Qt dialog box (QFileDialog), standard color dialog box (QColorDialog), standard font dialog box (QFontDialog), standard input dialog box (QInputDialog), QMessageDialog

Introduce the use of standard file dialog (QFileDialog), standard color dialog (QColorDialog), standard font dialog (QFontDialog), standard input dialog (QInputDialog) and standard message dialog (QMessageDialog)

Standard file dialog (QFileDialog)

code introduction

head File:

private slots:
    void showFile(); // fileBtn 点击触发
private:
    QGridLayout *mainLayOut; // 网格布局布局    
    // 标准文件对话框成员变量
    QPushButton *fileBtn; // 点击按钮弹出 标准文件对话框
    QLineEdit *fileLineEdit; // 显示标准对话框选择的文件

cpp file:

void Dialog::showFile()
{
    
    
    QString str = QFileDialog::getOpenFileName(this,"Open file dialog","D:\\",
                                               tr("C++ files(*.cpp);;C files(*.c);;Head files(*.h)"));
    fileLineEdit->setText(str);
}

void Dialog::createQFileDialog()
{
    
    
    // 创建组件
    fileBtn = new QPushButton;
    fileBtn->setText(tr("文件标准对话框实例"));
    fileLineEdit = new QLineEdit;

    // 布局
    mainLayOut->addWidget(fileBtn,0,0);
    mainLayOut->addWidget(fileLineEdit,0,1);

    // 关联事件
    connect(fileBtn,SIGNAL(clicked()),this,SLOT(showFile()));
}

getOpenFileNameFunction introduction

QString QFileDialog::getOpenFileName
(
QWidget *parent = nullptr,	// 父窗口
const QString &caption = QString(),	// 标题
const QString &dir = QString(), 	// 默认目录，若带文件名，则此文件为默认选中的文件
const QString &filter = QString(),	// 文件类型过滤，多种过滤器之间用;;隔开
QString *selectedFilter = nullptr,	// 用户选择的过滤器通过此返回
QFileDialog::Options options = Options()	// 选择显示文件名的格式，默认同时显示目录和文件名
)

Commonly used static functions of the QFileDialog class

static function	function description
getOpenFileName	Get the filename selected by the user
getOpenFileNames	Get a list of filenames selected by the user
getSaveFileName	Get the filename saved by the user
getExistingDirectory	Get the existing directory name selected by the user

Standard Color Dialog (QColorDialog)

code introduction

head File:

private slots:
    void showColor(); // colorBtn
private:
    // 标准颜色对话框成员变量
    QPushButton *colorBtn;
    QFrame *colorFrame; // 显示选择的颜色

cpp file:

void Dialog::showColor()
{
    
    
    QColor color = QColorDialog::getColor(Qt::blue);
    if(color.isValid()){
    
    
        colorFrame->setPalette(QPalette(color));
    }
}
void Dialog::createQColorDialog()
{
    
    
    colorBtn = new QPushButton;
    colorBtn->setText(tr("标准颜色对话框实例"));
    colorFrame = new QFrame;
    colorFrame->setFrameShape(QFrame::Box);
    colorFrame->setAutoFillBackground(true);

    mainLayOut->addWidget(colorBtn,1,0);
    mainLayOut->addWidget(colorFrame,1,1);

    connect(colorBtn,SIGNAL(clicked()),this,SLOT(showColor()));
}

getColorFunction introduction

QColor QColorDialog::getColor
(
const QColor &initial = Qt::white,	// 默认选中颜色
 QWidget *parent = nullptr,	// 父窗口
 const QString &title = QString(), // 窗口 title ，如果未指定，则为Select Color
 QColorDialog::ColorDialogOptions options = ColorDialogOptions() // 允许自定义对话框
 )

Commonly used static functions of the QColorDialog class

static function	function description
getColor	Get the color value selected by the user

