use predefined constants (#74627)

packages/flutter/lib/src/cupertino/route.dart

@@ -982,7 +982,7 @@ class _CupertinoModalPopupRoute<T> extends PopupRoute<T> {
     );
     _offsetTween = Tween<Offset>(
       begin: const Offset(0.0, 1.0),
-      end: const Offset(0.0, 0.0),
+      end: Offset.zero,
     );
     return _animation!;
   }

packages/flutter/lib/src/cupertino/text_selection_toolbar.dart

@@ -311,7 +311,7 @@ class _RenderCupertinoTextSelectionToolbarShape extends RenderShiftedBox {
 
       _debugPaint ??= Paint()
         ..shader = ui.Gradient.linear(
-          const Offset(0.0, 0.0),
+          Offset.zero,
           const Offset(10.0, 10.0),
           const <Color>[Color(0x00000000), Color(0xFFFF00FF), Color(0xFFFF00FF), Color(0x00000000)],
           const <double>[0.25, 0.25, 0.75, 0.75],

packages/flutter/lib/src/material/autocomplete.dart

@@ -231,7 +231,7 @@ class _AutocompleteOptions<T extends Object> extends StatelessWidget {
         child: Container(
           height: 200.0,
           child: ListView.builder(
-            padding: const EdgeInsets.all(0.0),
+            padding: EdgeInsets.zero,
             itemCount: options.length,
             itemBuilder: (BuildContext context, int index) {
               final T option = options.elementAt(index);

packages/flutter/lib/src/material/button.dart

@@ -66,7 +66,7 @@ class RawMaterialButton extends StatefulWidget {
     this.highlightElevation = 8.0,
     this.disabledElevation = 0.0,
     this.padding = EdgeInsets.zero,
-    this.visualDensity = const VisualDensity(),
+    this.visualDensity = VisualDensity.standard,
     this.constraints = const BoxConstraints(minWidth: 88.0, minHeight: 36.0),
     this.shape = const RoundedRectangleBorder(),
     this.animationDuration = kThemeChangeDuration,

packages/flutter/lib/src/material/date_picker.dart

@@ -1053,9 +1053,9 @@ class _DateRangePickerDialogState extends State<_DateRangePickerDialog> {
           helpText: widget.helpText ?? localizations.dateRangePickerHelpText,
         );
         size = mediaQuery.size;
-        insetPadding = const EdgeInsets.all(0.0);
+        insetPadding = EdgeInsets.zero;
         shape = const RoundedRectangleBorder(
-            borderRadius: BorderRadius.all(Radius.zero)
+            borderRadius: BorderRadius.zero
         );
         elevation = 0;
         break;

packages/flutter/lib/src/material/dialog.dart

@@ -128,7 +128,7 @@ class Dialog extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final DialogTheme dialogTheme = DialogTheme.of(context);
-    final EdgeInsets effectivePadding = MediaQuery.of(context).viewInsets + (insetPadding ?? const EdgeInsets.all(0.0));
+    final EdgeInsets effectivePadding = MediaQuery.of(context).viewInsets + (insetPadding ?? EdgeInsets.zero);
     return AnimatedPadding(
       padding: effectivePadding,
       duration: insetAnimationDuration,

packages/flutter/lib/src/material/input_decorator.dart

@@ -396,7 +396,7 @@ class _HelperErrorState extends State<_HelperError> with SingleTickerProviderSta
         child: FractionalTranslation(
           translation: Tween<Offset>(
             begin: const Offset(0.0, -0.25),
-            end: const Offset(0.0, 0.0),
+            end: Offset.zero,
           ).evaluate(_controller.view),
           child: Text(
             widget.errorText!,
@@ -1284,7 +1284,7 @@ class _RenderDecoration extends RenderBox {
     assert(debugCannotComputeDryLayout(
       reason: 'Layout requires baseline metrics, which are only available after a full layout.',
     ));
-    return const Size(0, 0);
+    return Size.zero;
   }
 
