Widget _buildCustomColorSizePlaceholder() {
    return Container(
      width: 200,
      child: PlaceholderLines(
        count: 4,
        align: TextAlign.center,
        lineHeight: 8,
        color: Colors.blueAccent,
      ),
    );
  }

  Widget _buildSimpleTextPlaceholder(TextAlign align) {
    return Container(
      width: 300,
      child: PlaceholderLines(
        count: 3,
        align: align,
      ),
    );
  }

  Widget _buildSubtitle(String title) {
    return Container(
      padding: EdgeInsets.only(
        top: 24,
        bottom: 16,
      ),
      child: Text(
        title,
        style: TextStyle(fontSize: 20),
      ),
    );
  }

  _buildAnimated() {
    return Container(
      width: 300,
      child: PlaceholderLines(
        count: 3,
        animate: true,
        color: Colors.purple,
      ),
    );
  }

  _buildCardExample() {
    return Material(
      borderRadius: BorderRadius.circular(10),
      elevation: 9,
      child: Container(
        padding: EdgeInsets.symmetric(vertical: 16, horizontal: 20),
        width: 300,
        child: Row(
          children: <Widget>[
            Container(
              margin: EdgeInsets.only(right: 16),
              width: 70,
              height: 70,
              decoration: BoxDecoration(color: Colors.grey.withOpacity(.6), ),
              child: Center(child: Icon(Icons.photo_size_select_actual, color: Colors.white, size: 38,),),
            ),
            Expanded(
              child: PlaceholderLines(
                count: 3,
              ),
            ),
          ],
        ),
      ),
    );
  }

/// Defines how many lines to build
final int count;

/// Defines `color` to be used as base when building each line
final Color color;

/// Defines `alignment` for all the lines generated
final TextAlign align;

/// Defines the `min` value for the `opacity` that a line could have, since color opacity it's generated randomly ,
/// this prevents the value from going to low (making it invisible)
/// defaults to [0.4]
final double minOpacity;

/// Defines the `max` value for the `opacity` that a line could have, since color opacity it's generated randomly ,
/// defaults to [0.94]
final double maxOpacity;

/// Defines the `max` `width` that a line could have, since `width` it's generated randomly
/// defaults to [.95]
final double maxWidth;

/// Defines the `min` `width` that a line could have, since `width` it's generated randomly
/// defaults to [.72]
final double minWidth;

/// Defines the line `height`
/// defaults to [12]
final double lineHeight;

/// if [true], plays a nice animation of an overlay
final bool animate;

/// Use a [customAnimationOverlay] to display instead of the difault one
final Widget customAnimationOverlay;

/// Set a custom [animationOverlayColor]
final Color animationOverlayColor;

/// If [true] , this will cause the lines to be rebuild with different widths (randomly generated)
/// every time any parent widget rebuilds it's state
/// defaults to [false]
final bool rebuildOnStateChange;