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>

1 //文件对话框
2 void Dialog::on_pushButton_clicked()
3 {
4     //定义显示文件的类型                                 窗口标题              可供选择的类型
5     QString qstr = QFileDialog::getOpenFileName(this,"这是窗口标题","/"," (*.wmv)::(*.cpp) ");
6     //QString qstr = QFileDialog::getOpenFileName(this,"*.*");
7     ui->lineEdit->setText(qstr);
8 }

颜色对话框

#include <QColorDialog>

1 void Dialog::on_pushButton_2_clicked()
2 {
3     QColor cl = QColorDialog::getColor(Qt::yellow);
4     QPalette pale(cl);//颜色的载体
5 
6     this->setPalette(pale);
7 }

字体对话框

#include <QFontDialog>

1 void Dialog::on_pushButton_3_clicked()
2 {
3     bool isok;
4     QFont qf = QFontDialog::getFont(&isok);
5     if(isok)
6     {
7         ui->label->setFont(qf);
8     }
9 }

显示提示对话框

#include <QMessageBox>

1 void Dialog::on_pushButton_4_clicked()
2 {
3 //    QMessageBox *cs = new QMessageBox;
4 //    cs->show();
5 
6     QMessageBox::warning(this,"hello1","hello2");
7 
8 }

显示自定义对话框

添加新的ui ,创建ui然后传递数据

 1 void Dialog::on_pushButton_5_clicked()
 2 {
 3     Newdialog *p = new Newdialog;
 4     //设置模态
 5     p->setModal(true);
 6     //显示
 7     p->show();
 8     //中断
 9     p->exec();
10     ui->label->setText(p->str);
11     delete p;
12 }

newdialog.h

 1 #ifndef NEWDIALOG_H
 2 #define NEWDIALOG_H
 3 
 4 #include <QDialog>
 5 
 6 namespace Ui {
 7 class Newdialog;
 8 }
 9 
10 class Newdialog : public QDialog
11 {
12     Q_OBJECT
13 
14 public:
15     explicit Newdialog(QWidget *parent = 0);
16     ~Newdialog();
17     QString str;
18 
19 private slots:
20     void on_pushButton_clicked();
21 
22 private:
23     Ui::Newdialog *ui;
24 };
25 
26 #endif // NEWDIALOG_H

newdialog.cpp

 1 #include "newdialog.h"
 2 #include "ui_newdialog.h"
 3 #include <QDebug>
 4 
 5 Newdialog::Newdialog(QWidget *parent) :
 6     QDialog(parent),
 7     ui(new Ui::Newdialog)
 8 {
 9     ui->setupUi(this);
10 }
11 
12 Newdialog::~Newdialog()
13 {
14     delete ui;
15 }
16 
17 void Newdialog::on_pushButton_clicked()
18 {
19     this->str = ui->lineEdit2->text();
20     qDebug() << str << endl;
21     this->close();
22 }