I've got a strange problem with filtering QFileSystemModel
In "dialog.ui" there is only a QListView.
main.cpp
#include "dialog.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Dialog w;
w.show();
return a.exec();
}
dialog.h
#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
#include <QtCore>
#include <QtGui>
#include <QFileSystemModel>
namespace Ui {
class Dialog;
}
class Dialog : public QDialog
{
Q_OBJECT
public:
explicit Dialog(QWidget *parent = 0);
~Dialog();
private:
Ui::Dialog *ui;
QFileSystemModel* fileModel;
};
#endif // DIALOG_H
dialog.cpp
#include "dialog.h"
#include "ui_dialog.h"
Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
ui->setupUi(this);
fileModel = new QFileSystemModel(this);
fileModel->setFilter(QDir::Files);
ui->listView->setModel(fileModel);
ui->listView->setRootIndex(fileModel->setRootPath("/"));
////////////////////////////////// - Problem!
fileModel->setRootPath("/home/");
fileModel->setRootPath("/");
//////////////////////////////////
}
Dialog::~Dialog()
{
delete ui;
}
The problem is I see "home" folder (only this one) on the list, although filtering is set to QDir::Files. How to delete this entry?
If you want a file explorer with tree view showing folders and list view showing files, change QListView to QTreeView, Use the following constructor code, which is portable:
Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
ui->setupUi(this);
fileModel = new QFileSystemModel(this);
fileModel->setFilter(QDir::Files);
ui->treeView->setModel(fileModel);
auto myhome = QStandardPaths::writableLocation(QStandardPaths::HomeLocation);
////////////////////////////////// - Problem!
ui->treeView->setRootIndex(fileModel->setRootPath(myhome));
ui->treeView->setRootIndex(fileModel->setRootPath("/"));
//////////////////////////////////
}
Related
New to C++ and Qt as part of a research project (biology) and have been struggling with presumably some quite simple stuff. I'd really appreciate someone's help.
I'm working with a GUI for a pre-existing programme and I'm trying to transfer a QString variable from the QLineEdit of one of the windows (inputform), to the QLineEdit of a second window (output form).
The bit I'm stuck with is that I need the output form to appear, with it's LineEdit pre-populated, when I click a button on a third window (filedialog).
Problem:
At start up --> two windows appear: filedialog and inputform.
User enters data into inputform's QLineEdit
User presses 'transferButton' on filedialog window
On button press --> outputform appears, with a QLineEdit pre-populated with the user's data (from the inputform).
I assume the problem is of the getter/setter variety and my variable is probably going out of scope, but I've tried following lots of similar examples but can't make it work.
Thanks in advance.
Here's my code:
Main.cpp
#include "filedialog.h"
#include "inputform.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
FileDialog w;
InputForm w2;
w.show();
w2.show();
return a.exec();
}
filedialog.h
#ifndef FILEDIALOG_H
#define FILEDIALOG_H
#include <QDialog>
namespace Ui {
class FileDialog;
}
class FileDialog : public QDialog
{
Q_OBJECT
public:
explicit FileDialog(QWidget *parent = nullptr);
~FileDialog();
void setFileName();
QString getFileName();
private slots:
void on_transferButton_clicked();
private:
Ui::FileDialog *ui;
QString fileName;
};
#endif // FILEDIALOG_H
filedialog.ccp
#include "filedialog.h"
#include "ui_filedialog.h"
#include "inputform.h"
#include "ui_inputform.h"
#include "outputform.h"
#include "ui_outputform.h"
FileDialog::FileDialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::FileDialog)
{
ui->setupUi(this);
}
FileDialog::~FileDialog()
{
delete ui;
}
void FileDialog::setFileName()
{
InputForm *inputform = new InputForm;
fileName = inputform->ui->inputLineEdit->text();
}
QString FileDialog::getFileName()
{
return fileName;
}
void FileDialog::on_transferButton_clicked()
{
setFileName();
OutPutForm *outputform = new OutPutForm;
outputform->ui->outputLineEdit->setText(getFileName());
outputform->show();
}
inputform.h
#ifndef INPUTFORM_H
#define INPUTFORM_H
#include <QWidget>
namespace Ui {
class InputForm;
}
class InputForm : public QWidget
{
Q_OBJECT
public:
explicit InputForm(QWidget *parent = nullptr);
~InputForm();
Ui::InputForm *ui;
};
#endif // INPUTFORM_H
inputform.ccp
#include "inputform.h"
#include "ui_inputform.h"
InputForm::InputForm(QWidget *parent) :
QWidget(parent),
ui(new Ui::InputForm)
{
ui->setupUi(this);
}
InputForm::~InputForm()
{
delete ui;
}
outputform.h
#ifndef OUTPUTFORM_H
#define OUTPUTFORM_H
#include <QWidget>
namespace Ui {
class OutPutForm;
}
class OutPutForm : public QWidget
{
Q_OBJECT
public:
explicit OutPutForm(QWidget *parent = nullptr);
~OutPutForm();
Ui::OutPutForm *ui;
};
#endif // OUTPUTFORM_H
outputform.ccp
#include "outputform.h"
#include "ui_outputform.h"
OutPutForm::OutPutForm(QWidget *parent) :
QWidget(parent),
ui(new Ui::OutPutForm)
{
ui->setupUi(this);
}
OutPutForm::~OutPutForm()
{
delete ui;
}
Thank you for your brief pointer.
