Enable prefer_const_constructors

analysis_options.yaml

@@ -82,8 +82,8 @@ linter:
     # - parameter_assignments # we do this commonly
     - prefer_adjacent_string_concatenation
     - prefer_collection_literals
-    # - prefer_conditional_assignment # not yet tested
+    - prefer_conditional_assignment
-    # - prefer_const_constructors
+    - prefer_const_constructors
     # - prefer_constructors_over_static_methods # not yet tested
     - prefer_contains
     - prefer_equal_for_default_values
@@ -107,7 +107,7 @@ linter:
     - unnecessary_brace_in_string_interps
     # - unnecessary_const
     - unnecessary_getters_setters
-    # - unnecessary_lambdas # https://github.com/dart-lang/linter/issues/498
+    - unnecessary_lambdas
     - unnecessary_new
     - unnecessary_null_aware_assignments
     - unnecessary_null_in_if_null_operators

lib/app.dart

@@ -113,7 +113,7 @@ class JournalApp extends StatelessWidget {
     }
 
     return MaterialApp(
-      key: ValueKey("App"),
+      key: const ValueKey("App"),
       title: 'GitJournal',
       theme: themeData,
       navigatorObservers: <NavigatorObserver>[JournalApp.observer],

lib/gitapp.dart

@@ -15,7 +15,7 @@ class GitApp extends StatelessWidget {
       home: Scaffold(
         key: _scaffoldKey,
         appBar: AppBar(
-          title: Text('Git Test'),
+          title: const Text('Git Test'),
         ),
         body: Column(
           children: _buildGitButtons(),
@@ -48,12 +48,12 @@ class GitApp extends StatelessWidget {
 
     return <Widget>[
       RaisedButton(
-          child: Text("Generate Keys"),
+          child: const Text("Generate Keys"),
           onPressed: () {
             generateSSHKeys(comment: "Git Sample App");
           }),
       RaisedButton(
-        child: Text("Git Clone"),
+        child: const Text("Git Clone"),
         onPressed: () async {
           try {
             await GitRepo.clone(basePath, cloneUrl);
@@ -65,25 +65,25 @@ class GitApp extends StatelessWidget {
         },
       ),
       RaisedButton(
-        child: Text("Git Pull"),
+        child: const Text("Git Pull"),
         onPressed: () async {
           gitRepo.pull();
         },
       ),
       RaisedButton(
-        child: Text("Git Add"),
+        child: const Text("Git Add"),
         onPressed: () async {
           gitRepo.add(".");
         },
       ),
       RaisedButton(
-        child: Text("Git Push"),
+        child: const Text("Git Push"),
         onPressed: () async {
           gitRepo.push();
         },
       ),
       RaisedButton(
-        child: Text("Git Commit"),
+        child: const Text("Git Commit"),
         onPressed: () async {
           gitRepo.commit(
             message: "Default message from GitJournal",
@@ -92,13 +92,13 @@ class GitApp extends StatelessWidget {
         },
       ),
       RaisedButton(
-        child: Text("Git Reset Last"),
+        child: const Text("Git Reset Last"),
         onPressed: () async {
           gitRepo.resetLast();
         },
       ),
       RaisedButton(
-        child: Text("Git Migrate"),
+        child: const Text("Git Migrate"),
         onPressed: () async {
           var baseGitPath = await getGitBaseDirectory();
           await migrateGitRepo(

lib/note.dart

@@ -72,9 +72,7 @@ class Note implements Comparable<Note> {
       }
     }
 
-    if (_created == null) {
+    _created ??= DateTime(0, 0, 0, 0, 0, 0, 0, 0);
-      _created = DateTime(0, 0, 0, 0, 0, 0, 0, 0);
-    }
   }
 
