new Point();
MouseMove -= MoveComponent;
_selectedComponent = null;
}
if (_customPath != null)
{
MouseMove -= MovePath;
editorCanvas.Children.Remove(_customPath.Path);
if (CurrentHoveredComponent != null)
{
AddConnection(_customPath.Source, (CurrentHoveredComponent as WorkflowComponentUserControl).Component);
}
_customPath = null;
DrawCanvas(this, null);
}
}