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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 QDialog15 {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.html15     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 }