Resolve "Allow multiline parameter item"

Closes #12 (closed)

lib/parameters/pages/parameters.dart

@@ -21,13 +21,15 @@ class PageParameters extends StatelessWidget {
     // Activity settings (top)
     for (ApplicationSettingsParameter parameter in appConfig.activitySettings) {
       if (parameter.displayedOnTop) {
-        lines.add(Row(
-          mainAxisAlignment: MainAxisAlignment.spaceBetween,
-          children: buildParametersLine(
-            parameter: parameter,
-            isEnabled: !canBeResumed,
-          ),
-        ));
+        for (var itemsLine in buildParametersLines(
+          parameter: parameter,
+          isEnabled: !canBeResumed,
+        )) {
+          lines.add(Row(
+            mainAxisAlignment: MainAxisAlignment.spaceBetween,
+            children: itemsLine,
+          ));
+        }
 
         lines.add(SizedBox(height: separatorHeight));
       }
@@ -75,13 +77,15 @@ class PageParameters extends StatelessWidget {
     // Activity settings (bottom)
     for (ApplicationSettingsParameter parameter in appConfig.activitySettings) {
       if (!parameter.displayedOnTop) {
-        lines.add(Row(
-          mainAxisAlignment: MainAxisAlignment.spaceBetween,
-          children: buildParametersLine(
-            parameter: parameter,
-            isEnabled: !canBeResumed,
-          ),
-        ));
+        for (var itemsLine in buildParametersLines(
+          parameter: parameter,
+          isEnabled: !canBeResumed,
+        )) {
+          lines.add(Row(
+            mainAxisAlignment: MainAxisAlignment.spaceBetween,
+            children: itemsLine,
+          ));
+        }
 
         lines.add(SizedBox(height: separatorHeight));
       }
@@ -92,7 +96,7 @@ class PageParameters extends StatelessWidget {
     );
   }
 
-  List<Widget> buildParametersLine({
+  List<List<Widget>> buildParametersLines({
     required ApplicationSettingsParameter parameter,
     required bool isEnabled,
   }) {
@@ -103,6 +107,10 @@ class PageParameters extends StatelessWidget {
       return [];
     }
 
+    final int itemsPerLine =
+        parameter.itemsPerLine != 0 ? parameter.itemsPerLine : items.length;
+
+    // Build linear list
     for (ApplicationSettingsParameterItemValue item in items) {
       final Widget parameterButton = BlocBuilder<ActivitySettingsCubit, ActivitySettingsState>(
         builder: (BuildContext context, ActivitySettingsState activitySettingsState) {
@@ -110,7 +118,7 @@ class PageParameters extends StatelessWidget {
               BlocProvider.of<ActivitySettingsCubit>(context);
 
           final double displayWidth = MediaQuery.of(context).size.width;
-          final double itemWidth = displayWidth / items.length - 4;
+          final double itemWidth = displayWidth / itemsPerLine - 4;
 
           return SizedBox.square(
             dimension: itemWidth,
@@ -132,6 +140,21 @@ class PageParameters extends StatelessWidget {
       parameterButtons.add(parameterButton);
     }
 
-    return parameterButtons;
+    // Split buttons in lines according to items count limit per line
+    final List<List<Widget>> lines = [];
+
+    List<Widget> line = [];
+    for (var parameterButton in parameterButtons) {
+      line.add(parameterButton);
+      if (line.length == itemsPerLine) {
+        lines.add(line);
+        line = [];
+      }
+    }
+    if (line.length != itemsPerLine) {
+      lines.add(line);
+    }
+
+    return lines;
   }
 }