When all channels disabled, the device options dialog not allowed to close

DSView/pv/dialogs/deviceoptions.cpp

@@ -50,7 +50,7 @@ ChannelLabel::ChannelLabel(IChannelCheck *check, QWidget *parent, int chanIndex)
 : QWidget(parent)
 {
     _checked = check;
-    _index = chanIndex;
+    _index = chanIndex;  
 
     QGridLayout *lay = new QGridLayout();
     lay->setContentsMargins(0,0,0,0);
@@ -100,6 +100,7 @@ DeviceOptions::DeviceOptions(QWidget *parent) :
     _container_lay = NULL;
     _isBuilding = false;
     _cur_analog_tag_index = 0;
+    _have_no_channel = false;
 
     SigSession *session = AppControl::Instance()->GetSession();
     _device_agent = session->get_device();
@@ -222,11 +223,14 @@ void DeviceOptions::accept()
             it++;
         }
 
-        QDialog::accept();
+        _have_no_channel = false;
+
+        QDialog::accept();        
     }
     else {
+        _have_no_channel = true;
         QString strMsg(L_S(STR_PAGE_MSG, S_ID(IDS_MSG_ALL_CHANNEL_DISABLE), "All channel disabled! Please enable at least one channel."));
-        MsgBox::Show(strMsg);
+        MsgBox::Show(strMsg);        
     }
 }
 
@@ -834,7 +838,6 @@ void DeviceOptions::build_dynamic_panel()
     _isBuilding = false;
 }
 
-int bb = 0;
 void DeviceOptions::try_resize_scroll()
 {
     this->update_font();
@@ -891,5 +894,15 @@ void DeviceOptions::try_resize_scroll()
     }
 }
 
+void DeviceOptions::keyPressEvent(QKeyEvent *event) 
+{
+    if (event->key() == Qt::Key_Escape && _have_no_channel) {
+        event->ignore();
+        return;
+    }
+
+    QDialog::keyPressEvent(event);
+}
+
 } // namespace dialogs
 } // namespace pv

DSView/pv/dialogs/deviceoptions.h

@@ -111,6 +111,8 @@ private:
 
     void channel_checkbox_clicked(QCheckBox *sc);
 
+    void keyPressEvent(QKeyEvent *) override;
+
 private:
     //IChannelCheck
     void ChannelChecked(int index, QObject *object);
@@ -149,6 +151,7 @@ private:
     std::vector<pv::prop::binding::ProbeOptions *> _probe_options_binding_list;
     std::vector<ChannelModePair> _channel_mode_indexs;
     std::vector<struct sr_channel*>     _dso_channel_list;
+    bool    _have_no_channel;
 };
 
 } // namespace dialogs