Set background color of QLabel using Qt Style Sheet and QColorDialog

JimmyMars

I want to set the background of a label using Qt Style Sheet.
I don't want to use QPalette.
The user needs to select the color from the QColorDialog.
I have set the function setColor() as a slot inside Class SelectColor.
The variable rgba is declared as type QRgb inside the header file under private access.

How can I pass in the variable rgba as argument for setStyleSheet() ?

This is not working, it just set the background color to black:
selectcolor.cpp:

...
void SelectColor::setColor() {
    QColor color = QColorDialog::getColor(QColor(m_label->text()), this);
    color.fromRgba(rgba);
    m_label->setText(color.name());
    m_label->setStyleSheet("background-color : rgba");
}

selectcolor.h:

#ifndef SELECTCOLOR_H
#define SELECTCOLOR_H

#include <QLabel>
#include <QPushButton>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QPalette>
#include <QColor>
#include <QColorDialog>

class QLabel;

class SelectColor : public QWidget {
    Q_OBJECT
public:
    SelectColor(QWidget *parent = 0);
public slots:
    void setColor();
signals:
    // No signals
private:
    QLabel *m_label;
    QRgb rgba;
};

#endif // SELECTCOLOR_H

Eddy

Hi JimmyMars ,

Why not using a QString that combines the background part and the color . name () part

something like this:

QString str = " background-color : " ;
str += color. name();
ui->label->setStyleSheet(str);

JimmyMars

@Eddy
But how do I change the background color using Qt Style sheet?
I just don't know how to pass that rgba variable to that function.

mrjj

@JimmyMars
Hi its a little unclear what you ask about ?
You can construct the stylesheet string as @Eddy shows.
That will contain the color selected.

I just don't know how to pass that rgba variable to that function.
What function are we talking about?

Eddy

@JimmyMars

QString str = " background-color : " ;
QColor col (255,125,255);//takes rgb values
str += col.name();
ui->label->setStyleSheet(str);