QT文件对话框、QT色彩选择对话框、QT字体选择对话框

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include<QPushButton>
#include<QLineEdit>
#include<QFileDialog>
#include<QGridLayout>
#include<QDialog>
class MyDialog : public QDialog
{
    Q_OBJECT
public:
    MyDialog(QWidget *parent = 0);

private slots:
    void showFile();
    void showColor();
    void showFont();
private:
    //文件
    QPushButton *fileButton;
    QLineEdit *fileLineEdit;
    QGridLayout *layout;
    //色彩
    QPushButton *colorButton;
    QFrame *colorFrame;
    //字体
    QPushButton *fontButton;
    QLineEdit *fontEdit;
};

#endif // DIALOG_H

dialog.cpp

#include "dialog.h"
#include<QApplication>
#include<QFileDialog>
#include<QGridLayout>
#include<QDialog>
#include<QColorDialog>
#include<QFontDialog>