/// <summary>
/// ドラッグを開始
/// </summary>
/// <param name="controller">ドラッグコントローラ</param>
/// <param name="start"></param>
/// <param name="first">1回目のドラッグ位置</param>
/// <param name="others">2回目以降のドラッグ位置</param>
private DragControllerEventArgs DoDrag(IDragController controller, Point start, Point first, params Point[] others)
{
// start drag
var startArgs = new DragControllerEventArgs(start, start, new Vector(0, 0), MouseButton.Left);
{
Assert.True(controller.CanDragStart(startArgs));
controller.OnStartDrag(startArgs);
}
// drag moving
var firstDragArgs = startArgs.CreateUpdatedArgs(first);
{
controller.OnDragMoving(firstDragArgs);
}
var args = firstDragArgs;
// other dragging
{
foreach (var other in others)
{
args = args.CreateUpdatedArgs(other);
controller.OnDragMoving(args);
}
}
return(args);
}
private bool try_cancel()
{
if (_currentController != null)
{
_currentController.Cancel();
_currentController = null;
return(true);
}
return(false);
}
private void on_mouse_down(object sender, MouseEventArgs args)
{
if (check_parent_event_doing())
{
return;
}
try_cancel();
_startPoint = args.GetPosition(_target);
_prevPoint = _startPoint;
var convertedArgs = convert_args(args);
PreviewDragStart?.Invoke(this, convertedArgs);
_currentController = _converter(convertedArgs);
if (_currentController == null)
{
return;
}
if (_currentController.CanDragStart(convertedArgs) is false)
{
try_cancel();
return;
}
if (_onClickFocus)
{
_target.Focus();
}
_currentController.OnStartDrag(convertedArgs);
args.Handled = true;
}
