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GridRow.cs
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GridRow.cs
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/* Copyright (c) Citrix Systems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted provided
* that the following conditions are met:
*
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
namespace XenAdmin.Controls.CustomGridView
{
public class GridRow : IComparable<GridRow>
{
public Dictionary<string, GridItemBase> Items = new Dictionary<string, GridItemBase>();
public List<GridRow> Rows = new List<GridRow>();
public static Image ExpandedImage = Images.StaticImages.expanded_triangle;
public static Image ShrunkenImage = Images.StaticImages.contracted_triangle;
public string OpaqueRef;
public object Tag;
public int Priority = -1; // -1 => dont care, 0 => highest
public readonly Color BackColor;
public Pen BorderPen;
protected RowState state = RowState.Expanded;
private readonly int rowHeight;
private GridRow parentrow;
private GridView gridview;
public GridRow(int rowHeight)
: this(rowHeight, SystemColors.Window, null)
{
}
public GridRow(int rowHeight, Color BackColor, Pen Borderpen)
{
this.rowHeight = rowHeight;
this.BackColor = BackColor;
this.BorderPen = Borderpen;
this.Tag = null;
}
// Set the row's gridview and add the row to the gridview's row list
public virtual GridView GridView
{
get
{
return gridview;
}
set
{
gridview = value;
foreach (GridRow row in Rows)
{
row.GridView = value;
}
}
}
public GridRow ParentRow
{
get
{
return parentrow;
}
set
{
parentrow = value;
}
}
public bool Expanded
{
get
{
return (State & RowState.Expanded) > 0;
}
set
{
if (value == Expanded)
return;
State ^= RowState.Expanded;
}
}
public bool Selected
{
get
{
return (State & RowState.Selected) > 0;
}
set
{
if (value == Selected)
return;
State ^= RowState.Selected;
}
}
public RowState State
{
get { return state; }
set { state = value; }
}
// We return the path as a string like "foo::bar::baz". It would be more theoretically
// correct to return a List<string> but then we would have to define comparison functions
// and hash functions for it. This has a very small chance of clashes, and is much simpler.
public string Path
{
get
{
string parentPath = (ParentRow == null ? String.Empty : (ParentRow.Path + "::"));
return (parentPath + OpaqueRef);
}
}
public bool HasChildren
{
get
{
return Rows.Count > 0;
}
}
public bool HasVisibleChildren
{
get
{
return (Expanded && HasChildren);
}
}
// Iterate over all rows including child rows, in display order
public IEnumerable<GridRow> RowsAndChildren
{
get
{
foreach (GridRow row in Rows)
{
yield return row;
foreach (GridRow child in row.RowsAndChildren)
yield return child;
}
}
}
private int RowSeparation = 4; // leave this between most rows
private int GroupSeparation = 8; // leave this instead after the last row in a group of children
public int SpaceAfter
{
get
{
if (HasVisibleChildren)
return GroupSeparation;
else
return RowSeparation;
}
}
private int LeftOffset
{
get
{
return GridView.LeftOffset;
}
}
private bool HasLeftExpander
{
get
{
return (HasChildren && GridView.HasLeftExpanders);
}
}
public virtual void AddItem(string colname, GridItemBase item)
{
Items[colname] = item;
item.Row = this;
}
public virtual void RemoveItem(string colname)
{
Items.Remove(colname);
}
public void AddRow(GridRow row)
{
Rows.Add(row);
row.ParentRow = this;
}
public int RowHeight
{
get
{
return rowHeight;
}
}
public int RowAndChildrenHeight
{
get
{
int height = RowHeight;
if (HasVisibleChildren)
{
height += RowSeparation;
int children = Rows.Count;
for(int i = 0; i < children; i++)
{
height += Rows[i].RowAndChildrenHeight;
if (i < children - 1)
height += Rows[i].SpaceAfter;
}
}
return height;
}
}
public void OnPaint(RowPaintArgs e)
{
if (GridView == null || GridView.HeaderRow == null)
return;
if (HasLeftExpander)
{
// paint background
using (Brush brush = new SolidBrush(BackColor))
{
e.Graphics.FillRectangle(brush, e.Rectangle);
}
if (BorderPen != null)
e.Graphics.DrawRectangle(BorderPen, e.Rectangle);
Image im = Expanded ? ExpandedImage : ShrunkenImage;
e.Graphics.DrawImage(im, e.Rectangle.X + im.Width, e.Rectangle.Y + im.Height, im.Width, im.Height);
}
// paint this row
int totalHeight = RowHeight;
int left = e.Rectangle.Left + LeftOffset;
int top = e.Rectangle.Top;
foreach(string col in GridView.HeaderRow.Columns)
{
GridItemBase item = GetItem(col);
int itemwidth = GridView.GetColumnWidth(col, ItemColumnSpan(item,col));
