Label column

example/lib/main.dart

@@ -31,22 +31,37 @@ class MyHomePage extends StatefulWidget {
 class _MyHomePageState extends State<MyHomePage> {
   late GanttChartController<ExampleEventItem> _controller;
 
+  final List<ExampleEventItem> _items = Data.dummyData;
+
   @override
   void initState() {
     super.initState();
     _controller = GanttChartController<ExampleEventItem>(
-      items: Data.dummyData,
-      taskBuilder: (item) => GanttTask(
-        label: item.title,
-        startDate: item.start,
-        endDate: item.end,
-        tooltip:
-            '${item.title}\n${item.start.formattedDate} - ${item.end.formattedDate}',
-      ),
-      taskSort: (a, b) => a.startDate.compareTo(b.startDate),
-      activityLabelBuilder: (item) => item.group,
-      activitySort: (a, b) =>
-          a.tasks.first.startDate.compareTo(b.tasks.first.startDate),
+      items: _items,
+      itemBuilder: (items) {
+        List<GanttActivity> activities = [];
+        Map<String, List<GanttTask>> labelTasks = {};
+
+        for (var item in items) {
+          final label = item.group;
+          (labelTasks[label] ??= []).add(GanttTask(
+            label: item.title,
+            startDate: item.start,
+            endDate: item.end,
+            tooltip:
+                '${item.title}\n${item.start.formattedDate} - ${item.end.formattedDate}',
+          ));
+        }
+
+        activities = labelTasks.entries.map((e) {
+          final tasks = e.value;
+          tasks.sort((a, b) => a.startDate.compareTo(b.startDate));
+          return GanttActivity(label: e.key, tasks: tasks);
+        }).toList();
+        activities.sort((a, b) =>
+            a.tasks.first.startDate.compareTo(b.tasks.first.startDate));
+        return activities;
+      },
       highlightedDates: [DateTime.now().add(const Duration(days: 5))],
       showFullWeeks: false,
     );
@@ -91,7 +106,7 @@ class _MyHomePageState extends State<MyHomePage> {
       ),
       floatingActionButton: FloatingActionButton(
         backgroundColor: Colors.redAccent,
-        onPressed: () => _controller.addItems(Data.dummyData),
+        onPressed: () => setState(() => _controller.addItems(Data.dummyData)),
         child: const Icon(Icons.restore, color: Colors.white),
       ),
     );

example/windows/flutter/CMakeLists.txt

@@ -10,6 +10,11 @@ include(${EPHEMERAL_DIR}/generated_config.cmake)
 # https://github.com/flutter/flutter/issues/57146.
 set(WRAPPER_ROOT "${EPHEMERAL_DIR}/cpp_client_wrapper")
 
+# Set fallback configurations for older versions of the flutter tool.
+if (NOT DEFINED FLUTTER_TARGET_PLATFORM)
+  set(FLUTTER_TARGET_PLATFORM "windows-x64")
+endif()
+
 # === Flutter Library ===
 set(FLUTTER_LIBRARY "${EPHEMERAL_DIR}/flutter_windows.dll")
 
@@ -92,7 +97,7 @@ add_custom_command(
   COMMAND ${CMAKE_COMMAND} -E env
     ${FLUTTER_TOOL_ENVIRONMENT}
     "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.bat"
-      windows-x64 $<CONFIG>
+      ${FLUTTER_TARGET_PLATFORM} $<CONFIG>
   VERBATIM
 )
 add_custom_target(flutter_assemble DEPENDS

lib/gantt_view.dart

@@ -4,6 +4,7 @@ export 'src/gantt_chart.dart';
 
 export 'src/controller/gantt_data_controller.dart';
 
+export 'src/model/gantt_activity.dart';
 export 'src/model/gantt_task.dart';
 export 'src/model/timeline_axis_type.dart';
 export 'src/model/tooltip_type.dart';