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

Qt Enthusiast

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

Qt Enthusiast

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

mrjj

@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.

Qt Enthusiast

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

VRonin

@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

Qt Enthusiast

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

VRonin

PNG is not animated...

Qt Enthusiast

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

Qt Enthusiast

#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

Christian Ehrlicher

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

Qt Enthusiast

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

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