19.QT对话框(文件对话框,颜色对话框,字体框,自定义对话框)

• 文件对话框

  #include<QFileDialog>

   //文件对话框
   void Dialog::on_pushButton_clicked()
   {
       //定义显示文件的类型                                 窗口标题              可供选择的类型
       QString qstr = QFileDialog::getOpenFileName(this,"这是窗口标题","/"," (*.wmv)::(*.cpp) ");
       //QString qstr = QFileDialog::getOpenFileName(this,"*.*");
       ui->lineEdit->setText(qstr);
   }

• 颜色对话框

  #include <QColorDialog>

   void Dialog::on_pushButton_2_clicked()
   {
       QColor cl = QColorDialog::getColor(Qt::yellow);
       QPalette pale(cl);//颜色的载体
  
       this->setPalette(pale);
   }

• 字体对话框

  #include <QFontDialog>

   void Dialog::on_pushButton_3_clicked()
   {
       bool isok;
       QFont qf = QFontDialog::getFont(&isok);
       if(isok)
       {
           ui->label->setFont(qf);
       }
   }

• 显示提示对话框

  #include <QMessageBox>

   void Dialog::on_pushButton_4_clicked()
   {
   //    QMessageBox *cs = new QMessageBox;
   //    cs->show();
  
       QMessageBox::warning(this,"hello1","hello2");
  
   }

• 显示自定义对话框

添加新的ui ,创建ui然后传递数据

 void Dialog::on_pushButton_5_clicked()
 {
     Newdialog *p = new Newdialog;
     //设置模态
     p->setModal(true);
     //显示
     p->show();
     //中断
     p->exec();
     ui->label->setText(p->str);
     delete p;
 }

• newdialog.h

   #ifndef NEWDIALOG_H
   #define NEWDIALOG_H
  
   #include <QDialog>
  
   namespace Ui {
   class Newdialog;
   }
  
   class Newdialog : public QDialog
   {
       Q_OBJECT
  
   public:
       explicit Newdialog(QWidget *parent = );
       ~Newdialog();
       QString str;
  
   private slots:
       void on_pushButton_clicked();
  
   private:
       Ui::Newdialog *ui;
   };
  
   #endif // NEWDIALOG_H

• newdialog.cpp

   #include "newdialog.h"
   #include "ui_newdialog.h"
   #include <QDebug>
  
   Newdialog::Newdialog(QWidget *parent) :
       QDialog(parent),
       ui(new Ui::Newdialog)
   {
       ui->setupUi(this);
   }
  
   Newdialog::~Newdialog()
   {
       delete ui;
   }
  
   void Newdialog::on_pushButton_clicked()
   {
       this->str = ui->lineEdit2->text();
       qDebug() << str << endl;
       this->close();
   }