Don't show the download button if we are not connected to an online network.

Signed-off-by: Adam Treat <treat.adam@gmail.com>

gpt4all-chat/llm.cpp

@@ -9,6 +9,7 @@
 #include <QResource>
 #include <QSettings>
 #include <QUrl>
+#include <QNetworkInformation>
 #include <fstream>
 
 #ifndef GPT4ALL_OFFLINE_INSTALLER
@@ -39,6 +40,10 @@ LLM::LLM()
 #endif
 
     m_compatHardware = minimal;
+
+    QNetworkInformation::loadDefaultBackend();
+    connect(QNetworkInformation::instance(), &QNetworkInformation::reachabilityChanged,
+        this, &LLM::isNetworkOnlineChanged);
 }
 
 bool LLM::hasSettingsAccess() const
@@ -100,3 +105,11 @@ QString LLM::systemTotalRAMInGBString() const
 {
     return QString::fromStdString(getSystemTotalRAMInGBString());
 }
+
+bool LLM::isNetworkOnline() const
+{
+    if (!QNetworkInformation::instance())
+        return false;
+
+    return QNetworkInformation::instance()->reachability() == QNetworkInformation::Reachability::Online;
+}

gpt4all-chat/llm.h

@@ -6,6 +6,8 @@
 class LLM : public QObject
 {
     Q_OBJECT
+    Q_PROPERTY(bool isNetworkOnline READ isNetworkOnline NOTIFY isNetworkOnlineChanged)
+
 public:
     static LLM *globalInstance();
 
@@ -17,10 +19,10 @@ public:
     Q_INVOKABLE static bool fileExists(const QString &path);
     Q_INVOKABLE qint64 systemTotalRAMInGB() const;
     Q_INVOKABLE QString systemTotalRAMInGBString() const;
+    Q_INVOKABLE bool isNetworkOnline() const;
 
 Q_SIGNALS:
-    void chatListModelChanged();
-    void modelListChanged();
+    void isNetworkOnlineChanged();
 
 private:
     bool m_compatHardware;

gpt4all-chat/main.qml

@@ -869,6 +869,7 @@ Window {
 
                         MyButton {
                             id: downloadButton
+                            visible: LLM.isNetworkOnline
                             Layout.alignment: Qt.AlignHCenter
                             Layout.topMargin: 40
                             text: qsTr("Download models")