QT 自定义模态对话框

新建一个MsgBox类

msgbox.h 代码

#ifndef MSGBOX_H
#define MSGBOX_H

#include <QDialog>
#include <QPushButton>
#include <QLabel>
#include <QMouseEvent>
#include <QFont>
#include <QPixmap>
#include <QPainter>
#include<QBitmap>

class MsgBox : public QDialog
{
    Q_OBJECT

public:
    MsgBox(QWidget *parent = );
    ~MsgBox();

public:
    QPushButton *ok_button;
    QPushButton *close_button;
    QPushButton *cancel_button;
    QLabel *ask_label;
    QLabel *msg_label;
    QLabel *title_label;
    QString ok_text;
    QString cancel_text;

public:
    void setInfo(QString title_info, QString info,QPixmap pixmap, bool is_ok_hidden,QString language);
protected:
    QPoint move_point;
    bool mouse_press;

    void paintEvent(QPaintEvent *);
    void mousePressEvent( QMouseEvent * event );
    void mouseReleaseEvent( QMouseEvent *);
    void mouseMoveEvent(QMouseEvent *event);
public slots:
    void okOperate();
    void cancelOperate();
    void closeOperate();
};

#endif // MSGBOX_H

msgbox.cpp 代码

#include "msgbox.h"

MsgBox::MsgBox(QWidget *parent)
    : QDialog(parent)
{
      this->resize(, );

      //获取主界面的宽度
      int width = this->width();
      int height = this->height();

      //初始化为未按下鼠标左键
      mouse_press = false;

      //设置标题栏隐藏
      this->setWindowFlags(Qt::FramelessWindowHint | Qt::Dialog);

      close_button = new QPushButton(this);

      //close_button->loadPixmap(":/image/images/bg.png");
      close_button->setGeometry(width-,, , );
      close_button->setStyleSheet("border-image:url(:/image/images/closeBtn.png);");

      //设置标题
      title_label = new QLabel(this);
      title_label->setObjectName(QString::fromUtf8("labelOne"));
      QFont font = title_label->font();
      font.setBold(true);
      title_label->setFont(font);
      title_label->setGeometry(, , width-, );

      //设置提示图片
      msg_label = new QLabel(this);
      msg_label->setGeometry(, , , );
      msg_label->setScaledContents(true);

      //设置提示信息，让QLabel能够自动判断并换行显示：
      ask_label = new QLabel(this);
      ask_label->setGeometry(, , width-, *);
      ask_label->setWordWrap(true);
      ask_label->setAlignment(Qt::AlignTop);

      cancel_button = new QPushButton(this);
      cancel_button->resize(, );
      cancel_button->move(width - cancel_button->width() - , height - );

      ok_button = new QPushButton(this);
      ok_button->resize(, );
      ok_button->move(width - ok_button->width() - cancel_button->width() - , height - );

      ok_button->setObjectName(QString::fromUtf8("pushButtonTwo"));
      cancel_button->setObjectName(QString::fromUtf8("pushButtonTwo"));

      QObject::connect(ok_button, SIGNAL(clicked()), this, SLOT(okOperate()));
      QObject::connect(close_button, SIGNAL(clicked()), this, SLOT(closeOperate()));
      QObject::connect(cancel_button, SIGNAL(clicked()), this, SLOT(cancelOperate()));
}

MsgBox::~MsgBox()
{

}

//设置对话框信息
void MsgBox::setInfo(QString title_info, QString info,QPixmap pixmap,bool is_ok_hidden,QString language)
{
  title_label->setText(QString("  ") + title_info);

  //设置提示信息
  ask_label->setText(info);
  msg_label->setPixmap(pixmap);

  //是否隐藏确定按钮
  ok_button->setHidden(is_ok_hidden);
  if(is_ok_hidden)
  {
      if(language == "中文")
      {
          cancel_button->setText(tr("确定"));
      }
      else if(language == "英文")
      {
          cancel_button->setText(tr("OK"));
      }
      else if(language == "泰文")
      {
          cancel_button->setText(tr("แน่ใจว่า"));
      }
  }
  else
  {
      if(language == "中文")
      {
          ok_button->setText(tr("确定"));
          cancel_button->setText(tr("取消"));
      }
      else if(language == "英文")
      {
          ok_button->setText(tr("OK"));
          cancel_button->setText(tr("Cancel"));
      }
      else if(language == "泰文")
      {
          ok_button->setText(tr("แน่ใจว่า"));
          cancel_button->setText(tr("การยกเลิก"));
      }
  }

  //设置默认按钮为取消按钮
  cancel_button->setFocus();
}

void MsgBox::paintEvent(QPaintEvent *)
{
  QPainter painter(this);
  painter.drawPixmap(rect(), QPixmap(":/image/images/close.png"));

  QBitmap bitmap(this->size());
  QPainter painter2(&bitmap);
  painter2.fillRect(bitmap.rect(), Qt::white);
  painter2.setBrush(QColor(, , ));
  painter2.drawRoundedRect(rect(), , );
  setMask(bitmap);
}

void MsgBox::mousePressEvent( QMouseEvent * event )
{
  //只能是鼠标左键移动和改变大小
  if(event->button() == Qt::LeftButton)
  {
    mouse_press = true;
  }

  //窗口移动距离
  move_point = event->globalPos() - pos();
}

void MsgBox::mouseReleaseEvent( QMouseEvent *)
{
  mouse_press = false;
}

void MsgBox::mouseMoveEvent(QMouseEvent *event)
{
  //移动窗口
  if(mouse_press)
  {
    QPoint move_pos = event->globalPos();
    move(move_pos - move_point);
  }
}

//确认操作
void MsgBox::okOperate()
{
  this->accept();
}

//取消操作
void MsgBox::cancelOperate()
{
  this->reject();
}

//关闭窗体操作
void MsgBox::closeOperate()
{
    close();
}

主函数调用代码：

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

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

    w.setInfo(QString("提示："),QString("是否关机？"),QPixmap(":/image/images/tip.png"),false,QString("中文"));
    w.show();
    return a.exec();
}

目录构建图：

实现效果图：