private void DestroyImeWindow(IntPtr hwnd)
{
if (systemCaret)
{
ImeNative.DestroyCaret();
systemCaret = false;
}
}
private void CloseImeComposition()
{
if (hasImeComposition)
{
// Set focus to 0, which destroys IME suggestions window.
ImeNative.SetFocus(IntPtr.Zero);
// Restore focus.
ImeNative.SetFocus(source.Handle);
}
}
private void OnImeSetContext(IntPtr hwnd, uint msg, IntPtr wParam, IntPtr lParam)
{
// We handle the IME Composition Window ourselves (but let the IME Candidates
// Window be handled by IME through DefWindowProc()), so clear the
// ISC_SHOWUICOMPOSITIONWINDOW flag:
ImeNative.DefWindowProc(hwnd, msg, wParam, (IntPtr)(lParam.ToInt64() & ~ImeNative.ISC_SHOWUICOMPOSITIONWINDOW));
// TODO: should we call ImmNotifyIME?
CreateImeWindow(hwnd);
MoveImeWindow(hwnd);
}
private void CreateImeWindow(IntPtr hwnd)
{
// Chinese/Japanese IMEs somehow ignore function calls to
// ::ImmSetCandidateWindow(), and use the position of the current system
// caret instead -::GetCaretPos().
// Therefore, we create a temporary system caret for Chinese IMEs and use
// it during this input context.
// Since some third-party Japanese IME also uses ::GetCaretPos() to determine
// their window position, we also create a caret for Japanese IMEs.
languageCodeId = PrimaryLangId(InputLanguageManager.Current.CurrentInputLanguage.KeyboardLayoutId);
if (languageCodeId == ImeNative.LANG_JAPANESE || languageCodeId == ImeNative.LANG_CHINESE)
{
if (!systemCaret)
{
if (ImeNative.CreateCaret(hwnd, IntPtr.Zero, 1, 1))
{
systemCaret = true;
}
}
}
}
private void MoveImeWindow(IntPtr hwnd)
{
if (compositionBounds.Count == 0)
{
return;
}
var hIMC = ImeNative.ImmGetContext(hwnd);
var rc = compositionBounds[0];
var x = rc.X + rc.Width;
var y = rc.Y + rc.Height;
const int kCaretMargin = 1;
// As written in a comment in ImeInput::CreateImeWindow(),
// Chinese IMEs ignore function calls to ::ImmSetCandidateWindow()
// when a user disables TSF (Text Service Framework) and CUAS (Cicero
// Unaware Application Support).
// On the other hand, when a user enables TSF and CUAS, Chinese IMEs
// ignore the position of the current system caret and uses the
// parameters given to ::ImmSetCandidateWindow() with its 'dwStyle'
// parameter CFS_CANDIDATEPOS.
// Therefore, we do not only call ::ImmSetCandidateWindow() but also
// set the positions of the temporary system caret if it exists.
var candidatePosition = new ImeNative.CANDIDATEFORM
{
dwIndex = 0,
dwStyle = (int)ImeNative.CFS_CANDIDATEPOS,
ptCurrentPos = new ImeNative.POINT(x, y),
rcArea = new ImeNative.RECT(0, 0, 0, 0)
};
ImeNative.ImmSetCandidateWindow(hIMC, ref candidatePosition);
if (systemCaret)
{
ImeNative.SetCaretPos(x, y);
}
if (languageCodeId == ImeNative.LANG_KOREAN)
{
// Chinese IMEs and Japanese IMEs require the upper-left corner of
// the caret to move the position of their candidate windows.
// On the other hand, Korean IMEs require the lower-left corner of the
// caret to move their candidate windows.
y += kCaretMargin;
}
// Japanese IMEs and Korean IMEs also use the rectangle given to
// ::ImmSetCandidateWindow() with its 'dwStyle' parameter CFS_EXCLUDE
// to move their candidate windows when a user disables TSF and CUAS.
// Therefore, we also set this parameter here.
var excludeRectangle = new ImeNative.CANDIDATEFORM
{
dwIndex = 0,
dwStyle = (int)ImeNative.CFS_EXCLUDE,
ptCurrentPos = new ImeNative.POINT(x, y),
rcArea = new ImeNative.RECT(rc.X, rc.Y, x, y + kCaretMargin)
};
ImeNative.ImmSetCandidateWindow(hIMC, ref excludeRectangle);
ImeNative.ImmReleaseContext(hwnd, hIMC);
}