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Merge pull request #1 from SyncfusionExamples/KB
KB for Custom Caption Summary
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‎.gitignore‎

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# Miscellaneous
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*.class
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*.log
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*.pyc
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*.swp
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.DS_Store
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.atom/
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.build/
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.buildlog/
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.history
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.svn/
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.swiftpm/
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migrate_working_dir/
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# IntelliJ related
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*.iml
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*.ipr
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*.iws
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.idea/
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# The .vscode folder contains launch configuration and tasks you configure in
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# VS Code which you may wish to be included in version control, so this line
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# is commented out by default.
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#.vscode/
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# Flutter/Dart/Pub related
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**/doc/api/
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**/ios/Flutter/.last_build_id
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.dart_tool/
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.flutter-plugins
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.flutter-plugins-dependencies
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.pub-cache/
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.pub/
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/build/
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# Symbolication related
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app.*.symbols
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# Obfuscation related
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app.*.map.json
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# Android Studio will place build artifacts here
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/android/app/debug
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/android/app/profile
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/android/app/release

‎README.md‎

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# How-to-Display-Sum-and-Average-of-Grouped-Column-with-Custom-Caption-Summary-in-SfDataGrid
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This demo shows how to Display Sum and Average of Grouped Column with Custom Caption Summary in SfDataGrid
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In this article, we will show you how to display the sum and average of a grouped column with a custom caption summary in [Flutter DataTable](https://www.syncfusion.com/flutter-widgets/flutter-datagrid).
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Initialize the [SfDataGrid](https://pub.dev/documentation/syncfusion_flutter_datagrid/latest/datagrid/SfDataGrid-class.html) widget with the necessary properties. The [DataGridSource.performGrouping](https://pub.dev/documentation/syncfusion_flutter_datagrid/latest/datagrid/DataGridSource/performGrouping.html) method is triggered when grouping is applied to the SfDataGrid. Within this method, [custom logic](https://help.syncfusion.com/flutter/datagrid/grouping#custom-grouping) can be implemented to return a String based on specific grouping criteria.
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To support group caption summaries, two helper properties—groupColumn and occurrence—are used. These track the total salary and the number of employees in each group. As rows are grouped, the salary is added to the group's total in groupColumn, and the count is incremented in occurrence.
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These aggregated values are then used to calculate and display the sum and average salary for each group. This is done by customizing the text in the [buildGroupCaptionCellWidget](https://pub.dev/documentation/syncfusion_flutter_datagrid/latest/datagrid/DataGridSource/buildGroupCaptionCellWidget.html) method.
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```dart
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Map<String, int> groupColumn = {};
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Map<String, int> occurance = {};
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@override
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Widget? buildGroupCaptionCellWidget(
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RowColumnIndex rowColumnIndex,
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String summaryValue,
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) {
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final matchingKey = groupColumn.keys.firstWhere(
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(key) => summaryValue.contains(key),
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orElse: () => '',
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);
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final total = groupColumn[matchingKey] ?? 0;
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final count = occurance[matchingKey] ?? 1;
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final average = (total / count).ceilToDouble();
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return Container(
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padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 15),
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child: Text('$summaryValue | Total: $total | Average: $average'),
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);
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}
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@override
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String performGrouping(String columnName, DataGridRow row) {
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if (columnName != 'salary') {
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return super.performGrouping(columnName, row);
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}
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final int salary = row
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.getCells()
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.firstWhere((cell) => cell.columnName == columnName)
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.value;
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String label;
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if (salary > 25000 && salary <= 30000) {
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label = '<= 30 K & > 25 K';
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} else if (salary > 20000 && salary <= 25000) {
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label = '<= 25 K & > 20 K';
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} else if (salary > 15000 && salary <= 20000) {
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label = '<= 20 K & > 15 K';
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} else if (salary >= 10000 && salary <= 15000) {
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label = '<= 15 K & > 10 K';
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} else {
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label = '> 30 K';
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}
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groupColumn[label] = (groupColumn[label] ?? 0) + salary;
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occurance[label] = (occurance[label] ?? 0) + 1;
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return label;
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}
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```
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You can download this example on [GitHub](https://github.com/SyncfusionExamples/How-to-Display-Sum-and-Average-of-Grouped-Column-with-Custom-Caption-Summary-in-SfDataGrid.git).
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‎android/.gitignore‎

