bosskmk / pluto_filtered_list Goto Github PK

A List where filters can be applied to the List and elements can be accessed or modified in that state.

Check out how to install from the official distribution site.

Report any questions or errors.

• Not implemented yet.
  • removeRange, fillRange, replaceRange.

var list = FilteredList(initialList: [1, 2, 3, 4, 5]);

• insert : If the filter is applied, the index at which the element is added is adjusted.

  list.setFilter((e) => e > 3); // [4, 5]
  list.insert(0, 35); // [35, 4, 5]
  
  list.setFilter(null); // [1, 2, 3, 35, 4, 5]
  list.insert(0, -1); // [-1, 1, 2, 3, 35, 4, 5]

• removeAt : If the filter is applied, the index at which the element is removed is adjusted.

  list.setFilter((e) => e > 3); // [4, 5]
  list.removeAt(0); // [5]
  
  list.setFilter(null); // [1, 2, 3, 5]
  list.removeAt(0); // [2, 3, 5]

• insertAll : If the filter is applied, the index at which the element is added is adjusted.

  list.setFilter((e) => e > 3); // [4, 5]
  list.insertAll(0, [35, 36, 37]); // [35, 36, 37, 4, 5]
  
  list.setFilter(null); // [1, 2, 3, 35, 36, 37, 4, 5]
  list.insertAll(0, [-1, -2, -3]); // [-1, -2, -3, 1, 2, 3, 35, 36, 37, 4, 5]

• remove : If the filter has been applied, the element is removed from the range where the filter is applied.

  list.setFilter((e) => e > 3); // [4, 5]
  var removedThree = list.remove(3); // false
  var removedFour = list.remove(4); // true
  
  list.setFilter(null); // [1, 2, 3, 5]
  var removedThreeAgain = list.remove(3); // true

• removeFromOriginal : Removes elements across the entire scope regardless of filter application.

  list.setFilter((e) => e > 3); // [4, 5]
  var removedThree = list.removeFromOriginal(3); // true
  var removedFour = list.removeFromOriginal(4); // true
  
  list.setFilter(null); // [1, 2, 5]
  var removedThreeAgain = list.removeFromOriginal(3); // false

• removeWhere : If the filter has been applied, the element is removed from the range where the filter is applied.
• removeWhereFromOriginal : Removes elements across the entire scope regardless of filter application.
• retainWhere : If the filter has been applied, the element is retained from the range where the filter is applied.
• retainWhereFromOriginal : Retains elements across the entire scope regardless of filter application.
• clear : If the filter has been applied, the element is cleared from the range where the filter is applied.
• clearFromOriginal : Clears elements across the entire scope.
• removeLast : The last element is deleted while the filter is applied.
• removeLastFromOriginal : Delete the last element from the entire list.
• shuffle : Shuffles elements across the entire scope.

/// Create an empty list.
var filteredList = FilteredList<String>();

/// Contains the methods of List.
/// add, remove, clear, where, ...
filteredList.add('one');

print(filteredList); // ['one']

filteredList.addAll(['two', 'three', 'four', 'five']);

print(filteredList); // ['one', 'two', 'three', 'four', 'five']

/// Set the filter.
/// Implement a callback function that returns a bool type.
/// The example filters a string of length 4, as shown below.
filteredList.setFilter((element) => element.length == 4); // ['four', 'five']

/// Only elements of length 4 in the list were filtered out,
/// resulting in the length of the list being 2.
print(filteredList.length); // 2

print(filteredList[0]); // 'four'

print(filteredList[1]); // 'five'

/// You can turn off the filter by passing null to setFilter.
filteredList.setFilter(null); // ['one', 'two', 'three', 'four', 'five']

/// The filter is cleared, so the length of the original list is 5.
print(filteredList.length); // 5

print(filteredList[0]); // 'one'

print(filteredList[1]); // 'two'

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