QT learning 20 standard dialog box in QT (middle)

Qt Study 20 Qt Standard dialog boxes in （ in ）

Color dialog

• Qt Provided in predefined Color dialog QColorDialog class
• QColorDialog Class is used to provide Dialog box for specifying colors

• How to use the color dialog

//  Construct color dialog objects 
QColorDialog dlg(this);
//  Set the relevant properties of the color dialog 
dlg.setWindowTitle("Color Editor");
dlg.setCurrentColor(Qt::red);	//  Initial color 

if (dlg.exec() == QColorDialog::Accepted) {
    
    qDebug() << dlg.selectedColor();
}

• Qt Medium QColor Class is used to represent the concept of color in programs
• QColor Class also supports Multiple color representations
  • RGB： In red , green , Three color model based on blue
  • HSV： In tone , saturation , Based on lightness Hexagonal cone model
  • CMYK： With sky blue , magenta , yellow , Black based Full color printing color model

Input Dialog

• Qt Provided in predefined Input dialog box QInputDialog class
• QInputDialog Class used Occasions requiring temporary data input

• How to use the input dialog

//  Construct the input dialog 
QInputDialog dlg(this);
//  Set the relevant properties of the input dialog 
dlg.setWindowTitle("Input ...");
dlg.setLabelText("Please enter a integer: ");
dlg.setInputMode(QInputDialog::IntInput);

if (dlg.exec() == QInputDialog::Accepted)
{
    
    qDebug() << dlg.intValue();
}

• Enter the... Of the dialog box The input mode
  • QInputDialog::TextInput Enter a text string
  • QInputDialog::IntInput Input integer number
  • QInputDialog::DoubleInput Enter floating point number

Code experiments

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QPushButton>

class Widget : public QWidget
{
    
    Q_OBJECT
private:
    QPushButton ColorDialogBtn;
    QPushButton InputDialogBtn;
private slots:
    void ColorDialogBtn_Clicked();
    void InputDialogBtn_Clicked();
public:
    Widget(QWidget *parent = 0);
    ~Widget();
};

#endif // WIDGET_H

#include "Widget.h"
#include <QDebug>
#include <QColorDialog>
#include <QInputDialog>

Widget::Widget(QWidget *parent)
    : QWidget(parent), ColorDialogBtn(this), InputDialogBtn(this)
{
    
    ColorDialogBtn.setText("Color Dialog");
    ColorDialogBtn.move(20, 20);
    ColorDialogBtn.resize(160, 30);

    InputDialogBtn.setText("Input Dialog");
    InputDialogBtn.move(20, 70);
    InputDialogBtn.resize(160, 30);

    resize(200, 120);
    setFixedSize(200, 120);

    connect(&ColorDialogBtn, SIGNAL(clicked()), this, SLOT(ColorDialogBtn_Clicked()));
    connect(&InputDialogBtn, SIGNAL(clicked()), this, SLOT(InputDialogBtn_Clicked()));
}

Widget::~Widget()
{
    

}

void Widget::ColorDialogBtn_Clicked()
{
    
    QColorDialog dlg(this);

    dlg.setWindowTitle("Color Editor");
    dlg.setCurrentColor(Qt::red);
    if (dlg.exec() == QColorDialog::Accepted) {
    
        QColor color = dlg.selectedColor();
        qDebug() << color;
        qDebug() << color.red();
        qDebug() << color.green();
        qDebug() << color.blue();
        qDebug() << color.hue();
        qDebug() << color.saturation();
        qDebug() << color.value();
    }
    //  Simple usage 
    QColor c = QColorDialog::getColor(Qt::red, this, "Color Edit");
    qDebug() << c;
}

void Widget::InputDialogBtn_Clicked()
{
    
    QInputDialog dlg(this);

    dlg.setWindowTitle("Input Test");
    dlg.setLabelText("Please input a string:");
    dlg.setInputMode(QInputDialog::TextInput);

    if (dlg.exec() == QInputDialog::Accepted) {
    
        qDebug() << dlg.textValue();
    }
    //  Simple usage 
    qDebug() << QInputDialog::getDouble(this, "Input double", "Please input double:");
    qDebug() << QInputDialog::getInt(this, "Input int", "Please input int:");
    QStringList ql;
    QStringList items;
    items << tr("Spring") << tr("Summer") << tr("Fall") << tr("Winter");

    bool ok;
    QString item = QInputDialog::getItem(this, tr("QInputDialog::getItem()"),
                                       tr("Season:"), items, 0, false, &ok);
    qDebug() << item;
    QString str = QInputDialog::getText(this, "getText", "Please input text:");
    qDebug() << str;
}

#include "Widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}

Summary

• QColorDialog Class is used to provide Dialog box parts with assigned colors
• QColor Class is used in programs to represent Color The concept of
• QInputDialog Class used Occasions requiring temporary data input