about page, etc; v0.3.0

CHANGELOG.md

@@ -1,3 +1,10 @@
+## 0.3.0
+
+* Add About page
+* Add "check new version" & download from app
+* Replace Trace result's broken video with image
+* Some UIs change
+
 ## 0.2.0
 
 * App icon added

README.md

@@ -9,7 +9,7 @@ Sauce finder
 * [ ] Implement on-the-air update (auto-updater)
 * [x] ~~App's icon~~
 * [ ] **Better app's icon**
-* [ ] App's about page
+* [x] ~~App's about page~~
 * [ ] Search's history
 * [ ] **Better state management**
 * [ ] **Refactoring**

lib/common/common.dart

@@ -284,6 +284,17 @@ class NoResultException implements Exception {
   }
 }
 
+class NoSupportedApkException implements Exception {
+  String message;
+
+  NoSupportedApkException([this.message]);
+
+  String toString() {
+    if (message == null) return "Exception";
+    return "$message";
+  }
+}
+
 properImageHelp(BuildContext context, ScrollController _helpController) {
   showDialog(
       context: context,
@@ -358,3 +369,26 @@ loadingDialog({@required BuildContext scaffoldContext, CancelToken token}) {
     },
   );
 }
+
+showSnackBar(
+    {@required String msg,
+    @required ScaffoldState state,
+    SnackBarAction act,
+    Duration dur = const Duration(seconds: 4)}) {
+  state?.removeCurrentSnackBar();
+  state?.showSnackBar(SnackBar(
+    content: Text("$msg"),
+    behavior: SnackBarBehavior.floating,
+    action: act,
+    duration: dur,
+  ));
+}
+
+double mapRange(
+    {@required double input,
+    @required double x1,
+    @required double y1,
+    @required double x2,
+    @required double y2}) {
+  return (input - x1) / (y1 - x1) * (y2 - x2) + x2;
+}