/*
 * OLVListItem - A row in an ObjectListView
 *
 * Author: Phillip Piper
 * Date: 31-March-2011 5:53 pm
 *
 * Change log:
 * v2.8
 * 2014-09-27  JPP  - Remove faulty caching of CheckState
 * 2014-05-06  JPP  - Added OLVListItem.Enabled flag
 * vOld
 * 2011-03-31  JPP  - Split into its own file
 * 
 * Copyright (C) 2011-2014 Phillip Piper
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * If you wish to use this code in a closed source application, please contact phillip_piper@bigfoot.com.
 */

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;

namespace BrightIdeasSoftware {

    /// <summary>
    /// OLVListItems are specialized ListViewItems that know which row object they came from,
    /// and the row index at which they are displayed, even when in group view mode. They
    /// also know the image they should draw against themselves
    /// </summary>
    public class OLVListItem : ListViewItem {
        #region Constructors

        /// <summary>
        /// Create a OLVListItem for the given row object
        /// </summary>
        public OLVListItem(object rowObject) {
            this.rowObject = rowObject;
        }

        /// <summary>
        /// Create a OLVListItem for the given row object, represented by the given string and image
        /// </summary>
        public OLVListItem(object rowObject, string text, Object image)
            : base(text, -1) {
            this.rowObject = rowObject;
            this.imageSelector = image;
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets the bounding rectangle of the item, including all subitems
        /// </summary>
        new public Rectangle Bounds {
            get {
                try {
                    return base.Bounds;
                }
                catch (System.ArgumentException) {
                    // If the item is part of a collapsed group, Bounds will throw an exception
                    return Rectangle.Empty;
                }
            }
        }

        /// <summary>
        /// Gets or sets how many pixels will be left blank around each cell of this item
        /// </summary>
        /// <remarks>This setting only takes effect when the control is owner drawn.</remarks>
        public Rectangle? CellPadding {
            get { return this.cellPadding; }
            set { this.cellPadding = value; }
        }
        private Rectangle? cellPadding;

        /// <summary>
        /// Gets or sets how the cells of this item will be vertically aligned
        /// </summary>
        /// <remarks>This setting only takes effect when the control is owner drawn.</remarks>
        public StringAlignment? CellVerticalAlignment {
            get { return this.cellVerticalAlignment; }
            set { this.cellVerticalAlignment = value; }
        }
        private StringAlignment? cellVerticalAlignment;

        /// <summary>
        /// Gets or sets the checkedness of this item.
        /// </summary>
        /// <remarks>
        /// Virtual lists don't handle checkboxes well, so we have to intercept attempts to change them
        /// through the items, and change them into something that will work.
        /// Unfortuneately, this won't work if this property is set through the base class, since
        /// the property is not declared as virtual.
        /// </remarks>
        new public bool Checked {
            get {
                return base.Checked;
            }
            set {
                if (this.Checked != value) {
                    if (value)
                        ((ObjectListView)this.ListView).CheckObject(this.RowObject);
                    else
                        ((ObjectListView)this.ListView).UncheckObject(this.RowObject);
                }
            }
        }

        /// <summary>
        /// Enable tri-state checkbox.
        /// </summary>
        /// <remarks>.NET's Checked property was not built to handle tri-state checkboxes,
        /// and will return True for both Checked and Indeterminate states.</remarks>
        public CheckState CheckState {
            get {
                switch (this.StateImageIndex) {
                    case 0:
                        return System.Windows.Forms.CheckState.Unchecked;
                    case 1:
                        return System.Windows.Forms.CheckState.Checked;
                    case 2:
                        return System.Windows.Forms.CheckState.Indeterminate;
                    default:
                        return System.Windows.Forms.CheckState.Unchecked;
                }
            }
            set {
                switch (value) {
                    case System.Windows.Forms.CheckState.Unchecked:
                        this.StateImageIndex = 0;
                        break;
                    case System.Windows.Forms.CheckState.Checked:
                        this.StateImageIndex = 1;
                        break;
                    case System.Windows.Forms.CheckState.Indeterminate:
                        this.StateImageIndex = 2;
                        break;
                }
            }
        }

        /// <summary>
        /// Gets if this item has any decorations set for it.
        /// </summary>
        public bool HasDecoration {
            get {
                return this.decorations != null && this.decorations.Count > 0;
            }
        }

        /// <summary>
        /// Gets or sets the decoration that will be drawn over this item
        /// </summary>
        /// <remarks>Setting this replaces all other decorations</remarks>
        public IDecoration Decoration {
            get {
                if (this.HasDecoration)
                    return this.Decorations[0];
                else
                    return null;
            }
            set {
                this.Decorations.Clear();
                if (value != null)
                    this.Decorations.Add(value);
            }
        }

        /// <summary>
        /// Gets the collection of decorations that will be drawn over this item
        /// </summary>
        public IList<IDecoration> Decorations {
            get {
                if (this.decorations == null)
                    this.decorations = new List<IDecoration>();
                return this.decorations;
            }
        }
        private IList<IDecoration> decorations;

        /// <summary>
        /// Gets whether or not this row can be selected and activated
        /// </summary>
        public bool Enabled
        {
            get { return this.enabled; }
            internal set { this.enabled = value; }
        }
        private bool enabled;

        /// <summary>
        /// Get or set the image that should be shown against this item
        /// </summary>
        /// <remarks><para>This can be an Image, a string or an int. A string or an int will
        /// be used as an index into the small image list.</para></remarks>
        public Object ImageSelector {
            get { return imageSelector; }
            set {
                imageSelector = value;
                if (value is Int32)
                    this.ImageIndex = (Int32)value;
                else if (value is String)
                    this.ImageKey = (String)value;
                else
                    this.ImageIndex = -1;
            }
        }
        private Object imageSelector;

        /// <summary>
        /// Gets or sets the the model object that is source of the data for this list item.
        /// </summary>
        public object RowObject {
            get { return rowObject; }
            set { rowObject = value; }
        }
        private object rowObject;

        #endregion

        #region Accessing

        /// <summary>
        /// Return the sub item at the given index
        /// </summary>
        /// <param name="index">Index of the subitem to be returned</param>
        /// <returns>An OLVListSubItem</returns>
        public virtual OLVListSubItem GetSubItem(int index) {
            if (index >= 0 && index < this.SubItems.Count)
                return (OLVListSubItem)this.SubItems[index];
            
            return null;
        }


        /// <summary>
        /// Return bounds of the given subitem
        /// </summary>
        /// <remarks>This correctly calculates the bounds even for column 0.</remarks>
        public virtual Rectangle GetSubItemBounds(int subItemIndex) {
            if (subItemIndex == 0) {
                Rectangle r = this.Bounds;
                Point sides = NativeMethods.GetScrolledColumnSides(this.ListView, subItemIndex);
                r.X = sides.X + 1;
                r.Width = sides.Y - sides.X;
                return r;
            }

            OLVListSubItem subItem = this.GetSubItem(subItemIndex);
            return subItem == null ? new Rectangle() : subItem.Bounds;
        }

        #endregion
    }
}