文章目錄

Qt中的各種對話框應用

通過一個實例來介紹Qt5中對於各類對話框的應用。這個實例中具有以下這幾種QT的標準對話框：

標準文件對話框（QFileDialog）
標準顏色對話框（QColorDialog）
標準字體對話框（QFontDialog）
標準輸入對話框（QInputDialog）
標準消息對話框（QMessageDialog）

各種基本對話框都是通過調用各自不同的靜態函數來完成其功能。具體如下：

相關類	類說明	靜態函數	函數說明
QFileDialog類	標準文件對話框	getOpenFileName	獲得用戶選擇的文件名
–	–	getSaveFileName	獲得用戶保存的文件名
–	–	getExistingDirectory	獲得用戶選擇的已存在的目錄名
–	–	getOpenFileNames	獲得用戶選擇的文件名列表
QColorDialog類	標準顏色對話框	getColor	獲得用戶選擇的顏色值
QFontDialog類	標準字體對話框	getFont	獲得用戶選擇的字體
QInputDialog類	標準輸入對話框	getText	標準字符串輸入對話框
–	–	getItem	下拉表條目輸入框
–	–	getInt	int類型數據輸入對話框
–	–	getDouble	double類型數據輸入對話框
QMessageBox類	消息對話框	QMessageBox::question	question消息框
–	–	QMessageBox::information	information消息框
–	–	QMessageBox::warning	warning消息框
–	–	QMessageBox::critical	critical消息框
–	–	QMessageBox::about	about消息框
–	–	QMessageBox::aboutQt	about Qt消息框

各個靜態函數詳細說明

標準文件對話框QFileDialog::getOpenFileName()

    static QString getOpenFileName(QWidget *parent = nullptr,	//標準文件對話框的父窗口
                                   const QString &caption = QString(),	//標準文件對話框的標題名
                                   const QString &dir = QString(),	//指定默認目錄
                                   const QString &filter = QString(),//制定對文件類型的過濾
                                   QString *selectedFilter = nullptr,//用戶選擇的過濾器通過此函數返回
                                   Options options = Options());//選擇顯示文件名的個數，默認是同時是目錄與文件名

void Dialog::showFile()
{
    //設置標準文件對話框
    QString s = QFileDialog::getOpenFileName(this, "open file dialog", "/", "C++ files(*.cpp);;C files(*.c);;Head files(*.h)");
    fileLineEdit->setText(s);
}

標準顏色對話框QColor::getColor()

    static QColor getColor(const QColor &initial = Qt::white,	//默認選中的顏色
                           QWidget *parent = nullptr,	//對話框的父窗口
                           const QString &title = QString(),	//對話框的標題名
                           ColorDialogOptions options = ColorDialogOptions());

void Dialog::showColor()
{
    //設置標準顏色對話框
    QColor c = QColorDialog::getColor(Qt::blue);
    if(c.isValid())
    {
        colorFrame->setPalette(QPalette(c));
    }
}

標準字體對話框QFontDialog::getFont()

    static QFont getFont(bool *ok, //若用戶選擇“ok”則該參數爲true，函數返回所選擇的字體。否則設爲false，返回默認字體。
    					QWidget *parent = nullptr);//父窗口

void Dialog::showFont()
{
    //設置標準字體對話框
    bool ok;
    QFont f = QFontDialog::getFont(&ok);
    if(ok)
    {
        fontLineEdit->setFont(f);
    }
}

標準輸入對話框類：標準字符串輸入對話框QInputDialog::getText()

    static QString getText(QWidget *parent, //父窗口
    						const QString &title, //標題名
    						const QString &label,//標籤提示
                           QLineEdit::EchoMode echo = QLineEdit::Normal,//指定輸入對話框中的QLineEdit控件輸入模式
                           const QString &text = QString(), //制定QLineEdit控件出現的文字
                           bool *ok = nullptr,//用戶選中“ok”則返回true，否則爲false
                           Qt::WindowFlags flags = Qt::WindowFlags(),
                           Qt::InputMethodHints inputMethodHints = Qt::ImhNone);

void InputDlg::ChangeName()
{
    //標準字符串輸入對話框
    bool ok;
    QString text = QInputDialog::getText(this, tr("標準字符串輸入對話框"), tr("請輸入姓名："), QLineEdit::Normal, nameLabel2->text(), &ok);
    if(ok && !text.isEmpty())
    {
        nameLabel2->setText(text);
    }

