mirror of
https://github.com/flutter/flutter
synced 2024-08-24 18:36:03 +00:00
Introduce methods for computing the baseline location of a RenderBox without affecting the current layout (#144655)
Extracted from https://github.com/flutter/flutter/pull/138369 Introduces `RenderBox.{compute,get}DryBaseline` for computing the baseline location in `RenderBox.computeDryLayout`.
This commit is contained in:
parent
f704560c0b
commit
98369bdd50
|
@ -1316,7 +1316,10 @@ class _RenderDecoration extends RenderBox with SlottedContainerRenderObjectMixin
|
|||
|
||||
@override
|
||||
double computeDistanceToActualBaseline(TextBaseline baseline) {
|
||||
return _boxParentData(input!).offset.dy + (input?.computeDistanceToActualBaseline(baseline) ?? 0.0);
|
||||
final RenderBox? input = this.input;
|
||||
return input == null
|
||||
? 0.0
|
||||
: _boxParentData(input).offset.dy + (input.computeDistanceToActualBaseline(baseline) ?? 0.0);
|
||||
}
|
||||
|
||||
// Records where the label was painted.
|
||||
|
|
|
@ -1249,10 +1249,12 @@ class _RenderListTile extends RenderBox with SlottedContainerRenderObjectMixin<_
|
|||
}
|
||||
|
||||
@override
|
||||
double computeDistanceToActualBaseline(TextBaseline baseline) {
|
||||
double? computeDistanceToActualBaseline(TextBaseline baseline) {
|
||||
assert(title != null);
|
||||
final BoxParentData parentData = title!.parentData! as BoxParentData;
|
||||
return parentData.offset.dy + title!.getDistanceToActualBaseline(baseline)!;
|
||||
final BaselineOffset offset = BaselineOffset(title!.getDistanceToActualBaseline(baseline))
|
||||
+ parentData.offset.dy;
|
||||
return offset.offset;
|
||||
}
|
||||
|
||||
static double? _boxBaseline(RenderBox box, TextBaseline baseline) {
|
||||
|
|
|
@ -1175,11 +1175,13 @@ class _SelectToggleButtonRenderObject extends RenderShiftedBox {
|
|||
}
|
||||
|
||||
@override
|
||||
double computeDistanceToActualBaseline(TextBaseline baseline) {
|
||||
double? computeDistanceToActualBaseline(TextBaseline baseline) {
|
||||
// The baseline of this widget is the baseline of its child
|
||||
return direction == Axis.horizontal
|
||||
? child!.computeDistanceToActualBaseline(baseline)! + borderSide.width
|
||||
: child!.computeDistanceToActualBaseline(baseline)! + leadingBorderSide.width;
|
||||
final BaselineOffset childOffset = BaselineOffset(child?.computeDistanceToActualBaseline(baseline));
|
||||
return switch (direction) {
|
||||
Axis.horizontal => childOffset + borderSide.width,
|
||||
Axis.vertical => childOffset + leadingBorderSide.width,
|
||||
}.offset;
|
||||
}
|
||||
|
||||
@override
|
||||
|
|
|
@ -192,7 +192,7 @@ class BoxConstraints extends Constraints {
|
|||
}
|
||||
|
||||
/// Returns new box constraints that are smaller by the given edge dimensions.
|
||||
BoxConstraints deflate(EdgeInsets edges) {
|
||||
BoxConstraints deflate(EdgeInsetsGeometry edges) {
|
||||
assert(debugAssertIsValid());
|
||||
final double horizontal = edges.horizontal;
|
||||
final double vertical = edges.vertical;
|
||||
|
@ -940,24 +940,154 @@ class BoxParentData extends ParentData {
|
|||
/// the relevant type arguments.
|
||||
abstract class ContainerBoxParentData<ChildType extends RenderObject> extends BoxParentData with ContainerParentDataMixin<ChildType> { }
|
||||
|
||||
enum _IntrinsicDimension { minWidth, maxWidth, minHeight, maxHeight }
|
||||
/// A wrapper that represents the baseline location of a `RenderBox`.
|
||||
extension type const BaselineOffset(double? offset) {
|
||||
/// A value that indicates that the associated `RenderBox` does not have any
|
||||
/// baselines.
|
||||
///
|
||||
/// [BaselineOffset.noBaseline] is an identity element in most binary
|
||||
/// operations involving two [BaselineOffset]s (such as [minOf]), for render
|
||||
/// objects with no baselines typically do not contribute to the baseline
|
||||
/// offset of their parents.
|
||||
static const BaselineOffset noBaseline = BaselineOffset(null);
|
||||
|
||||
@immutable
|
||||
class _IntrinsicDimensionsCacheEntry {
|
||||
const _IntrinsicDimensionsCacheEntry(this.dimension, this.argument);
|
||||
/// Returns a new baseline location that is `offset` pixels further away from
|
||||
/// the origin than `this`, or unchanged if `this` is [noBaseline].
|
||||
BaselineOffset operator +(double offset) {
|
||||
final double? value = this.offset;
|
||||
return BaselineOffset(value == null ? null : value + offset);
|
||||
}
|
||||
|
||||
final _IntrinsicDimension dimension;
|
||||
final double argument;
|
||||
/// Compares this [BaselineOffset] and `other`, and returns whichever is closer
|
||||
/// to the origin.
|
||||
///
|
||||
/// When both `this` and `other` are [noBaseline], this method returns
|
||||
/// [noBaseline]. When one of them is [noBaseline], this method returns the
|
||||
/// other oprand that's not [noBaseline].
|
||||
BaselineOffset minOf(BaselineOffset other) {
|
||||
return switch ((this, other)) {
|
||||
(final double lhs?, final double rhs?) => lhs >= rhs ? other : this,
|
||||
(final double lhs?, null) => BaselineOffset(lhs),
|
||||
(null, final BaselineOffset rhs) => rhs,
|
||||
};
|
||||
}
|
||||
}
|
||||
|
||||
/// An interface that represents a memoized layout computation run by a [RenderBox].
|
||||
///
|
||||
/// Each subclass is inhabited by a single object. Each object represents the
|
||||
/// signature of a memoized layout computation run by [RenderBox]. For instance,
|
||||
/// the [dryLayout] object of the [_DryLayout] subclass represents the signature
|
||||
/// of the [RenderBox.computeDryLayout] method: it takes a [BoxConstraints] (the
|
||||
/// subclass's `Input` type parameter) and returns a [Size] (the subclass's
|
||||
/// `Output` type parameter).
|
||||
///
|
||||
/// Subclasses do not own their own cache storage. Rather, their [memoize]
|
||||
/// implementation takes a `cacheStorage`. If a prior computation with the same
|
||||
/// input valus has already been memoized in `cacheStorage`, it returns the
|
||||
/// memoized value without running `computer`. Otherwise the method runs the
|
||||
/// `computer` to compute the return value, and caches the result to
|
||||
/// `cacheStorage`.
|
||||
///
|
||||
/// The layout cache storage is typically cleared in `markNeedsLayout`, but is
|
||||
/// usually kept across [RenderObject.layout] calls because the incoming
|
||||
/// [BoxConstraints] is always an input of every layout computation.
|
||||
abstract class _CachedLayoutCalculation<Input extends Object, Output> {
|
||||
static const _DryLayout dryLayout = _DryLayout();
|
||||
static const _Baseline baseline = _Baseline();
|
||||
|
||||
Output memoize(_LayoutCacheStorage cacheStorage, Input input, Output Function(Input) computer);
|
||||
|
||||
// Debug information that will be used to generate the Timeline event for this type of calculation.
