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#include "qprogressdialog.h"

#ifndef QT_NO_PROGRESSDIALOG

#include "qshortcut.h"

#include "qpainter.h"

#include "qdrawutil.h"

#include "qdatetime.h"

#include "qlabel.h"

#include "qprogressbar.h"

#include "qapplication.h"

#include "qstyle.h"

#include "qpushbutton.h"

#include "qcursor.h"

#include "qtimer.h"

#include <private/qdialog_p.h>

#include <limits.h>

#if defined(QT_SOFTKEYS_ENABLED)

#include <qaction.h>

#endif

#ifdef Q_WS_S60

#include <QtGui/qdesktopwidget.h>

#endif

QT_BEGIN_NAMESPACE

// If the operation is expected to take this long (as predicted by

// progress time), show the progress dialog.

static const int defaultShowTime = 4000;

// Wait at least this long before attempting to make a prediction.

static const int minWaitTime = 50;

class QProgressDialogPrivate : public QDialogPrivate

{

    Q_DECLARE_PUBLIC(QProgressDialog)

public:

    QProgressDialogPrivate() : label(0), cancel(0), bar(0),

        shown_once(false),

        cancellation_flag(false),

        showTime(defaultShowTime),

#ifndef QT_NO_SHORTCUT

        escapeShortcut(0),

#endif

#ifdef QT_SOFTKEYS_ENABLED

        cancelAction(0),

#endif

        useDefaultCancelText(false)

    {

    }

    void init(const QString &labelText, const QString &cancelText, int min, int max);

    void layout();

    void retranslateStrings();

    void _q_disconnectOnClose();

    QLabel *label;

    QPushButton *cancel;

    QProgressBar *bar;

    QTimer *forceTimer;

    bool shown_once;

    bool cancellation_flag;

    QTime starttime;

#ifndef QT_NO_CURSOR

    QCursor parentCursor;

#endif

    int showTime;

    bool autoClose;

    bool autoReset;

    bool forceHide;

#ifndef QT_NO_SHORTCUT

    QShortcut *escapeShortcut;

#endif

#ifdef QT_SOFTKEYS_ENABLED

    QAction *cancelAction;

#endif

    bool useDefaultCancelText;

    QPointer<QObject> receiverToDisconnectOnClose;

    QByteArray memberToDisconnectOnClose;

};

void QProgressDialogPrivate::init(const QString &labelText, const QString &cancelText,

                                  int min, int max)

{

    Q_Q(QProgressDialog);

    label = new QLabel(labelText, q);

    int align = q->style()->styleHint(QStyle::SH_ProgressDialog_TextLabelAlignment, 0, q);

    label->setAlignment(Qt::Alignment(align));

    bar = new QProgressBar(q);

    bar->setRange(min, max);

    autoClose = true;

    autoReset = true;

    forceHide = false;

    QObject::connect(q, SIGNAL(canceled()), q, SLOT(cancel()));

    forceTimer = new QTimer(q);

    QObject::connect(forceTimer, SIGNAL(timeout()), q, SLOT(forceShow()));

    if (useDefaultCancelText) {

        retranslateStrings();

    } else {

        q->setCancelButtonText(cancelText);

    }

}

void QProgressDialogPrivate::layout()

{

    Q_Q(QProgressDialog);

    int sp = q->style()->pixelMetric(QStyle::PM_DefaultLayoutSpacing);

    int mtb = q->style()->pixelMetric(QStyle::PM_DefaultTopLevelMargin);

    int mlr = qMin(q->width() / 10, mtb);

    const bool centered =

        bool(q->style()->styleHint(QStyle::SH_ProgressDialog_CenterCancelButton, 0, q));

    QSize cs = cancel ? cancel->sizeHint() : QSize(0,0);

    QSize bh = bar->sizeHint();

    int cspc;

    int lh = 0;

    // Find spacing and sizes that fit.  It is important that a progress

    // dialog can be made very small if the user demands it so.

