private void TreeContainer_MouseMove(object sender, MouseEventArgs e)
{
if (!leftMouseDragged)
{
return;
}
var position = e.GetPosition(this);
var transform = TreeCanvas.RenderTransform as MatrixTransform;
var matrix = transform.Matrix;
matrix.Translate(position.X - lastMousePos.X, position.Y - lastMousePos.Y);
transform.Matrix = matrix;
lastMousePos = position;
TreeCanvas.UpdateLayout();
}
private void TreeContainer_MouseWheel(object sender, MouseWheelEventArgs e)
{
var position = e.GetPosition(TreeCanvas);
var transform = TreeCanvas.RenderTransform as MatrixTransform;
var matrix = transform.Matrix;
var scale = e.Delta >= 0 ? scaleFactor : (1.0 / scaleFactor);
var newScaleFactor = matrix.M11 * scale;
if (!(newScaleFactor < MaxScale && newScaleFactor > MinScale))
{
return;
}
matrix.ScaleAtPrepend(scale, scale, position.X, position.Y);
transform.Matrix = matrix;
TreeCanvas.UpdateLayout();
}
