public DesignerTabVM(DesignerVM parent)
{
ParentForm = parent;
AddItemCommand = new MyCommand(ExecuteAddItemCommand);
RemoveItemCommand = new MyCommand(ExecuteRemoveItemCommand);
RemoveSelectedItemsCommand = new MyCommand(ExecuteRemoveSelectedItemsCommand);
ClearSelectedItemsCommand = new MyCommand(ExecuteClearSelectedItemsCommand);
ExportItemsCommand = new MyCommand(ExecuteExportItemsCommand);
Mediator.Instance.Register(this);
}
protected override void OnDrop(DragEventArgs e)
{
base.OnDrop(e);
DragObject dragObject = e.Data.GetData(typeof(DragObject)) as DragObject;
if (dragObject != null)
{
DesignerVM dc = (DataContext as DesignerVM);
dc.ActiveTab.ClearSelection();
Point position = e.GetPosition(this);
DesignerItemBaseVM item = (DesignerItemBaseVM)Activator.CreateInstance(dragObject.ContentType);
item.Left = Math.Max(0, position.X - item.Width / 2); // want drop point to be upper left corner, not center of item
item.Top = Math.Max(0, position.Y - item.Height / 2);
item.IsSelected = true;
dc.ActiveTab.AddItemCommand.Execute(item);
dc.ActiveTab.SelectedItem = item;
// Give the DesignerCanvas focus so it can receive arrow key presses
this.Focus();
}
e.Handled = true;
}
private void UpdateSelection()
{
DesignerVM vm = (designerCanvas.DataContext as DesignerVM);
Rect rubberBand = new Rect(startPoint.Value, endPoint.Value);
ItemsControl itemsControl = TreeHelper.TryFindParent <ItemsControl>(designerCanvas);
int i = 0;
foreach (DesignerItemBaseVM item in vm.ActiveTab.Items)
{
if (item is DesignerItemBaseVM)
{
DependencyObject container = itemsControl.ItemContainerGenerator.ContainerFromItem(item);
Rect itemRect = VisualTreeHelper.GetDescendantBounds((Visual)container);
Rect itemBounds = ((Visual)container).TransformToAncestor(designerCanvas).TransformBounds(itemRect);
if (rubberBand.Contains(itemBounds))
{
item.IsSelected = true;
// IMPROVE: following always selects first item as ordered in the list, rather than the first
// item encountered by the rubber band selector
if (i == 0)
{
vm.ActiveTab.SelectedItem = item;
}
i++;
}
else
{
if (!(Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl)))
{
item.IsSelected = false;
}
}
}
}
}
protected override void OnMouseDown(MouseButtonEventArgs e)
{
base.OnMouseDown(e);
if (e.LeftButton == MouseButtonState.Pressed)
{
// if the canvas ("this") is the source of the event, assume rubberband selecting
if (e.Source == this)
{
// cache the start point
rubberbandSelectionStartPoint = e.GetPosition(this);
// unless holding down control, clear the selection
DesignerVM dc = (DataContext as DesignerVM);
if (!(Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl)))
{
dc.ActiveTab.ClearSelection();
}
e.Handled = true;
}
}
}
