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 = 0);
      ~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();
  }