|
||||
Map<String, String> debugFillTimelineArguments(Map<String, String> timelineArguments, Input input);
|
||||
String eventLabel(RenderBox renderBox);
|
||||
}
|
||||
|
||||
final class _DryLayout implements _CachedLayoutCalculation<BoxConstraints, Size> {
|
||||
const _DryLayout();
|
||||
|
||||
@override
|
||||
bool operator ==(Object other) {
|
||||
return other is _IntrinsicDimensionsCacheEntry
|
||||
&& other.dimension == dimension
|
||||
&& other.argument == argument;
|
||||
Size memoize(_LayoutCacheStorage cacheStorage, BoxConstraints input, Size Function(BoxConstraints) computer) {
|
||||
return (cacheStorage._cachedDryLayoutSizes ??= <BoxConstraints, Size>{}).putIfAbsent(input, () => computer(input));
|
||||
}
|
||||
|
||||
@override
|
||||
int get hashCode => Object.hash(dimension, argument);
|
||||
Map<String, String> debugFillTimelineArguments(Map<String, String> timelineArguments, BoxConstraints input) {
|
||||
return timelineArguments..['getDryLayout constraints'] = '$input';
|
||||
}
|
||||
|
||||
@override
|
||||
String eventLabel(RenderBox renderBox) => '${renderBox.runtimeType}.getDryLayout';
|
||||
}
|
||||
|
||||
final class _Baseline implements _CachedLayoutCalculation<(BoxConstraints, TextBaseline), BaselineOffset> {
|
||||
const _Baseline();
|
||||
|
||||
@override
|
||||
BaselineOffset memoize(_LayoutCacheStorage cacheStorage, (BoxConstraints, TextBaseline) input, BaselineOffset Function((BoxConstraints, TextBaseline)) computer) {
|
||||
final Map<BoxConstraints, BaselineOffset> cache = switch (input.$2) {
|
||||
TextBaseline.alphabetic => cacheStorage._cachedAlphabeticBaseline ??= <BoxConstraints, BaselineOffset>{},
|
||||
TextBaseline.ideographic => cacheStorage._cachedIdeoBaseline ??= <BoxConstraints, BaselineOffset>{},
|
||||
};
|
||||
BaselineOffset ifAbsent() => computer(input);
|
||||
return cache.putIfAbsent(input.$1, ifAbsent);
|
||||
}
|
||||
|
||||
@override
|
||||
Map<String, String> debugFillTimelineArguments(Map<String, String> timelineArguments, (BoxConstraints, TextBaseline) input) {
|
||||
return timelineArguments
|
||||
..['baseline type'] = '${input.$2}'
|
||||
..['constraints'] = '${input.$1}';
|
||||
}
|
||||
|
||||
@override
|
||||
String eventLabel(RenderBox renderBox) => '${renderBox.runtimeType}.getDryBaseline';
|
||||
}
|
||||
|
||||
// Intrinsic dimension calculation that computes the intrinsic width given the
|
||||
// max height, or the intrinsic height given the max width.
|
||||
enum _IntrinsicDimension implements _CachedLayoutCalculation<double, double> {
|
||||
minWidth, maxWidth, minHeight, maxHeight;
|
||||
|
||||
@override
|
||||
double memoize(_LayoutCacheStorage cacheStorage, double input, double Function(double) computer) {
|
||||
return (cacheStorage._cachedIntrinsicDimensions ??= <(_IntrinsicDimension, double), double>{})
|
||||
.putIfAbsent((this, input), () => computer(input));
|
||||
}
|
||||
|
||||
@override
|
||||
Map<String, String> debugFillTimelineArguments(Map<String, String> timelineArguments, double input) {
|
||||
return timelineArguments
|
||||
..['intrinsics dimension'] = name
|
||||
..['intrinsics argument'] = '$input';
|
||||
}
|
||||
|
||||
@override
|
||||
String eventLabel(RenderBox renderBox) => '${renderBox.runtimeType} intrinsics';
|
||||
}
|
||||
|
||||
final class _LayoutCacheStorage {
|
||||
Map<(_IntrinsicDimension, double), double>? _cachedIntrinsicDimensions;
|
||||
Map<BoxConstraints, Size>? _cachedDryLayoutSizes;
|
||||
Map<BoxConstraints, BaselineOffset>? _cachedAlphabeticBaseline;
|
||||
Map<BoxConstraints, BaselineOffset>? _cachedIdeoBaseline;
|
||||
|
||||
// Returns a boolean indicating whether the cache storage has cached
|
||||
// intrinsics / dry layout data in it.
|
||||
bool clear() {
|
||||
final bool hasCache = (_cachedDryLayoutSizes?.isNotEmpty ?? false)
|
||||
|| (_cachedIntrinsicDimensions?.isNotEmpty ?? false)
|
||||
|| (_cachedAlphabeticBaseline?.isNotEmpty ?? false)
|
||||
|| (_cachedIdeoBaseline?.isNotEmpty ?? false);
|
||||
|
||||
if (hasCache) {
|
||||
_cachedDryLayoutSizes?.clear();
|
||||
_cachedIntrinsicDimensions?.clear();
|
||||
_cachedAlphabeticBaseline?.clear();
|
||||
_cachedIdeoBaseline?.clear();
|
||||
}
|
||||
return hasCache;
|
||||
}
|
||||
}
|
||||
|
||||
/// A render object in a 2D Cartesian coordinate system.
|
||||
|
@ -1381,55 +1511,52 @@ abstract class RenderBox extends RenderObject {
|
|||
}
|
||||
}
|
||||
|
||||
Map<_IntrinsicDimensionsCacheEntry, double>? _cachedIntrinsicDimensions;
|
||||
static int _debugIntrinsicsDepth = 0;
|
||||
final _LayoutCacheStorage _layoutCacheStorage = _LayoutCacheStorage();
|
||||
|
||||
double _computeIntrinsicDimension(_IntrinsicDimension dimension, double argument, double Function(double argument) computer) {
|
||||
static int _debugIntrinsicsDepth = 0;
|
||||
Output _computeIntrinsics<Input extends Object, Output>(
|
||||
_CachedLayoutCalculation<Input, Output> type,
|
||||
Input input,
|
||||
Output Function(Input) computer,
|
||||
) {
|
||||
assert(RenderObject.debugCheckingIntrinsics || !debugDoingThisResize); // performResize should not depend on anything except the incoming constraints
|
||||
bool shouldCache = true;
|
||||
assert(() {
|
||||
// we don't want the checked-mode intrinsic tests to affect
|
||||
// who gets marked dirty, etc.
|
||||
if (RenderObject.debugCheckingIntrinsics) {
|
||||
shouldCache = false;
|
||||
}
|
||||
shouldCache = !RenderObject.debugCheckingIntrinsics;
|
||||
return true;
|
||||
}());
|
||||
if (shouldCache) {
|
||||
Map<String, String>? debugTimelineArguments;
|
||||
assert(() {
|
||||
if (debugEnhanceLayoutTimelineArguments) {
|
||||
debugTimelineArguments = toDiagnosticsNode().toTimelineArguments();
|
||||
} else {
|
||||
debugTimelineArguments = <String, String>{};
|
||||
}
|
||||
debugTimelineArguments!['intrinsics dimension'] = dimension.name;
|
||||
debugTimelineArguments!['intrinsics argument'] = '$argument';
|
||||
return true;
|
||||
}());
|
||||
if (!kReleaseMode) {
|
||||
if (debugProfileLayoutsEnabled || _debugIntrinsicsDepth == 0) {
|
||||
FlutterTimeline.startSync(
|
||||
'$runtimeType intrinsics',
|
||||
arguments: debugTimelineArguments,
|
||||
);
|
||||
}
|
||||
_debugIntrinsicsDepth += 1;
|
||||
return shouldCache ? _computeWithTimeline(type, input, computer) : computer(input);
|
||||
}
|
||||
|
||||
Output _computeWithTimeline<Input extends Object, Output>(
|
||||
_CachedLayoutCalculation<Input, Output> type,
|
||||
Input input,
|
||||
Output Function(Input) computer,
|
||||
) {
|
||||
Map<String, String>? debugTimelineArguments;
|
||||
assert(() {
|
||||
final Map<String, String> arguments = debugEnhanceLayoutTimelineArguments
|
||||
? toDiagnosticsNode().toTimelineArguments()!