   bool hasValidDate() {

lib/oauthapp.dart

@@ -35,17 +35,17 @@ class OAuthAppState extends State<OAuthApp> {
       title: 'OAuth App',
       home: Scaffold(
         appBar: AppBar(
-          title: Text('OAuth Test'),
+          title: const Text('OAuth Test'),
         ),
         body: Column(children: <Widget>[
           RaisedButton(
-            child: Text("Open OAuth URL"),
+            child: const Text("Open OAuth URL"),
             onPressed: () {
               githost.launchOAuthScreen();
             },
           ),
           RaisedButton(
-            child: Text("List Repos"),
+            child: const Text("List Repos"),
             onPressed: () async {
               try {
                 var repos = await githost.listRepos();
@@ -58,7 +58,7 @@ class OAuthAppState extends State<OAuthApp> {
             },
           ),
           RaisedButton(
-            child: Text("Create Repo"),
+            child: const Text("Create Repo"),
             onPressed: () async {
               try {
                 var repo = await githost.createRepo("journal_test2");
@@ -69,7 +69,7 @@ class OAuthAppState extends State<OAuthApp> {
             },
           ),
           RaisedButton(
-            child: Text("Add Deploy Key"),
+            child: const Text("Add Deploy Key"),
             onPressed: () async {
               try {
                 await githost.addDeployKey(key, "vhanda/journal_test2");

lib/screens/githostsetup_autoconfigure.dart

@@ -140,24 +140,24 @@ class GitHostSetupAutoConfigureState extends State<GitHostSetupAutoConfigure> {
           'We need permission to perform the following steps:',
           style: Theme.of(context).textTheme.title,
         ),
-        SizedBox(height: 32.0),
+        const SizedBox(height: 32.0),
 
         // Step 1
         Text(
           "1. Create a new private repo called 'journal' or use the existing one",
           style: Theme.of(context).textTheme.body2,
         ),
-        SizedBox(height: 8.0),
+        const SizedBox(height: 8.0),
         Text(
           "2. Generate an SSH Key on this device",
           style: Theme.of(context).textTheme.body2,
         ),
-        SizedBox(height: 8.0),
+        const SizedBox(height: 8.0),
         Text(
           "3. Add the key as a deploy key with write access to the created repo",
           style: Theme.of(context).textTheme.body2,
         ),
-        SizedBox(height: 32.0),
+        const SizedBox(height: 32.0),
 
         GitHostSetupButton(
           text: "Authorize GitJournal",

lib/screens/githostsetup_clone_url.dart

@@ -83,12 +83,12 @@ class GitCloneUrlPageState extends State<GitCloneUrlPage> {
             style: Theme.of(context).textTheme.headline,
           ),
         ),
-        SizedBox(height: 16.0),
+        const SizedBox(height: 16.0),
         Padding(
           padding: const EdgeInsets.all(8.0),
           child: inputForm,
         ),
-        SizedBox(height: 8.0),
+        const SizedBox(height: 8.0),
         GitHostSetupButton(
           text: "Next",
           onPressed: formSubmitted,
@@ -178,28 +178,28 @@ class GitCloneUrlKnownProviderPageState
           'Please create a new git repository -',
           style: Theme.of(context).textTheme.title,
         ),
-        SizedBox(height: 32.0),
+        const SizedBox(height: 32.0),
 
         // Step 1
         Text(
           '1. Go to the website, create a repo and copy its git clone URL',
           style: Theme.of(context).textTheme.subtitle,
         ),
-        SizedBox(height: 8.0),
+        const SizedBox(height: 8.0),
         GitHostSetupButton(
           text: "Open Create New Repo Webpage",
           onPressed: widget.launchCreateUrlPage,
         ),
-        SizedBox(height: 16.0),
+        const SizedBox(height: 16.0),
 
