Ability to delete mixer channels in the FX Mixer

Users can now delete mixer channels from the FX mixer, and it
doesn't mess up the instrument send channels.

src/core/FxMixer.cpp

@@ -30,6 +30,9 @@
 #include "Effect.h"
 #include "song.h"
 
+#include "InstrumentTrack.h"
+#include "bb_track_container.h"
+
 
 FxChannel::FxChannel( Model * _parent ) :
 	m_fxChain( NULL ),
@@ -97,6 +100,98 @@ int FxMixer::createChannel()
 }
 
 
+void FxMixer::deleteChannel(int index)
+{
+	// go through every instrument and adjust for the channel index change
+	QVector<track *> songTrackList = engine::getSong()->tracks();
+	QVector<track *> bbTrackList = engine::getBBTrackContainer()->tracks();
+
+	QVector<track *> trackLists[] = {songTrackList, bbTrackList};
+	for(int tl=0; tl<2; ++tl)
+	{
+		QVector<track *> trackList = trackLists[tl];
+		for(int i=0; i<trackList.size(); ++i)
+		{
+			if( trackList[i]->type() == track::InstrumentTrack )
+			{
+				InstrumentTrack * inst = (InstrumentTrack *) trackList[i];
+				int val = inst->effectChannelModel()->value(0);
+				if( val == index )
+				{
+					// we are deleting this track's fx send
+					// send to master
+					inst->effectChannelModel()->setValue(0);
+				}
+				else if( val > index )
+				{
+					// subtract 1 to make up for the missing channel
+					inst->effectChannelModel()->setValue(val-1);
+				}
+
+			}
+		}
+	}
+
+	// delete all of this channel's sends and receives
+	for(int i=0; i<m_fxChannels[index]->m_sends.size(); ++i)
+	{
+		deleteChannelSend(index, m_fxChannels[index]->m_sends[i]);
+	}
+	for(int i=0; i<m_fxChannels[index]->m_receives.size(); ++i)
+	{
+		deleteChannelSend(m_fxChannels[index]->m_receives[i], index);
+	}
+
+	for(int i=0; i<m_fxChannels.size(); ++i)
+	{
+		// for every send/receive, adjust for the channel index change
+		for(int j=0; j<m_fxChannels[i]->m_sends.size(); ++j)
+		{
+			if( m_fxChannels[i]->m_sends[j] > index )
+			{
+				// subtract 1 to make up for the missing channel
+				--m_fxChannels[i]->m_sends[j];
+			}
+		}
+		for(int j=0; j<m_fxChannels[i]->m_receives.size(); ++j)
+		{
+			if( m_fxChannels[i]->m_receives[j] > index )
+			{
+				// subtract 1 to make up for the missing channel
+				--m_fxChannels[i]->m_receives[j];
+			}
+		}
+
+	}
+
+	// actually delete the channel
+	m_fxChannels.remove(index);
+}
+
+
+
+void FxMixer::moveChannelLeft(int index)
+{
+	// can't move master or first channel
+	if( index <= 1 )
+	{
+		return;
+	}
+
+	// channels to swap
+	int a = index - 1, b = index;
+
+	// go through every instrument and adjust for the channel index change
+}
+
+
+
+void FxMixer::moveChannelRight(int index)
+{
+	moveChannelLeft(index+1);
+}
+
+
 
 void FxMixer::createChannelSend(fx_ch_t fromChannel, fx_ch_t toChannel,
 								float amount)

src/gui/FxMixerView.cpp

@@ -24,6 +24,7 @@
 
 #include <QtGlobal>
 #include <QDebug>
+#include <QKeyEvent>
 
 #include <QtGui/QButtonGroup>
 #include <QtGui/QInputDialog>
@@ -63,9 +64,6 @@ FxMixerView::FxMixerView() :
 
 	// main-layout
 	QHBoxLayout * ml = new QHBoxLayout;
-	//ml->setMargin( 0 );
-	//ml->setSpacing( 0 );
-	//ml->addSpacing( 6 );
 
 	// Channel area
 	m_channelAreaWidget = new QWidget;
@@ -237,6 +235,56 @@ void FxMixerView::updateFxLine(int index)
 }
 
 
+void FxMixerView::deleteChannel(int index)
+{
+	// remember selected line
+	int selLine = m_currentFxLine->channelIndex();
+
+	// can't delete master
+	if( index == 0 )
+		return;
+
+	// delete the real channel
+	engine::fxMixer()->deleteChannel(index);
+
+	// delete the view
+	chLayout->removeWidget(m_fxChannelViews[index]->m_fxLine);
+	delete m_fxChannelViews[index]->m_fader;
+	delete m_fxChannelViews[index]->m_muteBtn;
+	delete m_fxChannelViews[index]->m_fxLine;
+	delete m_fxChannelViews[index];
+
+	// make sure every channel knows what index it is
+	for(int i=0; i<m_fxChannelViews.size(); ++i)
+	{
+		if( i > index )
+		{
+			m_fxChannelViews[i]->m_fxLine->setChannelIndex(i-1);
+		}
+	}
+	m_fxChannelViews.remove(index);
+
+	// select the next channel
+	if( selLine >= m_fxChannelViews.size() )
+	{
+		selLine = m_fxChannelViews.size()-1;
+	}
+	setCurrentFxLine(selLine);
+
+}
+
+
+void FxMixerView::keyPressEvent(QKeyEvent * e)
+{
+	switch(e->key())
+	{
+		case Qt::Key_Delete:
+			deleteChannel(m_currentFxLine->channelIndex());
+			break;
+	}
+}
+
+
 
 void FxMixerView::setCurrentFxLine( int _line )
 {
@@ -245,7 +293,6 @@ void FxMixerView::setCurrentFxLine( int _line )
 
 
 
-
 void FxMixerView::clear()
 {
 	m_rackView->clearViews();