Ooui-tws-port/Ooui/Node.cs

131 lines
3.9 KiB
C#

using System;
using System.Collections.Generic;
using System.Linq;
namespace Ooui
{
public abstract class Node
{
public string Id { get; private set; } = GenerateId ();
public HtmlMapping Mapping { get; private set; }
readonly List<Node> children = new List<Node> ();
readonly List<Message> messages = new List<Message> ();
readonly List<Message> stateMessages = new List<Message> ();
public Node ()
{
Mapping = HtmlMapping.Get (GetType ());
LogCreate ();
}
public Node AppendChild (Node newChild)
{
return InsertBefore (newChild, null);
}
public Node ParentNode { get; private set; }
public Node InsertBefore (Node newChild, Node referenceChild)
{
if (referenceChild == null) {
children.Add (newChild);
}
else {
var index = children.IndexOf (referenceChild);
if (index < 0) {
throw new ArgumentException ("Reference must be a child of this element", nameof(referenceChild));
}
children.Insert (index, newChild);
}
newChild.ParentNode = this;
LogCall ("insertBefore", newChild, referenceChild);
return newChild;
}
public Node RemoveChild (Node child)
{
if (!children.Remove (child)) {
throw new ArgumentException ("Child not contained in this element", nameof(child));
}
child.ParentNode = null;
LogCall ("removeChild", child);
return child;
}
protected void Log (Message message)
{
messages.Add (message);
switch (message.MessageType) {
case MessageType.Create:
stateMessages.Add (message);
break;
case MessageType.Set:
{
var old = stateMessages.FirstOrDefault (
x => x.MessageType == MessageType.Set &&
x.Member == message.Member);
if (old != null) {
stateMessages.Remove (old);
}
stateMessages.Add (message);
}
break;
}
}
protected void LogCreate ()
{
Log (new Message {
MessageType = MessageType.Create,
TargetId = Id,
Value = Mapping.TagName,
});
}
protected void LogCall (string methodName, params object[] args)
{
Log (new Message {
MessageType = MessageType.Call,
TargetId = Id,
Member = methodName,
});
}
protected void LogSet (string propertyName, object value)
{
var m = new Message {
MessageType = MessageType.Set,
TargetId = Id,
Member = Mapping.GetMemberPath (propertyName),
};
m.SetValue (value);
Log (m);
}
protected bool SetProperty<T> (ref T backingStore, T newValue, string propertyName = "")
{
if (!backingStore.Equals (newValue)) {
backingStore = newValue;
LogSet (propertyName, newValue);
return true;
}
return false;
}
const string IdChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
static string GenerateId ()
{
var rand = new Random();
var chars = new char[8];
for (var i = 0; i < chars.Length; i++) {
chars[i] = IdChars[rand.Next(0, IdChars.Length)];
}
return new string(chars);
}
}
}