         // Step 2
         Text(
           '2. Enter the Git clone URL',
           style: Theme.of(context).textTheme.subtitle,
         ),
-        SizedBox(height: 8.0),
+        const SizedBox(height: 8.0),
         inputForm,
-        SizedBox(height: 16.0),
+        const SizedBox(height: 16.0),
         GitHostSetupButton(
           text: "Next",
           onPressed: formSubmitted,

lib/screens/githostsetup_folder.dart

@@ -24,12 +24,12 @@ class GitHostSetupFolderPage extends StatelessWidget {
           'Would you like to store your journal entries in an existing folder?',
           style: Theme.of(context).textTheme.title,
         ),
-        SizedBox(height: 32.0),
+        const SizedBox(height: 32.0),
         FolderListWidget(
           folders: folders,
           onSelected: subFolderSelected,
         ),
-        SizedBox(height: 16.0),
+        const SizedBox(height: 16.0),
         GitHostSetupButton(
           text: "Ignore",
           onPressed: rootFolderSelected,

lib/screens/githostsetup_loading.dart

@@ -15,9 +15,9 @@ class GitHostSetupLoadingPage extends StatelessWidget {
           style: Theme.of(context).textTheme.display1,
         ),
       ),
-      SizedBox(height: 8.0),
+      const SizedBox(height: 8.0),
-      Padding(
+      const Padding(
-        padding: const EdgeInsets.all(8.0),
+        padding: EdgeInsets.all(8.0),
         child: CircularProgressIndicator(
           value: null,
         ),

lib/screens/githostsetup_screens.dart

@@ -281,7 +281,7 @@ class GitHostSetupScreenState extends State<GitHostSetupScreen> {
           ),
         ],
       ),
-      padding: EdgeInsets.all(16.0),
+      padding: const EdgeInsets.all(16.0),
     );
 
     var scaffold = Scaffold(
@@ -292,7 +292,7 @@ class GitHostSetupScreenState extends State<GitHostSetupScreen> {
             InkWell(
               child: Container(
                 child: Icon(Icons.arrow_back, size: 32.0),
-                padding: EdgeInsets.all(8.0),
+                padding: const EdgeInsets.all(8.0),
               ),
               onTap: () => Navigator.of(context).pop(),
             ),
@@ -505,7 +505,7 @@ class GitHostChoicePage extends StatelessWidget {
             "Select a Git Hosting Provider -",
             style: Theme.of(context).textTheme.headline,
           ),
-          SizedBox(height: 16.0),
+          const SizedBox(height: 16.0),
           GitHostSetupButton(
             text: "GitHub",
             iconUrl: 'assets/icon/github-icon.png',
@@ -513,7 +513,7 @@ class GitHostChoicePage extends StatelessWidget {
               onKnownGitHost(GitHostType.GitHub);
             },
           ),
-          SizedBox(height: 8.0),
+          const SizedBox(height: 8.0),
           GitHostSetupButton(
             text: "GitLab",
             iconUrl: 'assets/icon/gitlab-icon.png',
@@ -521,7 +521,7 @@ class GitHostChoicePage extends StatelessWidget {
               onKnownGitHost(GitHostType.GitLab);
             },
           ),
-          SizedBox(height: 8.0),
+          const SizedBox(height: 8.0),
           GitHostSetupButton(
             text: "Custom",
             onPressed: () async {
@@ -555,14 +555,14 @@ class GitHostAutoConfigureChoicePage extends StatelessWidget {
             "How do you want to do this?",
             style: Theme.of(context).textTheme.headline,
           ),
-          SizedBox(height: 16.0),
+          const SizedBox(height: 16.0),
           GitHostSetupButton(
             text: "Setup Automatically",
             onPressed: () {
               onDone(GitHostSetupType.Auto);
             },
           ),
-          SizedBox(height: 8.0),
+          const SizedBox(height: 8.0),
           GitHostSetupButton(
             text: "Let me do it manually",
             onPressed: () async {

lib/screens/githostsetup_sshkey.dart

@@ -32,40 +32,40 @@ class GitHostSetupSshKeyKnownProvider extends StatelessWidget {
           'In order to access this repository, this public key must be copied as a deploy key',
           style: Theme.of(context).textTheme.title,
         ),
-        SizedBox(height: 32.0),
+        const SizedBox(height: 32.0),
 
