Qt palette (applied to form background) | August more text challenge

This is my 16th day of the August Genwen Challenge

@[TOC]

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The effect

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code

Create four sliders that look like this:

Set the maximum value for each slider to 255 because RGB is only 255 for each parameter.! [Insert picture description here]Img – blog. Csdnimg. Cn / 20200527174…=400x) then create four labels and a TextEdit to display text and color backplates:Here’s the code: Right-click slider to go to the slot and select valueChanged(int) to add the following code

    Q_UNUSED(value);
    QColor color;
    // Get the values of the four scroll bars
    int R = ui->verticalSlider->value(a);int G = ui->verticalSlider_2->value(a);int B = ui->verticalSlider_3->value(a);int A = ui->verticalSlider_4->value(a);/ / output debugging information qDebug () < < "R =" < < < < R "G =" < < < < G "B =" < < < < < < "A =" B A;
    color.setRgb(R,G,B,A);
    QString strClr = color.name(a);// "#XXXXX" strClr will get data in hexadecimal color
    QString strStyleSheet = QString("background-color: %1").arg( strClr ); //%1 uses arG concatenation strings similar to placeholders in printf()
    ui->textEdit->setStyleSheet( strStyleSheet ); // Change the textEdit stylesheet
	
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So you can see the color in the preview, but this is just the slot code for one of the sliders, and then we’ll associate the other three.

// Add the following code to the constructor
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
   // Add the code
    QObject::connect(ui->verticalSlider_2,SIGNAL(valueChanged(int)),this.SLOT(on_verticalSlider_valueChanged(int)));
    QObject::connect(ui->verticalSlider_3,SIGNAL(valueChanged(int)),this.SLOT(on_verticalSlider_valueChanged(int)));
    QObject::connect(ui->verticalSlider_4,SIGNAL(valueChanged(int)),this.SLOT(on_verticalSlider_valueChanged(int)));
    // Attach valueChanged(int) signals from different sliders to the first slot function, so that any of the four values that change send signals to call the slot function.
}
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What does this palette do? You can use it to set background colors.

To add the above code to the button’s slot function, simply change textEdit to Widget UI -> Widget ->setStyleSheet(strStyleSheet); Can.

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