}

標準輸入對話框類：標準條目選擇對話框QInputDialog::getItem()

    static QString getItem(QWidget *parent, //父窗口
    						const QString &title, //對話框標題名
    						const QString &label,//標籤提示
                           const QStringList &items, //指定控件顯示的可選條目爲一個QStringList對象
                           int current = 0, //對話框彈出時默認顯示的條目序號。
                           bool editable = true,//指定控件中顯示的文字是否可編輯
                           bool *ok = nullptr, //提示按鈕觸發，如果是ok按鈕則爲true，否則爲false。
                           Qt::WindowFlags flags = Qt::WindowFlags(),//指明窗口標識。
                           Qt::InputMethodHints inputMethodHints = Qt::ImhNone);

void InputDlg::ChangeSex()
{
    //標準條目選擇對話框
    QStringList SexItems;
    SexItems << tr("男") << tr("女");
    bool ok;
    QString SexItem = QInputDialog::getItem(this, tr("標準條目選擇對話框"), tr("請選擇性別："), SexItems, 0, false, &ok);
    if(ok && !SexItem.isEmpty())
    {
        sexLabel2->setText(SexItem);
    }
}

標準輸入對話框類：標準int類型輸入對話框QInputDialog::getInt()

    static int getInt(QWidget *parent, //父窗口
    					const QString &title, 標題
    					const QString &label, 標籤提示
    					int value = 0,//默認顯示值
                      int minValue = -2147483647, //數值範圍最小值
                      int maxValue = 2147483647,//數值範圍最大值
                      int step = 1, //指定控件步進值
                      bool *ok = nullptr, //提示按鈕觸發情況反饋
                      Qt::WindowFlags flags = Qt::WindowFlags());

void InputDlg::ChangeAge()
{
    //標準int類型輸入對話框
    bool ok;
    int age = QInputDialog::getInt(this, tr("標準int類型輸入對話框"), tr("請輸入年齡："), ageLabel2->text().toInt(&ok), 0, 100, 1, &ok);
    if(ok)
    {
        ageLabel2->setText(QString(tr("%1")).arg(age));
    }
}

標準輸入對話框類：標準double類型輸入對話框QInputDialog::getDouble()

    static double getDouble(QWidget *parent, 
    						const QString &title, 
    						const QString &label, 
    						double value = 0,
                            double minValue = -2147483647, 
                            double maxValue = 2147483647,
                            int decimals = 1, 
                            bool *ok = nullptr, 
                            Qt::WindowFlags flags = Qt::WindowFlags());
                            
void InputDlg::ChangeScore()
{
    //標準double類型輸入對話框
    bool ok;
    double score = QInputDialog::getDouble(this, tr("標準double類型輸入對話框"), tr("請輸入成績："), scoreLabel2->text().toDouble(&ok), 0, 100, 1, &ok);
    if(ok)
    {
        scoreLabel2->setText(QString(tr("%1")).arg(score));
    }
}

消息對話框：question消息框QMessageBox::question()

    static int question(QWidget *parent, 
    					const QString &title,
                        const QString& text,
                        int button0, 
                        int button1 = 0, 
                        int button2 = 0);

void MsgBoxDlg::showQuestionMsg()
{
    //question消息對話框
    label->setText(tr("question message box"));
    switch (QMessageBox::question(this, tr("question消息框"), tr("您現在已經修改完成，是否結束程序"), QMessageBox::Ok | QMessageBox::Cancel, QMessageBox::Ok)) {
    case QMessageBox::Ok:
        label->setText("Question button/OK");
        break;
    case QMessageBox::Cancel:
        label->setText("Question button/Cancel");
        break;
    default:
        break;
    }
    return ;
}

