NishantDesai1306

// register that SearchBar will need these callbacks
SearchBar({
  Key key,
  @required this.onCancelSearch,
  @required this.onSearchQueryChanged,
}) : super(key: key);

final VoidCallback onCancelSearch;
final Function(String) onSearchQueryChanged;

NishantDesai1306

// add this method to default app bar class
// this will get executed when user pressed back arrow on search bar
cancelSearch() {
  // remove search bar from stack
  setState(() {
    isInSearchMode = false;
  });

  // change search value to ''
  onSearchQueryChange('');

NishantDesai1306

class SearchBar extends StatefulWidget implements PreferredSizeWidget {
  @override
  Size get preferredSize => Size.fromHeight(56.0);

  @override
  _SearchBarState createState() => _SearchBarState();
}

class _SearchBarState extends State<SearchBar> with SingleTickerProviderStateMixin {
  String searchQuery = '';

NishantDesai1306

bool isInSearchMode = false;

// inside initState register our status listener
_controller.addStatusListener(animationStatusListener);

// add this method to our DefaultAppBar widget
animationStatusListener(AnimationStatus animationStatus) {
  if (animationStatus == AnimationStatus.completed) {
    setState(() {
      isInSearchMode = true; 

NishantDesai1306

// add SingleTickerProviderStateMixin to our State widget
class _DefaultAppBarState extends State<DefaultAppBar> with SingleTickerProviderStateMixin {
}

// intialize animation and controller
AnimationController _controller;
Animation _animation;

@override
initState() {

NishantDesai1306

class MyPainter extends CustomPainter {
  final Offset center;
  final double radius, containerHeight;
  final BuildContext context;

  Color color;
  double statusBarHeight, screenWidth;

  MyPainter({this.context, this.containerHeight, this.center, this.radius}) {
    ThemeData theme = Theme.of(context);

NishantDesai1306

double rippleStartX, rippleStartY;

void onSearchTapUp(TapUpDetails details) {
  setState(() {
    rippleStartX = details.globalPosition.dx;
    rippleStartY = details.globalPosition.dy;
  });

  print("pointer location $rippleStartX, $rippleStartY");
}

NishantDesai1306

class DefaultAppBar extends StatefulWidget implements PreferredSizeWidget {
  @override
  Size get preferredSize => Size.fromHeight(56.0);

  @override
  _DefaultAppBarState createState() => _DefaultAppBarState();
}

class _DefaultAppBarState extends State<DefaultAppBar> {
  @override

NishantDesai1306

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override