qrubberband.cpp

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// Copyright (C) 2016 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 "qbitmap.h"
#include "qevent.h"
#include "qstylepainter.h"
#include "qrubberband.h"
#include "qtimer.h"
 
#include "qstyle.h"
#include "qstyleoption.h"
 
#include <qdebug.h>
 
#include <private/qwidget_p.h>
 
QT_BEGIN_NAMESPACE
 
//### a rubberband window type would be a more elegant solution
#define RUBBERBAND_WINDOW_TYPE Qt::ToolTip
 
class QRubberBandPrivate : public QWidgetPrivate
{
    Q_DECLARE_PUBLIC(QRubberBand)
public:
    QRect rect;
    QRubberBand::Shape shape;
    QRegion clipping;
    void updateMask();
};
 
void QRubberBand::initStyleOption(QStyleOptionRubberBand *option) const
{
    if (!option)
        return;
    option->initFrom(this);
    option->shape = d_func()->shape;
#ifndef Q_OS_MAC
    option->opaque = true;
#else
    option->opaque = windowFlags() & RUBBERBAND_WINDOW_TYPE;
#endif
}
 
// ### DOC: How about some nice convenience constructors?
//QRubberBand::QRubberBand(QRubberBand::Type t, const QRect &rect, QWidget *p)
//QRubberBand::QRubberBand(QRubberBand::Type t, int x, int y, int w, int h, QWidget *p)
 
QRubberBand::QRubberBand(Shape s, QWidget *p)
    : QWidget(*new QRubberBandPrivate, p, (p && p->windowType() != Qt::Desktop) ? Qt::Widget : RUBBERBAND_WINDOW_TYPE)
{
    Q_D(QRubberBand);
    d->shape = s;
    setAttribute(Qt::WA_TransparentForMouseEvents);
    setAttribute(Qt::WA_NoSystemBackground);
    setAttribute(Qt::WA_WState_ExplicitShowHide);
    setVisible(false);
}
 
QRubberBand::~QRubberBand()
{
}
 
QRubberBand::Shape QRubberBand::shape() const
{
    Q_D(const QRubberBand);
    return d->shape;
}
 
void QRubberBandPrivate::updateMask()
{
    Q_Q(QRubberBand);
    QStyleHintReturnMask mask;
    QStyleOptionRubberBand opt;
    q->initStyleOption(&opt);
    if (q->style()->styleHint(QStyle::SH_RubberBand_Mask, &opt, q, &mask)) {
        q->setMask(mask.region);
    } else {
        q->clearMask();
    }
}
 
void QRubberBand::paintEvent(QPaintEvent *)
{
    QStylePainter painter(this);
    QStyleOptionRubberBand option;
    initStyleOption(&option);
    painter.drawControl(QStyle::CE_RubberBand, option);
}
 
void QRubberBand::changeEvent(QEvent *e)
{
    QWidget::changeEvent(e);
    switch (e->type()) {
    case QEvent::ParentChange:
        if (parent()) {
            setWindowFlags(windowFlags() & ~RUBBERBAND_WINDOW_TYPE);
        } else {
            setWindowFlags(windowFlags() | RUBBERBAND_WINDOW_TYPE);
        }
        break;
    default:
        break;
    }
 
    if (e->type() == QEvent::ZOrderChange)
        raise();
}
 
void QRubberBand::showEvent(QShowEvent *e)
{
    raise();
    e->ignore();
}
 
void QRubberBand::resizeEvent(QResizeEvent *)
{
    Q_D(QRubberBand);
    d->updateMask();
}
 
void QRubberBand::moveEvent(QMoveEvent *)
{
    Q_D(QRubberBand);
    d->updateMask();
}
 
void QRubberBand::setGeometry(const QRect &geom)
{
    QWidget::setGeometry(geom);
}
 
bool QRubberBand::event(QEvent *e)
{
    return QWidget::event(e);
}
 
QT_END_NAMESPACE
 
#include "moc_qrubberband.cpp"