public static StepMode GetInstance()
{
if (stepMode is null)
{
stepMode = new StepMode();
}
return(stepMode);
}
/*******************************************************************************************/
/*******************************************************************************************/
public Result BalanceTreePrepareSteps()
{
if (tree is null)
{
return(Result.NO_TREE);
}
StepMode.GetInstance().PrepareStepsForTreeBalancing(tree);
return(Result.OK);
}
/*******************************************************************************************/
/*******************************************************************************************/
public Result AddNodesPrepareSteps(String text)
{
var keys = CheckRequirementsToCreateTree(text, out Result result);
if (keys is null)
{
return(result);
}
StepMode.GetInstance().PrepareStepsForAddNodes(tree, keys);
return(Result.OK);
}
/*******************************************************************************************/
/*******************************************************************************************/
public Result DeleteNodesPrepareSteps()
{
var selectedNodes = CheckRequirementsToDeleteNodes(out Result result);
if (selectedNodes is null)
{
return(result);
}
StepMode.GetInstance().PrepareStepsForDeleteNodes(tree, selectedNodes);
return(Result.OK);
}
/*******************************************************************************************/
/*******************************************************************************************/
public Result DrawTreePrepareSteps(String text)
{
var keys = new Parser().GetNodesValues(text, out Result result);
if (keys is null)
{
return(result);
}
DestroyTree();
tree = GetTree();
StepMode.GetInstance().PrepareStepsForAddNodes(tree, keys);
return(Result.OK);
}
public void StepBackward()
{
Step(StepMode.GetInstance().StepBackward);
}
/*******************************************************************************************/
/*******************************************************************************************/
private void ActionStepModeLeave(object sender, RoutedEventArgs e)
{
StepMode.Destroy();
PrepareMenuIcons(Settings.TreeType, false);
}