if (left >= e.ClipRectangle.Left - itemwidth && left <= e.ClipRectangle.Right + itemwidth)
{
item.OnPaint(new ItemPaintArgs(e.Graphics, new Rectangle(left, top, itemwidth, totalHeight),
Selected ? ItemState.Selected : ItemState.Normal));
}
left += GridView.GetColumnWidth(col, 1);
}
// paint subrows
if (HasVisibleChildren)
{
top += RowHeight + RowSeparation;
foreach (GridRow row in Rows)
{
int rowheight = row.RowAndChildrenHeight;
if (top >= e.ClipRectangle.Top - rowheight && top <= e.ClipRectangle.Bottom + rowheight)
row.OnPaint(new RowPaintArgs(e.Graphics, e.ClipRectangle, new Rectangle(e.Rectangle.Left, top, e.Rectangle.Width, rowheight)));
top += rowheight + row.SpaceAfter;
}
}
}
internal int ItemColumnSpan(GridItemBase item, string col)
{
if(GridView == null || GridView.HeaderRow == null)
return 1;
int colindex = GridView.HeaderRow.Columns.IndexOf(col);
int span = 1;
for (int i = colindex + 1; i < colindex + item.RowSpan; i++)
{
if (GridView.HeaderRow.Columns.Count <= i)
break;
string name = GridView.HeaderRow.Columns[i];
if (!Items.ContainsKey(name))
{
span++;
continue;
}
if (Items[name].Empty)
span++;
else
break;
}
return span;
}
internal GridItemBase GetItem(string col)
{
if (!Items.ContainsKey(col))
return new GridEmptyItem();
return Items[col];
}
// A mouse click has not be intercepted by a click handler on a cell,
// so represents a row-select. Some actions have to be done at mouse-down
// time and some at mouse-up time (this is important when dragging, because
// we have to have the right stuff selected when the drag starts).
//
internal void OnSelectMouseDown()
{
// If CTRL is down (with any other keys), toggle the current row state.
Keys keys = Control.ModifierKeys;
if ((keys & Keys.Control) != Keys.None)
{
Selected = !Selected;
GridView.LastClickedRow = this;
GridView.Refresh();
}
// Else if Shift is down, ask GridView to select the range.
// NB Don't reset the LastClickedRow.
else if ((keys & Keys.Shift) != Keys.None)
{
GridView.SelectRowRange(this);
GridView.Refresh();
}
// Otherwise unselect all other rows and select this row.
// But if the row is already selected, we wait until mouse-up time.
else if (!Selected)
{
GridView.UnselectAllRows();
Selected = true;
GridView.LastClickedRow = this;
GridView.Refresh();
}
}
internal void OnSelectMouseUp()
{
// If CTRL or Shift is down, we've already handled the action in OnSelectMouseDown().
if ((Control.ModifierKeys & (Keys.Control | Keys.Shift)) != Keys.None)
return;
// With no modifier keys, we select this row and unselect all other rows.
// (If we mouse-downed in the same place, the row is already selected, so we
// don't select it again).
GridView.UnselectAllRowsExcept(this);
GridView.LastClickedRow = this;
}
internal void OnMouseButtonAction(Point point, MouseButtonAction type)
{
if (HasLeftExpander)
{
Image image = Expanded ? ExpandedImage : ShrunkenImage;
Size s = new Size(image.Width * 3, image.Height * 3);
Rectangle r = new Rectangle(new Point(), s);
if (r.Contains(point))
{
if (type == MouseButtonAction.MouseDown)
{
Expanded = !Expanded;
GridView.Refresh();
}
else
return;
}
}
if (point.Y < RowHeight) // user has clicked on the row
{
Point p;
GridItemBase item = FindItemFromPoint(point, out p);
if (item == null)
return;
item.OnMouseButtonAction(p, type);
return;
}
else // user has clicked on a sub row of the row
{
Point p;
GridRow row = FindRowFromPoint(point, out p);
if (row == null)
return;
row.OnMouseButtonAction(p, type);
}
}
private GridRow FindRowFromPoint(Point point, out Point p)
{
if (HasVisibleChildren)
{
int height = RowHeight + RowSeparation;
foreach (GridRow row in Rows)
{
if (point.Y >= height && point.Y < height + row.RowAndChildrenHeight)
{
p = new Point(point.X, point.Y - height);
return row;
}
height += row.RowAndChildrenHeight + row.SpaceAfter;
}
}
p = new Point();
return null;
}
internal GridItemBase FindItemFromPoint(Point point, out Point p)
{
int width = LeftOffset;
int skipping = 0;
foreach (string col in GridView.HeaderRow.Columns)
{
GridItemBase item = GetItem(col);
if (item is GridEmptyItem && skipping > 0)
{
skipping--;
continue;
}
skipping = item.RowSpan - 1;
int itwidth = GridView.GetColumnWidth(col, item.RowSpan);
if (point.X >= width && point.X < width + itwidth)
{
p = new Point(point.X - width, point.Y);
return item;
}
width += itwidth;
}
p = new Point();
return null;
}
internal Cursor Cursor
{
set
{
GridView.Cursor = value;
}
}
/*
* These properties are used to track mouse events over items of subrows.
