Add tooltips to fxmixer faders

Added tooltips to show the actual value when moving the fader handle.
This works mostly like the same feature we already have for the volume
knobs. Depending on settings the value is shown in a range between
0% to 200% or -inf/-34dBV to 6.02 dBV. Again that's the same as for the
volume knob. Value range could be adjusted easily if necessary.

Closes #3305914.

Signed-off-by: Tobias Doerffel <tobias.doerffel@gmail.com>

include/fader.h

@@ -53,6 +53,8 @@
 
 #include "AutomatableModelView.h"
 
+class textFloat;
+
 
 class fader : public QWidget, public FloatModelView
 {
@@ -75,9 +77,18 @@ class fader : public QWidget, public FloatModelView
 	virtual void contextMenuEvent( QContextMenuEvent * _me );
 	virtual void mousePressEvent( QMouseEvent *ev );
 	virtual void mouseMoveEvent( QMouseEvent *ev );
+	virtual void mouseReleaseEvent( QMouseEvent * _me );
 	virtual void wheelEvent( QWheelEvent *ev );
 	virtual void paintEvent( QPaintEvent *ev );
 
+	inline uint knob_y() const
+	{
+		float fRange = m_model->maxValue() - m_model->minValue();
+		float realVal = m_model->value() - m_model->minValue();
+//		uint knob_y = (uint)( 116.0 - ( 86.0 * ( m_model->value() / fRange ) ) );
+		return (uint)( 116.0 - ( 86.0 * ( realVal / fRange ) ) );
+	}
+
 	FloatModel * m_model;
 
 	float m_fPeakValue_L;
@@ -88,6 +99,10 @@ class fader : public QWidget, public FloatModelView
 	QPixmap m_back;
 	QPixmap m_leds;
 	QPixmap m_knob;
+
+	static textFloat * s_textFloat;
+	void updateTextFloat();
+
 } ;
 
 

src/gui/widgets/fader.cpp

@@ -53,9 +53,13 @@
 #include "embed.h"
 #include "engine.h"
 #include "caption_menu.h"
+#include "config_mgr.h"
+#include "text_float.h"
 #include "MainWindow.h"
 
 
+textFloat * fader::s_textFloat = NULL;
+
 
 fader::fader( FloatModel * _model, const QString & _name, QWidget * _parent ) :
 	QWidget( _parent ),
@@ -69,6 +73,10 @@ fader::fader( FloatModel * _model, const QString & _name, QWidget * _parent ) :
 	m_leds( embed::getIconPixmap( "fader_leds" ) ),
 	m_knob( embed::getIconPixmap( "fader_knob" ) )
 {
+	if( s_textFloat == NULL )
+	{
+		s_textFloat = new textFloat;
+	}
 	setAccessibleName( _name );
 	setAttribute( Qt::WA_OpaquePaintEvent, true );
 	setMinimumSize( 23, 116 );
@@ -105,6 +113,8 @@ void fader::mouseMoveEvent( QMouseEvent *ev )
 	fVal = fVal + m_model->minValue();
 
 	m_model->setValue( fVal );
+
+	updateTextFloat();
 }
 
 
@@ -115,6 +125,9 @@ void fader::mousePressEvent( QMouseEvent * _me )
 	if( _me->button() == Qt::LeftButton &&
 			! ( _me->modifiers() & Qt::ControlModifier ) )
 	{
+		updateTextFloat();
+		s_textFloat->show();
+
 		mouseMoveEvent( _me );
 		_me->accept();
 	}
@@ -126,6 +139,11 @@ void fader::mousePressEvent( QMouseEvent * _me )
 
 
 
+void fader::mouseReleaseEvent( QMouseEvent * _me )
+{
+	s_textFloat->hide();
+}
+
 
 void fader::wheelEvent ( QWheelEvent *ev )
 {
@@ -139,6 +157,8 @@ void fader::wheelEvent ( QWheelEvent *ev )
 	{
 		m_model->incValue( -5 );
 	}
+	updateTextFloat();
+	s_textFloat->setVisibilityTimeOut( 1000 );
 }
 
 
@@ -182,6 +202,19 @@ void fader::setPeak_R( float fPeak )
 	}
 }
 
+void fader::updateTextFloat()
+{
+	if( configManager::inst()->value( "app", "displaydbv" ).toInt() )
+	{
+		s_textFloat->setText( QString("Volume: %1 dBV").
+				arg( 20.0 * log10( model()->value() ), 3, 'f', 2 ) );
+	}
+	else
+	{
+		s_textFloat->setText( QString("Volume: %1 %").arg( m_model->value() * 100 ) );
+	}
+	s_textFloat->moveGlobal( this, QPoint( width() - m_knob.width() - 5, knob_y() - 46 ) );
+}