private static void _SendSelectedLetterAsKeyPress(Boolean delayInput = false)
{
var pos = Caret.GetPosition(_sActiveKeyboardWindow);
var letter = _sActiveSelectorWindow.SelectedLetter;
_HidePopup();
try
{
if (!SetForegroundWindow(_sActiveKeyboardWindow))
{
// Something went wrong, ignore.
return;
}
}
catch (Win32Exception e)
{
// For reasons not yet understood we sometimes get a 0 error code turned into an exception (operation succeeded).
if (e.NativeErrorCode != 0)
{
return;
}
}
var keyboardInput = new KEYBDINPUT();
keyboardInput.wVk = 0; // required by unicode event
keyboardInput.wScan = (Int16)letter;
keyboardInput.dwFlags = KEYEVENTF.UNICODE;
keyboardInput.dwExtraInfo = GetMessageExtraInfo();
keyboardInput.time = 0;
var keyDown = new INPUT();
keyDown.type = INPUT_KEYBOARD;
keyDown.U.ki = keyboardInput;
var keyUp = keyDown;
keyUp.U.ki.dwFlags |= KEYEVENTF.KEYUP;
// If an error happens here it's probably due to UIPI, i.e. the target application is of higher integrity.
// We ignore the error.
if (delayInput)
{
ThreadPool.QueueUserWorkItem(context =>
{
// Just block for a bit.
Thread.Sleep(_kReleaseErrorMargin);
((SynchronizationContext)context).Post(_ =>
{
SendInput(1, new[] { keyDown }, Marshal.SizeOf(keyDown));
SendInput(1, new[] { keyUp }, Marshal.SizeOf(keyDown));
}, null);
}, SynchronizationContext.Current);
}
else
{
SendInput(1, new[] { keyDown, keyUp }, Marshal.SizeOf(keyDown));
SendInput(1, new[] { keyUp }, Marshal.SizeOf(keyDown));
}
}
public static Boolean HandleKeyPress(Boolean isDown, LowLevelListener.KeyHookEventArgs e)
{
if (!_sEnabled)
{
return(false);
}
// If we get here with a letter without our hotkey, exit pronto.
if (e.Key != Key.CapsLock && !e.ModifierCapsLock)
{
return(false);
}
// Check if the letter has changed whilst the popup is showing, in this case we'll show another selector window.
if (_sActiveSelectorWindow != null && _IsLetterPress(e.Key))
{
if (_sActiveSelectorWindow.Key != e.Key)
{
var left = _sActiveSelectorWindow.Left;
var top = _sActiveSelectorWindow.Top;
_HidePopup();
if (!LetterMappings.KeyToWindowMap.TryGetValue(e.Key, out _sActiveSelectorWindow))
{
return(false);
}
_ShowPopup(e.ModifierAnyShift, (Int32)left, (Int32)top);
return(true);
}
}
if (_sActiveSelectorWindow == null)
{
if (e.Key == Key.CapsLock)
{
return(true); // disable capslock
}
if (!LetterMappings.KeyToWindowMap.TryGetValue(e.Key, out _sActiveSelectorWindow))
{
return(false);
}
}
if (_sActiveSelectorWindow == null)
{
return(false);
}
var selectorShowing = _sActiveSelectorWindow.IsVisible;
// Change case if shift is used.
// First we need an additional shift key press to activate it, then we'll handle it as a modifier.
if (e.Key == Key.LeftShift || e.Key == Key.RightShift)
{
if (selectorShowing)
{
if (isDown)
{
_sActiveSelectorWindow.ToUpper();
_sShiftTimer.Restart();
}
else
{
_sActiveSelectorWindow.ToLower();
}
}
return(selectorShowing);
}
else if (selectorShowing && !e.ModifierAnyShift)
{
_sActiveSelectorWindow.ToLower();
}
// If the selector is showing, and this is a down press, go to next key.
if (selectorShowing && isDown && e.Key != Key.CapsLock)
{
if (e.Key == Key.Left || (e.Key != Key.Right && e.ModifierAnyAlt))
{
_sActiveSelectorWindow.SelectPrevious();
}
else
{
_sActiveSelectorWindow.SelectNext();
}
return(true);
}
// If selector is not showing and this is a down press, show it.
if (!selectorShowing && isDown && e.Key != Key.CapsLock)
{
_sActiveKeyboardWindow = GetForegroundWindow();
var position = Caret.GetPosition(_sActiveKeyboardWindow);
// Get the monitor on which we are and see if we need to adjust location to avoid falling off.
