blob: 7da83633f7d1ef60ab29f93078d13e5af2d02f6a [file] [log] [blame]
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:ui' as ui show lerpDouble, WindowPadding;
import 'package:flutter/foundation.dart';
import 'basic_types.dart';
/// Base class for [EdgeInsets] that allows for text-direction aware
/// resolution.
///
/// A property or argument of this type accepts classes created either with [new
/// EdgeInsets.fromLTRB] and its variants, or [new
/// EdgeInsetsDirectional.fromSTEB] and its variants.
///
/// To convert an [EdgeInsetsGeometry] object of indeterminate type into a
/// [EdgeInsets] object, call the [resolve] method.
///
/// See also:
///
/// * [Padding], a widget that describes margins using [EdgeInsetsGeometry].
@immutable
abstract class EdgeInsetsGeometry {
/// Abstract const constructor. This constructor enables subclasses to provide
/// const constructors so that they can be used in const expressions.
const EdgeInsetsGeometry();
double get _bottom;
double get _end;
double get _left;
double get _right;
double get _start;
double get _top;
/// Whether every dimension is non-negative.
bool get isNonNegative {
return _left >= 0.0
&& _right >= 0.0
&& _start >= 0.0
&& _end >= 0.0
&& _top >= 0.0
&& _bottom >= 0.0;
}
/// The total offset in the vertical direction.
double get horizontal => _left + _right + _start + _end;
/// The total offset in the horizontal direction.
double get vertical => _top + _bottom;
/// The total offset in the given direction.
double along(Axis axis) {
assert(axis != null);
switch (axis) {
case Axis.horizontal:
return horizontal;
case Axis.vertical:
return vertical;
}
return null;
}
/// The size that this [EdgeInsets] would occupy with an empty interior.
Size get collapsedSize => new Size(horizontal, vertical);
/// An [EdgeInsetsGeometry] with top and bottom, left and right, and start and end flipped.
EdgeInsetsGeometry get flipped => new _MixedEdgeInsets.fromLRSETB(_right, _left, _end, _start, _bottom, _top);
/// Returns a new size that is bigger than the given size by the amount of
/// inset in the horizontal and vertical directions.
///
/// See also:
///
/// * [EdgeInsets.inflateRect], to inflate a [Rect] rather than a [Size] (for
/// [EdgeInsetsDirectional], requires first calling [resolve] to establish
/// how the start and and map to the left or right).
/// * [deflateSize], to deflate a [Size] rather than inflating it.
Size inflateSize(Size size) {
return new Size(size.width + horizontal, size.height + vertical);
}
/// Returns a new size that is smaller than the given size by the amount of
/// inset in the horizontal and vertical directions.
///
/// If the argument is smaller than [collapsedSize], then the resulting size
/// will have negative dimensions.
///
/// See also:
///
/// * [EdgeInsets.deflateRect], to deflate a [Rect] rather than a [Size]. (for
/// [EdgeInsetsDirectional], requires first calling [resolve] to establish
/// how the start and and map to the left or right).
/// * [inflateSize], to inflate a [Size] rather than deflating it.
Size deflateSize(Size size) {
return new Size(size.width - horizontal, size.height - vertical);
}
/// Returns the difference between two [EdgeInsetsGeometry] objects.
///
/// If you know you are applying this to two [EdgeInsets] or two
/// [EdgeInsetsDirectional] objects, consider using the binary infix `-`
/// operator instead, which always returns an object of the same type as the
/// operands, and is typed accordingly.
///
/// If [subtract] is applied to two objects of the same type ([EdgeInsets] or
/// [EdgeInsetsDirectional]), an object of that type will be returned (though
/// this is not reflected in the type system). Otherwise, an object
/// representing a combination of both is returned. That object can be turned
/// into a concrete [EdgeInsets] using [resolve].
///
/// This method returns the same result as [add] applied to the result of
/// negating the argument (using the prefix unary `-` operator or multiplying
/// the argument by -1.0 using the `*` operator).
