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Base Logging V2 behaviour (flutter#7820)
Implement the main interaction for the logging experience.
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| @@ -1,3 +1,3 @@ | ||
| { | ||
| "dart.showTodos": false, | ||
| "dart.showTodos": false | ||
| } |
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120 changes: 120 additions & 0 deletions
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packages/devtools_app/lib/src/screens/logging/logging_screen_v2/logging_model.dart
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| // Copyright 2024 The Chromium Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| import 'dart:async'; | ||
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| import 'package:flutter/foundation.dart'; | ||
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| import '../../../shared/utils.dart'; | ||
| import 'logging_controller_v2.dart'; | ||
| import 'logging_table_row.dart'; | ||
| import 'logging_table_v2.dart'; | ||
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| /// A class for holding state and state changes relevant to [LoggingControllerV2] | ||
| /// and [LoggingTableV2]. | ||
| /// | ||
| /// The [LoggingTableV2] table uses variable height rows. This model caches the | ||
| /// relevant heights and offsets so that the row heights only need to be calculated | ||
| /// once per parent width. | ||
| class LoggingTableModel extends ChangeNotifier { | ||
| LoggingTableModel() { | ||
| _worker = InterruptableChunkWorker( | ||
| callback: (index) => getFilteredLogHeight( | ||
| index, | ||
| ), | ||
| progressCallback: (progress) => _cacheLoadProgress.value = progress, | ||
| ); | ||
| } | ||
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| final _logs = <LogDataV2>[]; | ||
| final _filteredLogs = <LogDataV2>[]; | ||
| final _selectedLogs = <int>{}; | ||
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| final cachedHeights = <int, double>{}; | ||
| final cachedOffets = <int, double>{}; | ||
| late final InterruptableChunkWorker _worker; | ||
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| /// Represents the state of reloading the height caches. | ||
| /// | ||
| /// When null, then the cache is not loading. | ||
| /// When double, then the value is represents how much progress has been made. | ||
| ValueListenable<double?> get cacheLoadProgress => _cacheLoadProgress; | ||
| final _cacheLoadProgress = ValueNotifier<double?>(null); | ||
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| @override | ||
| void dispose() { | ||
| super.dispose(); | ||
| _cacheLoadProgress.dispose(); | ||
| } | ||
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| /// Update the width of the table. | ||
| /// | ||
| /// If different from the last width, this will flush all of the calculated heights, and recalculate their heights | ||
| /// in the background. | ||
| set tableWidth(double width) { | ||
| if (width != _tableWidth) { | ||
| _tableWidth = width; | ||
| cachedHeights.clear(); | ||
| cachedOffets.clear(); | ||
| unawaited(_preFetchRowHeights()); | ||
| } | ||
| } | ||
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| /// Get the filtered log at [index]. | ||
| LogDataV2 filteredLogAt(int index) => _filteredLogs[index]; | ||
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| double _tableWidth = 0.0; | ||
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| /// The total number of logs being held by the [LoggingTableModel]. | ||
| int get logCount => _logs.length; | ||
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| /// The number of filtered logs. | ||
| int get filteredLogCount => _filteredLogs.length; | ||
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| /// The number of selected logs. | ||
| int get selectedLogCount => _selectedLogs.length; | ||
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| /// Add a log to the list of tracked logs. | ||
| void add(LogDataV2 log) { | ||
| // TODO(danchevalier): ensure that search and filter lists are updated here. | ||
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| _logs.add(log); | ||
| _filteredLogs.add(log); | ||
| getFilteredLogHeight( | ||
| _logs.length - 1, | ||
| ); | ||
| notifyListeners(); | ||
| } | ||
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| /// Clears all of the logs from the model. | ||
| void clear() { | ||
| _logs.clear(); | ||
| _filteredLogs.clear(); | ||
| notifyListeners(); | ||
| } | ||
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| /// Get the offset of a filtered log, at [index], from the top of the list of filtered logs. | ||
| double filteredLogOffsetAt(int _) { | ||
| throw Exception('Implement this when needed'); | ||
| } | ||
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| /// Get the height of a filtered Log at [index]. | ||
| double getFilteredLogHeight(int index) { | ||
| final cachedHeight = cachedHeights[index]; | ||
| if (cachedHeight != null) return cachedHeight; | ||
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| return cachedHeights[index] = LoggingTableRow.calculateRowHeight( | ||
| _logs[index], | ||
| _tableWidth, | ||
| ); | ||
| } | ||
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| Future<bool> _preFetchRowHeights() async { | ||
| final didComplete = await _worker.doWork(_logs.length); | ||
| if (didComplete) { | ||
| _cacheLoadProgress.value = null; | ||
| } | ||
| return didComplete; | ||
| } | ||
| } |
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