Important: Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

How to display blinking [animate] red/green status icon in qt



  • I have a scenario where some processing is happening in GUI , when the processing the flag is on and otherwise is flag is off

    if (flag)
    Show the rotating image like this ![0_1538288635109_rotating.PNG]
    (https://ddgobkiprc33d.cloudfront.net/d968e3c5-1c70-4e8d-b5dd-89a31f9887fc.PNG)

    else
    show a red color circle in status bar



  • can we have a image that is starts blinking at certain condiation and stops blinking at certain condition


  • Lifetime Qt Champion

    @Qt-Enthusiast
    Hi
    Yes, if you use QMovie with QLabel and a animated gif, you
    can stop the animation and resume to make it blink.
    However, if u need BOTH rotating and blinking, it will be hard
    to find gif.



  • Only one will work but a small small sample example with help



  • @Qt-Enthusiast said in How to display blinking [animate] red/green status icon in qt:

    small small sample example with help

    Did you look at the docs? http://doc.qt.io/qt-5/qmovie.html#details has a minimal example of how to set a gif in a QLabel



  • how to get PNG image data, 16 x 16, 8-bit/color RGBA, non-interlaced of loader.gif any source will help



  • PNG is not animated...



  • I looked at the code of QMovie how to show bliking cursor in status bar is still not clear to me
    if you can code for me that will be helpful



  • #include <QtGui>
    
    #include "mainwindow.h"
    //! [0]
    
    //! [1]
    //
    //
    //
    //
    //
    
    class blinkCursor : public QLabel
    {
        Q_OBJECT
    public:
        explicit blinkCursor(QWidget *parent = 0); 
       ~blinkCursor();    
    signals: 
        
    public slots: 
        void startProgress();
        void stopOnOk();
        void stopOnError();
        void startTimer(int interval);
    
    private:
       QMovie* movie;
        QTimer *timer;
    };
    
    blinkCursor::blinkCursor(QWidget *parent) :
        QLabel(parent)
    {
         movie  = new QMovie("/home/rlalwani/loader.gif");
         setStyleSheet("QLabel { background-color : green; color : blue; }");
          setMinimumWidth(80);
    
    }  
    blinkCursor::~blinkCursor()
    {
    } 
    
    void blinkCursor::startProgress()
    {
    
        this->setMovie(movie); 
        show();
        movie->start();
       return;
    }
    
    void blinkCursor::stopOnOk()
    {
        movie->stop();
        return;
    }
    
    void blinkCursor::stopOnError()
    {
       }
    
    void blinkCursor::startTimer(int interval)
    {
    }
    
     
    
    MainWindow::MainWindow()
    //! [1] //! [2]
    {
        textEdit = new QPlainTextEdit;
        setCentralWidget(textEdit);
    
        createActions();
        createMenus();
        createToolBars();
        createStatusBar();
    
        readSettings();
    
        connect(textEdit->document(), SIGNAL(contentsChanged()),
                this, SLOT(documentWasModified()));
    
        setCurrentFile("");
        setUnifiedTitleAndToolBarOnMac(true);
        blinkCursor* bC = new blinkCursor;
        statusBar()->addPermanetWidget(blinkCursor);
    }
    //! [2]
    
    //! [3]
    void MainWindow::closeEvent(QCloseEvent *event)
    //! [3] //! [4]
    {
        if (maybeSave()) {
            writeSettings();
            event->accept();
        } else {
            event->ignore();
        }
    }
    //! [4]
    
    //! [5]
    void MainWindow::newFile()
    //! [5] //! [6]
    {
        if (maybeSave()) {
            textEdit->clear();
            setCurrentFile("");
        }
    }
    //! [6]
    
    //! [7]
    void MainWindow::open()
    //! [7] //! [8]
    {
        if (maybeSave()) {
            QString fileName = QFileDialog::getOpenFileName(this);
            if (!fileName.isEmpty())
                loadFile(fileName);
        }
    }
    //! [8]
    
    //! [9]
    bool MainWindow::save()
    //! [9] //! [10]
    {
        if (curFile.isEmpty()) {
            return saveAs();
        } else {
            return saveFile(curFile);
        }
    }
    //! [10]
    
    //! [11]
    bool MainWindow::saveAs()
    //! [11] //! [12]
    {
        QString fileName = QFileDialog::getSaveFileName(this);
        if (fileName.isEmpty())
            return false;
    
        return saveFile(fileName);
    }
    //! [12]
    
