/// <summary>
/// Creates a new instance of the <see cref="ColorCollection" /> class that contains elements loaded from the specified file.
/// </summary>
/// <param name="fileName">Name of the file to load.</param>
/// <exception cref="System.ArgumentNullException">Thrown if the <c>fileName</c> argument is not specified.</exception>
/// <exception cref="System.IO.FileNotFoundException">Thrown if the file specified by <c>fileName</c> cannot be found.</exception>
/// <exception cref="System.ArgumentException">Thrown if no <see cref="IPaletteSerializer"/> is available for the file specified by <c>fileName</c>.</exception>
public static ColorCollection LoadPalette(string fileName)
{
IPaletteSerializer serializer;
if (string.IsNullOrEmpty(fileName))
{
throw new ArgumentNullException(nameof(fileName));
}
if (!File.Exists(fileName))
{
throw new FileNotFoundException(string.Format("Cannot find file '{0}'", fileName), fileName);
}
serializer = PaletteSerializer.GetSerializer(fileName);
if (serializer == null)
{
throw new ArgumentException(string.Format("Cannot find a palette serializer for '{0}'", fileName), nameof(fileName));
}
using (FileStream file = File.OpenRead(fileName))
{
return(serializer.Deserialize(file));
}
}
private void loadPaletteButton_Click(object sender, EventArgs e)
{
using (FileDialog dialog = new OpenFileDialog
{
Filter = PaletteSerializer.DefaultOpenFilter,
DefaultExt = "pal",
Title = "Open Palette File"
})
{
if (dialog.ShowDialog(this) == DialogResult.OK)
{
try
{
IPaletteSerializer serializer;
serializer = PaletteSerializer.GetSerializer(dialog.FileName);
if (serializer != null)
{
ColorCollection palette;
if (!serializer.CanRead)
{
throw new InvalidOperationException("Serializer does not support reading palettes.");
}
using (FileStream file = File.OpenRead(dialog.FileName))
{
palette = serializer.Deserialize(file);
}
if (palette != null)
{
// we can only display 96 colors in the color grid due to it's size, so if there's more, bin them
while (palette.Count > 96)
{
palette.RemoveAt(palette.Count - 1);
}
// or if we have less, fill in the blanks
while (palette.Count < 96)
{
palette.Add(Color.White);
}
colorGrid.Colors = palette;
}
}
else
{
MessageBox.Show("Sorry, unable to open palette, the file format is not supported or is not recognized.", "Load Palette", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}
catch (Exception ex)
{
MessageBox.Show(string.Format("Sorry, unable to open palette. {0}", ex.GetBaseException().Message), "Load Palette", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
}