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/*

 * Copyright (c) 2000 Greg Haerr <greg@censoft.com>

 *

 * Caret control for Microwindows win32 api.

 *

 * TODO: add SetSysTimer for blinking

 */

#include <stdio.h>

#include <stdlib.h>

#include <sys/time.h>

#ifndef __ECOS

#include <malloc.h>

#endif

#include "windows.h"

#include "device.h"

#define DEF_BLINK_TIME          500     /* default blink time in ms*/

typedef struct {

        HWND    hwnd;           /* != NULL if caret is created*/

        int     x;

        int     y;

        int     nWidth;

        int     nHeight;

        BOOL    fShown;         /* caret is currently visible*/

        int     nShowCount;     /* <= 0 for hidden caret*/

        UINT    nBlinkTime;

} CARETINFO;

/* local data*/

static CARETINFO sysCaret;      /* the system caret*/

/* local procs*/

static void MwShowCaret(void);

static void MwHideCaret(void);

static void MwUpdateCaret(void);

BOOL WINAPI

CreateCaret(HWND hwnd, HBITMAP hBitmap, int nWidth, int nHeight)

{

        DestroyCaret();                 /* destroy old caret if any*/

        if (nWidth <= 0)

                nWidth = 1;

        if (nHeight <= 0)

                nHeight = 1;

        sysCaret.hwnd = hwnd;

        sysCaret.x = 0;

        sysCaret.y = 0;

        sysCaret.nWidth = nWidth;

        sysCaret.nHeight = nHeight;

        sysCaret.fShown = FALSE;

        sysCaret.nShowCount = 0;

        sysCaret.nBlinkTime = DEF_BLINK_TIME;

        return TRUE;

}

BOOL WINAPI

DestroyCaret(VOID)

{

        if (sysCaret.fShown)

                MwHideCaret();

        sysCaret.hwnd = NULL;

        sysCaret.fShown = FALSE;

        return TRUE;

}

BOOL WINAPI

HideCaret(HWND hwnd)

{

        if (hwnd == NULL)

                hwnd = sysCaret.hwnd;

        if (hwnd == NULL || hwnd != sysCaret.hwnd)

                return FALSE;

        /* hide caret if this call made it invisible*/

        if (--sysCaret.nShowCount == 0) {

                MwHideCaret();

                return TRUE;

        }

        return FALSE;

}

BOOL WINAPI

ShowCaret(HWND hwnd)

{

        if (hwnd == NULL)

                hwnd = sysCaret.hwnd;

        if (hwnd == NULL || hwnd != sysCaret.hwnd || sysCaret.nShowCount < 0)

                return FALSE;

        if (++sysCaret.nShowCount > 1)

                return TRUE;

        /* show caret, this call made it visible*/

        MwShowCaret();

        return TRUE;

}

BOOL WINAPI

SetCaretPos(int nX, int nY)

{

        if (sysCaret.fShown && (sysCaret.x != nX || sysCaret.y != nY)) {

                MwUpdateCaret();        /* toggle off*/

                sysCaret.x = nX;

                sysCaret.y = nY;

                MwUpdateCaret();        /* toggle on in new location*/

                return TRUE;

        }

        sysCaret.x = nX;

        sysCaret.y = nY;

        return TRUE;

}

BOOL WINAPI

GetCaretPos(LPPOINT lpPoint)

{

        lpPoint->x = sysCaret.x;

        lpPoint->y = sysCaret.y;

        return TRUE;

}

UINT WINAPI

GetCaretBlinkTime(VOID)

{

        return sysCaret.nBlinkTime;

}

BOOL WINAPI

SetCaretBlinkTime(UINT uMSeconds)

{

        sysCaret.nBlinkTime = uMSeconds;

        /* SetSysTimer */

        return TRUE;

}

static void

MwShowCaret(void)

{

        if (sysCaret.fShown)

                return;

        MwUpdateCaret();

        sysCaret.fShown = TRUE;

}

static void

MwHideCaret(void)

{

        if (!sysCaret.fShown)

                return;

        MwUpdateCaret();

        sysCaret.fShown = FALSE;

}

/* Draw the caret using XOR.  Same routine is used to show and hide caret.*/

static void

MwUpdateCaret(void)

{

        int     oldmode;

        HDC     hdc;

        HPEN    hpen;

        HBRUSH  hbr;

        oldmode = GdSetMode(MWMODE_XOR);

        hdc = GetDC(sysCaret.hwnd);

        hpen = SelectObject(hdc, GetStockObject(WHITE_PEN));

        /* it seems there's some problems with Rectangle with nWidth == 1*/

        if (sysCaret.nWidth == 1) {

                MoveToEx(hdc, sysCaret.x, sysCaret.y, NULL);

                LineTo(hdc, sysCaret.x, sysCaret.y+sysCaret.nHeight);

        } else {

                hbr = SelectObject(hdc, GetStockObject(WHITE_BRUSH));

                Rectangle(hdc, sysCaret.x, sysCaret.y,

                        sysCaret.x+sysCaret.nWidth,

                        sysCaret.y+sysCaret.nHeight);

                SelectObject(hdc, hbr);

        }

        SelectObject(hdc, hpen);

        ReleaseDC(sysCaret.hwnd, hdc);

        GdSetMode(oldmode);

}