    //! [13]
    void MainWindow::about()
    //! [13] //! [14]
    {
       QMessageBox::about(this, tr("About Application"),
                tr("The <b>Application</b> example demonstrates how to "
                   "write modern GUI applications using Qt, with a menu bar, "
                   "toolbars, and a status bar."));
    }
    //! [14]
    
    //! [15]
    void MainWindow::documentWasModified()
    //! [15] //! [16]
    {
        setWindowModified(textEdit->document()->isModified());
    }
    //! [16]
    
    //! [17]
    void MainWindow::createActions()
    //! [17] //! [18]
    {
        newAct = new QAction(QIcon(":/images/new.png"), tr("&New"), this);
        newAct->setShortcuts(QKeySequence::New);
        newAct->setStatusTip(tr("Create a new file"));
        connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));
    
    //! [19]
        openAct = new QAction(QIcon(":/images/open.png"), tr("&Open..."), this);
        openAct->setShortcuts(QKeySequence::Open);
        openAct->setStatusTip(tr("Open an existing file"));
        connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
    //! [18] //! [19]
    
        saveAct = new QAction(QIcon(":/images/save.png"), tr("&Save"), this);
        saveAct->setShortcuts(QKeySequence::Save);
        saveAct->setStatusTip(tr("Save the document to disk"));
        connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));
    
        saveAsAct = new QAction(tr("Save &As..."), this);
        saveAsAct->setShortcuts(QKeySequence::SaveAs);
        saveAsAct->setStatusTip(tr("Save the document under a new name"));
        connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));
    
    //! [20]
        exitAct = new QAction(tr("E&xit"), this);
        exitAct->setShortcuts(QKeySequence::Quit);
    //! [20]
        exitAct->setStatusTip(tr("Exit the application"));
        connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
    
    //! [21]
        cutAct = new QAction(QIcon(":/images/cut.png"), tr("Cu&t"), this);
    //! [21]
        cutAct->setShortcuts(QKeySequence::Cut);
        cutAct->setStatusTip(tr("Cut the current selection's contents to the "
                                "clipboard"));
        connect(cutAct, SIGNAL(triggered()), textEdit, SLOT(cut()));
    
        copyAct = new QAction(QIcon(":/images/copy.png"), tr("&Copy"), this);
        copyAct->setShortcuts(QKeySequence::Copy);
        copyAct->setStatusTip(tr("Copy the current selection's contents to the "
                                 "clipboard"));
        connect(copyAct, SIGNAL(triggered()), textEdit, SLOT(copy()));
    
        pasteAct = new QAction(QIcon(":/images/paste.png"), tr("&Paste"), this);
        pasteAct->setShortcuts(QKeySequence::Paste);
        pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "
                                  "selection"));
        connect(pasteAct, SIGNAL(triggered()), textEdit, SLOT(paste()));
    
        aboutAct = new QAction(tr("&About"), this);
        aboutAct->setStatusTip(tr("Show the application's About box"));
        connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
    
    //! [22]
        aboutQtAct = new QAction(tr("About &Qt"), this);
        aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
        connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
    //! [22]
    
    //! [23]
        cutAct->setEnabled(false);
    //! [23] //! [24]
        copyAct->setEnabled(false);
        connect(textEdit, SIGNAL(copyAvailable(bool)),
                cutAct, SLOT(setEnabled(bool)));
        connect(textEdit, SIGNAL(copyAvailable(bool)),
                copyAct, SLOT(setEnabled(bool)));
    }
    //! [24]
    
    //! [25] //! [26]
    void MainWindow::createMenus()
    //! [25] //! [27]
    {
        fileMenu = menuBar()->addMenu(tr("&File"));
        fileMenu->addAction(newAct);
    //! [28]
        fileMenu->addAction(openAct);
    //! [28]
        fileMenu->addAction(saveAct);
    //! [26]
        fileMenu->addAction(saveAsAct);
        fileMenu->addSeparator();
        fileMenu->addAction(exitAct);
    
        editMenu = menuBar()->addMenu(tr("&Edit"));
        editMenu->addAction(cutAct);
        editMenu->addAction(copyAct);
        editMenu->addAction(pasteAct);
    
        menuBar()->addSeparator();
    
        helpMenu = menuBar()->addMenu(tr("&Help"));
        helpMenu->addAction(aboutAct);
        helpMenu->addAction(aboutQtAct);
    }
    //! [27]
    
