feat: single app with local socket

CMakeLists.txt

@@ -25,6 +25,8 @@ add_executable(${EXE_NAME}
   seekableslider.h
   playlistmodel.h
   playlistmodel.cpp
+  singleapplicationmanager.h
+  singleapplicationmanager.cpp
   mainwindow.ui
   resources.qrc
 

main.cpp

@@ -1,8 +1,11 @@
 #include "mainwindow.h"
 
+#include "singleapplicationmanager.h"
+
 #include <QApplication>
 #include <QCommandLineParser>
 #include <QUrl>
+#include <QDebug>
 
 int main(int argc, char *argv[])
 {
@@ -16,20 +19,22 @@ int main(int argc, char *argv[])
     parser.process(a);
 
     QStringList urlStrList = parser.positionalArguments();
-    QList<QUrl> urlList;
-    for (const QString & str : urlStrList) {
-        QUrl url = QUrl::fromLocalFile(str);
-        if (url.isValid()) {
-            urlList.append(url);
-        }
+
+    SingleApplicationManager sam("_pineapple_music_owo_");
+    if (sam.checkSingleInstance(QVariant::fromValue(urlStrList))) {
+        return 0;
+    } else {
+        sam.createSingleInstance();
     }
 
     MainWindow w;
     w.show();
 
-    if (!urlList.isEmpty()) {
-        w.commandlinePlayAudioFiles(urlList);
+    if (!urlStrList.isEmpty()) {
+        w.commandlinePlayAudioFiles(urlStrList);
     }
 
+    QObject::connect(&sam, &SingleApplicationManager::dataReached, &w, &MainWindow::localSocketPlayAudioFiles);
+
     return a.exec();
 }

mainwindow.cpp

@@ -40,13 +40,15 @@ MainWindow::~MainWindow()
     delete ui;
 }
 
-void MainWindow::commandlinePlayAudioFiles(QList<QUrl> audioFiles)
+void MainWindow::commandlinePlayAudioFiles(QStringList audioFiles)
 {
-    if (!audioFiles.isEmpty()) {
-        if (audioFiles.count() == 1) {
-            loadPlaylistBySingleLocalFile(audioFiles.first().toLocalFile());
+    QList<QUrl> audioFileUrls = strlst2urllst(audioFiles);
+
+    if (!audioFileUrls.isEmpty()) {
+        if (audioFileUrls.count() == 1) {
+            loadPlaylistBySingleLocalFile(audioFileUrls.first().toLocalFile());
         } else {
-            createPlaylist(audioFiles);
+            createPlaylist(audioFileUrls);
         }
         m_mediaPlayer->play();
     }
@@ -79,6 +81,17 @@ void MainWindow::loadPlaylistBySingleLocalFile(const QString &path)
     playlist->setCurrentIndex(currentFileIndex);
 }
 
+void MainWindow::localSocketPlayAudioFiles(QVariant audioFilesVariant)
+{
+    QStringList urlStrList = audioFilesVariant.toStringList();
+    qDebug() << urlStrList << "MainWindow::localSocketPlayAudioFiles";
+    commandlinePlayAudioFiles(urlStrList);
+
+    showNormal();
+    activateWindow();
+    raise();
+}
+
 void MainWindow::closeEvent(QCloseEvent *)
 {
     qApp->exit();
@@ -172,12 +185,14 @@ void MainWindow::loadFile()
  */
 QMediaPlaylist *MainWindow::createPlaylist(QList<QUrl> urlList)
 {
-    if (m_mediaPlayer->playlist()) {
-        m_mediaPlayer->playlist()->disconnect();
-    }
-
+    QMediaPlaylist * oldPlaylist = m_mediaPlayer->playlist();
     QMediaPlaylist * playlist = new QMediaPlaylist(m_mediaPlayer);
 
+    if (oldPlaylist) {
+        oldPlaylist->disconnect();
+        oldPlaylist->deleteLater();
+    }
+
     for (const QUrl & url : urlList) {
         bool succ = playlist->addMedia(QMediaContent(url));
         if (!succ) {
@@ -253,6 +268,19 @@ QString MainWindow::ms2str(qint64 ms)
     }
 }
 
