internal void DoPreviewMouseUp(object sender, MouseButtonEventArgs e)
{
double left = Canvas.GetLeft(activeRect); //left and right track the location of the marked region, ...
double right = left + activeRect.Width; // this is increased in size as needed to account for overlaps with exisiting regions
bool c;
MarkerRectangle current = null; //this references the current region fow which we are looking for overlaps
//The initial null value indicates that we're looking at the just-marked region, for which there is no MarkerRectangle yet.
//If we find an overlap, we adjust the existing region and forget about the one we just marked.
//However, we need to loop back through and ascertain that the newly increased region doesn't overlap some other one!
do
{
c = false; //tracks if there is an overlap found
foreach (MarkerRectangle mr in markedRegions)
{
if (mr == current) continue;
if (mr.Contains(left) || mr.Contains(right) || mr.IsWithin(left, right)) //then we have an overlap
{
c = true;
left = Math.Min(left, mr.leftEdge);
right = Math.Max(right, mr.rightEdge);
if (current != null) //remove old region
Remove(current);
else //we can get rid of the marker rectangle, which is about to be subsumed into another region
{
this.Children.Remove(activeRect);
activeRect = null;
}
current = mr; //update current region
break;
}
}
} while (c == true); //keep going until there are no more overlaps
if (current == null) //then this is a distinct, new region -- no overlaps found
{ //Make a new region/marker
current = new MarkerRectangle();
activeRect.Fill = Brushes.Blue;
current.rect = activeRect;
markedRegions.Add(current);
}
else
{ //Othwise update overlapped region
Canvas.SetLeft(current.rect, left);
}
current.rect.Width = right - left;
current.leftEdge = left;
current.rightEdge = right;
}
internal void Remove(MarkerRectangle mr)
{
markedRegions.Remove(mr);
this.Children.Remove(mr.rect);
mr.rect = null;
}
//create new marker rectangle from scratch
public void createMarkRegion(double left, double right)
{
activeRect = new Rectangle();
activeRect.Opacity = 0.4;
activeRect.Fill = Brushes.Blue;
activeRect.Width = right - left;
Binding b = new Binding("ActualHeight"); //create finding to panel height
b.Source = this.Parent;
activeRect.SetBinding(Rectangle.HeightProperty, b); //to control rectangle height
Canvas.SetTop(activeRect, 0);
Canvas.SetLeft(activeRect, left);
Children.Add(activeRect); //add it to canvas
MarkerRectangle current = new MarkerRectangle(); //now log it into marked regions
current.rect = activeRect;
current.leftEdge = left;
current.rightEdge = right;
markedRegions.Add(current);
}
