public static bool GetResult(IntPtr hwnd, uint lParam, out string text)
{
var hIMC = ImeNative.ImmGetContext(hwnd);
var ret = GetString(hIMC, lParam, ImeNative.GCS_RESULTSTR, out text);
ImeNative.ImmReleaseContext(hwnd, hIMC);
return(ret);
}
public static bool GetComposition(IntPtr hwnd, uint lParam, List <CompositionUnderline> underlines, ref int compositionStart, out string text)
{
var hIMC = ImeNative.ImmGetContext(hwnd);
bool ret = GetString(hIMC, lParam, ImeNative.GCS_COMPSTR, out text);
if (ret)
{
GetCompositionInfo(hwnd, lParam, text, underlines, ref compositionStart);
}
ImeNative.ImmReleaseContext(hwnd, hIMC);
return(ret);
}
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);
}
private static void GetCompositionInfo(IntPtr hwnd, uint lParam, string text, List <CompositionUnderline> underlines, ref int compositionStart)
{
var hIMC = ImeNative.ImmGetContext(hwnd);
underlines.Clear();
byte[] attributes = null;
int targetStart = text.Length;
int targetEnd = text.Length;
if (IsParam(lParam, ImeNative.GCS_COMPATTR))
{
attributes = 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 (attributes != null &&
// character before
((compositionStart > 0 && (compositionStart - 1) < attributes.Length && attributes[compositionStart - 1] == ImeNative.ATTR_INPUT)
||
// character after
(compositionStart >= 0 && compositionStart < attributes.Length && attributes[compositionStart] == ImeNative.ATTR_INPUT)))
{
// as MS does with their ime implementation we should only use the GCS_CURSORPOS if the character
// before or after is new input.
// https://referencesource.microsoft.com/#PresentationFramework/src/Framework/System/windows/Documents/ImmComposition.cs,1079
}
else
{
compositionStart = text.Length;
}
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);
}
