/// <summary>
/// Initializes a new instance of the <see cref="PrioritizedTrigger"/> structure.
/// </summary>
/// <param name="trigger">The trigger being applied.</param>
/// <param name="selector">The selector which caused the trigger to be applied.</param>
/// <param name="priority">The trigger's priority.</param>
/// <param name="index">The index of the trigger's rule set within its style sheet.</param>
public PrioritizedTrigger(UvssTrigger trigger, UvssSelector selector, Int32 priority, Int32 index)
{
this.Trigger = trigger;
this.Selector = selector;
this.Priority = priority;
this.Index = index;
}
/// <summary>
/// Adds a trigger to the prioritizer.
/// </summary>
/// <param name="uv">The Ultraviolet context.</param>
/// <param name="selector">The selector which caused this style to be considered.</param>
/// <param name="navigationExpression">The navigation expression associated with the style.</param>
/// <param name="trigger">The trigger to add to the prioritizer.</param>
/// <param name="index">The index of the trigger's rule set within the style sheet.</param>
public void Add(UltravioletContext uv, UvssSelector selector, NavigationExpression?navigationExpression, UvssTrigger trigger, Int32 index)
{
Contract.Require(uv, nameof(uv));
var key = new StyleKey(trigger.CanonicalName, navigationExpression);
var priority = CalculatePriorityFromSelector(selector, false);
PrioritizedTrigger existing;
if (!triggers.TryGetValue(key, out existing))
{
triggers[key] = new PrioritizedTrigger(trigger, selector, priority, index);
}
else
{
var comparison = selector.ComparePriority(existing.Selector);
if (comparison == 0 && index > existing.Index)
{
comparison = 1;
}
if (comparison > 0 && (trigger.IsImportant || !existing.Trigger.IsImportant))
{
triggers[key] = new PrioritizedTrigger(trigger, selector, priority, index);
}
}
}
/// <summary>
/// Removes an item from the collection.
/// </summary>
/// <param name="trigger">The trigger to remove from the collection.</param>
/// <returns><see langword="true"/> if the item was removed from the collection; otherwise, <see langword="false"/>.</returns>
internal Boolean Remove(UvssTrigger trigger)
{
return(triggers.Remove(trigger));
}
/// <summary>
/// Gets a value indicating whether the collection contains the specified item.
/// </summary>
/// <param name="trigger">The trigger to evaluate.</param>
/// <returns><see langword="true"/> if the collection contains the specified item; otherwise, <see langword="false"/>.</returns>
internal Boolean Contains(UvssTrigger trigger)
{
return(triggers.Contains(trigger));
}
/// <summary>
/// Adds an item to the collection.
/// </summary>
/// <param name="trigger">The trigger to add to the collection.</param>
internal void Add(UvssTrigger trigger)
{
triggers.Add(trigger);
}