         // Step 1
         Text(
           '1. Copy the key',
           style: Theme.of(context).textTheme.subtitle,
         ),
-        SizedBox(height: 8.0),
+        const SizedBox(height: 8.0),
         PublicKeyWidget(publicKey),
-        SizedBox(height: 8.0),
+        const SizedBox(height: 8.0),
         GitHostSetupButton(
           text: "Copy Key",
           onPressed: () => copyKeyFunction(context),
         ),
-        SizedBox(height: 16.0),
+        const SizedBox(height: 16.0),
 
         // Step 2
         Text(
           '2. Open webpage, and paste the deploy key. Make sure it is given Write Access. ',
           style: Theme.of(context).textTheme.subtitle,
         ),
-        SizedBox(height: 8.0),
+        const SizedBox(height: 8.0),
         GitHostSetupButton(
           text: "Open Deploy Key Webpage",
           onPressed: openDeployKeyPage,
         ),
-        SizedBox(height: 16.0),
+        const SizedBox(height: 16.0),
 
         // Step 3
         Text(
           '3. Try Cloning ..',
           style: Theme.of(context).textTheme.subtitle,
         ),
-        SizedBox(height: 8.0),
+        const SizedBox(height: 8.0),
         GitHostSetupButton(
           text: "Clone Repo",
           onPressed: doneFunction,
@@ -106,35 +106,35 @@ class GitHostSetupSshKeyUnknownProvider extends StatelessWidget {
           'In order to access this repository, this public key must be copied as a deploy key',
           style: Theme.of(context).textTheme.title,
         ),
-        SizedBox(height: 32.0),
+        const SizedBox(height: 32.0),
 
         // Step 1
         Text(
           '1. Copy the key',
           style: Theme.of(context).textTheme.subtitle,
         ),
-        SizedBox(height: 8.0),
+        const SizedBox(height: 8.0),
         PublicKeyWidget(publicKey),
-        SizedBox(height: 8.0),
+        const SizedBox(height: 8.0),
         GitHostSetupButton(
           text: "Copy Key",
           onPressed: () => copyKeyFunction(context),
         ),
-        SizedBox(height: 16.0),
+        const SizedBox(height: 16.0),
 
         // Step 2
         Text(
           '2. Give this SSH Key access to the git repo. (You need to figure it out yourself)',
           style: Theme.of(context).textTheme.subtitle,
         ),
-        SizedBox(height: 16.0),
+        const SizedBox(height: 16.0),
 
         // Step 3
         Text(
           '3. Try Cloning ..',
           style: Theme.of(context).textTheme.subtitle,
         ),
-        SizedBox(height: 8.0),
+        const SizedBox(height: 8.0),
         GitHostSetupButton(
           text: "Clone Repo",
           onPressed: doneFunction,

lib/screens/home_screen.dart

@@ -18,7 +18,7 @@ class HomeScreen extends StatelessWidget {
     final appState = container.appState;
 
     var createButton = FloatingActionButton(
-      key: ValueKey("FAB"),
+      key: const ValueKey("FAB"),
       onPressed: () => _newPost(context),
       child: Icon(Icons.add),
     );
@@ -40,7 +40,7 @@ class HomeScreen extends StatelessWidget {
     bool shouldShowBadge =
         !appState.remoteGitRepoConfigured && appState.hasJournalEntries;
     var appBarMenuButton = BadgeIconButton(
-      key: ValueKey("DrawerButton"),
+      key: const ValueKey("DrawerButton"),
       icon: const Icon(Icons.menu),
       itemCount: shouldShowBadge ? 1 : 0,
       onPressed: () {
@@ -51,7 +51,7 @@ class HomeScreen extends StatelessWidget {
     return Scaffold(
       key: _scaffoldKey,
       appBar: AppBar(
-        title: Text('GitJournal'),
+        title: const Text('GitJournal'),
         leading: appBarMenuButton,
         actions: <Widget>[
           IconButton(

