compui.c

This folder includes IME sample source code for Simplified Chinese IMEs

/*++

Copyright (c) 1990-1999 Microsoft Corporation, All Rights Reserved

Module Name:

    compui.c

++*/


#include <windows.h>
#include <imm.h>
#include "imedefs.h"
#include <regstr.h>

/**********************************************************************/
/* GetCompWnd                                                         */
/* Return Value :                                                     */
/*      window handle of composition                                  */
/**********************************************************************/
HWND PASCAL GetCompWnd(
    HWND hUIWnd)                // UI window
{
    HGLOBAL  hUIPrivate;
    LPUIPRIV lpUIPrivate;
    HWND     hCompWnd;

    hUIPrivate = (HGLOBAL)GetWindowLongPtr(hUIWnd, IMMGWLP_PRIVATE);
    if (!hUIPrivate) {          // can not darw candidate window
        return (HWND)NULL;
    }

    lpUIPrivate = (LPUIPRIV)GlobalLock(hUIPrivate);
    if (!lpUIPrivate) {         // can not draw candidate window
        return (HWND)NULL;
    }

    hCompWnd = lpUIPrivate->hCompWnd;

    GlobalUnlock(hUIPrivate);
    return (hCompWnd);
}

/**********************************************************************/
/* FitInLazyOperation()                                               */
/* Return Value :                                                     */
/*      TRUE or FALSE                                                 */
/**********************************************************************/
BOOL PASCAL FitInLazyOperation( // fit in lazy operation or not
    LPPOINT lpptOrg,
    LPPOINT lpptNearCaret,      // the suggested near caret position
    LPRECT  lprcInputRect,
    UINT    uEsc)
{
    POINT ptDelta, ptTol;
    RECT  rcUIRect, rcInterRect;

    ptDelta.x = lpptOrg->x - lpptNearCaret->x;

    ptDelta.x = (ptDelta.x >= 0) ? ptDelta.x : -ptDelta.x;

    ptTol.x = sImeG.iParaTol * ncUIEsc[uEsc].iParaFacX +
        sImeG.iPerpTol * ncUIEsc[uEsc].iPerpFacX;

    ptTol.x = (ptTol.x >= 0) ? ptTol.x : -ptTol.x;

    if (ptDelta.x > ptTol.x) {
        return (FALSE);
    }

    ptDelta.y = lpptOrg->y - lpptNearCaret->y;

    ptDelta.y = (ptDelta.y >= 0) ? ptDelta.y : -ptDelta.y;

    ptTol.y = sImeG.iParaTol * ncUIEsc[uEsc].iParaFacY +
        sImeG.iPerpTol * ncUIEsc[uEsc].iPerpFacY;

    ptTol.y = (ptTol.y >= 0) ? ptTol.y : -ptTol.y;

    if (ptDelta.y > ptTol.y) {
        return (FALSE);
    }

    // build up the UI rectangle (composition window)
    rcUIRect.left = lpptOrg->x;
    rcUIRect.top = lpptOrg->y;
    rcUIRect.right = rcUIRect.left + lpImeL->xCompWi;
    rcUIRect.bottom = rcUIRect.top + lpImeL->yCompHi;

    if (IntersectRect(&rcInterRect, &rcUIRect, lprcInputRect)) {
        return (FALSE);
    }

    return (TRUE);
}

/**********************************************************************/
/* GetNearCaretPosition()                                             */
/**********************************************************************/
void PASCAL GetNearCaretPosition(   // decide a near caret position according
                                    // to the caret position
    LPPOINT lpptFont,
    UINT    uEsc,
    UINT    uRot,
    LPPOINT lpptCaret,
    LPPOINT lpptNearCaret,
    BOOL    fFlags)
{
    LONG lFontSize;
    LONG xWidthUI, yHeightUI, xBorder, yBorder;
    RECT rcWorkArea;

    if ((uEsc + uRot) & 0x0001) {
        lFontSize = lpptFont->x;
    } else {
        lFontSize = lpptFont->y;
    }

    xWidthUI  = lpImeL->xCompWi;
    yHeightUI = lpImeL->yCompHi;
    xBorder   = lpImeL->cxCompBorder;
    yBorder   = lpImeL->cyCompBorder;

    if (fFlags & NEAR_CARET_FIRST_TIME) {
        lpptNearCaret->x = lpptCaret->x +
            lFontSize * ncUIEsc[uEsc].iLogFontFacX +
            sImeG.iPara * ncUIEsc[uEsc].iParaFacX +
            sImeG.iPerp * ncUIEsc[uEsc].iPerpFacX;

