Qt编程之实现在QFileDialog上添加自定义的widget

上网搜索找到的方法如下:

http://www.qtforum.org/article/20841/how-to-add-a-qwidget-in-qfiledialog.html#post78422

http://www.qtcentre.org/threads/42858-Creating-a-Custom-FileOpen-Dialog

http://stackoverflow.com/questions/16987916/add-widgets-to-qfiledialog

 

 

其实前两个链接里面提供的方法我都试了,行不通,这些方法都是直接在QFileDialog上添加widget,首先都得获得QFileDialog的layout,估计是他们用的是以前Qt的版本吧,反正5.0.0以上的版本是没有用了,用了直接程序会Abort。这个他们说了也不推荐用。因为Qt版本内部的数据结构是不断变化的。

 

所以以下我采用了一种巧妙的方式,绕过了直接在QFileDialog上添加widget,实质上是自己创建一个QDialog,把QFileDialog作为一个widget添加到QDialog里面。

 

以下是Demo:

myFileDlg.h

 1 #ifndef MY_FILE_DIALOG_H

 2 #define  MY_FILE_DIALOG_H

 3 #include <QLineEdit>

 4 #include <QDialog>

 5 /*class MyFileDialog : public QFileDialog

 6 {

 7 public:

 8     MyFileDialog(QWidget *parent);

 9 private:

10     QLineEdit *line_edit;

11     QFileDialog *p;

12 };*/

13 

14 class Dialog : public QDialog

15 {

16     

17 public:

18     Dialog(QWidget *parent = 0);

19     QFileDialog* GetFileDlg()

20     {

21         return m_filedlg;

22     }

23 

24 

25 private:

26 

27     QFileDialog *m_filedlg ;

28     QLabel *textLabel;

29     QLineEdit *textEdit ;

30 

31     QGridLayout *mainLayout ;

32 

33     QString openFilesPath;

34 

35 };

36 

37 

38 

39 

40 #endif

myFileDlg.cpp

 1 #include <QWidget>

 2 #include <QGridLayout>

 3 #include <QFileDialog>

 4 #include <assert.h>

 5 #include <QHBoxLayout>

 6 #include <QVBoxLayout>

 7 #include <QLabel>

 8 #include <QDialog>

 9 

10 #include "myFileDlg.h"

11 

12 

13 

14 Dialog::Dialog(QWidget *parent): QDialog(parent)

15 {

16 

17     /***********************************************************/

18 

19     QFileDialog *m_filedlg = new QFileDialog(this,Qt::SubWindow);

20 

21     m_filedlg->setOption(QFileDialog::DontUseNativeDialog,true);

22 

23     if(m_filedlg->testOption(QFileDialog::DontUseNativeDialog))

24         printf("cuccee\n");

25 

26 

27 

28     //m_filedlg ->getOpenFileName(0,"Select File","D:\\","Video Files (*.avi *.mpg);;3D STL Files (*.stl)",NULL,QFileDialog::DontUseNativeDialog);

29 

30     

31 

32     //m_filedlg->setWindowFlags(Qt::SubWindow) ;

33 

34     /***********************************************************/

35 

36     textLabel = new QLabel( tr(" StepX: ") );

37     textEdit  = new QLineEdit(); 

38 

39     mainLayout = new QGridLayout(this);

40 

41 

42     mainLayout->addWidget( m_filedlg , 0 , 0 , 2 , 1  ) ;

43     mainLayout->addWidget( textLabel , 2 , 0 , 1 , 1  ) ;

44     mainLayout->addWidget(textEdit ,   2 , 1 , 1 , 1  ) ;

45 

46 

47     /***********************************************************/

48 

49     //setMinimumHeight( 400 ) ;

50     //setMinimumWidth( 600 ) ;

51 

52     setSizePolicy( QSizePolicy( QSizePolicy::Expanding , QSizePolicy::Expanding )  ) ;

53 

54     setLayout(mainLayout);  

55 

56 

57 }

main.cpp

 1 #include <stdio.h>

 2 #include <QApplication>

 3 #include <QString>

 4 #include <QtCore/QtPlugin>

 5 #include <QFileDialog>

 6 #include <QLabel>

 7 #include <QLineEdit>

 8 #include <QGridLayout>

 9 #include "myFileDlg.h"

10 

11 

12 int main(int argc, char* argv[])

13 {

14     Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin);//之前上一篇文章有描述过这个问题,必须要加入这行,不然不起作用。运行时会出错,http://www.cnblogs                                                   //.com/foohack/p/3909320.html

15     QApplication app(argc,argv);

16     

17 

18     

19     

20     

21     

22     

23 

24      Dialog *dialog =new Dialog(0);

25 

26     // dlg ->getOpenFileName(0,"Select File","D:\\","Video Files (*.avi *.mpg);;3D STL Files (*.stl)",NULL);

27      dialog->setWindowTitle("Select BIG Image File");  

28      dialog->setModal(true);  

29      //dialog->show( ) ;  

30 

31      dialog->exec();

32     return app.exec();

33 

34     

35     

36 }

 

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