Code review changes

Mostly whitespace and formatting changes: remove tabs, remove spaces in parameter lists, remove underscores from parameter names.

Some lines have been shortened by introducing intermediate variables, e.g. in `MixerChannelView`.

`MixerView` has many changes but only related to whitespace. Spaces have been introduced for if and for statements. Whitespace at round braces has been removed everywhere in the implementation file even if a line was not touched by the intial changes.

Remove duplicate forward declaration of `MixerChannelView`.

include/MixerChannelView.h

@@ -61,7 +61,7 @@ namespace lmms::gui
  void paintEvent(QPaintEvent* event) override;
  void contextMenuEvent(QContextMenuEvent*) override;
  void mousePressEvent(QMouseEvent*) override;
-  void mouseDoubleClickEvent(QMouseEvent*) override;
+  void mouseDoubleClickEvent(QMouseEvent*) override;
  bool eventFilter(QObject* dist, QEvent* event) override;
 
  int channelIndex() const;

include/SendButtonIndicator.h

@@ -39,14 +39,13 @@ namespace gui
 
 class MixerChannelView;
 class MixerView;
-class MixerChannelView;
 
 class SendButtonIndicator : public QLabel
 {
 public:
- SendButtonIndicator(QWidget * _parent, MixerChannelView * _owner, MixerView * _mv);
+ SendButtonIndicator(QWidget * parent, MixerChannelView * owner, MixerView * mv);
 
- void mousePressEvent( QMouseEvent * e ) override;
+ void mousePressEvent(QMouseEvent * e) override;
  void updateLightStatus();
 
 private:

src/gui/MixerChannelView.cpp

@@ -145,7 +145,7 @@ namespace lmms::gui
 
  void MixerChannelView::contextMenuEvent(QContextMenuEvent*)
  {
- auto contextMenu = new CaptionMenu( Engine::mixer()->mixerChannel( m_channelIndex )->m_name, this );
+ auto contextMenu = new CaptionMenu(Engine::mixer()->mixerChannel(m_channelIndex)->m_name, this);
 
  if (m_channelIndex != 0) // no move-options in master
  {
@@ -178,11 +178,13 @@ namespace lmms::gui
 
  void MixerChannelView::paintEvent(QPaintEvent* event)
  {
- const auto channel = Engine::mixer()->mixerChannel(m_channelIndex);
+ auto * mixer = Engine::mixer();
+ const auto channel = mixer->mixerChannel(m_channelIndex);
  const bool muted = channel->m_muteModel.value();
  const auto name = channel->m_name;
  const auto elidedName = elideName(name);
- const auto isActive = m_mixerView->currentMixerChannel() == this;
+ const auto * mixerChannelView = m_mixerView->currentMixerChannel();
+ const auto isActive = mixerChannelView == this;
 
  if (!m_inRename && m_renameLineEdit->text() != elidedName)
  {
@@ -210,8 +212,9 @@ namespace lmms::gui
  painter.setPen(isActive ? strokeOuterActive() : strokeOuterInactive());
  painter.drawRect(0, 0, width - MIXER_CHANNEL_OUTER_BORDER_SIZE, height - MIXER_CHANNEL_OUTER_BORDER_SIZE);
 
- const auto sendToThis = Engine::mixer()->channelSendModel(m_mixerView->currentMixerChannel()->m_channelIndex, m_channelIndex) != nullptr;
- const auto receiveFromThis = Engine::mixer()->channelSendModel(m_channelIndex, m_mixerView->currentMixerChannel()->m_channelIndex) != nullptr;
+ const auto & currentMixerChannelIndex = mixerChannelView->m_channelIndex;
+ const auto sendToThis = mixer->channelSendModel(currentMixerChannelIndex, m_channelIndex) != nullptr;
+ const auto receiveFromThis = mixer->channelSendModel(m_channelIndex, currentMixerChannelIndex) != nullptr;
  const auto sendReceiveStateNone = !sendToThis && !receiveFromThis;
 
  // Only one or none of them can be on
@@ -389,10 +392,13 @@ namespace lmms::gui
  void MixerChannelView::selectColor()
  {
  const auto channel = Engine::mixer()->mixerChannel(m_channelIndex);
- const auto newColor = ColorChooser{this}
- .withPalette(ColorChooser::Palette::Mixer)
- ->getColor(channel->color().value_or(backgroundActive().color()));
+
+ const auto initialColor = channel->color().value_or(backgroundActive().color());
+ const auto * colorChooser = ColorChooser{this}.withPalette(ColorChooser::Palette::Mixer);
+ const auto newColor = colorChooser->getColor(initialColor);
+
  if (!newColor.isValid()) { return; }
+
  channel->setColor(newColor);
 
  Engine::getSong()->setModified();
@@ -410,25 +416,25 @@ namespace lmms::gui
  void MixerChannelView::removeChannel()
  {
  auto mix = getGUI()->mixerView();
-  mix->deleteChannel(m_channelIndex);
+  mix->deleteChannel(m_channelIndex);
  }
 
  void MixerChannelView::removeUnusedChannels()
  {
  auto mix = getGUI()->mixerView();
-  mix->deleteUnusedChannels();
+  mix->deleteUnusedChannels();
  }
 
  void MixerChannelView::moveChannelLeft()
  {
  auto mix = getGUI()->mixerView();
-  mix->moveChannelLeft(m_channelIndex);
+  mix->moveChannelLeft(m_channelIndex);
  }
 
  void MixerChannelView::moveChannelRight()
  {
  auto mix = getGUI()->mixerView();
-  mix->moveChannelRight(m_channelIndex);
+  mix->moveChannelRight(m_channelIndex);
  }
 
  QString MixerChannelView::elideName(const QString& name)