🎨 Make widgets constant.

Author: AlexV525

example/lib/pages/home_page.dart

@@ -68,7 +68,7 @@ class _HomePageState extends State<HomePage> {
               mainAxisAlignment: MainAxisAlignment.spaceEvenly,
               crossAxisAlignment: CrossAxisAlignment.start,
               children: <Widget>[
-                Text(
+                const Text(
                   'WeChat Asset Picker',
                   style: TextStyle(
                     fontSize: 18.0,
@@ -112,14 +112,14 @@ class _HomePageState extends State<HomePage> {
         bottomNavigationBar: BottomNavigationBar(
           currentIndex: currentIndex,
           onTap: selectIndex,
-          items: <BottomNavigationBarItem>[
+          items: const <BottomNavigationBarItem>[
             BottomNavigationBarItem(
               icon: Icon(Icons.photo_library),
-              title: const Text('Multi'),
+              title: Text('Multi'),
             ),
             BottomNavigationBarItem(
               icon: Icon(Icons.photo),
-              title: const Text('Single'),
+              title: Text('Single'),
             ),
           ],
         ),

example/lib/pages/multi_assets_page.dart

@@ -261,7 +261,7 @@ class _MultiAssetsPageState extends State<MultiAssetsPage> {
                 children: <Widget>[
                   Text(
                     model.name,
-                    style: TextStyle(
+                    style: const TextStyle(
                       fontSize: 18.0,
                       fontWeight: FontWeight.bold,
                     ),
@@ -275,7 +275,7 @@ class _MultiAssetsPageState extends State<MultiAssetsPage> {
                 ],
               ),
             ),
-            Icon(
+            const Icon(
               Icons.chevron_right,
               color: Colors.grey,
             ),
@@ -453,13 +453,13 @@ class _MultiAssetsPageState extends State<MultiAssetsPage> {
                         horizontal: 10.0,
                       ),
                       padding: const EdgeInsets.all(4.0),
-                      decoration: BoxDecoration(
+                      decoration: const BoxDecoration(
                         shape: BoxShape.circle,
                         color: Colors.grey,
                       ),
                       child: Text(
                         '${assets.length}',
-                        style: TextStyle(
+                        style: const TextStyle(
                           color: Colors.white,
                           height: 1.0,
                         ),

example/lib/pages/single_assets_page.dart

@@ -256,7 +256,7 @@ class _SingleAssetPageState extends State<SingleAssetPage> {
                 children: <Widget>[
                   Text(
                     model.name,
-                    style: TextStyle(
+                    style: const TextStyle(
                       fontSize: 18.0,
                       fontWeight: FontWeight.bold,
                     ),
@@ -268,7 +268,7 @@ class _SingleAssetPageState extends State<SingleAssetPage> {
                 ],
               ),
             ),
-            Icon(
+            const Icon(
               Icons.chevron_right,
               color: Colors.grey,
             ),

lib/src/widget/asset_picker.dart

@@ -834,7 +834,7 @@ class AssetPicker extends StatelessWidget {
                   reverseDuration: switchingPathDuration,
                   child: selected
                       ? isSingleAssetMode
-                          ? Icon(Icons.check, size: 18.0)
+                          ? const Icon(Icons.check, size: 18.0)
                           : Text(
                               '${selectedAssets.indexOf(asset) + 1}',
                               style: TextStyle(

lib/src/widget/asset_picker_viewer.dart

@@ -315,7 +315,7 @@ class AssetPickerViewerState extends State<AssetPickerViewer>
                   builder: (BuildContext _, AsyncSnapshot<int> snapshot) {
                     return Text(
                       '${snapshot.data + 1}/${widget.assets.length}',
-                      style: TextStyle(
+                      style: const TextStyle(
                         fontSize: 18.0,
                         fontWeight: FontWeight.bold,
                       ),
@@ -498,7 +498,7 @@ class AssetPickerViewerState extends State<AssetPickerViewer>
   Widget _audioPreviewItem(AssetEntity asset) {
     return ColoredBox(
       color: context.themeData.dividerColor,
-      child: Center(child: Icon(Icons.audiotrack)),
+      child: const Center(child: Icon(Icons.audiotrack)),
     );
   }
 
@@ -616,12 +616,12 @@ class AssetPickerViewerState extends State<AssetPickerViewer>
             child: isSelected
                 ? Text(
                     (currentIndex + 1).toString(),
-                    style: TextStyle(
+                    style: const TextStyle(
                       fontSize: 16.0,
                       fontWeight: FontWeight.bold,
                     ),
                   )
-                : Icon(Icons.check, size: 20.0),
+                : const Icon(Icons.check, size: 20.0),
           ),
         ),
       ),

lib/src/widget/builder/audio_page_builder.dart

@@ -129,7 +129,7 @@ class _AudioPageBuilderState extends State<AudioPageBuilder> {
         },
         child: Container(
           margin: const EdgeInsets.all(20.0),
-          decoration: BoxDecoration(
+          decoration: const BoxDecoration(
             boxShadow: <BoxShadow>[BoxShadow(color: Colors.black12)],
             shape: BoxShape.circle,
           ),

lib/src/widget/builder/video_page_builder.dart

@@ -140,7 +140,7 @@ class _VideoPageBuilderState extends State<VideoPageBuilder> {
                       child: GestureDetector(
                         onTap: playButtonCallback,
                         child: DecoratedBox(
-                          decoration: BoxDecoration(
+                          decoration: const BoxDecoration(
                             boxShadow: <BoxShadow>[
                               BoxShadow(color: Colors.black12)
                             ],