QWidget
's 、、、width()
または関数にheight()
問題があります。呼び出されると、セグメンテーション違反が発生します。Qt4.7です。size()
rect()
問題のあるクラスのヘッダーは次のとおりです。
class PlotCanvas : public QWidget
{
void paintEvent(QPaintEvent * e);
uint64_t smallestDiv();
uint64_t longestLength();
void drawGrid(QPainter * painter);
QVector<Plot*> plots;
int calculateHeight() const;
int calculateWidth() const;
uint32_t cursorPosition;
public:
PlotCanvas(QWidget * parent = 0) : QWidget(parent)
{
setStyleSheet("background-color: black");
setAutoFillBackground(true);
setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
setFocusPolicy(Qt::StrongFocus);
update();
}
void addPlot(Plot * plot);
int getDivCount();
};
および実際のsegfaultingコード:
int PlotCanvas::getDivCount()
{
QRect bounds = rect(); //segfaults
qDebug() << bounds.size().width();
qDebug() << bounds.size().height();
return 10;
}
Qtにトレースqrect.h
:
inline int QRect::width() const
{ return x2 - x1 + 1; } //this line finally kills it
内部に正しく初期化されていQWidget
ないものがあるようですが、ご覧のとおり、初期化をそれほど変更していないので、何がわかりませんQWidget
。
PlotCanvas
ウィジェットはのサブクラスに存在しますQAbstractScrollArea
(まだ実装されていないため、単純QAbstractScrollArea
です:
class PlotCanvasScrollArea : public QAbstractScrollArea
{
public:
PlotCanvasScrollArea(QWidget * parent = 0) : QAbstractScrollArea(parent)
{
}
};
遷移図でプロットしているので、ペイント領域のサイズを決定する必要がQWidget
あります。明らかにアプリケーションウィンドウのサイズが変更可能であるため、現在のウィジェットサイズにいくつの時間分割が収まるかを知る必要があります。
編集:
PlotCanvas
構築さ れるコード:
Board(QString & name) : name(name)
{
hbox = new QHBoxLayout();
commonKnobGroup = new QGroupBox("Common settings:");
commonKnobGroup->setMinimumWidth(190);
commonKnobGroup->setSizePolicy(QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum));
commonKnobs = new CommonKnobs(commonKnobGroup);
hsplitter = new QSplitter();
plotGroupBox = new QGroupBox("Measurement plots:", hsplitter);
settingsGroupBox = new QGroupBox("Plot settings:", hsplitter);
plotSplitter = new QSplitter();
plotHbox = new QHBoxLayout();
plotHbox->addWidget(plotSplitter);
plotGroupBox->setLayout(plotHbox);
settingsVLayout = new QVBoxLayout();
plotNamesColumn = new QListWidget(plotSplitter);
scrollArea = new PlotCanvasScrollArea(plotSplitter);
//scrollArea->setWidgetResizable(true);
plotsCanvas = new PlotCanvas();
scrollArea->setViewport(plotsCanvas);
scrollArea->setBackgroundRole(QPalette::Dark);
specializedKnobGroup = new QGroupBox("Probe settings:");
plotSettings = new QStackedWidget(specializedKnobGroup);
settingsVLayout->addWidget(commonKnobGroup);
settingsVLayout->addWidget(specializedKnobGroup);
settingsGroupBox->setLayout(settingsVLayout);
hbox->addWidget(hsplitter);
setLayout(hbox);
connect(plotNamesColumn, SIGNAL(currentItemChanged(QListWidgetItem *, QListWidgetItem *)), this,
SLOT(changePageNames(QListWidgetItem*, QListWidgetItem*)));
connect(commonKnobs, SIGNAL(scaleUpdated()), plotsCanvas, SLOT(update()));
};
EDIT2 :
完全なスタックトレース:
#0 0x000000010000b9ac in QWidget::rect() const at /Volumes/Data/shinji/QtSDK/Desktop/Qt/474/gcc/include/QtGui/qwidget.h:1007
#1 0x000000010000b454 in PlotCanvas::getDivCount() ()
#2 0x000000010000ab39 in Board::getDivCount() ()
