/// <summary>
/// Retrieves the size of a rectangular area into which a control can be fitted.
/// </summary>
/// <param name="container">The container.</param>
/// <param name="proposedSize">The custom-sized area for a control.</param>
/// <returns>An ordered pair of type <see cref="Size"/> representing the width and height of a rectangle.</returns>
public Size GetPreferredSize(ControlListBase container, Size proposedSize)
{
if (lastLayout != proposedSize)
{
Layout(container, new LayoutEventArgs(container, null), proposedSize);
}
return(idealSize);
}
private bool Layout(ControlListBase parent, LayoutEventArgs layoutEventArgs, Size proposedSize)
{
if (parent == null)
{
throw new InvalidCastException(nameof(ColumnLayoutEngine) + " can only be used to layout controls derived from " + nameof(ControlListBase));
}
if (proposedSize == Size.Empty)
{
proposedSize = parent.ClientSize;
}
if (parent.BaseItems != null && parent.BaseItems.Count > 0)
{
System.Diagnostics.Debug.WriteLine(parent.Name + ": Layout:");
System.Diagnostics.Debug.WriteLine($" ClientSize:{proposedSize}, Margin:{parent.Margin}, Padding:{parent.Padding}, Cols:{parent.RepeatColumns}, Spacing:{parent.ItemSpacing}, Items:{parent.BaseItems.Count}, Dir:{parent.RepeatDirection}, Even:{parent.SpaceEvenly}");
ItemBounds.Clear();
using (var g = parent.CreateGraphics())
{
// Determine the start coordinate of each column
var colWidth = (parent.ClientSize.Width - parent.Padding.Horizontal - ((parent.RepeatColumns - 1) * parent.ItemSpacing.Width)) / parent.RepeatColumns;
var colPos = new Point[parent.RepeatColumns];
for (var x = 0; x < parent.RepeatColumns; x++)
{
colPos[x] = new Point(parent.Padding.Left + (x * (colWidth + parent.ItemSpacing.Width)), parent.Padding.Top);
}
// Get the base height of all items and the max height
var maxItemHeight = 0;
idealSize.Height = 0;
var maxSize = new Size(colWidth, 0);
for (var i = 0; i < parent.BaseItems.Count; i++)
{
var sz = parent.MeasureItem(g, i, maxSize);
ItemBounds[i] = new Rectangle(Point.Empty, sz);
// Calculate maximum item height
maxItemHeight = Math.Max(maxItemHeight, sz.Height);
}
// Calculate the positions of each item
var curCol = 0;
for (var i = 0; i < parent.BaseItems.Count; i++)
{
// Set bounds of the item
ItemBounds[i] = new Rectangle(colPos[curCol], ItemBounds[i].Size);
// Set top position of next item
colPos[curCol].Y += (parent.SpaceEvenly ? maxItemHeight : ItemBounds[i].Height) + parent.ItemSpacing.Height;
if (parent.RepeatDirection == RepeatDirection.Horizontal)
{
if (++curCol == parent.RepeatColumns)
{
curCol = 0;
}
}
// If parent.ItemSpacing evenly we can determine all locations now by changing column count at pure divisions
/*if (parent.SpaceEvenly && parent.RepeatDirection == GroupControls.RepeatDirection.Vertical && i > 0)
* {
* if (i % (parent.BaseItems.Count / parent.RepeatColumns) == 0 && curCol <= (parent.BaseItems.Count % parent.RepeatColumns))
* curCol++;
* }*/
}
// Split vertical parent.RepeatColumns and reset positions of items
if (parent.RepeatDirection == RepeatDirection.Vertical && parent.RepeatColumns > 1)
{
var idealColHeight = colPos[0].Y / parent.RepeatColumns;
var thisColBottom = idealColHeight;
var y = parent.Padding.Top + parent.Margin.Top;
for (var i = 0; i < parent.BaseItems.Count; i++)
{
var iBounds = ItemBounds[i];
var nBounds = Rectangle.Empty;
if ((i + 1) < parent.BaseItems.Count)
{
nBounds = ItemBounds[i + 1];
}
if (curCol > 0)
{
ItemBounds[i] = new Rectangle(new Point(colPos[curCol].X, y), ItemBounds[i].Size);
}
colPos[curCol].Y = ItemBounds[i].Bottom + parent.ItemSpacing.Height;
if ((iBounds.Bottom > thisColBottom || nBounds.Bottom > thisColBottom) && (curCol + 1 < parent.RepeatColumns))
{
if (Math.Abs(iBounds.Bottom - idealColHeight) < Math.Abs(nBounds.Bottom - idealColHeight))
