Skip to content

onAttach / onDetach added to ItemScrollController ScrollOffsetController #549

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

onAttach / onDetach added to ItemScrollController ScrollOffsetController #549

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
50 changes: 50 additions & 0 deletions packages/scrollable_positioned_list/lib/src/scrollable_positioned_list.dart
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -260,13 +260,38 @@ class ItemScrollController {
);
}

final List<VoidCallback> _onAttachListeners = [];
final List<VoidCallback> _onDetachListeners = [];

void addOnAttachListener(VoidCallback listener) {
_onAttachListeners.add(listener);
}

void removeOnAttachListener(VoidCallback listener) {
_onAttachListeners.remove(listener);
}

void addOnDetachListener(VoidCallback listener) {
_onDetachListeners.add(listener);
}

void removeOnDetachListener(VoidCallback listener) {
_onDetachListeners.remove(listener);
}

void _attach(_ScrollablePositionedListState scrollableListState) {
assert(_scrollableListState == null);
_scrollableListState = scrollableListState;
for (var listener in _onAttachListeners) {
listener();
}
}

void _detach() {
_scrollableListState = null;
for (var listener in _onDetachListeners) {
listener();
}
}
}

Expand All @@ -293,15 +318,40 @@ class ScrollOffsetController {
);
}

final List<VoidCallback> _onAttachListeners = [];
final List<VoidCallback> _onDetachListeners = [];

void addOnAttachListener(VoidCallback listener) {
_onAttachListeners.add(listener);
}

void removeOnAttachListener(VoidCallback listener) {
_onAttachListeners.remove(listener);
}

void addOnDetachListener(VoidCallback listener) {
_onDetachListeners.add(listener);
}

void removeOnDetachListener(VoidCallback listener) {
_onDetachListeners.remove(listener);
}

_ScrollablePositionedListState? _scrollableListState;

void _attach(_ScrollablePositionedListState scrollableListState) {
assert(_scrollableListState == null);
_scrollableListState = scrollableListState;
for (var listener in _onAttachListeners) {
listener();
}
}

void _detach() {
_scrollableListState = null;
for (var listener in _onDetachListeners) {
listener();
}
}
}

Expand Down