lib/screens/note_editor.dart

@@ -60,7 +60,7 @@ class NoteEditorState extends State<NoteEditor> {
       appBar: AppBar(
         title: Text(title),
         leading: IconButton(
-          key: ValueKey("NewEntry"),
+          key: const ValueKey("NewEntry"),
           icon: Icon(Icons.check),
           onPressed: () {
             _saveNote(context);
@@ -102,7 +102,7 @@ class NoteEditorState extends State<NoteEditor> {
               ),
               PopupMenuItem<NoteEditorDropDownChoices>(
                 value: NoteEditorDropDownChoices.SwitchEditor,
-                child: rawEditor ? Text('Rich Editor') : Text('Raw Editor'),
+                child: rawEditor ? const Text('Rich Editor') : const Text('Raw Editor'),
               ),
             ],
           ),

lib/screens/note_viewer.dart

@@ -49,7 +49,7 @@ class NoteBrowsingScreenState extends State<NoteBrowsingScreen> {
 
     return Scaffold(
       appBar: AppBar(
-        title: Text('TIMELINE'),
+        title: const Text('TIMELINE'),
         actions: <Widget>[
           IconButton(
             icon: Icon(Icons.delete),
@@ -106,14 +106,14 @@ class NoteBrowsingScreenState extends State<NoteBrowsingScreen> {
       actions: <Widget>[
         FlatButton(
           onPressed: () => Navigator.pop(context),
-          child: Text('Cancel'),
+          child: const Text('Cancel'),
         ),
         FlatButton(
           onPressed: () {
             Navigator.pop(context); // Alert box
             _deleteNote(context);
           },
-          child: Text('Delete'),
+          child: const Text('Delete'),
         ),
       ],
     );
@@ -142,7 +142,7 @@ class NoteViewer extends StatelessWidget {
             data: note.body,
             styleSheet: MarkdownStyleSheet.fromTheme(theme),
           ),
-          SizedBox(height: 64.0),
+          const SizedBox(height: 64.0),
           // _buildFooter(context),
         ],
         crossAxisAlignment: CrossAxisAlignment.start,

lib/screens/onboarding_screens.dart

@@ -42,7 +42,7 @@ class OnBoardingScreenState extends State<OnBoardingScreen> {
       var row = Row(
         children: <Widget>[
           OnBoardingBottomButton(
-            key: ValueKey("Skip"),
+            key: const ValueKey("Skip"),
             text: "Skip",
             onPressed: _finish,
           ),
@@ -61,7 +61,7 @@ class OnBoardingScreenState extends State<OnBoardingScreen> {
             ),
           ),
           OnBoardingBottomButton(
-            key: ValueKey("Next"),
+            key: const ValueKey("Next"),
             text: "Next",
             onPressed: _nextPage,
           ),
@@ -81,7 +81,7 @@ class OnBoardingScreenState extends State<OnBoardingScreen> {
         width: double.infinity,
         height: _bottomBarHeight,
         child: RaisedButton(
-          key: ValueKey("GetStarted"),
+          key: const ValueKey("GetStarted"),
           child: Text(
             "Get Started",
             textAlign: TextAlign.center,
@@ -98,7 +98,7 @@ class OnBoardingScreenState extends State<OnBoardingScreen> {
         width: double.infinity,
         height: double.infinity,
         child: pageView,
-        padding: EdgeInsets.all(16.0),
+        padding: const EdgeInsets.all(16.0),
       ),
       bottomNavigationBar: AnimatedSwitcher(
         duration: Duration(milliseconds: 300),
@@ -161,7 +161,7 @@ class OnBoardingPage1 extends StatelessWidget {
           height: 200,
           fit: BoxFit.fill,
         ),
-        SizedBox(height: 16.0),
+        const SizedBox(height: 16.0),
         Text(
           "GitJournal",
           style: headerTextStyle,
@@ -173,7 +173,7 @@ class OnBoardingPage1 extends StatelessWidget {
       child: Column(
         children: <Widget>[
           Center(child: header),
-          SizedBox(height: 64.0),
+          const SizedBox(height: 64.0),
           AutoSizeText(
             "A Journaling App focused on\nOpenness and Data Privacy",
             style: textTheme.headline,
@@ -201,7 +201,7 @@ class OnBoardingPage2 extends StatelessWidget {
           //height: 200,
           fit: BoxFit.fill,
         ),
-        SizedBox(height: 16.0),
+        const SizedBox(height: 16.0),
       ],
     );
 
