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qdialog.cpp

/****************************************************************************
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
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** If you are unsure which license is appropriate for your use, please
** review the following information:
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**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************/

#include "qdialog.h"


#include "qevent.h"
#include "qdesktopwidget.h"
#include "qpushbutton.h"
#include "qapplication.h"
#include "qlayout.h"
#include "qsizegrip.h"
#include "qwhatsthis.h"
#include "qmenu.h"
#include "qcursor.h"
#include "private/qdialog_p.h"
#ifndef QT_NO_ACCESSIBILITY
#include "qaccessible.h"
#endif
#if defined(Q_OS_TEMP)
#include "qt_windows.h"
#elif defined(Q_WS_X11)
#  include "../kernel/qt_x11_p.h"
#endif

/*!
    \class QDialog
    \brief The QDialog class is the base class of dialog windows.

    \ingroup dialogs
    \ingroup abstractwidgets
    \mainclass

    A dialog window is a top-level window mostly used for short-term
    tasks and brief communications with the user. QDialogs may be
    modal or modeless. QDialogs can
    provide a \link #return return
    value\endlink, and they can have \link #default default
    buttons\endlink. QDialogs can also have a QSizeGrip in their
    lower-right corner, using setSizeGripEnabled().

    Note that QDialog (an any other widget that has type Qt::Dialog) uses
    the parent widget slightly differently from other classes in Qt. A
    dialog is always a top-level widget, but if it has a parent, its
    default location is centered on top of the parent's top-level widget
    (if it is not top-level itself). It will also share the parent's
    taskbar entry.

    Use the overload of the QWidget::setParent() function to change
    the ownership of a QDialog widget. This function allows you to
    explicitly set the window flags of the reparented widget; using
    the overloaded function will clear the window flags specifying the
    window-system properties for the widget (in particular it will
    reset the Qt::Dialog flag).

    \section1 Modal Dialogs

    A \bold{modal} dialog is a dialog that blocks input to other
    visible windows in the same application. Users must finish
    interacting with the dialog and close it before they can access
    any other window in the application. Dialogs that are used to
    request a file name from the user or that are used to set
    application preferences are usually modal.

    The most common way to display a modal dialog is to call its
    exec() function. When the user closes the dialog, exec() will
    provide a useful \link #return return value\endlink. Typically,
    to get the dialog to close and return the appropriate value, we
    connect a default button, e.g. \gui OK, to the accept() slot and a
    \gui Cancel button to the reject() slot.
    Alternatively you can call the done() slot with \c Accepted or
    \c Rejected.

    An alternative is to call setModal(true) or setWindowModality(),
    then show(). Unlike exec(), show() returns control to the caller
    immediately. Calling setModal(true) is especially useful for
    progress dialogs, where the user must have the ability to interact
    with the dialog, e.g.  to cancel a long running operation. If you
    use show() and setModal(true) together to perform a long operation,
    you must call QApplication::processEvents() periodically during
    processing to enable the user to interact with the dialog. (See
    QProgressDialog.)

    \section1 Modeless Dialogs

    A \bold{modeless} dialog is a dialog that operates
    independently of other windows in the same application. Find and
    replace dialogs in word-processors are often modeless to allow the
    user to interact with both the application's main window and with
    the dialog.

    Modeless dialogs are displayed using show(), which returns control
    to the caller immediately.

    \target default
    \section1 Default Button

    A dialog's \e default button is the button that's pressed when the
    user presses Enter (Return). This button is used to signify that
    the user accepts the dialog's settings and wants to close the
    dialog. Use QPushButton::setDefault(), QPushButton::isDefault()
    and QPushButton::autoDefault() to set and control the dialog's
    default button.

    \target escapekey
    \section1 Escape Key

    If the user presses the Esc key in a dialog, QDialog::reject()
    will be called. This will cause the window to close: The \link
    QCloseEvent close event \endlink cannot be \link
    QCloseEvent::ignore() ignored \endlink.

