public static void AddOrSelectTool <T>(this IPerspective me, Func <T> factory) where T : IToolViewModel
{
var currentTool = me.Tools.FirstOrDefault(t => t is T);
if (currentTool != default)
{
me.SelectedTool = currentTool;
}
else
{
me.AddTool(factory());
}
}
public static void AddOrSelectTool <T>(this IPerspective me, T tool) where T : IToolViewModel
{
var currentTool = me.Tools.FirstOrDefault(t => t.Equals(tool));
if (currentTool != null)
{
me.SelectedTool = currentTool;
}
else
{
me.AddTool(tool);
}
}