EdgeInsetsGeometry subtract(EdgeInsetsGeometry other) {
return new _MixedEdgeInsets.fromLRSETB(
_left - other._left,
_right - other._right,
_start - other._start,
_end - other._end,
_top - other._top,
_bottom - other._bottom,
);
}
/// Returns the sum of two [EdgeInsetsGeometry] objects.
///
/// If you know you are adding two [EdgeInsets] or two [EdgeInsetsDirectional]
/// objects, consider using the `+` operator instead, which always returns an
/// object of the same type as the operands, and is typed accordingly.
///
/// If [add] is applied to two objects of the same type ([EdgeInsets] or
/// [EdgeInsetsDirectional]), an object of that type will be returned (though
/// this is not reflected in the type system). Otherwise, an object
/// representing a combination of both is returned. That object can be turned
/// into a concrete [EdgeInsets] using [resolve].
EdgeInsetsGeometry add(EdgeInsetsGeometry other) {
return new _MixedEdgeInsets.fromLRSETB(
_left + other._left,
_right + other._right,
_start + other._start,
_end + other._end,
_top + other._top,
_bottom + other._bottom,
);
}
/// Returns the [EdgeInsetsGeometry] object with each dimension negated.
///
/// This is the same as multiplying the object by -1.0.
///
/// This operator returns an object of the same type as the operand.
EdgeInsetsGeometry operator -();
/// Scales the [EdgeInsetsGeometry] object in each dimension by the given factor.
///
/// This operator returns an object of the same type as the operand.
EdgeInsetsGeometry operator *(double other);
/// Divides the [EdgeInsetsGeometry] object in each dimension by the given factor.
///
/// This operator returns an object of the same type as the operand.
EdgeInsetsGeometry operator /(double other);
/// Integer divides the [EdgeInsetsGeometry] object in each dimension by the given factor.
///
/// This operator returns an object of the same type as the operand.
///
/// This operator may have unexpected results when applied to a mixture of
/// [EdgeInsets] and [EdgeInsetsDirectional] objects.
EdgeInsetsGeometry operator ~/(double other);
/// Computes the remainder in each dimension by the given factor.
///
/// This operator returns an object of the same type as the operand.
///
/// This operator may have unexpected results when applied to a mixture of
/// [EdgeInsets] and [EdgeInsetsDirectional] objects.
EdgeInsetsGeometry operator %(double other);
/// Linearly interpolate between two [EdgeInsetsGeometry] objects.
///
/// If either is null, this function interpolates from [EdgeInsets.zero], and
/// the result is an object of the same type as the non-null argument.
///
/// If [lerp] is applied to two objects of the same type ([EdgeInsets] or
/// [EdgeInsetsDirectional]), an object of that type will be returned (though
/// this is not reflected in the type system). Otherwise, an object
/// representing a combination of both is returned. That object can be turned
/// into a concrete [EdgeInsets] using [resolve].
static EdgeInsetsGeometry lerp(EdgeInsetsGeometry a, EdgeInsetsGeometry b, double t) {
if (a == null && b == null)
return null;
if (a == null)
return b * t;
if (b == null)
return a * (1.0 - t);
if (a is EdgeInsets && b is EdgeInsets)
return EdgeInsets.lerp(a, b, t);
if (a is EdgeInsetsDirectional && b is EdgeInsetsDirectional)
return EdgeInsetsDirectional.lerp(a, b, t);
return new _MixedEdgeInsets.fromLRSETB(
ui.lerpDouble(a._left, b._left, t),
ui.lerpDouble(a._right, b._right, t),
ui.lerpDouble(a._start, b._start, t),
ui.lerpDouble(a._end, b._end, t),
ui.lerpDouble(a._top, b._top, t),
ui.lerpDouble(a._bottom, b._bottom, t)
);
}
/// Convert this instance into an [EdgeInsets], which uses literal coordinates
/// (i.e. the `left` coordinate being explicitly a distance from the left, and
/// the `right` coordinate being explicitly a distance from the right).
