I am writing a QtQuick desktop application. I use both c++ (for functionality) and QML (for UI) in it.
I use QQuickView to show the interface written in QML.
I want this application to reside in System Tray when minimised.
I mean a functionality similar to this example. http://qt-project.org/doc/qt-4.8/desktop-systray.html .
I am trying to implement this feature but could not find a way to do this in my Qt Quick application.
Here is my main.cpp code:
#include <QGuiApplication>
#include <QQmlEngine>
#include <QQmlContext>
#include <QQmlFileSelector>
#include <QQuickView>
#include "myapp.h"
int main(int argc, char* argv[])
{
QGuiApplication app(argc,argv);
app.setApplicationName(QFileInfo(app.applicationFilePath()).baseName());
QDir::setCurrent(qApp->applicationDirPath());
MyApp myappObject;
QQuickView view;
view.connect(view.engine(), SIGNAL(quit()), &app, SLOT(quit()));
view.rootContext()->setContextProperty("myappObject", &myappObject);
new QQmlFileSelector(view.engine(), &view);
view.setSource(QUrl("qrc:///myapp.qml"));
view.setResizeMode(QQuickView::SizeRootObjectToView);
view.show();
return app.exec();
}
Please help by providing any hint/pointers to do this.
Thanks.
I was facing the same challenge today and ended up using the following solution within main(). Works great for me when using Qt 5.3. You should of course implement a better way to check whether the first root object is your application window object or not.
#include <QApplication>
#include <QQmlApplicationEngine>
#include <QMessageBox>
#include <QAction>
#include <QMenu>
#include <QSystemTrayIcon>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
if (!QSystemTrayIcon::isSystemTrayAvailable()) {
QMessageBox::critical(0, QObject::tr("Systray"),
QObject::tr("I couldn't detect any system tray "
"on this system."));
return 1;
}
QApplication::setQuitOnLastWindowClosed(false);
QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:///main.qml")));
QObject *root = 0;
if (engine.rootObjects().size() > 0)
{
root = engine.rootObjects().at(0);
QAction *minimizeAction = new QAction(QObject::tr("Mi&nimize"), root);
root->connect(minimizeAction, SIGNAL(triggered()), root, SLOT(hide()));
QAction *maximizeAction = new QAction(QObject::tr("Ma&ximize"), root);
root->connect(maximizeAction, SIGNAL(triggered()), root, SLOT(showMaximized()));
QAction *restoreAction = new QAction(QObject::tr("&Restore"), root);
root->connect(restoreAction, SIGNAL(triggered()), root, SLOT(showNormal()));
QAction *quitAction = new QAction(QObject::tr("&Quit"), root);
root->connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
QMenu *trayIconMenu = new QMenu();
trayIconMenu->addAction(minimizeAction);
trayIconMenu->addAction(maximizeAction);
trayIconMenu->addAction(restoreAction);
trayIconMenu->addSeparator();
trayIconMenu->addAction(quitAction);
QSystemTrayIcon *trayIcon = new QSystemTrayIcon(root);
trayIcon->setContextMenu(trayIconMenu);
trayIcon->setIcon(QIcon(":/resources/DatagnanLogoColor.png"));
trayIcon->show();
}
return app.exec();
}
Copy the Windos class (window.cpp/window.h) from systray example to your project, port it to Qt5 if necessary and open both from your main file:
int main(int argc, char* argv[])
{
// ...
QQuickView view;
// ...
view.show();
Window window;
window.show();
return app.exec();
}
Related
It is very straightforward to connect to QMenu::triggered or QMenu::hovered signals by calling QObject::connect and pass the appropriate QAction.
However, I do not know how to use QMenu::aboutToHide signal, as there is no action passed to that signal.
How to use QMenu::aboutToHide and QMenu::aboutToShow signals or those are just virtual functions that can be overridden?
The signals in the world of Qt are not functions, never invoke them. The signals notify that something has happened with the QObject and send information if necessary.
In the case of triggered and hovered it is necessary to send the QAction because several QActions in a QMenu, then the developer thought that it is necessary to know with which QAction was interacting. On the other hand with aboutToShow and aboutToHide the signal does not send anything because it wants to notify is that if the QMenu was shown or hidden, respectively. Is there any need to know that QMenu was shown or hidden if he did it ? no, because the sender did it, I do not use other properties that we do not have at hand.
