private static void OnAccessKeyPressed(object sender, AccessKeyPressedEventArgs e)
{
if (!e.Handled && e.Scope == null && e.Target == null)
{
e.Target = sender as GroupBox;
}
}
private void OnAccessKeyPressed(object sender, System.Windows.Input.AccessKeyPressedEventArgs e)
{
string rawKey = e.Key;
if (Int32.TryParse(rawKey, out int index))
{
rawKey = $"D{index}";
}
if (Enum.TryParse(rawKey, out Key pressed) && pressed != Key.None)
{
AccessKeyPressingEventArgs args = new AccessKeyPressingEventArgs(keys, pressed);
if (pressingHandler != null)
{
pressingHandler(window, args);
}
if (!args.IsCancelled)
{
keys.Add(pressed);
}
e.Handled = true;
}
}
private void accessKeyPressed(object sender, System.Windows.Input.AccessKeyPressedEventArgs e)
{
if (Keyboard.Modifiers != ModifierKeys.Alt)
{
e.Scope = sender;
e.Handled = true;
}
}
private static void HandleScopedElementAccessKeyPressed(object sender, AccessKeyPressedEventArgs e)
{
if (!Keyboard.IsKeyDown(Key.LeftAlt) && !Keyboard.IsKeyDown(Key.RightAlt) && GetIsAccessKeyScope((DependencyObject)sender))
{
e.Scope = sender;
e.Handled = true;
}
}
/// <summary>
/// Fixes access key scoping bug within the WPF framework.
/// </summary>
/// <param name="sender">Potential target of the current access keys.</param>
/// <param name="e">
/// Info object for the current access keys and proxy to effect it's confirmation.
/// </param>
/// <remarks>
/// The problem is that all access key presses are scoped to the active window,
/// regardless of what properties, handlers, scope etc. you may have set. Targets
/// are objects that have potential to be the target of the access keys in effect.
///
/// If you happen to have a current object focused and you press the access keys
/// of one of it's child's targets it will execute the child target. But, if you
/// also have a ancestor target, the ancestor target will be executed instead.
/// That goes against intuition and standard Windows behavior.
/// The root of this logic (bug) is within the HwndSource.OnMnemonicCore method.
/// If the scope is set to anything but the active window's HwndSource, the
/// target will not be executed and the handler for the next target in the chain
/// will be called.
/// This handler gets called for every target within the scope, which because
/// of the bug is always at the window level of the active window. If you set
/// e.Handled to true, no further handlers in the chain will be executed. However
/// because setting the scope to anything other than active window's HwndSource
/// causes the target not to be acted on, we can use it to not act on the target
/// while not canceling the chain either, thereby allowing us to skip to the next
/// target's handler. Note that if a handler does act on the target it will
/// inheritably break the chain because the menu will lose focus and the next
/// handlers won't apply anymore; because a target has already been confirmed.
/// We will use this knowledge to resolve the issue.
/// We will set the scope to something other than the active window's HwndSource,
/// if we find that the incorrect element is being targeted for the access keys
/// (because the target is out of scope). This will cause the target to be
/// skipped and the next target's handler will be called.
/// If we detect the target is correct, we'll just leave everything alone so the
/// target will be confirmed.
///
/// NOTE: Do not call AccessKeyManager.IsKeyRegistered as it will cause a
/// <see cref="T:System.StackOverflowException"/> to be thrown. The key is
/// registered otherwise this handler wouldn't be called for it, therefore
/// there is no need to call it.
/// </remarks>
private static void HandleAccessKeyPressed(object sender, AccessKeyPressedEventArgs e)
{
var focusedElement = Keyboard.FocusedElement as FrameworkElement;
if (focusedElement == null)
return; // No focused element.
if (Equals(sender, focusedElement))
return; // This is the correct target.
// Look through descendants tree to see if this target is a descendant of
// the focused element. We will stop looking at either the end of the tree
// or if a object with multiple children is encountered that this target
// isn't a descendant of.
// If no valid target is found, we'll set the scope to the sender which
// results in skipping to the next target handler in the chain
// (due to the bug).