    //! [29] //! [30]
    void MainWindow::createToolBars()
    {
        fileToolBar = addToolBar(tr("File"));
        fileToolBar->addAction(newAct);
    //! [29] //! [31]
        fileToolBar->addAction(openAct);
    //! [31]
        fileToolBar->addAction(saveAct);
    
        editToolBar = addToolBar(tr("Edit"));
        editToolBar->addAction(cutAct);
        editToolBar->addAction(copyAct);
        editToolBar->addAction(pasteAct);
    }
    //! [30]
    
    //! [32]
    void MainWindow::createStatusBar()
    //! [32] //! [33]
    {
        statusBar()->showMessage(tr("Ready"));
    }
    //! [33]
    
    //! [34] //! [35]
    void MainWindow::readSettings()
    //! [34] //! [36]
    {
        QSettings settings("Trolltech", "Application Example");
        QPoint pos = settings.value("pos", QPoint(200, 200)).toPoint();
        QSize size = settings.value("size", QSize(400, 400)).toSize();
        resize(size);
        move(pos);
    }
    //! [35] //! [36]
    
    //! [37] //! [38]
    void MainWindow::writeSettings()
    //! [37] //! [39]
    {
        QSettings settings("Trolltech", "Application Example");
        settings.setValue("pos", pos());
        settings.setValue("size", size());
    }
    //! [38] //! [39]
    
    //! [40]
    bool MainWindow::maybeSave()
    //! [40] //! [41]
    {
        if (textEdit->document()->isModified()) {
            QMessageBox::StandardButton ret;
            ret = QMessageBox::warning(this, tr("Application"),
                         tr("The document has been modified.\n"
                            "Do you want to save your changes?"),
                         QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
            if (ret == QMessageBox::Save)
                return save();
            else if (ret == QMessageBox::Cancel)
                return false;
        }
        return true;
    }
    //! [41]
    
    //! [42]
    void MainWindow::loadFile(const QString &fileName)
    //! [42] //! [43]
    {
        QFile file(fileName);
        if (!file.open(QFile::ReadOnly | QFile::Text)) {
            QMessageBox::warning(this, tr("Application"),
                                 tr("Cannot read file %1:\n%2.")
                                 .arg(fileName)
                                 .arg(file.errorString()));
            return;
        }
    
        QTextStream in(&file);
    #ifndef QT_NO_CURSOR
        QApplication::setOverrideCursor(Qt::WaitCursor);
    #endif
        textEdit->setPlainText(in.readAll());
    #ifndef QT_NO_CURSOR
        QApplication::restoreOverrideCursor();
    #endif
    
        setCurrentFile(fileName);
        statusBar()->showMessage(tr("File loaded"), 2000);
    }
    //! [43]
    
    //! [44]
    bool MainWindow::saveFile(const QString &fileName)
    //! [44] //! [45]
    {
        QFile file(fileName);
        if (!file.open(QFile::WriteOnly | QFile::Text)) {
            QMessageBox::warning(this, tr("Application"),
                                 tr("Cannot write file %1:\n%2.")
                                 .arg(fileName)
                                 .arg(file.errorString()));
            return false;
        }
    
        QTextStream out(&file);
    #ifndef QT_NO_CURSOR
        QApplication::setOverrideCursor(Qt::WaitCursor);
    #endif
        out << textEdit->toPlainText();
    #ifndef QT_NO_CURSOR
        QApplication::restoreOverrideCursor();
    #endif
    
        setCurrentFile(fileName);
        statusBar()->showMessage(tr("File saved"), 2000);
        return true;
    }
    //! [45]
    
    //! [46]
    void MainWindow::setCurrentFile(const QString &fileName)
    //! [46] //! [47]
    {
        curFile = fileName;
        textEdit->document()->setModified(false);
        setWindowModified(false);
    
        QString shownName = curFile;
        if (curFile.isEmpty())
            shownName = "untitled.txt";
        setWindowFilePath(shownName);
    }
    //! [47]
    
    //! [48]
    QString MainWindow::strippedName(const QString &fullFileName)
    //! [48] //! [49]
    {
        return QFileInfo(fullFileName).fileName();
    }
    //! [49]
    

    Complied code


  • Qt Champions 2019

    And you really want to say us that you even tried to compile this piece of whatever?



  • This is just a smaple I have tried to take from my own code base


Log in to reply