Developer CD Series 1995…tember: Reference Library/Dev.CD Sep 95 RL/Dev.CD Sep 95 RL.toast/mac/Technical Documentation/develop/develop Issue 23 code/ProjectDrag 1.1b4/Sources/ProjectDrag Sources/TasksAndErrors.c

C/C++ Source or Header | 1995-07-11 | 4.5 KB | 194 lines | [TEXT/MPS ]

/* TasksAndErrors.h: Task and error notification routines for ProjectDrag
 *
 * A set of applets for drag and drop source control by Tim Maroney.
 * See develop, issue 23 for details.
 *
 * Built on DropShell by Leonard Rosenthol, Stephan Somogyi, and Marshall Clow,
 * and using the MoreFiles utilities by Jim Luther.
 *
 * This software is free, but don't modify and redistribute it without
 * changing the status window to indicate your name and your changes!
 */

#include <Dialogs.h>
#include <Errors.h>
#include <LowMem.h>
#include <ToolUtils.h>

#include "TasksAndErrors.h"
#include "DSGlobals.h"
#include "PDUtilities.h"


#define    kResTextAlertID    207

#define kStatusWindow 210
#define kStatusInfo 1
#define kStatusText 3


typedef struct TaskStackEntry
{
    struct TaskStackEntry *fNext;
    Str255 fMessage;
} TaskStackEntry;


static DialogPtr pStatusWindow;
static OSErr pTaskError;
static Str255 pTaskErrorString;
static Boolean pHaveErrorNumber = false;
static Boolean pHaveErrorString = false;
static TaskStackEntry *pTaskStack = NULL;


static void ResTextErrorAlert(short strListID, short strIndex, OSErr callerErr,
                               StringPtr param1, StringPtr param2,
                               StringPtr param3, StringPtr param4);


static void InstallStatusWindow(void)
{
    if (pStatusWindow == NULL)
    {
        short type;
        Handle h;
        Rect r;
        Str255 s;

        pStatusWindow = GetNewDialog(kStatusWindow, NULL, (WindowPtr)-1);
        GetDItem(pStatusWindow, kStatusInfo, &type, &h, &r);
        ReplaceInIndString(s, kProjectDragStrings, kTimsByline, LMGetCurApName(),
                            NULL, NULL, NULL);
        SetIText(h, s);
        ShowWindow(pStatusWindow);
        DrawDialog(pStatusWindow);
    }
}


void SetStatusMessage(StringPtr message)
{
    short type;
    Handle h;
    Rect r;
    Str255 s;
    unsigned char nullString[1];

    if (pStatusWindow == NULL)
        InstallStatusWindow();

    GetDItem(pStatusWindow, kStatusText, &type, &h, &r);
    GetIText(h, s);
    if (message == NULL)
    {
        nullString[0] = 0;
        message = nullString;
    }
    if (!EqualString(message, s, true, true))
        SetIText(h, message);
}


void TaskStart(short strListID, short strIndex, StringPtr param1, StringPtr param2,
                StringPtr param3, StringPtr param4)
{
    Str255 message;
    TaskStackEntry *theEntry;

    ReplaceInIndString(message, strListID, strIndex, param1, param2, param3, param4);
    SetStatusMessage(message);

    /* push the task string onto the task stack */
    theEntry = (TaskStackEntry*)NewPtr(sizeof(TaskStackEntry));
    /* XXX uh-oh if there's no memory */
    BlockMoveData(message, theEntry->fMessage, message[0] + 1);
    theEntry->fNext = pTaskStack;
    pTaskStack = theEntry;
}


void TaskDone(void)
{
    /* pop the task from the task stack */
    TaskStackEntry *theEntry = pTaskStack;
    pTaskStack = pTaskStack->fNext;
    DisposePtr((Ptr)theEntry);

    if (pTaskStack != NULL)
    {
        SetStatusMessage(pTaskStack->fMessage);
    }
    else if (!gDone)
    {
        /* put nothing in the status window */
        SetStatusMessage(NULL);
    }
}


void PopAllTasks(void)
{
    /* if there was an error, show the alert */
    if (pHaveErrorNumber)
    {
        if (pTaskError != userCanceledErr)
            ResTextErrorAlert(kProjectDragStrings, kAnErrorOccured, pTaskError,
                              pTaskStack->fMessage, NULL, NULL, NULL);
    }
    else if (pHaveErrorString)
    {
        ResTextErrorAlert(kProjectDragStrings, kAnErrorOccured, pTaskError,
                            pTaskStack->fMessage, pTaskErrorString, NULL, NULL);
    }
    pHaveErrorNumber = pHaveErrorString = false;

    /* delete the task stack */
    while (pTaskStack)
    {
        TaskStackEntry *theEntry = pTaskStack;
        pTaskStack = pTaskStack->fNext;
        DisposePtr((Ptr)theEntry);
    }

    /* put nothing in the status window */
    SetStatusMessage(NULL);
}


OSErr RaiseErrorNumber(OSErr err)
{
    /* mark the error for PopAllTasks to show */
    pHaveErrorNumber = true;
    pTaskError = err;
    return err;
}


void RaiseErrorString(short strListID, short strIndex,
                       StringPtr param1, StringPtr param2,
                       StringPtr param3, StringPtr param4)
{
    /* mark the error for PopAllTasks to show */
    pHaveErrorString = true;
    ReplaceInIndString(pTaskErrorString, strListID, strIndex,
                       param1, param2, param3, param4);
}


void ResTextErrorAlert(short strListID, short strIndex, OSErr callerErr,
                       StringPtr param1, StringPtr param2,
                       StringPtr param3, StringPtr param4)
{
    Str255 message;
    Str255 errorString;

    if (callerErr != noErr)
        NumToString (callerErr, errorString);
    else
        errorString[0] = 0;
    ReplaceInIndString(message, strListID, strIndex, param1, param2, param3, param4);
    ParamText(message, errorString, NULL, NULL);
    (void) Alert ( kResTextAlertID, NULL );
}