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// Tideland Go Library - Scroller
//
// Copyright (C) 2014-2017 Frank Mueller / Tideland / Oldenburg / Germany
//
// All rights reserved. Use of this source code is governed
// by the new BSD license.
package scroller
//--------------------
// IMPORTS
//--------------------
import (
"github.com/tideland/golib/errors"
)
//--------------------
// CONSTANTS
//--------------------
// Error codes of the scroller package.
const (
ErrNoSource = iota + 1
ErrNoTarget
ErrNegativeLines
)
var errorMessages = errors.Messages{
ErrNoSource: "cannot start scroller: no source",
ErrNoTarget: "cannot start scroller: no target",
ErrNegativeLines: "negative number of lines not allowed: %d",
}
//--------------------
// TESTING
//--------------------
// IsNoSourceError returns true, if the error signals that
// no source has been passed.
func IsNoSourceError(err error) bool {
return errors.IsError(err, ErrNoSource)
}
// IsNoTargetError returns true, if the error signals that
// no target has been passed.
func IsNoTargetError(err error) bool {
return errors.IsError(err, ErrNoTarget)
}
// IsNegativeLinesError returns true, if the error shows the
// setting of a negative number of lines to start with.
func IsNegativeLinesError(err error) bool {
return errors.IsError(err, ErrNegativeLines)
}
// EOF
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