// Set candidate window position.
// Borrowed from https://github.com/chromium/chromium/blob/master/ui/base/ime/win/imm32_manager.cc
public void SetCandidateWindow(TsfSharp.Rect caretRect)
{
int x = caretRect.Left;
int y = caretRect.Top;
if (PRIMARYLANGID(_inputLanguageId) == LANG_CHINESE)
{
// 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.
var candidateForm = new NativeMethods.CANDIDATEFORM();
candidateForm.dwStyle = NativeMethods.CFS_CANDIDATEPOS;
candidateForm.ptCurrentPos.X = x;
candidateForm.ptCurrentPos.Y = y;
NativeMethods.ImmSetCandidateWindow(_defaultImc, ref candidateForm);
}
if (PRIMARYLANGID(_inputLanguageId) == LANG_JAPANESE)
{
NativeMethods.SetCaretPos(x, caretRect.Bottom);
}
else
{
NativeMethods.SetCaretPos(x, y);
}
// Set composition window position also to ensure move the candidate window position.
var compositionForm = new NativeMethods.COMPOSITIONFORM();
compositionForm.dwStyle = NativeMethods.CFS_POINT;
compositionForm.ptCurrentPos.X = x;
compositionForm.ptCurrentPos.Y = y;
NativeMethods.ImmSetCompositionWindow(_defaultImc, ref compositionForm);
if (PRIMARYLANGID(_inputLanguageId) == 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;
}
// Need to return here since some Chinese IMEs would stuck if set
// candidate window position with CFS_EXCLUDE style.
if (PRIMARYLANGID(_inputLanguageId) == LANG_CHINESE)
{
return;
}
// 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 NativeMethods.CANDIDATEFORM();
compositionForm.dwStyle = NativeMethods.CFS_EXCLUDE;
compositionForm.ptCurrentPos.X = x;
compositionForm.ptCurrentPos.Y = y;
compositionForm.rcArea.Left = x;
compositionForm.rcArea.Top = y;
compositionForm.rcArea.Right = caretRect.Right;
compositionForm.rcArea.Bottom = caretRect.Bottom;
NativeMethods.ImmSetCandidateWindow(_defaultImc, ref excludeRectangle);
}
/// <summary>
/// 候補文字ウィンドウの位置を設定
/// </summary>
/// <param name="hWnd"></param>
private void SetCandidateWindowPos(IntPtr hWnd)
{
IntPtr hImc = NativeMethods.ImmGetContext(hWnd);
if (hImc != null)
{
NativeMethods.CANDIDATEFORM cndFrm = new NativeMethods.CANDIDATEFORM();
cndFrm.ptCurrentPos.X = caret.GetPos().X;
cndFrm.ptCurrentPos.Y = caret.GetPos().Y;
cndFrm.dwStyle = NativeMethods.CFS_CANDIDATEPOS;// 候補文字ウィンドウの位置を指定する。
NativeMethods.ImmSetCandidateWindow(hImc, ref cndFrm);
NativeMethods.ImmReleaseContext(hWnd, hImc);
}
}
private void OnWmImeNotify(IntPtr hwnd, IntPtr wParam)
{
IntPtr himc;
// we don't have to do anything if _editor is null.
if (!IsInKeyboardFocus)
{
return;
}
if ((int)wParam == NativeMethods.IMN_OPENCANDIDATE)
{
himc = UnsafeNativeMethods.ImmGetContext(new HandleRef(this, hwnd));
if (himc != IntPtr.Zero)
{
NativeMethods.CANDIDATEFORM candform = new NativeMethods.CANDIDATEFORM();
//
// At IMN_OPENCANDIDATE, we need to set the candidate window location to hIMC.
//
if (IsReadingWindowIme())
{
// Level 2 for Chinese legacy IMEs.
// We have already set the composition form. The candidate window will follow it.
candform.dwIndex = 0;
candform.dwStyle = NativeMethods.CFS_DEFAULT;
candform.rcArea.left = 0;
candform.rcArea.right = 0;
candform.rcArea.top = 0;
candform.rcArea.bottom = 0;
candform.ptCurrentPos = new NativeMethods.POINT(0, 0);
}
else
{
ITextView view;
ITextPointer startNavigator;
ITextPointer endNavigator;
ITextPointer caretNavigator;
GeneralTransform transform;
Point milPointTopLeft;
Point milPointBottomRight;
Point milPointCaret;
Rect rectStart;
Rect rectEnd;
Rect rectCaret;
CompositionTarget compositionTarget;
compositionTarget = _source.CompositionTarget;
if (_startComposition != null)
{
startNavigator = _startComposition.CreatePointer();
}
else
{
startNavigator = _editor.Selection.Start.CreatePointer();
}
if (_endComposition != null)
{
endNavigator = _endComposition.CreatePointer();
}
else
{
endNavigator = _editor.Selection.End.CreatePointer();
}
if (_startComposition != null)
{
caretNavigator = _caretOffset > 0 ? _startComposition.CreatePointer(_caretOffset, LogicalDirection.Forward) : _endComposition;
}
else
{
caretNavigator = _editor.Selection.End.CreatePointer();
}
ITextPointer startPosition = startNavigator.CreatePointer(LogicalDirection.Forward);
ITextPointer endPosition = endNavigator.CreatePointer(LogicalDirection.Backward);
ITextPointer caretPosition = caretNavigator.CreatePointer(LogicalDirection.Forward);
// We need to update the layout before getting rect. It could be dirty.
