Resolve "Scroll too long parameters page"

Closes #13 (closed)

lib/parameters/pages/parameters.dart

@@ -12,36 +12,49 @@ class PageParameters extends StatelessWidget {
   final ApplicationConfigDefinition appConfig;
   final bool canBeResumed;
 
-  final double separatorHeight = 8.0;
+  final double separatorHeight = 4.0;
 
   @override
   Widget build(BuildContext context) {
-    final List<Widget> lines = [];
-
     // Activity settings (top)
+    final List<Widget> blockTop = [];
     for (ApplicationSettingsParameter parameter in appConfig.activitySettings) {
       if (parameter.displayedOnTop) {
-        for (var itemsLine in buildParametersLines(
+        for (List<Widget> itemsLine in buildParametersLines(
           parameter: parameter,
           isEnabled: !canBeResumed,
         )) {
-          lines.add(Row(
+          blockTop.add(Row(
             mainAxisAlignment: MainAxisAlignment.spaceBetween,
             children: itemsLine,
           ));
         }
-
-        lines.add(SizedBox(height: separatorHeight));
+        blockTop.add(SizedBox(height: separatorHeight));
       }
     }
 
-    lines.add(Expanded(
-      child: SizedBox(height: separatorHeight),
+    // Activity settings (bottom)
+    final List<Widget> blockBottom = [];
+    for (ApplicationSettingsParameter parameter in appConfig.activitySettings) {
+      if (!parameter.displayedOnTop) {
+        for (List<Widget> itemsLine in buildParametersLines(
+          parameter: parameter,
+          isEnabled: !canBeResumed,
+        )) {
+          blockBottom.add(Row(
+            mainAxisAlignment: MainAxisAlignment.spaceBetween,
+            children: itemsLine,
           ));
+        }
+        blockBottom.add(SizedBox(height: separatorHeight));
+      }
+    }
 
+    // Actions buttons (middle block)
+    final List<Widget> blockActions = [];
     if (canBeResumed) {
       // Resume activity
-      lines.add(AspectRatio(
+      blockActions.add(AspectRatio(
         aspectRatio: 3,
         child: ActivityButtonResumeSaved(
           onPressed: () {
@@ -50,7 +63,7 @@ class PageParameters extends StatelessWidget {
         ),
       ));
       // Delete saved activity
-      lines.add(SizedBox.square(
+      blockActions.add(SizedBox.square(
         dimension: MediaQuery.of(context).size.width / 5,
         child: ActivityButtonDeleteSaved(
           onPressed: () {
@@ -60,7 +73,7 @@ class PageParameters extends StatelessWidget {
       ));
     } else {
       // Start new activity
-      lines.add(
+      blockActions.add(
         AspectRatio(
           aspectRatio: 3,
           child: ActivityButtonStartNew(
@@ -71,29 +84,25 @@ class PageParameters extends StatelessWidget {
         ),
       );
     }
+    blockActions.add(SizedBox(height: separatorHeight));
 
-    lines.add(SizedBox(height: separatorHeight));
+    // Global blocks list
+    final List<Widget> blocks = [
+      Expanded(
+        child: ListView(
+          children: blockTop,
+        ),
+      ),
+      SizedBox(height: separatorHeight),
+    ];
 
-    // Activity settings (bottom)
-    for (ApplicationSettingsParameter parameter in appConfig.activitySettings) {
-      if (!parameter.displayedOnTop) {
-        for (var itemsLine in buildParametersLines(
-          parameter: parameter,
-          isEnabled: !canBeResumed,
-        )) {
-          lines.add(Row(
-            mainAxisAlignment: MainAxisAlignment.spaceBetween,
-            children: itemsLine,
-          ));
-        }
+    blocks.addAll(blockActions);
 
-        lines.add(SizedBox(height: separatorHeight));
-      }
+    if (blockBottom.isNotEmpty) {
+      blocks.addAll(blockBottom);
     }
 
-    return Column(
-      children: lines,
-    );
+    return Column(children: blocks);
   }
 
   List<List<Widget>> buildParametersLines({