{
y = parent.Padding.Top;
curCol++;
thisColBottom = iBounds.Bottom + parent.ItemSpacing.Height + idealColHeight;
}
}
else
{
y += (parent.SpaceEvenly ? maxItemHeight : ItemBounds[i].Height) + parent.ItemSpacing.Height;
}
}
}
// Set ideal height
idealSize.Height = 0;
for (var c = 0; c < parent.RepeatColumns; c++)
{
if (idealSize.Height < colPos[c].Y)
{
idealSize.Height = colPos[c].Y;
}
}
idealSize.Height = idealSize.Height - parent.ItemSpacing.Height + parent.Padding.Bottom;
}
// Set scroll height and autosize to ideal height
parent.AutoScrollMinSize = new Size(parent.ClientRectangle.Width, idealSize.Height);
if (parent.AutoSize)
{
parent.Height = idealSize.Height;
}
System.Diagnostics.Debug.WriteLine(" " + string.Join(" ", Array.ConvertAll(ItemBounds.ToArray(), r => $"({r})")));
}
return(parent.AutoSize);
}
private bool NewLayout(ControlListBase parent, LayoutEventArgs layoutEventArgs, Size proposedSize)
{
if (parent == null)
{
throw new InvalidCastException(nameof(ColumnLayoutEngine) + " can only be used to layout controls derived from " + nameof(ControlListBase));
}
if (proposedSize == Size.Empty)
{
proposedSize = parent.ClientSize;
}
if (parent.BaseItems != null && parent.BaseItems.Count > 0)
{
var parentWidthPinned = parent.Dock != DockStyle.None || (parent.Anchor & (AnchorStyles.Left | AnchorStyles.Right)) != 0;
System.Diagnostics.Debug.WriteLine(parent.Name + ": Layout: ");
System.Diagnostics.Debug.WriteLine($" ClientSize:{proposedSize}, Margin:{parent.Margin}, Padding:{parent.Padding}, Cols:{parent.RepeatColumns}, Spacing:{parent.ItemSpacing}, Items:{parent.BaseItems.Count}, Dir:{parent.RepeatDirection}, Even:{parent.SpaceEvenly}");
ItemBounds.Clear();
using (var g = parent.CreateGraphics())
{
idealSize = proposedSize;
// Determine starting width of column
var colWidth = (proposedSize.Width - parent.Padding.Horizontal - ((parent.RepeatColumns - 1) * parent.ItemSpacing.Width)) / parent.RepeatColumns;
// Get the min width of all items
var maxMinW = 0;
var minSz = new Size[parent.BaseItems.Count];
var wsz = new Size(1, int.MaxValue);
for (var i = 0; i < parent.BaseItems.Count; i++)
{
minSz[i] = parent.MeasureItem(g, i, wsz);
maxMinW = Math.Max(maxMinW, minSz[i].Width);
}
// Determine the column for each item
var itemCol = new int[parent.BaseItems.Count];
for (var i = 0; i < parent.BaseItems.Count; i++)
{
if (parent.RepeatDirection == RepeatDirection.Horizontal)
{
itemCol[i] = i % parent.RepeatColumns;
}
else
{
itemCol[i] = i / (int)Math.Ceiling(parent.BaseItems.Count / (decimal)parent.RepeatColumns);
}
}
// If not spaced evenly, then balance the columns based on height
if (!parent.SpaceEvenly)
{
// Determine total height of all items
// Determine max height of each column
// Working backwards, fit each item into columns with spillover on Column 1
}
// Get the min width of each column
var minColWidth = new int[parent.RepeatColumns];
var maxColWidth = 0;
var totMinW = 0;
if (parent.VariableColumnWidths)
{
for (var i = 0; i < parent.BaseItems.Count; i++)
{
var col = itemCol[i];
minColWidth[col] = Math.Max(minColWidth[col], minSz[i].Width);
maxColWidth = Math.Max(maxColWidth, minColWidth[col]);
}
for (var i = 0; i < parent.RepeatColumns; i++)
{
totMinW += minColWidth[i];
}
}
else
{
for (var i = 0; i < parent.RepeatColumns; i++)
{
minColWidth[i] = maxMinW;
}
maxColWidth = Math.Min(maxMinW, colWidth);
totMinW = parent.RepeatColumns * maxColWidth;
}
totMinW += ((parent.RepeatColumns - 1) * parent.ItemSpacing.Width) + parent.Padding.Horizontal;
// Determine the start coordinate of each column
var colPos = new Point[parent.RepeatColumns];
var xPos = 0;
for (var x = 0; x < parent.RepeatColumns; x++)
{
var cWidth = maxColWidth;