Standard font dialog (QFontDialog)

code introduction

head File:

private slots:
    void showFont(); // fontBtn
private:
    // 标准字体对话框成员变量
    QPushButton *fontBtn;
    QLineEdit *fontLineEdit;

cpp file:

void Dialog::showFont()
{
    
    
    bool isOK = false;
    QFont font = QFontDialog::getFont(&isOK);
    if(isOK){
    
    
        fontLineEdit->setFont(font);
    }
}
void Dialog::createQFontDialog()
{
    
    
    fontBtn = new QPushButton;
    fontBtn->setText(tr("标准字体对话框实例"));
    fontLineEdit = new QLineEdit;
    fontLineEdit->setText(tr("Welcome"));

    mainLayOut->addWidget(fontBtn,2,0);
    mainLayOut->addWidget(fontLineEdit,2,1);

    connect(fontBtn,SIGNAL(clicked()),this,SLOT(showFont()));
}

getFontFunction introduction

QFont QFontDialog::getFont
(
bool *ok,	// 用户点击ok，设置为true，并返回用户选择字体，否则设置为false，返回默认字体
QWidget *parent = nullptr	// 父窗口
)

Commonly used static functions of the QFontDialog class

static function	function description
getFont	Get the font selected by the user

Standard Input Dialog (QInputDialog)

Demonstrates the input of four data types provided by the standard input dialog box, including string, drop-down list, int data type and double data type.

Here, an InputDlg is customized for the main interface button bullet box display, and the above four types are placed in InputDlg. Click different modify buttons to pop up different types of standard input dialog boxes

Introduction to the main interface code

head File:

private slots:
    void showInputDlg(); // inputBtn
private:
    // 标准输入对话框
    QPushButton *inputBtn;
    InputDlg *inputDlg;

cpp file:

void Dialog::showInputDlg()
{
    
    
    inputDlg = new InputDlg(this);
    inputDlg->show();
}
void Dialog::createQInputDialog()
{
    
    
    inputBtn = new QPushButton;
    inputBtn->setText(tr("标准输入对话框实例"));

    mainLayOut->addWidget(inputBtn,3,0);
    connect(inputBtn,SIGNAL(clicked()),this,SLOT(showInputDlg()));
}

Custom InputDlg

Clicking different modify buttons pops up different input dialog boxes

head File:

#define INPUTDLG_H

#include <QDialog>
#include <QGridLayout> // 用于布局设计
#include <QPushButton>
#include <QLabel>

class InputDlg : public QDialog
{
    
    
    Q_OBJECT // 用于signal和slot机制的使用
public:
    InputDlg(QWidget *parent = nullptr);
private slots:
    void changeName();  // 演示字符串类型 nameBtn
    void changeSex();   // 演示下拉列表
    void changeAge();   // 演示int数据类型
    void changeScore(); // 演示double数据类型
private:
    QGridLayout *mainLayout;
    // 用于 标准输入对话框 演示字符串类型
    QLabel *nameLabel1; // 显示 姓名
    QLabel *nameLabel2; // 显示 具体名字 由按钮弹框修改，标准输入对话框的字符串类型
    QPushButton *nameBtn; // 修改 姓名的按钮

    // 用于 标准输入对话框 演示下拉列表
    QLabel *sexLabel1;
    QLabel *sexLabel2;
    QPushButton *sexBtn;

    // 用于 标准输入对话框 演示int数据类型
    QLabel *ageLabel1;
    QLabel *ageLabel2;
    QPushButton *ageBtn;

    // 用于 标准输入对话框 演示double数据类型
    QLabel *scoreLabel1;
    QLabel *scoreLabel2;
    QPushButton *scoreBtn;
};

#endif // INPUTDLG_H

cpp file:

#include "inputdlg.h"