IntPtr monitor;
if (position.X == 0 && position.Y == 0)
{
monitor = MonitorFromWindow(_sActiveKeyboardWindow, MONITOR_DEFAULTTONEAREST);
}
else
{
monitor = MonitorFromPoint(position, MONITOR_DEFAULTTONEAREST);
}
// As far as I understand, WPF's coordinates are relative to the default monitor.
// This means that once we've got raw pixels, we need to scale these relative to the DPI of the default
// monitor in order to get WPF coordinates.
// In the below we'll do everything in raw pixels prior to scaling to WPF coordinates.
// The position is measured in dpi of the default monitor.
IntPtr defaultMonitor = MonitorFromPoint(default(Point), MONITOR_DEFAULTTOPRIMARY);
UInt32 mainDpiX, mainDpiY;
Double mainScale = 1.0;
if (GetDpiForMonitor(defaultMonitor, DpiType.EFFECTIVE, out mainDpiX, out mainDpiY) == IntPtr.Zero)
{
// Scale positioning.
mainScale = mainDpiX / 96.0;
}
if (monitor != IntPtr.Zero)
{
// Get monitor size.
MONITORINFO info = new MONITORINFO();
info.cbSize = Marshal.SizeOf(info);
if (GetMonitorInfo(monitor, ref info))
{
// Convert width and height from WPF coordinates to raw pixels using the scale of the default monitor.
var width = _sActiveSelectorWindow.ActualWidth * mainScale;
var height = _sActiveSelectorWindow.ActualHeight * mainScale;
if (position.X == 0 && position.Y == 0)
{
// This can happen in two cases:
// - there is no caret
// - the application does not use win32 caret api
// Slap the popup in the middle of the screen as workaround for now.
position.X = info.rcWork.Left + (info.rcWork.Right - info.rcWork.Left) / 2 - (Int32)(width / 2.0);
position.Y = info.rcWork.Top + (info.rcWork.Bottom - info.rcWork.Top) / 2 - (Int32)(height / 2.0);
}
// Adjust position to fit within the given dimensions.
if (position.X + width > info.rcWork.Right)
{
position.X = info.rcWork.Right - (Int32)width;
}
if (position.Y + height > info.rcWork.Bottom)
{
position.Y = info.rcWork.Bottom - (Int32)height;
}
}
}
// If we got nowhere reasonable to put the popup, mark as handled and don't show it.
if (position.X == 0 && position.Y == 0)
{
return(true);
}
// Finally, convert the position from raw pixels to WPF coordinates.
if (mainScale > 1.0)
{
position.X = (Int32)Math.Round(position.X / mainScale);
position.Y = (Int32)Math.Round(position.Y / mainScale);
}
_ShowPopup(e.ModifierAnyShift, position.X, position.Y);
return(true);
}
// If the selector is showing, mark key as handled.
if (selectorShowing && (e.Key != Key.CapsLock || isDown))
{
return(true);
}
// If the selector is not showing, disable the activator key.
if (!selectorShowing)
{
return(true);
}
// Using the shift key is difficult because the user has to release many keys at once.
// Often the shift key is release slightly before the rest which causes the letters to be
// lower cased just before selecting. We allow a little time interval in which we ignore the shift up.
if (_sShiftTimer.ElapsedMilliseconds < _kReleaseErrorMargin)
{
_sActiveSelectorWindow.ToUpper();
}
// As with the shift key, if the alt key is pressed when the key is sent this really
// sends a alt+key shortcut combination to the target application. We allow for an error
// margin and delay the sending of input if alt is used (but not enough to be really noticable).
// Todo: instead send an alt up?
_SendSelectedLetterAsKeyPress(delayInput: e.ModifierAnyAlt);
return(true);
}