@@ -209,7 +209,7 @@ class OnBoardingPage2 extends StatelessWidget {
       child: Column(
         children: <Widget>[
           Center(child: header),
-          SizedBox(height: 64.0),
+          const SizedBox(height: 64.0),
           AutoSizeText(
             "Your Journal Entries are stored in a\nstandard Markdown + YAML\nHeader format",
             style: textTheme.headline,
@@ -237,7 +237,7 @@ class OnBoardingPage3 extends StatelessWidget {
           //height: 200,
           fit: BoxFit.fill,
         ),
-        SizedBox(height: 16.0),
+        const SizedBox(height: 16.0),
       ],
     );
 
@@ -245,7 +245,7 @@ class OnBoardingPage3 extends StatelessWidget {
       child: Column(
         children: <Widget>[
           Center(child: header),
-          SizedBox(height: 64.0),
+          const SizedBox(height: 64.0),
           AutoSizeText(
             "Sync your Local Git Repo\nwith any provider",
             style: textTheme.headline,

lib/screens/settings_screen.dart

@@ -9,7 +9,7 @@ class SettingsScreen extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text('Settings'),
+        title: const Text('Settings'),
         leading: IconButton(
           icon: Icon(Icons.arrow_back),
           onPressed: () {
@@ -124,7 +124,7 @@ class SettingsListState extends State<SettingsList> {
         },
       ),
       ListTile(
-        title: Text("Font Size"),
+        title: const Text("Font Size"),
         subtitle: Text(settings.noteFontSize.toPublicString()),
         onTap: () async {
           var fontSize = await showDialog<NoteFontSize>(
@@ -142,7 +142,7 @@ class SettingsListState extends State<SettingsList> {
       SettingsHeader("Git Author Settings"),
       ListTile(title: gitAuthorForm),
       ListTile(title: gitAuthorEmailForm),
-      SizedBox(height: 16.0),
+      const SizedBox(height: 16.0),
       SettingsHeader("Storage"),
       ListPreference(
         title: "File Name",
@@ -156,7 +156,7 @@ class SettingsListState extends State<SettingsList> {
           setState(() {});
         },
       ),
-      SizedBox(height: 16.0),
+      const SizedBox(height: 16.0),
       SettingsHeader("Analytics"),
       BoolPreference(
         title: "Collect Anonymous Usage Statistics",
@@ -188,7 +188,7 @@ class SettingsHeader extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Padding(
-      padding: EdgeInsets.only(left: 16.0, bottom: 0.0, top: 20.0),
+      padding: const EdgeInsets.only(left: 16.0, bottom: 0.0, top: 20.0),
       child: Text(
         text,
         style: TextStyle(
@@ -256,10 +256,10 @@ class FontSizeSettingsDialog extends StatelessWidget {
           children: sizes,
         ),
       ),
-      contentPadding: EdgeInsets.all(0.0),
+      contentPadding: const EdgeInsets.all(0.0),
       actions: <Widget>[
         FlatButton(
-          child: Text('CANCEL'),
+          child: const Text('CANCEL'),
           onPressed: () {
             Navigator.of(context).pop();
           },
@@ -326,10 +326,10 @@ class ListPreference extends StatelessWidget {
                     children: children,
                   ),
                 ),
-                contentPadding: EdgeInsets.all(0.0),
+                contentPadding: const EdgeInsets.all(0.0),
                 actions: <Widget>[
                   FlatButton(
-                    child: Text('CANCEL'),
+                    child: const Text('CANCEL'),
                     onPressed: () {
                       Navigator.of(context).pop();
                     },

