Piper's Pit BBS/FTP: ibm 0040 - 0049/ibm0040-0049/ibm0040.tar/ibm0040/ZINC_6.ZIP/DOSSRC.ZIP/CURSOR.CPP

C/C++ Source or Header | 1991-06-01 | 4.6 KB | 193 lines

//    Program name..    Zinc Interface Library
//    Filename......    CURSOR.CPP
//    Version.......    1.0
//
//    COPYRIGHT (C) 1990.  All Rights Reserved.
//    Zinc Software Incorporated.  Pleasant Grove, Utah  USA

#include "ui_evt.hpp"

static void VideoInt(void)
{
    asm        push    bp                // Save BP
    asm        int        10H                // because INT 10H may clobber it
    asm        pop        bp                // due to bug in older BIOS versions
}

// ----- Constructor & Destructor -------------------------------------------

UI_CURSOR::UI_CURSOR(USHORT initialState) :
    UI_DEVICE(E_CURSOR, initialState)
{
    /* Initialize the cursor device */
    lastTime = *((USHORT far *)0x46CL);
    cursorMask = DC_INSERT;
    blink = (initialState == D_OFF) ? FALSE : TRUE;
    line = column = 0;
    installed = TRUE;
}

// ----- Member functions ---------------------------------------------------

void UI_CURSOR::Display(USHORT displayCursorMask, USHORT displayState)
{
    if (!display)
        return;
    else if (display->isText)
    {
        _CX = (displayState == D_OFF || displayState == D_HIDE) ?
            display->offCursorValue : display->onCursorValue;
        if (displayState != D_OFF && displayCursorMask == DC_INSERT)
            _CH = 0;
        _AH = 1;
        VideoInt();
    }
    else if (displayState != D_OFF && displayState != D_HIDE)
    {
        UI_REGION region;
        region.left = column;
        region.top = (displayCursorMask == DC_INSERT) ? line : line + 7;
        region.right = column + 7;
        region.bottom = (displayCursorMask == DC_INSERT) ? line + 6 : line + 8;
        display->Rectangle(ID_SCREEN, region, _xorPalette, 1, TRUE, TRUE);
    }
}

int UI_CURSOR::Event(const UI_EVENT &event)
{
    if (state == DC_INVALID)
        return (state);

    /* Switch on the rawCode */
    USHORT ccode = event.rawCode;
    USHORT t_cursorMask = cursorMask;
    USHORT t_state = state;
    switch (ccode)
    {
    case D_HIDE:
    case D_SHOW:
        if (state == D_OFF)
            return (state);
        UI_REGION region;
        if (display->isText)
        {
            region.left = region.right = column;
            region.top = region.bottom = line;
        }
        else
        {
            region.left = column;
            region.top = (cursorMask == DC_INSERT) ? line : line + 7;
            region.right = column + 7;
            region.bottom = (cursorMask == DC_INSERT) ? line + 6 : line + 8;
        }
         if (Max(event.region.left, region.left) > Min(event.region.right, region.right) ||
            Max(event.region.top, region.top) > Min(event.region.bottom, region.bottom))
            return(0);
        state = (ccode == D_HIDE) ? D_HIDE : D_ON;
        blink = (ccode == D_HIDE) ? FALSE : TRUE;
        break;

    case DC_BLINK:
        state = (state == D_ON) ? D_OFF : D_ON;
        break;

    case DC_INSERT:
    case DC_OVERTYPE:
    case DC_INSERT_OFF:
    case DC_OVERTYPE_OFF:
    case D_OFF:
    case D_ON:
        if (ccode == DC_INSERT_OFF || ccode == DC_INSERT)
            cursorMask = DC_INSERT;
        else if (ccode == DC_OVERTYPE_OFF || ccode == DC_OVERTYPE)
            cursorMask = DC_OVERTYPE;
        if ( ccode == D_OFF ||
            (!display->isText && (ccode == DC_INSERT_OFF || ccode == DC_OVERTYPE_OFF) ) )
            state = D_OFF;
        else
            state = D_ON;
        blink = (ccode == D_OFF) ? FALSE : TRUE;
        lastTime = *((USHORT far *)0x46CL);        // Reset blink count
        break;

    case D_INITIALIZE:
        t_state = (display->isText) ? D_ON : D_OFF;
        if (display->isText)        // Change the cursor position.
        {
            _BH = 0;
            _DH = line;
            _DL = column;
            _AH = 2;
            VideoInt();
        }
        break;

    case D_POSITION:
        if (event.position.line == line && event.position.column == column)
            return (state);
        if (!display->isText && state != D_OFF)
        {
            Display(cursorMask, state);
            t_state = D_OFF;
        }
        line = event.position.line;
        column = event.position.column;
        if (display->isText)
        {
            _BH = 0;
            _DH = line;
            _DL = column;
            _AH = 2;
            VideoInt();
        }
        break;

    default:
        return (state);
    }

    /* Change the cursor state */
    if (t_cursorMask != cursorMask || t_state != state)
    {
        USHORT t2_state = state;
        state = DC_INVALID;
        UI_REGION region;
        if (display->isText)
        {
            region.left = region.right = column;
            region.top = region.bottom = line;
        }
        else
        {
            region.left = column - 1;
            region.top = line;
            region.right = column + 7;
            region.bottom = line + 7;
        }
        eventManager->DevicesHide(region);
        if (!display->isText)
            Display(t_cursorMask, t_state);
        Display(cursorMask, t2_state);
        eventManager->DevicesShow(region);
        state = t2_state;
    }

    /* Return the device state */
    return (state);
}

void UI_CURSOR::Poll(void)
{
    /* Check the state and time of the cursor */
    USHORT currentTime = *((USHORT far *)0x46CL);
    if (!display->isText && blink && currentTime - lastTime > 6)
    {
        UI_EVENT t_event;
        t_event.rawCode = DC_BLINK;
        Event(t_event);
        lastTime = currentTime;
    }
}