qquickstyle.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 "qquickstyle.h"
#include "qquickstyle_p.h"
#include "qquickstyleoption.h"
 
#include <QtGui/qpainter.h>
#include <QtGui/qbitmap.h>
#include <QtGui/qpixmapcache.h>
#include <QtGui/qpa/qplatformtheme.h>
 
#include <QtGui/private/qguiapplication_p.h>
 
#ifndef QT_NO_DEBUG
#    include <QtCore/qdebug.h>
#endif
 
#include <limits.h>
#include <algorithm>
 
QT_BEGIN_NAMESPACE
 
namespace QQC2 {
 
QStyle::QStyle()
    : QObject(*new QStylePrivate)
{
    Q_D(QStyle);
    d->proxyStyle = this;
}
 
QStyle::QStyle(QStylePrivate &dd)
    : QObject(dd)
{
    Q_D(QStyle);
    d->proxyStyle = this;
}
 
QStyle::~QStyle()
{
}
 
QRect QStyle::itemTextRect(const QFontMetrics &metrics, const QRect &rect, int alignment, bool enabled,
                       const QString &text) const
{
    QRect result;
    int x, y, w, h;
    rect.getRect(&x, &y, &w, &h);
    if (!text.isEmpty()) {
        result = metrics.boundingRect(x, y, w, h, alignment, text);
        if (!enabled && proxy()->styleHint(SH_EtchDisabledText)) {
            result.setWidth(result.width()+1);
            result.setHeight(result.height()+1);
        }
    } else {
        result = QRect(x, y, w, h);
    }
    return result;
}
 
QRect QStyle::itemPixmapRect(const QRect &rect, int alignment, const QPixmap &pixmap) const
{
    QRect result;
    int x, y, w, h;
    rect.getRect(&x, &y, &w, &h);
 
    const int pixmapWidth = pixmap.width()/pixmap.devicePixelRatio();
    const int pixmapHeight = pixmap.height()/pixmap.devicePixelRatio();
 
    if ((alignment & Qt::AlignVCenter) == Qt::AlignVCenter)
        y += h/2 - pixmapHeight/2;
    else if ((alignment & Qt::AlignBottom) == Qt::AlignBottom)
        y += h - pixmapHeight;
    if ((alignment & Qt::AlignRight) == Qt::AlignRight)
        x += w - pixmapWidth;
    else if ((alignment & Qt::AlignHCenter) == Qt::AlignHCenter)
        x += w/2 - pixmapWidth/2;
    else if ((alignment & Qt::AlignLeft) != Qt::AlignLeft && QGuiApplication::isRightToLeft())
        x += w - pixmapWidth;
    result = QRect(x, y, pixmapWidth, pixmapHeight);
    return result;
}
 
void QStyle::drawItemText(QPainter *painter, const QRect &rect, int alignment, const QPalette &pal,
                          bool enabled, const QString& text, QPalette::ColorRole textRole) const
{
    if (text.isEmpty())
        return;
    QPen savedPen;
    if (textRole != QPalette::NoRole) {
        savedPen = painter->pen();
        painter->setPen(QPen(pal.brush(textRole), savedPen.widthF()));
    }
    if (!enabled) {
        if (proxy()->styleHint(SH_DitherDisabledText)) {
            QRect br;
            painter->drawText(rect, alignment, text, &br);
            painter->fillRect(br, QBrush(painter->background().color(), Qt::Dense5Pattern));
            return;
        } else if (proxy()->styleHint(SH_EtchDisabledText)) {
            QPen pen = painter->pen();
            painter->setPen(pal.light().color());
            painter->drawText(rect.adjusted(1, 1, 1, 1), alignment, text);
            painter->setPen(pen);
        }
    }
    painter->drawText(rect, alignment, text);
    if (textRole != QPalette::NoRole)
        painter->setPen(savedPen);
}
 
void QStyle::drawItemPixmap(QPainter *painter, const QRect &rect, int alignment,
                            const QPixmap &pixmap) const
{
    qreal scale = pixmap.devicePixelRatio();
    QRect aligned = alignedRect(QGuiApplication::layoutDirection(), QFlag(alignment), pixmap.size() / scale, rect);
    QRect inter = aligned.intersected(rect);
 
    painter->drawPixmap(inter.x(), inter.y(), pixmap, inter.x() - aligned.x(), inter.y() - aligned.y(), inter.width() * scale, inter.height() *scale);
}
 
