public Size layoutChild(object childId, BoxConstraints constraints) {
RenderBox child = this._idToChild[childId];
D.assert(() => {
if (child == null) {
throw new UIWidgetsError(
$"The {this} custom multichild layout delegate tried to lay out a non-existent child.\n" +
$"There is no child with the id \"{childId}\"."
);
}
if (!this._debugChildrenNeedingLayout.Remove(child)) {
throw new UIWidgetsError(
$"The $this custom multichild layout delegate tried to lay out the child with id \"{childId}\" more than once.\n" +
"Each child must be laid out exactly once."
);
}
try {
D.assert(constraints.debugAssertIsValid(isAppliedConstraint: true));
}
catch (AssertionError exception) {
throw new UIWidgetsError(
$"The {this} custom multichild layout delegate provided invalid box constraints for the child with id \"{childId}\".\n" +
$"{exception}n" +
"The minimum width and height must be greater than or equal to zero.\n" +
"The maximum width must be greater than or equal to the minimum width.\n" +
"The maximum height must be greater than or equal to the minimum height.");
}
return true;
});
child.layout(constraints, parentUsesSize: true);
return child.size;
}
protected override void performLayout()
{
this.size = this._getSize(this.constraints);
if (this.child != null)
{
BoxConstraints childConstraints = this.layoutDelegate.getConstraintsForChild(this.constraints);
D.assert(childConstraints.debugAssertIsValid(isAppliedConstraint: true));
this.child.layout(childConstraints, parentUsesSize: !childConstraints.isTight);
BoxParentData childParentData = (BoxParentData)this.child.parentData;
childParentData.offset = this.layoutDelegate.getPositionForChild(this.size,
childConstraints.isTight ? childConstraints.smallest : this.child.size);
}
}
public Size layoutChild(object childId, BoxConstraints constraints)
{
RenderBox child = _idToChild[childId];
D.assert(() => {
if (child == null)
{
throw new UIWidgetsError(
$"The {this} custom multichild layout delegate tried to lay out a non-existent child.\n" +
$"There is no child with the id \"{childId}\"."
);
}
if (!_debugChildrenNeedingLayout.Remove(child))
{
throw new UIWidgetsError(
$"The $this custom multichild layout delegate tried to lay out the child with id \"{childId}\" more than once.\n" +
"Each child must be laid out exactly once."
);
}
try {
D.assert(constraints.debugAssertIsValid(isAppliedConstraint: true));
}
catch (AssertionError exception) {
throw new UIWidgetsError(new List <DiagnosticsNode> {
new ErrorSummary(
$"The $this custom multichild layout delegate provided invalid box constraints for the child with id {childId}."),
new DiagnosticsProperty <AssertionError>("Exception", exception, showName: false),
new ErrorDescription(
"The minimum width and height must be greater than or equal to zero.\n" +
"The maximum width must be greater than or equal to the minimum width.\n" +
"The maximum height must be greater than or equal to the minimum height."
)
});
}
return(true);
});
child.layout(constraints, parentUsesSize: true);
return(child.size);
}
public AnimatedContainer(
Key key = null,
AlignmentGeometry alignment = null,
EdgeInsetsGeometry padding = null,
Color color = null,
Decoration decoration = null,
Decoration foregroundDecoration = null,
float?width = null,
float?height = null,
BoxConstraints constraints = null,
EdgeInsetsGeometry margin = null,
Matrix4 transform = null,
Widget child = null,
Curve curve = null,
TimeSpan?duration = null,
VoidCallback onEnd = null
) : base(key: key, curve: curve ?? Curves.linear, duration: duration, onEnd: onEnd)
{
D.assert(duration != null);
D.assert(margin == null || margin.isNonNegative);
D.assert(padding == null || padding.isNonNegative);
D.assert(decoration == null || decoration.debugAssertIsValid());
D.assert(constraints == null || constraints.debugAssertIsValid());
D.assert(color == null || decoration == null,
() => "Cannot provide both a color and a decoration\n" +
"The color argument is just a shorthand for \"decoration: new BoxDecoration(backgroundColor: color)\".");
this.alignment = alignment;
this.padding = padding;
this.foregroundDecoration = foregroundDecoration;
this.margin = margin;
this.transform = transform;
this.child = child;
this.decoration = decoration ?? (color != null ? new BoxDecoration(color: color) : null);
this.constraints =
(width != null || height != null)
? constraints?.tighten(width: width, height: height)
?? BoxConstraints.tightFor(width: width, height: height)
: constraints;
}
public Container(
Key key = null,
AlignmentGeometry alignment = null,
EdgeInsetsGeometry padding = null,
Color color = null,
Decoration decoration = null,
Decoration foregroundDecoration = null,
float?width = null,
float?height = null,
BoxConstraints constraints = null,
EdgeInsetsGeometry margin = null,
Matrix4 transform = null,
Widget child = null,
Clip clipBehavior = Clip.none
) : base(key: key)
{
D.assert(margin == null || margin.isNonNegative);
D.assert(padding == null || padding.isNonNegative);
D.assert(decoration == null || decoration.debugAssertIsValid());
D.assert(constraints == null || constraints.debugAssertIsValid());
D.assert(color == null || decoration == null,
() => "Cannot provide both a color and a decoration\n" +
"The color argument is just a shorthand for \"decoration: new BoxDecoration(color: color)\"."
);
D.assert(clipBehavior != null);
this.alignment = alignment;
this.padding = padding;
this.foregroundDecoration = foregroundDecoration;
this.color = color;
this.decoration = decoration;// ?? (color != null ? new BoxDecoration(color) : null);
this.constraints = (width != null || height != null)
? (constraints != null ? constraints.tighten(width, height) : BoxConstraints.tightFor(width, height))
: constraints;
this.margin = margin;
this.transform = transform;
this.child = child;
this.clipBehavior = clipBehavior;
}
public Container(
Key key = null,
Alignment alignment = null,
EdgeInsets padding = null,
Color color = null,
Decoration decoration = null,
Decoration forgroundDecoration = null,
double?width = null,
double?height = null,
BoxConstraints constraints = null,
EdgeInsets margin = null,
Matrix3 transfrom = null,
Widget child = null
) : base(key)
{
D.assert(margin == null || margin.isNonNegative);
D.assert(padding == null || padding.isNonNegative);
D.assert(decoration == null || decoration.debugAssertIsValid());
D.assert(constraints == null || constraints.debugAssertIsValid());
D.assert(color == null || decoration == null,
"Cannot provide both a color and a decoration\n" +
"The color argument is just a shorthand for \"decoration: new BoxDecoration(color: color)\"."
);
this.alignment = alignment;
this.padding = padding;
this.foregroundDecoration = forgroundDecoration;
this.margin = margin;
this.transform = transfrom;
this.child = child;
this.decoration = decoration ?? (color != null ? new BoxDecoration(color) : null);
this.constraints = (width != null || height != null)
? (constraints != null ? constraints.tighten(width, height) : BoxConstraints.tightFor(width, height))
: constraints;
}
Size _getSize(BoxConstraints constraints)
{
D.assert(constraints.debugAssertIsValid());
return(constraints.constrain(this._delegate.getSize(constraints)));
}