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gradle-wrapper.jar
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/.gradle
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/captures/
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/gradlew
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/gradlew.bat
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/local.properties
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GeneratedPluginRegistrant.java
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.cxx/
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# Remember to never publicly share your keystore.
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# See https://flutter.dev/to/reference-keystore
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key.properties
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**/*.keystore
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**/*.jks

‎android/app/build.gradle.kts‎

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plugins {
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id("com.android.application")
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id("kotlin-android")
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// The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
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id("dev.flutter.flutter-gradle-plugin")
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}
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android {
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namespace = "com.example.flutter_application_1"
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compileSdk = flutter.compileSdkVersion
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ndkVersion = flutter.ndkVersion
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compileOptions {
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sourceCompatibility = JavaVersion.VERSION_11
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targetCompatibility = JavaVersion.VERSION_11
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}
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kotlinOptions {
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jvmTarget = JavaVersion.VERSION_11.toString()
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}
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defaultConfig {
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// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
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applicationId = "com.example.flutter_application_1"
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// You can update the following values to match your application needs.
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// For more information, see: https://flutter.dev/to/review-gradle-config.
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minSdk = flutter.minSdkVersion
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targetSdk = flutter.targetSdkVersion
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versionCode = flutter.versionCode
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versionName = flutter.versionName
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}
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buildTypes {
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release {
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// TODO: Add your own signing config for the release build.
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// Signing with the debug keys for now, so `flutter run --release` works.
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signingConfig = signingConfigs.getByName("debug")
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}
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}
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}
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flutter {
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source = "../.."
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}

‎android/app/src/debug/AndroidManifest.xml‎

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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<!-- The INTERNET permission is required for development. Specifically,
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the Flutter tool needs it to communicate with the running application
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to allow setting breakpoints, to provide hot reload, etc.
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-->
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<uses-permission android:name="android.permission.INTERNET"/>
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</manifest>

‎android/app/src/main/AndroidManifest.xml‎

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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<application
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android:label="flutter_application_1"
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android:name="${applicationName}"
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android:icon="@mipmap/ic_launcher">
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<activity
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android:name=".MainActivity"
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android:exported="true"
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android:launchMode="singleTop"
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android:taskAffinity=""
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android:theme="@style/LaunchTheme"
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android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
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android:hardwareAccelerated="true"
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android:windowSoftInputMode="adjustResize">
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<!-- Specifies an Android theme to apply to this Activity as soon as
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the Android process has started. This theme is visible to the user
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while the Flutter UI initializes. After that, this theme continues
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to determine the Window background behind the Flutter UI. -->
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<meta-data
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android:name="io.flutter.embedding.android.NormalTheme"
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android:resource="@style/NormalTheme"
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/>
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<intent-filter>
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<action android:name="android.intent.action.MAIN"/>
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<category android:name="android.intent.category.LAUNCHER"/>
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</intent-filter>
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</activity>
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<!-- Don't delete the meta-data below.
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This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
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<meta-data
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android:name="flutterEmbedding"
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android:value="2" />
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</application>
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<!-- Required to query activities that can process text, see:
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https://developer.android.com/training/package-visibility and
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https://developer.android.com/reference/android/content/Intent#ACTION_PROCESS_TEXT.
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In particular, this is used by the Flutter engine in io.flutter.plugin.text.ProcessTextPlugin. -->
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<queries>
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<intent>
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<action android:name="android.intent.action.PROCESS_TEXT"/>
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<data android:mimeType="text/plain"/>
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</intent>
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</queries>
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</manifest>

‎android/app/src/main/kotlin/com/example/flutter_application_1/MainActivity.kt‎

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package com.example.flutter_application_1
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import io.flutter.embedding.android.FlutterActivity
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class MainActivity : FlutterActivity()

‎android/app/src/main/res/drawable-v21/launch_background.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<!-- Modify this file to customize your launch splash screen -->
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<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
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<item android:drawable="?android:colorBackground" />
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<!-- You can insert your own image assets here -->
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<!-- <item>
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<bitmap
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android:gravity="center"
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android:src="@mipmap/launch_image" />
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</item> -->
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</layer-list>

‎android/app/src/main/res/drawable/launch_background.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<!-- Modify this file to customize your launch splash screen -->
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<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
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<item android:drawable="@android:color/white" />
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<!-- You can insert your own image assets here -->
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<!-- <item>
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<bitmap
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android:gravity="center"
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android:src="@mipmap/launch_image" />
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</item> -->
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</layer-list>

‎android/app/src/main/res/mipmap-hdpi/ic_launcher.png‎

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