/// <summary>
/// Set the columns to be displayed by the tree control
/// </summary>
/// <param name="columns"></param>
internal void SetColumns(TreeGridDesignerColumnDescriptor[] columns)
{
if (columns == null)
{
throw new ArgumentNullException("columns");
}
// the current column may now be out of range.
// reset to 0 if that is the case
if (CurrentColumn >= columns.Length)
{
CurrentColumn = 0;
}
_currentColumns = columns;
// do initial percentage calculations.
var percentages = new float[columns.Length];
var calculatedPercentage = 1.0F;
var calculatedColumns = columns.Length;
for (var i = 0; i < columns.Length; i++)
{
var columnPercentage = columns[i].InitialPercentage;
if (columnPercentage != TreeGridDesignerColumnDescriptor.CalculatePercentage)
{
if (columnPercentage > calculatedPercentage)
{
percentages[i] = -1;
continue; // using the initial percentage specified by this column would cause all
// percentages to sum to more than 1, so we discard it.
}
calculatedPercentage -= columnPercentage;
calculatedColumns--;
percentages[i] = columnPercentage;
}
else
{
percentages[i] = -1;
}
}
// calculate percentage increment used for columns in which the percentage
// is not specified explicitly
var defaultPercentageIncr = calculatedColumns == 0 ? 0 : calculatedPercentage / calculatedColumns;
// create headers
var headers = new VirtualTreeColumnHeader[columns.Length];
float percentage = 0;
for (var i = 0; i < headers.Length - 1; ++i)
{
if (percentages[i] == -1)
{
percentage += defaultPercentageIncr;
}
else
{
percentage += percentages[i];
}
if (columns[i].ColumnIsCheckBox)
{
headers[i] = new VirtualTreeColumnHeader(columns[i].Name, percentage, StateImageList.ImageSize.Width);
}
else
{
headers[i] = new VirtualTreeColumnHeader(columns[i].Name, percentage);
}
}
headers[headers.Length - 1] = new VirtualTreeColumnHeader(columns[headers.Length - 1].Name, 1f);
SetColumnHeaders(headers, false);
}
/// <summary>
/// Set the columns to be displayed by the tree control
/// </summary>
/// <param name="columns"></param>
internal void SetColumns(TreeGridDesignerColumnDescriptor[] columns)
{
if (columns == null)
{
throw new ArgumentNullException("columns");
}
// the current column may now be out of range.
// reset to 0 if that is the case
if (CurrentColumn >= columns.Length)
{
CurrentColumn = 0;
}
_currentColumns = columns;
// do initial percentage calculations.
var percentages = new float[columns.Length];
var calculatedPercentage = 1.0F;
var calculatedColumns = columns.Length;
for (var i = 0; i < columns.Length; i++)
{
var columnPercentage = columns[i].InitialPercentage;
if (columnPercentage != TreeGridDesignerColumnDescriptor.CalculatePercentage)
{
if (columnPercentage > calculatedPercentage)
{
percentages[i] = -1;
continue; // using the initial percentage specified by this column would cause all
// percentages to sum to more than 1, so we discard it.
}
calculatedPercentage -= columnPercentage;
calculatedColumns--;
percentages[i] = columnPercentage;
}
else
{
percentages[i] = -1;
}
}
// calculate percentage increment used for columns in which the percentage
// is not specified explicitly
var defaultPercentageIncr = calculatedColumns == 0 ? 0 : calculatedPercentage / calculatedColumns;
// create headers
var headers = new VirtualTreeColumnHeader[columns.Length];
float percentage = 0;
for (var i = 0; i < headers.Length - 1; ++i)
{
if (percentages[i] == -1)
{
percentage += defaultPercentageIncr;
}
else
{
percentage += percentages[i];
}
if (columns[i].ColumnIsCheckBox)
{
headers[i] = new VirtualTreeColumnHeader(columns[i].Name, percentage, StateImageList.ImageSize.Width);
}
else
{
headers[i] = new VirtualTreeColumnHeader(columns[i].Name, percentage);
}
}
headers[headers.Length - 1] = new VirtualTreeColumnHeader(columns[headers.Length - 1].Name, 1f);
SetColumnHeaders(headers, false);
}
/// <summary>
/// Update the appearance fields (string, glyph, and style) to the new header settings. This
/// cannot be used to update the width or position of the header.