After some playing around:
Setup mainwindow (or in my case main dialog window). Generate inputform instance, connect button to inputform.
FileDialog::FileDialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::FileDialog)
{
ui->setupUi(this);
InputForm *inputForm = new InputForm;
connect(ui->transferButton,SIGNAL(clicked()),inputForm,SLOT(getLineEditTextFunc()));
inputForm->show();
}
FileDialog::~FileDialog()
{
delete ui;
}
void FileDialog::on_transferButton_clicked()
{
}
Then from the input form:
Define a function to get the input form's LineEdit text (fileName); and then also generate an output form and populate it's LineEdit with the fileName variable.
InputForm::InputForm(QWidget *parent) :
QWidget(parent),
ui(new Ui::InputForm)
{
ui->setupUi(this);
}
InputForm::~InputForm()
{
delete ui;
}
void InputForm::getLineEditTextFunc()
{
fileName = this->ui->inputLineEdit->text();
OutPutForm *outputform = new OutPutForm;
outputform->ui->outputLineEdit->setText(fileName);
outputform->show();
}
In this code which can able to play video and play *.mp3. code works properly,in my mainwindow.ui I added widget called widgetGif by drag and drop .This widget containing label also. but this widget not visible when I run the program. How can I display this widget called widgetGif
here is part of my code :
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QMovie>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
player = new QMediaPlayer(this);
vw = new QVideoWidget (this);
player->setVideoOutput(vw);
this->setCentralWidget(vw); //I think this is the reason
slider = new QSlider(this);
bar = new QProgressBar(this);
slider->setOrientation(Qt::Horizontal);
ui->statusBar->addPermanentWidget(slider);
ui->statusBar->addPermanentWidget(bar);
connect(player,&QMediaPlayer::durationChanged,slider,&QSlider::setMaximum);
connect(player,&QMediaPlayer::positionChanged,slider,&QSlider::setValue);
connect(slider,&QSlider::sliderMoved,player,&QMediaPlayer::setPosition);
connect(player,&QMediaPlayer::durationChanged,bar,&QProgressBar::setMaximum);
connect(player,&QMediaPlayer::positionChanged,bar,&QProgressBar::setValue);
sliderVolumn = new QSlider(this);
sliderVolumn->setOrientation(Qt::Horizontal);
ui->statusBar->addPermanentWidget(sliderVolumn);
connect(sliderVolumn,&QSlider::sliderMoved,player,&QMediaPlayer::setVolume);
QMovie *movie=new QMovie(":/res/icons/giphy.gif");
if (!movie->isValid())
{
// Something went wrong :(
}
ui->labelGif->setMovie(movie);
movie->start();
ui->widgetGif->setVisible(true);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_actionOpen_triggered()
{
QString filename= QFileDialog::getOpenFileName(this,"Open Folder","","Open a File(*.*)");
on_actionStop_triggered();
player->setMedia(QUrl::fromLocalFile(filename));
on_actionPlay_triggered();
if(filename.endsWith(".mp3")){
qDebug() << " file is mp3";
}else{
qDebug() << " not is mp3";
}
}
QMainWindow needs a centralWidget. You must use layouts to include your QVideoWidget and also your widgetGif and then set it as centralWidget of the QMainWindow.
In the following example, textEdit would be your QVideoWidget and the object label is like your widgetGif.
We have also two buttons to hide or show label using the method setVisible.
main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
namespace Ui {
class MainWindow;
}
class QLabel;
class QPushButton;
class QTextEdit;
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
QWidget *centralWidget;
QLabel *label;
QPushButton *pushButton;
QPushButton *pushButton_2;
QTextEdit *textEdit;
public slots:
void showSlot();
void hideSlot();
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QVBoxLayout>
#include <QLabel>
#include <QPushButton>
#include <QTextEdit>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
// Vertical layout
QVBoxLayout *mainLayout = new QVBoxLayout;
// Widgets
centralWidget = new QWidget(this);
label = new QLabel();
pushButton = new QPushButton();
pushButton_2 = new QPushButton();
textEdit = new QTextEdit();
// Title and texts
this->setWindowTitle("MainWindow");
label->setText("TextLabel");
pushButton->setText("Show");
pushButton_2->setText("Hide");
// Add widgets to layout
mainLayout->addWidget(textEdit);
mainLayout->addWidget(label);
mainLayout->addWidget(pushButton);
mainLayout->addWidget(pushButton_2);
centralWidget->setLayout(mainLayout);
// Set the central widget
this->setCentralWidget(centralWidget);
connect(pushButton, SIGNAL (clicked()), this, SLOT (showSlot()));
connect(pushButton_2, SIGNAL (clicked()), this, SLOT (hideSlot()));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::showSlot()
{
label->setVisible(true);
}
void MainWindow::hideSlot()
{
label->setVisible(false);
}
I'm trying to connect a push button to a lineEdit.when click on push button,set text of lineEdit to "Hello".
but i have a problem with signal and slot!
