private ITreeItem[] CollectSelectedItems()
{
List <ITreeItem> resultList = new List <ITreeItem>();
CollectSelectedItemsRecursion(this);
return(resultList.ToArray());
void CollectSelectedItemsRecursion(ITreeItem item)
{
//Collect
if (SelectedItemSet.Contains(item))
{
resultList.Add(item);
}
//Recursion
if (item is ITreeFolder)
{
foreach (ITreeItem childItem in ((ITreeFolder)item).ChildItemCollection)
{
CollectSelectedItemsRecursion(childItem);
}
}
}
}
private void ShiftSelectItems(ITreeItem startItem, ITreeItem endItem)
{
//Unselect
SelectedItemSet.UnselectItems();
//Select
SelectedItemSet.AddSelectedItem(startItem);
ITreeItem[] items = CollectItems();
int startIndex = Array.IndexOf(items, startItem);
int endIndex = Array.IndexOf(items, endItem);
if (startIndex > endIndex)
{
int tempValue = endIndex;
endIndex = startIndex;
startIndex = tempValue;
}
for (int i = startIndex; i <= endIndex; ++i)
{
ITreeItem targetItem = items[i];
if (targetItem != startItem)
{
if (SelectedItemSet.Contains(targetItem))
{
SelectedItemSet.RemoveSelectedItem(targetItem);
}
else
{
SelectedItemSet.AddSelectedItem(targetItem);
}
}
}
}
//Events
private void ItemContext_MouseDown(object sender, MouseButtonEventArgs e)
{
if (e.ChangedButton != MouseButton.Left)
{
return;
}
isMousePressed = true;
ITreeItem item = null;
if (e.OriginalSource is FrameworkElement)
{
item = GetPressedItem((FrameworkElement)e.OriginalSource);
}
//Control 혹은 Shift를 누른 상태에선 Pressed에서 이벤트를 종료한다.
if (item != null)
{
if (CanMultiSelect && Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl))
{
//Control select
if (SelectedItemSet.Contains(item))
{
SelectedItemSet.RemoveSelectedItem(item);
}
else
{
SelectedItemSet.AddSelectedItem(item);
}
pressedItem = SelectedItemSet.Count > 0 ? SelectedItemSet.Last : null;
}
else if (CanMultiSelect && pressedItem != null && (Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift)))
{
//Shift select
//pressedItem(Exclusive) ~ Item(Inclusive) 까지 선택한다.
ShiftSelectItems(pressedItem, item);
}
else if (e.ClickCount == 2)
{
//Double click
}
else
{
//Normal select
onMouseCapture = true;
pressedItem = item;
dragStartOffset = (float)e.GetPosition((IInputElement)item).Y;
Mouse.Capture((IInputElement)sender, CaptureMode.Element);
}
}
}
private void ItemContext_MouseMove(object sender, MouseEventArgs e)
{
if (isMousePressed && e.LeftButton != MouseButtonState.Pressed)
{
ItemContext_MouseUp(sender, null);
return;
}
if (!onMouseCapture)
{
return;
}
Point cursorPos = e.GetPosition(ChildItemScrollViewer);
Point absoluteCursorPos = e.GetPosition(ChildItemStackPanel);
if (!onDragging)
{
float distance = Mathf.Abs(dragStartOffset - (float)e.GetPosition((IInputElement)pressedItem).Y);
if (distance < 10)
{
return;
}
else
{
//Select item
if (SelectedItemSet.Contains(pressedItem))
{
SelectedItemSet.RemoveSelectedItem(pressedItem);
SelectedItemSet.AddSelectedItem(pressedItem);
}
else
{
SelectedItemSet.SetSelectedItem(pressedItem);
}
//Start drag
SetDraggingState(true);
SetDraggingCursorVisible(true);
CreateDraggingClone((FrameworkElement)pressedItem);
}
}
//Dragging
GetNodeTarget((float)cursorPos.Y);
//Move draggingClone
draggingClone.Margin = new Thickness(0d, cursorPos.Y - dragStartOffset, 0d, 0d);
draggingClone.Opacity = 0.3d;
}