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/* vi:set ts=8 sts=4 sw=4:
*
* VIM - Vi IMproved by Bram Moolenaar
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
*/

/*
* DESCRIPTION:
* This module produces Global IME for Vim, on Windows with Internet
* Explorer 5.01 or higher. You need three files "dimm.idl", "dimm.h", and
* "dimm_i.c" when compile this module at your self. "dimm.h", and
* "dimm_i.c" are generated from "dimm.idl" by using MIDL.EXE as like
* "if_ole.h". You can get "dimm.idl" in MSDN web site. I got it below
* URL.
*
* WHAT IS THE GLOBAL IME?:
* Global IME makes capability input Chinese, Japanese, and Korean text into
* Vim buffer on any language version of Windows 98, Windows 95, and Windows
* NT 4.0. See below URL for detail of Global IME. You can also find
* various language version of Global IME at same place.
*
* RUNTIME REQUIREMENTS:
* - Internet Explorer 5.01 or higher.
* - Global IME (with language pack?).
* - Of course Vim for Windows.
*
* URLS:
* - Where you can probably get "dimm.idl".
* http://msdn.microsoft.com/downloads/samples/internet/libraries/ie5_lib/sample.asp
* - Global IME detailed information.
* http://www.microsoft.com/windows/ie/features/ime.asp
*/

#ifdef GLOBAL_IME

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <objbase.h>
extern "C" {
#include "vim.h"
}
#include "dimm.h"
#include "glbl_ime.h"

static IActiveIMMApp *pIApp = NULL;
static IActiveIMMMessagePumpOwner *pIMsg = NULL;
static HWND s_hWnd = NULL;
static BOOL s_bStatus = FALSE; /* for evacuate */

/*
* Initialize Global IME.
* "atom" must be return value of RegisterClass(Ex).
*/
    void
global_ime_init(ATOM atom, HWND hWnd)
{
    IUnknown *pI;
    HRESULT hr;

    if (pIApp != NULL || pIMsg != NULL)
return;
    OleInitialize(NULL);

    /*
* Get interface IUnknown
*/
    hr = CoCreateInstance(CLSID_CActiveIMM, NULL, CLSCTX_SERVER,
IID_IUnknown, (void**)&pI);
    if (FAILED(hr) || !pI)
return;

    /*
* Get interface IActiveIMMApp
*/
    hr = pI->QueryInterface(IID_IActiveIMMApp, (void**)&pIApp);
    if (FAILED(hr))
pIApp = NULL;

    /*
* Get interface IActiveIMMMessagePumpOwner
*/
    hr = pI->QueryInterface(IID_IActiveIMMMessagePumpOwner, (void**)&pIMsg);
    if (FAILED(hr))
pIMsg = NULL;

    if (pIApp != NULL)
    {
pIApp->Activate(TRUE);
pIApp->FilterClientWindows(&atom, 1);
    }
    if (pIMsg != NULL)
pIMsg->Start();

    pI->Release();
    s_hWnd = hWnd;
}

/*
* Reset and clear Global IME.
*/
    void
global_ime_end()
{
    if (pIApp != NULL)
    {
IActiveIMMApp *p = pIApp;

pIApp = NULL;
p->FilterClientWindows(NULL, 0);
p->Deactivate();
p->Release();
    }
    if (pIMsg != NULL)
    {
IActiveIMMMessagePumpOwner *p = pIMsg;

pIMsg = NULL;
p->End();
p->Release();
    }
    OleUninitialize();
}

/*
* Replacement for DefWindowProc().
*/
    LRESULT WINAPI
global_ime_DefWindowProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
    LRESULT lResult;

    if (pIApp == NULL || pIApp->OnDefWindowProc(hWnd, Msg,
wParam, lParam, &lResult) != S_OK)
    {
#if defined(WIN3264) && defined(FEAT_MBYTE)
if (wide_WindowProc)
lResult = DefWindowProcW(hWnd, Msg, wParam, lParam);
else
#endif
lResult = DefWindowProc(hWnd, Msg, wParam, lParam);
    }
    return lResult;
}

/*
* Replace with TranslateMessage()
*/
    BOOL WINAPI
global_ime_TranslateMessage(CONST MSG *lpMsg)
{
    if (pIMsg == NULL || pIMsg->OnTranslateMessage(lpMsg) == S_FALSE)
return TranslateMessage(lpMsg);
    return TRUE;
}

/*
* Set position of IME compotision window.
*
* You have to call this before starting composition. If once composition
* started, this can take no effect until that composition have finished. So
* you should handle WM_IME_STARTCOMPOSITION and call this function.
*/
    void WINAPI
global_ime_set_position(POINT *pPoint)
{
    HIMC hImc = NULL;

    if (pIApp == NULL || pPoint == NULL)
return;

    if (SUCCEEDED(pIApp->GetContext(s_hWnd, &hImc)))
    {
COMPOSITIONFORM CompForm;

CompForm.dwStyle = CFS_POINT;
CompForm.ptCurrentPos = *pPoint;
pIApp->SetCompositionWindow(hImc, &CompForm);
pIApp->ReleaseContext(s_hWnd, hImc);
    }
}

/*
* Set font to Global IME
*/
/* GIME_TEST */
    void WINAPI
global_ime_set_font(LOGFONT *pFont)
{
    HIMC hImc = NULL;

    if (pIApp == NULL || pFont == NULL)
return;

    if (SUCCEEDED(pIApp->GetContext(s_hWnd, &hImc)))
    {
pIApp->SetCompositionFontA(hImc, pFont);
pIApp->ReleaseContext(s_hWnd, hImc);
    }
}

#if 0
/*
* for IME control. Save current status of IME, and set force new-status to
* English (turn off).
*/
    void WINAPI
global_ime_status_evacuate()
{
    HIMC hImc;

    if (pIApp != NULL && SUCCEEDED(pIApp->GetContext(s_hWnd, &hImc)))
    {
s_bStatus = (pIApp->GetOpenStatus(hImc) == 0) ? TRUE : FALSE;
pIApp->SetOpenStatus(hImc, FALSE);
pIApp->ReleaseContext(s_hWnd, hImc);
    }
}

/*
* for IME control. Change IME status to last saved one.
*/
    void WINAPI
global_ime_status_restore()
{
    HIMC hImc;

    if (pIApp != NULL && SUCCEEDED(pIApp->GetContext(s_hWnd, &hImc)))
    {
pIApp->SetOpenStatus(hImc, s_bStatus);
pIApp->ReleaseContext(s_hWnd, hImc);
    }
}
#endif

    void WINAPI
global_ime_set_status(int status)
{
    HIMC hImc;

    if (pIApp != NULL && SUCCEEDED(pIApp->GetContext(s_hWnd, &hImc)))
    {
pIApp->SetOpenStatus(hImc, status ? TRUE : FALSE);
pIApp->ReleaseContext(s_hWnd, hImc);
    }
}

    int WINAPI
global_ime_get_status()
{
    int status = 0;
    HIMC hImc;

    if (pIApp != NULL && SUCCEEDED(pIApp->GetContext(s_hWnd, &hImc)))
    {
status = pIApp->GetOpenStatus(hImc) ? 1 : 0;
pIApp->ReleaseContext(s_hWnd, hImc);
    }
    return status;
}

#endif /* GLOBAL_IME */
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