DependencyObject obj = focusedElement;
while (obj != null)
{
int childCount = VisualTreeHelper.GetChildrenCount(obj);
for (int i = 0; i < childCount; i++)
{
if (VisualTreeHelper.GetChild(obj, i) == sender)
return; // Found correct target; let it execute.
}
if (childCount > 1)
{
// This target isn't a direct descendant and there are multiple
// direct descendants; skip this target.
e.Scope = sender;
return;
}
if (childCount == 1)
{
// This target isn't a direct descendant, but we'll keep looking
// down the descendants chain to see if it's a descendant of the
// direct descendant.
obj = VisualTreeHelper.GetChild(obj, 0);
}
else
{
// End of the line; skip this target.
e.Scope = sender;
return;
}
}
}
/// <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 string GetAccessKeyCharacter(DependencyObject d)
{
// See what the local value for AccessKeyElement is first and start with that.
WeakReference cachedElementWeakRef = (WeakReference)d.GetValue(AccessKeyElementProperty);
IInputElement accessKeyElement = (cachedElementWeakRef != null) ? (IInputElement)cachedElementWeakRef.Target : null;
if (accessKeyElement != null)
{
// First figure out if the target of accessKeyElement is still "d", then go find
// the "primary" character for the accessKeyElement.
AccessKeyPressedEventArgs accessKeyPressedEventArgs = new AccessKeyPressedEventArgs();
accessKeyElement.RaiseEvent(accessKeyPressedEventArgs);
if (accessKeyPressedEventArgs.Target == d)
{
// Because there is no way to get at the access key element's character from the
// element (there is no interface or anything) we have to go through all registered
// access keys and see if this access key element is still registered and what its
// "primary" character is.
foreach (DictionaryEntry entry in Current._keyToElements)
{
ArrayList elements = (ArrayList)entry.Value;
for (int i = 0; i < elements.Count; i++)
{
// If this element matches accessKeyElement, then return the current character
WeakReference currentElementWeakRef = (WeakReference)elements[i];
if (currentElementWeakRef.Target == accessKeyElement)
{
return (string)entry.Key;
}
}
}
}
}
// There was no access key stored or it no longer matched. Clear out the cache and figure it out again.
d.ClearValue(AccessKeyElementProperty);
foreach (DictionaryEntry entry in Current._keyToElements)
{
ArrayList elements = (ArrayList)entry.Value;
for (int i = 0; i < elements.Count; i++)
{
// Determine the target for this element. Cache the weak reference for the element on the target.
WeakReference currentElementWeakRef = (WeakReference)elements[i];
IInputElement currentElement = (IInputElement)currentElementWeakRef.Target;
if (currentElement != null)
{
AccessKeyPressedEventArgs accessKeyPressedEventArgs = new AccessKeyPressedEventArgs();
currentElement.RaiseEvent(accessKeyPressedEventArgs);
// If the target was non-null, cache the access key element on the target.
// if the target matches "d", return the current character.
if (accessKeyPressedEventArgs.Target != null)
{
accessKeyPressedEventArgs.Target.SetValue(AccessKeyElementProperty, currentElementWeakRef);
if (accessKeyPressedEventArgs.Target == d)
{
return (string)entry.Key;
}
}
}
}
}
return String.Empty;
}
/// <summary>
/// This is overridden to pass hot keys on to the contained user control.
/// </summary>
/// <param name="m">The message to pre-process</param>
/// <returns>True if the message was handled, false if not</returns>
/// <remarks>When a WPF user control is hosted in a docked tool window, the hot keys no longer work.
/// This works around the problem by manually seeing if the control makes use of the hot key, and if
/// it does, processing it here.</remarks>
protected override bool PreProcessMessage(ref System.Windows.Forms.Message m)
{
if(m.Msg == 0x0100 /* WM_KEYDOWN */)
{
System.Windows.Forms.Keys keyCode = (System.Windows.Forms.Keys)m.WParam &
System.Windows.Forms.Keys.KeyCode;
if(keyCode == System.Windows.Forms.Keys.F1)
{
ApplicationCommands.Help.Execute(null, (UserControl)base.Content);
return true;
}
}
if(m.Msg == 0x0104 /*WM_SYSKEYDOWN*/)
{
if(Keyboard.IsKeyDown(Key.LeftAlt) || Keyboard.IsKeyDown(Key.RightAlt))
{
// Cache a copy of the scope on first use
if(scope == null && base.Content != null)
{
// Get the scope for handling hot keys. The key used here doesn't matter. We're just
// getting the scope to use.
