public override float applyBoundaryConditions(ScrollMetrics position, float value)
{
D.assert(() => {
if (value == position.pixels)
{
throw new UIWidgetsError(new List <DiagnosticsNode>()
{
new ErrorSummary($"{GetType()}.applyBoundaryConditions() was called redundantly."),
new ErrorDescription($"The proposed new position, {value}, is exactly equal to the current position of the " +
$"given {position.GetType()}, {position.pixels}.\n" +
"The applyBoundaryConditions method should only be called when the value is " +
"going to actually change the pixels, otherwise it is redundant."),
new DiagnosticsProperty <ScrollPhysics>("The physics object in question was", this, style: DiagnosticsTreeStyle.errorProperty),
new DiagnosticsProperty <ScrollMetrics>("The position object in question was", position, style: DiagnosticsTreeStyle.errorProperty)
});
}
return(true);
});
if (value < position.pixels && position.pixels <= position.minScrollExtent)
{
return(value - position.pixels);
}
if (position.maxScrollExtent <= position.pixels && position.pixels < value)
{
return(value - position.pixels);
}
if (value < position.minScrollExtent && position.minScrollExtent < position.pixels)
{
return(value - position.minScrollExtent);
}
if (position.pixels < position.maxScrollExtent && position.maxScrollExtent < value)
{
return(value - position.maxScrollExtent);
}
return(0.0f);
}
public override double applyBoundaryConditions(ScrollMetrics position, double value)
{
D.assert(() => {
if (value == position.pixels)
{
throw new UIWidgetsError(
$"{this.GetType()}.applyBoundaryConditions() was called redundantly.\n" +
$"The proposed new position, {value}, is exactly equal to the current position of the " +
$"given {position.GetType()}, {position.pixels}.\n" +
"The applyBoundaryConditions method should only be called when the value is " +
"going to actually change the pixels, otherwise it is redundant.\n" +
"The physics object in question was:\n" + $" {this}\n" +
"The position object in question was:\n" + $" {position}\n");
}
return(true);
});
if (value < position.pixels && position.pixels <= position.minScrollExtent)
{
return(value - position.pixels);
}
if (position.maxScrollExtent <= position.pixels && position.pixels < value)
{
return(value - position.pixels);
}
if (value < position.minScrollExtent && position.minScrollExtent < position.pixels)
{
return(value - position.minScrollExtent);
}
if (position.pixels < position.maxScrollExtent && position.maxScrollExtent < value)
{
return(value - position.maxScrollExtent);
}
return(0.0);
}
