private string FmtHdr(int colIndex, int w)
{
ConsoleListBoxColumn <RowT> col = columns[colIndex];
if (colIndex == sortColIndex)
{
return(FormatExactWidth(
col.Header + " " + (sortDir == ListSortDirection.Ascending ? sortUp : sortDown),
w
));
}
else
{
return(FormatExactWidth(col.Header, w));
}
}
private Comparison <RowT> getComparer(ConsoleListBoxColumn <RowT> col, bool ascending)
{
if (ascending)
{
return(col.Comparer
?? ((a, b) => col.Renderer(a).Trim().CompareTo(col.Renderer(b).Trim())));
}
else if (col.Comparer != null)
{
return((a, b) => col.Comparer(b, a));
}
else
{
return((a, b) => col.Renderer(b).Trim().CompareTo(col.Renderer(a).Trim()));
}
}
/// <summary>
/// Draw the list box
/// </summary>
/// <param name="focused">Framework parameter not relevant to this object</param>
public override void Draw(bool focused)
{
int l = GetLeft(), r = GetRight(),
t = GetTop(), b = GetBottom(), h = b - t + 1;
bool needScrollbar = (sortedFilteredData.Count >= h);
int contentR = needScrollbar ? r - 1 : r;
// Prevent selection from running off the end of the list
if (selectedRow > sortedFilteredData.Count - 1)
{
selectedRow = sortedFilteredData.Count - 1;
}
// Ensure selection is not before the top of the list
if (selectedRow < 0)
{
selectedRow = 0;
}
// Don't scroll past the bottom of the list
if (topRow > sortedFilteredData.Count - h + 1)
{
topRow = sortedFilteredData.Count - h + 1;
}
// Don't scroll before the top of the list
if (topRow < 0)
{
topRow = 0;
}
if (topRow > selectedRow)
{
// Scroll up to reveal selected row
topRow = selectedRow;
}
else if (topRow < selectedRow - h + 2)
{
// Scroll down to reveal selected row
topRow = selectedRow - h + 2;
}
for (int y = 0, index = topRow - 1; y < h; ++y, ++index)
{
Console.SetCursorPosition(l, t + y);
if (y == 0)
{
Console.BackgroundColor = ConsoleTheme.Current.ListBoxHeaderBg;
Console.ForegroundColor = ConsoleTheme.Current.ListBoxHeaderFg;
Console.Write(" ");
for (int i = 0; i < columns.Count; ++i)
{
ConsoleListBoxColumn <RowT> col = columns[i];
if (i > 0)
{
Console.Write(" ");
}
// Truncate to designated size of the ListBox
int maxW = r - Console.CursorLeft + 1;
if (maxW > 0)
{
Console.Write(FmtHdr(
i,
col.Width < maxW ? col.Width : maxW
));
}
}
}
else if (index >= 0 && index < sortedFilteredData.Count)
{
if (topRow + y - 1 == selectedRow)
{
Console.BackgroundColor = ConsoleTheme.Current.ListBoxSelectedBg;
Console.ForegroundColor = ConsoleTheme.Current.ListBoxSelectedFg;
}
else
{
Console.BackgroundColor = ConsoleTheme.Current.ListBoxUnselectedBg;
Console.ForegroundColor = ConsoleTheme.Current.ListBoxUnselectedFg;
}
Console.Write(" ");
for (int i = 0; i < columns.Count; ++i)
{
ConsoleListBoxColumn <RowT> col = columns[i];
if (i > 0)
{
Console.Write(" ");
}
// Truncate to designated size of the ListBox
int maxW = contentR - Console.CursorLeft + 1;
if (maxW > 0)
{
Console.Write(FormatExactWidth(
col.Renderer(sortedFilteredData[index]).Trim(),
col.Width < maxW ? col.Width : maxW
));
}
}
}
else
{
Console.BackgroundColor = ConsoleTheme.Current.ListBoxUnselectedBg;
Console.ForegroundColor = ConsoleTheme.Current.ListBoxUnselectedFg;
}
try {
if (y == 0)
{
Console.Write("".PadRight(r - Console.CursorLeft + 1));
}
else
{
// Make space for scrollbar for anti-flicker
Console.Write("".PadRight(contentR - Console.CursorLeft + 1));
}
} catch { }
}
// Now draw the scrollbar
if (needScrollbar)
{
DrawScrollbar(
r, t + scrollTop, b,
sortedFilteredData.Count > 0
? t + 1 + scrollTop + (h - 2 - scrollTop) * selectedRow / sortedFilteredData.Count
: -1
);
}
}