   @override

packages/flutter/lib/src/material/list_tile.dart

@@ -1691,7 +1691,7 @@ class _RenderListTile extends RenderBox {
     assert(debugCannotComputeDryLayout(
       reason: 'Layout requires baseline metrics, which are only available after a full layout.'
     ));
-    return const Size(0, 0);
+    return Size.zero;
   }
 
   // All of the dimensions below were taken from the Material Design spec:

packages/flutter/lib/src/material/reorderable_list.dart

@@ -419,7 +419,7 @@ class _ReorderableListContentState extends State<_ReorderableListContent> {
     // so we wrap the CustomScrollView in the padding for the top, left and right
     // and only add the padding from the bottom to the sliver list (or the equivalent
     // for other axis directions).
-    final EdgeInsets padding = widget.padding ?? const EdgeInsets.all(0);
+    final EdgeInsets padding = widget.padding ?? EdgeInsets.zero;
     late EdgeInsets outerPadding;
     late EdgeInsets listPadding;
     switch (widget.scrollDirection) {

packages/flutter/lib/src/material/tooltip.dart

@@ -228,7 +228,7 @@ class _TooltipState extends State<Tooltip> with SingleTickerProviderStateMixin {
   static const Duration _fadeInDuration = Duration(milliseconds: 150);
   static const Duration _fadeOutDuration = Duration(milliseconds: 75);
   static const Duration _defaultShowDuration = Duration(milliseconds: 1500);
-  static const Duration _defaultWaitDuration = Duration(milliseconds: 0);
+  static const Duration _defaultWaitDuration = Duration.zero;
   static const bool _defaultExcludeFromSemantics = false;
 
   late double height;

packages/flutter/lib/src/rendering/box.dart

@@ -1884,7 +1884,7 @@ abstract class RenderBox extends RenderObject {
         ),
       ]),
     ));
-    return const Size(0, 0);
+    return Size.zero;
   }
 
   static bool _dryLayoutCalculationValid = true;

packages/flutter/lib/src/rendering/debug_overflow_indicator.dart

@@ -100,7 +100,7 @@ mixin DebugOverflowIndicatorMixin on RenderObject {
   );
   static final Paint _indicatorPaint = Paint()
     ..shader = ui.Gradient.linear(
-      const Offset(0.0, 0.0),
+      Offset.zero,
       const Offset(10.0, 10.0),
       <Color>[_black, _yellow, _yellow, _black],
       <double>[0.25, 0.25, 0.75, 0.75],

packages/flutter/lib/src/rendering/editable.dart

@@ -2193,7 +2193,7 @@ class RenderEditable extends RenderBox with RelayoutWhenSystemFontsChangeMixin {
     assert(boundedOffset != null);
     assert(lastTextPosition != null);
     if (state == FloatingCursorDragState.Start) {
-      _relativeOrigin = const Offset(0, 0);
+      _relativeOrigin = Offset.zero;
       _previousOffset = null;
       _resetOriginOnBottom = false;
       _resetOriginOnTop = false;
@@ -2242,7 +2242,7 @@ class RenderEditable extends RenderBox with RelayoutWhenSystemFontsChangeMixin {
   // The relative origin in relation to the distance the user has theoretically
   // dragged the floating cursor offscreen. This value is used to account for the
   // difference in the rendering position and the raw offset value.
-  Offset _relativeOrigin = const Offset(0, 0);
+  Offset _relativeOrigin = Offset.zero;
   Offset? _previousOffset;
   bool _resetOriginOnLeft = false;
   bool _resetOriginOnRight = false;
@@ -2252,7 +2252,7 @@ class RenderEditable extends RenderBox with RelayoutWhenSystemFontsChangeMixin {
 
