// Returns true if an AdditionalSnapLine can be found in a close surrounding of the given location.
private bool IsValidHit(IInputModeContext context, PointD location)
{
AdditionalSnapLineVisualCreator line = TryGetAdditionalSnapLineAt(location);
if (line != null)
{
handler = new AdditionalSnapLinePositionHandler(line, location);
return(true);
}
handler = null;
return(false);
}
/// <summary>
/// Creates a new handler for the given <paramref name="line">AdditionalSnapLine</paramref>.
/// </summary>
/// <param name="line">The additional snap line to move.</param>
/// <param name="mouseLocation">The mouse location at the beginning of a move gesture.</param>
public AdditionalSnapLinePositionHandler(AdditionalSnapLineVisualCreator line, PointD mouseLocation)
{
this.line = line;
mouseDeltaFromStart = mouseLocation - line.From;
}