/// <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>
/// Creates copy of current question
/// </summary>
/// <returns>Question copy</returns>
public override BaseQuestionViewModel CreateCopy()
{
GridViewModel elementCopy = new GridViewModel(this.Name, this.Top, this.Left, this.Width, this.Height, this.ParentTemplate, this.Orientation);
elementCopy.SelectedMapping = this.SelectedMapping;
foreach (ChoiceBoxViewModel choiceBox in this.ChoiceBoxes)
{
BaseQuestionViewModel choiceBoxCopy = choiceBox.CreateCopy();
elementCopy.ChoiceBoxes.Add((ChoiceBoxViewModel)choiceBoxCopy);
}
return(elementCopy);
}
/// <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>
/// Handles questions selection logic
/// </summary>
/// <param name="sender">Question with changed property</param>
/// <param name="e">The event args</param>
private void ElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == "IsSelected")
{
BaseQuestionViewModel element = (BaseQuestionViewModel)sender;
if (element.IsSelected)
{
this.SelectedElements.Add(element);
}
else
{
this.SelectedElements.Remove(element);
}
this.OnPropertyChanged(nameof(this.PropertiesContext));
}
}
/// <summary>
/// Apply selected question's style to all other questions
/// </summary>
private void OnApplyFormatting()
{
BaseQuestionViewModel ethalon = this.SelectedElements[0];
if (ethalon is ChoiceBoxViewModel)
{
foreach (var element in this.PageQuestions.Where(x => x is ChoiceBoxViewModel && x != ethalon))
{
((ChoiceBoxViewModel)element).ApplyStyle((ChoiceBoxViewModel)ethalon);
}
}
else if (ethalon is GridViewModel)
{
foreach (var element in this.PageQuestions.Where(x => x is GridViewModel && x != ethalon))
{
((GridViewModel)element).ApplyStyle((GridViewModel)ethalon);
}
}
}
/// <summary>
/// Add element to page elements collection
/// </summary>
/// <param name="question">Element to add</param>
private void OnAddQuestion(BaseQuestionViewModel question)
{
// subscribe to property changed to track selection changes
question.PropertyChanged += this.ElementPropertyChanged;
this.PageQuestions.Add(question);
}
