internal static CompositionExpression ExpressionToCompositionExpression(Expression expression)
{
var parameters = new CompositionAnimationPropertyCollection();
return(new CompositionExpression {
Expression = GetCompositionString(expression, parameters), Parameters = parameters
});
}
static string GetMethodCallExpression(MethodCallExpression ca, CompositionAnimationPropertyCollection parameters)
{
if (ca.Method.DeclaringType != typeof(CompositionPropertySetExtensions))
{
return(ca.Method.Name + "(" + string.Join(",", ca.Arguments.Select(a => GetCompositionString(a, parameters))) + ")");
}
else
{
return(GetCompositionString(ca.Arguments[0], parameters) + "." + GetCompositionString(ca.Arguments[1], parameters));
}
}
static string GetExpressionWithParameters(Expression exp, CompositionAnimationPropertyCollection parameters)
{
if (exp is BinaryExpression)
{
return("(" + GetCompositionString(exp, parameters) + ")");
}
else
{
return(GetCompositionString(exp, parameters));
}
}
static string GetUnaryExpression(UnaryExpression u, CompositionAnimationPropertyCollection parameters)
{
string operand = null;
switch (u.NodeType)
{
case ExpressionType.Negate:
operand = "!";
break;
case ExpressionType.UnaryPlus:
operand = "+";
break;
case ExpressionType.NegateChecked:
operand = "!";
break;
case ExpressionType.Not:
operand = "!";
break;
case ExpressionType.PreIncrementAssign:
operand = "++";
break;
case ExpressionType.PreDecrementAssign:
operand = "--";
break;
case ExpressionType.Convert:
return(GetCompositionString(u.Operand, parameters));
case ExpressionType.PostIncrementAssign:
return(GetExpressionWithParameters(u.Operand, parameters) + "++");
case ExpressionType.PostDecrementAssign:
return(GetExpressionWithParameters(u.Operand, parameters) + "--");
case ExpressionType.OnesComplement:
operand = "~";
break;
default:
throw new ArgumentException(u.NodeType.ToString());
}
return(operand + GetExpressionWithParameters(u.Operand, parameters));
}
static string GetMemberExpression(MemberExpression m, CompositionAnimationPropertyCollection parameters)
{
if (m.Expression is MemberExpression)
{
return(GetMemberExpression((MemberExpression)m.Expression, parameters) + "." + m.Member.Name);
}
else
{
if (m.Member.DeclaringType.GetTypeInfo().IsGenericType&& m.Member.DeclaringType.GetGenericTypeDefinition() == typeof(ExpressionContext <,>))
{
return("this." + m.Member.Name);
}
else
{
if (!parameters.ContainsKey(m.Member.Name) && m.Member is FieldInfo && m.Expression is ConstantExpression)
{
parameters.Add(m.Member.Name, ((FieldInfo)m.Member).GetValue(((ConstantExpression)m.Expression).Value));
}
return(m.Member.Name);
}
}
}
static string GetCompositionString(Expression exp, CompositionAnimationPropertyCollection parameters)
{
if (exp is BinaryExpression)
{
return(GetBinaryExpression((BinaryExpression)exp, parameters));
}
if (exp is UnaryExpression)
{
return(GetUnaryExpression((UnaryExpression)exp, parameters));
}
switch (exp.NodeType)
{
case ExpressionType.Call:
return(GetMethodCallExpression((MethodCallExpression)exp, parameters));
case ExpressionType.Conditional:
return(GetConditionalExpression((ConditionalExpression)exp, parameters));
case ExpressionType.Constant:
return((exp as ConstantExpression).Value.ToString());
case ExpressionType.Lambda:
return(GetCompositionString(((System.Linq.Expressions.LambdaExpression)exp).Body, parameters));
case ExpressionType.MemberAccess:
return(GetMemberExpression((MemberExpression)exp, parameters));
case ExpressionType.Parameter:
var p = (ParameterExpression)exp;
return(p.Name);
default:
throw new ArgumentException(exp.NodeType.ToString());
}
}
internal static CompositionAnimation ApplyParameters(CompositionAnimation animation, CompositionAnimationPropertyCollection parameters)
{
foreach (var p in parameters.Keys.ToList())
{
var type = parameters[p].GetType();
