private static void UndoCommand_Executed(object sender, ExecutedRoutedEventArgs e)
{
// Use simple reverse-or-redo Undo (like Notepad).
ColorPickerUserControl colorPicker = (ColorPickerUserControl)sender;
colorPicker.Color = (Color)colorPicker.previousColor;
}
private static void OnColorChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
ColorPickerUserControl colorPicker = (ColorPickerUserControl)sender;
Color oldColor = (Color)e.OldValue;
Color newColor = (Color)e.NewValue;
colorPicker.Red = newColor.R;
colorPicker.Green = newColor.G;
colorPicker.Blue = newColor.B;
colorPicker.previousColor = oldColor;
colorPicker.OnColorChanged(oldColor, newColor);
}
private static void OnColorRGBChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
ColorPickerUserControl colorPicker = (ColorPickerUserControl)sender;
Color color = colorPicker.Color;
if (e.Property == RedProperty)
{
color.R = (byte)e.NewValue;
}
else if (e.Property == GreenProperty)
{
color.G = (byte)e.NewValue;
}
else if (e.Property == BlueProperty)
{
color.B = (byte)e.NewValue;
}
colorPicker.Color = color;
}
private static void UndoCommand_CanExecute(object sender, CanExecuteRoutedEventArgs e)
{
ColorPickerUserControl colorPicker = (ColorPickerUserControl)sender;
e.CanExecute = colorPicker.previousColor.HasValue;
}