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onPageChange parameter added #25

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onPageChange parameter added #25

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6 changes: 2 additions & 4 deletions lib/src/builders/builder.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -37,8 +37,7 @@ class PageFlipBuilderState extends State<PageFlipBuilder> {
if (_boundaryKey.currentContext == null) return;
await Future.delayed(const Duration(milliseconds: 100));
if (mounted) {
final boundary = _boundaryKey.currentContext!.findRenderObject()!
as RenderRepaintBoundary;
final boundary = _boundaryKey.currentContext!.findRenderObject()! as RenderRepaintBoundary;
final image = await boundary.toImage();
setState(() {
imageData[index] = image.clone();
Expand Down Expand Up @@ -67,8 +66,7 @@ class PageFlipBuilderState extends State<PageFlipBuilder> {
(timeStamp) => _captureImage(timeStamp, currentPageIndex.value),
);
}
if (widget.pageIndex == currentPageIndex.value ||
(widget.pageIndex == (currentPageIndex.value + 1))) {
if (widget.pageIndex == currentPageIndex.value || (widget.pageIndex == (currentPageIndex.value + 1))) {
return ColoredBox(
color: widget.backgroundColor ?? Colors.black12,
child: RepaintBoundary(
Expand Down
14 changes: 14 additions & 0 deletions lib/src/page_flip_widget.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ class PageFlipWidget extends StatefulWidget {
this.initialIndex = 0,
this.lastPage,
this.isRightSwipe = false,
this.onPageChange,
}) : assert(initialIndex < children.length, 'initialIndex cannot be greater than children length'),
super(key: key);

Expand All @@ -27,6 +28,9 @@ class PageFlipWidget extends StatefulWidget {
final double cutoffPrevious;
final bool isRightSwipe;

/// If the last page is valid, when you enter the last page, the index value will be 1 more than the list length.
final Function(int index)? onPageChange;

@override
PageFlipWidgetState createState() => PageFlipWidgetState();
}
Expand Down Expand Up @@ -95,6 +99,16 @@ class PageFlipWidgetState extends State<PageFlipWidget> with TickerProviderState
currentWidget = ValueNotifier(pages[pageNumber]);
currentPageIndex = ValueNotifier(widget.initialIndex);
}
if (widget.onPageChange != null) {
widget.onPageChange!(currentPageIndex.value);
}
currentPageIndex.addListener(
() {
if (widget.onPageChange != null) {
widget.onPageChange!(currentPageIndex.value);
}
},
);
}

bool get _isLastPage => (pages.length - 1) == pageNumber;
Expand Down