#include <QInputDialog>

InputDlg::InputDlg(QWidget *parent)
    :QDialog(parent)
{
    
    
    setWindowTitle(tr("标准输入对话框实例"));

    nameLabel1 = new QLabel;
    nameLabel1->setText(tr("姓名:"));
    nameLabel2 = new QLabel;
    nameLabel2->setText(tr("李四"));
    nameLabel2->setFrameStyle(QFrame::Panel|QFrame::Sunken);
    nameBtn = new QPushButton;
    nameBtn->setText(tr("修改姓名"));

    sexLabel1 = new QLabel;
    sexLabel1->setText(tr("性别:"));
    sexLabel2 = new QLabel;
    sexLabel2->setText(tr("男"));
    sexLabel2->setFrameStyle(QFrame::Panel|QFrame::Sunken);
    sexBtn = new QPushButton;
    sexBtn->setText(tr("修改性别"));

    ageLabel1 = new QLabel;
    ageLabel1->setText(tr("年龄:"));
    ageLabel2 = new QLabel;
    ageLabel2->setText(tr("21"));
    ageLabel2->setFrameStyle(QFrame::Panel|QFrame::Sunken);
    ageBtn = new QPushButton;
    ageBtn->setText(tr("修改年龄"));

    scoreLabel1 = new QLabel;
    scoreLabel1->setText(tr("分数:"));
    scoreLabel2 = new QLabel;
    scoreLabel2->setText(tr("89"));
    scoreLabel2->setFrameStyle(QFrame::Panel|QFrame::Sunken);
    scoreBtn = new QPushButton;
    scoreBtn->setText(tr("修改分数"));

    mainLayout = new QGridLayout(this);
    mainLayout->addWidget(nameLabel1,0,0);
    mainLayout->addWidget(nameLabel2,0,1);
    mainLayout->addWidget(nameBtn,0,2);

    mainLayout->addWidget(sexLabel1,1,0);
    mainLayout->addWidget(sexLabel2,1,1);
    mainLayout->addWidget(sexBtn,1,2);

    mainLayout->addWidget(ageLabel1,2,0);
    mainLayout->addWidget(ageLabel2,2,1);
    mainLayout->addWidget(ageBtn,2,2);

    mainLayout->addWidget(scoreLabel1,3,0);
    mainLayout->addWidget(scoreLabel2,3,1);
    mainLayout->addWidget(scoreBtn,3,2);
    mainLayout->setSpacing(10);
    mainLayout->setMargin(15);

    connect(nameBtn,SIGNAL(clicked()),this,SLOT(changeName()));
    connect(sexBtn,SIGNAL(clicked()),this,SLOT(changeSex()));
    connect(ageBtn,SIGNAL(clicked()),this,SLOT(changeAge()));
    connect(scoreBtn,SIGNAL(clicked()),this,SLOT(changeScore()));
}

void InputDlg::changeName()
{
    
    
    bool isOk = false;
    QString text = QInputDialog::getText(this,tr("标准字符串输入对话框"),
                                         tr("请输入姓名:"),QLineEdit::Normal,nameLabel2->text(),&isOk);
    if(isOk && !text.isEmpty()){
    
    
        nameLabel2->setText(text);
    }
}

void InputDlg::changeSex()
{
    
    
    QStringList sexItems;
    sexItems.push_back(tr("男"));
    sexItems.push_back(tr("女"));
    bool isOk = false;
    QString sexItem = QInputDialog::getItem(this,tr("标准条目选择对话框"),
                                         tr("请选择性别:"),sexItems,0,false,&isOk);
    if(isOk && !sexItem.isEmpty()){
    
    
        sexLabel2->setText(sexItem);
    }
}

void InputDlg::changeAge()
{
    
    
    bool isOk = false;
    int age = QInputDialog::getInt(this,tr("标准int类型输入对话框"),
                                         tr("请输入年龄:"),ageLabel2->text().toInt(&isOk),0,100,1,&isOk);
    if(isOk){
    
    
        ageLabel2->setText(QString(tr("%1")).arg(age));
    }
}

void InputDlg::changeScore()
{
    
    
    bool isOk = false;
    double score = QInputDialog::getDouble(this,tr("标准double类型输入对话框"),
                                         tr("请输入分数:"),scoreLabel2->text().toDouble(&isOk),0,100,1,&isOk);
    if(isOk){
    
    
        scoreLabel2->setText(QString(tr("%1")).arg(score));
    }
}

The definitions of static functions QInputDialog::getText, QInputDialog::getItem, QInputDialog::getInt, QInputDialog::getDoublecan refer to the help manual of QT

Standard message dialog (QMessageBox)

It demonstrates the commonly used message dialog boxes including Question message box, Information message box, Warning message box, Critical message box, About (about) message box, About (about) Qt message box and Custom (custom) message box.