|
||||
: <String, String>{};
|
||||
debugTimelineArguments = type.debugFillTimelineArguments(arguments, input);
|
||||
return true;
|
||||
}());
|
||||
if (!kReleaseMode) {
|
||||
if (debugProfileLayoutsEnabled || _debugIntrinsicsDepth == 0) {
|
||||
FlutterTimeline.startSync(type.eventLabel(this), arguments: debugTimelineArguments);
|
||||
}
|
||||
_cachedIntrinsicDimensions ??= <_IntrinsicDimensionsCacheEntry, double>{};
|
||||
final double result = _cachedIntrinsicDimensions!.putIfAbsent(
|
||||
_IntrinsicDimensionsCacheEntry(dimension, argument),
|
||||
() => computer(argument),
|
||||
);
|
||||
if (!kReleaseMode) {
|
||||
_debugIntrinsicsDepth -= 1;
|
||||
if (debugProfileLayoutsEnabled || _debugIntrinsicsDepth == 0) {
|
||||
FlutterTimeline.finishSync();
|
||||
}
|
||||
}
|
||||
return result;
|
||||
_debugIntrinsicsDepth += 1;
|
||||
}
|
||||
return computer(argument);
|
||||
final Output result = type.memoize(_layoutCacheStorage, input, computer);
|
||||
if (!kReleaseMode) {
|
||||
_debugIntrinsicsDepth -= 1;
|
||||
if (debugProfileLayoutsEnabled || _debugIntrinsicsDepth == 0) {
|
||||
FlutterTimeline.finishSync();
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
/// Returns the minimum width that this box could be without failing to
|
||||
|
@ -1463,7 +1590,7 @@ abstract class RenderBox extends RenderObject {
|
|||
}
|
||||
return true;
|
||||
}());
|
||||
return _computeIntrinsicDimension(_IntrinsicDimension.minWidth, height, computeMinIntrinsicWidth);
|
||||
return _computeIntrinsics(_IntrinsicDimension.minWidth, height, computeMinIntrinsicWidth);
|
||||
}
|
||||
|
||||
/// Computes the value returned by [getMinIntrinsicWidth]. Do not call this
|
||||
|
@ -1605,7 +1732,7 @@ abstract class RenderBox extends RenderObject {
|
|||
}
|
||||
return true;
|
||||
}());
|
||||
return _computeIntrinsicDimension(_IntrinsicDimension.maxWidth, height, computeMaxIntrinsicWidth);
|
||||
return _computeIntrinsics(_IntrinsicDimension.maxWidth, height, computeMaxIntrinsicWidth);
|
||||
}
|
||||
|
||||
/// Computes the value returned by [getMaxIntrinsicWidth]. Do not call this
|
||||
|
@ -1681,7 +1808,7 @@ abstract class RenderBox extends RenderObject {
|
|||
}
|
||||
return true;
|
||||
}());
|
||||
return _computeIntrinsicDimension(_IntrinsicDimension.minHeight, width, computeMinIntrinsicHeight);
|
||||
return _computeIntrinsics(_IntrinsicDimension.minHeight, width, computeMinIntrinsicHeight);
|
||||
}
|
||||
|
||||
/// Computes the value returned by [getMinIntrinsicHeight]. Do not call this
|
||||
|
@ -1756,7 +1883,7 @@ abstract class RenderBox extends RenderObject {
|
|||
}
|
||||
return true;
|
||||
}());
|
||||
return _computeIntrinsicDimension(_IntrinsicDimension.maxHeight, width, computeMaxIntrinsicHeight);
|
||||
return _computeIntrinsics(_IntrinsicDimension.maxHeight, width, computeMaxIntrinsicHeight);
|
||||
}
|
||||
|
||||
/// Computes the value returned by [getMaxIntrinsicHeight]. Do not call this
|
||||
|
@ -1800,9 +1927,6 @@ abstract class RenderBox extends RenderObject {
|
|||
return 0.0;
|
||||
}
|
||||
|
||||
Map<BoxConstraints, Size>? _cachedDryLayoutSizes;
|
||||
bool _computingThisDryLayout = false;
|
||||
|
||||
/// Returns the [Size] that this [RenderBox] would like to be given the
|
||||
/// provided [BoxConstraints].
|
||||
///
|
||||
|
@ -1822,49 +1946,11 @@ abstract class RenderBox extends RenderObject {
|
|||
///
|
||||
/// Do not override this method. Instead, implement [computeDryLayout].
|
||||
@mustCallSuper
|
||||
Size getDryLayout(BoxConstraints constraints) {
|
||||
bool shouldCache = true;
|
||||
assert(() {
|
||||
// we don't want the checked-mode intrinsic tests to affect
|
||||
// who gets marked dirty, etc.
|
||||
if (RenderObject.debugCheckingIntrinsics) {
|
||||
shouldCache = false;
|
||||
}
|
||||
return true;
|
||||
}());
|
||||
if (shouldCache) {
|
||||
Map<String, String>? debugTimelineArguments;
|
||||
assert(() {
|
||||
if (debugEnhanceLayoutTimelineArguments) {
|
||||
debugTimelineArguments = toDiagnosticsNode().toTimelineArguments();
|
||||
} else {
|
||||
debugTimelineArguments = <String, String>{};
|
||||
}
|
||||
debugTimelineArguments!['getDryLayout constraints'] = '$constraints';
|
||||
return true;
|
||||
}());
|
||||
if (!kReleaseMode) {
|
||||
if (debugProfileLayoutsEnabled || _debugIntrinsicsDepth == 0) {
|
||||
FlutterTimeline.startSync(
|
||||
'$runtimeType.getDryLayout',
|
||||
arguments: debugTimelineArguments,
|
||||
);
|
||||
}
|
||||
_debugIntrinsicsDepth += 1;
|
||||
}
|
||||
_cachedDryLayoutSizes ??= <BoxConstraints, Size>{};
|
||||
final Size result = _cachedDryLayoutSizes!.putIfAbsent(constraints, () => _computeDryLayout(constraints));
|
||||
if (!kReleaseMode) {
|
||||
_debugIntrinsicsDepth -= 1;
|
||||
if (debugProfileLayoutsEnabled || _debugIntrinsicsDepth == 0) {
|
||||
FlutterTimeline.finishSync();
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
return _computeDryLayout(constraints);
|
||||
Size getDryLayout(covariant BoxConstraints constraints) {
|
||||
return _computeIntrinsics(_CachedLayoutCalculation.dryLayout, constraints, _computeDryLayout);
|
||||
}
|
||||
|
||||
bool _computingThisDryLayout = false;
|
||||
Size _computeDryLayout(BoxConstraints constraints) {
|
||||
assert(() {
|
||||
assert(!_computingThisDryLayout);
|
||||
|
@ -1902,11 +1988,8 @@ abstract class RenderBox extends RenderObject {
|
|||
/// ### When the size cannot be known
|
||||
///
|
||||
/// There are cases where render objects do not have an efficient way to
|
||||
/// compute their size without doing a full layout. For example, the size
|
||||
/// may depend on the baseline of a child (which is not available without
|
||||
/// doing a full layout), it may be computed by a callback about which the
|
||||
/// render object cannot reason, or the layout is so complex that it
|
||||
/// is impractical to calculate the size in an efficient way.
|
||||
/// compute their size. For example, the size may computed by a callback about
|
||||
/// which the render object cannot reason.
|
||||
///
|
||||
/// In such cases, it may be impossible (or at least impractical) to actually
|
||||
/// return a valid answer. In such cases, the function should call
|
||||
|
@ -1926,10 +2009,108 @@ abstract class RenderBox extends RenderObject {
|
|||
return Size.zero;
|
||||
}
|
||||
|
||||
static bool _dryLayoutCalculationValid = true;
|
||||
/// Returns the distance from the top of the box to the first baseline of the
|
||||
/// box's contents for the given `constraints`, or `null` if this [RenderBox]
|
||||
/// does not have any baselines.
|
||||
///
|
||||
/// This method calls [computeDryBaseline] under the hood and caches the result.
|
||||
/// [RenderBox] subclasses typically don't overridden [getDryBaseline]. Instead,
|
||||
/// consider overriding [computeDryBaseline] such that it returns a baseline
|
||||
/// location that is consistent with [getDistanceToActualBaseline]. See the
|
||||
/// documentation for the [computeDryBaseline] method for more details.
|
||||
///
|
||||
/// This method is usually called by the [computeDryBaseline] or the
|
||||
/// [computeDryLayout] implementation of a parent [RenderBox] to get the
|
||||
/// baseline location of a [RenderBox] child. Unlike [getDistanceToBaseline],
|
||||
/// this method takes a [BoxConstraints] as an argument and computes the
|
||||
/// baseline location as if the [RenderBox] was laid out by the parent using
|
||||
/// that [BoxConstraints].
|
||||
///
|
||||
/// The "dry" in the method name means this method, like [getDryLayout], has
|
||||
/// no observable side effects when called, as opposed to "wet" layout methods
|
||||
/// such as [performLayout] (which changes this [RenderBox]'s [size], and the
|
||||
/// offsets of its children if any). Since this method does not depend on the
|
||||
/// current layout, unlike [getDistanceToBaseline], it's ok to call this method
|
||||
/// when this [RenderBox]'s layout is outdated.
|
||||
///
|
||||
/// Similar to the intrinsic width/height and [getDryLayout], calling this
|
||||
/// function in [performLayout] is expensive, as it can result in O(N^2) layout
|
||||
/// performance, where N is the number of render objects in the render subtree.
|
||||
/// Typically this method should be only called by the parent [RenderBox]'s
|
||||
/// [computeDryBaseline] or [computeDryLayout] implementation.
