public void AutoResizeColumns()
{
if (Items.Count == 0 || !Created)
{
return;
}
var itemHeight = Items[0].Bounds.Height;
var total = 0;
var totalWidths = 0.0f;
for (int i = 0; i < Columns.Count; i++)
{
var header = Columns[i] as ColumnHeader;
if (columnDescs[i].Width == 0.0f)
{
header.Width = itemHeight;
total += header.Width;
}
totalWidths += columnDescs[i].Width;
}
Debug.Assert(Utils.IsNearlyEqual(totalWidths, 1.0f));
var remaining = ClientRectangle.Width - total;
for (int i = 0; i < Columns.Count; i++)
{
var header = Columns[i] as ColumnHeader;
if (columnDescs[i].Width != 0.0f)
{
header.Width = (int)Math.Floor(remaining * columnDescs[i].Width);
}
}
}
void UpdateColumnWidths(TreeView treeView)
{
var propIdx = GetPropertyIndex(treeView.Parent);
var prop = properties[propIdx];
var columnDescs = prop.columns;
var itemHeight = treeView.GetCellArea(new TreePath(new[] { 0 }), treeView.Columns[0]).Height;
var total = 0;
var totalWidths = 0.0f;
for (int i = 0; i < treeView.Columns.Length; i++)
{
var column = treeView.Columns[i];
// Leave the last column as autosize to avoid going larger than the allocation.
column.Sizing = i == treeView.Columns.Length - 1 ? TreeViewColumnSizing.Autosize : TreeViewColumnSizing.Fixed;
if (columnDescs[i].Width == 0.0f)
{
// Dont update width if not needed, this can make the "SizeAllocated"
// event go in an infinite loop.
if (column.FixedWidth != itemHeight)
{
column.FixedWidth = itemHeight;
}
total += treeView.Columns[i].FixedWidth;
}
totalWidths += columnDescs[i].Width;
}
Debug.Assert(Utils.IsNearlyEqual(totalWidths, 1.0f));
var remaining = treeView.Allocation.Width - total;
for (int i = 0; i < treeView.Columns.Length - 1; i++)
{
if (columnDescs[i].Width != 0.0f)
{
var column = treeView.Columns[i];
var newWidth = (int)Math.Floor(remaining * columnDescs[i].Width);
// Dont update width if not needed, this can make the "SizeAllocated"
// event go in an infinite loop.
if (column.Width != newWidth)
{
column.FixedWidth = newWidth;
}
}
}
treeView.QueueDraw();
}
