qrubberband.cpp

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#include "qbitmap.h"
#include "qevent.h"
#include "qstylepainter.h"
#include "qrubberband.h"
#include "qtimer.h"

#ifndef QT_NO_RUBBERBAND

#include "qstyle.h"
#include "qstyleoption.h"
#ifdef Q_WS_MAC
#  include <private/qt_mac_p.h>
#  include <private/qt_cocoa_helpers_mac_p.h>
#endif

#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_WS_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);
#ifndef Q_WS_WIN
    setAttribute(Qt::WA_NoSystemBackground);
#endif //Q_WS_WIN
    setAttribute(Qt::WA_WState_ExplicitShowHide);
    setVisible(false);
#ifdef Q_WS_MAC
    if (isWindow()) {
        createWinId();
        extern OSWindowRef qt_mac_window_for(const QWidget *); //qwidget_mac.cpp
        macWindowSetHasShadow(qt_mac_window_for(this), false);
    }
#endif
}

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

#endif // QT_NO_RUBBERBAND