        if (ptInputEsc[uEsc].x >= 0) {
            lpptNearCaret->x += xBorder * 2;
        } else {
            lpptNearCaret->x -= xWidthUI - xBorder * 2;
        }

        lpptNearCaret->y = lpptCaret->y +
            lFontSize * ncUIEsc[uEsc].iLogFontFacY +
            sImeG.iPara * ncUIEsc[uEsc].iParaFacY +
            sImeG.iPerp * ncUIEsc[uEsc].iPerpFacY;

        if (ptInputEsc[uEsc].y >= 0) {
            lpptNearCaret->y += yBorder * 2;
        } else {
            lpptNearCaret->y -= yHeightUI - yBorder * 2;
        }
    } else {
        lpptNearCaret->x = lpptCaret->x +
            lFontSize * ncAltUIEsc[uEsc].iLogFontFacX +
            sImeG.iPara * ncAltUIEsc[uEsc].iParaFacX +
            sImeG.iPerp * ncAltUIEsc[uEsc].iPerpFacX;

        if (ptAltInputEsc[uEsc].x >= 0) {
            lpptNearCaret->x += xBorder * 2;
        } else {
            lpptNearCaret->x -= xWidthUI - xBorder * 2;
        }

        lpptNearCaret->y = lpptCaret->y +
            lFontSize * ncAltUIEsc[uEsc].iLogFontFacY +
            sImeG.iPara * ncAltUIEsc[uEsc].iParaFacY +
            sImeG.iPerp * ncAltUIEsc[uEsc].iPerpFacY;

        if (ptAltInputEsc[uEsc].y >= 0) {
            lpptNearCaret->y += yBorder * 2;
        } else {
            lpptNearCaret->y -= yHeightUI - yBorder * 2;
        }
    }

#ifdef MUL_MONITOR 
    rcWorkArea = ImeMonitorWorkAreaFromPoint(*lpptCaret);
#else
    rcWorkArea = sImeG.rcWorkArea; 
#endif

    if (lpptNearCaret->x < rcWorkArea.left) {
        lpptNearCaret->x = rcWorkArea.left;
    } else if (lpptNearCaret->x + xWidthUI > rcWorkArea.right) {
        lpptNearCaret->x = rcWorkArea.right - xWidthUI;
    } 

    if (lpptNearCaret->y < rcWorkArea.top) {
        lpptNearCaret->y = rcWorkArea.top;
    } else if (lpptNearCaret->y + yHeightUI > rcWorkArea.bottom) {
        lpptNearCaret->y = rcWorkArea.bottom - yHeightUI;
    } 

    return;
}

/**********************************************************************/
/* AdjustCompPosition()                                               */
/* Return Value :                                                     */
/*      the position of composition window is changed or not          */
/**********************************************************************/
BOOL PASCAL AdjustCompPosition(         // IME adjust position according to
                                        // composition form
    LPINPUTCONTEXT lpIMC,
    LPPOINT        lpptOrg,             // original composition window
                                        // and final position
    LPPOINT        lpptNew)             // new expect position
{
    POINT ptNearCaret, ptOldNearCaret;
    UINT  uEsc, uRot;
    RECT  rcUIRect, rcInputRect, rcInterRect;
    POINT ptFont;

    // we need to adjust according to font attribute
    if (lpIMC->lfFont.A.lfWidth > 0) {
        ptFont.x = lpIMC->lfFont.A.lfWidth * 2;
    } else if (lpIMC->lfFont.A.lfWidth < 0) {
        ptFont.x = -lpIMC->lfFont.A.lfWidth * 2;
    } else if (lpIMC->lfFont.A.lfHeight > 0) {
        ptFont.x = lpIMC->lfFont.A.lfHeight;
    } else if (lpIMC->lfFont.A.lfHeight < 0) {
        ptFont.x = -lpIMC->lfFont.A.lfHeight;
    } else {
        ptFont.x = lpImeL->yCompHi;
    }

    if (lpIMC->lfFont.A.lfHeight > 0) {
        ptFont.y = lpIMC->lfFont.A.lfHeight;
    } else if (lpIMC->lfFont.A.lfHeight < 0) {
        ptFont.y = -lpIMC->lfFont.A.lfHeight;
    } else {
        ptFont.y = ptFont.x;
    }