///
/// See also:
///
/// * [EdgeInsets], for which this is a no-op (returns itself).
/// * [EdgeInsetsDirectional], which flips the horizontal direction
/// based on the `direction` argument.
EdgeInsets resolve(TextDirection direction);
@override
String toString() {
if (_start == 0.0 && _end == 0.0) {
if (_left == 0.0 && _right == 0.0 && _top == 0.0 && _bottom == 0.0)
return 'EdgeInsets.zero';
if (_left == _right && _right == _top && _top == _bottom)
return 'EdgeInsets.all(${_left.toStringAsFixed(1)})';
return 'EdgeInsets(${_left.toStringAsFixed(1)}, '
'${_top.toStringAsFixed(1)}, '
'${_right.toStringAsFixed(1)}, '
'${_bottom.toStringAsFixed(1)})';
}
if (_left == 0.0 && _right == 0.0) {
return 'EdgeInsetsDirectional(${_start.toStringAsFixed(1)}, '
'${_top.toStringAsFixed(1)}, '
'${_end.toStringAsFixed(1)}, '
'${_bottom.toStringAsFixed(1)})';
}
return 'EdgeInsets(${_left.toStringAsFixed(1)}, '
'${_top.toStringAsFixed(1)}, '
'${_right.toStringAsFixed(1)}, '
'${_bottom.toStringAsFixed(1)})'
' + '
'EdgeInsetsDirectional(${_start.toStringAsFixed(1)}, '
'0.0, '
'${_end.toStringAsFixed(1)}, '
'0.0)';
}
@override
bool operator ==(dynamic other) {
if (other is! EdgeInsetsGeometry)
return false;
final EdgeInsetsGeometry typedOther = other;
return _left == typedOther._left
&& _right == typedOther._right
&& _start == typedOther._start
&& _end == typedOther._end
&& _top == typedOther._top
&& _bottom == typedOther._bottom;
}
@override
int get hashCode => hashValues(_left, _right, _start, _end, _top, _bottom);
}
/// An immutable set of offsets in each of the four cardinal directions.
///
/// Typically used for an offset from each of the four sides of a box. For
/// example, the padding inside a box can be represented using this class.
///
/// The [EdgeInsets] class specifies offsets in terms of visual edges, left,
/// top, right, and bottom. These values are not affected by the
/// [TextDirection]. To support both left-to-right and right-to-left layouts,
/// consider using [EdgeInsetsDirectional], which is expressed in terms of
/// _start_, top, _end_, and bottom, where start and end are resolved in terms
/// of a [TextDirection] (typically obtained from the ambient [Directionality]).
///
/// ## Sample code
///
/// Here are some examples of how to create [EdgeInsets] instances:
///
/// Typical eight-pixel margin on all sides:
///
/// ```dart
/// const EdgeInsets.all(8.0)
/// ```
///
/// Eight pixel margin above and below, no horizontal margins:
///
/// ```dart
/// const EdgeInsets.symmetric(vertical: 8.0)
/// ```
///
/// Left margin indent of 40 pixels:
///
/// ```dart
/// const EdgeInsets.only(left: 40.0)
/// ```
///
/// See also:
///
/// * [Padding], a widget that accepts [EdgeInsets] to describe its margins.
/// * [EdgeInsetsDirectional], which (for properties and arguments that accept
/// the type [EdgeInsetsGeometry]) allows the horizontal insets to be
/// specified in a [TextDirection]-aware manner.
class EdgeInsets extends EdgeInsetsGeometry {
/// Creates insets from offsets from the left, top, right, and bottom.
const EdgeInsets.fromLTRB(this.left, this.top, this.right, this.bottom);
/// Creates insets where all the offsets are `value`.
