/// <summary>
/// Paste questions in certain position
/// </summary>
/// <param name="position">Position to paste questions</param>
private void OnPasteQuestions(Point position)
{
this.ClearSelection();
// for the case when mouse position was out of UI change start position
if (position.X < 0 || position.Y < 0)
{
position.X = position.Y = 30;
}
// calculate delta between topmost item and paste position
BaseQuestionViewModel topmostItem = this.copiedQuestionsBuffer.OrderByDescending(x => x.Top).Last();
double deltaTop = topmostItem.Top - position.Y;
double deltaLeft = topmostItem.Left - position.X;
// buffer for undo/redo
BaseQuestionViewModel[] copiedElements = new BaseQuestionViewModel[this.copiedQuestionsBuffer.Count];
for (int i = 0; i < this.copiedQuestionsBuffer.Count; i++)
{
// create new copy and update name and position
BaseQuestionViewModel copy = this.copiedQuestionsBuffer[i].CreateCopy();
copy.Name = NamingManager.GetNextAvailableElementName(this.PageQuestions);
copy.Top -= deltaTop;
copy.Left -= deltaLeft;
this.OnAddQuestion(copy);
copy.IsSelected = true;
copiedElements[i] = copy;
}
ActionTracker.TrackAction(new AddElementsAction(copiedElements, this.PageQuestions));
}
/// <summary>
/// Removes selected elements
/// </summary>
private void OnRemoveElement()
{
BaseQuestionViewModel[] removedElements = new BaseQuestionViewModel[this.SelectedElements.Count];
int index = 0;
foreach (BaseQuestionViewModel selectedItem in this.SelectedElements)
{
this.PageQuestions.Remove(selectedItem);
removedElements[index++] = selectedItem;
}
this.SelectedElements.Clear();
ActionTracker.TrackAction(new RemoveElementsAction(removedElements, this.PageQuestions));
this.OnPropertyChanged(nameof(this.PropertiesContext));
}
/// <summary>
/// Add new element via selection rectangle
/// </summary>
/// <param name="area">Element area</param>
public void AddQuestion(Rect area)
{
string nextName = NamingManager.GetNextAvailableElementName(this.PageQuestions);
BaseQuestionViewModel newQuestion;
if (this.IsAddingChoiceBox)
{
newQuestion = new ChoiceBoxViewModel(nextName, area);
this.IsAddingChoiceBox = false;
}
else
{
newQuestion = new GridViewModel(nextName, area);
this.IsAddingGrid = false;
}
this.OnAddQuestion(newQuestion);
newQuestion.IsSelected = true;
ActionTracker.TrackAction(new AddElementsAction(new[] { newQuestion }, this.PageQuestions));
}