private void DestroyImeWindow(IntPtr hwnd)
{
if (_systemCaret)
{
NativeIME.DestroyCaret();
_systemCaret = false;
}
}
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:
lParam = (IntPtr)(lParam.ToInt64() & ~NativeIME.ISC_SHOWUICOMPOSITIONWINDOW);
NativeIME.DefWindowProc(hwnd, msg, wParam, lParam);
// TODO: should we call ImmNotifyIME?
CreateImeWindow(hwnd);
MoveImeWindow(hwnd);
}
private void Init(HwndSource source)
{
_source = source;
sourceHook = SourceHook;
source.AddHook(SourceHook);
_owner.GotFocus += Owner_GotFocus;
_owner.LostFocus += Owner_LostFocus;
_defaultContext = NativeIME.ImmGetContext(_source.Handle);
_browserContext = NativeIME.ImmCreateContext();
NativeIME.ImmAssociateContext(_source.Handle, _browserContext);
// TODO: need to find a better way to trigger setting context on the window
_owner.Focus();
}
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 == NativeIME.LANG_JAPANESE || _languageCodeId == NativeIME.LANG_CHINESE)
{
if (!_systemCaret)
{
if (NativeIME.CreateCaret(hwnd, IntPtr.Zero, 1, 1))
{
_systemCaret = true;
}
}
}
}
private void MoveImeWindow(IntPtr hwnd)
{
if (!_owner.IsFocused)
{
return;
}
CefSharp.Structs.Rect rc = _imeRect;
int location = _cursorIndex;
// If location is not specified fall back to the composition range start.
if (location == -1)
{
location = _compositionRange.From;
}
// Offset location by the composition range start if required.
if (location >= _compositionRange.From)
{
location -= _compositionRange.From;
}
if (location < _compositionBounds.Count)
{
rc = _compositionBounds[location];
}
else
{
return;
}
int caretMargin = 1;
if (_languageCodeId == NativeIME.LANG_CHINESE)
{
var formPoint = new NativeIME.TagCompositionForm
{
DwStyle = NativeIME.CFS_POINT,
PtCurrentPos = new NativeIME.TagPoint
{
X = rc.X,
Y = rc.Y
},
RcArea = new NativeIME.TagRect
{
Left = rc.X,
Top = rc.Y,
Right = rc.X + rc.Width,
Bottom = rc.Y + rc.Height
}
};
// TODO :: candidate window for Chinese
using (var handler = IMEHandler.Create(hwnd))
{
//NativeIME.ImmSetCompositionWindow(handler._hIMC, ref formPoint);
}
}
if (_systemCaret)
{
if (_languageCodeId == NativeIME.LANG_JAPANESE)
{
var firstRc = _compositionBounds[0];
NativeIME.SetCaretPos(firstRc.X, firstRc.Y + firstRc.Height);
}
else
{
NativeIME.SetCaretPos(rc.X, rc.Y);
}
}
if (_languageCodeId == NativeIME.LANG_KOREAN)
{
rc = new CefSharp.Structs.Rect(rc.X, rc.Y + caretMargin, rc.Width, rc.Height);
}
// Japanese IMEs and Korean IMEs also use the rectangle given to
// ::ImmSetCandidateWindow() with its 'dwStyle' parameter CFS_EXCLUDE
// Therefore, we also set this parameter here.
//Referred from : https://bitbucket.org/chromiumembedded/cef/src/af349ade330c33b669c9ad61cd5000c140968fd7/tests/cefclient/browser/osr_ime_handler_win.cc?at=master&fileviewer=file-view-default#osr_ime_handler_win.cc-206
/*
* CANDIDATEFORM exclude_rectangle = {
* 0,
* CFS_EXCLUDE,
* {rc.x, rc.y},
* {rc.x, rc.y, rc.x + rc.width, rc.y + rc.height}};
* ::ImmSetCandidateWindow(imc, &exclude_rectangle);
*
* ::ImmReleaseContext(hwnd_, imc);
*/
var candidateForm = new NativeIME.TagCandidateForm
{
DwStyle = NativeIME.CFS_EXCLUDE,
PtCurrentPos = new NativeIME.TagPoint
{
X = rc.X,
Y = rc.Y
},
RcArea = new NativeIME.TagRect
{
Left = rc.X,
Top = rc.Y,
Right = rc.X + rc.Width,
Bottom = rc.Y + rc.Height
}
};
using (var handler = IMEHandler.Create(hwnd))
{
NativeIME.ImmSetCandidateWindow(handler._hIMC, ref candidateForm);
}
}
