public override ColorBgra Apply(ColorBgra color)
{
float colorAverage = color.GetAverageColorChannelValueF();
float scale = (colorAverage - BackAverage) / (ForeAverage - BackAverage);
byte alpha = Utility.ClampToByte(scale * 255);
return(color.NewAlpha(alpha));
}
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
bool handled = false;
int gWidth = ClientRectangle.Width - 1 - 2 * nubSize;
float pixeldelta = 1 / (float)gWidth;
int alphadelta = 4;
if ((keyData & Keys.Control) != Keys.None)
{
pixeldelta *= 10;
alphadelta *= 4;
}
Keys keyCode = Keys.KeyCode & keyData;
switch (keyCode)
{
case Keys.Left:
if (selectedIndex >= 0 && selectedIndex < gradient.Count)
{
selectedIndex = gradient.SetPosition(selectedIndex, (gradient.GetPosition(selectedIndex) - pixeldelta).Clamp(0, 1));
handled = true;
cmdkeydown = true;
Invalidate();
}
break;
case Keys.Right:
if (selectedIndex >= 0 && selectedIndex < gradient.Count)
{
selectedIndex = gradient.SetPosition(selectedIndex, (gradient.GetPosition(selectedIndex) + pixeldelta).Clamp(0, 1));
handled = true;
cmdkeydown = true;
Invalidate();
}
break;
case Keys.Apps:
Point pt = GetNubLocation(selectedIndex);
OnMouseClick(new MouseEventArgs(MouseButtons.Right, 0, pt.X, pt.Y, 0));
handled = true;
break;
case Keys.Tab:
handled = ProcessTabKey((keyData & Keys.Modifiers) == Keys.None);
break;
case Keys.OemMinus:
handled = ProcessTabKey(false);
break;
case Keys.Oemplus:
handled = ProcessTabKey(true);
break;
case Keys.Up:
if (selectedIndex >= 0 && selectedIndex < gradient.Count)
{
ColorBgra currentColor = gradient.GetColor(selectedIndex);
gradient.SetColor(selectedIndex, currentColor.NewAlpha((currentColor.A + alphadelta).ClampToByte()));
cmdkeydown = true;
handled = true;
Invalidate();
}
break;
case Keys.Down:
if (selectedIndex >= 0 && selectedIndex < gradient.Count)
{
ColorBgra currentColor = gradient.GetColor(selectedIndex);
gradient.SetColor(selectedIndex, currentColor.NewAlpha((currentColor.A - alphadelta).ClampToByte()));
handled = true;
cmdkeydown = true;
Invalidate();
}
break;
case Keys.Enter:
if (selectedIndex >= 0 && selectedIndex < gradient.Count)
{
pt = GetNubLocation(selectedIndex);
OnMouseDoubleClick(new MouseEventArgs(MouseButtons.Left, 0, pt.X, pt.Y, 0));
handled = true;
}
break;
}
if ((int)keyData <= 57 && (int)keyData >= 48)
{
ProcessNumberKeys(keyData);
handled = true;
}
return(handled || base.ProcessCmdKey(ref msg, keyData));
}
public override ColorBgra Apply(ColorBgra color)
{
ColorBgra newColor = Color;
return(newColor.NewAlpha(color.A));
}