/// <summary>
/// Get the list of access key targets for the sender of the keyboard event. If sender is null,
/// pretend key was pressed in the active window.
/// </summary>
/// <param name="sender"></param>
/// <param name="key"></param>
/// <returns></returns>
private List <IInputElement> GetTargetsForSender(IInputElement sender, string key)
{
// Find the scope for the sender -- will be matched against the possible targets' scopes
AccessKeyInformation senderInfo = GetInfoForElement(sender, key);
return(GetTargetsForScope(senderInfo.Scope, key, sender, senderInfo));
}
/// <summary>
/// Returns scope for the given element.
/// </summary>
/// <param name="element"></param>
/// <param name="key"></param>
/// <returns>Scope for the given element, null means the context global scope</returns>
private AccessKeyInformation GetInfoForElement(IInputElement element, string key)
{
AccessKeyInformation info = new AccessKeyInformation();
if (element != null)
{
AccessKeyPressedEventArgs args = new AccessKeyPressedEventArgs(key);
element.RaiseEvent(args);
info.Scope = args.Scope;
info.target = args.Target;
if (info.Scope == null)
{
info.Scope = GetSourceForElement(element);
}
}
else
{
info.Scope = CriticalGetActiveSource();
}
return(info);
}
private List <IInputElement> GetTargetsForScope(object scope, string key, IInputElement sender, AccessKeyInformation senderInfo)
{
// null scope defaults to the active window
if (scope == null)
{
scope = CriticalGetActiveSource();
// if there is no active scope then give up
if (scope == null)
{
return(null);
}
}
if (CoreCompatibilityPreferences.GetIsAltKeyRequiredInAccessKeyDefaultScope() &&
(scope is PresentationSource) && (Keyboard.Modifiers & ModifierKeys.Alt) != ModifierKeys.Alt)
{
// If AltKey is required and it isnt pressed then dont match against any targets
return(null);
}
//Scoping:
// 1) When key is pressed, find matching AKs -> S
// 3) find scope for keyevent.Source
// 4) find scope for everything in S. throw away those that don't match.
// 5) Final selection uses S. yay!
//
//
List <IInputElement> possibleElements;
lock (_keyToElements)
{
possibleElements = CopyAndPurgeDead(_keyToElements[key] as ArrayList);
}
if (possibleElements == null)
{
return(null);
}
List <IInputElement> finalTargets = new List <IInputElement>(1);
// Go through all the possible elements, find the interesting candidates
for (int i = 0; i < possibleElements.Count; i++)
{
IInputElement element = possibleElements[i];
if (element != sender)
{
if (IsTargetable(element))
{
AccessKeyInformation elementInfo = GetInfoForElement(element, key);
if (elementInfo.target == null)
{
continue;
}
if (scope == elementInfo.Scope)
{
finalTargets.Add(elementInfo.target);
}
}
}
else
{
// This is the same element that sent the event so it must be in the same scope.
// Just add it to the final targets
if (senderInfo.target != null)
{
finalTargets.Add(senderInfo.target);
}
}
}
return(finalTargets);
}
private AccessKeyInformation GetInfoForElement(IInputElement element, string key)
{
AccessKeyInformation info = new AccessKeyInformation();
if (element != null)
{
AccessKeyPressedEventArgs args = new AccessKeyPressedEventArgs(key);
element.RaiseEvent(args);
info.Scope = args.Scope;
info.target = args.Target;
if (info.Scope == null)
{
info.Scope = GetSourceForElement(element);
}
}
else
{
info.Scope = CriticalGetActiveSource();
}
return info;
}
private List<IInputElement> GetTargetsForScope(object scope, string key, IInputElement sender, AccessKeyInformation senderInfo)
{
// null scope defaults to the active window
if (scope == null)
{
scope = CriticalGetActiveSource();
// if there is no active scope then give up
if (scope == null)
{
return null;
}
}
if (CoreCompatibilityPreferences.GetIsAltKeyRequiredInAccessKeyDefaultScope() &&
(scope is PresentationSource) && (Keyboard.Modifiers & ModifierKeys.Alt) != ModifierKeys.Alt)
{
// If AltKey is required and it isnt pressed then dont match against any targets
return null;
}
//Scoping:
// 1) When key is pressed, find matching AKs -> S
// 3) find scope for keyevent.Source
// 4) find scope for everything in S. throw away those that don't match.
// 5) Final selection uses S. yay!
//
//
List<IInputElement> possibleElements;
lock (_keyToElements)
{
possibleElements = CopyAndPurgeDead(_keyToElements[key] as ArrayList);
}
if (possibleElements == null) return null;
List<IInputElement> finalTargets = new List<IInputElement>(1);
// Go through all the possible elements, find the interesting candidates
for (int i = 0; i < possibleElements.Count; i++)
{
IInputElement element = possibleElements[i];
if (element != sender)
{
if (IsTargetable(element))
{
AccessKeyInformation elementInfo = GetInfoForElement(element, key);
if (elementInfo.target == null) continue;
if (scope == elementInfo.Scope)
{
finalTargets.Add(elementInfo.target);
}
}
}
else
{
// This is the same element that sent the event so it must be in the same scope.
// Just add it to the final targets
if (senderInfo.target != null)
{
finalTargets.Add(senderInfo.target);
}
}
}
return finalTargets;
}
