public UndoManager(Layers layerList)
{
layers = layerList;
ClearHistory();
}
public override void Redo(Layers list)
{
// Clear list - make DeleteAll again
list[list.ActiveLayerIndex].Graphics.Clear();
}
public override void Redo(Layers list)
{
// Replace all objects in the list with objects from listAfter
ReplaceObjects(list[activeLayer].Graphics, listAfter);
}
public override void Undo(Layers list)
{
// Replace all objects in the list with objects from listBefore
ReplaceObjects(list[activeLayer].Graphics, listBefore);
}
// Call this function AFTER operation.
public void NewState(Layers layerList)
{
// Keep objects state after operation.
FillList(layerList[activeLayer].Graphics, ref listAfter);
}
// Create this command BEFORE operation.
public CommandChangeState(Layers layerList)
{
// Keep objects state before operation.
activeLayer = layerList.ActiveLayerIndex;
FillList(layerList[activeLayer].Graphics, ref listBefore);
}
/// <summary>
/// Undo last Add command
/// </summary>
/// <param name="list">Layers collection</param>
public override void Undo(Layers list)
{
list[list.ActiveLayerIndex].Graphics.DeleteLastAddedObject();
}