///
/// ## Sample code
///
/// Typical eight-pixel margin on all sides:
///
/// ```dart
/// const EdgeInsets.all(8.0)
/// ```
const EdgeInsets.all(double value)
: left = value, top = value, right = value, bottom = value;
/// Creates insets with only the given values non-zero.
///
/// ## Sample code
///
/// Left margin indent of 40 pixels:
///
/// ```dart
/// const EdgeInsets.only(left: 40.0)
/// ```
const EdgeInsets.only({
this.left: 0.0,
this.top: 0.0,
this.right: 0.0,
this.bottom: 0.0
});
/// Creates insets with symmetrical vertical and horizontal offsets.
///
/// ## Sample code
///
/// Eight pixel margin above and below, no horizontal margins:
///
/// ```dart
/// const EdgeInsets.symmetric(vertical: 8.0)
/// ```
const EdgeInsets.symmetric({ double vertical: 0.0,
double horizontal: 0.0 })
: left = horizontal, top = vertical, right = horizontal, bottom = vertical;
/// Creates insets that match the given window padding.
///
/// If you need the current system padding or view insets in the context of a
/// widget, consider using [MediaQuery.of] to obtain these values rather than
/// using the value from [dart:ui.window], so that you get notified of
/// changes.
EdgeInsets.fromWindowPadding(ui.WindowPadding padding, double devicePixelRatio)
: left = padding.left / devicePixelRatio,
top = padding.top / devicePixelRatio,
right = padding.right / devicePixelRatio,
bottom = padding.bottom / devicePixelRatio;
/// An [EdgeInsets] with zero offsets in each direction.
static const EdgeInsets zero = const EdgeInsets.only();
/// The offset from the left.
final double left;
@override
double get _left => left;
/// The offset from the top.
final double top;
@override
double get _top => top;
/// The offset from the right.
final double right;
@override
double get _right => right;
/// The offset from the bottom.
final double bottom;
@override
double get _bottom => bottom;
@override
double get _start => 0.0;
@override
double get _end => 0.0;
/// An Offset describing the vector from the top left of a rectangle to the
/// top left of that rectangle inset by this object.
Offset get topLeft => new Offset(left, top);
/// An Offset describing the vector from the top right of a rectangle to the
/// top right of that rectangle inset by this object.
Offset get topRight => new Offset(-right, top);
/// An Offset describing the vector from the bottom left of a rectangle to the
/// bottom left of that rectangle inset by this object.
Offset get bottomLeft => new Offset(left, -bottom);
/// An Offset describing the vector from the bottom right of a rectangle to the
/// bottom right of that rectangle inset by this object.
Offset get bottomRight => new Offset(-right, -bottom);
/// An [EdgeInsets] with top and bottom as well as left and right flipped.
@override
EdgeInsets get flipped => new EdgeInsets.fromLTRB(right, bottom, left, top);
/// Returns a new rect that is bigger than the given rect in each direction by
/// the amount of inset in each direction. Specifically, the left edge of the
/// rect is moved left by [left], the top edge of the rect is moved up by
/// [top], the right edge of the rect is moved right by [right], and the
/// bottom edge of the rect is moved down by [bottom].
///
/// See also:
///
/// * [inflateSize], to inflate a [Size] rather than a [Rect].
/// * [deflateRect], to deflate a [Rect] rather than inflating it.
Rect inflateRect(Rect rect) {
return new Rect.fromLTRB(rect.left - left, rect.top - top, rect.right + right, rect.bottom + bottom);
}
/// Returns a new rect that is smaller than the given rect in each direction by
/// the amount of inset in each direction. Specifically, the left edge of the
/// rect is moved right by [left], the top edge of the rect is moved down by
/// [top], the right edge of the rect is moved left by [right], and the
/// bottom edge of the rect is moved up by [bottom].
///
/// If the argument's [Rect.size] is smaller than [collapsedSize], then the
/// resulting rectangle will have negative dimensions.
///
/// See also:
///
/// * [deflateSize], to deflate a [Size] rather than a [Rect].