QRect QStyle::visualRect(Qt::LayoutDirection direction, const QRect &boundingRect, const QRect &logicalRect)
{
    if (direction == Qt::LeftToRight)
        return logicalRect;
    QRect rect = logicalRect;
    rect.translate(2 * (boundingRect.right() - logicalRect.right()) +
                   logicalRect.width() - boundingRect.width(), 0);
    return rect;
}
 
QPoint QStyle::visualPos(Qt::LayoutDirection direction, const QRect &boundingRect, const QPoint &logicalPos)
{
    if (direction == Qt::LeftToRight)
        return logicalPos;
    return QPoint(boundingRect.right() - logicalPos.x(), logicalPos.y());
}
 
QRect QStyle::alignedRect(Qt::LayoutDirection direction, Qt::Alignment alignment, const QSize &size, const QRect &rectangle)
{
    alignment = visualAlignment(direction, alignment);
    int x = rectangle.x();
    int y = rectangle.y();
    int w = size.width();
    int h = size.height();
    if ((alignment & Qt::AlignVCenter) == Qt::AlignVCenter)
        y += rectangle.size().height()/2 - h/2;
    else if ((alignment & Qt::AlignBottom) == Qt::AlignBottom)
        y += rectangle.size().height() - h;
    if ((alignment & Qt::AlignRight) == Qt::AlignRight)
        x += rectangle.size().width() - w;
    else if ((alignment & Qt::AlignHCenter) == Qt::AlignHCenter)
        x += rectangle.size().width()/2 - w/2;
    return QRect(x, y, w, h);
}
 
Qt::Alignment QStyle::visualAlignment(Qt::LayoutDirection direction, Qt::Alignment alignment)
{
    return QGuiApplicationPrivate::visualAlignment(direction, alignment);
}
 
int QStyle::sliderPositionFromValue(int min, int max, int logicalValue, int span, bool upsideDown)
{
    if (span <= 0 || logicalValue < min || max <= min)
        return 0;
    if (logicalValue > max)
        return upsideDown ? span : min;
 
    uint range = max - min;
    uint p = upsideDown ? max - logicalValue : logicalValue - min;
 
    if (range > (uint)INT_MAX/4096) {
        double dpos = (double(p))/(double(range)/span);
        return int(dpos);
    } else if (range > (uint)span) {
        return (2 * p * span + range) / (2*range);
    } else {
        uint div = span / range;
        uint mod = span % range;
        return p * div + (2 * p * mod + range) / (2 * range);
    }
    // equiv. to (p * span) / range + 0.5
    // no overflow because of this implicit assumption:
    // span <= 4096
}
 
int QStyle::sliderValueFromPosition(int min, int max, int pos, int span, bool upsideDown)
{
    if (span <= 0 || pos <= 0)
        return upsideDown ? max : min;
    if (pos >= span)
        return upsideDown ? min : max;
 
    uint range = max - min;
 
    if ((uint)span > range) {
        int tmp = (2 * pos * range + span) / (2 * span);
        return upsideDown ? max - tmp : tmp + min;
    } else {
        uint div = range / span;
        uint mod = range % span;
        int tmp = pos * div + (2 * pos * mod + span) / (2 * span);
        return upsideDown ? max - tmp : tmp + min;
    }
    // equiv. to min + (pos*range)/span + 0.5
    // no overflow because of this implicit assumption:
    // pos <= span < sqrt(INT_MAX+0.0625)+0.25 ~ sqrt(INT_MAX)
}
 
QPalette QStyle::standardPalette() const
{
    QColor background = QColor(0xd4, 0xd0, 0xc8); // win 2000 grey
 
    QColor light(background.lighter());
    QColor dark(background.darker());
    QColor mid(Qt::gray);
    QPalette palette(Qt::black, background, light, dark, mid, Qt::black, Qt::white);
    palette.setBrush(QPalette::Disabled, QPalette::WindowText, dark);
    palette.setBrush(QPalette::Disabled, QPalette::Text, dark);
    palette.setBrush(QPalette::Disabled, QPalette::ButtonText, dark);
    palette.setBrush(QPalette::Disabled, QPalette::Base, background);
    return palette;
}
 
//Windows and KDE allow menus to cover the taskbar, while GNOME and macOS don't
bool QStylePrivate::useFullScreenForPopup()
{
    auto theme = QGuiApplicationPrivate::platformTheme();
    return theme && theme->themeHint(QPlatformTheme::UseFullScreenForPopupMenu).toBool();
}
 
} // namespace QQC2
 
QT_END_NAMESPACE
 
#include "moc_qquickstyle.cpp"