Example of use:
#include <QApplication>
#include <QMainWindow>
#include <QMenuBar>
#include <QDebug>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QMainWindow w;
QMenu *foo_menu = w.menuBar()->addMenu("Foo Menu");
for(const QString & name: {"action1", "action2", "action3"}){
foo_menu->addAction(name);
}
QObject::connect(foo_menu, &QMenu::aboutToShow, [](){
qDebug()<<"aboutToShow";
});
QObject::connect(foo_menu, &QMenu::aboutToHide, [](){
qDebug()<<"aboutToHide";
});
QObject::connect(foo_menu, &QMenu::triggered, [](QAction *action){
qDebug()<< "triggered: " <<action->text();
});
QObject::connect(foo_menu, &QMenu::hovered, [](QAction *action){
qDebug()<< "hovered: " <<action->text();
});
w.show();
return a.exec();
}
And what happens if you have several QMenu that connect to the same slot? How do I know QMenu was shown or hidden?
The solution is to use sender() which is a method that belongs to the QObject class that returns the object that emitted the signal, in this case the QMenu.
Example:
#include <QApplication>
#include <QMainWindow>
#include <QMenuBar>
#include <QDebug>
class MainWindow: public QMainWindow{
public:
MainWindow(QWidget *parent=nullptr):
QMainWindow(parent)
{
for(const QString & name_of_menubar: {"bar1", "bar2", "bar3"}){
QMenu *menu = menuBar()->addMenu(name_of_menubar);
connect(menu, &QMenu::aboutToShow, this, &MainWindow::on_aboutToShow);
connect(menu, &QMenu::aboutToHide, this, &MainWindow::on_aboutToHide);
for(const QString & name: {"action1", "action2", "action3"}){
menu->addAction(name);
}
}
}
private slots:
void on_aboutToShow(){
if(QMenu *menu = qobject_cast<QMenu *>(sender()))
qDebug()<<"aboutToShow" << menu->title();
}
void on_aboutToHide(){
if(QMenu *menu = qobject_cast<QMenu *>(sender()))
qDebug()<<"aboutToHide" << menu->title();
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
I am making a very simple application which plays a video using QMediaPlayer/QGraphicsVideoItem/QGraphicsScene/QGraphicsView and in the meantime, it displays a web page using QWebEngineView.
However, when the QWebEngineView shows, only the sound of the video is played. The widget shows only white. When QWebEngineView's ->show() is not called, the video plays normally.
I've tried QVideoWidget. It doesn't have such problem.
I'm thinking that the rendering of the QGraphicsView might have conflicts with QWebEngine's.
Here's the code:
#include "mainwindow.h"
#include <QApplication>
#include <QWebEngineView>
#include <QGraphicsView>
#include <QGraphicsScene>
#include <QMediaPlayer>
#include <QVideoWidget>
#include <QGraphicsVideoItem>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QWebEngineView *webview = new QWebEngineView();
QMediaPlayer *player = new QMediaPlayer();
QGraphicsVideoItem *item = new QGraphicsVideoItem;
QVideoWidget *vwid = new QVideoWidget();
QGraphicsView *gview = new QGraphicsView();
player->setMedia(QUrl::fromLocalFile("/home/user/Videos/IMG_6201.MOV"));
//player->setVideoOutput(vwid);
player->setVideoOutput(item);
QGraphicsScene *gscene = new QGraphicsScene();
gview->setScene(gscene);
webview.setUrl(QUrl("https://www.google.com"));
gview->scene()->addItem(item);
//vwid->show();
player->play();
webview->show();
gview->show();
return a.exec();
}
I've recently started learning Qt and I'm a beginner of it now. So as first example for myself I wrote the following simple example.