|
||||
double? getDryBaseline(covariant BoxConstraints constraints, TextBaseline baseline) {
|
||||
final double? baselineOffset = _computeIntrinsics(_CachedLayoutCalculation.baseline, (constraints, baseline), _computeDryBaseline).offset;
|
||||
// This assert makes sure computeDryBaseline always gets called in debug mode,
|
||||
// in case the computeDryBaseline implementation invokes debugCannotComputeDryLayout.
|
||||
assert(baselineOffset == computeDryBaseline(constraints, baseline));
|
||||
return baselineOffset;
|
||||
}
|
||||
|
||||
/// Called from [computeDryLayout] within an assert if the given [RenderBox]
|
||||
/// subclass does not support calculating a dry layout.
|
||||
bool _computingThisDryBaseline = false;
|
||||
BaselineOffset _computeDryBaseline((BoxConstraints, TextBaseline) pair) {
|
||||
assert(() {
|
||||
assert(!_computingThisDryBaseline);
|
||||
_computingThisDryBaseline = true;
|
||||
return true;
|
||||
}());
|
||||
final BaselineOffset result = BaselineOffset(computeDryBaseline(pair.$1, pair.$2));
|
||||
assert(() {
|
||||
assert(_computingThisDryBaseline);
|
||||
_computingThisDryBaseline = false;
|
||||
return true;
|
||||
}());
|
||||
return result;
|
||||
}
|
||||
|
||||
/// Computes the value returned by [getDryBaseline].
|
||||
///
|
||||
/// This method is for overriding only and shouldn't be called directly. To
|
||||
/// get this [RenderBox]'s speculative baseline location for the given
|
||||
/// `constraints`, call [getDryBaseline] instead.
|
||||
///
|
||||
/// The "dry" in the method name means the implementation must not produce
|
||||
/// observable side effects when called. For example, it must not change the
|
||||
/// [size] of the [RenderBox], or its children's paint offsets, otherwise that
|
||||
/// would results in UI changes when [paint] is called, or hit-testing behavior
|
||||
/// changes when [hitTest] is called. Moreover, accessing the current layout
|
||||
/// of this [RenderBox] or child [RenderBox]es (including accessing [size], or
|
||||
/// `child.size`) usually indicates a bug in the implementaion, as the current
|
||||
/// layout is typically calculated using a set of [BoxConstraints] that's
|
||||
/// different from the `constraints` given as the first parameter. To get the
|
||||
/// size of this [RenderBox] or a child [RenderBox] in this method's
|
||||
/// implementatin, use the [getDryLayout] method instead.
|
||||
///
|
||||
/// The implementation must return a value that represents the distance from
|
||||
/// the top of the box to the first baseline of the box's contents, for the
|
||||
/// given `constraints`, or `null` if the [RenderBox] has no baselines. It's
|
||||
/// the same exact value [RenderBox.computeDistanceToActualBaseline] would
|
||||
/// return, when this [RenderBox] was laid out at `constraints` in the same
|
||||
/// exact state.
|
||||
///
|
||||
/// Not all [RenderBox]es support dry baseline computation. For example, to
|
||||
/// compute the dry baseline of a [LayoutBuilder], its `builder` may have to
|
||||
/// be called with different constraints, which may have side effects such as
|
||||
/// updating the widget tree, violating the "dry" contract. In such cases the
|
||||
/// [RenderBox] must call [debugCannotComputeDryLayout] in an assert, and
|
||||
/// return a dummy baseline offset value (such as `null`).
|
||||
@protected
|
||||
double? computeDryBaseline(covariant BoxConstraints constraints, TextBaseline baseline) {
|
||||
assert(debugCannotComputeDryLayout(
|
||||
error: FlutterError.fromParts(<DiagnosticsNode>[
|
||||
ErrorSummary('The ${objectRuntimeType(this, 'RenderBox')} class does not implement "computeDryBaseline".'),
|
||||
ErrorHint(
|
||||
'If you are not writing your own RenderBox subclass, then this is not\n'
|
||||
'your fault. Contact support: https://github.com/flutter/flutter/issues/new?template=2_bug.yml',
|
||||
),
|
||||
]),
|
||||
));
|
||||
return null;
|
||||
}
|
||||
|
||||
static bool _debugDryLayoutCalculationValid = true;
|
||||
|
||||
/// Called from [computeDryLayout] or [computeDryBaseline] within an assert if
|
||||
/// the given [RenderBox] subclass does not support calculating a dry layout.
|
||||
///
|
||||
/// When asserts are enabled and [debugCheckingIntrinsics] is not true, this
|
||||
/// method will either throw the provided [FlutterError] or it will create and
|
||||
|
@ -1947,7 +2128,7 @@ abstract class RenderBox extends RenderObject {
|
|||
assert(() {
|
||||
if (!RenderObject.debugCheckingIntrinsics) {
|
||||
if (reason != null) {
|
||||
assert(error ==null);
|
||||
assert(error == null);
|
||||
throw FlutterError.fromParts(<DiagnosticsNode>[
|
||||
ErrorSummary('The ${objectRuntimeType(this, 'RenderBox')} class does not support dry layout.'),
|
||||
if (reason.isNotEmpty) ErrorDescription(reason),
|
||||
|
@ -1956,7 +2137,7 @@ abstract class RenderBox extends RenderObject {
|
|||
assert(error != null);
|
||||
throw error!;
|
||||
}
|
||||
_dryLayoutCalculationValid = false;
|
||||
_debugDryLayoutCalculationValid = false;
|
||||
return true;
|
||||
}());
|
||||
return true;
|
||||
|
@ -1981,19 +2162,33 @@ abstract class RenderBox extends RenderObject {
|
|||
final Size? size = _size;
|
||||
if (size is _DebugSize) {
|
||||
assert(size._owner == this);
|
||||
if (RenderObject.debugActiveLayout != null &&
|
||||
!RenderObject.debugActiveLayout!.debugDoingThisLayoutWithCallback) {
|
||||
assert(
|
||||
debugDoingThisResize || debugDoingThisLayout || _computingThisDryLayout ||
|
||||
(RenderObject.debugActiveLayout == parent && size._canBeUsedByParent),
|
||||
'RenderBox.size accessed beyond the scope of resize, layout, or '
|
||||
'permitted parent access. RenderBox can always access its own size, '
|
||||
'otherwise, the only object that is allowed to read RenderBox.size '
|
||||
'is its parent, if they have said they will. If you hit this assert '
|
||||
'trying to access a child\'s size, pass "parentUsesSize: true" to '
|
||||
"that child's layout().",
|
||||
);
|
||||
}
|
||||
final RenderObject? parent = this.parent;
|
||||
// Whether the size getter is accessed during layout (but not in a
|
||||
// layout callback).
|
||||
final bool doingRegularLayout = !(RenderObject.debugActiveLayout?.debugDoingThisLayoutWithCallback ?? true);
|
||||
final bool sizeAccessAllowed = !doingRegularLayout
|
||||
|| debugDoingThisResize
|
||||
|| debugDoingThisLayout
|
||||
|| _computingThisDryLayout
|
||||
|| RenderObject.debugActiveLayout == parent && size._canBeUsedByParent;
|
||||
assert(sizeAccessAllowed,
|
||||
'RenderBox.size accessed beyond the scope of resize, layout, or '
|
||||
'permitted parent access. RenderBox can always access its own size, '
|
||||
'otherwise, the only object that is allowed to read RenderBox.size '
|
||||
'is its parent, if they have said they will. It you hit this assert '
|
||||
'trying to access a child\'s size, pass "parentUsesSize: true" to '
|
||||
"that child's layout() in ${objectRuntimeType(this, 'RenderBox')}.performLayout.",
|
||||
);
|
||||
final RenderBox? renderBoxDoingDryBaseline = _computingThisDryBaseline
|
||||
? this
|
||||
: (parent is RenderBox && parent._computingThisDryBaseline ? parent : null);
|
||||
assert(renderBoxDoingDryBaseline == null,
|
||||
'RenderBox.size accessed in '
|
||||
'${objectRuntimeType(renderBoxDoingDryBaseline, 'RenderBox')}.computeDryBaseline.'
|
||||
'The computeDryBaseline method must not access '
|
||||
'${renderBoxDoingDryBaseline == this ? "the RenderBox's own size" : "the size of its child"},'
|
||||
"because it's established in peformLayout or peformResize using different BoxConstraints."
