#include <QApplication>
#include <QWidget>
#include <QMediaPlayer>
#include <QVideoWidget>
#include <QVBoxLayout>
#include <QImage>
#include <QLabel>
#include "videoplayer.h"
#include <QEvent>
#include <QMouseEvent>
class VideoPlayer : public QWidget {
    Q_OBJECT
public:
    VideoPlayer(QWidget *parent = nullptr) : QWidget(parent) {
        QVBoxLayout *layout = new QVBoxLayout(this);
        videoWidget = new QVideoWidget(this);
        layout->addWidget(videoWidget);

        player = new QMediaPlayer(this);
        player->setVideoOutput(videoWidget);

        connect(player, &QMediaPlayer::stateChanged, this, &VideoPlayer::mediaStateChanged);
        connect(player, &QMediaPlayer::mediaStatusChanged, this, &VideoPlayer::mediaStateChanged);

        logoLabel = new QLabel(this);
        logoPixmap = QPixmap("logo.png");
        logoLabel->setPixmap(logoPixmap);
        logoLabel->setScaledContents(true);
        logoLabel->hide();
        layout->addWidget(logoLabel);

        setLayout(layout);

        videoWidget->installEventFilter(this);
    }

    bool eventFilter(QObject *obj, QEvent *event) override {
        if (obj == videoWidget) {
            if (event->type() == QEvent::MouseButtonDblClick) {
                togglePlayPause();
            }
        }
        return QWidget::eventFilter(obj, event);
    }

    void togglePlayPause() {
        if (player->state() == QMediaPlayer::PlayingState)
            player->pause();
        else
            player->play();
        logoLabel->show();
    }

    void mediaStateChanged(QMediaPlayer::State state) {
        if (state == QMediaPlayer::PausedState) {
            logoLabel->show();
        } else {
            logoLabel->hide();
        }
    }

private:
    QMediaPlayer *player;
    QVideoWidget *videoWidget;
    QLabel *logoLabel;
    QPixmap logoPixmap;
};

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    VideoPlayer player;
    player.setWindowTitle("Video Player");
    player.resize(640, 480);
    player.show();

    player.player->setMedia(QUrl::fromLocalFile("C:/Users/vivek/Downloads/mixkit-going-down-a-curved-highway-through-a-mountain-range-41576-medium.mp4"));

    return app.exec();
}

#include "main.moc"

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}