/*
 * Caret functions
 *
 * Copyright 1993 David Metcalfe
 * Copyright 1996 Frans van Dorsselaer
 */

#include "windows.h"
#include "selectors.h"
#include "alias.h"
#include "relay32.h"
#include "stddebug.h"
/* #define DEBUG_CARET */
#include "debug.h"


typedef struct
{
    HWND          hwnd;
    short         hidden;
    BOOL          on;
    short         x;
    short         y;
    short         width;
    short         height;
    HBRUSH        hBrush;
    WORD          timeout;
    WORD          timerid;
} CARET;

typedef enum
{
    CARET_OFF = 0,
    CARET_ON,
    CARET_TOGGLE,
} DISPLAY_CARET;

static CARET Caret = { 0, };


/*****************************************************************
 *              CARET_GetHwnd
 */
HWND CARET_GetHwnd()
{
    return Caret.hwnd;
}

/*****************************************************************
 *               CARET_DisplayCaret
 */
void CARET_DisplayCaret(DISPLAY_CARET status)
{
    HDC hdc;
    HBRUSH hPrevBrush;

    if (Caret.on && (status == CARET_ON)) return;
    if (!Caret.on && (status == CARET_OFF)) return;

    /* So now it's always a toggle */

    Caret.on = !Caret.on;
    if (!(hdc = GetDCEx( Caret.hwnd, 0, DCX_USESTYLE | DCX_CACHE ))) return;
    hPrevBrush = SelectObject( hdc, Caret.hBrush );
    PatBlt( hdc, Caret.x, Caret.y, Caret.width, Caret.height, PATINVERT );
    SelectObject( hdc, hPrevBrush );
    ReleaseDC( Caret.hwnd, hdc );
}

  
/*****************************************************************
 *               CARET_Callback
 */
WORD CARET_Callback(HWND hwnd, WORD msg, WORD timerid, LONG ctime)
{
    dprintf_caret(stddeb,"CARET_Callback: hwnd=%04x, timerid=%d, caret=%d\n",
                  hwnd, timerid, Caret.on);
	
    CARET_DisplayCaret(CARET_TOGGLE);
    return 0;
}


/*****************************************************************
 *               CARET_SetTimer
 */
void CARET_SetTimer(void)
{
    if (Caret.timerid) KillSystemTimer((HWND)0, Caret.timerid);
    Caret.timerid = SetSystemTimer((HWND)0, 0, Caret.timeout,
			(FARPROC)GetWndProcEntry16("CARET_Callback"));
}


/*****************************************************************
 *               CARET_ResetTimer
 */
void CARET_ResetTimer(void)
{
    if (Caret.timerid) 
    {
	KillSystemTimer((HWND)0, Caret.timerid);
	Caret.timerid = SetSystemTimer((HWND)0, 0, Caret.timeout,
			(FARPROC)GetWndProcEntry16("CARET_Callback"));
    }
}


/*****************************************************************
 *               CARET_KillTimer
 */
void CARET_KillTimer(void)
{
    if (Caret.timerid) 
    {
	KillSystemTimer((HWND)0, Caret.timerid);
	Caret.timerid = 0;
    }
}


/*****************************************************************
 *               CARET_Initialize
 */
static void CARET_Initialize()
{
    DWORD WineProc,Win16Proc,Win32Proc;
    static int initialized=0;

    if(!initialized)
    {
	WineProc = (DWORD)CARET_Callback;
	Win16Proc = (DWORD)GetWndProcEntry16("CARET_Callback");
	Win32Proc = (DWORD)RELAY32_GetEntryPoint(
				RELAY32_GetBuiltinDLL("WINPROCS32"),
				"CARET_Callback", 0);
	ALIAS_RegisterAlias(WineProc, Win16Proc, Win32Proc);
	initialized=1;
    }
}


/*****************************************************************
 *               CreateCaret          (USER.163)
 */
BOOL CreateCaret(HWND hwnd, HBITMAP bitmap, INT width, INT height)
{
    dprintf_caret(stddeb,"CreateCaret: hwnd=%04x\n", hwnd);

    if (!hwnd) return FALSE;