|
||||
);
|
||||
assert(size == _size);
|
||||
}
|
||||
return true;
|
||||
|
@ -2122,7 +2317,6 @@ abstract class RenderBox extends RenderObject {
|
|||
size = size; // ignore: no_self_assignments
|
||||
}
|
||||
|
||||
Map<TextBaseline, double?>? _cachedBaselines;
|
||||
static bool _debugDoingBaseline = false;
|
||||
static bool _debugSetDoingBaseline(bool value) {
|
||||
_debugDoingBaseline = value;
|
||||
|
@ -2145,19 +2339,19 @@ abstract class RenderBox extends RenderObject {
|
|||
///
|
||||
/// When implementing a [RenderBox] subclass, to override the baseline
|
||||
/// computation, override [computeDistanceToActualBaseline].
|
||||
///
|
||||
/// See also:
|
||||
///
|
||||
/// * [getDryBaseline], which returns the baseline location of this
|
||||
/// [RenderBox] at a certain [BoxConstraints].
|
||||
double? getDistanceToBaseline(TextBaseline baseline, { bool onlyReal = false }) {
|
||||
assert(!_debugDoingBaseline, 'Please see the documentation for computeDistanceToActualBaseline for the required calling conventions of this method.');
|
||||
assert(!debugNeedsLayout);
|
||||
assert(() {
|
||||
if (owner!.debugDoingLayout) {
|
||||
return (RenderObject.debugActiveLayout == parent) && parent!.debugDoingThisLayout;
|
||||
}
|
||||
if (owner!.debugDoingPaint) {
|
||||
return ((RenderObject.debugActivePaint == parent) && parent!.debugDoingThisPaint) ||
|
||||
((RenderObject.debugActivePaint == this) && debugDoingThisPaint);
|
||||
}
|
||||
return false;
|
||||
}());
|
||||
assert(!debugNeedsLayout || RenderObject.debugCheckingIntrinsics);
|
||||
assert(RenderObject.debugCheckingIntrinsics || switch (owner!) {
|
||||
PipelineOwner(debugDoingLayout: true) => RenderObject.debugActiveLayout == parent && parent!.debugDoingThisLayout,
|
||||
PipelineOwner(debugDoingPaint: true) => RenderObject.debugActivePaint == parent && parent!.debugDoingThisPaint || (RenderObject.debugActivePaint == this && debugDoingThisPaint),
|
||||
PipelineOwner() => false,
|
||||
});
|
||||
assert(_debugSetDoingBaseline(true));
|
||||
final double? result;
|
||||
try {
|
||||
|
@ -2180,8 +2374,11 @@ abstract class RenderBox extends RenderObject {
|
|||
@mustCallSuper
|
||||
double? getDistanceToActualBaseline(TextBaseline baseline) {
|
||||
assert(_debugDoingBaseline, 'Please see the documentation for computeDistanceToActualBaseline for the required calling conventions of this method.');
|
||||
_cachedBaselines ??= <TextBaseline, double?>{};
|
||||
return _cachedBaselines!.putIfAbsent(baseline, () => computeDistanceToActualBaseline(baseline));
|
||||
return _computeIntrinsics(
|
||||
_CachedLayoutCalculation.baseline,
|
||||
(constraints, baseline),
|
||||
((BoxConstraints, TextBaseline) pair) => BaselineOffset(computeDistanceToActualBaseline(pair.$2)),
|
||||
).offset;
|
||||
}
|
||||
|
||||
/// Returns the distance from the y-coordinate of the position of the box to
|
||||
|
@ -2331,7 +2528,7 @@ abstract class RenderBox extends RenderObject {
|
|||
}
|
||||
|
||||
// Checking that getDryLayout computes the same size.
|
||||
_dryLayoutCalculationValid = true;
|
||||
_debugDryLayoutCalculationValid = true;
|
||||
RenderObject.debugCheckingIntrinsics = true;
|
||||
final Size dryLayoutSize;
|
||||
try {
|
||||
|
@ -2339,7 +2536,7 @@ abstract class RenderBox extends RenderObject {
|
|||
} finally {
|
||||
RenderObject.debugCheckingIntrinsics = false;
|
||||
}
|
||||
if (_dryLayoutCalculationValid && dryLayoutSize != size) {
|
||||
if (_debugDryLayoutCalculationValid && dryLayoutSize != size) {
|
||||
throw FlutterError.fromParts(<DiagnosticsNode>[
|
||||
ErrorSummary('The size given to the ${objectRuntimeType(this, 'RenderBox')} class differs from the size computed by computeDryLayout.'),
|
||||
ErrorDescription(
|
||||
|
@ -2360,42 +2557,99 @@ abstract class RenderBox extends RenderObject {
|
|||
}());
|
||||
}
|
||||
|
||||
bool _clearCachedData() {
|
||||
if ((_cachedBaselines != null && _cachedBaselines!.isNotEmpty) ||
|
||||
(_cachedIntrinsicDimensions != null && _cachedIntrinsicDimensions!.isNotEmpty) ||
|
||||
(_cachedDryLayoutSizes != null && _cachedDryLayoutSizes!.isNotEmpty)) {
|
||||
// If we have cached data, then someone must have used our data.
|
||||
// Since the parent will shortly be marked dirty, we can forget that they
|
||||
// used the baseline and/or intrinsic dimensions. If they use them again,
|
||||
// then we'll fill the cache again, and if we get dirty again, we'll
|
||||
// notify them again.
|
||||
_cachedBaselines?.clear();
|
||||
_cachedIntrinsicDimensions?.clear();
|
||||
_cachedDryLayoutSizes?.clear();
|
||||
void _debugVerifyDryBaselines() {
|
||||
assert(() {
|
||||
final List<DiagnosticsNode> messages = <DiagnosticsNode>[
|
||||
ErrorDescription(
|
||||
'The constraints used were $constraints.',
|
||||
),
|
||||
ErrorHint(
|
||||
'If you are not writing your own RenderBox subclass, then this is not\n'
|
||||
'your fault. Contact support: https://github.com/flutter/flutter/issues/new?template=2_bug.yml',
|
||||
)
|
||||
];
|
||||
|
||||
for (final TextBaseline baseline in TextBaseline.values) {
|
||||
assert(!RenderObject.debugCheckingIntrinsics);
|
||||
RenderObject.debugCheckingIntrinsics = true;
|
||||
_debugDryLayoutCalculationValid = true;
|
||||
final double? dryBaseline;
|
||||
final double? realBaseline;
|
||||
try {
|
||||
dryBaseline = getDryBaseline(constraints, baseline);
|
||||
realBaseline = getDistanceToBaseline(baseline, onlyReal: true);
|
||||
} finally {
|
||||
RenderObject.debugCheckingIntrinsics = false;
|
||||
}
|
||||
assert(!RenderObject.debugCheckingIntrinsics);
|
||||
if (!_debugDryLayoutCalculationValid || dryBaseline == realBaseline) {
|
||||
continue;
|
||||
}
|
||||
if ((dryBaseline == null) != (realBaseline == null)) {
|
||||
final (String methodReturnedNull, String methodReturnedNonNull) = dryBaseline == null
|
||||
? ('computeDryBaseline', 'computeDistanceToActualBaseline')
|
||||
: ('computeDistanceToActualBaseline', 'computeDryBaseline');
|
||||
throw FlutterError.fromParts(<DiagnosticsNode>[
|
||||
ErrorSummary(
|
||||
'The $baseline location returned by ${objectRuntimeType(this, 'RenderBox')}.computeDistanceToActualBaseline '
|
||||
'differs from the baseline location computed by computeDryBaseline.'
|
||||
),
|
||||
ErrorDescription(
|
||||
'The $methodReturnedNull method returned null while the $methodReturnedNonNull returned a non-null $baseline of ${dryBaseline ?? realBaseline}. '
|
||||
'Did you forget to implement $methodReturnedNull for ${objectRuntimeType(this, 'RenderBox')}?'
|
||||
),
|
||||
...messages,
|
||||
]);
|
||||
} else {
|
||||
throw FlutterError.fromParts(<DiagnosticsNode>[
|
||||
ErrorSummary(
|
||||
'The $baseline location returned by ${objectRuntimeType(this, 'RenderBox')}.computeDistanceToActualBaseline '
|
||||
'differs from the baseline location computed by computeDryBaseline.'