+QList<QUrl> MainWindow::strlst2urllst(QStringList strlst)
+{
+    QList<QUrl> urlList;
+    for (const QString & str : strlst) {
+        QUrl url = QUrl::fromLocalFile(str);
+        if (url.isValid()) {
+            urlList.append(url);
+        }
+    }
+
+    return urlList;
+}
+
 void MainWindow::on_volumeSlider_valueChanged(int value)
 {
     if (m_mediaPlayer->isMuted()) {

mainwindow.h

@@ -2,6 +2,7 @@
 #define MAINWINDOW_H
 
 #include <QMainWindow>
+#include <QVariant>
 
 QT_BEGIN_NAMESPACE
 namespace Ui { class MainWindow; }
@@ -20,9 +21,12 @@ public:
     MainWindow(QWidget *parent = nullptr);
     ~MainWindow() override;
 
-    void commandlinePlayAudioFiles(QList<QUrl> audioFiles);
+    void commandlinePlayAudioFiles(QStringList audioFiles);
     void loadPlaylistBySingleLocalFile(const QString &path);
 
+public slots:
+    void localSocketPlayAudioFiles(QVariant audioFilesVariant);
+
 protected:
     void closeEvent(QCloseEvent *) override;
     void paintEvent(QPaintEvent *e) override;
@@ -38,8 +42,6 @@ protected:
 
 private slots:
     void on_playbackModeBtn_clicked();
-
-private slots:
     void on_closeWindowBtn_clicked();
     void on_playBtn_clicked();
     void on_volumeSlider_valueChanged(int value);
@@ -66,5 +68,6 @@ private:
     void initConnections();
 
     static QString ms2str(qint64 ms);
+    static QList<QUrl> strlst2urllst(QStringList strlst);
 };
 #endif // MAINWINDOW_H

singleapplicationmanager.cpp

@@ -0,0 +1,57 @@
+#include "singleapplicationmanager.h"
+
+#include <QDataStream>
+#include <QLocalServer>
+#include <QLocalSocket>
+
+SingleApplicationManager::SingleApplicationManager(QString applicationKey, QObject *parent)
+    : QObject(parent)
+    , m_applicationKey(applicationKey)
+{
+
+}
+
+void SingleApplicationManager::on_localSocket_newConnection()
+{
+    QScopedPointer<QLocalSocket> socket(m_localServer->nextPendingConnection());
+    if (socket) {
+        socket->waitForReadyRead(500);
+        QDataStream dataStream(socket.data());
+        QVariant data;
+        dataStream.startTransaction();
+        dataStream >> data;
+        dataStream.commitTransaction();
+        emit dataReached(data);
+    }
+}
+
+void SingleApplicationManager::createSingleInstance()
+{
+    m_localServer = new QLocalServer(this);
+
+    connect(m_localServer, &QLocalServer::newConnection, this, &SingleApplicationManager::on_localSocket_newConnection);
+
+    if (!m_localServer->listen(m_applicationKey)) {
+        if (m_localServer->serverError() == QAbstractSocket::AddressInUseError) {
+            QLocalServer::removeServer(m_applicationKey);
+            m_localServer->listen(m_applicationKey);
+        }
+    }
+}
+
+bool SingleApplicationManager::checkSingleInstance(QVariant data)
+{
+    QLocalSocket socket;
+    socket.connectToServer(m_applicationKey);
+    if (socket.waitForConnected(500)) {
+        QDataStream dataStream(&socket);
+        dataStream << data;
+
+        socket.waitForBytesWritten();
+        socket.close();
+
+        return true;
+    }
+
+    return false;
+}

singleapplicationmanager.h

@@ -0,0 +1,32 @@
+#ifndef SINGLEAPPLICATIONMANAGER_H
+#define SINGLEAPPLICATIONMANAGER_H
+
+#include <QObject>
+
+QT_BEGIN_NAMESPACE
+class QLocalServer;
+QT_END_NAMESPACE
+
+class SingleApplicationManager : public QObject
+{
+    Q_OBJECT
+public:
+    explicit SingleApplicationManager(QString applicationKey, QObject *parent = nullptr);
+
+    void createSingleInstance();
+    bool checkSingleInstance(QVariant data);
+
+signals:
+    void dataReached(QVariant data);
+
+private slots:
+    void on_localSocket_newConnection();
+
+private:
+
+    QString m_applicationKey;
+    QLocalServer * m_localServer;
+
+};
+
+#endif // SINGLEAPPLICATIONMANAGER_H