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Thread: Dynamic widget not displayed upon Qwidget

  1. 16th December 2007, 09:16 #1
    ashukla
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    Question Dynamic widget not displayed upon Qwidget

    Hi!
    I wants to put multiple dynamic QWidget inside QWidget widget. for this I am creating a QMainWindow and inside this I putted the Widget.
    In ui_mainwindow.h the variable is like this
    Qt Code: 
    1. public:
    2.     QAction *actionRect;
    3.     QWidget *centralwidget;
    4.     QWidget *widget;
    5.     QLineEdit *lineEdit;
    6.     QPushButton *pushButton;
    7.     QPushButton *pushButton_2;
    8.     QStatusBar *statusbar;
    9.     QToolBar *toolBar;
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    and in void setupUi(QMainWindow *MainWindow) code is following;
    Qt Code: 
    1. centralwidget = new QWidget(MainWindow);
    2.     centralwidget->setObjectName(QString::fromUtf8("centralwidget"));
    3.     widget = new QWidget(centralwidget);
    4.     widget->setObjectName(QString::fromUtf8("widget"));
    5.     widget->setGeometry(QRect(90, 0, 721, 561));
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    //mainwindow.h
    Qt Code: 
    1. #ifndef MAINWINDOW_H
    2. #define MAINWINDOW_H
    3. #include <QMainWindow>
    4. #include "ui_mainwindow.h"
    5.  
    6. class MainWindow: public QMainWindow, public Ui_MainWindow
    7. {
    8. 	Q_OBJECT
    9.  
    10. public:
    11.     MainWindow(QWidget *parent = 0);
    12.     QWidget *wd[100];
    13.  
    14. private slots:
    15. 	void newRect();
    16.  
    17. };
    18. #endif // MAINWINDOW_H
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    After that I am calling newRect slot which is connected with QAction *actionRect like this in MainWindow class constructor.
    //mainwindow.cpp
    Qt Code: 
    1. #include "mainwindow.h"
    2.  
    3. int num;
    4. MainWindow::MainWindow(QWidget *parent)
    5.     : QMainWindow(parent)
    6. {
    7.     setupUi(this);
    8.     num=1;
    9.  
    10.     connect(actionRect, SIGNAL(triggered()), this, SLOT(newRect()));
    11.  
    12. }
    13.  
    14. void MainWindow::newRect()
    15. {
    16. 	wd[num] = new QWidget(this->centralwidget);
    17. 	//wd[num]->setGeometry(5,50,30,30);
    18.  
    19. 	wd[num]->show();
    20. 	lineEdit->setText( QString::number(wd[num]->height()));
    21. 	num++;
    22.  
    23. }
    To copy to clipboard, switch view to plain text mode 
    My wd[num] widget is not displaying upon widget.
    What shuld I do for this?
    Anurag Shukla
    A man who never makes mistake is the man who never does anything! Theodre Rosvelt!
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  2. 16th December 2007, 13:53 #2
    c_07
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    Default Re: Dynamic widget not displayed upon Qwidget

    Perhaps create a QGridLayout inside the central widget, and add your sub-widgets to that?

    http://www.screencast.com/t/UOZtygllkz
    The screenshot is using the designer but you could do this dynamically in your code as well.
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  3. 17th December 2007, 07:03 #3
    ashukla
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    Default Re: Dynamic widget not displayed upon Qwidget

    Dear Experts!
    I redefine the situation;
    Firstly, I have putted a QWidget in a QMainWindow.
    A QMainWindow make a QWidget as a centralwidget for self.
    centralwidget is a child of QMainWindow & setted as a central window through Gui automatically. So that when I putted the QWidget widget inside QMainWindow It will be a child of centralwidget and so in turn is a child of QMainWindow.

    I am comming on my problem;
    I want to put dynammically QWidgets as a child of widget. So, I have make a newRect() slot for that. its code is following;
    Qt Code: 
    1. void MainWindow::newRect()
    2. {
    3. 	wd[num] = new QWidget(widget);
    4. 	wd[num]->show();
    5. 	lineEdit->setText( QString::number(wd[num]->height()));
    6. 	num++;
    7.  
    8. }
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    There is no widgets displays inside widget. but in lineEdit QWidget wd[num] height displays.

    If I am layouting the widget.
    At runtime message appears Layout is already set.

    How a way I show the widget?
    Thanking in advance!
    regards!
    Anurag Shukla
    A man who never makes mistake is the man who never does anything! Theodre Rosvelt!
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  4. 17th December 2007, 10:08 #4
    jacek
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    Default Re: Dynamic widget not displayed upon Qwidget

    Quote Originally Posted by ashukla View Post
    There is no widgets displays inside widget.
    What makes you think that these widgets aren't shown?