|
||||
),
|
||||
DiagnosticsProperty<RenderObject>(
|
||||
'The RenderBox was',
|
||||
this,
|
||||
),
|
||||
ErrorDescription(
|
||||
'The computeDryBaseline method returned $dryBaseline,\n'
|
||||
'while the computeDistanceToActualBaseline method returned $realBaseline.\n'
|
||||
'Consider checking the implementations of the following methods on the ${objectRuntimeType(this, 'RenderBox')} class and make sure they are consistent:\n'
|
||||
' * computeDistanceToActualBaseline\n'
|
||||
' * computeDryBaseline\n'
|
||||
' * performLayout\n'
|
||||
),
|
||||
...messages,
|
||||
]);
|
||||
}
|
||||
}
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}());
|
||||
}
|
||||
|
||||
@override
|
||||
void markNeedsLayout() {
|
||||
if (_clearCachedData() && parent is RenderObject) {
|
||||
// If `_layoutCacheStorage.clear` returns true, then this [RenderBox]'s layout
|
||||
// is used by the parent's layout algorithm (it's possible that the parent
|
||||
// only used the intrinsics for paint, but there's no good way to detect that
|
||||
// so we conservatively assume it's a layout dependency).
|
||||
//
|
||||
// A render object's performLayout implementation may depend on the baseline
|
||||
// location or the intrinsic dimensions of a descendant, even when there are
|
||||
// relayout boundaries between them. The `_layoutCacheStorage` being non-empty
|
||||
// indicates that the parent depended on this RenderBox's baseline location,
|
||||
// or intrinsic sizes, and thus may need relayout, regardless of relayout
|
||||
// boundaries.
|
||||
//
|
||||
// Some calculations may fail (dry baseline, for example). The layout
|
||||
// dependency is still established, but only from the RenderBox that failed
|
||||
// to compute the dry baseline to the ancestor that queried the dry baseline.
|
||||
if (_layoutCacheStorage.clear() && parent != null) {
|
||||
markParentNeedsLayout();
|
||||
return;
|
||||
}
|
||||
super.markNeedsLayout();
|
||||
}
|
||||
|
||||
@override
|
||||
void layout(Constraints constraints, {bool parentUsesSize = false}) {
|
||||
if (hasSize && constraints != this.constraints &&
|
||||
_cachedBaselines != null && _cachedBaselines!.isNotEmpty) {
|
||||
// The cached baselines data may need update if the constraints change.
|
||||
_cachedBaselines?.clear();
|
||||
}
|
||||
super.layout(constraints, parentUsesSize: parentUsesSize);
|
||||
}
|
||||
|
||||
/// {@macro flutter.rendering.RenderObject.performResize}
|
||||
///
|
||||
/// By default this method sets [size] to the result of [computeDryLayout]
|
||||
|
@ -2710,6 +2964,22 @@ abstract class RenderBox extends RenderObject {
|
|||
@override
|
||||
void debugPaint(PaintingContext context, Offset offset) {
|
||||
assert(() {
|
||||
// Only perform the baseline checks after `PipelineOwner.flushLayout` completes.
|
||||
// We can't run this check in the same places we run other intrinsics checks
|
||||
// (in the `RenderBox.size` setter, or after `performResize`), because
|
||||
// `getDistanceToBaseline` may depend on the layout of the child so it's
|
||||
// the safest to only call `getDistanceToBaseline` after the entire tree
|
||||
// finishes doing layout.
|
||||
//
|
||||
// Descendant `RenderObject`s typically call `debugPaint` before their
|
||||
// parents do. This means the baseline implementations are checked from
|
||||
// descendants to ancestors, allowing us to spot the `RenderBox` with an
|
||||
// inconsistent implementation, instead of its ancestors that only reported
|
||||
// inconsistent baseline values because one of its ancestors has an
|
||||
// inconsistent implementation.
|
||||
if (debugCheckIntrinsicSizes) {
|
||||
_debugVerifyDryBaselines();
|
||||
}
|
||||
if (debugPaintSizeEnabled) {
|
||||
debugPaintSize(context, offset);
|
||||
}
|
||||
|
@ -2812,12 +3082,12 @@ mixin RenderBoxContainerDefaultsMixin<ChildType extends RenderBox, ParentDataTyp
|
|||
assert(!debugNeedsLayout);
|
||||
ChildType? child = firstChild;
|
||||
while (child != null) {
|
||||
final ParentDataType? childParentData = child.parentData as ParentDataType?;
|
||||
final ParentDataType childParentData = child.parentData! as ParentDataType;
|
||||
final double? result = child.getDistanceToActualBaseline(baseline);
|
||||
if (result != null) {
|
||||
return result + childParentData!.offset.dy;
|
||||
return result + childParentData.offset.dy;
|
||||
}
|
||||
child = childParentData!.nextSibling;
|
||||
child = childParentData.nextSibling;
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
@ -2828,22 +3098,15 @@ mixin RenderBoxContainerDefaultsMixin<ChildType extends RenderBox, ParentDataTyp
|
|||
/// order in the child list.
|
||||
double? defaultComputeDistanceToHighestActualBaseline(TextBaseline baseline) {
|
||||
assert(!debugNeedsLayout);
|
||||
double? result;
|
||||
BaselineOffset minBaseline = BaselineOffset.noBaseline;
|
||||
ChildType? child = firstChild;
|
||||
while (child != null) {
|
||||
final ParentDataType childParentData = child.parentData! as ParentDataType;
|
||||
double? candidate = child.getDistanceToActualBaseline(baseline);
|
||||
if (candidate != null) {
|
||||
candidate += childParentData.offset.dy;
|
||||
if (result != null) {
|
||||
result = math.min(result, candidate);
|
||||
} else {
|
||||
result = candidate;
|
||||
}
|
||||
}
|
||||
final BaselineOffset candidate = BaselineOffset(child.getDistanceToActualBaseline(baseline)) + childParentData.offset.dy;
|
||||
minBaseline = minBaseline.minOf(candidate);
|
||||
child = childParentData.nextSibling;
|
||||
}
|
||||
return result;
|
||||
return minBaseline.offset;
|
||||
}
|
||||
|
||||
/// Performs a hit test on each child by walking the child list backwards.
|
||||
|
|
|
@ -2213,16 +2213,16 @@ abstract class RenderObject with DiagnosticableTreeMixin implements HitTestTarge
|
|||
@protected
|
||||
void debugAssertDoesMeetConstraints();
|
||||
|
||||
/// When true, debugAssertDoesMeetConstraints() is currently
|
||||
/// executing asserts for verifying the consistent behavior of
|
||||
/// When true, a debug method ([debugAssertDoesMeetConstraints], for instance)
|
||||
/// is currently executing asserts for verifying the consistent behavior of
|
||||
/// intrinsic dimensions methods.
|
||||
///
|
||||
/// This should only be set by debugAssertDoesMeetConstraints()
|
||||
/// implementations. It is used by tests to selectively ignore
|
||||
/// custom layout callbacks. It should not be set outside of
|
||||
/// debugAssertDoesMeetConstraints(), and should not be checked in
|
||||
/// release mode (where it will always be false).
|
||||
/// This is typically set by framework debug methods. It is read by tests to
|
||||
/// selectively ignore custom layout callbacks. It should not be set outside of
|
||||
/// intrinsic-checking debug methods, and should not be checked in release mode
|
||||
/// (where it will always be false).
|
||||
static bool debugCheckingIntrinsics = false;
|
||||
|
||||
bool _debugSubtreeRelayoutRootAlreadyMarkedNeedsLayout() {
|
||||
if (_relayoutBoundary == null) {
|
||||
// We don't know where our relayout boundary is yet.
