private void RepositionLayer(int originalLayerIndex, int newLayerIndex)
{
int layerCount = LiveTopToBottomLayers.Count;
LayerBoxItem layerItem = null;
bool changeEffected = false;
// 1. Remove from old position.
if (originalLayerIndex >= 0 && originalLayerIndex < layerCount)
{
layerItem = LiveTopToBottomLayers[originalLayerIndex];
LiveTopToBottomLayers.RemoveAt(originalLayerIndex);
changeEffected = true;
}
// 2. Add into new position.
layerCount = LiveTopToBottomLayers.Count;
if (newLayerIndex >= 0 && newLayerIndex <= layerCount)
{
if (layerItem == null)
{
if (_LayerObjectCreator != null)
{
layerItem = _LayerObjectCreator.CreateLayer(layerCount);
}
}
if (layerItem != null)
{
LiveTopToBottomLayers.Insert(newLayerIndex, layerItem);
SelectedIndex = newLayerIndex;
changeEffected = true;
}
}
if (changeEffected)
{
// Layers starting from the new position and up (lower indexes in the ListBox) must have their position in the Fontogram updated.
layerCount = LiveTopToBottomLayers.Count;
for (int i = 0; i < layerCount; i++)
{
LiveTopToBottomLayers[i].Position = layerCount - i - 1;
}
LayersChanged?.Invoke();
}
}
protected void OnLayersChanged()
{
LayersChanged?.Invoke();
}
/// <summary>
/// Raise a ValueChanged event on this control
/// </summary>
/// <param name="d"></param>
/// <param name="e"></param>
public void RaiseLayersChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
LayersChanged?.Invoke(d, e);
}