Folgendes Programm knallt. Und ich hab keine Ahnung wieso. Erstmal den Code. Es ist nur ein Democode. Das ganze Framework wollte ich jetzt nicht posten.
Code: Alles auswählen
.pro
QT += core gui declarative
TARGET = Test4
TEMPLATE = app
SOURCES += main.cpp \
switcher.cpp
OTHER_FILES += \
qml1.qml \
qml2.qml
HEADERS += \
switcher.h
Code: Alles auswählen
switcher.h
#ifndef SWITCHER_H
#define SWITCHER_H
#include <QGraphicsScene>
#include <QtDeclarative>
#include <QGraphicsObject>
class QmlContainer : public QObject
{
Q_OBJECT
public:
QmlContainer(QString s,QDeclarativeEngine *engine);
~QmlContainer();
QGraphicsObject * retObj();
public slots:
void click();
signals:
void itemClicked();
private:
QDeclarativeEngine *m_engine;
QDeclarativeComponent *m_qmlComponent;
QGraphicsObject *obj;
QDeclarativeContext *m_qmlContext;
};
class Switcher : public QObject
{
Q_OBJECT
public:
Switcher(QGraphicsScene *scene,
QDeclarativeEngine *engine,
QObject *parent = 0);
~Switcher();
signals:
public slots:
void changeqml();
private:
QGraphicsScene *m_scene;
QDeclarativeEngine *m_engine;
QmlContainer *m_a;
QmlContainer *m_b;
QGraphicsObject *m_obj;
};
#endif // SWITCHER_H
Code: Alles auswählen
switcher.cpp
#include "switcher.h"
Switcher::Switcher(QGraphicsScene *scene,
QDeclarativeEngine *engine,
QObject *parent) :
QObject(parent)
{
m_scene = scene;
m_engine = engine;
m_a = new QmlContainer("qml1.qml", m_engine);
m_obj = m_a->retObj();
m_scene->addItem(qobject_cast <QGraphicsItem*> (m_obj));
connect(m_a, SIGNAL(itemClicked()), this, SLOT(changeqml()));
}
Switcher::~Switcher()
{}
void Switcher::changeqml()
{
qDebug("CHANGE");
m_scene->removeItem(qobject_cast <QGraphicsItem*> (m_obj));
m_b = new QmlContainer("qml2.qml", m_engine);
m_obj = m_b->retObj();
m_scene->addItem(qobject_cast <QGraphicsItem*> (m_obj));
delete m_a;
}
QmlContainer::QmlContainer(QString s, QDeclarativeEngine *engine)
: QObject(0)
{
m_engine = engine;
m_qmlContext = new QDeclarativeContext(m_engine->rootContext());
m_qmlContext->setContextProperty("qmlcontainer", this);
m_qmlComponent = new QDeclarativeComponent(m_engine,
QUrl(s),
this);
obj = qobject_cast<QGraphicsObject *>(m_qmlComponent->create(m_qmlContext));
}
QmlContainer::~QmlContainer()
{
delete obj;
delete m_qmlComponent;
}
QGraphicsObject * QmlContainer::retObj()
{
return obj;
}
void QmlContainer::click()
{
qDebug("Click");
emit itemClicked();
}
Code: Alles auswählen
main.cpp
#include <QApplication>
#include <QGraphicsView>
#include <QtDeclarative>
#include <QObject>
#include "switcher.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QDeclarativeEngine *engine = new QDeclarativeEngine;
QGraphicsScene *scene = new QGraphicsScene;
QGraphicsView view(scene);
view.resize(320,240);
view.show();
Switcher c(scene, engine);
return app.exec();
}
Code: Alles auswählen
qml1.qml
import Qt 4.7
Rectangle {
width: 320
height: 240
Text {
id: text1
x: 150
y: 114
width: 80
height: 20
text: "Text One"
}
MouseArea {
id: mouse_area1
x: 0
y: 0
width: 320
height: 240
onClicked: {
qmlcontainer.click();
}
}
}
Code: Alles auswählen
qml2.qml
import Qt 4.7
Rectangle {
width: 320
height: 240
color: "#ff0000"
}
SOOOO also.
QmlContainer wird normal gelöscht. Soweit so gut. "obj"(im Destruktor von QmlContainer) muss man scheinbar selber löschen, weil einem sonst der Speicher voll läuft. Wenn man allerdings "obj" auskommentiert dann stürzt das Programm nicht ab. Irgendwie verirrt er sich in irgendwelchen Mousehandler Methoden vom Declarative Module.
Ihr könnt ja mal das Programm ausprobieren.
LG Max