/// </summary>
/// <param name="columnHeader">The header with the current settings</param>
/// <param name="displayColumn">The display column to update</param>
public void UpdateItemAppearance(VirtualTreeColumnHeader columnHeader, int displayColumn)
{
if (IsHandleCreated)
{
var item = new NativeMethods.HDITEM();
SetAppearanceFields(ref columnHeader, ref item);
if (item.mask != 0)
{
NativeMethods.SendMessage(Handle, NativeMethods.HDM_SETITEMW, OrderToIndex(displayColumn), ref item);
}
}
}
private void SetAppearanceFields(ref VirtualTreeColumnHeader columnHeader, ref NativeMethods.HDITEM item)
{
var text = columnHeader.Text;
var style = columnHeader.Style;
var imageIndex = columnHeader.ImageIndex;
var usingFormat = false;
// Set the text
if (text != null
&& text.Length != 0)
{
item.pszText = text;
item.mask |= NativeMethods.HDITEM.Mask.HDI_TEXT;
item.fmt |= NativeMethods.HDITEM.Format.HDF_STRING;
usingFormat = true;
}
// Set the image
if (imageIndex >= 0
&& myAssociatedControl.HeaderImageList != null)
{
item.iImage = imageIndex;
item.mask |= NativeMethods.HDITEM.Mask.HDI_IMAGE;
item.fmt |= NativeMethods.HDITEM.Format.HDF_IMAGE;
usingFormat = true;
}
// Update style fields
if ((style & ~(VirtualTreeColumnHeaderStyles.DragDisabled | VirtualTreeColumnHeaderStyles.ColumnPositionLocked)) != 0)
{
usingFormat = true;
// Set the alignment
if (0 != (style & VirtualTreeColumnHeaderStyles.AlignCenter))
{
item.fmt |= NativeMethods.HDITEM.Format.HDF_CENTER;
}
else if (0 != (style & VirtualTreeColumnHeaderStyles.AlignRight))
{
item.fmt |= NativeMethods.HDITEM.Format.HDF_RIGHT;
}
// Set the image location
if (0 != (style & VirtualTreeColumnHeaderStyles.ImageOnRight))
{
item.fmt |= NativeMethods.HDITEM.Format.HDF_BITMAP_ON_RIGHT;
}
// Set the up or down arrows
if (0 != (style & VirtualTreeColumnHeaderStyles.DisplayUpArrow))
{
item.fmt |= NativeMethods.HDITEM.Format.HDF_SORTUP;
}
else if (0 != (style & VirtualTreeColumnHeaderStyles.DisplayDownArrow))
{
item.fmt |= NativeMethods.HDITEM.Format.HDF_SORTDOWN;
}
}
// Set owner draw
if (0 != (style & (VirtualTreeColumnHeaderStyles.OwnerDraw | VirtualTreeColumnHeaderStyles.OwnerDrawOverlay)))
{
usingFormat = true;
item.fmt |= NativeMethods.HDITEM.Format.HDF_OWNERDRAW;
}
if (usingFormat)
{
item.mask |= NativeMethods.HDITEM.Mask.HDI_FORMAT;
}
}
/// <summary>
/// Add an item to the control. Always adds in the last position.
/// </summary>
/// <param name="columnHeader">The header information</param>
/// <param name="itemWidth"></param>
public void AddItem(VirtualTreeColumnHeader columnHeader, int itemWidth)
{
var item = new NativeMethods.HDITEM();
item.cxy = itemWidth;
item.mask = NativeMethods.HDITEM.Mask.HDI_WIDTH;
SetAppearanceFields(ref columnHeader, ref item);
NativeMethods.SendMessage(Handle, NativeMethods.HDM_INSERTITEMW, int.MaxValue, ref item);
}
