Resolving Symbolic References in a CodeDOM (Part 7)

// The Nova Project by Ken Beckett.
// Copyright (C) 2007-2012 Inevitable Software, all rights reserved.
// Released under the Common Development and Distribution License, CDDL-1.0: http://opensource.org/licenses/cddl1.php

using System.Collections.Generic;
using System.Windows.Media;

using Nova.CodeDOM;
using Nova.Resolving;

namespace Nova.UI
{
    /// <summary>
    /// The view model for a <see cref="CodeDOM.UnresolvedRef"/>.
    /// </summary>
    public class UnresolvedRefVM : TypeRefBaseVM
    {
        #region /* STATICS */

        internal static void AddViewModelMapping()
        {
            CreateViewModel.Add(typeof(UnresolvedRef),
                delegate(CodeObject codeObject, bool isDescription, Dictionary<CodeObject, CodeObjectVM> dictionary) { return new UnresolvedRefVM((UnresolvedRef)codeObject, dictionary); });
        }

        #endregion

        #region /* CONSTRUCTORS */

        /// <summary>
        /// Create a view model instance for the specified <see cref="CodeDOM.UnresolvedRef"/>.
        /// </summary>
        public UnresolvedRefVM(UnresolvedRef unresolvedRef, Dictionary<CodeObject, CodeObjectVM> dictionary)
            : base(unresolvedRef, true, dictionary)
        { }

        #endregion

        #region /* PROPERTIES */

        /// <summary>
        /// The underlying <see cref="CodeDOM.UnresolvedRef"/> model.
        /// </summary>
        public UnresolvedRef UnresolvedRef
        {
            get { return (UnresolvedRef)CodeObject; }
        }

        #endregion

        #region /* METHODS */

        #endregion

        #region /* RENDERING */

        /// <summary>
        /// Get the brush used to render the UnresolvedRef.
        /// </summary>
        protected override Brush RenderBrush(RenderFlags flags)
        {
            // This can be overloaded with NORMAL_BRUSH for DynamicExpressionRefs.
            return (flags.HasFlag(RenderFlags.InDocComment) ? WARNING_BRUSH : ERROR_BRUSH);
        }

        public override void RenderExpression(CodeRenderer renderer, RenderFlags flags)
        {
            renderer.RenderText((string)UnresolvedRef.Reference, GetMessageBrush(RenderBrush(flags), flags), this);
            RenderTypeArguments(renderer, _typeArgumentVMs, flags, this);
            RenderArrayRanks(renderer, flags);
        }

        public override void RenderToolTip(CodeRenderer renderer, RenderFlags flags)
        {
            RenderType(renderer, CodeObject.GetType(), flags, this);

            TypeRefBase typeRef = UnresolvedRef.EvaluateType();
            if (typeRef != null && typeRef != UnresolvedRef)
            {
                // If an unambiguous common type could be inferred from all of the possible matches, display it
                RenderEvaluatedType(renderer, typeRef, flags | RenderFlags.Description);
            }
            else
            {
                typeRef = UnresolvedRef.EvaluateToMinimumType();
                if (typeRef != UnresolvedRef)
                {
                    // If a minimum common type could be inferred, display it
                    renderer.RenderText("   { minimum type: ", NORMAL_BRUSH, TextStyle.Proportional);
                    CreateVM(typeRef).Render(renderer, flags);
                    renderer.RenderText(" }", NORMAL_BRUSH, TextStyle.Proportional);
                }
            }
            renderer.NewLine();

            renderer.RenderText("Category: ", NORMAL_BRUSH, TextStyle.Proportional | TextStyle.Bold);
            renderer.RenderText(UnresolvedRef.ResolveCategory.ToString(), NORMAL_BRUSH, TextStyle.Proportional);
            RenderMessagesInToolTip(renderer, flags);
            if (UnresolvedRef.Matches != null && UnresolvedRef.Matches.Count > 0)
            {
                renderer.NewLine();
                renderer.RenderText("Match Candidates:", NORMAL_BRUSH, TextStyle.Proportional | TextStyle.Bold);
                renderer.CreateBlock(3);
                foreach (MatchCandidate matchCandidate in UnresolvedRef.Matches)
                {
                    MatchCandidateVM matchCandidateVM = new MatchCandidateVM(matchCandidate, this);
                    matchCandidateVM.Render(renderer, flags);
                }
            }
        }

        #endregion
    }
}