    Try:
    Qt Code: 
    1. wd[num] = new QPushButton( "aaa", widget );
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    Quote Originally Posted by ashukla View Post
    If I am layouting the widget.
    At runtime message appears Layout is already set.
    How do you set that layout and on which widget?
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  5. 17th December 2007, 10:52 #5
    ashukla
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    Default Re: Dynamic widget not displayed upon Qwidget

    Dear Sir!
    Qt Code: 
    1. #ifndef UI_MAINWINDOW_H
    2. #define UI_MAINWINDOW_H
    3.  
    4. #include <QtCore/QVariant>
    5. #include <QtGui/QAction>
    6. #include <QtGui/QApplication>
    7. #include <QtGui/QButtonGroup>
    8. #include <QtGui/QLabel>
    9. #include <QtGui/QLineEdit>
    10. #include <QtGui/QMainWindow>
    11. #include <QtGui/QStatusBar>
    12. #include <QtGui/QToolBar>
    13. #include <QtGui/QWidget>
    14.  
    15. class Ui_MainWindow
    16. {
    17. public:
    18.     QAction *actionRect;
    19.     QWidget *centralwidget;
    20.     QLineEdit *lineEditX;
    21.     QWidget *widget;
    22.     QLineEdit *lineEditY;
    23.     QLineEdit *lineEditHeight;
    24.     QLineEdit *lineEditWidth;
    25.     QLabel *labelX;
    26.     QLabel *labelY;
    27.     QLabel *labelHeight;
    28.     QLabel *labelWidth;
    29.     QStatusBar *statusbar;
    30.     QToolBar *toolBar;
    31.  
    32.     void setupUi(QMainWindow *MainWindow)
    33.     {
    34.     if (MainWindow->objectName().isEmpty())
    35.         MainWindow->setObjectName(QString::fromUtf8("MainWindow"));
    36.     MainWindow->resize(824, 600);
    37.     actionRect = new QAction(MainWindow);
    38.     actionRect->setObjectName(QString::fromUtf8("actionRect"));
    39.     actionRect->setIcon(QIcon(QString::fromUtf8("../undo/icons/rectangle.png")));
    40.     centralwidget = new QWidget(MainWindow);
    41.     centralwidget->setObjectName(QString::fromUtf8("centralwidget"));
    42.     lineEditX = new QLineEdit(centralwidget);
    43.     lineEditX->setObjectName(QString::fromUtf8("lineEditX"));
    44.     lineEditX->setGeometry(QRect(80, 40, 51, 31));
    45.     widget = new QWidget(centralwidget);
    46.     widget->setObjectName(QString::fromUtf8("widget"));
    47.     widget->setGeometry(QRect(160, 10, 661, 501));
    48.     QPalette palette;
    49.     QBrush brush(QColor(255, 255, 255, 255));
    50.     brush.setStyle(Qt::SolidPattern);
    51.     palette.setBrush(QPalette::Active, QPalette::Base, brush);
    52.     QBrush brush1(QColor(170, 255, 127, 255));
    53.     brush1.setStyle(Qt::SolidPattern);
    54.     palette.setBrush(QPalette::Active, QPalette::Window, brush1);
    55.     palette.setBrush(QPalette::Inactive, QPalette::Base, brush);
    56.     palette.setBrush(QPalette::Inactive, QPalette::Window, brush1);
    57.     palette.setBrush(QPalette::Disabled, QPalette::Base, brush1);
    58.     palette.setBrush(QPalette::Disabled, QPalette::Window, brush1);
    59.     widget->setPalette(palette);
    60.     widget->setAutoFillBackground(true);
    61.     lineEditY = new QLineEdit(centralwidget);
    62.     lineEditY->setObjectName(QString::fromUtf8("lineEditY"));
    63.     lineEditY->setGeometry(QRect(80, 80, 51, 31));
    64.     lineEditHeight = new QLineEdit(centralwidget);
    65.     lineEditHeight->setObjectName(QString::fromUtf8("lineEditHeight"));
    66.     lineEditHeight->setGeometry(QRect(80, 160, 51, 31));
    67.     lineEditWidth = new QLineEdit(centralwidget);
    68.     lineEditWidth->setObjectName(QString::fromUtf8("lineEditWidth"));
    69.     lineEditWidth->setGeometry(QRect(80, 120, 51, 31));
    70.     labelX = new QLabel(centralwidget);
    71.     labelX->setObjectName(QString::fromUtf8("labelX"));
    72.     labelX->setGeometry(QRect(50, 50, 21, 18));
    73.     labelY = new QLabel(centralwidget);
    74.     labelY->setObjectName(QString::fromUtf8("labelY"));
    75.     labelY->setGeometry(QRect(50, 90, 17, 18));
    76.     labelHeight = new QLabel(centralwidget);
    77.     labelHeight->setObjectName(QString::fromUtf8("labelHeight"));
    78.     labelHeight->setGeometry(QRect(30, 170, 47, 20));