    \section1 Extensibility

    Extensibility is the ability to show the dialog in two ways: a
    partial dialog that shows the most commonly used options, and a
    full dialog that shows all the options. Typically an extensible
    dialog will initially appear as a partial dialog, but with a
    \gui More toggle button. If the user presses the \gui More button down,
    the dialog is expanded. The \l{Extension Example} shows how to achieve
    extensible dialogs using Qt.

    \target return
    \section1 Return Value (Modal Dialogs)

    Modal dialogs are often used in situations where a return value is
    required, e.g. to indicate whether the user pressed \gui OK or
    \gui Cancel. A dialog can be closed by calling the accept() or the
    reject() slots, and exec() will return \c Accepted or \c Rejected
    as appropriate. The exec() call returns the result of the dialog.
    The result is also available from result() if the dialog has not
    been destroyed.

    \target examples
    \section1 Code Examples

    A modal dialog:

    \quotefunction snippets/dialogs/dialogs.cpp void EditorWindow::countWords()

    A modeless dialog:

    \quotefunction snippets/dialogs/dialogs.cpp void EditorWindow::find()

    \sa QDialogButtonBox, QTabDialog, QWidget, QProgressDialog,
        {fowler}{GUI Design Handbook: Dialogs, Standard}, {Extension Example},
        {Standard Dialogs Example}
*/

/*! \enum QDialog::DialogCode

    The value returned by a modal dialog.

    \value Accepted
    \value Rejected
*/

/*!
  \property QDialog::sizeGripEnabled
  \brief whether the size grip is enabled

  A QSizeGrip is placed in the bottom-right corner of the dialog when this
  property is enabled. By default, the size grip is disabled.
*/


/*!
  Constructs a dialog with parent \a parent.

  A dialog is always a top-level widget, but if it has a parent, its
  default location is centered on top of the parent. It will also
  share the parent's taskbar entry.

  The widget flags \a f are passed on to the QWidget constructor.
  If, for example, you don't want a What's This button in the title bar
  of the dialog, pass Qt::WindowTitleHint | Qt::WindowSystemMenuHint in \a f.

  \sa QWidget::setWindowFlags()
*/

00201 QDialog::QDialog(QWidget *parent, Qt::WindowFlags f)
    : QWidget(*new QDialogPrivate, parent,
              f | QFlag((f & Qt::WindowType_Mask) == 0 ? Qt::Dialog : 0))
{
}

#ifdef QT3_SUPPORT
/*!
    \overload
    \obsolete
*/
QDialog::QDialog(QWidget *parent, const char *name, bool modal, Qt::WindowFlags f)
    : QWidget(*new QDialogPrivate, parent,
              f
              | QFlag(modal ? Qt::WShowModal : 0)
              | QFlag((f & Qt::WindowType_Mask) == 0 ? Qt::Dialog : 0)
        )
{
    setObjectName(QString::fromAscii(name));
}
#endif

/*!
  \overload
  \internal
*/
00227 QDialog::QDialog(QDialogPrivate &dd, QWidget *parent, Qt::WindowFlags f)
    : QWidget(dd, parent, f | QFlag((f & Qt::WindowType_Mask) == 0 ? Qt::Dialog : 0))
{
}

/*!
  Destroys the QDialog, deleting all its children.
*/

00236 QDialog::~QDialog()
{
    // Need to hide() here, as our (to-be) overridden hide()
    // will not be called in ~QWidget.
    hide();
}

/*!
  \internal
  This function is called by the push button \a pushButton when it
  becomes the default button. If \a pushButton is 0, the dialogs
  default default button becomes the default button. This is what a
  push button calls when it loses focus.
*/
void QDialogPrivate::setDefault(QPushButton *pushButton)
{
    Q_Q(QDialog);
    bool hasMain = false;
    QList<QPushButton*> list = qFindChildren<QPushButton*>(q);
    for (int i=0; i<list.size(); ++i) {
        QPushButton *pb = list.at(i);
        if (pb->window() == q) {
            if (pb == mainDef)
                hasMain = true;
            if (pb != pushButton)
                pb->setDefault(false);
        }
    }
    if (!pushButton && hasMain)
        mainDef->setDefault(true);
    if (!hasMain)
        mainDef = pushButton;
}