    for (int attempt=5; attempt--;) {

        cspc = cancel ? cs.height() + sp : 0;

        lh = qMax(0, q->height() - mtb - bh.height() - sp - cspc);

        if (lh < q->height()/4) {

            // Getting cramped

            sp /= 2;

            mtb /= 2;

            if (cancel) {

                cs.setHeight(qMax(4,cs.height()-sp-2));

            }

            bh.setHeight(qMax(4,bh.height()-sp-1));

        } else {

            break;

        }

    }

    if (cancel) {

        cancel->setGeometry(

            centered ? q->width()/2 - cs.width()/2 : q->width() - mlr - cs.width(),

            q->height() - mtb - cs.height(),

            cs.width(), cs.height());

    }

    if (label)

        label->setGeometry(mlr, 0, q->width()-mlr*2, lh);

    bar->setGeometry(mlr, lh+sp, q->width()-mlr*2, bh.height());

}

void QProgressDialogPrivate::retranslateStrings()

{

    Q_Q(QProgressDialog);

    if (useDefaultCancelText)

        q->setCancelButtonText(QProgressDialog::tr("Cancel"));

}

void QProgressDialogPrivate::_q_disconnectOnClose()

{

    Q_Q(QProgressDialog);

    if (receiverToDisconnectOnClose) {

        QObject::disconnect(q, SIGNAL(canceled()), receiverToDisconnectOnClose,

                            memberToDisconnectOnClose);

        receiverToDisconnectOnClose = 0;

    }

    memberToDisconnectOnClose.clear();

}

/*!

  \class QProgressDialog

  \brief The QProgressDialog class provides feedback on the progress of a slow operation.

  \ingroup standard-dialogs

  A progress dialog is used to give the user an indication of how long

  an operation is going to take, and to demonstrate that the

  application has not frozen. It can also give the user an opportunity

  to abort the operation.

  A common problem with progress dialogs is that it is difficult to know

  when to use them; operations take different amounts of time on different

  hardware.  QProgressDialog offers a solution to this problem:

  it estimates the time the operation will take (based on time for

  steps), and only shows itself if that estimate is beyond minimumDuration()

  (4 seconds by default).

  Use setMinimum() and setMaximum() or the constructor to set the number of

  "steps" in the operation and call setValue() as the operation

  progresses. The number of steps can be chosen arbitrarily. It can be the

  number of files copied, the number of bytes received, the number of

  iterations through the main loop of your algorithm, or some other

  suitable unit. Progress starts at the value set by setMinimum(),

  and the progress dialog shows that the operation has finished when

  you call setValue() with the value set by setMaximum() as its argument.

  The dialog automatically resets and hides itself at the end of the

  operation.  Use setAutoReset() and setAutoClose() to change this

  behavior. Note that if you set a new maximum (using setMaximum() or

  setRange()) that equals your current value(), the dialog will not

  close regardless.

  There are two ways of using QProgressDialog: modal and modeless.

  Compared to a modeless QProgressDialog, a modal QProgressDialog is simpler

  to use for the programmer. Do the operation in a loop, call \l setValue() at

  intervals, and check for cancellation with wasCanceled(). For example:

  \snippet doc/src/snippets/dialogs/dialogs.cpp 3

  A modeless progress dialog is suitable for operations that take

  place in the background, where the user is able to interact with the

  application. Such operations are typically based on QTimer (or

  QObject::timerEvent()), QSocketNotifier, or QUrlOperator; or performed

  in a separate thread. A QProgressBar in the status bar of your main window

  is often an alternative to a modeless progress dialog.

  You need to have an event loop to be running, connect the

  canceled() signal to a slot that stops the operation, and call \l

  setValue() at intervals. For example:

  \snippet doc/src/snippets/dialogs/dialogs.cpp 4

  \codeline

  \snippet doc/src/snippets/dialogs/dialogs.cpp 5

  \codeline

  \snippet doc/src/snippets/dialogs/dialogs.cpp 6

  In both modes the progress dialog may be customized by

  replacing the child widgets with custom widgets by using setLabel(),

  setBar(), and setCancelButton().