#3 0x0000000100009fbc in CommonKnobs::updateScaleByBeginEnd() ()
#4 0x00000001000015b4 in CommonKnobs::qt_metacall(QMetaObject::Call, int, void**) ()
#5 0x0000000100d09b66 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) ()
#6 0x000000010070df9d in QSpinBox::valueChanged(int) ()
#7 0x00000001004d9684 in QSpinBoxPrivate::emitSignals(EmitPolicy, QVariant const&) ()
#8 0x000000010043b321 in QAbstractSpinBoxPrivate::setValue(QVariant const&, EmitPolicy, bool) ()
#9 0x000000010043c11a in QAbstractSpinBoxPrivate::_q_editorTextChanged(QString const&) ()
#10 0x000000010043cca7 in QAbstractSpinBox::qt_metacall(QMetaObject::Call, int, void**) ()
#11 0x000000010070e435 in QSpinBox::qt_metacall(QMetaObject::Call, int, void**) ()
#12 0x0000000100d09b66 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) ()
#13 0x000000010048a1e6 in QLineEdit::textChanged(QString const&) ()
#14 0x000000010048d23a in QLineEdit::qt_metacall(QMetaObject::Call, int, void**) ()
#15 0x0000000100d09b66 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) ()
#16 0x000000010070c9f9 in QLineControl::textChanged(QString const&) ()
#17 0x0000000100494337 in QLineControl::finishChange(int, bool, bool) ()
#18 0x0000000100496664 in QLineControl::processKeyEvent(QKeyEvent*) ()
#19 0x000000010048b8eb in QLineEdit::keyPressEvent(QKeyEvent*) ()
#20 0x00000001001056bd in QWidget::event(QEvent*) ()
#21 0x000000010048c18b in QLineEdit::event(QEvent*) ()
#22 0x000000010043d9f0 in QAbstractSpinBox::keyPressEvent(QKeyEvent*) ()
#23 0x00000001001056bd in QWidget::event(QEvent*) ()
#24 0x000000010043bb1b in QAbstractSpinBox::event(QEvent*) ()
#25 0x00000001004d7be5 in QSpinBox::event(QEvent*) ()
#26 0x00000001000a9e8d in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
#27 0x00000001000b198b in QApplication::notify(QObject*, QEvent*) ()
#28 0x0000000100d0321c in QCoreApplication::notifyInternal(QObject*, QEvent*) ()
#29 0x00000001000a9f2c in qt_sendSpontaneousEvent(QObject*, QEvent*) ()
#30 0x0000000100125cc1 in QKeyMapper::sendKeyEvent(QWidget*, bool, QEvent::Type, int, QFlags<Qt::KeyboardModifier>, QString const&, bool, int, unsigned int, unsigned int, unsigned int, bool*) ()
#31 0x0000000100126b43 in QKeyMapperPrivate::translateKeyEvent(QWidget*, OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*, bool) ()
#32 0x000000010006072e in qt_dispatchKeyEvent(void*, QWidget*) ()
#33 0x000000010005478b in -[QCocoaView keyDown:] ()
#34 0x00007fff815a90c7 in -[NSWindow sendEvent:] ()
#35 0x0000000100059891 in -[QCocoaWindow sendEvent:] ()
#36 0x00007fff814ddafa in -[NSApplication sendEvent:] ()
#37 0x000000010005cf0a in -[QNSApplication sendEvent:] ()
#38 0x00007fff814746de in -[NSApplication run] ()
#39 0x0000000100066c04 in QEventDispatcherMac::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
#40 0x0000000100def774 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
#41 0x0000000100defa94 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
#42 0x0000000100df10bc in QCoreApplication::exec() ()
#43 0x0000000100001cf6 in main ()