private void DragAreaTracker_MouseMove(object sender, MouseEventArgs e)
{
if (null != current_annotation)
{
Point mouse_move_point = e.GetPosition(canvas);
Canvas.SetLeft(current_annotation, Math.Min(mouse_move_point.X, mouse_down_point.X));
Canvas.SetTop(current_annotation, Math.Min(mouse_move_point.Y, mouse_down_point.Y));
current_annotation.Width = Math.Abs(mouse_move_point.X - mouse_down_point.X);
current_annotation.Height = Math.Abs(mouse_move_point.Y - mouse_down_point.Y);
OnDragInProgress?.Invoke(button_left_pressed, button_right_pressed, mouse_down_point, mouse_move_point);
}
}
private void DragAreaTracker_MouseDown(object sender, MouseButtonEventArgs e)
{
mouse_down_point = e.GetPosition(canvas);
button_left_pressed = e.LeftButton == MouseButtonState.Pressed;
button_right_pressed = e.RightButton == MouseButtonState.Pressed;
if (null == current_annotation)
{
canvas.CaptureMouse();
current_annotation = new DragAreaControl(visible);
Canvas.SetLeft(current_annotation, mouse_down_point.X);
Canvas.SetTop(current_annotation, mouse_down_point.Y);
current_annotation.Width = 0;
current_annotation.Height = 0;
canvas.Children.Add(current_annotation);
OnDragStarted?.Invoke(button_left_pressed, button_right_pressed, mouse_down_point);
OnDragInProgress?.Invoke(button_left_pressed, button_right_pressed, mouse_down_point, mouse_down_point);
}
}