/*!
  \internal
  This function sets the default default pushbutton to \a pushButton.
  This function is called by QPushButton::setDefault().
*/
void QDialogPrivate::setMainDefault(QPushButton *pushButton)
{
    mainDef = 0;
    setDefault(pushButton);
}

/*!
  \internal
  Hides the default button indicator. Called when non auto-default
  push button get focus.
 */
void QDialogPrivate::hideDefault()
{
    Q_Q(QDialog);
    QList<QPushButton*> list = qFindChildren<QPushButton*>(q);
    for (int i=0; i<list.size(); ++i) {
        list.at(i)->setDefault(false);
    }
}

#ifdef Q_OS_TEMP
# include "qmessagebox.h"
extern const char * mb_texts[]; // Defined in qmessagebox.cpp
/*!
  \internal
  Hides special buttons which are rather shown in the title bar
  on WinCE, to conserve screen space.
*/
void QDialog::hideSpecial()
{
    // "OK"     buttons are hidden, and (Ok) shown on title bar
    // "Cancel" buttons are hidden, and (X)  shown on title bar
    // "Help"   buttons are hidden, and (?)  shown on title bar
    bool showOK = false,
         showX  = false,
         showQ  = false;
    QList<QPushButton*> list = qFindChildren<QPushButton*>(this);
    for (int i=0; i<list.size(); ++i) {
        QPushButton *pb = list.at(i);
        if (!showOK && pb->text() == qApp->translate("QMessageBox", mb_texts[QMessageBox::Ok])) {
            pb->hide();
            showOK = true;
        } else if (!showX && pb->text() == qApp->translate("QMessageBox", mb_texts[QMessageBox::Cancel])) {
            pb->hide();
            showX = true;
        } else if (!showQ && pb->text() == qApp->translate("QMessageBox", "Help")) {
            pb->hide();
            showQ = true;
        }
    }
    if (showOK || showQ) {
        DWORD ext = GetWindowLong(winId(), GWL_EXSTYLE);
        ext |= showOK ? WS_EX_CAPTIONOKBTN : 0;
        ext |= showQ  ? WS_EX_CONTEXTHELP: 0;
        SetWindowLong(winId(), GWL_EXSTYLE, ext);
    }
    if (!showX) {
        DWORD ext = GetWindowLong(winId(), GWL_STYLE);
        ext &= ~WS_SYSMENU;
        SetWindowLong(winId(), GWL_STYLE, ext);
    }
}
#endif

/*!
  Returns the modal dialog's result code, \c Accepted or \c Rejected.

  Do not call this function if the dialog was constructed with the
  Qt::WA_DeleteOnClose attribute.
*/
00345 int QDialog::result() const
{
    Q_D(const QDialog);
    return d->rescode;
}

/*!
  \fn void QDialog::setResult(int i)

  Sets the modal dialog's result code to \a i.
*/
00356 void QDialog::setResult(int r)
{
    Q_D(QDialog);
    d->rescode = r;
}


/*!
    Shows the dialog as a \l{QDialog#Modal Dialogs}{modal dialog},
    blocking until the user closes it. The function returns a \l
    DialogCode result.

    Users cannot interact with any other window in the same
    application until they close the dialog.

