qgraphicsview.cpp File Reference

#include "qgraphicsview.h"
#include "qgraphicsview_p.h"
#include "qgraphicsitem.h"
#include "qgraphicsitem_p.h"
#include "qgraphicsscene.h"
#include "qgraphicsscene_p.h"
#include "qgraphicssceneevent.h"
#include "qgraphicswidget.h"
#include <QtCore/qdatetime.h>
#include <QtCore/qdebug.h>
#include <QtCore/qmath.h>
#include <QtGui/qapplication.h>
#include <QtGui/qdesktopwidget.h>
#include <QtGui/qevent.h>
#include <QtGui/qlayout.h>
#include <QtGui/qtransform.h>
#include <QtGui/qmatrix.h>
#include <QtGui/qpainter.h>
#include <QtGui/qscrollbar.h>
#include <QtGui/qstyleoption.h>
#include <QtGui/qinputcontext.h>
#include <QtGui/qpaintengine.h>
#include <private/qt_x11_p.h>
#include <private/qevent_p.h>
#include "moc_qgraphicsview.cpp"

Go to the source code of this file.

Functions
static bool	containsViewport (const QRect &r, int width, int height)
static bool	intersectsViewport (const QRect &r, int width, int height)
int	q_round_bound (qreal d)
static void	QRect_unite (QRect *rect, const QRect &other)
Q_AUTOTEST_EXPORT QPainterPath	qt_regionToPath (const QRegion &region)
bool	qt_sendSpontaneousEvent (QObject *receiver, QEvent *event)

Variables
static const int	QGRAPHICSVIEW_PREALLOC_STYLE_OPTIONS = 503
static const int	QGRAPHICSVIEW_REGION_RECT_THRESHOLD = 50

Function Documentation

containsViewport()

static bool containsViewport ( const QRect &  r, int  width, int  height  )

inlinestatic

Definition at line 894 of file qgraphicsview.cpp.

Referenced by QGraphicsViewPrivate::updateRect().

{ return r.left() <= 0 && r.top() <= 0 && r.right() >= width - 1 && r.bottom() >= height - 1; }

intersectsViewport()

static bool intersectsViewport ( const QRect &  r, int  width, int  height  )

inlinestatic

Definition at line 891 of file qgraphicsview.cpp.

Referenced by QGraphicsViewPrivate::updateRect(), and QGraphicsViewPrivate::updateRegion().

{ return !(r.left() > width) && !(r.right() < 0) && !(r.top() >= height) && !(r.bottom() < 0); }

q_round_bound()

int q_round_bound ( qreal  d )

inline

Definition at line 313 of file qgraphicsview.cpp.

Referenced by QGraphicsViewPrivate::recalculateContentSize().

{
    if (d <= (qreal) INT_MIN)
        return INT_MIN;
    else if (d >= (qreal) INT_MAX)
        return INT_MAX;
    return d >= 0.0 ? int(d + qreal(0.5)) : int(d - int(d-1) + qreal(0.5)) + int(d-1);
}

QRect_unite()

static void QRect_unite ( QRect *  rect, const QRect &  other  )

inlinestatic

Definition at line 897 of file qgraphicsview.cpp.

Referenced by QGraphicsViewPrivate::updateRect().

{
    if (rect->isEmpty()) {
        *rect = other;
    } else {
        rect->setCoords(qMin(rect->left(), other.left()), qMin(rect->top(), other.top()),
                        qMax(rect->right(), other.right()), qMax(rect->bottom(), other.bottom()));
    }
}

qt_regionToPath()

Q_AUTOTEST_EXPORT QPainterPath qt_regionToPath

(

const QRegion &

region

)

Definition at line 1160 of file qregion.cpp.

Referenced by QGraphicsViewPrivate::findItems(), and QGraphicsViewPrivate::freeStyleOptionsArray().

{
    QPainterPath result;
    if (region.rectCount() == 1) {
        result.addRect(region.boundingRect());
        return result;
    }

    const QVector<QRect> rects = region.rects();

    QVarLengthArray<Segment> segments;
    segments.resize(4 * rects.size());

    const QRect *rect = rects.constData();
    const QRect *end = rect + rects.size();

    int lastRowSegmentCount = 0;
    Segment *lastRowSegments = 0;

    int lastSegment = 0;
    int lastY = 0;
    while (rect != end) {
        const int y = rect[0].y();
        int count = 0;
        while (&rect[count] != end && rect[count].y() == y)
            ++count;

        for (int i = 0; i < count; ++i) {
            int offset = lastSegment + i;
            segments[offset] = Segment(rect[i].topLeft());
            segments[offset += count] = Segment(rect[i].topRight() + QPoint(1, 0));
            segments[offset += count] = Segment(rect[i].bottomRight() + QPoint(1, 1));
            segments[offset += count] = Segment(rect[i].bottomLeft() + QPoint(0, 1));

            offset = lastSegment + i;
            for (int j = 0; j < 4; ++j)
                segments[offset + j * count].connect(segments[offset + ((j + 1) % 4) * count]);
        }

        if (lastRowSegments && lastY == y)
            mergeSegments(lastRowSegments, lastRowSegmentCount, &segments[lastSegment], count);

        lastRowSegments = &segments[lastSegment + 2 * count];
        lastRowSegmentCount = count;
        lastSegment += 4 * count;
        lastY = y + rect[0].height();
        rect += count;
    }

    for (int i = 0; i < lastSegment; ++i) {
        Segment *segment = &segments[i];
        if (!segment->added)
            addSegmentsToPath(segment, result);
    }

    return result;
}

qt_sendSpontaneousEvent()

bool qt_sendSpontaneousEvent	(	QObject *	receiver,
		QEvent *	event
	)

Definition at line 5779 of file qapplication.cpp.

Referenced by QGraphicsView::mouseDoubleClickEvent(), QGraphicsViewPrivate::mouseMoveEventHandler(), QGraphicsView::mousePressEvent(), and QGraphicsView::mouseReleaseEvent().

{
    return QCoreApplication::sendSpontaneousEvent(receiver, event);
}

Variable Documentation

QGRAPHICSVIEW_PREALLOC_STYLE_OPTIONS

const int QGRAPHICSVIEW_PREALLOC_STYLE_OPTIONS = 503

static

Definition at line 44 of file qgraphicsview.cpp.

Referenced by QGraphicsViewPrivate::QGraphicsViewPrivate().

QGRAPHICSVIEW_REGION_RECT_THRESHOLD

const int QGRAPHICSVIEW_REGION_RECT_THRESHOLD = 50

static

Definition at line 42 of file qgraphicsview.cpp.

Referenced by QGraphicsView::updateScene().