Qt中自定义提示框messageBox

Qt中QMessageBox消息对话框的使用

Qt中自带的对话框QMessageBox

加入头文件#include

函数名原型:static StandardButton QMessageBox::information ( QWidget * parent, const QString & title, constQString & text, StandardButtons buttons = Ok, StandardButton defaultButton = NoButton );

#有以下提示框类型:
Qmessagebox::question()
Qmessagebox::information()
Qmessagebox::warning()

#实例使用如下:
//获取返回的按钮内容
StandardButton::QMessageBox btn= QMessageBox::information(NULL, “Title”, “Content”, QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);
if(btn==QMQMessageBox::YES)
{
//执行代码内容
}
else
{
//执行代码内容
}
效果如下：

自定义提示框

为什么需要设计自定义提示框呢？
一是：Qt自带的提示框样式单一；
二是：提示框的太小；
三是：跟项目的不搭配；

代码如下：
messageBox.h

class messageBox:public QDialog
{
    Q_OBJECT
public:
    messageBox(QString title = "提示",QString text = nullptr, int showMessageType = Warning, int showBtnType = ButtonYes, QDialog *parent = nullptr);//构造函数
    ~messageBox();
    enum Icon {//图标
        // keep this in sync with QMessageDialogOptions::Icon
        Information = 1,
        Warning = 2,
        Critical = 3,
        Question = 4
    };
	//按钮选择
    enum Button{
        ButtonYes = 0,	//一个yes
        ButtonNo,		//一个no
        ButtonYesAndNo,	//有两个按钮，一个yes，一个no
        ButtonNot,		//没有按钮
    };
private:
    QString m_title;		//标题栏
    QString m_showText;		//内容
    int m_showMessageType;	//显示类型
    int m_showBtnType;		//按钮显示类型

    QLabel *titleLabel;
    QLabel *showLabel;
    QLabel *iconLabel;
    QPushButton *okBtn;
    QPushButton *quitBtn;
   // QIcon *icon;
    QHBoxLayout *titlelayout;
    QHBoxLayout *layout;
    QHBoxLayout *layout1;
    QVBoxLayout *vLayout;
    void btnStyle();
    void messageStyle();
private slots:
    void btnClick();

};

messageBox.cpp

messageBox::messageBox(QString title, QString text,int showMessageType,int showBtnType,QDialog *parent)
    : QDialog(parent),
      m_title(title),
      m_showText(text),
      m_showMessageType(showMessageType),
      m_showBtnType(showBtnType)

{
    btnStyle();
    messageStyle();
    vLayout = new QVBoxLayout;
    vLayout->addLayout(titlelayout);
    vLayout->addLayout(layout);
    vLayout->addLayout(layout1);
    vLayout->setSpacing(0);
    vLayout->setMargin(0);
    vLayout->setStretch(0,1);
    vLayout->setStretch(1,2);
    vLayout->setStretch(2,1);
    this->resize(360,200);
    this->setLayout(vLayout);
    this->show();
    connect(okBtn,SIGNAL(clicked()),this,SLOT(btnClick()));
    connect(quitBtn,SIGNAL(clicked()),this,SLOT(btnClick()));

}

按钮触发槽函数
void messageBox::btnClick()
{
QPushButton * btn = (QPushButton*)sender();
if (btn == okBtn) {
this->accept(); //返回1
} else if (btn == quitBtn) {
this->reject(); //返回0
}
}

提示框的布局

void messageBox::btnStyle()
{
    titlelayout = new QHBoxLayout;
    titleLabel = new QLabel(m_title);
    titleLabel->setAlignment(Qt::AlignCenter);
    titleLabel->setStyleSheet("background: rgbda(85,174,255,100%);color:#ffffff;");
    titlelayout->addWidget(titleLabel);
    
    okBtn = new QPushButton;
    quitBtn = new QPushButton;
    okBtn->setText(tr("确定"));
    okBtn->setFixedSize(120,50);
    okBtn->setFocusPolicy(Qt::NoFocus);
    okBtn->setStyleSheet("border-image:url(:/image/partdialog/未选中.png);color: #ffffff;");
    quitBtn->setText(tr("取消"));
    quitBtn->setFixedSize(120,50);
    quitBtn->setFocusPolicy(Qt::NoFocus);
    quitBtn->setStyleSheet("border-image:url(:/image/partdialog/未选中.png);color: #ffffff;");
    
    layout1 = new QHBoxLayout;
    if (m_showBtnType == ButtonYes) {
        layout1->addWidget(okBtn);
        layout1->setSpacing(30);
        layout1->setMargin(15);
    } else if (m_showBtnType == ButtonNo) {
        layout1->addWidget(quitBtn);
        layout1->setSpacing(30);
        layout1->setMargin(15);
    } else if (m_showBtnType == ButtonYesAndNo) {
        layout1->addWidget(okBtn);
        layout1->addWidget(quitBtn);
        layout1->setSpacing(30);
        layout1->setMargin(15);
    } else {

    }
}

结论:其实提示框的重点是套用Dialog，然后和按钮的触发机制，accept()和reject()的返回值，在主线程调用的时候if (msg.exec())判断

实用例程

下一章节：Qt 制作圆弧型提示框QDialog