  \sa show(), result()
*/

00374 int QDialog::exec()
{
    Q_D(QDialog);
    if (d->eventLoop) {
        qWarning("QDialog::exec: Recursive call detected");
        return -1;
    }

    bool deleteOnClose = testAttribute(Qt::WA_DeleteOnClose);
    setAttribute(Qt::WA_DeleteOnClose, false);

    bool wasShowModal = testAttribute(Qt::WA_ShowModal);
    setAttribute(Qt::WA_ShowModal, true);
    setResult(0);

    show();

    QEventLoop eventLoop;
    d->eventLoop = &eventLoop;
    (void) eventLoop.exec();
    d->eventLoop = 0;

    setAttribute(Qt::WA_ShowModal, wasShowModal);

    int res = result();
    if (deleteOnClose)
        delete this;
    return res;
}


/*! Closes the dialog and sets its result code to \a r. If this dialog
  is shown with exec(), done() causes the local event loop to finish,
  and exec() to return \a r.

  As with QWidget::close(), done() deletes the dialog if the
  Qt::WA_DeleteOnClose flag is set. If the dialog is the application's
  main widget, the application terminates. If the dialog is the
  last window closed, the QApplication::lastWindowClosed() signal is
  emitted.

  \sa accept(), reject(), QApplication::activeWindow(), QApplication::quit()
*/

00418 void QDialog::done(int r)
{
    Q_D(QDialog);
    hide();
    setResult(r);
    d->close_helper(QWidgetPrivate::CloseNoEvent);
    emit finished(r);
    if (r == Accepted)
        emit accepted();
    else if (r == Rejected)
        emit rejected();
}

/*!
  Hides the modal dialog and sets the result code to \c Accepted.

  \sa reject() done()
*/

00437 void QDialog::accept()
{
    done(Accepted);
}

/*!
  Hides the modal dialog and sets the result code to \c Rejected.

  \sa accept() done()
*/

00448 void QDialog::reject()
{
    done(Rejected);
}

/*! \reimp */
00454 bool QDialog::eventFilter(QObject *o, QEvent *e)
{
    return QWidget::eventFilter(o, e);
}

/*****************************************************************************
  Event handlers
 *****************************************************************************/

/*! \reimp */
00464 void QDialog::contextMenuEvent(QContextMenuEvent *e)
{
#if defined(QT_NO_WHATSTHIS) || defined(QT_NO_MENU)
    Q_UNUSED(e);
#else
    QWidget *w = childAt(e->pos());
    if (!w) {
        w = rect().contains(e->pos()) ? this : 0;
        if (!w)
            return;
    }
    while (w && w->whatsThis().size() == 0 && !w->testAttribute(Qt::WA_CustomWhatsThis))
        w = w->isWindow() ? 0 : w->parentWidget();
    if (w) {
        QMenu p;
        QAction *wt = p.addAction(tr("What's This?"));
        if (p.exec(e->globalPos()) == wt) {
            QHelpEvent e(QEvent::WhatsThis, w->rect().center(),
                         w->mapToGlobal(w->rect().center()));
            QApplication::sendEvent(w, &e);
        }
    }
#endif
}

/*! \reimp */
00490 void QDialog::keyPressEvent(QKeyEvent *e)
{
    //   Calls reject() if Escape is pressed. Simulates a button
    //   click for the default button if Enter is pressed. Move focus
    //   for the arrow keys. Ignore the rest.
#ifdef Q_WS_MAC
    if(e->modifiers() == Qt::ControlModifier && e->key() == Qt::Key_Period) {
        reject();
    } else
#endif
    if (!e->modifiers() || (e->modifiers() & Qt::KeypadModifier && e->key() == Qt::Key_Enter)) {
        switch (e->key()) {
        case Qt::Key_Enter:
        case Qt::Key_Return: {
            QList<QPushButton*> list = qFindChildren<QPushButton*>(this);
            for (int i=0; i<list.size(); ++i) {
                QPushButton *pb = list.at(i);
                if (pb->isDefault() && pb->isVisible()) {
                    if (pb->isEnabled())
                        pb->click();
                    return;
                }
            }
        }
        break;
        case Qt::Key_Escape:
            reject();
            break;
        case Qt::Key_Up:
        case Qt::Key_Left:
            if (focusWidget() &&
                 (focusWidget()->focusPolicy() == Qt::StrongFocus ||
                   focusWidget()->focusPolicy() == Qt::WheelFocus)) {
                e->ignore();
                break;
            }
            // call ours, since c++ blocks us from calling the one
            // belonging to focusWidget().
            focusNextPrevChild(false);
            break;
        case Qt::Key_Down:
        case Qt::Key_Right:
            if (focusWidget() &&
                 (focusWidget()->focusPolicy() == Qt::StrongFocus ||
                   focusWidget()->focusPolicy() == Qt::WheelFocus)) {
                e->ignore();
                break;
            }
            focusNextPrevChild(true);
            break;
        default:
            e->ignore();
            return;
        }
    } else {
        e->ignore();
    }
}