消息對話框：information消息框QMessageBox::information()

    static int information(QWidget *parent, 
    						const QString &title,
                           const QString& text,
                           int button0, 
                           int button1 = 0, 
                           int button2 = 0);

void MsgBoxDlg::showInformationMsg()
{
    //information消息框
    label->setText(tr("Information Message Box"));
    QMessageBox::information(this, tr("information消息框"), tr("這個information消息框測試，歡迎您！"));
    return ;
}

消息對話框：warning消息框QMessageBox::warning()

    static int warning(QWidget *parent, 
    					const QString &title,
                       const QString& text,
                       int button0, 
                       int button1, 
                       int button2 = 0);

void MsgBoxDlg::showWarningMsg()
{
    //warning消息框
    label->setText(tr("warning message box"));
    switch (QMessageBox::warning(this, tr("warning消息框"), tr("您修改的內容還未保存，是否要保存對文檔的修改？"), QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel, QMessageBox::Save)) {
    case QMessageBox::Save:
        label->setText("Warning button/Save");
        break;
    case QMessageBox::Discard:
        label->setText("Warning button/Discard");
        break;
    case QMessageBox::Cancel:
        label->setText("Warning button/Cancel");
        break;
    default:
        break;
    }
    return ;
}

消息對話框：critical消息框QMessageBox::critical()

    static int critical(QWidget *parent, 
    					const QString &title,
                        const QString& text,
                        int button0, 
                        int button1, 
                        int button2 = 0);


void MsgBoxDlg::showCriticalMsg()
{
    //critical消息框
    label->setText(tr("critical message box"));
    QMessageBox::critical(this, tr("critical消息框"), tr("這是一個critical消息框測試！"));
    return ;
}

消息對話框：about消息框QMessageBox::about()

    static void about(QWidget *parent, //父窗口
    					const QString &title, //對話框標題
    					const QString &text);//標籤提示字符串

void MsgBoxDlg::showAboutMsg()
{
    //about消息框
    label->setText(tr("about message box"));
    QMessageBox::about(this, tr("about消息框"), tr("這是一個about消息框測試！"));
    return ;
}

消息對話框：aboutQt消息框QMessageBox::aboutQt()

    static void aboutQt(QWidget *parent, 
    					const QString &title = QString());

void MsgBoxDlg::showAboutQtMsg()
{
    //about Qt消息框
    label->setText(tr("about message box"));
    QMessageBox::aboutQt(this, tr("about Qt消息框"));
    return ;
}

實例實現

新建Qt項目“DialogExample”，基類選擇“QDialog”，類名不變，取消“創建界面”複選框。

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QFileDialog>
#include <QColorDialog>
#include <QFontDialog>
#include <QMessageBox>

#include <QPushButton>
#include <QLineEdit>
#include <QGridLayout>
#include <QFrame>
#include "inputdlg.h"
#include "msgboxdlg.h"


class Dialog : public QDialog
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = nullptr);
    ~Dialog();

private slots:
    //標準文件對話框槽函數
    void showFile();
    //標準顏色對話框槽函數
    void showColor();
    //標準字體對話框槽函數
    void showFont();
    //標準輸入對話框槽函數
    void showInputDlg();
    //各種消息對話框槽函數
    void showMsgDlg();
    //自定義消息對話框槽函數
    void showCustomDlg();

private:
    //主體佈局
    QGridLayout *mainLayout;

    //標準文件對話框
    QPushButton *fileBtn;
    QLineEdit *fileLineEdit;

    //標準顏色對話框
    QPushButton *colorBtn;
    QFrame *colorFrame;

    //標準字體對話框
    QPushButton *fontBtn;
    QLineEdit *fontLineEdit;

    //標準輸入對話框
    InputDlg *inputDlg;
    QPushButton *inputBtn;

    //各種消息對話框
    QPushButton *MsgBtn;
    MsgBoxDlg *msgDlg;

    //自定義消息框
    QPushButton *CustomBtn;
    QLabel *label;


};
#endif // DIALOG_H

dialog.cpp

#include "dialog.h"