The example is named Calculator. It now only has two buttons an a line edit. It's here:
:
My Calculator.h is this:
#ifndef CALCULATOR_H
#define CALCULATOR_H
#include<QDialog>
#include "ui_Calculator.h"
class Calculator : public QDialog, public Ui::Calculator
{
Q_OBJECT
public:
Calculator(QWidget* parent = 0);
private slots:
void myslot();
};
#endif // CALCULATOR_H
And the Calculator.cpp is this:
#include <QtWidgets>
#include "calculator.h"
Calculator::Calculator(QWidget *parent)
:QDialog(parent)
{
setupUi(this);
connect(oneButton,SIGNAL(clicked(bool)), this, SLOT(myslot()));
}
void Calculator::myslot(){
lineEdit -> setText("1");
}
And this is the main.cpp:
#include <QApplication>
#include <QDialog>
#include "ui_Calculator.h"
int main(int argc, char* argv[])
{
QApplication app(argc, argv);
Ui::Calculator ui;
QDialog* dialog = new QDialog;
ui.setupUi(dialog);
dialog -> show();
return app.exec();
}
The program runs fine without any error. But when I click on 1 button, nothing will be printed/shown in the line edit. Why please?
And what part of my program should I change to solve the issue please?
You are setting up the wrong class in your main.
You should use your custom Calculator class and not QDialog.
setupUi only initializes your elements but your code in Calculator never gets called. Your main should look like this:
int main(int argc, char* argv[])
{
QApplication app(argc, argv);
Calculator calc; //using your Calculator class.
calc.show();
return app.exec();
}
And don't include ui_calculator.h but calculator.h
The code below loads an image using QLabel. The code uses: myLabel.setMask(pixmap.mask()); and it works as it should. The problem comes when I try and load an image using QGraphicsScene.
#include <QApplication>
#include <QLabel>
#include <QtGui>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QLabel myLabel;
QPixmap pixmap("/path/tomy/image.jpg");
myLabel.setPixmap(pixmap);
myLabel.setMask(pixmap.mask());
myLabel.show();
return app.exec();
}
In this code I am attempting to the same as above but using QGraphicsScene. The pixmap is loaded properly, after that I am not sure why the program is not working properly. Is it because there is no setMask() operation? Or is there an operation missing that is needed to make the image visible?
#include <QtGlobal>
#if QT_VERSION >= 0x050000
#include <QtWidgets>
#else
#include <QtGui>
#endif
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QPixmap pixmap("/path/tomy/image.jpg");
QGraphicsPixmapItem item( pixmap);
QGraphicsScene* scene = new QGraphicsScene;
scene->addItem(&item);
QGraphicsView view(scene);
view.show();
return a.exec();
}
Hello so i have a BIG problem with QWebViewEngine so far. Because all i did was created a QWebEngineView and said .load(QUrl("http://google.com")) and then .showFullScreen(). On start the application took about 130MB of RAM. When i pressed feel lucky on google and the page loaded suddenly the RAM started to climbing by 200mb each second and it stopped when there was no more free RAM.
Anyone had this problem, or experience with QWebEngineView.
I know its Chormium, but it seems to me as if it wasnt working correctly.
Any suggestions how to correct this?
Edited 14/08/2015 14:12
here is the code(note that most of it is commented):
#include "mainwindow.h"
#include <QtWebEngineWidgets/QtWebEngineWidgets>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QScopedPointer>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
view = new QWebEngineView();
manager = new QNetworkAccessManager();
settings = new QSettings(":/settings.ini",QSettings::IniFormat);
// connect(view,SIGNAL(loadFinished(bool)),this,SLOT(CheckPage()));
// connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(connection(QNetworkReply*)));
// errorOpen=false;
settings->beginGroup("URL");
myUrl = settings->value("curUrl").toString();
settings->endGroup();
// view->load(myUrl);
view->load(QUrl("http://google.com"));
view->showFullScreen();
settings->deleteLater();
}
MainWindow::~MainWindow()
{
// delete view;
// delete manager;
}
I can't reproduce under qt5-mac #5.4.2_1 from macports on OS X 10.9:
//main.cpp
#include <QtWebEngineWidgets>
#include <QApplication>
int main(int argc, char ** argv)
{
QApplication a(argc, argv);
QWebEngineView view;
view.load(QUrl("http://google.com"));
view.showFullScreen();
return a.exec();
}
# chromium-32008560.pro
QT += webenginewidgets
TARGET = chromium-32008560
TEMPLATE = app
SOURCES += main.cpp