/*! \reimp */
00550 void QDialog::closeEvent(QCloseEvent *e)
{
#ifndef QT_NO_WHATSTHIS
    if (isModal() && QWhatsThis::inWhatsThisMode())
        QWhatsThis::leaveWhatsThisMode();
#endif
    if (isVisible())
        reject();
    else
        e->accept();
}

#ifdef Q_OS_TEMP
/*! \internal
    \reimp
*/
bool QDialog::event(QEvent *e)
{
    switch (e->type()) {
    case QEvent::OkRequest:
    case QEvent::HelpRequest: {
        QString bName =
            (e->type() == QEvent::OkRequest)
            ? qApp->translate("QMessageBox", mb_texts[QMessageBox::Ok])
            : qApp->translate("QMessageBox", "Help");
        QList<QPushButton*> list = qFindChildren<QPushButton*>(this);
        for (int i=0; i<list.size(); ++i) {
            QPushButton *pb = list.at(i);
            if (pb->text() == bName) {
                if (pb->isEnabled())
                    pb->click();
                return pb->isEnabled();
            }
        } }
    default: break;
    }
    return QWidget::event(e);
}
#endif


/*****************************************************************************
  Geometry management.
 *****************************************************************************/

/*! \reimp
*/

00598 void QDialog::setVisible(bool visible)
{
    Q_D(QDialog);
    if (visible) {
        if (isVisible())
            return;

#ifdef Q_OS_TEMP
        hideSpecial();
#endif

        if (!testAttribute(Qt::WA_Moved)) {
            Qt::WindowStates state = windowState();
            adjustPosition(parentWidget());
            setAttribute(Qt::WA_Moved, false); // not really an explicit position
            if (state != windowState())
                setWindowState(state);
        }
        QWidget::setVisible(visible);
        showExtension(d->doShowExtension);
        QWidget *fw = window()->focusWidget();
        if (!fw)
            fw = this;

        /*
          The following block is to handle a special case, and does not
          really follow propper logic in concern of autoDefault and TAB
          order. However, it's here to ease usage for the users. If a
          dialog has a default QPushButton, and first widget in the TAB
          order also is a QPushButton, then we give focus to the main
          default QPushButton. This simplifies code for the developers,
          and actually catches most cases... If not, then they simply
          have to use [widget*]->setFocus() themselves...
        */
        if (d->mainDef && fw->focusPolicy() == Qt::NoFocus) {
            QWidget *first = fw;
            while ((first = first->nextInFocusChain()) != fw && first->focusPolicy() == Qt::NoFocus)
                ;
            if (first != d->mainDef && qobject_cast<QPushButton*>(first))
                d->mainDef->setFocus();
        }
        if (!d->mainDef && isWindow()) {
            QWidget *w = fw;
            while ((w = w->nextInFocusChain()) != fw) {
                QPushButton *pb = qobject_cast<QPushButton *>(w);
                if (pb && pb->autoDefault() && pb->focusPolicy() != Qt::NoFocus) {
                    pb->setDefault(true);
                    break;
                }
            }
        }
        if (fw && !fw->hasFocus()) {
            QFocusEvent e(QEvent::FocusIn, Qt::TabFocusReason);
            QApplication::sendEvent(fw, &e);
        }

