/// <summary>
/// add color to list
/// </summary>
/// <param name="c">new color value</param>
public void Add(Color c)
{
if (c.IsEmpty)
return;
if (c.A == 0)
return;
if (c.A != 255)
{
c = Color.FromArgb(255, c);
}
if (_bolCheckValueExistWhenAdd)
{
if (IndexOf(c) < 0)
{
_myItems.Add(c);
}
}
else
{
_myItems.Add(c);
}
}
/// <summary>
/// get color index
/// </summary>
/// <param name="c">color</param>
/// <returns>index , if not found , return -1</returns>
public int IndexOf(Color c)
{
if (c.A == 0)
{
return -1;
}
if (c.A != 255)
{
c = Color.FromArgb(255, c);
}
for (var iCount = 0; iCount < _myItems.Count; iCount++)
{
var color = _myItems[iCount];
if (color.ToArgb() == c.ToArgb())
{
return iCount;
}
}
return -1;
}
/// <summary>
/// delete special color
/// </summary>
/// <param name="c">color value</param>
public void Remove(Color c)
{
var index = IndexOf(c);
if (index >= 0)
_myItems.RemoveAt(index);
}
/// <summary>
/// get color at special index , if index out of range , return default color
/// </summary>
/// <param name="index">index</param>
/// <param name="defaultValue">default value</param>
/// <returns>color value</returns>
public Color GetColor(int index, Color defaultValue)
{
index --;
if (index >= 0 && index < _myItems.Count)
{
return _myItems[index];
}
return defaultValue;
}