Refactor visibility_detector to avoid forcing compositing. (#367)

Author: dnfield

packages/visibility_detector/CHANGELOG.md

@@ -1,36 +1,51 @@
-# 0.3.3
+# CHANGELOG
+
+## 0.4.0
+
+* Refactor to avoid forcing composition in the layer/render trees.
+* Remove `VisibilityDetectorLayer`.
+* Add `RenderVisibilityDetectorBase` as a mixin that mostly takes over
+  functionality from the old layer.
+* Remove the lookup map/method for getting former screen rects and instead add
+  the rect to `VisibilityInfo`.
+
+## 0.3.3
+
 * Re-apply Flutter framework bindings' null safety calls but set SDK
   constraints correctly to 2.12.0 instead.
 
-# 0.3.2
+## 0.3.2
+
 * Reverts change from 0.3.0 where the Flutter version constraint should have
   been set to 2.12.0 instead of 2.10.5.
 
-# 0.3.1-dev
+## 0.3.1-dev
+
 * Populate the pubspec `repository` field.
 
-# 0.3.0
+## 0.3.0
+
 * Move to Flutter version 2.10.5 and update dependencies' null safety calls.
 
-# 0.2.2
+## 0.2.2
 
 * Minor internal changes to maintain forward-compatibility with [flutter#91753](https://github.com/flutter/flutter/pull/91753).
 
-# 0.2.1
+## 0.2.1
 
 * Bug fix for using VisibilityDetector with FittedBox and Transform.scale [issue #285](https://github.com/google/flutter.widgets/issues/285).
 
-# 0.2.0
+## 0.2.0
 
 * Added `SliverVisibilityDetector` to report visibility of `RenderSliver`-based
   widgets.  Fixes [issue #174](https://github.com/google/flutter.widgets/issues/174).
 
-# 0.2.0-nullsafety.1
+## 0.2.0-nullsafety.1
 
 * Revert change to add `VisibilityDetectorController.scheduleNotification`,
   which introduced unexpected memory usage.
 
-# 0.2.0-nullsafety.0
+## 0.2.0-nullsafety.0
 
 * Update to null safety.
 
@@ -41,7 +56,7 @@
 * Add `VisibilityDetectorController.scheduleNotification` to force firing a
   visibility callback.
 
-# 0.1.5
+## 0.1.5
 
 * Compatibility fixes to `demo.dart` for Flutter 1.13.8.
 
@@ -52,24 +67,24 @@
 
 * Added a "Known limitations" section to `README.md`.
 
-# 0.1.4
+## 0.1.4
 
 * Style and comment adjustments.
 
 * Fix a potential infinite loop in the demo app and add tests for it.
 
-# 0.1.3
+## 0.1.3
 
 * Fixed positioning of text selection handles for `EditableText`-based
   widgets (e.g. `TextField`, `CupertinoTextField`) when used within a
   `VisibilityDetector`.
 
 * Added `VisibilityDetectorController.widgetBoundsFor`.
 
-# 0.1.2
+## 0.1.2
 
 * Compatibility fixes for Flutter 1.3.0.
 
-# 0.1.1
+## 0.1.1
 
 * Added `VisibilityDetectorController.forget`.

packages/visibility_detector/example/lib/main.dart

@@ -74,6 +74,8 @@ class VisibilityDetectorDemo extends StatelessWidget {
   Widget build(BuildContext context) {
     return MaterialApp(
       title: title,
+      scrollBehavior:
+          const MaterialScrollBehavior().copyWith(scrollbars: false),
       theme: ThemeData(primarySwatch: Colors.blue),
       home: VisibilityDetectorDemoPage(key: key, useSlivers: useSlivers),
     );