    79.     labelWidth = new QLabel(centralwidget);
    80.     labelWidth->setObjectName(QString::fromUtf8("labelWidth"));
    81.     labelWidth->setGeometry(QRect(30, 130, 41, 18));
    82.     MainWindow->setCentralWidget(centralwidget);
    83.     statusbar = new QStatusBar(MainWindow);
    84.     statusbar->setObjectName(QString::fromUtf8("statusbar"));
    85.     MainWindow->setStatusBar(statusbar);
    86.     toolBar = new QToolBar(MainWindow);
    87.     toolBar->setObjectName(QString::fromUtf8("toolBar"));
    88.     MainWindow->addToolBar(Qt::TopToolBarArea, toolBar);
    89.  
    90.     toolBar->addAction(actionRect);
    91.  
    92.     retranslateUi(MainWindow);
    93.  
    94.     QMetaObject::connectSlotsByName(MainWindow);
    95.     } // setupUi
    96.  
    97.     void retranslateUi(QMainWindow *MainWindow)
    98.     {
    99.     MainWindow->setWindowTitle(QApplication::translate("MainWindow", "MainWindow", 0, QApplication::UnicodeUTF8));
    100.     actionRect->setText(QApplication::translate("MainWindow", "Rect", 0, QApplication::UnicodeUTF8));
    101.     labelX->setText(QApplication::translate("MainWindow", "X", 0, QApplication::UnicodeUTF8));
    102.     labelY->setText(QApplication::translate("MainWindow", "Y", 0, QApplication::UnicodeUTF8));
    103.     labelHeight->setText(QApplication::translate("MainWindow", "Height", 0, QApplication::UnicodeUTF8));
    104.     labelWidth->setText(QApplication::translate("MainWindow", "Width", 0, QApplication::UnicodeUTF8));
    105.     toolBar->setWindowTitle(QApplication::translate("MainWindow", "toolBar", 0, QApplication::UnicodeUTF8));
    106.     } // retranslateUi
    107.  
    108. };
    109.  
    110. namespace Ui {
    111.     class MainWindow: public Ui_MainWindow {};
    112. } // namespace Ui
    113.  
    114. #endif // UI_MAINWINDOW_H
    115.  
    116.  
    117.  
    118. #ifndef MAINWINDOW_H
    119. #define MAINWINDOW_H
    120. #include <QMainWindow>
    121. #include "ui_mainwindow.h"
    122. #include <QGridLayout>
    123. class MainWindow: public QMainWindow, public Ui_MainWindow
    124. {
    125. 	Q_OBJECT
    126.  
    127. public:
    128.     MainWindow(QWidget *parent = 0);
    129.     QWidget *wd[100];
    130.     QGridLayout *layout;
    131. private slots:
    132. 	void newRect();
    133.  
    134. };
    135. #endif // MAINWINDOW_H
    136.  
    137. //mainwindow.cpp
    138. #include "mainwindow.h"
    139.  
    140. int num;
    141. MainWindow::MainWindow(QWidget *parent)
    142.     : QMainWindow(parent)
    143. {
    144.     setupUi(this);
    145.     num=1;
    146.     layout = new QGridLayout();
    147.     connect(actionRect, SIGNAL(triggered()), this, SLOT(newRect()));
    148.  
    149. }
    150.  
    151. void MainWindow::newRect()
    152. {
    153. 	wd[num] = new QWidget(widget);
    154.  
    155. 	layout->addWidget(wd[num]);
    156. 	widget->setLayout(layout);
    157.     wd[num]->show();
    158. 	lineEditX->setText( QString::number(wd[num]->x()));
    159. 	lineEditY->setText( QString::number(wd[num]->y()));
    160. 	lineEditWidth->setText( QString::number(wd[num]->width()));
    161. 	lineEditHeight->setText( QString::number(wd[num]->height()));
    162. 	num++;
    163.  
    164. }
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    The code is as above.
    It displays the coordinates in its QLineEdit; but not displays the run time QWidget wd[num].
    What should I do for that?
    Anurag Shukla
    A man who never makes mistake is the man who never does anything! Theodre Rosvelt!
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  6. 17th December 2007, 11:11 #6
    jacek
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    Default Re: Dynamic widget not displayed upon Qwidget

    Quote Originally Posted by ashukla View Post
    widget->setLayout(layout);
    Setting the layout more than once is asking for trouble. Move that line to the constructor.

    Quote Originally Posted by ashukla View Post
    but not displays the run time QWidget wd[num].
    What should I do for that?
    What do you expect to see? QWidgets are transparent. Try creating QPushButtons to see if your code works.
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