qsplashscreen.cpp

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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qsplashscreen.h"
 
#include "qapplication.h"
#include "qpainter.h"
#include "qpixmap.h"
#include "qtextdocument.h"
#include "qtextcursor.h"
#include <QtGui/qscreen.h>
#include <QtGui/qwindow.h>
#include <QtCore/qdebug.h>
#include <QtCore/qelapsedtimer.h>
#include <private/qwidget_p.h>
 
#ifdef Q_OS_WIN
#  include <QtCore/qt_windows.h>
#else
#  include <time.h>
#endif
 
QT_BEGIN_NAMESPACE
 
class QSplashScreenPrivate : public QWidgetPrivate
{
    Q_DECLARE_PUBLIC(QSplashScreen)
public:
    QPixmap pixmap;
    QString currStatus;
    QColor currColor;
    int currAlign;
 
    inline QSplashScreenPrivate();
 
    void handlePaintEvent();
};
 
QSplashScreen::QSplashScreen(const QPixmap &pixmap, Qt::WindowFlags f)
    : QWidget(*(new QSplashScreenPrivate()), nullptr, Qt::SplashScreen | Qt::FramelessWindowHint | f)
{
    setPixmap(pixmap);  // Does an implicit repaint
}
 
QSplashScreen::QSplashScreen(QScreen *screen, const QPixmap &pixmap, Qt::WindowFlags f)
    : QWidget(*(new QSplashScreenPrivate()), nullptr, Qt::SplashScreen | Qt::FramelessWindowHint | f)
{
    Q_D(QSplashScreen);
    d->setScreen(screen);
    setPixmap(pixmap);
}
 
QSplashScreen::~QSplashScreen()
{
}
 
void QSplashScreen::mousePressEvent(QMouseEvent *)
{
    hide();
}
 
void QSplashScreen::repaint()
{
    QWidget::repaint();
    QCoreApplication::processEvents();
}
 
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();
}
 
QString QSplashScreen::message() const
{
    Q_D(const QSplashScreen);
    return d->currStatus;
}
 
void QSplashScreen::clearMessage()
{
    d_func()->currStatus.clear();
    emit messageChanged(d_func()->currStatus);
    repaint();
}
 
static bool waitForWidgetMapped(QWidget *widget, int timeout = 1000)
{
    enum { TimeOutMs = 10 };
    auto isMapped = [widget](){
        return widget->windowHandle() && widget->windowHandle()->isVisible();
    };
 
    QElapsedTimer timer;
    timer.start();
    while (!isMapped()) {
        const int remaining = timeout - int(timer.elapsed());
        if (remaining <= 0)
            break;
        QCoreApplication::processEvents(QEventLoop::AllEvents, remaining);
        QCoreApplication::sendPostedEvents();
#if defined(Q_OS_WIN)
        Sleep(uint(TimeOutMs));
#else
        struct timespec ts = { TimeOutMs / 1000, (TimeOutMs % 1000) * 1000 * 1000 };
        nanosleep(&ts, nullptr);
#endif
    }
    return isMapped();
}
 
void QSplashScreen::finish(QWidget *mainWin)
{
    if (mainWin) {
        if (!mainWin->windowHandle())
            mainWin->createWinId();
        waitForWidgetMapped(mainWin);
    }
    close();
}
 
void QSplashScreen::setPixmap(const QPixmap &pixmap)
{
    Q_D(QSplashScreen);
    d->pixmap = pixmap;
    setAttribute(Qt::WA_TranslucentBackground, pixmap.hasAlpha());
 
    const QRect r(QPoint(), pixmap.deviceIndependentSize().toSize());
    resize(r.size());
 
    move(screen()->geometry().center() - r.center());
    if (isVisible())
        repaint();
}
 
const QPixmap QSplashScreen::pixmap() const
{
    return d_func()->pixmap;
}
 
inline QSplashScreenPrivate::QSplashScreenPrivate() : currAlign(Qt::AlignLeft)
{
}
 
void QSplashScreen::drawContents(QPainter *painter)
{
    Q_D(QSplashScreen);
    painter->setPen(d->currColor);
    QRect r = rect().adjusted(5, 5, -5, -5);
    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));
        fmt.setLayoutDirection(layoutDirection());
        cursor.mergeBlockFormat(fmt);
        const QSizeF txtSize = doc.size();
        if (d->currAlign & Qt::AlignBottom)
            r.setTop(r.height() - txtSize.height());
        else if (d->currAlign & Qt::AlignVCenter)
            r.setTop(r.height() / 2 - txtSize.height() / 2);
        painter->save();
        painter->translate(r.topLeft());
        doc.drawContents(painter);
        painter->restore();
    } else {
        painter->drawText(r, d->currAlign, d->currStatus);
    }
}
 
void QSplashScreenPrivate::handlePaintEvent()
{
    Q_Q(QSplashScreen);
    QPainter painter(q);
    painter.setRenderHints(QPainter::SmoothPixmapTransform);
    painter.setLayoutDirection(q->layoutDirection());
    if (!pixmap.isNull())
        painter.drawPixmap(QPoint(), pixmap);
    q->drawContents(&painter);
}
 
bool QSplashScreen::event(QEvent *e)
{
    Q_D(QSplashScreen);
 
    switch (e->type()) {
    case QEvent::Paint:
        d->handlePaintEvent();
        break;
    case QEvent::Show:
        waitForWidgetMapped(this);
        break;
    default:
        break;
    }
 
    return QWidget::event(e);
}
 
QT_END_NAMESPACE
 
#include "moc_qsplashscreen.cpp"