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    //設置窗口標題
    setWindowTitle(tr("各種標準對話框實例"));

    //標準文件對話框
    fileBtn = new QPushButton(tr("文件標準對話框實例"));
    fileLineEdit = new QLineEdit;

    //標準延時對話框
    colorBtn = new QPushButton(tr("標準顏色對話框實例"));
    colorFrame = new QFrame;
    colorFrame->setFrameShape(QFrame::Box);
    //改變背景顏色
    colorFrame->setAutoFillBackground(true);

    //標準字體對話框
    fontBtn = new QPushButton(tr("標準字體對話框實例"));
    fontLineEdit = new QLineEdit;
    fontLineEdit->setText(tr("Welcome!"));

    //標準輸入對話框
    inputBtn = new QPushButton(tr("標準輸入對話框實例"));

    //各種消息對話框
    MsgBtn = new QPushButton(tr("標準消息對話框實例"));

    //自定義消息對話框
    CustomBtn = new QPushButton(tr("自定義消息對話框實例"));
    label = new QLabel;
    label->setFrameStyle(QFrame::Panel | QFrame::Sunken);

    //主體佈局
    mainLayout = new QGridLayout(this);
    mainLayout->addWidget(fileBtn, 0, 0);
    mainLayout->addWidget(fileLineEdit, 0, 1);

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

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

    mainLayout->addWidget(inputBtn, 3, 0);
    mainLayout->addWidget(MsgBtn, 3, 1);

    mainLayout->addWidget(CustomBtn, 4, 0);
    mainLayout->addWidget(label, 4, 1);


    //實現槽函數鏈接
    connect(fileBtn, SIGNAL(clicked()), this, SLOT(showFile()));
    connect(colorBtn, SIGNAL(clicked()), this, SLOT(showColor()));
    connect(fontBtn, SIGNAL(clicked()), this, SLOT(showFont()));
    connect(inputBtn, SIGNAL(clicked()), this, SLOT(showInputDlg()));
    connect(MsgBtn, SIGNAL(clicked()), this, SLOT(showMsgDlg()));
    connect(CustomBtn, SIGNAL(clicked()), this, SLOT(showCustomDlg()));

}

Dialog::~Dialog()
{
}

void Dialog::showFile()
{
    //設置標準文件對話框
    QString s = QFileDialog::getOpenFileName(this, "open file dialog", "/", "C++ files(*.cpp);;C files(*.c);;Head files(*.h)");
    fileLineEdit->setText(s);
}

void Dialog::showColor()
{
    //設置標準顏色對話框
    QColor c = QColorDialog::getColor(Qt::blue);
    if(c.isValid())
    {
        colorFrame->setPalette(QPalette(c));
    }
}

void Dialog::showFont()
{
    //設置標準字體對話框
    bool ok;
    QFont f = QFontDialog::getFont(&ok);
    if(ok)
    {
        fontLineEdit->setFont(f);
    }
}

void Dialog::showInputDlg()
{
    inputDlg = new InputDlg(this);
    inputDlg->show();
}

void Dialog::showMsgDlg()
{
    msgDlg = new MsgBoxDlg(this);
    msgDlg->show();
}

void Dialog::showCustomDlg()
{
    label->setText(tr("Custom Message Box"));
    QMessageBox customMsgBox;
    customMsgBox.setWindowTitle(tr("用戶自定義消息對話框"));
    QPushButton *yesBtn = customMsgBox.addButton(tr("Yes"), QMessageBox::ActionRole);
    QPushButton *noBtn = customMsgBox.addButton(tr("No"), QMessageBox::ActionRole);
    QPushButton *cancelBtn = customMsgBox.addButton(tr("Cancel"), QMessageBox::ActionRole);

    customMsgBox.setText(tr("這是一個用戶自定義消息對話框!"));
    customMsgBox.setIconPixmap(QPixmap("Qt.png"));
    customMsgBox.exec();

    if(customMsgBox.clickedButton() == yesBtn)
        label->setText(tr("Custom message Box/yes"));
    if(customMsgBox.clickedButton() == noBtn)
        label->setText(tr("Custom message Box/no"));
    if(customMsgBox.clickedButton() == cancelBtn)
        label->setText(tr("Custom message Box/cancel"));
    return ;
}

