【发布时间】：2021-07-03 22:37:57
【问题描述】：
我真的在为这个问题苦苦挣扎，提出正确的问题，甚至是正确的术语，所以请在这里帮助我。在我不知道的正确问题语法下，这可能是一个简单的解决方法。如果是这样，我会在知道术语后删除。
目标
我想将数据动态添加到我的 Syncfusion DataGrid。
问题
- 我不知道如何将我的动态数据列表添加到我的 DataGridSource
- 由于类中没有上下文，无法使用 Provider、Consumer 等
- 在 Widget 中调用 DataGrid Consumer 中的类型时，不知道如何向类构造函数添加参数，我看不到任何可能的方式将参数传入 Consumer，因为 DataGris 源对获取的内容很挑剔
- 创建我的数据库类的实例并将数据注入 DataGrid 源根本不起作用，数据不加载
- 我可以看到最终这是一个状态管理问题，因此如果我在这里只学习一件事，我想学习如何将数据传递给一个独立于任何小部件的类，而无需标准的混乱 OOP 初始化
- 注意，我确实尝试使用代理提供程序来初始化数据库数据方法 - 没有用
如果我的问题没有意义，我可以尝试扩展。但是我想做的就是使用 Consumer 动态地将数据添加到 DataGrid。
这是我使用带有硬编码数据的消费者的 Syncfusions 编码示例。
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:syncfusion_flutter_datagrid/datagrid.dart';
class DataGridWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Consumer<EmployeeDataSource>(
builder: (context, employeeDataSource, _) {
return Scaffold(
appBar: AppBar(
title: Text('DataGrid Demo'),
),
body: SfDataGrid(
source: employeeDataSource,
columnWidthMode: ColumnWidthMode.fill,
selectionMode: SelectionMode.multiple,
navigationMode:
GridNavigationMode.cell, // controller: dataGridController,
onQueryRowHeight: (details) {
return details.rowHeight;
},
columns: <GridColumn>[
GridTextColumn(
columnName: 'id',
label: Container(
padding: EdgeInsets.all(16.0),
alignment: Alignment.centerRight,
child: Text(
'ID',
))),
GridTextColumn(
columnName: 'name',
label: Container(
padding: EdgeInsets.all(16.0),
alignment: Alignment.centerLeft,
child: Text('Name'))),
GridTextColumn(
columnName: 'designation',
width: 120,
label: Container(
padding: EdgeInsets.all(16.0),
alignment: Alignment.centerLeft,
child: Text('Designation'))),
GridTextColumn(
columnName: 'salary',
label: Container(
padding: EdgeInsets.all(16.0),
alignment: Alignment.centerRight,
child: Text('Salary'))),
],
),
);
},
);
}
}
/// Custom business object class which contains properties to hold the detailed
/// information about the employee which will be rendered in datagrid.
class Employee {
/// Creates the employee class with required details.
Employee(this.id, this.name, this.designation, this.salary);
/// Id of an employee.
int id;
/// Name of an employee.
String name;
/// Designation of an employee.
String designation;
/// Salary of an employee.
int salary;
}
class EmployeeDataSource extends DataGridSource {
EmployeeDataSource() {
employees = getEmployeeData();
buildDataGridRow();
}
void buildDataGridRow() {
dataGridRows = employees
.map<DataGridRow>((e) => DataGridRow(cells: [
DataGridCell<int>(columnName: 'id', value: e.id),
DataGridCell<String>(columnName: 'name', value: e.name),
DataGridCell<String>(
columnName: 'designation', value: e.designation),
DataGridCell<int>(columnName: 'salary', value: e.salary),
]))
.toList();
}
List<Employee> employees = <Employee>[];
List<DataGridRow> dataGridRows = [];
@override
List<DataGridRow> get rows => dataGridRows;
@override
DataGridRowAdapter buildRow(DataGridRow row) {
return DataGridRowAdapter(
cells: row.getCells().map<Widget>((e) {
return Container(
alignment: (e.columnName == 'id' || e.columnName == 'salary')
? Alignment.centerRight
: Alignment.centerLeft,
padding: EdgeInsets.all(8.0),
child: Text(e.value.toString()),
);
}).toList());
}
List<Employee> getEmployeeData() {
return [
Employee(10001, 'James', 'Project Lead', 20000),
Employee(10002, 'Kathryn', 'Manager', 30000),
Employee(10003, 'Lara', 'Developer', 15000),
Employee(10004, 'Michael', 'Designer', 15000),
Employee(10005, 'Martin', 'Developer', 15000),
Employee(10006, 'Newberry', 'Developer', 15000),
Employee(10007, 'Balnc', 'Developer', 15000),
Employee(10008, 'Perry', 'Developer', 15000),
Employee(10009, 'Gable', 'Developer', 15000),
Employee(10010, 'Grimes', 'Developer', 15000),
Employee(10010, 'Lane', 'Project Lead', 20000),
Employee(10010, 'Doran', 'Developer', 15000),
Employee(10010, 'Betts', 'Developer', 15000),
Employee(10010, 'Tamer', 'Manager', 30000),
Employee(10001, 'James', 'Project Lead', 20000),
Employee(10002, 'Kathryn', 'Manager', 30000),
Employee(10003, 'Lara', 'Developer', 15000),
Employee(10004, 'Michael', 'Designer', 15000),
Employee(10005, 'Martin', 'Developer', 15000),
Employee(10006, 'Newberry', 'Developer', 15000),
Employee(10007, 'Balnc', 'Developer', 15000),
Employee(10008, 'Perry', 'Developer', 15000),
Employee(10009, 'Gable', 'Developer', 15000),
Employee(10010, 'Grimes', 'Developer', 15000),
Employee(10010, 'Lane', 'Project Lead', 20000),
Employee(10010, 'Doran', 'Developer', 15000),
Employee(10010, 'Betts', 'Developer', 15000),
Employee(10010, 'Tamer', 'Manager', 30000),
];
}
}
【问题讨论】：
标签： flutter datagrid syncfusion flutter-state