void DragThumb_DragDelta(object sender, DragDeltaEventArgs e)
{
DesignerItemViewModelBase designerItem = this.DataContext as DesignerItemViewModelBase;
if (designerItem != null && designerItem.IsSelected)
{
double minLeft = double.MaxValue;
double minTop = double.MaxValue;
// we only move DesignerItems
var designerItems = designerItem.SelectedItems;
foreach (DesignerItemViewModelBase item in designerItems.OfType <DesignerItemViewModelBase>())
{
double left = item.Left;
double top = item.Top;
minLeft = double.IsNaN(left) ? 0 : Math.Min(left, minLeft);
minTop = double.IsNaN(top) ? 0 : Math.Min(top, minTop);
double deltaHorizontal = Math.Max(-minLeft, e.HorizontalChange);
double deltaVertical = Math.Max(-minTop, e.VerticalChange);
item.Left += deltaHorizontal;
item.Top += deltaVertical;
}
e.Handled = true;
}
}
static void Fe_MouseEnter(object sender, MouseEventArgs e)
{
if (((FrameworkElement)sender).DataContext is DesignerItemViewModelBase)
{
DesignerItemViewModelBase designerItem = (DesignerItemViewModelBase)((FrameworkElement)sender).DataContext;
designerItem.ShowConnectors = true;
}
}
protected override void OnDrop(DragEventArgs e)
{
base.OnDrop(e);
DragObject dragObject = e.Data.GetData(typeof(DragObject)) as DragObject;
if (dragObject != null)
{
(DataContext as IDiagramViewModel).ClearSelectedItemsCommand.Execute(null);
Point position = e.GetPosition(this);
DesignerItemViewModelBase itemBase = (DesignerItemViewModelBase)Activator.CreateInstance(dragObject.ContentType);
itemBase.Left = Math.Max(0, position.X - DesignerItemViewModelBase.ItemWidth / 2);
itemBase.Top = Math.Max(0, position.Y - DesignerItemViewModelBase.ItemHeight / 2);
itemBase.IsSelected = true;
labelIndex++;
itemBase.Label = "步骤" + labelIndex;
(DataContext as IDiagramViewModel).AddItemCommand.Execute(itemBase);
}
e.Handled = true;
}
public FullyCreatedConnectorInfo(DesignerItemViewModelBase dataItem, ConnectorOrientation orientation)
: base(orientation)
{
this.DataItem = dataItem;
}