using System.ComponentModel;

namespace FastReport.Dialog
{
    /// <summary>
    /// Base class for controls that may contain child controls.
    /// </summary>
    public partial class ParentControl : DialogControl, IParent
    {
        #region Fields
        private DialogComponentCollection controls;
        #endregion

        #region Properties
        /// <summary>
        /// Gets the collection of child controls.
        /// </summary>
        [Browsable(false)]
        public DialogComponentCollection Controls
        {
            get { return controls; }
        }
        #endregion

        #region IParent
        /// <inheritdoc/>
        public virtual void GetChildObjects(ObjectCollection list)
        {
            foreach (DialogComponentBase c in controls)
            {
                list.Add(c);
            }
        }

        /// <inheritdoc/>
        public virtual bool CanContain(Base child)
        {
            return (child is DialogComponentBase);
        }

        /// <inheritdoc/>
        public virtual void AddChild(Base child)
        {
            if (child is DialogComponentBase)
                controls.Add(child as DialogComponentBase);
        }

        /// <inheritdoc/>
        public virtual void RemoveChild(Base child)
        {
            if (child is DialogComponentBase)
                controls.Remove(child as DialogComponentBase);
        }

        /// <inheritdoc/>
        public virtual int GetChildOrder(Base child)
        {
            return controls.IndexOf(child as DialogComponentBase);
        }

        /// <inheritdoc/>
        public virtual void SetChildOrder(Base child, int order)
        {
            int oldOrder = child.ZOrder;
            if (oldOrder != -1 && order != -1 && oldOrder != order)
            {
                if (order > controls.Count)
                    order = controls.Count;
                if (oldOrder <= order)
                    order--;
                controls.Remove(child as DialogComponentBase);
                controls.Insert(order, child as DialogComponentBase);
            }
        }

        /// <inheritdoc/>
        public virtual void UpdateLayout(float dx, float dy)
        {
            // do nothing
        }
        #endregion

        /// <summary>
        /// Initializes a new instance of the <b>ParentControl</b> class with default settings. 
        /// </summary>
        public ParentControl()
        {
            controls = new DialogComponentCollection(this);
        }
    }
}