* Only one of these can be valid at once
*/
private GridItemBase LastItem;
private GridRow LastSubRow;
/*
* Asserts are here to ensure these events happen in order.
* That order being OnEnter, OnMouseMove, OnLeave.
*/
internal void OnEnter(Point point)
{
System.Diagnostics.Trace.Assert(LastSubRow == null);
System.Diagnostics.Trace.Assert(LastItem == null);
Point p;
if (point.Y > RowHeight)
{
LastSubRow = FindRowFromPoint(point, out p);
if(LastSubRow == null)
return;
LastSubRow.OnEnter(p);
}
else
{
LastItem = FindItemFromPoint(point, out p);
if (LastItem == null)
return;
LastItem.OnEnter(p);
}
}
internal void OnMouseMove(Point point)
{
if (HasLeftExpander)
{
Image image = Expanded ? ExpandedImage : ShrunkenImage;
Rectangle r = new Rectangle(image.Width, image.Height, image.Width, image.Height);
Cursor = r.Contains(point) ? Cursors.Hand : Cursors.Default;
}
// Make sure only one is valid
System.Diagnostics.Trace.Assert(LastItem == null || LastSubRow == null);
Point p;
if (point.Y > RowHeight)
{
if (LastItem != null)
{
LastItem.OnLeave();
LastItem = null;
}
GridRow row = FindRowFromPoint(point, out p);
if (row != null && LastSubRow == row)
{
LastSubRow.OnMouseMove(p);
return;
}
if (LastSubRow != null)
LastSubRow.OnLeave();
LastSubRow = row;
if (LastSubRow != null)
LastSubRow.OnEnter(p);
}
else
{
if (LastSubRow != null)
{
LastSubRow.OnLeave();
LastSubRow = null;
}
GridItemBase item = FindItemFromPoint(point, out p);
if (item != null && LastItem == item)
{
LastItem.OnMouseMove(p);
return;
}
if (LastItem != null)
LastItem.OnLeave();
LastItem = item;
if (LastItem != null)
LastItem.OnEnter(p);
}
}
internal void OnLeave()
{
// Make sure only one is valid
System.Diagnostics.Trace.Assert(LastItem == null || LastSubRow == null);
if (LastItem != null)
{
LastItem.OnLeave();
LastItem = null;
}
if (LastSubRow != null)
{
LastSubRow.OnLeave();
LastSubRow = null;
}
}
public virtual int CompareTo(GridRow other)
{
if (Priority != other.Priority)
{
if (Priority == -1)
return 1;
if (other.Priority == -1)
return -1;
return Priority - other.Priority;
}
GridItemBase _1, _2;
int val;
if (GridView != null && GridView.HeaderRow != null)
{
foreach (SortParams sp in GridView.HeaderRow.CompareOrder)
{
if (!Items.ContainsKey(sp.Column) || !other.Items.ContainsKey(sp.Column))
continue;
_1 = Items[sp.Column];
_2 = other.Items[sp.Column];
val = _1.CompareTo(_2);
if (val != 0)
return sp.SortOrder == SortOrder.Descending ? -val : val;
}
if (GridView.HeaderRow.DefaultSortColumn != null)
{
string def = GridView.HeaderRow.DefaultSortColumn.ColumnName;
_1 = Items[def];
_2 = other.Items[def];
val = _1.CompareTo(_2);
if (val != 0)
return GridView.HeaderRow.DefaultSortColumn.Sort == SortOrder.Descending ? -val : val;
}
}
if (OpaqueRef == other.OpaqueRef)
return 0;
return OpaqueRef.CompareTo(other.OpaqueRef); // fall back on opaque ref
}
internal void Sort()
{
Rows.Sort();
if (Expanded)
{
foreach (GridRow row in Rows)
{
row.Sort();
}
}
}
internal void SaveExpandedState(List<String> state)
{
if (!Expanded)
state.Add(OpaqueRef);
foreach (GridRow row in Rows)
row.SaveExpandedState(state);
}
internal void RestoreExpandedState(List<string> expandedState)
{
if (Rows.Count > 0 && expandedState.Contains(OpaqueRef))
Expanded = false;
foreach (GridRow row in Rows)
row.RestoreExpandedState(expandedState);
}
public override bool Equals(object obj)
{
if (!(obj is GridRow row))
return false;
return OpaqueRef == row.OpaqueRef;
}
public override int GetHashCode()
{
return (OpaqueRef != null ? OpaqueRef.GetHashCode() : 0);
}
}
// The state the row should be drawn in
[Flags]
public enum RowState { None = 0, /* Visible = 1, Disabled = 2, */ Selected = 4, Expanded = 8 } // others not implemented
public class RowPaintArgs
{
public readonly Graphics Graphics;
public readonly Rectangle ClipRectangle;
public readonly Rectangle Rectangle;
public RowPaintArgs(Graphics graphics, Rectangle cliprectangle, Rectangle rectangle)
{
Graphics = graphics;
ClipRectangle = cliprectangle;
Rectangle = rectangle;
}
}
// OK, I admit it, it's just a typedef
public class GridRowCollection : List<GridRow>
{
}
}