QPushButton with a custom QLabel

[shadyabhi]

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..

#include <QtGui/QApplication>
#include <QLabel>
#include <QPushButton>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QPushButton *button = new QPushButton(NULL);
    QLabel *label = new QLabel("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>",button,Qt::Window);
    QObject::connect(button, SIGNAL(clicked()),
    &a, SLOT(quit()));
 
    label->setAlignment(Qt::AlignCenter|Qt::AlignVCenter);
    label->setWindowTitle("HelloWorld Test Program");
    label->show();
    return a.exec();
}

#include <QtGui/QApplication>
#include <QLabel>
#include <QPushButton>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QPushButton *button = new QPushButton(NULL);
    QLabel *label = new QLabel("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>",button,Qt::Window);
    QObject::connect(button, SIGNAL(clicked()),
    &a, SLOT(quit()));
    
    label->setAlignment(Qt::AlignCenter|Qt::AlignVCenter);
    label->setWindowTitle("HelloWorld Test Program");
    label->show();
    return a.exec();
}

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[kavinsiva]

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

[shadyabhi]

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...

[kavinsiva]

Hi,

use Following program

#include <QtGui/QApplication>
#include <QLabel>
#include <QPushButton>
#include<QtGui>
 
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QMainWindow *Main=new QMainWindow;
 
QPushButton *button = new QPushButton(Main);
QLabel *label = new QLabel(Main);
label->setText("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>");
label->setVisible(true);
label->setGeometry(30,30,40,80);
QObject::connect(button, SIGNAL(clicked()),label, SLOT(clear()));
label->setAlignment(Qt::AlignCenter|Qt::AlignVCenter);
label->setWindowTitle("HelloWorld Test Program");
Main->show();
return a.exec();
}

#include <QtGui/QApplication>
#include <QLabel>
#include <QPushButton>
#include<QtGui>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QMainWindow *Main=new QMainWindow;

QPushButton *button = new QPushButton(Main);
QLabel *label = new QLabel(Main);
label->setText("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>");
label->setVisible(true);
label->setGeometry(30,30,40,80);
QObject::connect(button, SIGNAL(clicked()),label, SLOT(clear()));
label->setAlignment(Qt::AlignCenter|Qt::AlignVCenter);
label->setWindowTitle("HelloWorld Test Program");
Main->show();
return a.exec();
}

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[tbscope]

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)

QWidget *myContainerWidget = new QWidget;
QGridLayout *myContainingLayout = new QGridLayout;
 
QLabel *myLabel = new QLabel;
myLabel->setText("my label");
 
QPushButton *myButton = new QPushButton;
myButton->setText("my button");
 
myContainingLayout->addWidget(myLabel);
myContainingLayout->addWidget(myButton);
 
myContainerWidget->setLayout(myContainingLayout);
 
myContainerWidget->show();

QWidget *myContainerWidget = new QWidget;
QGridLayout *myContainingLayout = new QGridLayout;

QLabel *myLabel = new QLabel;
myLabel->setText("my label");

QPushButton *myButton = new QPushButton;
myButton->setText("my button");

myContainingLayout->addWidget(myLabel);
myContainingLayout->addWidget(myButton);

myContainerWidget->setLayout(myContainingLayout);

myContainerWidget->show();

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[shadyabhi]

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)

QWidget *myContainerWidget = new QWidget;
QGridLayout *myContainingLayout = new QGridLayout;
 
QLabel *myLabel = new QLabel;
myLabel->setText("my label");
 
QPushButton *myButton = new QPushButton;
myButton->setText("my button");
 
myContainingLayout->addWidget(myLabel);
myContainingLayout->addWidget(myButton);
 
myContainerWidget->setLayout(myContainingLayout);
 
myContainerWidget->show();

QWidget *myContainerWidget = new QWidget;
QGridLayout *myContainingLayout = new QGridLayout;

QLabel *myLabel = new QLabel;
myLabel->setText("my label");

QPushButton *myButton = new QPushButton;
myButton->setText("my button");

myContainingLayout->addWidget(myLabel);
myContainingLayout->addWidget(myButton);

myContainerWidget->setLayout(myContainingLayout);

myContainerWidget->show();

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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?

[shadyabhi]

@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

[tbscope]

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.

[shadyabhi]

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

#include <QtGui/QApplication>
#include <QLabel>
#include <QPushButton>
#include <QtGui>
#include <QTextDocument>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMainWindow *Main=new QMainWindow;
 
    QPushButton *button = new QPushButton(Main);
    QTextDocument Text;
    Text.setHtml("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>");
 
    QPixmap pixmap(Text.size().width(), Text.size().height());
    pixmap.fill( Qt::transparent );
    QPainter painter( &pixmap );
    Text.drawContents(&painter, pixmap.rect());
 
    QIcon ButtonIcon(pixmap);
    button->setIcon(ButtonIcon);
    button->setIconSize(pixmap.rect().size());
    QObject::connect(button, SIGNAL(clicked()),Main, SLOT(close()));
    Main->show();
    return a.exec();
}

#include <QtGui/QApplication>
#include <QLabel>
#include <QPushButton>
#include <QtGui>
#include <QTextDocument>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMainWindow *Main=new QMainWindow;

    QPushButton *button = new QPushButton(Main);
    QTextDocument Text;
    Text.setHtml("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>");

    QPixmap pixmap(Text.size().width(), Text.size().height());
    pixmap.fill( Qt::transparent );
    QPainter painter( &pixmap );
    Text.drawContents(&painter, pixmap.rect());

    QIcon ButtonIcon(pixmap);
    button->setIcon(ButtonIcon);
    button->setIconSize(pixmap.rect().size());
    QObject::connect(button, SIGNAL(clicked()),Main, SLOT(close()));
    Main->show();
    return a.exec();
}

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[markanth]

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.

#include <QApplication>
#include <QPushButton>
#include <QLabel>
 
 
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
    QPushButton *button = new QPushButton(NULL);
    QLabel *label = new QLabel("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>",button);
    QObject::connect(button, SIGNAL(clicked()), &a, SLOT(quit()));
    button->show();
    button->setWindowTitle("HelloWorld Test Program");
 
    label->setAlignment(Qt::AlignCenter|Qt::AlignVCenter);
    label->show();
 
    return a.exec();
}

#include <QApplication>
#include <QPushButton>
#include <QLabel>



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

    QPushButton *button = new QPushButton(NULL);
    QLabel *label = new QLabel("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>",button);
    QObject::connect(button, SIGNAL(clicked()), &a, SLOT(quit()));
    button->show();
    button->setWindowTitle("HelloWorld Test Program");

    label->setAlignment(Qt::AlignCenter|Qt::AlignVCenter);
    label->show();

    return a.exec();
}

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