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Move platform dependent code to its own class

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This commit is contained in:
Elias Projahn 2020-04-18 20:34:03 +02:00
parent 3471fcf78b
commit 448a0de6fa
2 changed files with 53 additions and 24 deletions
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50
lib/platform.dart Normal file
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@ -0,0 +1,50 @@
import 'package:flutter/services.dart';
/// Object representing a document in Storage Access Framework terms.
class Document {
/// Unique document ID given by the SAF.
final String id;
/// Name of the document (i.e. file name).
final String name;
/// Document ID of the parent document.
final String parent;
/// Whether this document represents a directory.
final bool isDirectory;
// Use Map<dynamic, dynamic> here, as we get casting errors otherwise. This
// won't be typesafe anyway.
Document.fromJson(Map<dynamic, dynamic> json)
: id = json['id'],
name = json['name'],
parent = json['parent'],
isDirectory = json['isDirectory'];
}
/// Collection of methods that are implemented platform dependent.
class Platform {
static const _platform = MethodChannel('de.johrpan.musicus/platform');
/// Get child documents.
///
/// [treeId] is the base URI as requested from the SAF.
/// [parentId] is the document ID of the parent. If this is null, the children
/// of the tree base will be returned.
static Future<List<Document>> getChildren(
String treeUri, String parentId) async {
final List<Map<dynamic, dynamic>> childrenJson =
await _platform.invokeListMethod(
'getChildren',
{
'treeUri': treeUri,
'parentId': parentId,
},
);
return childrenJson
.map((childJson) => Document.fromJson(childJson))
.toList();
}
}

27
lib/selectors/files.dart
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@ -1,20 +1,7 @@
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import '../backend.dart';
class Document {
final String id;
final String name;
final String parent;
final bool isDirectory;
Document.fromMap(Map<dynamic, dynamic> map)
: id = map['id'],
name = map['name'],
parent = map['parent'],
isDirectory = map['isDirectory'];
}
import '../platform.dart';
class FilesSelector extends StatefulWidget {
@override
@ -22,8 +9,6 @@ class FilesSelector extends StatefulWidget {
}
class _FilesSelectorState extends State<FilesSelector> {
static const platform = MethodChannel('de.johrpan.musicus/platform');
BackendState backend;
List<Document> history = [];
List<Document> children = [];
@ -120,15 +105,9 @@ class _FilesSelectorState extends State<FilesSelector> {
children = [];
});
final childrenMaps = await platform.invokeListMethod<Map<dynamic, dynamic>>(
'getChildren',
{
'treeUri': backend.musicLibraryUri,
'parentId': history.isNotEmpty ? history.last.id : null,
},
);
final newChildren = await Platform.getChildren(
backend.musicLibraryUri, history.isNotEmpty ? history.last.id : null);
final newChildren = childrenMaps.map((m) => Document.fromMap(m)).toList();
newChildren.sort((d1, d2) {
if (d1.isDirectory != d2.isDirectory) {
return d1.isDirectory ? -1 : 1;