public override bool debugAssertIsValid(
bool isAppliedConstraint = false,
InformationCollector informationCollector = null
)
{
D.assert(() => {
var verify = new Action <bool, string>((bool check, string message) => {
if (check)
{
return;
}
var information = new StringBuilder();
if (informationCollector != null)
{
informationCollector(information);
}
throw new UIWidgetsError(
$"{this.GetType()} is not valid: {message}\n{information}The offending constraints were: \n {this}");
});
verify(this.scrollOffset >= 0.0f, "The \"scrollOffset\" is negative.");
verify(this.crossAxisExtent >= 0.0f, "The \"crossAxisExtent\" is negative.");
verify(
AxisUtils.axisDirectionToAxis(this.axisDirection) !=
AxisUtils.axisDirectionToAxis(this.crossAxisDirection),
"The \"axisDirection\" and the \"crossAxisDirection\" are along the same axis.");
verify(this.viewportMainAxisExtent >= 0.0f, "The \"viewportMainAxisExtent\" is negative.");
verify(this.remainingPaintExtent >= 0.0f, "The \"remainingPaintExtent\" is negative.");
verify(this.remainingCacheExtent >= 0.0f, "The \"remainingCacheExtent\" is negative.");
verify(this.cacheOrigin <= 0.0f, "The \"cacheOrigin\" is positive.");
verify(this.isNormalized, "The constraints are not normalized.");
return(true);
});
return(true);
}
public static Axis?axis(this ScrollMetrics it)
{
return(AxisUtils.axisDirectionToAxis(axisDirection: it.axisDirection));
}
public override bool debugAssertIsValid(
bool isAppliedConstraint = false,
InformationCollector informationCollector = null
)
{
D.assert(() => {
bool hasErrors = false;
StringBuilder errorMessage = new StringBuilder("\n");
var verify = new Action <bool, string>((bool check, string message) => {
if (check)
{
return;
}
hasErrors = true;
errorMessage.AppendLine($" {message}");
});
void verifyFloat(float?property, string name, bool mustBePositive = false, bool mustBeNegative = false)
{
verify(property != null, $"The \"{name}\" is null.");
if (property.Value.isNaN())
{
string additional = ".";
if (mustBePositive)
{
additional = ", expected greater than or equal to zero.";
}
else if (mustBeNegative)
{
additional = ", expected less than or equal to zero.";
}
verify(false, $"The \"{name}\" is NaN" + $"{additional}");
}
else if (mustBePositive)
{
verify(property >= 0.0f, $"The \"{name}\" is negative.");
}
else if (mustBeNegative)
{
verify(property <= 0.0f, $"The \"{name}\" is positive.");
}
}
verify(axis != null, "The \"axis\" is null.");
verify(growthDirection != null, "The \"growthDirection\" is null.");
verifyFloat(scrollOffset, "scrollOffset");
verifyFloat(overlap, "overlap");
verifyFloat(crossAxisExtent, "crossAxisExtent");
verifyFloat(scrollOffset, "scrollOffset", mustBePositive: true);
verify(crossAxisDirection != null, "The \"crossAxisDirection\" is null.");
verify(AxisUtils.axisDirectionToAxis(axisDirection) != AxisUtils.axisDirectionToAxis(crossAxisDirection), "The \"axisDirection\" and the \"crossAxisDirection\" are along the same axis.");
verifyFloat(viewportMainAxisExtent, "viewportMainAxisExtent", mustBePositive: true);
verifyFloat(remainingPaintExtent, "remainingPaintExtent", mustBePositive: true);
verifyFloat(remainingCacheExtent, "remainingCacheExtent", mustBePositive: true);
verifyFloat(cacheOrigin, "cacheOrigin", mustBeNegative: true);
verifyFloat(precedingScrollExtent, "precedingScrollExtent", mustBePositive: true);
verify(isNormalized, "The constraints are not normalized."); // should be redundant with earlier checks
if (hasErrors)
{
List <DiagnosticsNode> diagnosticInfo = new List <DiagnosticsNode>();
diagnosticInfo.Add(new ErrorSummary($"{GetType()} is not valid: {errorMessage}"));
if (informationCollector != null)
{
diagnosticInfo.AddRange(informationCollector.Invoke());
}
diagnosticInfo.Add(new DiagnosticsProperty <SliverConstraints>("The offending constraints were", this, style: DiagnosticsTreeStyle.errorProperty));
throw new UIWidgetsError(diagnosticInfo);
}
return(true);
});
return(true);
}