|
||||
|
|
|
@ -700,8 +700,9 @@ class RenderIndexedStack extends RenderStack {
|
|||
|
||||
@override
|
||||
void visitChildrenForSemantics(RenderObjectVisitor visitor) {
|
||||
if (index != null && firstChild != null) {
|
||||
visitor(_childAtIndex());
|
||||
final RenderBox? displayedChild = _childAtIndex();
|
||||
if (displayedChild != null) {
|
||||
visitor(displayedChild);
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -715,45 +716,55 @@ class RenderIndexedStack extends RenderStack {
|
|||
}
|
||||
}
|
||||
|
||||
RenderBox _childAtIndex() {
|
||||
assert(index != null);
|
||||
RenderBox? child = firstChild;
|
||||
int i = 0;
|
||||
while (child != null && i < index!) {
|
||||
final StackParentData childParentData = child.parentData! as StackParentData;
|
||||
child = childParentData.nextSibling;
|
||||
i += 1;
|
||||
RenderBox? _childAtIndex() {
|
||||
final int? index = this.index;
|
||||
if (index == null) {
|
||||
return null;
|
||||
}
|
||||
assert(i == index);
|
||||
assert(child != null);
|
||||
return child!;
|
||||
RenderBox? child = firstChild;
|
||||
for (int i = 0; i < index && child != null; i += 1) {
|
||||
child = childAfter(child);
|
||||
}
|
||||
assert(firstChild == null || child != null);
|
||||
return child;
|
||||
}
|
||||
|
||||
@override
|
||||
double? computeDistanceToActualBaseline(TextBaseline baseline) {
|
||||
final RenderBox? displayedChild = _childAtIndex();
|
||||
if (displayedChild == null) {
|
||||
return null;
|
||||
}
|
||||
final StackParentData childParentData = displayedChild.parentData! as StackParentData;
|
||||
final BaselineOffset offset = BaselineOffset(displayedChild.getDistanceToActualBaseline(baseline)) + childParentData.offset.dy;
|
||||
return offset.offset;
|
||||
}
|
||||
|
||||
@override
|
||||
bool hitTestChildren(BoxHitTestResult result, { required Offset position }) {
|
||||
if (firstChild == null || index == null) {
|
||||
final RenderBox? displayedChild = _childAtIndex();
|
||||
if (displayedChild == null) {
|
||||
return false;
|
||||
}
|
||||
final RenderBox child = _childAtIndex();
|
||||
final StackParentData childParentData = child.parentData! as StackParentData;
|
||||
final StackParentData childParentData = displayedChild.parentData! as StackParentData;
|
||||
return result.addWithPaintOffset(
|
||||
offset: childParentData.offset,
|
||||
position: position,
|
||||
hitTest: (BoxHitTestResult result, Offset transformed) {
|
||||
assert(transformed == position - childParentData.offset);
|
||||
return child.hitTest(result, position: transformed);
|
||||
return displayedChild.hitTest(result, position: transformed);
|
||||
},
|
||||
);
|
||||
}
|
||||
|
||||
@override
|
||||
void paintStack(PaintingContext context, Offset offset) {
|
||||
if (firstChild == null || index == null) {
|
||||
final RenderBox? displayedChild = _childAtIndex();
|
||||
if (displayedChild == null) {
|
||||
return;
|
||||
}
|
||||
final RenderBox child = _childAtIndex();
|
||||
final StackParentData childParentData = child.parentData! as StackParentData;
|
||||
context.paintChild(child, childParentData.offset + offset);
|
||||
final StackParentData childParentData = displayedChild.parentData! as StackParentData;
|
||||
context.paintChild(displayedChild, childParentData.offset + offset);
|
||||
}
|
||||
|
||||
@override
|
||||
|
|
|
@ -10,11 +10,6 @@ import 'package:flutter_test/flutter_test.dart';
|
|||
|
||||
const List<String> menuItems = <String>['one', 'two', 'three', 'four'];
|
||||
void onChanged<T>(T _) { }
|
||||
final Type dropdownButtonType = DropdownButton<String>(
|
||||
onChanged: (_) { },
|
||||
items: const <DropdownMenuItem<String>>[],
|
||||
).runtimeType;
|
||||
|
||||
Finder _iconRichText(Key iconKey) {
|
||||
return find.descendant(
|
||||
of: find.byKey(iconKey),
|
||||
|
@ -566,8 +561,7 @@ void main() {
|
|||
}
|
||||
});
|
||||
|
||||
testWidgets('DropdownButtonFormField with isDense:true does not clip large scale text',
|
||||
(WidgetTester tester) async {
|
||||
testWidgets('DropdownButtonFormField with isDense:true does not clip large scale text', (WidgetTester tester) async {
|
||||
final Key buttonKey = UniqueKey();
|
||||
const String value = 'two';
|
||||
|
||||
|
@ -588,9 +582,11 @@ void main() {
|
|||
return DropdownMenuItem<String>(
|
||||
key: ValueKey<String>(item),
|
||||
value: item,
|
||||
child: Text(item,
|
||||
key: ValueKey<String>('${item}Text'),
|
||||
style: const TextStyle(fontSize: 20.0)),
|
||||
child: Text(
|
||||
item,
|
||||
key: ValueKey<String>('${item}Text'),
|
||||
style: const TextStyle(fontSize: 20.0),
|
||||
),
|
||||
);
|
||||
}).toList(),
|
||||
),
|
||||
|
@ -601,8 +597,7 @@ void main() {
|
|||
),
|
||||
);
|
||||
|
||||
final RenderBox box =
|
||||
tester.renderObject<RenderBox>(find.byType(dropdownButtonType));
|
||||
final RenderBox box = tester.renderObject<RenderBox>(find.byType(DropdownButton<String>));
|
||||
expect(box.size.height, 64.0);
|
||||
});
|
||||
|
||||
|
@ -633,7 +628,7 @@ void main() {
|
|||
),
|
||||
);
|
||||
|
||||
final RenderBox box = tester.renderObject<RenderBox>(find.byType(dropdownButtonType));
|
||||
final RenderBox box = tester.renderObject<RenderBox>(find.byType(DropdownButton<String>));
|
||||
expect(box.size.height, 48.0);
|
||||
});
|
||||
|
||||
|
@ -1077,7 +1072,7 @@ void main() {
|
|||
expect(find.text(currentValue), findsOneWidget);
|
||||
|
||||
// Tap the DropdownButtonFormField widget
|
||||
await tester.tap(find.byType(dropdownButtonType));
|
||||
await tester.tap(find.byType(DropdownButton<String>));
|
||||
await tester.pumpAndSettle();
|
||||
|
||||
// Tap the first dropdown menu item.
|
||||
|
|
|
@ -1274,7 +1274,7 @@ void main() {
|
|||
});
|
||||
|
||||
testWidgets('Material2 - ToggleButtons text baseline alignment', (WidgetTester tester) async {
|
||||
// The point size of the fonts must be a multiple of 4 until
|
||||
// The font size must be a multiple of 4 until
|
||||
// https://github.com/flutter/flutter/issues/122066 is resolved.
|
||||
await tester.pumpWidget(
|
||||
boilerplate(
|
||||
|
|
|
@ -1227,6 +1227,23 @@ void main() {
|
|||
);
|
||||
layout(goodRoot, onErrors: () { assert(false); });
|
||||
});
|
||||
|
||||
group('BaselineOffset', () {
|
||||
test('minOf', () {
|
||||
expect(BaselineOffset.noBaseline.minOf(BaselineOffset.noBaseline), BaselineOffset.noBaseline);
|
||||
|
||||
expect(BaselineOffset.noBaseline.minOf(const BaselineOffset(1)), const BaselineOffset(1));
|
||||
expect(const BaselineOffset(1).minOf(BaselineOffset.noBaseline), const BaselineOffset(1));
|
||||
|
||||
expect(const BaselineOffset(2).minOf(const BaselineOffset(1)), const BaselineOffset(1));
|
||||
expect(const BaselineOffset(1).minOf(const BaselineOffset(2)), const BaselineOffset(1));
|
||||
});
|
||||
|
||||
test('+', () {
|
||||
expect(BaselineOffset.noBaseline + 2, BaselineOffset.noBaseline);
|
||||
expect(const BaselineOffset(1) + 2, const BaselineOffset(3));
|
||||
});
|
||||
});
|
||||
}
|
||||
|
||||
class _DummyHitTestTarget implements HitTestTarget {
|
||||
|
|
|
@ -37,6 +37,34 @@ class RenderTestBox extends RenderBox {
|
|||
}
|
||||
}
|
||||
|
||||
class RenderDryBaselineTestBox extends RenderTestBox {
|
||||
double? baselineOverride;
|
||||
|
||||
@override
|
||||
double? computeDryBaseline(covariant BoxConstraints constraints, TextBaseline baseline) {
|
||||
calls += 1;
|
||||
return baselineOverride ?? constraints.biggest.height / 2.0;
|
||||
}
|
||||
}
|
||||
|
||||
class RenderBadDryBaselineTestBox extends RenderTestBox {
|
||||
@override
|
||||
double? computeDryBaseline(covariant BoxConstraints constraints, TextBaseline baseline) {
|
||||
return size.height / 2.0;
|
||||
}
|
||||
}
|
||||
|
||||
class RenderCannotComputeDryBaselineTestBox extends RenderTestBox {
|
||||
bool shouldAssert = true;
|
||||
@override
|
||||
double? computeDryBaseline(covariant BoxConstraints constraints, TextBaseline baseline) {
|
||||
if (shouldAssert) {
|
||||
assert(debugCannotComputeDryLayout(reason: 'no dry baseline for you'));
|
||||
}
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
void main() {
|
||||
TestRenderingFlutterBinding.ensureInitialized();
|
||||
|
||||
|
@ -134,4 +162,99 @@ void main() {
|
|||
|
||||
expect(test.calls, 3); // Use the cached data if the layout constraints do not change.
