| private GetCachedSwitchValue ( string switchName, int &switchValue ) : bool | ||
| switchName | string | |
| switchValue | int | |
| return | bool | |
internal static void ValidateLevels()
{
if (levelsValidated)
{
return;
}
bool level1 = !LocalAppContext.GetCachedSwitchValue(UseLegacyAccessibilityFeaturesSwitchName, ref useLegacyAccessibilityFeatures);
bool level2 = !LocalAppContext.GetCachedSwitchValue(UseLegacyAccessibilityFeatures2SwitchName, ref useLegacyAccessibilityFeatures2);
// 4.7.2 accessibility improvements are building upon the infrastructure introduced in 4.7.1,
// thus the application has to opt-in into 4.7.1 level in order to get the 4.7.2 level of support.
if (!level1 && level2)
{
throw new NotSupportedException(SR.GetString(SR.CombinationOfAccessibilitySwitchesNotSupported));
}
// If this code is executed concurrently, in the worst case we'll throw the same exception on each thread.
levelsValidated = true;
}
internal static void ValidateLevels()
{
if (levelsValidated)
{
return;
}
// Level[N+1] accessibility improvements are building upon the infrastructure introduced in Level[N],
// thus the application has to opt-in into Level[N] level in order to get the Level[N+1] level of support.
Tuple <string, Action <int> >[] levelNamesAndSetters =
{
Tuple.Create <string, Action <int> >(UseLegacyAccessibilityFeaturesSwitchName, (switchValue) => useLegacyAccessibilityFeatures = switchValue),
Tuple.Create <string, Action <int> >(UseLegacyAccessibilityFeatures2SwitchName, (switchValue) => useLegacyAccessibilityFeatures2 = switchValue),
Tuple.Create <string, Action <int> >(UseLegacyAccessibilityFeatures3SwitchName, (switchValue) => useLegacyAccessibilityFeatures3 = switchValue)
};
bool higherLevelsAreExpectedToBeDisabled = false;
bool invalidSwitchesCombination = false;
bool[] levelState = new bool[levelNamesAndSetters.Length];
for (int i = 0; i < levelNamesAndSetters.Length; i++)
{
string levelName = levelNamesAndSetters[i].Item1;
Action <int> setLevelSwitchValue = levelNamesAndSetters[i].Item2;
int levelSwitchValue = 0;
bool levelIsDisabled = LocalAppContext.GetCachedSwitchValue(levelName, ref levelSwitchValue);
if (levelIsDisabled)
{
higherLevelsAreExpectedToBeDisabled = true;
}
else if (higherLevelsAreExpectedToBeDisabled)
{
invalidSwitchesCombination = true;
}
setLevelSwitchValue(levelSwitchValue);
levelState[i] = levelIsDisabled;
}
if (invalidSwitchesCombination)
{
#if DEPLOYMENT_NAMESPACE
throw new NotSupportedException(System.Deployment.Application.Resources.GetString("CombinationOfAccessibilitySwitchesNotSupported"));
#else
throw new NotSupportedException(SR.CombinationOfAccessibilitySwitchesNotSupported);
#endif
}
// Get other improvements values
bool useLegacyToolTipDisplay = LocalAppContext.GetCachedSwitchValue(UseLegacyToolTipDisplaySwitchName, ref useLegacyToolTipDisplayBehavior);
// If new ToolTip display behavior is enabled, Level3 should be enabled
if (!useLegacyToolTipDisplay && levelState[2])
{
#if DEPLOYMENT_NAMESPACE
throw new NotSupportedException(System.Deployment.Application.Resources.GetString("KeyboardToolTipDisplayBehaviorRequiresAccessibilityImprovementsLevel3"));
#else
throw new NotSupportedException(SR.KeyboardToolTipDisplayBehaviorRequiresAccessibilityImprovementsLevel3);
#endif
}
// If this code is executed concurrently, in the worst case we'll throw the same exception on each thread.
levelsValidated = true;
}