#ifndef QT_NO_ACCESSIBILITY
        QAccessible::updateAccessibility(this, 0, QAccessible::DialogStart);
#endif

    } else {
        if (!isVisible())
            return;

#ifndef QT_NO_ACCESSIBILITY
        if (isVisible())
            QAccessible::updateAccessibility(this, 0, QAccessible::DialogEnd);
#endif

        // Reimplemented to exit a modal event loop when the dialog is hidden.
        QWidget::setVisible(visible);
        if (d->eventLoop)
            d->eventLoop->exit();
    }
}

/*!\reimp */
00675 void QDialog::showEvent(QShowEvent *event)
{
    if (!event->spontaneous() && !testAttribute(Qt::WA_Moved)) {
      Qt::WindowStates  state = windowState();
        adjustPosition(parentWidget());
        setAttribute(Qt::WA_Moved, false); // not really an explicit position
      if (state != windowState())
          setWindowState(state);
    }
}

/*! \internal */
00687 void QDialog::adjustPosition(QWidget* w)
{
#ifdef Q_WS_X11
    // defined in qapplication_x11.cpp
    extern bool qt_net_supports(Atom atom);

    // if the WM advertises that it will place the windows properly for us, let it do it :)
    if (qt_net_supports(ATOM(_NET_WM_FULL_PLACEMENT)))
        return;
#endif

    QPoint p(0, 0);
    int extraw = 0, extrah = 0, scrn = 0;
    if (w)
        w = w->window();
    QRect desk;
    if (w) {
        scrn = QApplication::desktop()->screenNumber(w);
    } else if (QApplication::desktop()->isVirtualDesktop()) {
        scrn = QApplication::desktop()->screenNumber(QCursor::pos());
    } else {
        scrn = QApplication::desktop()->screenNumber(this);
    }
    desk = QApplication::desktop()->availableGeometry(scrn);

    QWidgetList list = QApplication::topLevelWidgets();
    for (int i = 0; (extraw == 0 || extrah == 0) && i < list.size(); ++i) {
        QWidget * current = list.at(i);
        if (current->isVisible()) {
            int framew = current->geometry().x() - current->x();
            int frameh = current->geometry().y() - current->y();

            extraw = qMax(extraw, framew);
            extrah = qMax(extrah, frameh);
        }
    }

    // sanity check for decoration frames. With embedding, we
    // might get extraordinary values
    if (extraw == 0 || extrah == 0 || extraw >= 10 || extrah >= 40) {
        extrah = 40;
        extraw = 10;
    }

#ifndef Q_OS_TEMP
    if (w) {
        // Use mapToGlobal rather than geometry() in case w might
        // be embedded in another application
        QPoint pp = w->mapToGlobal(QPoint(0,0));
        p = QPoint(pp.x() + w->width()/2,
                    pp.y() + w->height()/ 2);
    } else {
        // p = middle of the desktop
        p = QPoint(desk.x() + desk.width()/2, desk.y() + desk.height()/2);
    }
#else
    p = QPoint(desk.x() + desk.width()/2, desk.y() + desk.height()/2);
#endif

    // p = origin of this
    p = QPoint(p.x()-width()/2 - extraw,
                p.y()-height()/2 - extrah);


    if (p.x() + extraw + width() > desk.x() + desk.width())
        p.setX(desk.x() + desk.width() - width() - extraw);
    if (p.x() < desk.x())
        p.setX(desk.x());

    if (p.y() + extrah + height() > desk.y() + desk.height())
        p.setY(desk.y() + desk.height() - height() - extrah);
    if (p.y() < desk.y())
        p.setY(desk.y());

    move(p);
}


/*!
    \obsolete

    If \a orientation is Qt::Horizontal, the extension will be displayed
    to the right of the dialog's main area. If \a orientation is
    Qt::Vertical, the extension will be displayed below the dialog's main
    area.

