public static CupertinoUserInterfaceLevelData?of(BuildContext context, bool nullOk = false)
{
D.assert(context != null);
CupertinoUserInterfaceLevel query = context.dependOnInheritedWidgetOfExactType <CupertinoUserInterfaceLevel>(null);
if (query != null)
{
return(query._data);
}
if (nullOk)
{
return(null);
}
throw new UIWidgetsError(
"CupertinoUserInterfaceLevel.of() called with a context that does not contain a CupertinoUserInterfaceLevel.\n" +
"No CupertinoUserInterfaceLevel ancestor could be found starting from the context that was passed " +
"to CupertinoUserInterfaceLevel.of(). This can happen because you do not have a WidgetsApp or " +
"MaterialApp widget (those widgets introduce a CupertinoUserInterfaceLevel), or it can happen " +
"if the context you use comes from a widget above those widgets.\n" +
"The context used was:\n" +
context.ToString()
);
}
public CupertinoDynamicColor resolveFrom(BuildContext context, bool nullOk = true)
{
Brightness brightness = _isPlatformBrightnessDependent
? CupertinoTheme.brightnessOf(context, nullOk: nullOk) ?? Brightness.light
: Brightness.light;
bool isHighContrastEnabled = _isHighContrastDependent &&
(MediaQuery.of(context, nullOk: nullOk)?.highContrast ?? false);
CupertinoUserInterfaceLevelData level = _isInterfaceElevationDependent
? CupertinoUserInterfaceLevel.of(context, nullOk: nullOk) ?? CupertinoUserInterfaceLevelData.baselayer
: CupertinoUserInterfaceLevelData.baselayer;
Color resolved = null;
switch (brightness)
{
case Brightness.light:
switch (level)
{
case CupertinoUserInterfaceLevelData.baselayer:
resolved = isHighContrastEnabled ? highContrastColor : color;
break;
case CupertinoUserInterfaceLevelData.elevatedlayer:
resolved = isHighContrastEnabled ? highContrastElevatedColor : elevatedColor;
break;
}
break;
case Brightness.dark:
switch (level)
{
case CupertinoUserInterfaceLevelData.baselayer:
resolved = isHighContrastEnabled ? darkHighContrastColor : darkColor;
break;
case CupertinoUserInterfaceLevelData.elevatedlayer:
resolved = isHighContrastEnabled ? darkHighContrastElevatedColor : darkElevatedColor;
break;
}
break;
}
Element _debugContext = null;
D.assert(() => {
_debugContext = context as Element;
return(true);
}
);
return(new CupertinoDynamicColor(
debugLabel: _debugLabel,
effectiveColor: resolved,
color: color,
darkColor: darkColor,
highContrastColor: highContrastColor,
darkHighContrastColor: darkHighContrastColor,
elevatedColor: color,
darkElevatedColor: darkColor,
highContrastElevatedColor: highContrastColor,
darkHighContrastElevatedColor: darkHighContrastColor,
debugResolveContext: null
));
}