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79 lines
3.4 KiB
79 lines
3.4 KiB
// Copyright 2018 the Charts project authors. Please see the AUTHORS file
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// for details.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import 'package:charts_common/common.dart' as common
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show ImmutableSeries, SelectionModel, SelectionModelType, SeriesDatumConfig;
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/// Contains override settings for the internal chart state.
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///
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/// The chart will check non null settings and apply them if they differ from
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/// the internal chart state and trigger the appropriate level of redrawing.
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class UserManagedState<D> {
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/// The expected selection(s) on the chart.
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///
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/// If this is set and the model for the selection model type differs from
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/// what is in the internal chart state, the selection will be applied and
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/// repainting will occur such that behaviors that draw differently on
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/// selection change can update, such as the line point highlighter.
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///
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/// If more than one type of selection model is used, only the one(s)
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/// specified in this list will override what is kept in the internally.
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///
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/// To clear the selection, add an empty selection model.
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final selectionModels =
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<common.SelectionModelType, UserManagedSelectionModel<D>>{};
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}
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/// Container for the user managed selection model.
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///
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/// This container is needed because the selection model generated by selection
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/// events is a [SelectionModel], while any user defined selection has to be
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/// specified by passing in [selectedSeriesConfig] and [selectedDataConfig].
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/// The configuration is converted to a selection model after the series data
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/// has been processed.
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class UserManagedSelectionModel<D> {
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final List<String> selectedSeriesConfig;
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final List<common.SeriesDatumConfig> selectedDataConfig;
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common.SelectionModel<D> _model;
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/// Creates a [UserManagedSelectionModel] that holds [SelectionModel].
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///
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/// [selectedSeriesConfig] and [selectedDataConfig] is set to null because the
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/// [_model] is returned when [getModel] is called.
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UserManagedSelectionModel({common.SelectionModel<D> model})
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: _model = model ?? new common.SelectionModel(),
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selectedSeriesConfig = null,
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selectedDataConfig = null;
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/// Creates a [UserManagedSelectionModel] with configuration that is converted
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/// to a [SelectionModel] when [getModel] provides a processed series list.
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UserManagedSelectionModel.fromConfig(
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{List<String> selectedSeriesConfig,
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List<common.SeriesDatumConfig> selectedDataConfig})
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: this.selectedSeriesConfig = selectedSeriesConfig ?? <String>[],
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this.selectedDataConfig =
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selectedDataConfig ?? <common.SeriesDatumConfig>[];
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/// Gets the selection model. If the model is null, create one from
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/// configuration and the processed [seriesList] passed in.
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common.SelectionModel<D> getModel(
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List<common.ImmutableSeries<D>> seriesList) {
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_model ??= new common.SelectionModel.fromConfig(
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selectedDataConfig, selectedSeriesConfig, seriesList);
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return _model;
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}
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}
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