    Instead of using this functionality, we recommend that you simply call
    show() or hide() on the part of the dialog that you want to use as an
    extension. See the \l{Extension Example} for details.

    \sa setExtension()
*/
00779 void QDialog::setOrientation(Qt::Orientation orientation)
{
    Q_D(QDialog);
    d->orientation = orientation;
}

/*!
    \obsolete

    Returns the dialog's extension orientation.

    Instead of using this functionality, we recommend that you simply call
    show() or hide() on the part of the dialog that you want to use as an
    extension. See the \l{Extension Example} for details.

    \sa extension()
*/
00796 Qt::Orientation QDialog::orientation() const
{
    Q_D(const QDialog);
    return d->orientation;
}

/*!
    \obsolete

    Sets the widget, \a extension, to be the dialog's extension,
    deleting any previous extension. The dialog takes ownership of the
    extension. Note that if 0 is passed any existing extension will be
    deleted. This function must only be called while the dialog is hidden.

    Instead of using this functionality, we recommend that you simply call
    show() or hide() on the part of the dialog that you want to use as an
    extension. See the \l{Extension Example} for details.

    \sa showExtension(), setOrientation()
*/
00816 void QDialog::setExtension(QWidget* extension)
{
    Q_D(QDialog);
    delete d->extension;
    d->extension = extension;

    if (!extension)
        return;

    if (extension->parentWidget() != this)
        extension->setParent(this);
    extension->hide();
}

/*!
    \obsolete

    Returns the dialog's extension or 0 if no extension has been
    defined.

    Instead of using this functionality, we recommend that you simply call
    show() or hide() on the part of the dialog that you want to use as an
    extension. See the \l{Extension Example} for details.

    \sa showExtension(), setOrientation()
*/
00842 QWidget* QDialog::extension() const
{
    Q_D(const QDialog);
    return d->extension;
}


/*!
    \obsolete

    If \a showIt is true, the dialog's extension is shown; otherwise the
    extension is hidden.

    Instead of using this functionality, we recommend that you simply call
    show() or hide() on the part of the dialog that you want to use as an
    extension. See the \l{Extension Example} for details.

    \sa show(), setExtension(), setOrientation()
*/
00861 void QDialog::showExtension(bool showIt)
{
    Q_D(QDialog);
    d->doShowExtension = showIt;
    if (!d->extension)
        return;
    if (!testAttribute(Qt::WA_WState_Visible))
        return;
    if (d->extension->isVisible() == showIt)
        return;

    if (showIt) {
        d->size = size();
        d->min = minimumSize();
        d->max = maximumSize();
        if (layout())
            layout()->setEnabled(false);
        QSize s(d->extension->sizeHint()
                 .expandedTo(d->extension->minimumSize())
                 .boundedTo(d->extension->maximumSize()));
        if (d->orientation == Qt::Horizontal) {
            int h = qMax(height(), s.height());
            d->extension->setGeometry(width(), 0, s.width(), h);
            setFixedSize(width() + s.width(), h);
        } else {
            int w = qMax(width(), s.width());
            d->extension->setGeometry(0, height(), w, s.height());
            setFixedSize(w, height() + s.height());
        }
        d->extension->show();
    } else {
        d->extension->hide();
        // workaround for CDE window manager that won't shrink with (-1,-1)
        setMinimumSize(d->min.expandedTo(QSize(1, 1)));
        setMaximumSize(d->max);
        resize(d->size);
        if (layout())
            layout()->setEnabled(true);
    }
}