lib/themes.dart

@@ -3,15 +3,15 @@ import 'package:flutter/material.dart';
 class Themes {
   static final light = ThemeData(
     brightness: Brightness.light,
-    primaryColor: Color(0xFF66bb6a),
+    primaryColor: const Color(0xFF66bb6a),
-    primaryColorLight: Color(0xFF98ee99),
+    primaryColorLight: const Color(0xFF98ee99),
-    primaryColorDark: Color(0xFF338a3e),
+    primaryColorDark: const Color(0xFF338a3e),
-    accentColor: Color(0xff6d4c41),
+    accentColor: const Color(0xff6d4c41),
   );
 
   static final dark = ThemeData(
     brightness: Brightness.dark,
-    primaryColor: Color(0xff212121),
+    primaryColor: const Color(0xff212121),
-    accentColor: Color(0xff689f38),
+    accentColor: const Color(0xff689f38),
   );
 }

lib/widgets/app_drawer.dart

@@ -50,7 +50,7 @@ class AppDrawer extends StatelessWidget {
               child: DecoratedBox(
                 decoration: BoxDecoration(
                   image: DecorationImage(
-                    image: AssetImage('assets/icon/icon.png'),
+                    image: const AssetImage('assets/icon/icon.png'),
                   ),
                 ),
               ),

lib/widgets/icon_dismissable.dart

@@ -19,7 +19,7 @@ class IconDismissable extends Dismissible {
             color: backgroundColor,
             alignment: AlignmentDirectional.centerStart,
             child: Padding(
-              padding: EdgeInsets.fromLTRB(16.0, 0.0, 0.0, 0.0),
+              padding: const EdgeInsets.fromLTRB(16.0, 0.0, 0.0, 0.0),
               child: Icon(
                 Icons.delete,
                 color: Colors.white,
@@ -30,7 +30,7 @@ class IconDismissable extends Dismissible {
             color: backgroundColor,
             alignment: AlignmentDirectional.centerEnd,
             child: Padding(
-              padding: EdgeInsets.fromLTRB(0.0, 0.0, 16.0, 0.0),
+              padding: const EdgeInsets.fromLTRB(0.0, 0.0, 16.0, 0.0),
               child: Icon(
                 Icons.delete,
                 color: Colors.white,

lib/widgets/journal_list.dart

@@ -86,13 +86,13 @@ class JournalList extends StatelessWidget {
     var children = <Widget>[];
     if (time.isNotEmpty) {
       children.addAll(<Widget>[
-        SizedBox(height: 4.0),
+        const SizedBox(height: 4.0),
         Text(time, style: textTheme.body1),
       ]);
     }
 
     children.addAll(<Widget>[
-      SizedBox(height: 4.0),
+      const SizedBox(height: 4.0),
       Text(
         body,
         maxLines: 3,
@@ -115,7 +115,7 @@ class JournalList extends StatelessWidget {
     );
 
     return Padding(
-      padding: EdgeInsets.only(top: 8.0, bottom: 8.0),
+      padding: const EdgeInsets.only(top: 8.0, bottom: 8.0),
       child: tile,
     );
   }

lib/widgets/note_header.dart

@@ -30,7 +30,7 @@ class NoteHeader extends StatelessWidget {
     var w = Row(
       children: <Widget>[
         bigNum,
-        SizedBox(width: 8.0),
+        const SizedBox(width: 8.0),
         Column(
           children: <Widget>[
             dateText,
@@ -43,7 +43,7 @@ class NoteHeader extends StatelessWidget {
     );
 
     return Padding(
-      padding: EdgeInsets.only(top: 8.0, bottom: 18.0),
+      padding: const EdgeInsets.only(top: 8.0, bottom: 18.0),
       child: w,
     );
   }