   /// Returns the position within the text field closest to the raw cursor offset.
   Offset calculateBoundedFloatingCursorOffset(Offset rawCursorOffset) {
-    Offset deltaPosition = const Offset(0, 0);
+    Offset deltaPosition = Offset.zero;
     final double topBound = -floatingCursorAddedMargin.top;
     final double bottomBound = _textPainter.height - preferredLineHeight + floatingCursorAddedMargin.bottom;
     final double leftBound = -floatingCursorAddedMargin.left;

packages/flutter/lib/src/rendering/flex.dart

@@ -677,7 +677,7 @@ class RenderFlex extends RenderBox with ContainerRenderObjectMixin<RenderBox, Fl
       assert(debugCannotComputeDryLayout(
         reason: 'Dry layout cannot be computed for CrossAxisAlignment.baseline, which requires a full layout.'
       ));
-      return const Size(0, 0);
+      return Size.zero;
     }
     FlutterError? constraintsError;
     assert(() {
@@ -689,7 +689,7 @@ class RenderFlex extends RenderBox with ContainerRenderObjectMixin<RenderBox, Fl
     }());
     if (constraintsError != null) {
       assert(debugCannotComputeDryLayout(error: constraintsError));
-      return const Size(0, 0);
+      return Size.zero;
     }
 
     final _LayoutSizes sizes = _computeSizes(

packages/flutter/lib/src/rendering/paragraph.dart

@@ -637,7 +637,7 @@ class RenderParagraph extends RenderBox
       assert(debugCannotComputeDryLayout(
         reason: 'Dry layout not available for alignments that require baseline.',
       ));
-      return const Size(0, 0);
+      return Size.zero;
     }
     _textPainter.setPlaceholderDimensions(_layoutChildren(constraints, dry: true));
     _layoutText(minWidth: constraints.minWidth, maxWidth: constraints.maxWidth);

packages/flutter/lib/src/rendering/proxy_box.dart

@@ -1389,7 +1389,7 @@ abstract class _RenderCustomClip<T> extends RenderProxyBox {
     assert(() {
       _debugPaint ??= Paint()
         ..shader = ui.Gradient.linear(
-          const Offset(0.0, 0.0),
+          Offset.zero,
           const Offset(10.0, 10.0),
           <Color>[const Color(0x00000000), const Color(0xFFFF00FF), const Color(0xFFFF00FF), const Color(0x00000000)],
           <double>[0.25, 0.25, 0.75, 0.75],
@@ -2502,7 +2502,7 @@ class RenderFittedBox extends RenderProxyBox {
         assert(debugCannotComputeDryLayout(
           reason: 'Child provided invalid size of $childSize.',
         ));
-        return const Size(0, 0);
+        return Size.zero;
       }
 
       switch (fit) {

packages/flutter/lib/src/rendering/proxy_sliver.dart

@@ -317,11 +317,7 @@ class RenderSliverOffstage extends RenderProxySliver {
     if (!offstage)
       geometry = child!.geometry;
     else
-      geometry = const SliverGeometry(
-        scrollExtent: 0.0,
-        visible: false,
-        maxPaintExtent: 0.0,
-      );
+      geometry = SliverGeometry.zero;
   }
 
   @override

packages/flutter/lib/src/rendering/shifted_box.dart

@@ -1287,7 +1287,7 @@ class RenderBaseline extends RenderShiftedBox {
       assert(debugCannotComputeDryLayout(
         reason: 'Baseline metrics are only available after a full layout.',
       ));
-      return const Size(0, 0);
+      return Size.zero;
     }
     return constraints.smallest;
   }