AccessKeyPressedEventArgs e = new AccessKeyPressedEventArgs("X");
((UserControl)base.Content).RaiseEvent(e);
scope = e.Scope;
}
string key = ((char)m.WParam).ToString();
// See if the hot key is registered for the control. If so, handle it. Ignore Alt+F4 though
// as it should close Visual Studio (it comes through as a lowercase "s").
if(scope != null && key != "s" && AccessKeyManager.IsKeyRegistered(scope, key))
{
AccessKeyManager.ProcessKey(scope, key, false);
return true;
}
}
}
return base.PreProcessMessage(ref m);
}
private string GetAccessKeyCharacter(DependencyObject d)
{
// See what the local value for AccessKeyElement is first and start with that.
WeakReference cachedElementWeakRef = (WeakReference)d.GetValue(AccessKeyElementProperty);
IInputElement accessKeyElement = (cachedElementWeakRef != null) ? (IInputElement)cachedElementWeakRef.Target : null;
if (accessKeyElement != null)
{
// First figure out if the target of accessKeyElement is still "d", then go find
// the "primary" character for the accessKeyElement.
AccessKeyPressedEventArgs accessKeyPressedEventArgs = new AccessKeyPressedEventArgs();
accessKeyElement.RaiseEvent(accessKeyPressedEventArgs);
if (accessKeyPressedEventArgs.Target == d)
{
// Because there is no way to get at the access key element's character from the
// element (there is no interface or anything) we have to go through all registered
// access keys and see if this access key element is still registered and what its
// "primary" character is.
foreach (DictionaryEntry entry in Current._keyToElements)
{
ArrayList elements = (ArrayList)entry.Value;
for (int i = 0; i < elements.Count; i++)
{
// If this element matches accessKeyElement, then return the current character
WeakReference currentElementWeakRef = (WeakReference)elements[i];
if (currentElementWeakRef.Target == accessKeyElement)
{
return((string)entry.Key);
}
}
}
}
}
// There was no access key stored or it no longer matched. Clear out the cache and figure it out again.
d.ClearValue(AccessKeyElementProperty);
foreach (DictionaryEntry entry in Current._keyToElements)
{
ArrayList elements = (ArrayList)entry.Value;
for (int i = 0; i < elements.Count; i++)
{
// Determine the target for this element. Cache the weak reference for the element on the target.
WeakReference currentElementWeakRef = (WeakReference)elements[i];
IInputElement currentElement = (IInputElement)currentElementWeakRef.Target;
if (currentElement != null)
{
AccessKeyPressedEventArgs accessKeyPressedEventArgs = new AccessKeyPressedEventArgs();
currentElement.RaiseEvent(accessKeyPressedEventArgs);
// If the target was non-null, cache the access key element on the target.
// if the target matches "d", return the current character.
if (accessKeyPressedEventArgs.Target != null)
{
accessKeyPressedEventArgs.Target.SetValue(AccessKeyElementProperty, currentElementWeakRef);
if (accessKeyPressedEventArgs.Target == d)
{
return((string)entry.Key);
}
}
}
}
}
return(String.Empty);
}
private static void OnAccessKeyPressed(object sender, AccessKeyPressedEventArgs e)
{
if (!e.Handled && e.Scope == null && e.Target == null)
{
e.Target = (UIElement)sender;
}
}
//--------------------------------------------------------------
private static void OnAccessKeyPressed(object sender, AccessKeyPressedEventArgs eventArgs)
{
// This code is borrowed from the WPF TabItem.
if (!eventArgs.Handled && eventArgs.Scope == null)
{
var dockTabItem = (DockTabItem)sender;
if (eventArgs.Target == null)
{
eventArgs.Target = dockTabItem;
}
else if (!dockTabItem.IsSelected) // If DockTabItem is not active it is a scope for its content elements.