添加標準輸入對話框的各項實例，添加新文件->C++類，命令爲InpuDlg，繼承自QDialog類，具體代碼如下：
inputdlg.h

#ifndef INPUTDLG_H
#define INPUTDLG_H

#include <QDialog>
#include <QPushButton>
#include <QGridLayout>
#include <QLabel>
#include <QInputDialog>

class InputDlg : public QDialog
{
    Q_OBJECT
public:
    InputDlg(QWidget *parent = 0);

private slots:
    void ChangeName();
    void ChangeSex();
    void ChangeAge();
    void ChangeScore();
private:
    QLabel *nameLabel1;
    QLabel *sexLabel1;
    QLabel *ageLabel1;
    QLabel *scoreLabel1;
    QLabel *nameLabel2;
    QLabel *sexLabel2;
    QLabel *ageLabel2;
    QLabel *scoreLabel2;
    QPushButton *nameBtn;
    QPushButton *sexBtn;
    QPushButton *ageBtn;
    QPushButton *scoreBtn;
    QGridLayout *mainLayout;
};

#endif // INPUTDLG_H

inputdlg.cpp

#include "dialog.h"

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    //設置窗口標題
    setWindowTitle(tr("各種標準對話框實例"));

    //標準文件對話框
    fileBtn = new QPushButton(tr("文件標準對話框實例"));
    fileLineEdit = new QLineEdit;

    //標準延時對話框
    colorBtn = new QPushButton(tr("標準顏色對話框實例"));
    colorFrame = new QFrame;
    colorFrame->setFrameShape(QFrame::Box);
    //改變背景顏色
    colorFrame->setAutoFillBackground(true);

    //標準字體對話框
    fontBtn = new QPushButton(tr("標準字體對話框實例"));
    fontLineEdit = new QLineEdit;
    fontLineEdit->setText(tr("Welcome!"));

    //標準輸入對話框
    inputBtn = new QPushButton(tr("標準輸入對話框實例"));

    //各種消息對話框
    MsgBtn = new QPushButton(tr("標準消息對話框實例"));

    //自定義消息對話框
    CustomBtn = new QPushButton(tr("自定義消息對話框實例"));
    label = new QLabel;
    label->setFrameStyle(QFrame::Panel | QFrame::Sunken);

    //主體佈局
    mainLayout = new QGridLayout(this);
    mainLayout->addWidget(fileBtn, 0, 0);
    mainLayout->addWidget(fileLineEdit, 0, 1);

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

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

    mainLayout->addWidget(inputBtn, 3, 0);
    mainLayout->addWidget(MsgBtn, 3, 1);

    mainLayout->addWidget(CustomBtn, 4, 0);
    mainLayout->addWidget(label, 4, 1);


    //實現槽函數鏈接
    connect(fileBtn, SIGNAL(clicked()), this, SLOT(showFile()));
    connect(colorBtn, SIGNAL(clicked()), this, SLOT(showColor()));
    connect(fontBtn, SIGNAL(clicked()), this, SLOT(showFont()));
    connect(inputBtn, SIGNAL(clicked()), this, SLOT(showInputDlg()));
    connect(MsgBtn, SIGNAL(clicked()), this, SLOT(showMsgDlg()));
    connect(CustomBtn, SIGNAL(clicked()), this, SLOT(showCustomDlg()));