if (parent.VariableColumnWidths && parent.AutoSize && !parentWidthPinned)
{
cWidth = minColWidth[x];
}
else if (!parent.VariableColumnWidths && (parentWidthPinned || parent.AutoSize))
{
cWidth = maxColWidth;
}
colPos[x] = new Point(parent.Padding.Left + xPos, parent.Padding.Top);
xPos += cWidth + parent.ItemSpacing.Width;
}
// Set the width value based on AutoSize, Dock and SpaceEvenly properties
for (var i = 0; i < parent.BaseItems.Count; i++)
{
minSz[i].Width = Math.Min(minSz[i].Width, minColWidth[itemCol[i]]);
}
/*int totMinW = 0;
* if (parent.AutoSize && !parentWidthPinned)
* {
* for (int i = 0; i < parent.BaseItems.Count; i++)
* {
* if (!parent.VariableColumnWidths)
* minSz[i].Width = minColWidth[itemCol[i]];
* totMinW += minSz[i].Width;
* }
* }
* else
* {
* for (int i = 0; i < parent.BaseItems.Count; i++)
* {
* minSz[i].Width = parentWidthPinned ? colWidth : Math.Max(colWidth, maxMinCol);
* totMinW += minSz[i].Width;
* }
* }
* totMinW += ((parent.RepeatColumns - 1) * parent.ItemSpacing.Width) + parent.Padding.Horizontal;*/
/*// Get min width for all parent.RepeatColumns
* int maxMinCol = 0;
* int totMinW = 0;
* for (int i = 0; i < parent.RepeatColumns; i++)
* {
* maxMinCol = Math.Max(maxMinCol, minColWidth[i]);
* totMinW += minColWidth[i];
* }*/
// Reset ideal width if needed
if (!parentWidthPinned)
{
idealSize.Width = totMinW;
}
// Get the base height of all items and the max height
var maxItemHeight = 0;
idealSize.Height = 0;
for (var i = 0; i < parent.BaseItems.Count; i++)
{
minSz[i].Height = 0;
var sz = parent.MeasureItem(g, i, minSz[i]);
ItemBounds[i] = new Rectangle(Point.Empty, sz);
maxItemHeight = Math.Max(maxItemHeight, sz.Height);
}
// Calculate the positions of each item
for (var i = 0; i < parent.BaseItems.Count; i++)
{
var curCol = itemCol[i];
// Set bounds of the item
ItemBounds[i] = new Rectangle(colPos[curCol], ItemBounds[i].Size);
// Set top position of next item
colPos[curCol].Y += (parent.SpaceEvenly ? maxItemHeight : ItemBounds[i].Height) + parent.ItemSpacing.Height;
}
// Split vertical parent.RepeatColumns and reset positions of items
/*if (parent.RepeatDirection == GroupControls.RepeatDirection.Vertical && parent.RepeatColumns > 1)
* {
* int idealColHeight = colPos[0].Y / parent.RepeatColumns;
* int thisColBottom = idealColHeight;
* int y = parent.Padding.Top + parent.Margin.Top;
* for (int i = 0; i < parent.BaseItems.Count; i++)
* {
* Rectangle iBounds = itemBounds[i];
* Rectangle nBounds = Rectangle.Empty;
* if ((i + 1) < parent.BaseItems.Count)
* nBounds = itemBounds[i + 1];
*
* if (curCol > 0)
* itemBounds[i] = new Rectangle(new Point(colPos[curCol].X, y), itemBounds[i].Size);
* colPos[curCol].Y = itemBounds[i].Bottom + parent.ItemSpacing.Height;
*
* if ((iBounds.Bottom > thisColBottom || nBounds.Bottom > thisColBottom) && (curCol + 1 < parent.RepeatColumns))
* {
* if (Math.Abs(iBounds.Bottom - idealColHeight) < Math.Abs(nBounds.Bottom - idealColHeight))
* {
* y = parent.Padding.Top;
* curCol++;
* thisColBottom = iBounds.Bottom + parent.ItemSpacing.Height + idealColHeight;
* }
* }
* else
* {
* y += (parent.SpaceEvenly ? maxItemHeight : itemBounds[i].Height) + parent.ItemSpacing.Height;
* }
* }
* }*/
// Set ideal height
idealSize.Height = 0;
for (var c = 0; c < parent.RepeatColumns; c++)
{
idealSize.Height = Math.Max(idealSize.Height, colPos[c].Y);
}
idealSize.Height = idealSize.Height - parent.ItemSpacing.Height + parent.Padding.Bottom;
}
// Set scroll height and autosize to ideal height
parent.AutoScrollMinSize = new Size(proposedSize.Width, idealSize.Height);
if (parentWidthPinned && parent.AutoSize)
{
parent.Size = idealSize;
}
System.Diagnostics.Debug.WriteLine(" " + string.Join(" ", Array.ConvertAll(ItemBounds.ToArray(), r => $"({r})")));
}
return(parent.AutoSize);
}