/*! \reimp */
00904 QSize QDialog::sizeHint() const
{
    Q_D(const QDialog);
    if (d->extension)
        if (d->orientation == Qt::Horizontal)
            return QSize(QWidget::sizeHint().width(),
                        qMax(QWidget::sizeHint().height(),d->extension->sizeHint().height()));
        else
            return QSize(qMax(QWidget::sizeHint().width(), d->extension->sizeHint().width()),
                        QWidget::sizeHint().height());

    return QWidget::sizeHint();
}


/*! \reimp */
00920 QSize QDialog::minimumSizeHint() const
{
    Q_D(const QDialog);
    if (d->extension)
        if (d->orientation == Qt::Horizontal)
            return QSize(QWidget::minimumSizeHint().width(),
                        qMax(QWidget::minimumSizeHint().height(), d->extension->minimumSizeHint().height()));
        else
            return QSize(qMax(QWidget::minimumSizeHint().width(), d->extension->minimumSizeHint().width()),
                        QWidget::minimumSizeHint().height());

    return QWidget::minimumSizeHint();
}

/*!
    \property QDialog::modal
    \brief whether show() should pop up the dialog as modal or modeless

    By default, this property is false and show() pops up the dialog
    as modeless. Setting his property to true is equivalent to setting
    QWidget::windowModality to Qt::ApplicationModal.

    exec() ignores the value of this property and always pops up the
    dialog as modal.

    \sa QWidget::windowModality, show(), exec()
*/

void QDialog::setModal(bool modal)
{
    setAttribute(Qt::WA_ShowModal, modal);
}


bool QDialog::isSizeGripEnabled() const
{
#ifndef QT_NO_SIZEGRIP
    Q_D(const QDialog);
    return !!d->resizer;
#else
    return false;
#endif
}


void QDialog::setSizeGripEnabled(bool enabled)
{
#ifdef QT_NO_SIZEGRIP
    Q_UNUSED(enabled);
#else
    Q_D(QDialog);
    if (!enabled != !d->resizer) {
        if (enabled) {
            d->resizer = new QSizeGrip(this);
            // adjustSize() processes all events, which is suboptimal
            d->resizer->resize(d->resizer->sizeHint());
            if (isRightToLeft())
                d->resizer->move(rect().bottomLeft() -d->resizer->rect().bottomLeft());
            else
                d->resizer->move(rect().bottomRight() -d->resizer->rect().bottomRight());
            d->resizer->lower();
            d->resizer->show();
        } else {
            delete d->resizer;
            d->resizer = 0;
        }
    }
#endif //QT_NO_SIZEGRIP
}



/*! \reimp */
00993 void QDialog::resizeEvent(QResizeEvent *)
{
#ifndef QT_NO_SIZEGRIP
    Q_D(QDialog);
    if (d->resizer) {
        if (isRightToLeft())
            d->resizer->move(rect().bottomLeft() -d->resizer->rect().bottomLeft());
        else
            d->resizer->move(rect().bottomRight() -d->resizer->rect().bottomRight());
        d->resizer->lower();
    }
#endif
}

/*! \fn void QDialog::finished(int result)
    \since 4.1

    This signal is emitted when the dialog's \a result code has been
    set, either by the user or by calling done(), accept(), or
    reject().

    Note that this signal is \e not emitted when hiding the dialog
    with hide() or setVisible(false). This includes deleting the
    dialog while it is visible.

    \sa accepted(), rejected()
*/

/*! \fn void QDialog::accepted()
    \since 4.1

    This signal is emitted when the dialog has been accepted either by
    the user or by calling accept() or done() with the
    QDialog::Accepted argument.

    Note that this signal is \e not emitted when hiding the dialog
    with hide() or setVisible(false). This includes deleting the
    dialog while it is visible.

    \sa finished(), rejected()
*/

/*! \fn void QDialog::rejected()
    \since 4.1

    This signal is emitted when the dialog has been rejected either by
    the user or by calling reject() or done() with the
    QDialog::Rejected argument.

    Note that this signal is \e not emitted when hiding the dialog
    with hide() or setVisible(false). This includes deleting the
    dialog while it is visible.

    \sa finished(), accepted()
*/

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