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Feature: callback to cancel toggle #77

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merged 2 commits into from Apr 23, 2023
Merged

Feature: callback to cancel toggle #77

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5ed3fa6
add callback to cancel toggle
joelpaulkoch Mar 23, 2023
3d10ab1
Merge branch 'master' into master
PramodJoshi Apr 23, 2023
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32 changes: 18 additions & 14 deletions lib/toggle_switch.dart
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Expand Up @@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
import 'dart:math';

typedef OnToggle = void Function(int? index);
typedef CancelToggle = Future<bool> Function(int? index);

// ignore: must_be_immutable
class ToggleSwitch extends StatefulWidget {
Expand Down Expand Up @@ -73,6 +74,9 @@ class ToggleSwitch extends StatefulWidget {
/// OnToggle function
final OnToggle? onToggle;

/// CancelToggle function
final CancelToggle? cancelToggle;

/// Change selection on tap
final bool changeOnTap;

Expand Down Expand Up @@ -121,6 +125,7 @@ class ToggleSwitch extends StatefulWidget {
this.inactiveBgColor,
this.inactiveFgColor,
this.onToggle,
this.cancelToggle,
this.cornerRadius = 8.0,
this.initialLabelIndex = 0,
this.minWidth = 72.0,
Expand Down Expand Up @@ -462,22 +467,21 @@ class _ToggleSwitchState extends State<ToggleSwitch>

/// Handles selection
void _handleOnTap(int index) async {
bool notifyNull = false;
if (widget.changeOnTap) {
if (widget.doubleTapDisable && widget.initialLabelIndex == index) {
setState(() => widget.initialLabelIndex = null);
notifyNull = true;
} else {
setState(() => widget.initialLabelIndex = index);
}
int? newIndex = index;
if (widget.doubleTapDisable && widget.initialLabelIndex == index){
newIndex = null;
}
if (widget.onToggle != null) {
if (notifyNull) {
widget.onToggle!(null);
} else {
widget.onToggle!(index);
}

final cancel = await widget.cancelToggle?.call(newIndex) ?? false;
if(cancel){
return;
}

if (widget.changeOnTap) {
setState(() => widget.initialLabelIndex = newIndex);
}

widget.onToggle?.call(newIndex);
}

/// Calculates width to prevent overflow by taking screen width into account.
Expand Down