Flutter 如何在Dart 2-颤振中限制TextEditingController侦听器事件
我想知道是否有一些内置的功能,我可能会错过。我试图找到类似的东西,但我找到的唯一一个包()不再支持Dart 2 这是我想控制的部分代码Flutter 如何在Dart 2-颤振中限制TextEditingController侦听器事件,flutter,dart-2,Flutter,Dart 2,我想知道是否有一些内置的功能,我可能会错过。我试图找到类似的东西,但我找到的唯一一个包()不再支持Dart 2 这是我想控制的部分代码 final TextEditingController _filter = new TextEditingController(); String _searchText = ""; _filter.addListener(() { if (_filter.text.isEmpty) { setState(() {
final TextEditingController _filter = new TextEditingController();
String _searchText = "";
_filter.addListener(() {
if (_filter.text.isEmpty) {
setState(() {
_searchText = "";
});
} else {
setState(() {
_searchText = _filter.text;
});
}
//This action is being fired TOO many times :(
widget.onUpdateSearchTerm(_searchText);
});
有什么想法吗?我会使用
rxdart
在rxdart 0.22.x上使用Observable
final TextEditingController _filter = new TextEditingController();
String _searchText = "";
final _textUpdates = StreamController<String>();
_filter.addListener(() => _textUpdates.add(_filter.text));
Observable(_textUpdates.stream)
.throttle(const Duration(milliseconds: 700))
.forEach((s) {
if (s.isEmpty) {
setState(() {
_searchText = "";
});
} else {
setState(() {
_searchText = s;
});
}
//This action is being fired TOO many times :(
widget.onUpdateSearchTerm(_searchText);
});
final TextEditingController_filter=new TextEditingController();
字符串_searchText=“”;
最终_textUpdates=StreamController();
_filter.addListener(()=>_textUpdates.add(_filter.text));
可观察(_textUpdates.stream)
.节气门(恒定持续时间(毫秒:700))
.forEach(s){
如果(s.isEmpty){
设置状态(){
_searchText=“”;
});
}否则{
设置状态(){
_searchText=s;
});
}
//此操作被激发的次数太多:(
onUpdateSearchTerm(_searchText);
});
rxdart 0.23.x及以后版本
final TextEditingController _filter = new TextEditingController();
String _searchText = "";
final _textUpdates = StreamController<String>();
_filter.addListener(() => _textUpdates.add(_filter.text));
_textUpdates.stream
.throttle(const Duration(milliseconds: 700))
.forEach((s) {
if (s.isEmpty) {
setState(() {
_searchText = "";
});
} else {
setState(() {
_searchText = s;
});
}
//This action is being fired TOO many times :(
widget.onUpdateSearchTerm(_searchText);
});
final TextEditingController_filter=new TextEditingController();
字符串_searchText=“”;
最终_textUpdates=StreamController();
_filter.addListener(()=>_textUpdates.add(_filter.text));
_textUpdates.stream
.节气门(恒定持续时间(毫秒:700))
.forEach(s){
如果(s.isEmpty){
设置状态(){
_searchText=“”;
});
}否则{
设置状态(){
_searchText=s;
});
}
//此操作被激发的次数太多:(
onUpdateSearchTerm(_searchText);
});
另见