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#include "qsplashscreen.h"

#ifndef QT_NO_SPLASHSCREEN

#include "qapplication.h"

#include "qdesktopwidget.h"

#include "qpainter.h"

#include "qpixmap.h"

#include "qtextdocument.h"

#include "qtextcursor.h"

#include <QtCore/qdebug.h>

#include <private/qwidget_p.h>

QT_BEGIN_NAMESPACE

class QSplashScreenPrivate : public QWidgetPrivate

{

    Q_DECLARE_PUBLIC(QSplashScreen)

public:

    QPixmap pixmap;

    QString currStatus;

    QColor currColor;

    int currAlign;

    inline QSplashScreenPrivate();

    void drawContents();

};

/*!

   \class QSplashScreen

   \brief The QSplashScreen widget provides a splash screen that can

   be shown during application startup.

   A splash screen is a widget that is usually displayed when an

   application is being started. Splash screens are often used for

   applications that have long start up times (e.g. database or

   networking applications that take time to establish connections) to

   provide the user with feedback that the application is loading.

   The splash screen appears in the center of the screen. It may be

   useful to add the Qt::WindowStaysOnTopHint to the splash widget's

   window flags if you want to keep it above all the other windows on

   the desktop.

   Some X11 window managers do not support the "stays on top" flag. A

   solution is to set up a timer that periodically calls raise() on

   the splash screen to simulate the "stays on top" effect.

   The most common usage is to show a splash screen before the main

   widget is displayed on the screen. This is illustrated in the

   following code snippet in which a splash screen is displayed and

   some initialization tasks are performed before the application's

   main window is shown:

   \snippet doc/src/snippets/qsplashscreen/main.cpp 0

   \dots

   \snippet doc/src/snippets/qsplashscreen/main.cpp 1

   The user can hide the splash screen by clicking on it with the

   mouse. Since the splash screen is typically displayed before the

   event loop has started running, it is necessary to periodically

   call QApplication::processEvents() to receive the mouse clicks.

   It is sometimes useful to update the splash screen with messages,

   for example, announcing connections established or modules loaded

   as the application starts up:

   \snippet doc/src/snippets/code/src_gui_widgets_qsplashscreen.cpp 0

   QSplashScreen supports this with the showMessage() function. If you

   wish to do your own drawing you can get a pointer to the pixmap

   used in the splash screen with pixmap().  Alternatively, you can

   subclass QSplashScreen and reimplement drawContents().

*/

/*!

    Construct a splash screen that will display the \a pixmap.

    There should be no need to set the widget flags, \a f, except

    perhaps Qt::WindowStaysOnTopHint.

*/

QSplashScreen::QSplashScreen(const QPixmap &pixmap, Qt::WindowFlags f)

    : QWidget(*(new QSplashScreenPrivate()), 0, Qt::SplashScreen | f)

{

    d_func()->pixmap = pixmap;

    setPixmap(d_func()->pixmap);  // Does an implicit repaint

}

/*!

    \overload

    This function allows you to specify a parent for your splashscreen. The

    typical use for this constructor is if you have a multiple screens and

    prefer to have the splash screen on a different screen than your primary

    one. In that case pass the proper desktop() as the \a parent.

*/

QSplashScreen::QSplashScreen(QWidget *parent, const QPixmap &pixmap, Qt::WindowFlags f)

    : QWidget(*new QSplashScreenPrivate, parent, Qt::SplashScreen | f)

{

    d_func()->pixmap = pixmap;

    setPixmap(d_func()->pixmap);  // Does an implicit repaint

}

/*!

  Destructor.

*/

QSplashScreen::~QSplashScreen()

{

}

/*!

    \reimp

*/

void QSplashScreen::mousePressEvent(QMouseEvent *)

{

    hide();

}

/*!

    This overrides QWidget::repaint(). It differs from the standard

    repaint function in that it also calls QApplication::flush() to

    ensure the updates are displayed, even when there is no event loop

    present.

*/

void QSplashScreen::repaint()

{

    d_func()->drawContents();

    QWidget::repaint();

    QApplication::flush();

}

/*!

    \fn QSplashScreen::messageChanged(const QString &message)

    This signal is emitted when the message on the splash screen

    changes. \a message is the new message and is a null-string

    when the message has been removed.

    \sa showMessage(), clearMessage()

*/

/*!

