This example shows how to use two other static methods in QFileDialog for the user to select a directory or file name.<\/p>\n\n\n
\n#include <QtCore>\n#include <QtGui>\n\nclass MainWindow : public QWidget\n{\n public:\n MainWindow();\n\n private:\n void setExistingDirectory();\n void setOpenFileName();\n\n QLineEdit *dir_text;\n QLineEdit *file_text;\n};\n<\/pre><\/div>\n\n\nThis declaration for MainWindow declares two slot methods and two line edit widgets which will be updated by the corresponding slot methods. <\/p>\n\n\n
\nMainWindow::MainWindow()\n{\n setMinimumSize(700, 350);\n\n QPushButton *dir_pb = new QPushButton("Directory Name");\n dir_text = new QLineEdit();\n\n QPushButton *file_pb = new QPushButton("File Name");\n file_text = new QLineEdit();\n\n QPushButton *close_pb = new QPushButton();\n close_pb->setText("Close");\n\n QGridLayout *grid1 = new QGridLayout();\n grid1->setContentsMargins(75, 45, 75, 25);\n grid1->setHorizontalSpacing(20);\n grid1->setVerticalSpacing(45);\n\n grid1->addWidget(dir_pb, 0, 0);\n grid1->addWidget(dir_text, 0, 1);\n\n grid1->addWidget(file_pb, 1, 0);\n grid1->addWidget(file_text, 1, 1);\n\n QHBoxLayout *layout1 = new QHBoxLayout();\n layout1->addStretch();\n layout1->addWidget(close_pb);\n layout1->addStretch();\n\n QVBoxLayout *layoutMain = new QVBoxLayout(this);\n layoutMain->addLayout(grid1);\n layoutMain->addSpacing(75);\n layoutMain->addLayout(layout1);\n\n connect(dir_pb, &QPushButton::clicked, \n this, &MainWindow::setExistingDirectory);\n\n connect(file_pb, &QPushButton::clicked, \n this, &MainWindow::setOpenFileName);\n\n connect(close_pb, &QPushButton::clicked, \n this, &QWidget::close);\n}\n<\/pre><\/div>\n\n\nThe setup for this code is very similar to the last few examples. The user interface will display two push buttons with two associated line edits. <\/p>\n\n\n\n
Signal \/ Slot Connections<\/h3>\n\n\n\n
Lines 36 and 39 set up what action should be taken when either the “Directory Name” or “File Name” push buttons are clicked.<\/p>\n\n\n
\nvoid MainWindow::setExistingDirectory()\n{\n QFileDialog::FileDialogOptions options = \n QFileDialog::DontResolveSymlinks | \n QFileDialog::ShowDirsOnly;\n\n QString directory = \n QFileDialog::getExistingDirectory(this,\n "Directory Name", dir_text->text(), options);\n\n if (! directory.isEmpty()) {\n dir_text->setText(directory);\n }\n}\n\nvoid MainWindow::setOpenFileName()\n{\n QString fileName = \n QFileDialog::getOpenFileName(this, \n "File Name", file_text->text(), \n "All Files (*);;Text Files (*.txt)");\n\n if (! fileName.isEmpty()) {\n file_text->setText(fileName);\n }\n}\n<\/pre><\/div>\n\n\nThis block of code shows the implementation of the two slot methods specified in the call to connect(). Line 8 calls the static method QFileDialog::getExistingDirectory() which is implemented in the CsGui library. When the “Directory Name” button is clicked a new dialog box will be displayed with a system file dialog. When the user selects a directory and then clicks the Select Folder button, the path will be displayed in the line edit. The passed parameters set up the Window title, a prompt for the user, the initial directory, and a filter which limits the type of folders displayed. <\/p>\n\n\n\n
Line 19 calls the static method QFileDialog::getOpenFileName() which is also implemented in the CsGui library. When the “File Name” button is clicked a new dialog box will be displayed where the user can select the name of an existing file. In the passed parameters on line 21 you can pass a string indicating what type of files should be displayed. This string also populates the drop down box restricting the types of files shown. In this code we are allowing either *.*<\/strong><\/span> or *.txt<\/strong><\/span>.<\/p>\n\n\n\nFor both of these, when the user selects the directory or file a verification is made to ensure the value is not empty before updating the line edit widget. <\/p>\n\n\n\n
Main Function<\/h3>\n\n\n\n
Since the source code for main() has not changed there is no need to show it again. Refer to example 3 or download the full source for this example.<\/p>\n\n\n\n
Running the Example<\/h3>\n\n\n\n
To build and run this example use the same CMake build file and commands as we showed for the first example. The only suggested modification is on line 2 of the CMakeLists.txt file, change “example_1” to “example_13”. <\/p>\n\n\n\n