{
eventArgs.Scope = dockTabItem;
eventArgs.Handled = true;
}
}
}
// custom event to work around .NET bug to prevent access key fireup without ALT key pressed
private static void OnAccessKeyPressed(object sender, AccessKeyPressedEventArgs e)
{
// allowing default for enter and escape keys
if (Keyboard.IsKeyDown(Key.Enter) || Keyboard.IsKeyDown(Key.Escape))
return;
if (!e.Handled && e.Scope == null && (e.Target == null || e.Target is Label))
{
// If Alt key is not pressed - handle the event
if ((Keyboard.Modifiers & ModifierKeys.Alt) != ModifierKeys.Alt)
{
e.Target = null;
e.Handled = true;
}
}
}
void GridAccessKeyPressed(object sender, AccessKeyPressedEventArgs e)
{
throw new NotImplementedException();
}
private void UpdateIsDefaulted(IInputElement focus)
{
// If it's not a default button, or nothing is focused, or it's disabled then it's not defaulted.
if (!IsDefault || focus == null || !IsEnabled)
{
SetValue(IsDefaultedPropertyKey, BooleanBoxes.FalseBox);
return;
}
DependencyObject focusDO = focus as DependencyObject;
object thisScope, focusScope;
// If the focused thing is not in this scope then IsDefaulted = false
AccessKeyPressedEventArgs e;
object isDefaulted = BooleanBoxes.FalseBox;
try
{
// Step 1: Determine the AccessKey scope from currently focused element
e = new AccessKeyPressedEventArgs();
focus.RaiseEvent(e);
focusScope = e.Scope;
// Step 2: Determine the AccessKey scope from this button
e = new AccessKeyPressedEventArgs();
this.RaiseEvent(e);
thisScope = e.Scope;
// Step 3: Compare scopes
if (thisScope == focusScope && (focusDO == null || (bool)focusDO.GetValue(KeyboardNavigation.AcceptsReturnProperty) == false))
{
isDefaulted = BooleanBoxes.TrueBox;
}
}
finally
{
SetValue(IsDefaultedPropertyKey, isDefaulted);
}
}
private static void OnAccessKeyPressed(object sender, AccessKeyPressedEventArgs e)
{
Label label = sender as Label;
// ISSUE: if this is handled in Control then we need to check here as well
if (!e.Handled && e.Scope == null && (e.Target == null || e.Target == label))
{
e.Target = label.Target;
}
}
private void OnAccessKeyPressed(object sender, AccessKeyPressedEventArgs args)
{
foreach (string accessKey in _renameAccessKeys)
{
if (string.Compare(accessKey, args.Key, StringComparison.OrdinalIgnoreCase) == 0)
{
args.Target = this;
args.Handled = true;
return;
}
}
}
private static void OnAccessKeyPressed(object sender, AccessKeyPressedEventArgs e)
{
MenuItem menuItem = sender as MenuItem;
bool isScope = false;
if (e.Target == null)
{
// MenuItem access key should not work if something else beside MenuBase has capture
if (Mouse.Captured == null || Mouse.Captured is MenuBase)
{
e.Target = menuItem;
// special case is if we are the original source and our submenu is open,
// this is the case where the mouse moved over the header and focus is on
// the menu item but really you want to access key processing to be in your
// submenu.
// This assumes that no one will ever directly register a MenuItem with the AKM.
if (e.OriginalSource == menuItem && menuItem.IsSubmenuOpen)
{
isScope = true;
}
}
else
{
e.Handled = true;
}
}
else if (e.Scope == null)
{
// We want menu items to be a scope, but not for any AKs in its header.
// If e.Target is already filled in, check if it's a MenuItem.
// If it is and it's not us, we are its scope (i.e. we're the first MenuItem
// above it in the chain). If it's not a MenuItem, we have to take the long way.
if (e.Target != menuItem && e.Target is MenuItem)
{
isScope = true;
}
else
{
// This case handles when you have some non-MenuItem in a menu that can be
// the target of access keys, like a Button.
// MenuItems are a scope for all access keys which are outside of themselves.
// e.Source is the logical element in which the event was raised.
// If we can walk from the source to ourselves, then we are not correct
// scope of this access key; some parent should be.