  The functions setLabelText() and setCancelButtonText()

  set the texts shown.

  \image plastique-progressdialog.png A progress dialog shown in the Plastique widget style.

  \sa QDialog, QProgressBar, {fowler}{GUI Design Handbook: Progress Indicator},

      {Find Files Example}, {Pixelator Example}

*/

/*!

  Constructs a progress dialog.

  Default settings:

  \list

  \i The label text is empty.

  \i The cancel button text is (translated) "Cancel".

  \i minimum is 0;

  \i maximum is 100

  \endlist

  The \a parent argument is dialog's parent widget. The widget flags, \a f, are

  passed to the QDialog::QDialog() constructor.

  \sa setLabelText(), setCancelButtonText(), setCancelButton(),

  setMinimum(), setMaximum()

*/

QProgressDialog::QProgressDialog(QWidget *parent, Qt::WindowFlags f)

    : QDialog(*(new QProgressDialogPrivate), parent, f)

{

    Q_D(QProgressDialog);

    d->useDefaultCancelText = true;

    d->init(QString::fromLatin1(""), QString(), 0, 100);

}

/*!

  Constructs a progress dialog.

   The \a labelText is the text used to remind the user what is progressing.

   The \a cancelButtonText is the text to display on the cancel button.  If 

   QString() is passed then no cancel button is shown.

   The \a minimum and \a maximum is the number of steps in the operation for

   which this progress dialog shows progress.  For example, if the

   operation is to examine 50 files, this value minimum value would be 0,

   and the maximum would be 50. Before examining the first file, call

   setValue(0). As each file is processed call setValue(1), setValue(2),

   etc., finally calling setValue(50) after examining the last file.

   The \a parent argument is the dialog's parent widget. The parent, \a parent, and

   widget flags, \a f, are passed to the QDialog::QDialog() constructor.

  \sa setLabelText(), setLabel(), setCancelButtonText(), setCancelButton(),

  setMinimum(), setMaximum()

*/

QProgressDialog::QProgressDialog(const QString &labelText,

                                 const QString &cancelButtonText,

                                 int minimum, int maximum,

                                 QWidget *parent, Qt::WindowFlags f)

    : QDialog(*(new QProgressDialogPrivate), parent, f)

{

    Q_D(QProgressDialog);

    d->init(labelText, cancelButtonText, minimum, maximum);

}

/*!

  Destroys the progress dialog.

*/

QProgressDialog::~QProgressDialog()

{

}

/*!

  \fn void QProgressDialog::canceled()

  This signal is emitted when the cancel button is clicked.

  It is connected to the cancel() slot by default.

  \sa wasCanceled()

*/

/*!

  Sets the label to \a label. The progress dialog resizes to fit. The

  label becomes owned by the progress dialog and will be deleted when

  necessary, so do not pass the address of an object on the stack.

  \sa setLabelText()

*/

void QProgressDialog::setLabel(QLabel *label)

{

    Q_D(QProgressDialog);

    delete d->label;

    d->label = label;

    if (label) {

        if (label->parentWidget() == this) {

            label->hide(); // until we resize

        } else {

            label->setParent(this, 0);

        }

    }

    int w = qMax(isVisible() ? width() : 0, sizeHint().width());

    int h = qMax(isVisible() ? height() : 0, sizeHint().height());

    resize(w, h);

    if (label)

        label->show();

}

/*!

  \property QProgressDialog::labelText

  \brief the label's text

  The default text is an empty string.

*/

QString QProgressDialog::labelText() const

{

    Q_D(const QProgressDialog);

    if (d->label)

        return d->label->text();

    return QString();

}

void QProgressDialog::setLabelText(const QString &text)

{

    Q_D(QProgressDialog);

    if (d->label) {

        d->label->setText(text);

        int w = qMax(isVisible() ? width() : 0, sizeHint().width());

        int h = qMax(isVisible() ? height() : 0, sizeHint().height());

        resize(w, h);

    }

}

/*!