/// * [inflateRect], to inflate a [Rect] rather than deflating it.
Rect deflateRect(Rect rect) {
return new Rect.fromLTRB(rect.left + left, rect.top + top, rect.right - right, rect.bottom - bottom);
}
@override
EdgeInsetsGeometry subtract(EdgeInsetsGeometry other) {
if (other is EdgeInsets)
return this - other;
return super.subtract(other);
}
@override
EdgeInsetsGeometry add(EdgeInsetsGeometry other) {
if (other is EdgeInsets)
return this + other;
return super.add(other);
}
/// Returns the difference between two [EdgeInsets].
EdgeInsets operator -(EdgeInsets other) {
return new EdgeInsets.fromLTRB(
left - other.left,
top - other.top,
right - other.right,
bottom - other.bottom,
);
}
/// Returns the sum of two [EdgeInsets].
EdgeInsets operator +(EdgeInsets other) {
return new EdgeInsets.fromLTRB(
left + other.left,
top + other.top,
right + other.right,
bottom + other.bottom,
);
}
/// Returns the [EdgeInsets] object with each dimension negated.
///
/// This is the same as multiplying the object by -1.0.
@override
EdgeInsets operator -() {
return new EdgeInsets.fromLTRB(
-left,
-top,
-right,
-bottom,
);
}
/// Scales the [EdgeInsets] in each dimension by the given factor.
@override
EdgeInsets operator *(double other) {
return new EdgeInsets.fromLTRB(
left * other,
top * other,
right * other,
bottom * other,
);
}
/// Divides the [EdgeInsets] in each dimension by the given factor.
@override
EdgeInsets operator /(double other) {
return new EdgeInsets.fromLTRB(
left / other,
top / other,
right / other,
bottom / other,
);
}
/// Integer divides the [EdgeInsets] in each dimension by the given factor.
@override
EdgeInsets operator ~/(double other) {
return new EdgeInsets.fromLTRB(
(left ~/ other).toDouble(),
(top ~/ other).toDouble(),
(right ~/ other).toDouble(),
(bottom ~/ other).toDouble(),
);
}
/// Computes the remainder in each dimension by the given factor.
@override
EdgeInsets operator %(double other) {
return new EdgeInsets.fromLTRB(
left % other,
top % other,
right % other,
bottom % other,
);
}
/// Linearly interpolate between two [EdgeInsets].
///
/// If either is null, this function interpolates from [EdgeInsets.zero].
static EdgeInsets lerp(EdgeInsets a, EdgeInsets b, double t) {
if (a == null && b == null)
return null;
if (a == null)
return b * t;
if (b == null)
return a * (1.0 - t);
return new EdgeInsets.fromLTRB(
ui.lerpDouble(a.left, b.left, t),
ui.lerpDouble(a.top, b.top, t),
ui.lerpDouble(a.right, b.right, t),
ui.lerpDouble(a.bottom, b.bottom, t),
);
}
@override
EdgeInsets resolve(TextDirection direction) => this;
/// Creates a copy of this EdgeInsets but with the given fields replaced
/// with the new values.
EdgeInsets copyWith({
double left,
double top,
double right,
double bottom,
}) {
return new EdgeInsets.only(
left: left ?? this.left,
top: top ?? this.top,
right: right ?? this.right,
bottom: bottom ?? this.bottom,
);
}
}
/// An immutable set of offsets in each of the four cardinal directions, but
/// whose horizontal components are dependent on the writing direction.
///
/// This can be used to indicate padding from the left in [TextDirection.ltr]
/// text and padding from the right in [TextDirection.rtl] text without having
/// to be aware of the current text direction.
///
/// See also:
///
/// * [EdgeInsets], a variant that uses physical labels (left and right instead
/// of start and end).
class EdgeInsetsDirectional extends EdgeInsetsGeometry {
/// Creates insets from offsets from the start, top, end, and bottom.
const EdgeInsetsDirectional.fromSTEB(this.start, this.top, this.end, this.bottom);
/// Creates insets with only the given values non-zero.
