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Column.cs

//
// Column.cs
//
// Author:
//   Aaron Bockover <abockover@novell.com>
//
// Copyright (C) 2007 Novell, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Collections;
using System.Collections.Generic;
using Gtk;

using Hyena;
using Hyena.Data;

namespace Hyena.Data.Gui
{
    public class Column : ColumnDescription, IEnumerable<ColumnCell>
    {
        private ColumnCell header_cell;
        private List<ColumnCell> cells = new List<ColumnCell> ();

        private int min_width = 0;
        private int max_width = Int32.MaxValue;

        public Column (ColumnDescription description) :
            this (description, new ColumnCellText (description.Property, true))
        {
        }

        public Column (ColumnDescription description, ColumnCell cell) :
            this (description.Title, cell, description.Width, description.Visible)
        {
        }

        public Column (string title, ColumnCell cell, double width)
            : this (title, cell, width, true)
        {
        }

        public Column (string title, ColumnCell cell, double width, bool visible)
            : this (null, title, cell, width, visible)
        {
        }

        public Column (ColumnCell headerCell, string title, ColumnCell cell, double width)
            : this (headerCell, title, cell, width, true)
        {
        }

        public Column (ColumnCell headerCell, string title, ColumnCell cell, double width, bool visible)
            : this (headerCell, title, cell, width, visible, 0, Int32.MaxValue)
        {
        }

        public Column (ColumnCell headerCell, string title, ColumnCell cell, double width, bool visible, int minWidth, int maxWidth)
            : base (cell.Property, title, width, visible)
        {
            min_width = minWidth;
            max_width = maxWidth;
            header_cell = headerCell ?? new ColumnHeaderCellText (HeaderCellDataHandler);

            ColumnCellText header_text = header_cell as ColumnCellText;
            ColumnCellText cell_text = cell as ColumnCellText;
            if (header_text != null && cell_text != null) {
                header_text.Alignment = cell_text.Alignment;
            }

            PackStart (cell);
        }

        private Column HeaderCellDataHandler ()
        {
            return this;
        }

        public void PackStart (ColumnCell cell)
        {
            cells.Insert (0, cell);
        }

        public void PackEnd (ColumnCell cell)
        {
            cells.Add (cell);
        }

        public ColumnCell GetCell (int index)
        {
            return cells[index];
        }

        public void RemoveCell (int index)
        {
            cells.RemoveAt (index);
        }

        public void ClearCells ()
        {
            cells.Clear ();
        }

        IEnumerator IEnumerable.GetEnumerator ()
        {
            return cells.GetEnumerator ();
        }

        IEnumerator<ColumnCell> IEnumerable<ColumnCell>.GetEnumerator ()
        {
            return cells.GetEnumerator ();
        }

        public ColumnCell HeaderCell {
            get { return header_cell; }
            set { header_cell = value; }
        }

        public void CalculateWidths (Pango.Layout layout, bool headerVisible, int headerHeight)
        {
            bool min_was_zero = MinWidth == 0;
            bool was_size_req = false;
            ISizeRequestCell sr_cell = cells[0] as ISizeRequestCell;
            if (sr_cell != null && sr_cell.RestrictSize) {
                int min_w, max_w;
                sr_cell.GetWidthRange (layout, out min_w, out max_w);
                MinWidth = min_w == -1 ? MinWidth : min_w;
                MaxWidth = max_w == -1 ? MaxWidth : max_w;
                was_size_req = true;
            }

            if (headerVisible && (min_was_zero || was_size_req) && !String.IsNullOrEmpty (Title)) {
                int w, h;
                layout.SetText (Title);
                //column_layout.SetText ("\u2026"); // ellipsis char
                layout.GetPixelSize (out w, out h);

                // Pretty sure the 3* is needed here only b/c of the " - 8" in ColumnCellText;
                // See TODO there
                w += 3 * ColumnHeaderCellText.Spacing;
                if (this is ISortableColumn) {
                    w += ColumnHeaderCellText.GetArrowWidth (headerHeight);
                }

                MinWidth = Math.Max (MinWidth, w);

                // If the min/max are sufficiently close (arbitrarily choosen as < 8px) then
                // make them equal, so that the column doesn't appear resizable but in reality is on barely.
                if (MaxWidth - MinWidth < 8) {
                    MinWidth = MaxWidth;
                }
            }
        }

        public int MinWidth {
            get { return min_width; }
            set {
                min_width = value;
                if (value > max_width) {
                    max_width = value;
                }
            }
        }

        public int MaxWidth {
            get { return max_width; }
            set {
                max_width = value;
                if (value < min_width) {
                    min_width = value;
                }
            }
        }

        private string id;
        public string Id {
            get {
                if (id == null) {
                    id = GetCell (0).SubProperty ?? GetCell (0).Property;
                    id = StringUtil.CamelCaseToUnderCase (id);
                }
                return id;
            }
            set { id = value; }
        }
    }
}

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