  Sets the cancel button to the push button, \a cancelButton. The

  progress dialog takes ownership of this button which will be deleted

  when necessary, so do not pass the address of an object that is on

  the stack, i.e. use new() to create the button.  If 0 is passed then

  no cancel button will be shown.

  \sa setCancelButtonText()

*/

void QProgressDialog::setCancelButton(QPushButton *cancelButton)

{

    Q_D(QProgressDialog);

    delete d->cancel;

    d->cancel = cancelButton;

    if (cancelButton) {

        if (cancelButton->parentWidget() == this) {

            cancelButton->hide(); // until we resize

        } else {

            cancelButton->setParent(this, 0);

        }

        connect(d->cancel, SIGNAL(clicked()), this, SIGNAL(canceled()));

#ifndef QT_NO_SHORTCUT

        d->escapeShortcut = new QShortcut(Qt::Key_Escape, this, SIGNAL(canceled()));

#endif

    } else {

#ifndef QT_NO_SHORTCUT

        delete d->escapeShortcut;

        d->escapeShortcut = 0;

#endif

    }

    int w = qMax(isVisible() ? width() : 0, sizeHint().width());

    int h = qMax(isVisible() ? height() : 0, sizeHint().height());

    resize(w, h);

    if (cancelButton)

#if !defined(QT_SOFTKEYS_ENABLED)

        cancelButton->show();

#else

    {

        d->cancelAction = new QAction(cancelButton->text(), cancelButton);

        d->cancelAction->setSoftKeyRole(QAction::NegativeSoftKey);

        connect(d->cancelAction, SIGNAL(triggered()), this, SIGNAL(canceled()));

        addAction(d->cancelAction);

    }

#endif

}

/*!

  Sets the cancel button's text to \a cancelButtonText.  If the text

  is set to QString() then it will cause the cancel button to be 

  hidden and deleted.

  \sa setCancelButton()

*/

void QProgressDialog::setCancelButtonText(const QString &cancelButtonText)

{

    Q_D(QProgressDialog);

    d->useDefaultCancelText = false;

    if (!cancelButtonText.isNull()) {

        if (d->cancel) {

            d->cancel->setText(cancelButtonText);

#ifdef QT_SOFTKEYS_ENABLED

            d->cancelAction->setText(cancelButtonText);

#endif

        } else {

            setCancelButton(new QPushButton(cancelButtonText, this));

        }

    } else {

        setCancelButton(0);

    }

    int w = qMax(isVisible() ? width() : 0, sizeHint().width());

    int h = qMax(isVisible() ? height() : 0, sizeHint().height());

    resize(w, h);

}

/*!

  Sets the progress bar widget to \a bar. The progress dialog resizes to

  fit. The progress dialog takes ownership of the progress \a bar which

  will be deleted when necessary, so do not use a progress bar

  allocated on the stack.

*/

void QProgressDialog::setBar(QProgressBar *bar)

{

    Q_D(QProgressDialog);

    if (!bar) {

        qWarning("QProgressDialog::setBar: Cannot set a null progress bar");

        return;

    }

#ifndef QT_NO_DEBUG

    if (value() > 0)

        qWarning("QProgressDialog::setBar: Cannot set a new progress bar "

                  "while the old one is active");

#endif

    delete d->bar;

    d->bar = bar;

    int w = qMax(isVisible() ? width() : 0, sizeHint().width());

    int h = qMax(isVisible() ? height() : 0, sizeHint().height());

    resize(w, h);

}

/*!

  \property QProgressDialog::wasCanceled

  \brief whether the dialog was canceled

*/

bool QProgressDialog::wasCanceled() const

{

    Q_D(const QProgressDialog);

    return d->cancellation_flag;

}