From bef3506a38b65066ff77a6cf72558ca5a46c2a69 Mon Sep 17 00:00:00 2001
From: Volker Fischer <corrados@users.noreply.github.com>
Date: Mon, 30 Mar 2020 19:53:30 +0200
Subject: [PATCH] added a scroll area to the mixer board so that a large number
 of clients can be supported, thanks to doloopuntil for his example code

---
 src/audiomixerboard.cpp | 22 ++++++++++++++++------
 src/audiomixerboard.h   |  4 +++-
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/src/audiomixerboard.cpp b/src/audiomixerboard.cpp
index 8cd770f6..bdff8f11 100755
--- a/src/audiomixerboard.cpp
+++ b/src/audiomixerboard.cpp
@@ -464,19 +464,20 @@ double CChannelFader::CalcFaderGain ( const int value )
 * CAudioMixerBoard                                                             *
 \******************************************************************************/
 CAudioMixerBoard::CAudioMixerBoard ( QWidget* parent, Qt::WindowFlags ) :
-    QGroupBox            ( parent ),
+    QScrollArea          ( parent ),
     vecStoredFaderTags   ( MAX_NUM_STORED_FADER_SETTINGS, "" ),
     vecStoredFaderLevels ( MAX_NUM_STORED_FADER_SETTINGS, AUD_MIX_FADER_MAX ),
     vecStoredFaderIsSolo ( MAX_NUM_STORED_FADER_SETTINGS, false ),
     iNewClientFaderLevel ( 100 ),
     bNoFaderVisible      ( true )
 {
+    // add group box and hboxlayout
+    pGroupBox   = new QGroupBox(); // will be added to the scroll area which is then the parent
+    pMainLayout = new QHBoxLayout ( pGroupBox );
+
     // set title text (default: no server given)
     SetServerName ( "" );
 
-    // add hboxlayout
-    pMainLayout = new QHBoxLayout ( this );
-
     // create all mixer controls and make them invisible
     vecpChanFader.Init ( MAX_NUM_CHANNELS );
 
@@ -489,6 +490,15 @@ CAudioMixerBoard::CAudioMixerBoard ( QWidget* parent, Qt::WindowFlags ) :
     // insert horizontal spacer
     pMainLayout->addItem ( new QSpacerItem ( 0, 0, QSizePolicy::Expanding ) );
 
+    // add the group box to the scroll area
+    setMinimumWidth ( 200 ); // at least two faders shall be visible
+    setWidget ( pGroupBox );
+    setWidgetResizable ( true ); // make sure it fills the entire scroll area
+    setVerticalScrollBarPolicy ( Qt::ScrollBarAlwaysOff );
+    setHorizontalScrollBarPolicy ( Qt::ScrollBarAsNeeded );
+    setStyleSheet ( "background: transparent;" );
+    setFrameShape ( QFrame::NoFrame );
+
 
     // Connections -------------------------------------------------------------
     // CODE TAG: MAX_NUM_CHANNELS_TAG
@@ -601,11 +611,11 @@ void CAudioMixerBoard::SetServerName ( const QString& strNewServerName )
     // set title text of the group box
     if ( strNewServerName.isEmpty() )
     {
-        setTitle ( "Server" );
+        pGroupBox->setTitle ( "Server" );
     }
     else
     {
-        setTitle ( strNewServerName );
+        pGroupBox->setTitle ( strNewServerName );
     }
 }
 
diff --git a/src/audiomixerboard.h b/src/audiomixerboard.h
index b8a3c0cb..a8c7e101 100755
--- a/src/audiomixerboard.h
+++ b/src/audiomixerboard.h
@@ -25,6 +25,7 @@
 #pragma once
 
 #include <QFrame>
+#include <QScrollArea>
 #include <QGroupBox>
 #include <QLabel>
 #include <QCheckBox>
@@ -89,7 +90,7 @@ signals:
 };
 
 
-class CAudioMixerBoard : public QGroupBox
+class CAudioMixerBoard : public QScrollArea
 {
     Q_OBJECT
 
@@ -121,6 +122,7 @@ protected:
                               const double dValue );
 
     CVector<CChannelFader*> vecpChanFader;
+    QGroupBox*              pGroupBox;
     QHBoxLayout*            pMainLayout;
     bool                    bNoFaderVisible;