}

Dialog::~Dialog()
{
}

void Dialog::showFile()
{
    //設置標準文件對話框
    QString s = QFileDialog::getOpenFileName(this, "open file dialog", "/", "C++ files(*.cpp);;C files(*.c);;Head files(*.h)");
    fileLineEdit->setText(s);
}

void Dialog::showColor()
{
    //設置標準顏色對話框
    QColor c = QColorDialog::getColor(Qt::blue);
    if(c.isValid())
    {
        colorFrame->setPalette(QPalette(c));
    }
}

void Dialog::showFont()
{
    //設置標準字體對話框
    bool ok;
    QFont f = QFontDialog::getFont(&ok);
    if(ok)
    {
        fontLineEdit->setFont(f);
    }
}

void Dialog::showInputDlg()
{
    inputDlg = new InputDlg(this);
    inputDlg->show();
}

void Dialog::showMsgDlg()
{
    msgDlg = new MsgBoxDlg(this);
    msgDlg->show();
}

void Dialog::showCustomDlg()
{
    label->setText(tr("Custom Message Box"));
    QMessageBox customMsgBox;
    customMsgBox.setWindowTitle(tr("用戶自定義消息對話框"));
    QPushButton *yesBtn = customMsgBox.addButton(tr("Yes"), QMessageBox::ActionRole);
    QPushButton *noBtn = customMsgBox.addButton(tr("No"), QMessageBox::ActionRole);
    QPushButton *cancelBtn = customMsgBox.addButton(tr("Cancel"), QMessageBox::ActionRole);

    customMsgBox.setText(tr("這是一個用戶自定義消息對話框!"));
    customMsgBox.setIconPixmap(QPixmap("Qt.png"));
    customMsgBox.exec();

    if(customMsgBox.clickedButton() == yesBtn)
        label->setText(tr("Custom message Box/yes"));
    if(customMsgBox.clickedButton() == noBtn)
        label->setText(tr("Custom message Box/no"));
    if(customMsgBox.clickedButton() == cancelBtn)
        label->setText(tr("Custom message Box/cancel"));
    return ;
}

最後添加消息對話框類的各項示例，添加新文件->選擇C++類->命令爲MsgBoxDlg，同樣選擇繼承自QDialog，具體代碼如下：
msgboxdlg.h

#ifndef MSGBOXDLG_H
#define MSGBOXDLG_H

#include <QDialog>
#include <QWidget>
#include <QLabel>
#include <QPushButton>
#include <QGridLayout>
#include <QMessageBox>


class MsgBoxDlg : public QDialog
{
    Q_OBJECT
public:
    MsgBoxDlg(QWidget *parent = 0);

private slots:
    void showQuestionMsg();
    void showInformationMsg();
    void showWarningMsg();
    void showCriticalMsg();
    void showAboutMsg();
    void showAboutQtMsg();

private:
    QLabel *label;
    QPushButton *questionBtn;
    QPushButton *informationBtn;
    QPushButton *warningBtn;
    QPushButton *criticalBtn;
    QPushButton *aboutBtn;
    QPushButton *aboutQtBtn;
    QGridLayout *mainLayout;

};

#endif // MSGBOXDLG_H

msgboxdlg.cpp

#include "msgboxdlg.h"

MsgBoxDlg::MsgBoxDlg(QWidget *parent)
{
    setWindowTitle(tr("標準對話框實例"));
    label = new QLabel(tr("請選擇一種消息框"));
    questionBtn = new QPushButton(tr("QusetionMsg"));
    informationBtn = new QPushButton(tr("InformationMsg"));
    warningBtn = new QPushButton(tr("warningMsg"));
    criticalBtn = new QPushButton(tr("criticalMsg"));
    aboutBtn = new QPushButton(tr("aboutMsg"));
    aboutQtBtn = new QPushButton(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()
{
    //question消息對話框
    label->setText(tr("question message box"));
    switch (QMessageBox::question(this, tr("question消息框"), tr("您現在已經修改完成，是否結束程序"), QMessageBox::Ok | QMessageBox::Cancel, QMessageBox::Ok)) {
    case QMessageBox::Ok:
        label->setText("Question button/OK");
        break;
    case QMessageBox::Cancel:
        label->setText("Question button/Cancel");
        break;
    default:
        break;
    }
    return ;
}

void MsgBoxDlg::showInformationMsg()
{
    //information消息框
    label->setText(tr("Information Message Box"));
    QMessageBox::information(this, tr("information消息框"), tr("這個information消息框測試，歡迎您！"));
    return ;
}

