static void OnGroupNameChanged(BindableObject bindable, object oldValue, object newValue)
{
RatingBehavior behavior = (RatingBehavior)bindable;
string oldGroupName = (string)oldValue;
string newGroupName = (string)newValue;
// Remove existing behavior from Group
if (String.IsNullOrEmpty(oldGroupName))
{
defaultBehaviors.Remove(behavior);
}
else
{
List <RatingBehavior> behaviors = starGroups[oldGroupName];
behaviors.Remove(behavior);
if (behaviors.Count == 0)
{
starGroups.Remove(oldGroupName);
}
}
// Add New Behavior to the group
if (String.IsNullOrEmpty(newGroupName))
{
defaultBehaviors.Add(behavior);
}
else
{
List <RatingBehavior> behaviors = null;
if (starGroups.ContainsKey(newGroupName))
{
behaviors = starGroups[newGroupName];
}
else
{
behaviors = new List <RatingBehavior>();
starGroups.Add(newGroupName, behaviors);
}
behaviors.Add(behavior);
}
}
static void OnIsStarredChanged(BindableObject bindable, object oldValue, object newValue)
{
RatingBehavior behavior = (RatingBehavior)bindable;
if ((bool)newValue)
{
string groupName = behavior.GroupName;
List <RatingBehavior> behaviors = null;
if (string.IsNullOrEmpty(groupName))
{
behaviors = defaultBehaviors;
}
else
{
behaviors = starGroups[groupName];
}
bool itemReached = false;
int count = 1, position = 0;
// all positions to left IsStarred = true and all position to the right is false
foreach (var item in behaviors)
{
if (item != behavior && !itemReached)
{
item.IsStarred = true;
}
if (item == behavior)
{
itemReached = true;
item.IsStarred = true;
position = count;
}
if (item != behavior && itemReached)
{
item.IsStarred = false;
}
item.Rating = position;
count++;
}
}
}