packages/flutter/lib/src/rendering/table.dart

@@ -1002,7 +1002,7 @@ class RenderTable extends RenderBox {
   @override
   Size computeDryLayout(BoxConstraints constraints) {
     if (rows * columns == 0) {
-      return constraints.constrain(const Size(0.0, 0.0));
+      return constraints.constrain(Size.zero);
     }
     final List<double> widths = _computeColumnWidths(constraints);
     final double tableWidth = widths.fold(0.0, (double a, double b) => a + b);
@@ -1020,7 +1020,7 @@ class RenderTable extends RenderBox {
               assert(debugCannotComputeDryLayout(
                 reason: 'TableCellVerticalAlignment.baseline requires a full layout for baseline metrics to be available.'
               ));
-              return const Size(0 ,0);
+              return Size.zero;
             case TableCellVerticalAlignment.top:
             case TableCellVerticalAlignment.middle:
             case TableCellVerticalAlignment.bottom:
@@ -1046,7 +1046,7 @@ class RenderTable extends RenderBox {
     if (rows * columns == 0) {
       // TODO(ianh): if columns is zero, this should be zero width
       // TODO(ianh): if columns is not zero, this should be based on the column width specifications
-      size = constraints.constrain(const Size(0.0, 0.0));
+      size = constraints.constrain(Size.zero);
       return;
     }
     final List<double> widths = _computeColumnWidths(constraints);

packages/flutter/lib/src/services/text_input.dart

@@ -1070,7 +1070,7 @@ RawFloatingCursorPoint _toTextPoint(FloatingCursorDragState state, Map<String, d
   assert(encoded['Y'] != null, 'You must provide a value for the vertical location of the floating cursor.');
   final Offset offset = state == FloatingCursorDragState.Update
     ? Offset(encoded['X'] as double, encoded['Y'] as double)
-    : const Offset(0, 0);
+    : Offset.zero;
   return RawFloatingCursorPoint(offset: offset, state: state);
 }
 

packages/flutter/lib/src/widgets/animated_list.dart

@@ -495,7 +495,7 @@ class AnimatedListState extends State<AnimatedList> with TickerProviderStateMixi
       shrinkWrap: widget.shrinkWrap,
       slivers: <Widget>[
         SliverPadding(
-          padding: widget.padding ?? const EdgeInsets.all(0),
+          padding: widget.padding ?? EdgeInsets.zero,
           sliver: SliverAnimatedList(
             key: _sliverAnimatedListKey,
             itemBuilder: widget.itemBuilder,

packages/flutter/lib/src/widgets/layout_builder.dart

@@ -351,7 +351,7 @@ class _RenderLayoutBuilder extends RenderBox with RenderObjectWithChildMixin<Ren
       'Calculating the dry layout would require running the layout callback '
       'speculatively, which might mutate the live render object tree.',
     ));
-    return const Size(0, 0);
+    return Size.zero;
   }
 
   @override

packages/flutter/lib/src/widgets/nested_scroll_view.dart

@@ -1895,7 +1895,7 @@ class RenderSliverOverlapAbsorber extends RenderSliver with RenderObjectWithChil
       'A SliverOverlapAbsorberHandle cannot be passed to multiple RenderSliverOverlapAbsorber objects at the same time.',
     );
     if (child == null) {
-      geometry = const SliverGeometry();
+      geometry = SliverGeometry.zero;
       return;
     }
     child!.layout(constraints, parentUsesSize: true);

packages/flutter/lib/src/widgets/reorderable_list.dart

@@ -336,7 +336,7 @@ class ReorderableListState extends State<ReorderableList> {
       shrinkWrap: widget.shrinkWrap,
       slivers: <Widget>[
         SliverPadding(
-          padding: widget.padding ?? const EdgeInsets.all(0),
+          padding: widget.padding ?? EdgeInsets.zero,
           sliver: SliverReorderableList(
             key: _sliverReorderableListKey,
             itemBuilder: widget.itemBuilder,

packages/flutter/lib/src/widgets/widget_inspector.dart

@@ -2492,7 +2492,7 @@ class _RenderInspectorOverlay extends RenderBox {
 
   @override
   Size computeDryLayout(BoxConstraints constraints) {
-    return constraints.constrain(const Size(double.infinity, double.infinity));
+    return constraints.constrain(Size.infinite);
   }
 
   @override