    // if the input char is too big, we don't need to consider so much
    if (ptFont.x > lpImeL->yCompHi * 8) {
        ptFont.x = lpImeL->yCompHi * 8;
    }
    if (ptFont.y > lpImeL->yCompHi * 8) {
        ptFont.y = lpImeL->yCompHi * 8;
    }

    if (ptFont.x < sImeG.xChiCharWi) {
        ptFont.x = sImeG.xChiCharWi;
    }

    if (ptFont.y < sImeG.yChiCharHi) {
        ptFont.y = sImeG.yChiCharHi;
    }

    // -450 to 450 index 0
    // 450 to 1350 index 1
    // 1350 to 2250 index 2
    // 2250 to 3150 index 3
    uEsc = (UINT)((lpIMC->lfFont.A.lfEscapement + 450) / 900 % 4);
    uRot = (UINT)((lpIMC->lfFont.A.lfOrientation + 450) / 900 % 4);

    // decide the input rectangle
    rcInputRect.left = lpptNew->x;
    rcInputRect.top = lpptNew->y;

    // build up an input rectangle from escapemment
    rcInputRect.right = rcInputRect.left + ptFont.x * ptInputEsc[uEsc].x;
    rcInputRect.bottom = rcInputRect.top + ptFont.y * ptInputEsc[uEsc].y;

    // be a normal rectangle, not a negative rectangle
    if (rcInputRect.left > rcInputRect.right) {
        LONG tmp;

        tmp = rcInputRect.left;
        rcInputRect.left = rcInputRect.right;
        rcInputRect.right = tmp;
    }

    if (rcInputRect.top > rcInputRect.bottom) {
        LONG tmp;

        tmp = rcInputRect.top;
        rcInputRect.top = rcInputRect.bottom;
        rcInputRect.bottom = tmp;
    }

    GetNearCaretPosition(
        &ptFont, uEsc, uRot, lpptNew, &ptNearCaret, NEAR_CARET_FIRST_TIME);

    // 1st, use the adjust point
    // build up the new suggest UI rectangle (composition window)
    rcUIRect.left = ptNearCaret.x;
    rcUIRect.top = ptNearCaret.y;
    rcUIRect.right = rcUIRect.left + lpImeL->xCompWi;
    rcUIRect.bottom = rcUIRect.top + lpImeL->yCompHi;

    ptOldNearCaret = ptNearCaret;

    // OK, no intersect between the near caret position and input char
    if (IntersectRect(&rcInterRect, &rcUIRect, &rcInputRect)) {
    } else if (FitInLazyOperation(
        lpptOrg, &ptNearCaret, &rcInputRect, uEsc)) {
        // happy ending!!!, don't change position
        return (FALSE);
    } else {
        *lpptOrg = ptNearCaret;

        // happy ending!!
        return (TRUE);
    }

    // unhappy case
    GetNearCaretPosition(
            &ptFont, uEsc, uRot, lpptNew, &ptNearCaret, 0);

    // build up the new suggest UI rectangle (composition window)
    rcUIRect.left = ptNearCaret.x;
    rcUIRect.top = ptNearCaret.y;
    rcUIRect.right = rcUIRect.left + lpImeL->xCompWi;
    rcUIRect.bottom = rcUIRect.top + lpImeL->yCompHi;

    // OK, no intersect between the adjust position and input char
    if (IntersectRect(&rcInterRect, &rcUIRect, &rcInputRect)) {
    } else if (FitInLazyOperation(
        lpptOrg, &ptNearCaret, &rcInputRect, uEsc)) {
        return (FALSE);
    } else {
        *lpptOrg = ptNearCaret;

        return (TRUE);
    }

    *lpptOrg = ptOldNearCaret;

    return (TRUE);
}

/**********************************************************************/
/* SetCompPosition()                                                  */
/**********************************************************************/
void PASCAL SetCompPosition(    // set the composition window position
    HWND           hCompWnd,
    HIMC           hIMC,
    LPINPUTCONTEXT lpIMC)
{
    POINT ptWnd;
    POINT ptSTWPos;
    HWND  hCandWnd;
    BOOL  fChange = FALSE;
    RECT  rcWorkArea;


#ifdef MUL_MONITOR 
    rcWorkArea = ImeMonitorWorkAreaFromWindow(lpIMC->hWnd);
#else
    rcWorkArea = sImeG.rcWorkArea;
#endif

    // the client coordinate position (0, 0) of composition window
    ptWnd.x = 0;
    ptWnd.y = 0;
    // convert to screen coordinates