using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace WeifenLuo.WinFormsUI.Docking {
  public class DockPaneCollection : ReadOnlyCollection<DockPane> {
    internal DockPaneCollection()
      : base(new List<DockPane>()) {
    }

    internal int Add(DockPane pane) {
      if (Items.Contains(pane))
        return Items.IndexOf(pane);

      Items.Add(pane);
      return Count - 1;
    }

    internal void AddAt(DockPane pane, int index) {
      if (index < 0 || index > Items.Count - 1)
        return;

      if (Contains(pane))
        return;

      Items.Insert(index, pane);
    }

    internal void Dispose() {
      for (int i = Count - 1; i >= 0; i--)
        this[i].Close();
    }

    internal void Remove(DockPane pane) {
      Items.Remove(pane);
    }
  }
}