Here, a MsgBoxDlg class is customized for the main interface button bullet box display, and the above message box is placed in MsgBoxDlg. Clicking different modification buttons will pop up different message boxes.

Introduction to the main interface code

head File:

private slots:
    void showMsgDlg(); // msgBtn
private:
    //消息对话框
    QPushButton *msgBtn;
    MsgBoxDlg *msgDlg;

cpp file:

void Dialog::showMsgDlg()
{
    
    
    msgDlg = new MsgBoxDlg(this);
    msgDlg->show();
}
void Dialog::createQMessageDialog()
{
    
    
    msgBtn = new QPushButton;
    msgBtn->setText(tr("标准消息对话框实例"));

    mainLayOut->addWidget(msgBtn,3,1);
    connect(msgBtn,SIGNAL(clicked()),this,SLOT(showMsgDlg()));
}

Custom MsgBoxDlg

Click different buttons to pop up different message boxes

head File:

#include <QDialog>
#include <QGridLayout> // 用于布局设计
#include <QPushButton>
#include <QLabel>

class MsgBoxDlg : public QDialog
{
    
    
    Q_OBJECT
public:
    MsgBoxDlg(QWidget *parent = nullptr);
private slots:
    void showQuestionMsg(); // questionBtn
    void showInformationMsg(); // informationBtn
    void showWarningMsg(); // warningBtn
    void showCriticalMsg(); // criticalBtn
    void showAboutMsg(); // aboutBtn
    void showAboutQtMsg(); // aboutQtBtn
private:
    QGridLayout *mainLayout;
    QLabel *label; // 显示选择了什么消息框
    QPushButton *questionBtn;
    QPushButton *informationBtn;
    QPushButton *warningBtn;
    QPushButton *criticalBtn;
    QPushButton *aboutBtn;
    QPushButton *aboutQtBtn;
};

cpp file

MsgBoxDlg::MsgBoxDlg(QWidget *parent)
    :QDialog(parent)
{
    
    
    setWindowTitle(tr("标准消息对话框实例"));
    label = new QLabel;
    label->setText(tr("请选择一种消息框"));

    questionBtn = new QPushButton;
    questionBtn->setText(tr("QuestionMsg"));
    informationBtn = new QPushButton;
    informationBtn->setText(tr("InformationMsg"));
    warningBtn = new QPushButton;
    warningBtn->setText(tr("WarningMsg"));
    criticalBtn = new QPushButton;
    criticalBtn->setText(tr("CriticalMsg"));
    aboutBtn = new QPushButton;
    aboutBtn->setText(tr("AboutMsg"));
    aboutQtBtn = new QPushButton;
    aboutQtBtn->setText(tr("AboutQtMsg"));

    mainLayout = new QGridLayout(this);
    mainLayout->addWidget(label,0,0,1,2);
    mainLayout->addWidget(questionBtn,1,0);
    mainLayout->addWidget(informationBtn,1,1);
    mainLayout->addWidget(warningBtn,2,0);
    mainLayout->addWidget(criticalBtn,2,1);
    mainLayout->addWidget(aboutBtn,3,0);
    mainLayout->addWidget(aboutQtBtn,3,1);

    connect(questionBtn,SIGNAL(clicked()),this,SLOT(showQuestionMsg()));
    connect(informationBtn,SIGNAL(clicked()),this,SLOT(showInformationMsg()));
    connect(warningBtn,SIGNAL(clicked()),this,SLOT(showWarningMsg()));
    connect(criticalBtn,SIGNAL(clicked()),this,SLOT(showCriticalMsg()));
    connect(aboutBtn,SIGNAL(clicked()),this,SLOT(showAboutMsg()));
    connect(aboutQtBtn,SIGNAL(clicked()),this,SLOT(showAboutQtMsg()));
}

void MsgBoxDlg::showQuestionMsg()
{
    
    
    label->setText(tr("Question Message Box"));