DependencyObject source = e.Source as DependencyObject;
while (source != null)
{
// If we walk up to this Menuitem, we are not the scope.
if (source == menuItem)
{
break;
}
UIElement uiElement = source as UIElement;
// If we walk up to an item which is one of our children, we are their scope.
if ((uiElement != null) && (ItemsControlFromItemContainer(uiElement) == menuItem))
{
isScope = true;
break;
}
source = GetFrameworkParent(source);
}
}
}
if (isScope)
{
e.Scope = menuItem;
e.Handled = true;
}
}
/// <summary>
/// This is overridden to pass hot keys on to the contained user control.
/// </summary>
/// <param name="m">The message to pre-process</param>
/// <returns>True if the message was handled, false if not</returns>
/// <remarks>When a WPF user control is hosted in a docked tool window, the hot keys no longer
/// work. This works around the problem by manually seeing if the control makes use of the
/// hot key, and if it does, processing it here.</remarks>
protected override bool PreProcessMessage(ref System.Windows.Forms.Message m)
{
if(m.Msg == 0x0100 /* WM_KEYDOWN */)
{
System.Windows.Forms.Keys keyCode = (System.Windows.Forms.Keys)m.WParam &
System.Windows.Forms.Keys.KeyCode;
if(keyCode == System.Windows.Forms.Keys.F1)
{
ApplicationCommands.Help.Execute(null, ucTopicPreviewer);
return true;
}
}
if(m.Msg == 0x0104 /*WM_SYSKEYDOWN*/)
{
if(Keyboard.IsKeyDown(Key.LeftAlt) || Keyboard.IsKeyDown(Key.RightAlt))
{
// Cache a copy of the scope on first use
if(scope == null && base.Content != null)
{
// Get the scope for handling hot keys. The key used here doesn't matter.
// We're just getting the scope to use.
AccessKeyPressedEventArgs e = new AccessKeyPressedEventArgs("X");
ucTopicPreviewer.RaiseEvent(e);
scope = e.Scope;
}
string key = ((char)m.WParam).ToString();
// See if the hot key is registered for the control. If so, handle it.
if(scope != null && AccessKeyManager.IsKeyRegistered(scope, key))
{
AccessKeyManager.ProcessKey(scope, key, false);
return true;
}
}
}
return base.PreProcessMessage(ref m);
}
//-------------------------------------------------------------------
//
// Private Methods
//
//-------------------------------------------------------------------
#region Private Methods
private static void OnAccessKeyPressed(object sender, AccessKeyPressedEventArgs e)
{
if (!e.Handled && e.Scope == null)
{
TabItem tabItem = sender as TabItem;
if (e.Target == null)
{
e.Target = tabItem;
}
else if (!tabItem.IsSelected) // If TabItem is not active it is a scope for its content elements
{
e.Scope = tabItem;
e.Handled = true;
}
}
}
//--------------------------------------------------------------
private static void OnAccessKeyPressed(object sender, AccessKeyPressedEventArgs eventArgs)
{
if (eventArgs.Handled || eventArgs.Scope != null)
return;
var focusedElement = Keyboard.FocusedElement as FrameworkElement;
if (focusedElement == null)
return;
// Do not accept access keys that originated outside of the DockTabPane.
var dockTabPane = (DockTabPane)sender;
if (!dockTabPane.IsVisualAncestorOf(focusedElement))
{
// Do not set eventArgs.Handled because this would break the chain.
// --> Setting the scope skips the current target.
eventArgs.Scope = dockTabPane;
// See DigitalRune.Windows.AccessKeyScope for additional information!
}
}
//-------------------------------------------------------------------
//
// Private Methods
//
//-------------------------------------------------------------------
#region Private Methods
private static void OnAccessKeyPressed(object sender, AccessKeyPressedEventArgs e)
{
// If ALT is down, then blend our scope into the one above. Maybe bad, but only if Menu is not top-level.
if (!(Keyboard.IsKeyDown(Key.LeftAlt) || Keyboard.IsKeyDown(Key.RightAlt)))
{
e.Scope = sender;
e.Handled = true;
}
}
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 static void OnAccessKeyPressed(object sender, AccessKeyPressedEventArgs e)
{
e.Scope = sender;
e.Handled = true;
}
private void Window_AccessKeyPressed(object sender, System.Windows.Input.AccessKeyPressedEventArgs e)
{
}
