public void FigureSelected(FigureSelectedEventArgs arg)
{
var sourceRect = new RelativeSelection(
_page.PageDimensions,
arg.RelativeOffsetX,
arg.RelativeOffsetY,
arg.RelativeWidth,
arg.RelativeHeight);
var figure = _page.CreateFigure(sourceRect);
_figureMap.Add(arg.Id, figure);
var figureSelectedEvent = new FigureSelectedEvent(
figure,
() => {
_page.RemoveFigure(_figureMap[arg.Id]);
_figureMap.Remove(arg.Id);
arg.Undo();
});
_messageBus.Publish(figureSelectedEvent);
}
protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonUp(e);
if (IsMouseCaptured && _currentSelectionEventArgs != null)
{
ReleaseMouseCapture();
RaiseEvent(_currentSelectionEventArgs);
_currentSelection = null;
_currentSelectionEventArgs = null;
}
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (IsMouseCaptured)
{
if (_currentSelection == null)
{
var newSelection = new Selection(NextSelectionId++);
Children.Add(newSelection);
_currentSelectionEventArgs = new FigureSelectedEventArgs(
FigureSelectedEvent,
this,
newSelection.Id,
() => Children.Remove(newSelection));
_currentSelection = newSelection;
}
Point currentPoint = e.GetPosition(this);
Point modifiedPoint = RestrictToCanvasBounds(currentPoint);
double width = Math.Abs(_mouseLeftDownPoint.X - modifiedPoint.X);
double height = Math.Abs(_mouseLeftDownPoint.Y - modifiedPoint.Y);
double left = Math.Min(_mouseLeftDownPoint.X, modifiedPoint.X);
double top = Math.Min(_mouseLeftDownPoint.Y, modifiedPoint.Y);
_currentSelection.Width = width;
_currentSelection.Height = height;
SetLeft(_currentSelection, left);
SetTop(_currentSelection, top);
_currentSelectionEventArgs.RelativeOffsetY = top / ActualHeight;
_currentSelectionEventArgs.RelativeOffsetX = left / ActualWidth;
_currentSelectionEventArgs.RelativeWidth = width / ActualWidth;
_currentSelectionEventArgs.RelativeHeight = height / ActualHeight;
}
}