[SOLVED] Problems with changing text to QWidgets

xcoder

I can't figure out why I can't change the text for my button!

When I try to run my app it just returns: "file:///home/user/Desktop/Bizness/simple_gui/myqml.qml:30:14: Cannot assign to non-existent property "texts"
texts: "Right"
^ "

Here is my mypushbutton.h:
@#include <QtDeclarative/QDeclarativeExtensionPlugin>
#include <QtDeclarative/qdeclarative.h>
#include <QtGui/QGraphicsProxyWidget>
#include <QtGui/QPushButton>
#include <QDebug>

class MyPushButton : public QGraphicsProxyWidget
{
Q_OBJECT
Q_PROPERTY(QString texts READ texts WRITE setsText)

public:
MyPushButton(QGraphicsItem* parent = 0);

QString texts() const;
void setsText(const QString &texts;);

QString name() const;
void setName(const QString &name;);

private:
QPushButton *widget;
};
@

mypushbutton.cpp:
@#include "mypushbutton.h"
#include <QtGui/QPushButton>
#include <QDebug>

MyPushButton::MyPushButton(QGraphicsItem* parent)
: QGraphicsProxyWidget(parent)
{
widget = new QPushButton("MyPushButton");
widget->setAttribute(Qt::WA_NoSystemBackground);
setWidget(widget);

//QObject::connect(widget, SIGNAL(clicked(bool)), this, SIGNAL(clicked(bool)));

}

 QString MyPushButton::texts() const
 {
     return widget->text();
 }


 void MyPushButton::setsText(const QString &texts;)
 {
     if (texts != widget->text()) {
         widget->setText(texts);
         //emit textChanged();
     }
 }

@

main.cpp
@#include <QApplication>
#include "piechart.h"
#include "mypushbutton.h"
#include <qdeclarative.h>
#include <QDeclarativeView>
#include "simple_app.h"

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

qmlRegisterType<PieChart>("Charts", 1, 0, "PieChart");
qmlRegisterType<MyPushButton>("QWidget", 1, 0, "MyPushButton");

simple_app *dialog = new simple_app;

dialog->show();
return app.exec&#40;&#41;;

}
@

and part of my qml
@ MyPushButton {
id: button1
x: 100; y: 100
texts: "Right"
transformOriginPoint: Qt.point(width / 2, height / 2)

@

However, if I delete this line "texts: "right"" my app runs fine and shows the QWidget button!

mlong

The code you posted works for me (Assuming an import QWidget 1.0 at the head of the QML file.) What platform/version are you using?

xcoder

xubuntu 11.04 32bit, Qt Creator 2.2.1

And yes I've an "import QWidget 1.0" at the top of my QML file

Funny that I've successfully implanted "this example":http://doc.qt.nokia.com/4.7-snapshot/declarative-tutorials-extending-chapter2-methods.html

But I can't get to work with simple button.

Maybe I'll just install opensuse, because lately the new version of ubuntu has been giving my some headaches. I tried LTS, but I need newer apps than LTS has. And the new 11.04 version has a lot of glitches!

Best Regards
Raivis

mlong

Here's the code I ended up trying (starting with a Creator-generated QML project.)

main.cpp:
@
#include <QtGui/QApplication>
#include "qmlapplicationviewer.h"
#include "mypushbutton.h"
#include <qdeclarative.h>
#include <QDeclarativeView>

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

qmlRegisterType<MyPushButton>("QWidget", 1, 0, "MyPushButton");

QmlApplicationViewer viewer;
viewer.setMainQmlFile(QLatin1String("qml/test/main.qml"));
viewer.showExpanded();

return app.exec();
}
@

mypushbutton.h:
@
#ifndef MYPUSHBUTTON_H
#define MYPUSHBUTTON_H

#include <QtDeclarative/QDeclarativeExtensionPlugin>
#include <QtDeclarative/qdeclarative.h>
#include <QtGui/QGraphicsProxyWidget>
#include <QtGui/QPushButton>
#include <QDebug>

class MyPushButton : public QGraphicsProxyWidget
{
Q_OBJECT
Q_PROPERTY(QString texts READ texts WRITE setsText)

public:
MyPushButton(QGraphicsItem* parent = 0);

QString texts() const;
void setsText(const QString &amp;texts);

private:
QPushButton *widget;
};

#endif // MYPUSHBUTTON_H
@

mypushbutton.cpp:
@
#include "mypushbutton.h"

MyPushButton::MyPushButton(QGraphicsItem *parent) :
QGraphicsProxyWidget(parent)
{
widget = new QPushButton("MyPushButton");
widget->setAttribute(Qt::WA_NoSystemBackground);
setWidget(widget);

}

QString MyPushButton::texts() const
{
return widget->text();
}

void MyPushButton::setsText(const QString &texts)
{
if (texts != widget->text()) {
widget->setText(texts);
}
}
@

main.qml:
@
import QtQuick 1.0
import QWidget 1.0

Rectangle {
width: 360
height: 360

MyPushButton {
id: button1
x: 100; y: 100
texts: "Right"
transformOriginPoint: Qt.point(width / 2, height / 2)
}
}
@

You might give it a shot and see if that works for you. If so, it might give you a better starting point for debugging.

xcoder

Thanks your given code works, Now I'm going to try and figure out whats wrong with main!

mlong

Great! When you figure it out, let us know!

xcoder

Found the problem! A glitch in Qt Creator.
Both of the codes are practically identical!

I just changed the name of function, and suddenly my compiler returns this kind of error:
/home/user/Desktop/Bizness/simple_gui/mypushbutton.cpp:-1: error: undefined reference to `vtable for

Actually 11 of them, all "undefined refernece to 'vtable ......"

I just deleted all *.o files in my application directory. Rebuilt my project, and everything is OK. That is why the code you gave me worked for me, because I created new project, and so it generated new *.o files!

Thanks!

mlong

Probably rerunning qmake would have fixed things up. Glad to know it works now!

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