This is my form
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(ui->pushButton,SIGNAL(clicked()),ui->lineEdit,SLOT(setText("Hello")));
}
MainWindow::~MainWindow()
{
delete ui;
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QLineEdit>
#include <QPushButton>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
Application output
Starting C:\Qt\Qt5.3.0\Tools\QtCreator\bin\build-E01S01-Desktop_Qt_5_3_0_MSVC2013_OpenGL_64bit-Debug\debug\E01S01.exe...
QObject::connect: No such slot QLineEdit::setText("Hello") in ..\E01S01\mainwindow.cpp:9
QObject::connect: (sender name: 'pushButton')
QObject::connect: (receiver name: 'lineEdit')
You can only connect a SIGNAL to a SLOT if they has the same signature.
You can use QSignalMapper to accomplish what you want:
QSignalMapper * mapper = new QSignalMapper(this);
QObject::connect(mapper, SIGNAL(mapped(const QString&)), ui->lineEdit, SLOT(setText(const QString&)));
QObject::connect(ui->pushButton, SIGNAL(clicked()), mapper, SLOT(map()));
mapper->setMapping(ui->pushButton, tr("Hello"));
Since you are using Qt5, you can use a lambda expression.
First make sure c++11 is enabled by adding CONFIG += c++11 in your .pro file.
#include <QApplication>
#include <QWidget>
#include <QLayout>
#include <QLineEdit>
#include <QPushButton>
class Widget : public QWidget
{
Q_OBJECT
public:
Widget(QWidget *parent = 0) : QWidget(parent)
{
setLayout(new QVBoxLayout);
QLineEdit *lineEdit = new QLineEdit("TEXT");
QPushButton *button = new QPushButton("BUTTON");
connect(button, &QPushButton::clicked, this, [=]{lineEdit->setText("PRESSED");});
layout()->addWidget(lineEdit);
layout()->addWidget(button);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();
return a.exec();
}
#include "main.moc"
Hello Im working through Qt tutorials I've have copy the code for the communicate section of this tutorial. the code compiles and shows but none of my buttons are clickable.
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
class QPushButton;
class QLabel;
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void OnPlus();
void OnMinus();
private:
Ui::MainWindow *ui;
QLabel *label;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtGui>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
QPushButton *plus = new QPushButton("+", this);
plus->setGeometry(50, 40, 75, 30);
QPushButton *minus = new QPushButton("-", this);
minus->setGeometry(50, 100, 75, 30);
label = new QLabel("0", this);
label->setGeometry(190, 80, 20, 30);
connect(plus, SIGNAL(clicked()), this, SLOT(OnPlus()));
connect(minus, SIGNAL(clicked()), this, SLOT(OnMinus()));
ui->setupUi(this);
}
void MainWindow::OnPlus()
{
int val = label->text().toInt();
val++;
label->setText(QString::number(val));
}
void MainWindow::OnMinus()
{
int val = label->text().toInt();
val--;
label->setText(QString::number(val));
}
MainWindow::~MainWindow()
{
delete ui;
}
main.cpp
#include <QtGui/QApplication>
#include "mainwindow.h"
#include <QPushButton>
#include <QLabel>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow window;
window.show();
return app.exec();
}
Your problem is with this line:
ui->setupUi(this);
It creates an invisible central widget for your main window, which blocks all events destined for your buttons, which is why they don't depress when you click them. Move this line to the beginning of your constructor for MainWindow and the problem will go away.
Question asked twice: see Handling multiple ui files in Qt
I am new to Qt framwork , i have been given this simple task:
In the MainWindow , i have a submit button , once its clicked another total different window should appear
i thought of doing this by doing one extra UI file called From.ui file and to switch from MainWindow to Form once submit is clicked , this is my code:
//main.cpp
#include "mainwindow.h"
#include <QtGui/QApplication>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow mainWindow;
mainWindow.setOrientation(MainWindow::ScreenOrientationAuto);
mainWindow.showExpanded();
return app.exec();
}
//MainWindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "form.h"
#include <QtCore/QCoreApplication>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow:: SubmitClicked()
{
Form* f= new Form(this);
f->show();
f->raise();
f->activateWindow();
}
//Form.cpp
#include "form.h"
#include "ui_form.h"
Form::Form(QWidget *parent) :
QWidget(parent),
ui(new Ui::Form)
{
ui->setupUi(this);
}
Form::~Form()
{
delete ui;
}
this code compiled perfectly , but its not doing as expected , once submit is clicked , nothing is done...
can you please tell me whats wrong ?
It seems that SubmitClicked slot is not connected to clicked event of your button
Put a cout/printf at the top of your SubmitClicked method to make sure that it is called.