Make some hit testing utilities of LabelTrackView static and public

src/LabelTrack.cpp

@@ -1248,7 +1248,8 @@ Track::Holder LabelTrack::Clone() const
 /// TODO: Investigate what happens with large
 /// numbers of labels, might need a binary search
 /// rather than a linear one.
-void LabelTrackView::OverGlyph(LabelTrackHit &hit, int x, int y) const
+void LabelTrackView::OverGlyph(
+   const LabelTrack &track, LabelTrackHit &hit, int x, int y)
 {
    //Determine the NEW selection.
    int result=0;
@@ -1260,7 +1261,7 @@ void LabelTrackView::OverGlyph(LabelTrackHit &hit, int x, int y) const
    hit.mMouseOverLabelRight = -1;
    hit.mEdge = 0;
 
-   const auto pTrack = FindLabelTrack();
+   const auto pTrack = &track;
    const auto &mLabels = pTrack->GetLabels();
    { int i = -1; for (const auto &labelStruct : mLabels) { ++i;
       //over left or right selection bound
@@ -1304,13 +1305,13 @@ void LabelTrackView::OverGlyph(LabelTrackHit &hit, int x, int y) const
    hit.mEdge = result;
 }
 
-int LabelTrackView::OverATextBox(int xx, int yy) const
+int LabelTrackView::OverATextBox( const LabelTrack &track, int xx, int yy )
 {
-   const auto pTrack = FindLabelTrack();
+   const auto pTrack = &track;
    const auto &mLabels = pTrack->GetLabels();
    for (int nn = (int)mLabels.size(); nn--;) {
       const auto &labelStruct = mLabels[nn];
-      if (OverTextBox(&labelStruct, xx, yy))
+      if ( OverTextBox( &labelStruct, xx, yy ) )
          return nn;
    }
 
@@ -1318,7 +1319,7 @@ int LabelTrackView::OverATextBox(int xx, int yy) const
 }
 
 // return true if the mouse is over text box, false otherwise
-bool LabelTrackView::OverTextBox(const LabelStruct *pLabel, int x, int y) const
+bool LabelTrackView::OverTextBox(const LabelStruct *pLabel, int x, int y)
 {
    if( (pLabel->xText-(mIconWidth/2) < x) &&
             (x<pLabel->xText+pLabel->width+(mIconWidth/2)) &&
@@ -1689,7 +1690,8 @@ void LabelTrackView::HandleTextDragRelease(const wxMouseEvent & evt)
    if (evt.RightUp()) {
       const auto pTrack = FindLabelTrack();
       if (HasSelection() &&
-         OverTextBox(pTrack->GetLabel(mSelIndex), evt.m_x, evt.m_y)) {
+         OverTextBox(
+            pTrack->GetLabel(mSelIndex), evt.m_x, evt.m_y)) {
          // popup menu for editing
          // TODO: handle context menus via CellularPanel?
          ShowContextMenu();
@@ -1707,7 +1709,8 @@ void LabelTrackView::HandleGlyphClick
    if (evt.ButtonDown())
    {
       //OverGlyph sets mMouseOverLabel to be the chosen label.
-      OverGlyph(hit, evt.m_x, evt.m_y);
+      const auto pTrack = FindLabelTrack();
+      OverGlyph(*pTrack, hit, evt.m_x, evt.m_y);
       hit.mIsAdjustingLabel = evt.Button(wxMOUSE_BTN_LEFT) &&
          ( hit.mEdge & 3 ) != 0;
 
@@ -1730,7 +1733,6 @@ void LabelTrackView::HandleGlyphClick
 
          // Dragging of three label edges at the same time is not supported (yet).
 
-         const auto pTrack = FindLabelTrack();
          const auto &mLabels = pTrack->GetLabels();
          if( ( hit.mMouseOverLabelRight >= 0 ) &&
              ( hit.mMouseOverLabelLeft >= 0 )
@@ -1766,9 +1768,9 @@ void LabelTrackView::HandleTextClick(const wxMouseEvent & evt,
    if (evt.ButtonDown())
    {
 
-      mSelIndex = OverATextBox(evt.m_x, evt.m_y);
+      const auto pTrack = FindLabelTrack();
+      mSelIndex = OverATextBox( *pTrack, evt.m_x, evt.m_y );
       if (mSelIndex != -1) {
-         const auto pTrack = FindLabelTrack();
          const auto &mLabels = pTrack->GetLabels();
          const auto &labelStruct = mLabels[mSelIndex];
          *newSel = labelStruct.selectedRegion;

src/tracks/labeltrack/ui/LabelGlyphHandle.cpp

@@ -103,7 +103,7 @@ UIHandlePtr LabelGlyphHandle::HitTest
    // LabelGlyphHandle can be copyable:
    auto pHit = std::make_shared<LabelTrackHit>( pLT );
 
-   LabelTrackView::Get( *pLT ).OverGlyph(*pHit, state.m_x, state.m_y);
+   LabelTrackView::OverGlyph(*pLT, *pHit, state.m_x, state.m_y);
 
    // IF edge!=0 THEN we've set the cursor and we're done.
    // signal this by setting the tip.

src/tracks/labeltrack/ui/LabelTextHandle.cpp

@@ -55,8 +55,8 @@ UIHandlePtr LabelTextHandle::HitTest
    // If Control is down, let the select handle be hit instead
    int labelNum;
    if (!state.ControlDown() &&
-       (labelNum = LabelTrackView::Get( *pLT ).
-          OverATextBox(state.m_x, state.m_y) ) >= 0) {
+       (labelNum =
+          LabelTrackView::OverATextBox(*pLT, state.m_x, state.m_y) ) >= 0) {
       auto result = std::make_shared<LabelTextHandle>( pLT, labelNum );
       result = AssignUIHandlePtr(holder, result);
       return result;
@@ -137,7 +137,7 @@ UIHandle::Result LabelTextHandle::Drag
 
          if (pLT &&
             (pView->GetSelectedIndex() != -1) &&
-             pView->OverTextBox(
+             LabelTrackView::OverTextBox(
                pLT->GetLabel(pView->GetSelectedIndex()),
                mLabelTrackStartXPos,
                mLabelTrackStartYPos))

src/tracks/labeltrack/ui/LabelTrackView.h

@@ -110,9 +110,10 @@ public:
    bool CopySelectedText();
    bool PasteSelectedText(double sel0, double sel1);
 
-private:
-   void OverGlyph(LabelTrackHit &hit, int x, int y) const;
+   static void OverGlyph(
+      const LabelTrack &track, LabelTrackHit &hit, int x, int y );
 
+private:
    static wxBitmap & GetGlyph( int i);
 
    struct Flags {
@@ -130,9 +131,12 @@ private:
    }
    void RestoreFlags( const Flags& flags );
 
-   int OverATextBox(int xx, int yy) const;
-   bool OverTextBox(const LabelStruct *pLabel, int x, int y) const;
+public:
+   static int OverATextBox( const LabelTrack &track, int xx, int yy );
 
+   static bool OverTextBox( const LabelStruct *pLabel, int x, int y );
+
+private:
    static bool IsTextClipSupported();
    
    void HandleGlyphClick