    /* if cursor already exists, destroy it */
    if (Caret.hwnd) DestroyCaret();

    if (bitmap && (bitmap != 1))
    {
        BITMAP bmp;
        if (!GetObject( bitmap, sizeof(bmp), (LPSTR)&bmp )) return FALSE;
        Caret.width = bmp.bmWidth;
        Caret.height = bmp.bmHeight;
        /* FIXME: we should make a copy of the bitmap instead of a brush */
        Caret.hBrush = CreatePatternBrush( bitmap );
    }
    else
    {
        Caret.width = width ? width : GetSystemMetrics(SM_CXBORDER);
        Caret.height = height ? height : GetSystemMetrics(SM_CYBORDER);
        Caret.hBrush = CreateSolidBrush( bitmap ? GetSysColor(COLOR_GRAYTEXT) :
                                         GetSysColor(COLOR_WINDOW) );
    }

    Caret.hwnd = hwnd;
    Caret.hidden = 1;
    Caret.on = FALSE;
    Caret.x = 0;
    Caret.y = 0;

    Caret.timeout = GetProfileInt( "windows", "CursorBlinkRate", 750 );

    CARET_Initialize();

    return TRUE;
}
   

/*****************************************************************
 *               DestroyCaret         (USER.164)
 */

BOOL DestroyCaret()
{
    if (!Caret.hwnd) return FALSE;

    dprintf_caret(stddeb,"DestroyCaret: hwnd=%04x, timerid=%d\n",
		Caret.hwnd, Caret.timerid);

    DeleteObject( Caret.hBrush );
    CARET_KillTimer();
    CARET_DisplayCaret(CARET_OFF);

    Caret.hwnd = 0;
    return TRUE;
}


/*****************************************************************
 *               SetCaretPos          (USER.165)
 */

void SetCaretPos(short x, short y)
{
    if (!Caret.hwnd) return;
    if ((x == Caret.x) && (y == Caret.y)) return;

    dprintf_caret(stddeb,"SetCaretPos: x=%d, y=%d\n", x, y);

    CARET_KillTimer();
    CARET_DisplayCaret(CARET_OFF);
    Caret.x = x;
    Caret.y = y;
    if (!Caret.hidden)
    {
	CARET_DisplayCaret(CARET_ON);
	CARET_SetTimer();
    }
}

/*****************************************************************
 *               HideCaret            (USER.166)
 */

void HideCaret(HWND hwnd)
{
    if (!Caret.hwnd) return;
    if (hwnd && (Caret.hwnd != hwnd)) return;

    dprintf_caret(stddeb,"HideCaret: hwnd=%04x, hidden=%d\n",
                  hwnd, Caret.hidden);

    CARET_KillTimer();
    CARET_DisplayCaret(CARET_OFF);
    Caret.hidden++;
}


/*****************************************************************
 *               ShowCaret            (USER.167)
 */

void ShowCaret(HWND hwnd)
{
    if (!Caret.hwnd) return;
    if (hwnd && (Caret.hwnd != hwnd)) return;

    dprintf_caret(stddeb,"ShowCaret: hwnd=%04x, hidden=%d\n",
		hwnd, Caret.hidden);

    if (Caret.hidden)
    {
	Caret.hidden--;
	if (!Caret.hidden)
	{
	    CARET_DisplayCaret(CARET_ON);
	    CARET_SetTimer();
	}
    }
}


/*****************************************************************
 *               SetCaretBlinkTime    (USER.168)
 */

void SetCaretBlinkTime(WORD msecs)
{
    if (!Caret.hwnd) return;

    dprintf_caret(stddeb,"SetCaretBlinkTime: hwnd=%04x, msecs=%d\n",
		Caret.hwnd, msecs);

    Caret.timeout = msecs;
    CARET_ResetTimer();
}


/*****************************************************************
 *               GetCaretBlinkTime    (USER.169)
 */

WORD GetCaretBlinkTime()
{
    if (!Caret.hwnd) return 0;

    dprintf_caret(stddeb,"GetCaretBlinkTime: hwnd=%04x, msecs=%d\n",
		Caret.hwnd, Caret.timeout);

    return Caret.timeout;
}


/*****************************************************************
 *               GetCaretPos          (USER.183)
 */

void GetCaretPos(LPPOINT pt)
{
    if (!Caret.hwnd || !pt) return;

    dprintf_caret(stddeb,"GetCaretPos: hwnd=%04x, pt=%p, x=%d, y=%d\n",
                  Caret.hwnd, pt, Caret.x, Caret.y);

    pt->x = Caret.x;
    pt->y = Caret.y;
}