if (!startPosition.ValidateLayout() ||
!endPosition.ValidateLayout() ||
!caretPosition.ValidateLayout())
{
return;
}
view = TextEditor.GetTextView(RenderScope);
rectStart = view.GetRectangleFromTextPosition(startPosition);
rectEnd = view.GetRectangleFromTextPosition(endPosition);
rectCaret = view.GetRectangleFromTextPosition(caretPosition);
// Take the "extended" union of the first and last char's bounding box.
milPointTopLeft = new Point(Math.Min(rectStart.Left, rectEnd.Left), Math.Min(rectStart.Top, rectEnd.Top));
milPointBottomRight = new Point(Math.Max(rectStart.Left, rectEnd.Left), Math.Max(rectStart.Bottom, rectEnd.Bottom));
milPointCaret = new Point(rectCaret.Left, rectCaret.Bottom);
// Transform to root visual coordinates.
transform = RenderScope.TransformToAncestor(compositionTarget.RootVisual);
transform.TryTransform(milPointTopLeft, out milPointTopLeft);
transform.TryTransform(milPointBottomRight, out milPointBottomRight);
transform.TryTransform(milPointCaret, out milPointCaret);
// Transform to device units.
milPointTopLeft = compositionTarget.TransformToDevice.Transform(milPointTopLeft);
milPointBottomRight = compositionTarget.TransformToDevice.Transform(milPointBottomRight);
milPointCaret = compositionTarget.TransformToDevice.Transform(milPointCaret);
// Build CANDIDATEFORM. CANDIDATEFORM is window coodidate.
candform.dwIndex = 0;
candform.dwStyle = NativeMethods.CFS_EXCLUDE;
candform.rcArea.left = ConvertToInt32(milPointTopLeft.X);
candform.rcArea.right = ConvertToInt32(milPointBottomRight.X);
candform.rcArea.top = ConvertToInt32(milPointTopLeft.Y);
candform.rcArea.bottom = ConvertToInt32(milPointBottomRight.Y);
candform.ptCurrentPos = new NativeMethods.POINT(ConvertToInt32(milPointCaret.X), ConvertToInt32(milPointCaret.Y));
}
// Call IMM32 to set new candidate position to hIMC.
// ImmSetCandidateWindow fails when
// - candform.dwIndex is invalid (over 4).
// - himc belongs to other threads.
// - fail to lock IMC.
// Those cases are ignorable for us.
// In addition, it does not set win32 last error and we have no clue to handle error.
#pragma warning suppress 6031
UnsafeNativeMethods.ImmSetCandidateWindow(new HandleRef(this, himc), ref candform);
UnsafeNativeMethods.ImmReleaseContext(new HandleRef(this, hwnd), new HandleRef(this, himc));
}
// We want to pass this message to DefWindowProc.
// We don't update "handled".
}
}
/// <summary>
/// WndProc
/// </summary>
/// <param name="m"></param>
protected override void WndProc(ref Message m)
{
// LogWriter logWriter = new LogWriter(@"C:\log\MyTextbox.txt");
// logWriter.Write(m.ToString());
IntPtr hIMC;
switch (m.Msg)
{
case NativeMethods.WM_CHAR:
hIMC = NativeMethods.ImmGetContext(this.Handle);
if (NativeMethods.ImmGetOpenStatus(hIMC) == 0)
{
char chr = Convert.ToChar(m.WParam.ToInt32() & 0xff);
Insert(chr.ToString());
// caret.SetPos(caret.GetPos().X + , caret.GetPos().Y);
}
NativeMethods.ImmReleaseContext(this.Handle, hIMC);
Invalidate();
break;
case NativeMethods.WM_IME_STARTCOMPOSITION:
hIMC = NativeMethods.ImmGetContext(this.Handle);
// ImmSetCompositionWindowとImmSetCandidateWindowがしっかり機能しているのかがイマイチ分からない。
// 変換ウィンドウの位置を設定
NativeMethods.COMPOSITIONFORM cf = new NativeMethods.COMPOSITIONFORM();
cf.dwStyle = NativeMethods.CFS_POINT;
cf.ptCurrentPos = new Point(100, 0);
cf.rcArea = new Rectangle();
NativeMethods.ImmSetCompositionWindow(hIMC, ref cf);
// 候補文字ウィンドウの位置調整を行う
NativeMethods.CANDIDATEFORM lpCandidate = new NativeMethods.CANDIDATEFORM();
lpCandidate.dwIndex = 0;
lpCandidate.dwStyle = NativeMethods.CFS_CANDIDATEPOS;
lpCandidate.ptCurrentPos = new Point(10, 50);
NativeMethods.ImmSetCandidateWindow(hIMC, ref lpCandidate);
NativeMethods.ImmReleaseContext(this.Handle, hIMC);
break;
case NativeMethods.WM_IME_COMPOSITION:
this.ImeComposition(m);
break;
case NativeMethods.WM_IME_ENDCOMPOSITION:
break;
case NativeMethods.WM_IME_NOTIFY:
switch (m.WParam.ToInt32())
{
case NativeMethods.IMN_OPENCANDIDATE:
// 候補文字ウィンドウが表示された
this.SetCandidateWindowPos(m.HWnd);
break;
case NativeMethods.IMN_CLOSECANDIDATE:
case NativeMethods.IMN_CHANGECANDIDATE:
case NativeMethods.IMN_SETOPENSTATUS:
// 何もしない。
break;
}
break;
}
base.WndProc(ref m);
}
