private static void GetCompositionUnderlines(IntPtr hIMC, int targetStart, int targetEnd, List <CompositionUnderline> underlines)
{
var clauseSize = ImeNative.ImmGetCompositionString(hIMC, ImeNative.GCS_COMPCLAUSE, null, 0);
if (clauseSize <= 0)
{
return;
}
int clauseLength = (int)clauseSize / sizeof(Int32);
// buffer contains 32 bytes (4 bytes) array
var clauseData = new byte[(int)clauseSize];
ImeNative.ImmGetCompositionString(hIMC, ImeNative.GCS_COMPCLAUSE, clauseData, clauseSize);
var clauseLength_1 = clauseLength - 1;
for (int i = 0; i < clauseLength_1; i++)
{
int from = BitConverter.ToInt32(clauseData, i * sizeof(Int32));
int to = BitConverter.ToInt32(clauseData, (i + 1) * sizeof(Int32));
var range = new Range(from, to);
bool thick = (range.From >= targetStart && range.To <= targetEnd);
underlines.Add(new CompositionUnderline(range, ColorUNDERLINE, ColorBKCOLOR, thick));
}
}
private static bool GetString(IntPtr hIMC, uint lParam, uint type, out string text)
{
text = string.Empty;
if (!IsParam(lParam, type))
{
return(false);
}
var strLen = ImeNative.ImmGetCompositionString(hIMC, type, null, 0);
if (strLen <= 0)
{
return(false);
}
// buffer contains char (2 bytes)
byte[] buffer = new byte[strLen];
ImeNative.ImmGetCompositionString(hIMC, type, buffer, strLen);
text = Encoding.Unicode.GetString(buffer);
return(true);
}
private static void GetCompositionSelectionRange(IntPtr hIMC, ref int targetStart, ref int targetEnd)
{
var attributeSize = ImeNative.ImmGetCompositionString(hIMC, ImeNative.GCS_COMPATTR, null, 0);
if (attributeSize <= 0)
{
return;
}
int start = 0;
int end = 0;
// Buffer contains 8bit array
var attributeData = new byte[attributeSize];
ImeNative.ImmGetCompositionString(hIMC, ImeNative.GCS_COMPATTR, attributeData, attributeSize);
for (start = 0; start < attributeSize; ++start)
{
if (IsSelectionAttribute(attributeData[start]))
{
break;
}
}
for (end = start; end < attributeSize; ++end)
{
if (!IsSelectionAttribute(attributeData[end]))
{
break;
}
}
targetStart = start;
targetEnd = end;
}
private static void GetCompositionInfo(IntPtr hwnd, uint lParam, string text, List <CompositionUnderline> underlines, ref int compositionStart)
{
var hIMC = ImeNative.ImmGetContext(hwnd);
underlines.Clear();
int targetStart = text.Length;
int targetEnd = text.Length;
if (IsParam(lParam, ImeNative.GCS_COMPATTR))
{
GetCompositionSelectionRange(hIMC, ref targetStart, ref targetEnd);
}
// Retrieve the selection range information. If CS_NOMOVECARET is specified
// it means the cursor should not be moved and we therefore place the caret at
// the beginning of the composition string. Otherwise we should honour the
// GCS_CURSORPOS value if it's available.
if (!IsParam(lParam, ImeNative.CS_NOMOVECARET) && IsParam(lParam, ImeNative.GCS_CURSORPOS))
{
// IMM32 does not support non-zero-width selection in a composition. So
// always use the caret position as selection range.
int cursor = (int)ImeNative.ImmGetCompositionString(hIMC, ImeNative.GCS_CURSORPOS, null, 0);
compositionStart = cursor;
}
else
{
compositionStart = 0;
}
if (IsParam(lParam, ImeNative.GCS_COMPCLAUSE))
{
GetCompositionUnderlines(hIMC, targetStart, targetEnd, underlines);
}
if (underlines.Count == 0)
{
var range = new Range();
bool thick = false;
if (targetStart > 0)
{
range = new Range(0, targetStart);
}
if (targetEnd > targetStart)
{
range = new Range(targetStart, targetEnd);
thick = true;
}
if (targetEnd < text.Length)
{
range = new Range(targetEnd, text.Length);
}
underlines.Add(new CompositionUnderline(range, ColorUNDERLINE, ColorBKCOLOR, thick));
}
ImeNative.ImmReleaseContext(hwnd, hIMC);
}