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

C/C++ Source or Header | 1991-06-01 | 4.6 KB | 192 lines

//    Zinc Interface Library - EVENT.CPP
//    COPYRIGHT (C) 1990, 1991.  All Rights Reserved.
//    Zinc Software Incorporated.  Pleasant Grove, Utah  USA

#include "ui_evt.hpp"
#include <dos.h>

UI_EVENT_MANAGER::UI_EVENT_MANAGER(int _noOfElements, UI_DISPLAY *_display) :
    UI_LIST(UI_DEVICE::CompareFunction), queueBlock(_noOfElements),
    display(_display), level(1)
{
    _display->eventManager = this;
}

void UI_EVENT_MANAGER::Add(UI_DEVICE *device)
{
    // Add the device to the object list.
    UI_LIST::Add(device);

    device->display = display;
    device->eventManager = this;
    UI_EVENT event;
    event.type = device->type;
    event.rawCode = D_INITIALIZE;
    device->Event(event);
}

void UI_EVENT_MANAGER::DevicesHide(const UI_REGION ®ion)
{
    // Hide devices when at the highest level.
    if (level-- <= 0)
        return;

    disable();
    UI_EVENT event;
    event.type = E_DEVICE;
    event.rawCode = D_HIDE;
    event.region = region;
    for (UI_DEVICE *device = First(); device; device = device->Next())
         device->Event(event);
}

void UI_EVENT_MANAGER::DevicesShow(const UI_REGION ®ion)
{
    // Show devices only when at the highest level.
    if (level > -1)
    {
        UI_EVENT event;
        event.type = E_DEVICE;
        event.rawCode = D_SHOW;
        event.region = region;
        for (UI_DEVICE *device = Last(); device; device = device->Previous())
             device->Event(event);
        enable();
    }
    level++;
}

void UI_EVENT_MANAGER::DevicePosition(int deviceType, int column, int line)
{
    UI_EVENT event;
    event.type = deviceType;
    event.rawCode = D_POSITION;
    event.position.column = column;
    event.position.line = line;
    UI_EVENT_MANAGER::Event(event);
}

int UI_EVENT_MANAGER::DeviceState(int deviceType, USHORT deviceState)
{
    UI_EVENT event;
    event.type = deviceType;
    event.rawCode = deviceState;
    return (UI_EVENT_MANAGER::Event(event));
}

int UI_EVENT_MANAGER::Event(const UI_EVENT &event)
{
    // Process the event.
    int ccode = event.type;
    int status = D_OFF;
    if (ccode == S_RESET_DISPLAY && !event.data)
    {
        UI_EVENT tEvent;
        tEvent.type = E_DEVICE;
        tEvent.rawCode = D_RESTORE;
        for (UI_DEVICE *device = First(); device; device = device->Next())
             status = device->Event(tEvent);
    }
    else if (ccode == S_RESET_DISPLAY)
    {
        display = (UI_DISPLAY *)event.data;
        display->eventManager = this;
        UI_DEVICE *tDevice = First();
        first = current = last = NULL;
        while (tDevice)
        {
            UI_DEVICE *device = tDevice;
            tDevice = device->Next();
            UI_EVENT_MANAGER::Add(device);
        }
    }
    else
    {
        for (UI_DEVICE *device = First(); device; device = device->Next())
            if (ccode == E_DEVICE || ccode == device->type)
                 status = device->Event(event);
    }
    return (status);
}

int UI_EVENT_MANAGER::Get(UI_EVENT &event, USHORT flags)
{
    UI_DEVICE *device;
    UI_QUEUE_ELEMENT *element;
    int error = -1;

    // Stay in loop while no event conditions are met.
    do
    {
        // Call all the polled devices.
        if (!FlagSet(flags, Q_NO_POLL))
            for (device = First(); device; device = device->Next())
                 device->Poll();

        // Get the event.
        disable();
        element = (FlagSet(flags, Q_END)) ?
            queueBlock.Last() : queueBlock.First();
        if (element)
        {
            event = element->event;
            if (!FlagSet(flags, Q_NO_DESTROY))
                queueBlock.Subtract((UI_ELEMENT *)element);
            error = 0;
        }
        else if (FlagSet(flags, Q_NO_BLOCK))
        {
            enable();
            return (-2);
        }
        enable();

    } while (error);

    // Return the error status.
    return (error);
}

void UI_EVENT_MANAGER::Put(const UI_EVENT &event, USHORT flags)
{
    // Place the event back in the event queue.
    disable();
    UI_QUEUE_ELEMENT *element = (FlagSet(flags, Q_END)) ?
        (UI_QUEUE_ELEMENT *)queueBlock.Add(0) :
        (UI_QUEUE_ELEMENT *)queueBlock.Add(queueBlock.First());
    if (element)
        element->event = event;
    enable();
}

void UI_EVENT_MANAGER::Subtract(UI_DEVICE *device)
{
    UI_EVENT event;
    event.type = device->type;
    event.rawCode = D_RESTORE;
    device->Event(event);
    UI_LIST::Subtract(device);
}

int UI_DEVICE::CompareFunction(void *device1, void *device2)
{
    return (((UI_DEVICE *)device1)->type - ((UI_DEVICE *)device2)->type);
}

UI_QUEUE_BLOCK::UI_QUEUE_BLOCK(int a_noOfElements) :
    UI_LIST_BLOCK(a_noOfElements, 0)
{
    // Initialize the queue block.
    UI_QUEUE_ELEMENT *queueBlock = new UI_QUEUE_ELEMENT[a_noOfElements];
    elementArray = queueBlock;
    for (int i = 0; i < a_noOfElements; i++)
        freeList.Add(0, &queueBlock[i]);
}

UI_QUEUE_BLOCK::~UI_QUEUE_BLOCK()
{
    // Free the queue block.
    UI_QUEUE_ELEMENT *queueBlock = (UI_QUEUE_ELEMENT *)elementArray;
    delete [noOfElements]queueBlock;
}