private static void Resize(ICanvasItem canvasItem, SizeChangeEventArgs sizeChange, double currentParentLeft)
{
var currentLeft = canvasItem.Left - currentParentLeft;
var currentWidth = canvasItem.Width;
var leftProportion = currentLeft / sizeChange.OldValue;
var widthProportion = currentWidth / sizeChange.OldValue;
canvasItem.Left = currentParentLeft + sizeChange.NewValue * leftProportion;
canvasItem.Width = sizeChange.NewValue * widthProportion;
}
private void SetWidth(SizeChangeEventArgs sizeChangeEventArgs, double currentParentLeft)
{
foreach (var canvasItem in Children)
{
Resize(canvasItem, sizeChangeEventArgs, currentParentLeft);
}
}
private void OnHeightChanged(object sender, SizeChangeEventArgs sizeChangeEventArgs)
{
Children.SwapCoordinates();
SetWidth(sizeChangeEventArgs, Top);
Children.SwapCoordinates();
}
private void OnWidthChanged(object sender, SizeChangeEventArgs sizeChangeEventArgs)
{
SetWidth(sizeChangeEventArgs, Left);
}
protected virtual void OnWidthChanged(SizeChangeEventArgs e)
{
var handler = WidthChanged;
if (handler != null) handler(this, e);
}