Qt backgroundRole

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#include "mainwindow.h"

#include "ui_mainwindow.h"
#include "qcolordialog.h"

#include "qpalette.h"
MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

}
MainWindow::~MainWindow()

{

    delete ui;

}
void MainWindow::on_pushButton_clicked()

{

    QPalette w_palette = ui->textEdit->palette();

    const QColor &color = QColorDialog::getColor(w_palette.color(QPalette::Base), this);

    if(color.isValid())

    {

       w_palette.setColor(QPalette::Base, color);

       ui->textEdit->setPalette(w_palette);

    }

}
void MainWindow::on_pushButton_2_clicked()

{

    QPalette w_palette = this->palette();

    w_palette.setColor(backgroundRole(),QColor(128,64,212));//QColor(R,G,B)

    this->setPalette(w_palette);

}
void MainWindow::on_pushButton_3_clicked()

{

    //**not react??

    //QPalette w_palette = ui->lineEdit->palette();

    //w_palette.setColor(backgroundRole(),QColor(128,23,212));
    QPalette w_palette = ui->textEdit->palette();

    ui->lineEdit->setPalette(w_palette);

}




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