/****************************************************************************

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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the QtGui module of the Qt Toolkit.

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

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** $QT_END_LICENSE$

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****************************************************************************/

#include "qerrormessage.h"

#ifndef QT_NO_ERRORMESSAGE

#include "qapplication.h"

#include "qcheckbox.h"

#include "qlabel.h"

#include "qlayout.h"

#include "qmessagebox.h"

#include "qpushbutton.h"

#include "qstringlist.h"

#include "qtextedit.h"

#include "qdialog_p.h"

#include "qpixmap.h"

#include "qmetaobject.h"

#include "qthread.h"

#include "qqueue.h"

#include "qset.h"

#include <stdio.h>

#include <stdlib.h>

#ifdef Q_WS_WINCE

extern bool qt_wince_is_mobile();    //defined in qguifunctions_wince.cpp

extern bool qt_wince_is_high_dpi();  //defined in qguifunctions_wince.cpp

#include "qguifunctions_wince.h"

#endif

#if defined(QT_SOFTKEYS_ENABLED)

#include <qaction.h>

#ifdef Q_WS_S60

#include "private/qt_s60_p.h"

#endif

#endif

QT_BEGIN_NAMESPACE

class QErrorMessagePrivate : public QDialogPrivate

{

    Q_DECLARE_PUBLIC(QErrorMessage)

public:

    QPushButton * ok;

    QCheckBox * again;

    QTextEdit * errors;

    QLabel * icon;

#ifdef QT_SOFTKEYS_ENABLED

    QAction *okAction;

#endif

    QQueue<QPair<QString, QString> > pending;

    QSet<QString> doNotShow;

    QSet<QString> doNotShowType;

    QString currentMessage;

    QString currentType;

    bool nextPending();

    void retranslateStrings();

};

class QErrorMessageTextView : public QTextEdit

{

public:

    QErrorMessageTextView(QWidget *parent)

        : QTextEdit(parent) { setReadOnly(true); }

    virtual QSize minimumSizeHint() const;

    virtual QSize sizeHint() const;

};

QSize QErrorMessageTextView::minimumSizeHint() const

{

#ifdef Q_WS_WINCE

    if (qt_wince_is_mobile())

         if (qt_wince_is_high_dpi())

            return QSize(200, 200);

         else

             return QSize(100, 100);

    else

      return QSize(70, 70);

#else

    return QSize(50, 50);

#endif

}

QSize QErrorMessageTextView::sizeHint() const

{

#ifdef Q_WS_WINCE

    if (qt_wince_is_mobile())

         if (qt_wince_is_high_dpi())

            return QSize(400, 200);

         else

             return QSize(320, 120);

    else

      return QSize(300, 100);

#else

#ifdef Q_WS_S60

    const int smallerDimension = qMin(S60->screenHeightInPixels, S60->screenWidthInPixels);

    // In S60 layout data, error messages seem to be one third of the screen height (in portrait) minus two.

    return QSize(smallerDimension, smallerDimension/3-2);

#else

    return QSize(250, 75);

#endif //Q_WS_S60

#endif //Q_WS_WINCE

}

/*!

    \class QErrorMessage

    \brief The QErrorMessage class provides an error message display dialog.

    \ingroup standard-dialog

    An error message widget consists of a text label and a checkbox. The

    checkbox lets the user control whether the same error message will be

    displayed again in the future, typically displaying the text,

    "Show this message again" translated into the appropriate local

    language.

    For production applications, the class can be used to display messages which

    the user only needs to see once. To use QErrorMessage like this, you create

    the dialog in the usual way, and show it by calling the showMessage() slot or

    connecting signals to it.

    The static qtHandler() function installs a message handler

    using qInstallMsgHandler() and creates a QErrorMessage that displays

    qDebug(), qWarning() and qFatal() messages. This is most useful in

    environments where no console is available to display warnings and

    error messages.

    In both cases QErrorMessage will queue pending messages and display

    them in order, with each new message being shown as soon as the user

    has accepted the previous message. Once the user has specified that a

    message is not to be shown again it is automatically skipped, and the

    dialog will show the next appropriate message in the queue.

    The \l{dialogs/standarddialogs}{Standard Dialogs} example shows

    how to use QErrorMessage as well as other built-in Qt dialogs.

    \img qerrormessage.png

    \sa QMessageBox, QStatusBar::showMessage(), {Standard Dialogs Example}

*/

static QErrorMessage * qtMessageHandler = 0;

static void deleteStaticcQErrorMessage() // post-routine

{

    if (qtMessageHandler) {

        delete qtMessageHandler;

        qtMessageHandler = 0;

    }

}

static bool metFatal = false;

static void jump(QtMsgType t, const char * m)

{

    if (!qtMessageHandler)

        return;

    QString rich;

    switch (t) {

    case QtDebugMsg:

    default:

        rich = QErrorMessage::tr("Debug Message:");

        break;

    case QtWarningMsg:

        rich = QErrorMessage::tr("Warning:");

        break;

    case QtFatalMsg:

        rich = QErrorMessage::tr("Fatal Error:");

    }

    rich = QString::fromLatin1("<p><b>%1</b></p>").arg(rich);

    rich += Qt::convertFromPlainText(QLatin1String(m), Qt::WhiteSpaceNormal);

    // ### work around text engine quirk

    if (rich.endsWith(QLatin1String("</p>")))

        rich.chop(4);

    if (!metFatal) {

        if (QThread::currentThread() == qApp->thread()) {

            qtMessageHandler->showMessage(rich);

        } else {

            QMetaObject::invokeMethod(qtMessageHandler,

                                      "showMessage",

                                      Qt::QueuedConnection,

                                      Q_ARG(QString, rich));

        }

        metFatal = (t == QtFatalMsg);

    }

}

/*!

