// Performance bottleneck
internal protected virtual void UpdateStyle()
{
// styles shouldn't be modified when we are not sited.
if (this.IsSited == false)
{
return;
}
int level = this.Level;
Padding p = this._previousPadding;
Size preferredSize;
// This line consumes lot of memory
Graphics g = this.OwningNode._grid.GetGraphics();
preferredSize = this.GetPreferredSize(g, this.InheritedStyle, this.RowIndex, new Size(0, 0));
//preferredSize = new Size(20, 21);
Image image = this.OwningNode.Image;
if (image != null)
{
// calculate image size
_imageWidth = image.Width + 2;
_imageHeight = image.Height + 2;
}
else
{
_imageWidth = glyphWidth;
_imageHeight = 0;
}
// TODO: Make this cleaner
if (preferredSize.Height < _imageHeight)
{
int leftpad = p.Left + (level * INDENT_WIDTH) + _imageWidth + INDENT_MARGIN;
// Performance bottleneck changing padding takes lot of time
TreeGridView _grid = (TreeGridView)this.DataGridView;
if (_grid.paddings_list.IndexOfKey(leftpad) >= 0)
{
this.Style = _grid.paddings_list.Values[leftpad];
}
else
{
Padding npad = new Padding(leftpad,
p.Top + (_imageHeight / 2), p.Right, p.Bottom + (_imageHeight / 2));
this.Style.Padding = npad;
_grid.paddings_list.Add(leftpad, this.Style);
}
_imageHeightOffset = 2;// (_imageHeight - preferredSize.Height) / 2;
}
else
{
int leftpad = p.Left + (level * INDENT_WIDTH) + _imageWidth + INDENT_MARGIN;
Padding oldpad = this.Style.Padding;
// if ((oldpad.Left != npad.Left) || (oldpad.Top != npad.Top) || (oldpad.Right != npad.Right) || (oldpad.Bottom != npad.Bottom))
if (oldpad.Left != leftpad)
{
// Performance bottleneck changing padding takes lot of time
TreeGridView _grid = (TreeGridView)this.DataGridView;
if (_grid.paddings_list.IndexOfKey(leftpad) >= 0)
{
this.Style = _grid.paddings_list[leftpad];
}
else
{
Padding npad = new Padding(leftpad,
p.Top, p.Right, p.Bottom);
this.Style.Padding = npad;
_grid.paddings_list.Add(leftpad, this.Style);
}
}
}
calculatedLeftPadding = ((level - 1) * glyphWidth) + _imageWidth + INDENT_MARGIN;
}