if (type == typeof(float))
{
animation.SetScalarParameter(p, (float)parameters[p]);
}
else if (parameters[p] is CompositionObject)
{
animation.SetReferenceParameter(p, (CompositionObject)parameters[p]);
}
else if (parameters[p] is CompositionPropertySetWrapper)
{
parameters[p] = ((CompositionPropertySetWrapper)parameters[p]).PropertySet;
animation.SetReferenceParameter(p, (CompositionObject)parameters[p]);
}
else if (type == typeof(Vector2))
{
animation.SetVector2Parameter(p, (Vector2)parameters[p]);
}
else if (type == typeof(Vector3))
{
animation.SetVector3Parameter(p, (Vector3)parameters[p]);
}
else if (type == typeof(Vector4))
{
animation.SetVector4Parameter(p, (Vector4)parameters[p]);
}
else if (type == typeof(Matrix3x2))
{
animation.SetMatrix3x2Parameter(p, (Matrix3x2)parameters[p]);
}
else if (type == typeof(Matrix4x4))
{
animation.SetMatrix4x4Parameter(p, (Matrix4x4)parameters[p]);
}
else if (type == typeof(Quaternion))
{
animation.SetQuaternionParameter(p, (Quaternion)parameters[p]);
}
else if (type == typeof(Color))
{
animation.SetColorParameter(p, (Color)parameters[p]);
}
else
{
parameters[p] = CompositionPropertySetExtensions.ToPropertySet(parameters[p], animation.Compositor);
animation.SetReferenceParameter(p, (CompositionObject)parameters[p]);
}
}
return(animation);
}
static string GetConditionalExpression(ConditionalExpression exp, CompositionAnimationPropertyCollection parameters) => GetCompositionString(exp.Test, parameters) + " ? " + GetCompositionString(exp.IfTrue, parameters) + " : " + GetCompositionString(exp.IfFalse, parameters);
static string GetBinaryExpression(BinaryExpression b, CompositionAnimationPropertyCollection parameters)
{
string operand = null;
switch (b.NodeType)
{
case ExpressionType.Add:
operand = "+";
break;
case ExpressionType.AddChecked:
operand = "+";
break;
case ExpressionType.And:
operand = "&";
break;
case ExpressionType.AndAlso:
operand = "&&";
break;
case ExpressionType.Coalesce:
operand = "??";
break;
case ExpressionType.Divide:
operand = "/";
break;
case ExpressionType.ExclusiveOr:
operand = "||";
break;
case ExpressionType.GreaterThan:
operand = ">";
break;
case ExpressionType.GreaterThanOrEqual:
operand = ">=";
break;
case ExpressionType.LeftShift:
operand = ">>";
break;
case ExpressionType.LessThan:
operand = "<";
break;
case ExpressionType.LessThanOrEqual:
operand = "<=";
break;
case ExpressionType.Modulo:
operand = "%";
break;
case ExpressionType.Multiply:
operand = "*";
break;
case ExpressionType.MultiplyChecked:
operand = "*";
break;
case ExpressionType.NotEqual:
operand = "!=";
break;
case ExpressionType.Or:
operand = "|";
break;
case ExpressionType.OrElse:
operand = "||";
break;
case ExpressionType.RightShift:
operand = "<<";
break;
case ExpressionType.Subtract:
operand = "-";
break;
case ExpressionType.SubtractChecked:
operand = "-";
break;
case ExpressionType.AddAssign:
operand = "+=";
break;
case ExpressionType.AndAssign:
operand = "&=";
break;
case ExpressionType.DivideAssign:
operand = "/=";
break;
case ExpressionType.ExclusiveOrAssign:
operand = "^=";
break;
case ExpressionType.LeftShiftAssign:
operand = "<<=";
break;
case ExpressionType.ModuloAssign:
operand = "%=";
break;
case ExpressionType.MultiplyAssign:
operand = "*=";
break;
case ExpressionType.OrAssign:
operand = "|=";
break;
case ExpressionType.PowerAssign:
operand = "^";
break;
case ExpressionType.RightShiftAssign:
operand = ">>=";
break;
case ExpressionType.SubtractAssign:
operand = "-=";
break;
case ExpressionType.AddAssignChecked:
operand = "+=";
break;
case ExpressionType.MultiplyAssignChecked:
operand = "*=";
break;
case ExpressionType.SubtractAssignChecked:
operand = "-=";
break;
default:
throw new ArgumentException();
}
return(GetExpressionWithParameters(b.Left, parameters) + " " + operand + " " + GetExpressionWithParameters(b.Right, parameters));
}
