opt fab location

Signed-off-by: dom <githubaccount56556@proton.me>

lib/pages/common/dyn/common_dyn_controller.dart

@@ -14,6 +14,8 @@ abstract class CommonDynController extends ReplyController<MainListReply> {
   late final horizontalPreview = Pref.horizontalPreview;
   late final List<double> ratio = Pref.dynamicDetailRatio;
 
+  late final showDynActionBar = Pref.showDynActionBar;
+
   @override
   Future<LoadingState<MainListReply>> customGetData() => ReplyGrpc.mainList(
     type: replyType,

lib/pages/common/dyn/common_dyn_page.dart

@@ -9,6 +9,7 @@ import 'package:PiliPlus/grpc/bilibili/main/community/reply/v1.pb.dart'
     show ReplyInfo;
 import 'package:PiliPlus/http/loading_state.dart';
 import 'package:PiliPlus/pages/common/dyn/common_dyn_controller.dart';
+import 'package:PiliPlus/pages/common/fab_mixin.dart';
 import 'package:PiliPlus/pages/video/reply/widgets/reply_item_grpc.dart';
 import 'package:PiliPlus/pages/video/reply_reply/view.dart';
 import 'package:PiliPlus/utils/extension/num_ext.dart';
@@ -22,7 +23,7 @@ import 'package:flutter/material.dart';
 import 'package:get/get.dart';
 
 abstract class CommonDynPageState<T extends StatefulWidget> extends State<T>
-    with SingleTickerProviderStateMixin {
+    with SingleTickerProviderStateMixin, FabMixin {
   CommonDynController get controller;
 
   late final ScrollController scrollController;
@@ -36,26 +37,9 @@ abstract class CommonDynPageState<T extends StatefulWidget> extends State<T>
   late double maxWidth;
   late double maxHeight;
 
-  bool _showFab = true;
-
-  final fabOffset = const Offset(0, 1);
-
-  late final AnimationController _fabAnimationCtr;
-  late final Animation<Offset> fabAnim;
-
   @override
   void initState() {
     super.initState();
-    _fabAnimationCtr = AnimationController(
-      vsync: this,
-      duration: const Duration(milliseconds: 200),
-    )..forward();
-    fabAnim = _fabAnimationCtr.drive(
-      Tween<Offset>(
-        begin: fabOffset,
-        end: Offset.zero,
-      ).chain(CurveTween(curve: Curves.easeInOut)),
-    );
     scrollController = ScrollController()..addListener(listener);
   }
 
@@ -69,20 +53,6 @@ abstract class CommonDynPageState<T extends StatefulWidget> extends State<T>
     }
   }
 
-  void showFab() {
-    if (!_showFab) {
-      _showFab = true;
-      _fabAnimationCtr.forward();
-    }
-  }
-
-  void hideFab() {
-    if (_showFab) {
-      _showFab = false;
-      _fabAnimationCtr.reverse();
-    }
-  }
-
   @override
   void didChangeDependencies() {
     super.didChangeDependencies();
@@ -98,7 +68,6 @@ abstract class CommonDynPageState<T extends StatefulWidget> extends State<T>
     scrollController
       ..removeListener(listener)
       ..dispose();
-    _fabAnimationCtr.dispose();
     super.dispose();
   }
 
@@ -304,6 +273,16 @@ abstract class CommonDynPageState<T extends StatefulWidget> extends State<T>
     ),
   );
 
+  FloatingActionButtonLocation get floatingActionButtonLocation =>
+      controller.showDynActionBar
+      ? const ActionBarLocation()
+      : const NoBottomPaddingFabLocation();
+
+  Widget get fabButton => Padding(
+    padding: .only(bottom: padding.bottom + kFloatingActionButtonMargin),
+    child: replyButton,
+  );
+
   Widget get replyButton => FloatingActionButton(
     heroTag: null,
     onPressed: () {

lib/pages/common/fab_mixin.dart

@@ -0,0 +1,78 @@
+import 'package:flutter/material.dart';
+
+mixin FabMixin<T extends StatefulWidget> on State<T>, TickerProvider {
+  bool _isFabVisible = true;
+  late final AnimationController _fabAnimationCtr;
+  late final Animation<Offset> fabAnimation;
+
+  @override
+  void initState() {
+    super.initState();
+    _fabAnimationCtr = AnimationController(
+      vsync: this,
+      duration: const Duration(milliseconds: 100),
+    );
+    fabAnimation = _fabAnimationCtr.drive(
+      Tween<Offset>(
+        begin: Offset.zero,
+        end: const Offset(0.0, 1.0),
+      ).chain(CurveTween(curve: Curves.easeInOut)),
+    );
+  }
+
+  void showFab() {
+    if (!_isFabVisible) {
+      _isFabVisible = true;
+      _fabAnimationCtr.reverse();
+    }
+  }
+
+  void hideFab() {
+    if (_isFabVisible) {
+      _isFabVisible = false;
+      _fabAnimationCtr.forward();
+    }
+  }
+
+  @override
+  void dispose() {
+    _fabAnimationCtr.dispose();
+    super.dispose();
+  }
+}
+
+mixin _NoRightMarginMixin on StandardFabLocation {
+  @override
+  double getOffsetX(scaffoldGeometry, _) {
+    return scaffoldGeometry.scaffoldSize.width -
+        scaffoldGeometry.minInsets.right -
+        scaffoldGeometry.floatingActionButtonSize.width;
+  }
+}
+
+mixin _NoBottomPaddingMixin on StandardFabLocation {
+  @override
+  double getOffsetY(scaffoldGeometry, _) {
+    return scaffoldGeometry.contentBottom -
+        scaffoldGeometry.floatingActionButtonSize.height;
+  }
+}
+
+class NoRightMarginFabLocation extends StandardFabLocation
+    with FabFloatOffsetY, _NoRightMarginMixin {
+  const NoRightMarginFabLocation();
+}
+
+class NoBottomPaddingFabLocation extends StandardFabLocation
+    with FabEndOffsetX, _NoBottomPaddingMixin {
+  const NoBottomPaddingFabLocation();
+}
+
+class ActionBarLocation extends StandardFabLocation with _NoBottomPaddingMixin {
+  const ActionBarLocation();
+
+  @override
+  double getOffsetX(scaffoldGeometry, _) {
+    return 0.0;
+  }
+}