    Draws the \a message text onto the splash screen with color \a

    color and aligns the text according to the flags in \a alignment.

    \sa Qt::Alignment, clearMessage()

*/

void QSplashScreen::showMessage(const QString &message, int alignment,

                                const QColor &color)

{

    Q_D(QSplashScreen);

    d->currStatus = message;

    d->currAlign = alignment;

    d->currColor = color;

    emit messageChanged(d->currStatus);

    repaint();

}

/*!

    Removes the message being displayed on the splash screen

    \sa showMessage()

 */

void QSplashScreen::clearMessage()

{

    d_func()->currStatus.clear();

    emit messageChanged(d_func()->currStatus);

    repaint();

}

/*!

    Makes the splash screen wait until the widget \a mainWin is displayed

    before calling close() on itself.

*/

void QSplashScreen::finish(QWidget *mainWin)

{

    if (mainWin) {

#if defined(Q_WS_X11)

        extern void qt_x11_wait_for_window_manager(QWidget *mainWin);

        qt_x11_wait_for_window_manager(mainWin);

#endif

    }

    close();

}

/*!

    Sets the pixmap that will be used as the splash screen's image to

    \a pixmap.

*/

void QSplashScreen::setPixmap(const QPixmap &pixmap)

{

    Q_D(QSplashScreen);

    if (pixmap.hasAlpha()) {

        QPixmap opaque(pixmap.size());

        QPainter p(&opaque);

        p.fillRect(0, 0, pixmap.width(), pixmap.height(), palette().background());

        p.drawPixmap(0, 0, pixmap);

        p.end();

        d->pixmap = opaque;

    } else {

        d->pixmap = pixmap;

    }

    QRect r(0, 0, d->pixmap.size().width(), d->pixmap.size().height());

    resize(d->pixmap.size());

    move(QApplication::desktop()->screenGeometry().center() - r.center());

    if (!isVisible())

        d->drawContents();

    else

        repaint();

}

/*!

    Returns the pixmap that is used in the splash screen. The image

    does not have any of the text drawn by showMessage() calls.

*/

const QPixmap QSplashScreen::pixmap() const

{

    return d_func()->pixmap;

}

/*!

  \internal

*/

void QSplashScreenPrivate::drawContents()

{

    Q_Q(QSplashScreen);

    QPixmap textPix = pixmap;

    if (!textPix.isNull()) {

        QPainter painter(&textPix);

        painter.initFrom(q);

        q->drawContents(&painter);

        QPalette p = q->palette();

        p.setBrush(q->backgroundRole(), QBrush(textPix));

        q->setPalette(p);

    }

}

/*!

    \internal

*/

inline QSplashScreenPrivate::QSplashScreenPrivate() : currAlign(Qt::AlignLeft)

{

}

/*!

    Draw the contents of the splash screen using painter \a painter.

    The default implementation draws the message passed by showMessage().

    Reimplement this function if you want to do your own drawing on

    the splash screen.

*/

void QSplashScreen::drawContents(QPainter *painter)

{

    Q_D(QSplashScreen);

    painter->setPen(d->currColor);

    QRect r = rect();

    r.setRect(r.x() + 5, r.y() + 5, r.width() - 10, r.height() - 10);

    if (Qt::mightBeRichText(d->currStatus)) {

        QTextDocument doc;

#ifdef QT_NO_TEXTHTMLPARSER

        doc.setPlainText(d->currStatus);

#else

        doc.setHtml(d->currStatus);

#endif

        doc.setTextWidth(r.width());

        QTextCursor cursor(&doc);

        cursor.select(QTextCursor::Document);

        QTextBlockFormat fmt;

        fmt.setAlignment(Qt::Alignment(d->currAlign));

        cursor.mergeBlockFormat(fmt);

        painter->save();

        painter->translate(r.topLeft());

        doc.drawContents(painter);

        painter->restore();

    } else {

        painter->drawText(r, d->currAlign, d->currStatus);

    }

}

/*!

    \fn void QSplashScreen::message(const QString &message, int alignment,

                                    const QColor &color)

    \compat

    Use showMessage() instead.

*/

/*!

    \fn void QSplashScreen::clear()

    \compat

    Use clearMessage() instead.

*/

/*! \reimp */

bool QSplashScreen::event(QEvent *e)

{

    return QWidget::event(e);

}

QT_END_NAMESPACE

#endif //QT_NO_SPLASHSCREEN