    auto ret = QMessageBox::question(this,tr("Question消息框"),
                tr("Question消息框显示演示"),
                QMessageBox::Ok|QMessageBox::Cancel,QMessageBox::Ok);

    switch(ret){
    
    
    case QMessageBox::Ok:
        label->setText(tr("Question Button/OK"));
        break;
    case QMessageBox::Cancel:
        label->setText(tr("Question Button/Cancel"));
        break;
    default:
        break;
    }
    return;
}

void MsgBoxDlg::showInformationMsg()
{
    
    
    label->setText(tr("Information Message Box"));
    QMessageBox::information(this,tr("Information消息框"),
                tr("Information消息框显示演示"));
    return;
}

void MsgBoxDlg::showWarningMsg()
{
    
    
    label->setText(tr("Warning Message Box"));

    auto ret = QMessageBox::warning(this,tr("Warning消息框"),
                tr("Warning消息框显示演示"),
                QMessageBox::Save|QMessageBox::Discard|QMessageBox::Cancel,
                QMessageBox::Save);

    switch(ret){
    
    
    case QMessageBox::Save:
        label->setText(tr("Warning Button/Save"));
        break;
    case QMessageBox::Discard:
        label->setText(tr("Warning Button/Discard"));
        break;
    case QMessageBox::Cancel:
        label->setText(tr("Warning Button/Cancel"));
        break;
    default:
        break;
    }
    return;
}

void MsgBoxDlg::showCriticalMsg()
{
    
    
    label->setText(tr("Critical Message Box"));
    QMessageBox::critical(this,tr("Critical消息框"),
                tr("Information消息框显示演示"));
    return;
}

void MsgBoxDlg::showAboutMsg()
{
    
    
    label->setText(tr("About Message Box"));
    QMessageBox::about(this,tr("About消息框"),
                tr("About消息框显示演示"));
    return;
}

void MsgBoxDlg::showAboutQtMsg()
{
    
    
    label->setText(tr("AboutQt Message Box"));
    QMessageBox::aboutQt(this,tr("AboutQt消息框"));
    return;
}

QMessageBox::question、QMessageBox::information、QMessageBox::warning、QMessageBox::critical、QMessageBox::about、QMessageBox::aboutQtFor the definition of static functions, please refer to the QT help manual

custom message box

code introduction

head File:

private slots:
    void showCustomDlg(); // customBtn
private:
    // 自定义消息框
    QPushButton *customBtn;
    QLabel *label;

cpp file:

void Dialog::showCustomDlg()
{
    
    
    label->setText(tr("Custom Message Box"));
    QMessageBox customMsgBox;
    customMsgBox.setWindowTitle(tr("用户自定义消息框"));
    QPushButton *yesBtn = customMsgBox.addButton(tr("Yes"),QMessageBox::ActionRole); // 自定义按钮，参数为 按钮显示文字，按钮类型
    QPushButton *noBtn = customMsgBox.addButton(tr("no"),QMessageBox::ActionRole);
    QPushButton *cancelBtn = customMsgBox.addButton(QMessageBox::Cancel); // 加入 标准按钮， 按addButton顺序从左到右依次加入
    customMsgBox.setText(tr("这是一个用户自定义消息框"));
    // customMsgBox.setIconPixmap(QPixmap("xx.png")); // 自定义图标
    customMsgBox.exec();
    auto ret = customMsgBox.clickedButton();
    if(ret == yesBtn){
    
    
        label->setText(tr("Custom Message Box/Yes"));
    }
    if(ret == noBtn){
    
    
        label->setText(tr("Custom Message Box/No"));
    }
    if(ret == cancelBtn){
    
    
        label->setText(tr("Custom Message Box/Cancel"));
    }
    return;
}
void Dialog::createCustomDialog()
{
    
    
    customBtn = new QPushButton;
    customBtn->setText(tr("用户自定义消息对话框实例"));
    label = new QLabel;
    label->setFrameStyle(QFrame::Panel|QFrame::Sunken);

    mainLayOut->addWidget(customBtn,4,0);
    mainLayOut->addWidget(label,4,1);
    connect(customBtn,SIGNAL(clicked()),this,SLOT(showCustomDlg()));
}