///
/// ## Sample code
///
/// A margin indent of 40 pixels on the leading side:
///
/// ```dart
/// const EdgeInsetsDirectional.only(start: 40.0)
/// ```
const EdgeInsetsDirectional.only({
this.start: 0.0,
this.top: 0.0,
this.end: 0.0,
this.bottom: 0.0
});
/// An [EdgeInsetsDirectional] with zero offsets in each direction.
///
/// Consider using [EdgeInsets.zero] instead, since that object has the same
/// effect, but will be cheaper to [resolve].
static const EdgeInsetsDirectional zero = const EdgeInsetsDirectional.only();
/// The offset from the start side, the side from which the user will start
/// reading text.
///
/// This value is normalized into an [EdgeInsets.left] or [EdgeInsets.right]
/// value by the [resolve] method.
final double start;
@override
double get _start => start;
/// The offset from the top.
///
/// This value is passed through to [EdgeInsets.top] unmodified by the
/// [resolve] method.
final double top;
@override
double get _top => top;
/// The offset from the end side, the side on which the user ends reading
/// text.
///
/// This value is normalized into an [EdgeInsets.left] or [EdgeInsets.right]
/// value by the [resolve] method.
final double end;
@override
double get _end => end;
/// The offset from the bottom.
///
/// This value is passed through to [EdgeInsets.bottom] unmodified by the
/// [resolve] method.
final double bottom;
@override
double get _bottom => bottom;
@override
double get _left => 0.0;
@override
double get _right => 0.0;
@override
bool get isNonNegative => start >= 0.0 && top >= 0.0 && end >= 0.0 && bottom >= 0.0;
/// An [EdgeInsetsDirectional] with [top] and [bottom] as well as [start] and [end] flipped.
@override
EdgeInsetsDirectional get flipped => new EdgeInsetsDirectional.fromSTEB(end, bottom, start, top);
@override
EdgeInsetsGeometry subtract(EdgeInsetsGeometry other) {
if (other is EdgeInsetsDirectional)
return this - other;
return super.subtract(other);
}
@override
EdgeInsetsGeometry add(EdgeInsetsGeometry other) {
if (other is EdgeInsetsDirectional)
return this + other;
return super.add(other);
}
/// Returns the difference between two [EdgeInsetsDirectional] objects.
EdgeInsetsDirectional operator -(EdgeInsetsDirectional other) {
return new EdgeInsetsDirectional.fromSTEB(
start - other.start,
top - other.top,
end - other.end,
bottom - other.bottom,
);
}
/// Returns the sum of two [EdgeInsetsDirectional] objects.
EdgeInsetsDirectional operator +(EdgeInsetsDirectional other) {
return new EdgeInsetsDirectional.fromSTEB(
start + other.start,
top + other.top,
end + other.end,
bottom + other.bottom,
);
}
/// Returns the [EdgeInsetsDirectional] object with each dimension negated.
///
/// This is the same as multiplying the object by -1.0.
@override
EdgeInsetsDirectional operator -() {
return new EdgeInsetsDirectional.fromSTEB(
-start,
-top,
-end,
-bottom,
);
}
/// Scales the [EdgeInsetsDirectional] object in each dimension by the given factor.
@override
EdgeInsetsDirectional operator *(double other) {
return new EdgeInsetsDirectional.fromSTEB(
start * other,
top * other,
end * other,
bottom * other,
);
}
/// Divides the [EdgeInsetsDirectional] object in each dimension by the given factor.
@override
EdgeInsetsDirectional operator /(double other) {
return new EdgeInsetsDirectional.fromSTEB(
start / other,
top / other,
end / other,
bottom / other,
);
}
/// Integer divides the [EdgeInsetsDirectional] object in each dimension by the given factor.
