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Add scroll direction to parallax effect (image and container) #30

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Add scroll direction to parallax effect (image and container) #30

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47 changes: 24 additions & 23 deletions lib/parallax.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -4,12 +4,11 @@ import 'package:transformer_page_view/transformer_page_view.dart';
typedef void PaintCallback(Canvas canvas, Size siz);

class ColorPainter extends CustomPainter {

final Paint _paint;
final TransformInfo info;
final List<Color> colors;

ColorPainter(this._paint,this.info,this.colors);
ColorPainter(this._paint, this.info, this.colors);

@override
void paint(Canvas canvas, Size size) {
Expand Down Expand Up @@ -69,23 +68,16 @@ class ColorPainter extends CustomPainter {
}
}




class _ParallaxColorState extends State<ParallaxColor>{

class _ParallaxColorState extends State<ParallaxColor> {
Paint paint = new Paint();


@override
Widget build(BuildContext context) {
return new CustomPaint(
painter: new ColorPainter(paint,widget.info,widget.colors),
painter: new ColorPainter(paint, widget.info, widget.colors),
child: widget.child,
);
}


}

class ParallaxColor extends StatefulWidget {
Expand All @@ -105,30 +97,34 @@ class ParallaxColor extends StatefulWidget {
State<StatefulWidget> createState() {
return new _ParallaxColorState();
}


}

class ParallaxContainer extends StatelessWidget {
final Widget child;
final double position;
final TransformInfo info;
final double translationFactor;
final double opacityFactor;

ParallaxContainer(
{@required this.child,
@required this.position,
this.translationFactor: 100.0,
this.opacityFactor: 1.0})
: assert(position != null),
@required this.info,
this.translationFactor: 100.0,
this.opacityFactor: 1.0})
: assert(info != null),
assert(translationFactor != null);

@override
Widget build(BuildContext context) {
return Opacity(
opacity: (1 - position.abs()).clamp(0.0, 1.0) * opacityFactor,
opacity: (1 - info.position.abs()).clamp(0.0, 1.0) * opacityFactor,
child: new Transform.translate(
offset: new Offset(position * translationFactor, 0.0),
offset: new Offset(
info.scrollDirection == Axis.horizontal
? info.position * translationFactor
: 0.0,
info.scrollDirection == Axis.vertical
? info.position * translationFactor
: 0.0),
child: child,
),
);
Expand All @@ -138,14 +134,19 @@ class ParallaxContainer extends StatelessWidget {
class ParallaxImage extends StatelessWidget {
final Image image;
final double imageFactor;
final TransformInfo info;

ParallaxImage.asset(String name, {double position, this.imageFactor: 0.3})
ParallaxImage.asset(String name, {@required this.info, this.imageFactor: 0.3})
: assert(imageFactor != null),
image = Image.asset(name,
fit: BoxFit.cover,
alignment: FractionalOffset(
0.5 + position * imageFactor,
0.5,
info.scrollDirection == Axis.horizontal
? 0.5 + info.position * imageFactor
: 0.5,
info.scrollDirection == Axis.vertical
? 0.5 + info.position * imageFactor
: 0.5,
));

@override
Expand Down