    Constructs and installs an error handler window with the given \a

    parent.

*/

QErrorMessage::QErrorMessage(QWidget * parent)

    : QDialog(*new QErrorMessagePrivate, parent)

{

    Q_D(QErrorMessage);

    QGridLayout * grid = new QGridLayout(this);

    d->icon = new QLabel(this);

#ifndef QT_NO_MESSAGEBOX

    d->icon->setPixmap(QMessageBox::standardIcon(QMessageBox::Information));

    d->icon->setAlignment(Qt::AlignHCenter | Qt::AlignTop);

#endif

    grid->addWidget(d->icon, 0, 0, Qt::AlignTop);

    d->errors = new QErrorMessageTextView(this);

    grid->addWidget(d->errors, 0, 1);

    d->again = new QCheckBox(this);

    d->again->setChecked(true);

    grid->addWidget(d->again, 1, 1, Qt::AlignTop);

    d->ok = new QPushButton(this);

#ifdef QT_SOFTKEYS_ENABLED

    d->okAction = new QAction(d->ok);

    d->okAction->setSoftKeyRole(QAction::PositiveSoftKey);

    connect(d->okAction, SIGNAL(triggered()), this, SLOT(accept()));

    addAction(d->okAction);

#endif

#if defined(Q_WS_WINCE) || defined(Q_WS_S60)

    d->ok->setFixedSize(0,0);

#endif

    connect(d->ok, SIGNAL(clicked()), this, SLOT(accept()));

    d->ok->setFocus();

    grid->addWidget(d->ok, 2, 0, 1, 2, Qt::AlignCenter);

    grid->setColumnStretch(1, 42);

    grid->setRowStretch(0, 42);

    d->retranslateStrings();

}

/*!

    Destroys the error message dialog.

*/

QErrorMessage::~QErrorMessage()

{

    if (this == qtMessageHandler) {

        qtMessageHandler = 0;

        QtMsgHandler tmp = qInstallMsgHandler(0);

        // in case someone else has later stuck in another...

        if (tmp != jump)

            qInstallMsgHandler(tmp);

    }

}

/*! \reimp */

void QErrorMessage::done(int a)

{

    Q_D(QErrorMessage);

    if (!d->again->isChecked() && !d->currentMessage.isEmpty() && d->currentType.isEmpty()) {

        d->doNotShow.insert(d->currentMessage);

    }

    if (!d->again->isChecked() && !d->currentType.isEmpty()) {

        d->doNotShowType.insert(d->currentType);

    }

    d->currentMessage.clear();

    d->currentType.clear();

    if (!d->nextPending()) {

        QDialog::done(a);

        if (this == qtMessageHandler && metFatal)

            exit(1);

    }

}

/*!

    Returns a pointer to a QErrorMessage object that outputs the

    default Qt messages. This function creates such an object, if there

    isn't one already.

*/

QErrorMessage * QErrorMessage::qtHandler()

{

    if (!qtMessageHandler) {

        qtMessageHandler = new QErrorMessage(0);

        qAddPostRoutine(deleteStaticcQErrorMessage); // clean up

        qtMessageHandler->setWindowTitle(QApplication::applicationName());

        qInstallMsgHandler(jump);

    }

    return qtMessageHandler;

}

/*! \internal */

bool QErrorMessagePrivate::nextPending()

{

    while (!pending.isEmpty()) {

        QPair<QString,QString> pendingMessage = pending.dequeue();

        QString message = pendingMessage.first;

        QString type = pendingMessage.second;

        if (!message.isEmpty() && ((type.isEmpty() && !doNotShow.contains(message)) || (!type.isEmpty() && !doNotShowType.contains(type)))) {

#ifndef QT_NO_TEXTHTMLPARSER

            errors->setHtml(message);

#else

            errors->setPlainText(message);

#endif

            currentMessage = message;

            currentType = type;

            return true;

        }

    }

    return false;

}

/*!

    Shows the given message, \a message, and returns immediately. If the user

    has requested for the message not to be shown again, this function does

    nothing.

    Normally, the message is displayed immediately. However, if there are

    pending messages, it will be queued to be displayed later.

*/

void QErrorMessage::showMessage(const QString &message)

{

    Q_D(QErrorMessage);

    if (d->doNotShow.contains(message))

        return;

    d->pending.enqueue(qMakePair(message,QString()));

    if (!isVisible() && d->nextPending())

        show();

}

/*!

    \since 4.5

    \overload

    Shows the given message, \a message, and returns immediately. If the user

    has requested for messages of type, \a type, not to be shown again, this

    function does nothing.

    Normally, the message is displayed immediately. However, if there are

    pending messages, it will be queued to be displayed later.

    \sa showMessage()

*/

void QErrorMessage::showMessage(const QString &message, const QString &type)

{

    Q_D(QErrorMessage);

    if (d->doNotShow.contains(message) && d->doNotShowType.contains(type))

        return;

     d->pending.push_back(qMakePair(message,type));

    if (!isVisible() && d->nextPending())

        show();

}

/*!

    \reimp

*/

void QErrorMessage::changeEvent(QEvent *e)

{

    Q_D(QErrorMessage);

    if (e->type() == QEvent::LanguageChange) {

        d->retranslateStrings();

    }

    QDialog::changeEvent(e);

}

void QErrorMessagePrivate::retranslateStrings()

{

    again->setText(QErrorMessage::tr("&Show this message again"));

    ok->setText(QErrorMessage::tr("&OK"));

#ifdef QT_SOFTKEYS_ENABLED

    okAction->setText(ok->text());

#endif

}

/*!

    \fn void QErrorMessage::message(const QString & message)

    Use showMessage(\a message) instead.

*/

QT_END_NAMESPACE

#endif // QT_NO_ERRORMESSAGE