@override
EdgeInsetsDirectional operator ~/(double other) {
return new EdgeInsetsDirectional.fromSTEB(
(start ~/ other).toDouble(),
(top ~/ other).toDouble(),
(end ~/ other).toDouble(),
(bottom ~/ other).toDouble(),
);
}
/// Computes the remainder in each dimension by the given factor.
@override
EdgeInsetsDirectional operator %(double other) {
return new EdgeInsetsDirectional.fromSTEB(
start % other,
top % other,
end % other,
bottom % other,
);
}
/// Linearly interpolate between two [EdgeInsetsDirectional].
///
/// If either is null, this function interpolates from [EdgeInsetsDirectional.zero].
///
/// To interpolate between two [EdgeInsetsGeometry] objects of arbitrary type
/// (either [EdgeInsets] or [EdgeInsetsDirectional]), consider the
/// [EdgeInsetsGeometry.lerp] static method.
static EdgeInsetsDirectional lerp(EdgeInsetsDirectional a, EdgeInsetsDirectional b, double t) {
if (a == null && b == null)
return null;
if (a == null)
return b * t;
if (b == null)
return a * (1.0 - t);
return new EdgeInsetsDirectional.fromSTEB(
ui.lerpDouble(a.start, b.start, t),
ui.lerpDouble(a.top, b.top, t),
ui.lerpDouble(a.end, b.end, t),
ui.lerpDouble(a.bottom, b.bottom, t),
);
}
@override
EdgeInsets resolve(TextDirection direction) {
assert(direction != null);
switch (direction) {
case TextDirection.rtl:
return new EdgeInsets.fromLTRB(end, top, start, bottom);
case TextDirection.ltr:
return new EdgeInsets.fromLTRB(start, top, end, bottom);
}
return null;
}
}
class _MixedEdgeInsets extends EdgeInsetsGeometry {
const _MixedEdgeInsets.fromLRSETB(this._left, this._right, this._start, this._end, this._top, this._bottom);
@override
final double _left;
@override
final double _right;
@override
final double _start;
@override
final double _end;
@override
final double _top;
@override
final double _bottom;
@override
bool get isNonNegative {
return _left >= 0.0
&& _right >= 0.0
&& _start >= 0.0
&& _end >= 0.0
&& _top >= 0.0
&& _bottom >= 0.0;
}
@override
_MixedEdgeInsets operator -() {
return new _MixedEdgeInsets.fromLRSETB(
-_left,
-_right,
-_start,
-_end,
-_top,
-_bottom,
);
}
@override
_MixedEdgeInsets operator *(double other) {
return new _MixedEdgeInsets.fromLRSETB(
_left * other,
_right * other,
_start * other,
_end * other,
_top * other,
_bottom * other,
);
}
@override
_MixedEdgeInsets operator /(double other) {
return new _MixedEdgeInsets.fromLRSETB(
_left / other,
_right / other,
_start / other,
_end / other,
_top / other,
_bottom / other,
);
}
@override
_MixedEdgeInsets operator ~/(double other) {
return new _MixedEdgeInsets.fromLRSETB(
(_left ~/ other).toDouble(),
(_right ~/ other).toDouble(),
(_start ~/ other).toDouble(),
(_end ~/ other).toDouble(),
(_top ~/ other).toDouble(),
(_bottom ~/ other).toDouble(),
);
}
@override
_MixedEdgeInsets operator %(double other) {
return new _MixedEdgeInsets.fromLRSETB(
_left % other,
_right % other,
_start % other,
_end % other,
_top % other,
_bottom % other,
);
}
@override
EdgeInsets resolve(TextDirection direction) {
assert(direction != null);
switch (direction) {
case TextDirection.rtl:
return new EdgeInsets.fromLTRB(_end + _left, _top, _start + _right, _bottom);
case TextDirection.ltr:
return new EdgeInsets.fromLTRB(_start + _left, _top, _end + _right, _bottom);
}
return null;
}
}