public AssessmentViewModel(int numOfStudents, int studentsPerPage, List <Chapter> chapters, PageService _pageService)
{
this.studentsPerPage = studentsPerPage;
this.numOfStudents = numOfStudents;
this._pageService = _pageService;
_students = new ObservableCollection <Student>();
for (int x = 1; x <= numOfStudents; x++)
{
_students.Add(new Student {
Name = "student " + x
});
}
Students = new ObservableCollection <StudentAndList>();
for (int s = 0; s < _students.Count; s++)
{
Students.Add(new StudentAndList(_students[s], chapters[s]));
}
int i = 0;
while (i < _students.Count)
{
ObservableCollection <StudentAndList> temp = new ObservableCollection <StudentAndList>(Students.ToList().GetRange(i, Math.Min(studentsPerPage, Students.Count - i)));
StudentListGroup sg = new StudentListGroup(temp);
StudentGroups.Add(sg);
i += studentsPerPage;
}
MistakeItemPressedCommand = new Command <ToolbarItem>((e) => MistakeItemPressedMethod(e));
MessagingCenter.Subscribe <AssessmentPage, Tuple <StudentAndList, Word, string> >(this, "MostRecentView", (sender, arg) =>
{
_selectedStudentAndList = arg.Item1;
_selectedWord = arg.Item2;
_partOfWord = arg.Item3;
TheWord = _partOfWord;
});
}
void OnTouchEffectAction(object sender, TouchActionEventArgs args)
{
SKCanvasView canvasView = (SKCanvasView)((Grid)sender).Children[0];
if (!dictOfPaths.ContainsKey(canvasView.Id))
{
Dictionary <long, SKPath> inProgressPaths = new Dictionary <long, SKPath>();
List <SKPath> completedPaths = new List <SKPath>();
dictOfPaths.Add(canvasView.Id, new Tuple <Dictionary <long, SKPath>, List <SKPath> >(inProgressPaths, completedPaths));
}
switch (args.Type)
{
case TouchActionType.Pressed:
if (!dictOfPaths[canvasView.Id].Item1.ContainsKey(args.Id))
{
SKPath path = new SKPath();
path.MoveTo(ConvertToPixel(canvasView, args.Location));
dictOfPaths[canvasView.Id].Item1.Add(args.Id, path);
canvasView.InvalidateSurface();
}
break;
case TouchActionType.Moved:
if (dictOfPaths[canvasView.Id].Item1.ContainsKey(args.Id))
{
SKPath path = dictOfPaths[canvasView.Id].Item1[args.Id];
path.LineTo(ConvertToPixel(canvasView, args.Location));
canvasView.InvalidateSurface();
}
break;
case TouchActionType.Released:
if (MistakeRegistred == false)
{
undoLastDrawing();
}
MistakeRegistred = false;
if (dictOfPaths[canvasView.Id].Item1.ContainsKey(args.Id))
{
dictOfPaths[canvasView.Id].Item2.Add(dictOfPaths[canvasView.Id].Item1[args.Id]);
pushIntoMemory(canvasView);
SKPoint[] pathpoints = dictOfPaths[canvasView.Id].Item1[args.Id].Points;
float minx = (float)Int32.MaxValue;
float maxx = 0;
foreach (SKPoint point in pathpoints)
{
minx = Math.Min(minx, point.X);
maxx = Math.Max(maxx, point.X);
}
StackLayout sl = (StackLayout)((Grid)sender).Children[1];
double space = sl.Spacing;
double pos = 0;
int firstChar = 0;
int lastChar = sl.Children.Count - 1;
bool firstCharSet = false;
for (int i = 0; i < sl.Children.Count; i++)
{
if (i == 0)
{
pos += ((Label)(sl.Children[i])).Width + space / 2;
}
else
{
pos += ((Label)(sl.Children[i])).Width + space;
}
if ((!firstCharSet) && (minx <= pos))
{
firstChar = i;
firstCharSet = true;
}
if ((firstCharSet) && (maxx <= pos))
{
lastChar = i;
break;
}
}
Word word = (Word)((Grid)sender).BindingContext;
StudentAndList studentAndList = (StudentAndList)(canvasView.BindingContext);
MessagingCenter.Send <AssessmentPage, Tuple <StudentAndList, Word, string> >(this, "MostRecentView", new Tuple <StudentAndList, Word, string>(studentAndList, word, word.WordText.Substring(firstChar, lastChar - firstChar + 1)));
dictOfPaths[canvasView.Id].Item1.Remove(args.Id);
canvasView.InvalidateSurface();
}
break;
case TouchActionType.Cancelled:
if (MistakeRegistred == false)
{
undoLastDrawing();
}
MistakeRegistred = false;
if (dictOfPaths[canvasView.Id].Item1.ContainsKey(args.Id))
{
dictOfPaths[canvasView.Id].Item1.Remove(args.Id);
canvasView.InvalidateSurface();
}
break;
}
}