void MsgBoxDlg::showWarningMsg()
{
    //warning消息框
    label->setText(tr("warning message box"));
    switch (QMessageBox::warning(this, tr("warning消息框"), tr("您修改的內容還未保存，是否要保存對文檔的修改？"), QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel, QMessageBox::Save)) {
    case QMessageBox::Save:
        label->setText("Warning button/Save");
        break;
    case QMessageBox::Discard:
        label->setText("Warning button/Discard");
        break;
    case QMessageBox::Cancel:
        label->setText("Warning button/Cancel");
        break;
    default:
        break;
    }
    return ;
}

void MsgBoxDlg::showCriticalMsg()
{
    //critical消息框
    label->setText(tr("critical message box"));
    QMessageBox::critical(this, tr("critical消息框"), tr("這是一個critical消息框測試！"));
    return ;
}

void MsgBoxDlg::showAboutMsg()
{
    //about消息框
    label->setText(tr("about message box"));
    QMessageBox::about(this, tr("about消息框"), tr("這是一個about消息框測試！"));
    return ;
}

void MsgBoxDlg::showAboutQtMsg()
{
    //about Qt消息框
    label->setText(tr("about message box"));
    QMessageBox::aboutQt(this, tr("about Qt消息框"));
    return ;
}

最終實現：
主界面

標準輸入對話框界面
標準消息對話框界面
自定義消息對話框

工具盒類

工具盒類又稱爲QToolBox，QToolBox提供了一種列狀的層疊窗體，並且提供了一種快速訪問命令或選擇項的按鈕，通常在工具條中使用。
抽屜效果是軟件界面設計中的一種常用形式，可以以一種動態直觀的方式在大小有限的界面上擴展出更多的功能。

示例“qq界面實例”

通過實現類似QQ抽屜效果的實例來介紹QToolBox類的使用。

實現步驟

新建Qt widget application，項目名稱爲“MyQQExample”，基類選擇“QDialog”，取消“創建界面”複選框選擇。
在項目上點右鍵添加新文件，選擇“C++Class”選項，基類選擇‘QToolBox’，輸入類名稱爲“Drawer”。
在drawer.h中添加以下代碼

#ifndef DRAWER_H
#define DRAWER_H

#include <QObject>
#include <QToolBox>
#include <QToolButton>
#include <QGroupBox>
#include <QVBoxLayout>

class Drawer : public QToolBox
{
public:
    Drawer(QWidget *parent = 0, Qt::WindowFlags f = 0);

private:
    QToolButton *toolBtn1_1;
    QToolButton *toolBtn1_2;
    QToolButton *toolBtn1_3;
    QToolButton *toolBtn1_4;
    QToolButton *toolBtn1_5;

    QToolButton *toolBtn2_1;
    QToolButton *toolBtn2_2;

    QToolButton *toolBtn3_1;
    QToolButton *toolBtn3_2;

};

#endif // DRAWER_H

在drawer.cpp中添加以下代碼

#include "drawer.h"

Drawer::Drawer(QWidget *parent, Qt::WindowFlags f)
{
    //設置主窗口標題
    setWindowTitle(tr("My QQ"));

    toolBtn1_1 = new QToolButton;
    toolBtn1_1->setText(tr("張三"));
    toolBtn1_1->setIcon(QPixmap("11.png"));
    toolBtn1_1->setIconSize(QPixmap("11.png").size());
    toolBtn1_1->setAutoRaise(true);
    toolBtn1_1->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);

    toolBtn1_2 = new QToolButton;
    toolBtn1_2->setText(tr("李四"));
    toolBtn1_2->setIcon(QPixmap("12.png"));
    toolBtn1_2->setIconSize(QPixmap("12.png").size());
    toolBtn1_2->setAutoRaise(true);
    toolBtn1_2->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);

    toolBtn1_3 = new QToolButton;
    toolBtn1_3->setText(tr("王五"));
    toolBtn1_3->setIcon(QPixmap("13.png"));
    toolBtn1_3->setIconSize(QPixmap("13.png").size());
    toolBtn1_3->setAutoRaise(true);
    toolBtn1_3->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);

    toolBtn1_4 = new QToolButton;
    toolBtn1_4->setText(tr("小孫"));
    toolBtn1_4->setIcon(QPixmap("14.png"));
    toolBtn1_4->setIconSize(QPixmap("14.png").size());
    toolBtn1_4->setAutoRaise(true);
    toolBtn1_4->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);

    toolBtn1_5 = new QToolButton;
    toolBtn1_5->setText(tr("小趙"));
    toolBtn1_5->setIcon(QPixmap("15.png"));
    toolBtn1_5->setIconSize(QPixmap("15.png").size());
    toolBtn1_5->setAutoRaise(true);
    toolBtn1_5->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);

