static void OnGroupNameChanged(BindableObject bindable, object oldValue, object newValue)
{
StarBehavior behavior = (StarBehavior)bindable;
string oldGroupName = (string)oldValue;
string newGroupName = (string)newValue;
// Remove existing behavior from Group
if (String.IsNullOrEmpty(oldGroupName))
{
defaultBehaviors.Remove(behavior);
}
else
{
List <StarBehavior> 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 <StarBehavior> behaviors = null;
if (starGroups.ContainsKey(newGroupName))
{
behaviors = starGroups[newGroupName];
}
else
{
behaviors = new List <StarBehavior>();
starGroups.Add(newGroupName, behaviors);
}
behaviors.Add(behavior);
}
}
static void OnIsStarredChanged(BindableObject bindable, object oldValue, object newValue)
{
StarBehavior behavior = (StarBehavior)bindable;
if ((bool)newValue)
{
string groupName = behavior.GroupName;
List <StarBehavior> 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++;
}
}
}
public RankingControl()
{
this.HeightRequest = 44;
var behavior1 = new StarBehavior()
{
GroupName = "WMAStar"
};
var gd1 = new Grid();
var unSelectedImg1 = new Image()
{
Source = "star_outline.png"
};
var selectedImg1 = new Image()
{
Source = "star_selected.png"
};
selectedImg1.SetBinding(Image.IsVisibleProperty, new Binding(source: behavior1, path: "IsStarred"));
gd1.Children.Add(unSelectedImg1, 0, 0);
gd1.Children.Add(selectedImg1, 0, 0);
gd1.Behaviors.Add(behavior1);
var behavior2 = new StarBehavior()
{
GroupName = "WMAStar"
};
var gd2 = new Grid();
var unSelectedImg2 = new Image()
{
Source = "star_outline.png"
};
var selectedImg2 = new Image()
{
Source = "star_selected.png"
};
selectedImg2.SetBinding(Image.IsVisibleProperty, new Binding(source: behavior2, path: "IsStarred"));
gd2.Children.Add(unSelectedImg2, 0, 0);
gd2.Children.Add(selectedImg2, 0, 0);
gd2.Behaviors.Add(behavior2);
var behavior3 = new StarBehavior()
{
GroupName = "WMAStar"
};
var gd3 = new Grid();
var unSelectedImg3 = new Image()
{
Source = "star_outline.png"
};
var selectedImg3 = new Image()
{
Source = "star_selected.png"
};
selectedImg3.SetBinding(Image.IsVisibleProperty, new Binding(source: behavior3, path: "IsStarred"));
gd3.Children.Add(unSelectedImg3, 0, 0);
gd3.Children.Add(selectedImg3, 0, 0);
gd3.Behaviors.Add(behavior3);
var behavior4 = new StarBehavior()
{
GroupName = "WMAStar"
};
var gd4 = new Grid();
var unSelectedImg4 = new Image()
{
Source = "star_outline.png"
};
var selectedImg4 = new Image()
{
Source = "star_selected.png"
};
selectedImg4.SetBinding(Image.IsVisibleProperty, new Binding(source: behavior4, path: "IsStarred"));
gd4.Children.Add(unSelectedImg4, 0, 0);
gd4.Children.Add(selectedImg4, 0, 0);
gd4.Behaviors.Add(behavior4);
behavior5 = new StarBehavior()
{
GroupName = "WMAStar"
};
var gd5 = new Grid();
var unSelectedImg5 = new Image()
{
Source = "star_outline.png"
};
var selectedImg5 = new Image()
{
Source = "star_selected.png"
};
selectedImg5.SetBinding(Image.IsVisibleProperty, new Binding(source: behavior5, path: "IsStarred"));
gd5.Children.Add(unSelectedImg5, 0, 0);
gd5.Children.Add(selectedImg5, 0, 0);
gd5.Behaviors.Add(behavior5);
behavior5.PropertyChanged += RatingchangedEvent;
this.Orientation = StackOrientation.Horizontal;
this.Children.Add(gd1);
this.Children.Add(gd2);
this.Children.Add(gd3);
this.Children.Add(gd4);
this.Children.Add(gd5);
}