public bool HandleKeyEvent(string name, Keys?key, char?ch, KeyboardModifiers?modifiers = null, bool isVirtual = false, bool isRepeat = false)
{
// HACK to simplify writing input sources
if (name == null)
{
return(false);
}
// HACK: Ensure that key repeat doesn't continue if the original repeat target becomes defocused
var suppressRepeat = isRepeat && (LastNonRepeatKeyPressTarget != Focused);
var evt = new KeyEventArgs {
Context = this,
Modifiers = modifiers ?? CurrentModifiers,
Key = key,
Char = ch,
IsVirtualInput = isVirtual,
IsRepeat = isRepeat && !suppressRepeat
};
if (name == UIEvents.KeyDown)
{
if ((key == Keys.LeftAlt) || (key == Keys.RightAlt))
{
HasPressedKeySincePressingAlt = false;
}
else if (key == Keys.Escape)
{
AcceleratorOverlayVisible = false;
}
else if (key == Keys.Tab)
{
}
else if (key.HasValue && !ModifierKeys.Contains(key.Value))
{
if (evt.Modifiers.Alt)
{
HasPressedKeySincePressingAlt = true;
}
AcceleratorOverlayVisible = false;
}
}
else if (name == UIEvents.KeyUp)
{
if ((key == Keys.LeftAlt) || (key == Keys.RightAlt))
{
if (!HasPressedKeySincePressingAlt)
{
AcceleratorOverlayVisible = !AcceleratorOverlayVisible;
}
}
}
if ((name == UIEvents.KeyPress) && !isRepeat)
{
LastNonRepeatKeyPressTarget = Focused;
}
// FIXME: Suppress events with a char if the target doesn't accept text input?
if (FireEvent(name, Focused, evt, filtersOnly: suppressRepeat))
{
return(true);
}
bool needsToClearFocus = false;
if (name == UIEvents.KeyPress)
{
switch (key)
{
case Keys.Escape:
needsToClearFocus = true;
break;
case Keys.Tab:
int tabDelta = evt.Modifiers.Shift ? -1 : 1;
return(RotateFocus(topLevel: evt.Modifiers.Control, delta: tabDelta, isUserInitiated: true));
case Keys.Space:
if (Focused?.IsValidMouseInputTarget == true)
{
return(FireSyntheticClick(Focused));
}
break;
}
}
if (suppressRepeat)
{
return(false);
}
var activeModal = ActiveModal;
if ((activeModal != null) && activeModal.OnUnhandledKeyEvent(name, evt))
{
return(true);
}
// FIXME: Allow OnKeyEvent to block this?
if (needsToClearFocus)
{
Focused = null;
}
if (OnKeyEvent != null)
{
return(OnKeyEvent(name, key, ch));
}
return(false);
}