    QGroupBox *groupBox1 = new QGroupBox;
    QVBoxLayout *layout1 = new QVBoxLayout(groupBox1);

    //佈局中各窗體的顯示間距
    layout1->setMargin(10);
    //佈局中各窗體的顯示位置，居中
    layout1->setAlignment(Qt::AlignCenter);
    //插入各個按鈕
    layout1->addWidget(toolBtn1_1);
    layout1->addWidget(toolBtn1_2);
    layout1->addWidget(toolBtn1_3);
    layout1->addWidget(toolBtn1_4);
    layout1->addWidget(toolBtn1_5);

    //插入一個佔位符
    layout1->addStretch();

    toolBtn2_1 = new QToolButton;
    toolBtn2_1->setText(tr("小王"));
    toolBtn2_1->setIcon(QPixmap("21.png"));
    toolBtn2_1->setIconSize(QPixmap("21.png").size());
    toolBtn2_1->setAutoRaise(true);
    toolBtn2_1->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);

    toolBtn2_2 = new QToolButton;
    toolBtn2_2->setText(tr("小張"));
    toolBtn2_2->setIcon(QPixmap("22.png"));
    toolBtn2_2->setIconSize(QPixmap("22.png").size());
    toolBtn2_2->setAutoRaise(true);
    toolBtn2_2->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);

    QGroupBox *groupBox2 = new QGroupBox;
    QVBoxLayout *layout2 = new QVBoxLayout(groupBox2);
    layout2->setMargin(10);
    layout2->setAlignment(Qt::AlignCenter);
    layout2->addWidget(toolBtn2_1);
    layout2->addWidget(toolBtn2_2);

    toolBtn3_1 = new QToolButton;
    toolBtn3_1->setText(tr("小陳"));
    toolBtn3_1->setIcon(QPixmap("31.png"));
    toolBtn3_1->setIconSize(QPixmap("31.png").size());
    toolBtn3_1->setAutoRaise(true);
    toolBtn3_1->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);

    toolBtn3_1 = new QToolButton;
    toolBtn3_1->setText(tr("小李"));
    toolBtn3_1->setIcon(QPixmap("32.png"));
    toolBtn3_1->setIconSize(QPixmap("32.png").size());
    toolBtn3_1->setAutoRaise(true);
    toolBtn3_1->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);

    QGroupBox *groupBox3 = new QGroupBox;
    QVBoxLayout *layout3 = new QVBoxLayout(groupBox3);
    layout3->setMargin(10);
    layout3->setAlignment(Qt::AlignCenter);
    layout3->addWidget(toolBtn3_1);
    layout3->addWidget(toolBtn3_2);

    //將準備好的抽屜插入Toolbox中
    this->addItem((QWidget *)groupBox1, tr("我的好友"));
    this->addItem((QWidget *)groupBox2, tr("陌生人"));
    this->addItem((QWidget *)groupBox3, tr("黑名單"));

}

修改dialog.cpp中代碼

#include "dialog.h"

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    drawer = new Drawer(this);
    drawer->show();
}

Dialog::~Dialog()
{
}

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include "drawer.h"
class Dialog : public QDialog
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = nullptr);
    ~Dialog();

    Drawer *drawer;
};
#endif // DIALOG_H

Qt5——基本對話框(1)

文章目錄

Qt中的各種對話框應用

各個靜態函數詳細說明

實例實現

工具盒類

示例“qq界面實例”

實現步驟

界面效果

【SQL進階】CASE語句的使用

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