Custom Widget :A class extending a Qwidget, I dont see anything...

I want to have a custom widget extending, for example, a Qtreeview.
I dont want to reimplement paintevent, simply have some more functions.
Ok, I dont see anything when put my custom widget plugin on my form.
What is happen ?
Thanks

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAHHHHHHHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!

How often do we have to tell, that we can not answer questions like

Quote:

---

Originally Posted by tonnot

What is happen ?

---

if you don't show us any line of code or describe that function do you have added and how.

Ok, if you want here is the code, simply a skeleton.

Code:

---

#ifndef A_TABLE_H
#define A_TABLE_H
#include <QtGui/QTreeView>
#include <QObject>
class A_table : public QTreeView
{
    Q_OBJECT
 
public:
    A_table(QWidget *parent=0);
};
#endif // A_TABLE_H

---

Code:

---

#include "a_table.h"
A_table::A_table(QWidget *parent) : QTreeView()
{ }

---

Then, I choose a Qwidget, and promote to A_table.
When run the prog. I dont see nothing. A least, I have to see an empty white widget, isn't ?
Thanks

What does the constructor generated by uic for your program look like?

Nothing , a transparent Widget. ....

However, I have another Qwidget that has paintevent and this one is viewed ok when run the prog.
So, I dont know If I must to override paintevent?
I only want, by the moment, to have a Qwidget that extends a Qt widget.
Thanks

You have an empty widget because promotion doesn't incorporate your custom widget into Designer/Creator. To do that, you have to implement the correct plugin interface so the tool knows how to display your custom widget.

The empty widget provided by the promotion facility simply serves as a layout aid. When you preview or build, it will be replaced by an instance of your widget.

have you tested your class in plain C++ instead of promoting and using the ui?

1.- I have tested the class in 'old' style (creating the instance, givin size, etc) and It is showed. ( an empty white QTreeView)
2.- If I extend the A_table to Qpushbutton.... promote works fine, I see an empty space at my form, but I see a button when run. (so, it is ok).
So, finally, I cannot extend a basic QTreeView using promote ?

Quote:

---

Originally Posted by tonnot

Nothing , a transparent Widget. ....

---

This is not an answer to my question. Again, please post code generated by uic for a form containing your promoted class.

Here you are:

Code:

---

#ifndef UI_MAINWINDOW_H
#define UI_MAINWINDOW_H
 
#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QHeaderView>
#include <QtGui/QLabel>
#include <QtGui/QLineEdit>
#include <QtGui/QMainWindow>
#include <QtGui/QMenuBar>
#include <QtGui/QPushButton>
#include <QtGui/QStatusBar>
#include <QtGui/QToolBar>
#include <QtGui/QTreeView>
#include <QtGui/QWidget>
#include <a_table.h>
 
QT_BEGIN_NAMESPACE
 
class Ui_MainWindow
{
public:
    QWidget *centralWidget;
    QPushButton *pushButton;
    QLabel *label;
    QLabel *label_2;
    QPushButton *pushButton_2;
    QPushButton *pushButton_3;
    QLineEdit *lineEdit;
    QPushButton *pushButton_4;
    QPushButton *pushButton_5;
    QLabel *label_tiempo;
    QPushButton *pushButton_6;
    QTreeView *treeView;
    A_table *widget;
    QMenuBar *menuBar;
    QToolBar *mainToolBar;
    QStatusBar *statusBar;
 
    void setupUi(QMainWindow *MainWindow)
    {
        if (MainWindow->objectName().isEmpty())
            MainWindow->setObjectName(QString::fromUtf8("MainWindow"));
        MainWindow->resize(568, 676);
        centralWidget = new QWidget(MainWindow);
        centralWidget->setObjectName(QString::fromUtf8("centralWidget"));
        pushButton = new QPushButton(centralWidget);
        pushButton->setObjectName(QString::fromUtf8("pushButton"));
        pushButton->setGeometry(QRect(264, 24, 75, 23));
        label = new QLabel(centralWidget);
        label->setObjectName(QString::fromUtf8("label"));
        label->setGeometry(QRect(36, 12, 46, 13));
        label_2 = new QLabel(centralWidget);
        label_2->setObjectName(QString::fromUtf8("label_2"));
        label_2->setGeometry(QRect(204, 132, 46, 13));
        pushButton_2 = new QPushButton(centralWidget);
        pushButton_2->setObjectName(QString::fromUtf8("pushButton_2"));
        pushButton_2->setGeometry(QRect(400, 120, 75, 23));
        pushButton_3 = new QPushButton(centralWidget);
        pushButton_3->setObjectName(QString::fromUtf8("pushButton_3"));
        pushButton_3->setGeometry(QRect(140, 160, 75, 23));
        lineEdit = new QLineEdit(centralWidget);
        lineEdit->setObjectName(QString::fromUtf8("lineEdit"));
        lineEdit->setGeometry(QRect(20, 160, 113, 20));
        pushButton_4 = new QPushButton(centralWidget);
        pushButton_4->setObjectName(QString::fromUtf8("pushButton_4"));
        pushButton_4->setGeometry(QRect(480, 180, 75, 23));
        pushButton_5 = new QPushButton(centralWidget);
        pushButton_5->setObjectName(QString::fromUtf8("pushButton_5"));
        pushButton_5->setGeometry(QRect(20, 200, 75, 23));
        label_tiempo = new QLabel(centralWidget);
        label_tiempo->setObjectName(QString::fromUtf8("label_tiempo"));
        label_tiempo->setGeometry(QRect(340, 120, 46, 13));
        pushButton_6 = new QPushButton(centralWidget);
        pushButton_6->setObjectName(QString::fromUtf8("pushButton_6"));
        pushButton_6->setGeometry(QRect(20, 280, 75, 23));
        treeView = new QTreeView(centralWidget);
        treeView->setObjectName(QString::fromUtf8("treeView"));
        treeView->setGeometry(QRect(120, 211, 401, 161));
        treeView->setAlternatingRowColors(true);
        widget = new A_table(centralWidget);
        widget->setObjectName(QString::fromUtf8("widget"));
        widget->setGeometry(QRect(120, 400, 261, 141));
        MainWindow->setCentralWidget(centralWidget);
        menuBar = new QMenuBar(MainWindow);
        menuBar->setObjectName(QString::fromUtf8("menuBar"));
        menuBar->setGeometry(QRect(0, 0, 568, 20));
        MainWindow->setMenuBar(menuBar);
        mainToolBar = new QToolBar(MainWindow);
        mainToolBar->setObjectName(QString::fromUtf8("mainToolBar"));
        MainWindow->addToolBar(Qt::TopToolBarArea, mainToolBar);
        statusBar = new QStatusBar(MainWindow);
        statusBar->setObjectName(QString::fromUtf8("statusBar"));
        MainWindow->setStatusBar(statusBar);
 