|
||||
});
|
||||
|
||||
group('Dry baseline', () {
|
||||
test('computeDryBaseline results are cached and shared with computeDistanceToActualBaseline', () {
|
||||
const double viewHeight = 200.0;
|
||||
const BoxConstraints constraints = BoxConstraints.tightFor(width: 200.0, height: viewHeight);
|
||||
final RenderDryBaselineTestBox test = RenderDryBaselineTestBox();
|
||||
final RenderBox baseline = RenderBaseline(
|
||||
baseline: 0.0,
|
||||
baselineType: TextBaseline.alphabetic,
|
||||
child: test,
|
||||
);
|
||||
|
||||
final RenderConstrainedBox root = RenderConstrainedBox(
|
||||
additionalConstraints: constraints,
|
||||
child: baseline,
|
||||
);
|
||||
|
||||
layout(RenderPositionedBox(child: root));
|
||||
expect(test.calls, 1);
|
||||
|
||||
// The baseline widget loosens the input constraints when passing on to child.
|
||||
expect(test.getDryBaseline(constraints.loosen(), TextBaseline.alphabetic), test.boxSize.height / 2);
|
||||
// There's cache for the constraints so this should be 1, but we always evaluate
|
||||
// computeDryBaseline in debug mode in case it asserts even if the baseline
|
||||
// cache hits.
|
||||
expect(test.calls, 2);
|
||||
|
||||
const BoxConstraints newConstraints = BoxConstraints.tightFor(width: 10.0, height: 10.0);
|
||||
expect(test.getDryBaseline(newConstraints.loosen(), TextBaseline.alphabetic), 5.0);
|
||||
// Should be 3 but there's an additional computeDryBaseline call in getDryBaseline,
|
||||
// in an assert.
|
||||
expect(test.calls, 4);
|
||||
|
||||
root.additionalConstraints = newConstraints;
|
||||
pumpFrame();
|
||||
expect(test.calls, 4);
|
||||
});
|
||||
|
||||
test('Asserts when a RenderBox cannot compute dry baseline', () {
|
||||
final RenderCannotComputeDryBaselineTestBox test = RenderCannotComputeDryBaselineTestBox();
|
||||
layout(RenderBaseline(baseline: 0.0, baselineType: TextBaseline.alphabetic, child: test));
|
||||
|
||||
final BoxConstraints incomingConstraints = test.constraints;
|
||||
assert(incomingConstraints != const BoxConstraints());
|
||||
expect(
|
||||
() => test.getDryBaseline(const BoxConstraints(), TextBaseline.alphabetic),
|
||||
throwsA(isA<AssertionError>().having((AssertionError e) => e.message, 'message', contains('no dry baseline for you'))),
|
||||
);
|
||||
|
||||
// Still throws when there is cache.
|
||||
expect(
|
||||
() => test.getDryBaseline(incomingConstraints, TextBaseline.alphabetic),
|
||||
throwsA(isA<AssertionError>().having((AssertionError e) => e.message, 'message', contains('no dry baseline for you'))),
|
||||
);
|
||||
});
|
||||
|
||||
test('Cactches inconsistencies between computeDryBaseline and computeDistanceToActualBaseline', () {
|
||||
final RenderDryBaselineTestBox test = RenderDryBaselineTestBox();
|
||||
layout(test, phase: EnginePhase.composite);
|
||||
|
||||
FlutterErrorDetails? error;
|
||||
test.markNeedsLayout();
|
||||
test.baselineOverride = 123;
|
||||
pumpFrame(phase: EnginePhase.composite, onErrors: () {
|
||||
error = TestRenderingFlutterBinding.instance.takeFlutterErrorDetails();
|
||||
});
|
||||
|
||||
expect(error?.exceptionAsString(), contains('differs from the baseline location computed by computeDryBaseline'));
|
||||
});
|
||||
|
||||
test('Accessing RenderBox.size in computeDryBaseline is not allowed', () {
|
||||
final RenderBadDryBaselineTestBox test = RenderBadDryBaselineTestBox();
|
||||
FlutterErrorDetails? error;
|
||||
layout(test, phase: EnginePhase.composite, onErrors: () {
|
||||
error = TestRenderingFlutterBinding.instance.takeFlutterErrorDetails();
|
||||
});
|
||||
|
||||
expect(error?.exceptionAsString(), contains('RenderBox.size accessed in RenderBadDryBaselineTestBox.computeDryBaseline.'));
|
||||
});
|
||||
|
||||
test('debug baseline checks do not freak out when debugCannotComputeDryLayout is called', () {
|
||||
FlutterErrorDetails? error;
|
||||
void onErrors() {
|
||||
error = TestRenderingFlutterBinding.instance.takeFlutterErrorDetails();
|
||||
}
|
||||
final RenderCannotComputeDryBaselineTestBox test = RenderCannotComputeDryBaselineTestBox();
|
||||
layout(test, phase: EnginePhase.composite, onErrors: onErrors);
|
||||
expect(error, isNull);
|
||||
|
||||
test.shouldAssert = false;
|
||||
test.markNeedsLayout();
|
||||
pumpFrame(phase: EnginePhase.composite, onErrors: onErrors);
|
||||
expect(error?.exceptionAsString(), contains('differs from the baseline location computed by computeDryBaseline'));
|
||||
});
|
||||
});
|
||||
}
|
||||
|
|
|
@ -119,6 +119,7 @@ void main() {
|
|||
visitedChildren.add(child);
|
||||
}
|
||||
|
||||
layout(stack);
|
||||
stack.visitChildrenForSemantics(visitor);
|
||||
|
||||
expect(visitedChildren, hasLength(1));
|
||||
|
|
|
@ -3,6 +3,7 @@
|
|||
// found in the LICENSE file.
|
||||
|
||||
import 'package:flutter/material.dart';
|
||||
import 'package:flutter/rendering.dart';
|
||||
import 'package:flutter_test/flutter_test.dart';
|
||||
|
||||
void main() {
|
||||
|
@ -44,6 +45,8 @@ void main() {
|
|||
});
|
||||
|
||||
testWidgets('Chip caches baseline', (WidgetTester tester) async {
|
||||
final bool checkIntrinsicSizes = debugCheckIntrinsicSizes;
|
||||
debugCheckIntrinsicSizes = false;
|
||||
int calls = 0;
|
||||
await tester.pumpWidget(
|
||||
MaterialApp(
|
||||
|
@ -53,6 +56,7 @@ void main() {
|
|||
baselineType: TextBaseline.alphabetic,
|
||||
child: Chip(
|
||||
label: BaselineDetector(() {
|
||||
assert(!debugCheckIntrinsicSizes);
|
||||
calls += 1;
|
||||
}),
|
||||
),
|
||||
|
@ -66,9 +70,12 @@ void main() {
|
|||
tester.renderObject<RenderBaselineDetector>(find.byType(BaselineDetector)).dirty();
|
||||
await tester.pump();
|
||||
expect(calls, 2);
|
||||
debugCheckIntrinsicSizes = checkIntrinsicSizes;
|
||||
});
|
||||
|
||||
testWidgets('ListTile caches baseline', (WidgetTester tester) async {
|
||||
final bool checkIntrinsicSizes = debugCheckIntrinsicSizes;
|
||||
debugCheckIntrinsicSizes = false;
|
||||
int calls = 0;
|
||||
await tester.pumpWidget(
|
||||
MaterialApp(
|
||||
|
@ -78,6 +85,7 @@ void main() {
|
|||
baselineType: TextBaseline.alphabetic,
|
||||
child: ListTile(
|
||||
title: BaselineDetector(() {
|
||||
assert(!debugCheckIntrinsicSizes);
|
||||
calls += 1;
|
||||
}),
|
||||
),
|
||||
|
@ -91,6 +99,7 @@ void main() {
|
|||
tester.renderObject<RenderBaselineDetector>(find.byType(BaselineDetector)).dirty();
|
||||
await tester.pump();
|
||||
expect(calls, 2);
|
||||
debugCheckIntrinsicSizes = checkIntrinsicSizes;
|
||||
});
|
||||
|
||||
testWidgets("LayoutBuilder returns child's baseline", (WidgetTester tester) async {
|
||||
|
|
Loading…
Reference in a new issue