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Thread: QPushButton with a custom QLabel

  1. #1
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    Default QPushButton with a custom QLabel

    I am an absolute newbie. I am trying to test a simple application that has a pushbutton with colourful label and when I press that button, the application exits. But, its not working as expected.

    I am conceptually wrong somewhere.. Pls help..

    Qt Code:
    1. #include <QtGui/QApplication>
    2. #include <QLabel>
    3. #include <QPushButton>
    4.  
    5. int main(int argc, char *argv[])
    6. {
    7. QApplication a(argc, argv);
    8. QPushButton *button = new QPushButton(NULL);
    9. QLabel *label = new QLabel("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>",button,Qt::Window);
    10. QObject::connect(button, SIGNAL(clicked()),
    11. &a, SLOT(quit()));
    12.  
    13. label->setAlignment(Qt::AlignCenter|Qt::AlignVCenter);
    14. label->setWindowTitle("HelloWorld Test Program");
    15. label->show();
    16. return a.exec();
    17. }
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  2. #2
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    Default Re: QPushButton with a custom QLabel

    HI,
    use clear() instead of quit().If the slot is quit your application will terminate.
    Kavin

  3. #3
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    Default Re: QPushButton with a custom QLabel

    Quote Originally Posted by kavinsiva View Post
    HI,
    use clear() instead of quit().If the slot is quit your application will terminate.
    Thats the behavior I want. But, I am not getting the PushButton which I can press and exit the application. I am just getting a label which I cant press...

  4. #4
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    Default Re: QPushButton with a custom QLabel

    Hi,

    use Following program
    Qt Code:
    1. #include <QtGui/QApplication>
    2. #include <QLabel>
    3. #include <QPushButton>
    4. #include<QtGui>
    5.  
    6. int main(int argc, char *argv[])
    7. {
    8. QApplication a(argc, argv);
    9.  
    10. QPushButton *button = new QPushButton(Main);
    11. QLabel *label = new QLabel(Main);
    12. label->setText("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>");
    13. label->setVisible(true);
    14. label->setGeometry(30,30,40,80);
    15. QObject::connect(button, SIGNAL(clicked()),label, SLOT(clear()));
    16. label->setAlignment(Qt::AlignCenter|Qt::AlignVCenter);
    17. label->setWindowTitle("HelloWorld Test Program");
    18. Main->show();
    19. return a.exec();
    20. }
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    Kavin

  5. #5
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    Default Re: QPushButton with a custom QLabel

    That's because you set the button as the parent of the label. What you want doesn't work like you tried it.

    Here's a better solution (don't copy and past, check it first)
    Qt Code:
    1. QWidget *myContainerWidget = new QWidget;
    2. QGridLayout *myContainingLayout = new QGridLayout;
    3.  
    4. QLabel *myLabel = new QLabel;
    5. myLabel->setText("my label");
    6.  
    7. QPushButton *myButton = new QPushButton;
    8. myButton->setText("my button");
    9.  
    10. myContainingLayout->addWidget(myLabel);
    11. myContainingLayout->addWidget(myButton);
    12.  
    13. myContainerWidget->setLayout(myContainingLayout);
    14.  
    15. myContainerWidget->show();
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  6. #6
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    Default Re: QPushButton with a custom QLabel

    Quote Originally Posted by tbscope View Post
    That's because you set the button as the parent of the label. What you want doesn't work like you tried it.

    Here's a better solution (don't copy and past, check it first)
    Qt Code:
    1. QWidget *myContainerWidget = new QWidget;
    2. QGridLayout *myContainingLayout = new QGridLayout;
    3.  
    4. QLabel *myLabel = new QLabel;
    5. myLabel->setText("my label");
    6.  
    7. QPushButton *myButton = new QPushButton;
    8. myButton->setText("my button");
    9.  
    10. myContainingLayout->addWidget(myLabel);
    11. myContainingLayout->addWidget(myButton);
    12.  
    13. myContainerWidget->setLayout(myContainingLayout);
    14.  
    15. myContainerWidget->show();
    To copy to clipboard, switch view to plain text mode 

    I am sorry, I think I was not clear. I want a windows that has a pushButton with color text displayed on it. If the press that button, my app exits.
    I cant use the constructor to set text because then I cant use colorful text. Hope I am clear now. Now, what should I do?

  7. #7
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    Default Re: QPushButton with a custom QLabel

    @kavinsiva

    I cant press the button.. Thats what the problem is.. My code does what your code does.. But, dont know why but, I cant press the pushButton

  8. #8
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    Default Re: QPushButton with a custom QLabel

    Then rich text isn't possible with QPushButton.
    But... you can set the color and style of the complete text in a pushbutton via a stylesheet.

  9. #9
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    Default Re: QPushButton with a custom QLabel

    Ok, I researched a bit and got the answer.. The code for what I wanted is:-

    Qt Code:
    1. #include <QtGui/QApplication>
    2. #include <QLabel>
    3. #include <QPushButton>
    4. #include <QtGui>
    5. #include <QTextDocument>
    6.  
    7. int main(int argc, char *argv[])
    8. {
    9. QApplication a(argc, argv);
    10.  
    11. QPushButton *button = new QPushButton(Main);
    12. Text.setHtml("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>");
    13.  
    14. QPixmap pixmap(Text.size().width(), Text.size().height());
    15. pixmap.fill( Qt::transparent );
    16. QPainter painter( &pixmap );
    17. Text.drawContents(&painter, pixmap.rect());
    18.  
    19. QIcon ButtonIcon(pixmap);
    20. button->setIcon(ButtonIcon);
    21. button->setIconSize(pixmap.rect().size());
    22. QObject::connect(button, SIGNAL(clicked()),Main, SLOT(close()));
    23. Main->show();
    24. return a.exec();
    25. }
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  10. #10
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    Default Re: QPushButton with a custom QLabel

    Setting the label as a child of the button seems like a good way to do it . The button still works as expected and has its appearance defined by the label.
    Qt Code:
    1. #include <QApplication>
    2. #include <QPushButton>
    3. #include <QLabel>
    4.  
    5.  
    6.  
    7. int main(int argc, char *argv[])
    8. {
    9. QApplication a(argc, argv);
    10.  
    11. QPushButton *button = new QPushButton(NULL);
    12. QLabel *label = new QLabel("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>",button);
    13. QObject::connect(button, SIGNAL(clicked()), &a, SLOT(quit()));
    14. button->show();
    15. button->setWindowTitle("HelloWorld Test Program");
    16.  
    17. label->setAlignment(Qt::AlignCenter|Qt::AlignVCenter);
    18. label->show();
    19.  
    20. return a.exec();
    21. }
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