        retranslateUi(MainWindow);
 
        QMetaObject::connectSlotsByName(MainWindow);
    } // setupUi
 
    void retranslateUi(QMainWindow *MainWindow)
    {
        MainWindow->setWindowTitle(QApplication::translate("MainWindow", "MainWindow", 0, QApplication::UnicodeUTF8));
        pushButton->setText(QApplication::translate("MainWindow", "PushButton", 0, QApplication::UnicodeUTF8));
        label->setText(QApplication::translate("MainWindow", "TextLabel", 0, QApplication::UnicodeUTF8));
        label_2->setText(QApplication::translate("MainWindow", "TextLabel", 0, QApplication::UnicodeUTF8));
        pushButton_2->setText(QApplication::translate("MainWindow", "abre fichero", 0, QApplication::UnicodeUTF8));
        pushButton_3->setText(QApplication::translate("MainWindow", "buffer", 0, QApplication::UnicodeUTF8));
        pushButton_4->setText(QApplication::translate("MainWindow", "bool", 0, QApplication::UnicodeUTF8));
        pushButton_5->setText(QApplication::translate("MainWindow", "buffer", 0, QApplication::UnicodeUTF8));
        label_tiempo->setText(QApplication::translate("MainWindow", "TextLabel", 0, QApplication::UnicodeUTF8));
        pushButton_6->setText(QApplication::translate("MainWindow", "memory", 0, QApplication::UnicodeUTF8));
    } // retranslateUi
 
};
 
namespace Ui {
    class MainWindow: public Ui_MainWindow {};
} // namespace Ui
 
QT_END_NAMESPACE
 
#endif // UI_MAINWINDOW_H

---

And if you build this file with a simple main(), you get a completely blank widget?

Code:

---

int main(int argc, char **argv){
  QApplication app(argc, argv);
  QMainWindow mw;
  Ui::MainWindow ui;
  ui.setupUi(&mw);
  mw.show();
  return app.exec();
}

---

I test your code and I have nothing (a transparent widget)
But

Quote:

---

1.- I have tested the class in 'old' style (creating the instance, givin size, etc) and It is showed. ( an empty white QTreeView)
2.- If I extend the A_table to Qpushbutton.... promote works fine, I see an empty space at my form, but I see a button when run. (so, it is ok).
So, finally, I cannot extend a basic QTreeView using promote ?

---

Thanks

Please attach a complete archive with all the source files of your test project.

Here you are. If you see the code you can view the 'manually' added:

Code:

---

// This is 'manually' added.
   tabla=new A_tabla;
   tabla->setParent(ui->centralWidget);
   tabla->setGeometry(20,20,100,100);

---

which works.
Thanks

Geeezzz tonnot.... you're missing layouts in your ui...

Wysota, Why I need layouts ?
This is the reason because a Widget extending Qtreeview is not viewed using promote ?
And :

Quote:

---

1.- I have tested the class in 'old' style (creating the instance, givin size, etc) and It is showed. ( an empty white QTreeView)
2.- If I extend the A_table to Qpushbutton.... promote works fine, I see an empty space at my form, but I see a button when run. (so, it is ok).
So, finally, I cannot extend a basic QTreeView using promote ?

---

Quote:

---

Originally Posted by wysota

Geeezzz tonnot.... you're missing layouts in your ui...

---

:confused: You sound surprised.

Quote:

---

Originally Posted by tonnot

Ok, if you want here is the code, simply a skeleton.
[...]

Code:

---

#include "a_table.h"
A_table::A_table(QWidget *parent) : QTreeView()
{ }

---

---

Yeah, an incomplete one. You might want to pass the parent to the base class... That's why you don't see anything.

Ok, it works.
And, as a newbie, Why? A_table is already a Qobject....
Thanks

Quote:

---

Originally Posted by Lykurg

:confused: You sound surprised.

---

I am surprised. I thought that after writing 200 posts one would at least know how to use layouts. At times like this my hands fall down and I want to sit down and cry.