AdornedRulerPanel.cpp

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  AdornedRulerPanel.cpp
 
  Dominic Mazzoni
 
*******************************************************************//******************************************************************/
 
 
#include "AdornedRulerPanel.h"
 
#include <wx/app.h>
#include <wx/setup.h> // for wxUSE_* macros
#include <wx/tooltip.h>
 
#include "AColor.h"
#include "AllThemeResources.h"
#include "AudioIO.h"
#include "widgets/BasicMenu.h"
#include "Beats.h"
#include "CellularPanel.h"
#include "../images/Cursors.h"
#include "HitTestResult.h"
#include "Prefs.h"
#include "Project.h"
#include "ProjectAudioIO.h"
#include "ProjectAudioManager.h"
#include "ProjectWindows.h"
#include "ProjectStatus.h"
#include "ProjectTimeRuler.h"
#include "ProjectTimeSignature.h"
#include "ProjectWindow.h"
#include "RefreshCode.h"
#include "SelectUtilities.h"
#include "Snap.h"
#include "Track.h"
#include "TrackPanelMouseEvent.h"
#include "UIHandle.h"
#include "ViewInfo.h"
#include "prefs/TracksPrefs.h"
#include "prefs/ThemePrefs.h"
#include "toolbars/ToolBar.h"
#include "toolbars/ToolManager.h"
#include "tracks/ui/Scrubbing.h"
#include "tracks/ui/ChannelView.h"
#include "widgets/AButton.h"
#include "AudacityMessageBox.h"
#include "widgets/Grabber.h"
#include "widgets/LinearUpdater.h"
#include "widgets/BeatsFormat.h"
#include "widgets/TimeFormat.h"
#include "wxWidgetsWindowPlacement.h"
 
#include <wx/dcclient.h>
#include <wx/menu.h>
 
using std::min;
using std::max;
 
//#define SCRUB_ABOVE
 
#define SELECT_TOLERANCE_PIXEL 4
 
#define PLAY_REGION_TRIANGLE_SIZE 6
#define PLAY_REGION_RECT_WIDTH 1
#define PLAY_REGION_RECT_HEIGHT 3
#define PLAY_REGION_GLOBAL_OFFSET_Y 7
 
enum : int {
   IndicatorSmallWidth = 9,
   IndicatorMediumWidth = 13,
   IndicatorOffset = 1,
 
   TopMargin = 1,
   BottomMargin = 2, // for bottom bevel and bottom line
   LeftMargin = 1, 
 
   RightMargin = 1,
};
 
enum {
   ScrubHeight = 14,
   ProperRulerHeight = 29
};
 
inline int IndicatorHeightForWidth(int width)
{
   return ((width / 2) * 3) / 2;
}
 
inline int IndicatorWidthForHeight(int height)
{
   // Not an exact inverse of the above, with rounding, but good enough
   return std::max(static_cast<int>(IndicatorSmallWidth),
                   (((height) * 2) / 3) * 2
                   );
}
 
inline int IndicatorBigHeight()
{
   return std::max((int)(ScrubHeight - TopMargin),
                   (int)(IndicatorMediumWidth));
}
 
inline int IndicatorBigWidth()
{
   return IndicatorWidthForHeight(IndicatorBigHeight());
}
 
class AdornedRulerPanel::CommonRulerHandle : public UIHandle
{
public:
   CommonRulerHandle(
      AdornedRulerPanel *pParent, wxCoord xx, MenuChoice menuChoice )
      : mParent(pParent)
      , mX( xx )
      , mClickedX( xx )
      , mChoice( menuChoice )
   {}
 
   std::shared_ptr<const Channel> FindChannel() const override
   { return nullptr; }
 
   bool Clicked() const { return mClicked != Button::None; }
 
   static UIHandle::Result NeedChangeHighlight(
      const CommonRulerHandle &oldState, const CommonRulerHandle &newState)
   {
      if (oldState.mX != newState.mX)
         return RefreshCode::DrawOverlays;
      return 0;
   }
 
protected:
   bool HandlesRightClick() override { return true; }
 
   Result Click(
      const TrackPanelMouseEvent &event, AudacityProject *) override
   {
      mClicked = event.event.LeftIsDown() ? Button::Left : Button::Right;
      mClickedX = event.event.GetX();
      return RefreshCode::DrawOverlays;
   }
 
   Result Drag(
      const TrackPanelMouseEvent &, AudacityProject *) override
   {
      return RefreshCode::DrawOverlays;
   }
 
   Result Release(
      const TrackPanelMouseEvent &event, AudacityProject *,
      wxWindow *) override
   {
      if ( mParent && mClicked == Button::Right ) {
         const auto pos = event.event.GetPosition();
         mParent->ShowContextMenu( mChoice, &pos );
      }
      return RefreshCode::DrawOverlays;
   }
 
   double Time(AudacityProject &project) const
   {
      auto &viewInfo = ViewInfo::Get(project);
      return viewInfo.PositionToTime(mX, viewInfo.GetLeftOffset());
   }
 
   // Danger!  `this` may be deleted!
   void StartPlay(AudacityProject &project, const wxMouseEvent &event)
   {
      auto &ruler = AdornedRulerPanel::Get(project);
   
      // Keep a shared pointer to self.  Otherwise *this might get deleted
      // in HandleQPRelease on Windows!  Because there is an event-loop yield
      // stopping playback, which caused OnCaptureLost to be called, which caused
      // clearing of CellularPanel targets!
      auto saveMe = ruler.Target();
 
      const auto startTime = Time(project);
      ruler.StartQPPlay(!event.ShiftDown(), false, &startTime);
   }
 
   Result Cancel(AudacityProject *) override
   {
      return RefreshCode::DrawOverlays;
   }
   
   void Enter(bool, AudacityProject *) override
   {
      mChangeHighlight = RefreshCode::DrawOverlays;
   }
 
   wxWeakRef<AdornedRulerPanel> mParent;
 
   wxCoord mX;
   wxCoord mClickedX;
   
   MenuChoice mChoice;
 
   enum class Button { None, Left, Right };
   Button mClicked{ Button::None };
};
 
class AdornedRulerPanel::PlayRegionAdjustingHandle : public CommonRulerHandle {
public:
   PlayRegionAdjustingHandle(
      AdornedRulerPanel *pParent, wxCoord xx, MenuChoice menuChoice,
      wxCursor *cursor,
      size_t numGuides = 1)
   : CommonRulerHandle{ pParent, xx, menuChoice }
   , mNumGuides{ numGuides }
   {
      if (cursor) {
         mCursor = *cursor;
      }
   }
 
   PlayRegionAdjustingHandle(
      AdornedRulerPanel *pParent, wxCoord xx, MenuChoice menuChoice,
      wxCursor cursor,
      size_t numGuides = 1)
   : CommonRulerHandle{ pParent, xx, menuChoice }
   , mCursor{ cursor }
   , mNumGuides{ numGuides }
   {}
 
   void SetCursor(wxCursor cursor)
   {
      mCursor = cursor;
   }
 
   HitTestPreview Preview(
      const TrackPanelMouseState &state, AudacityProject *pProject)
   override
   {
      mParent->SetNumGuides(mNumGuides);
      const auto message = XO("Click and drag to define a looping region.");
      return {
         message,
         &mCursor,
         message
      };
   }
 
   Result Drag(
      const TrackPanelMouseEvent &event, AudacityProject *pProject) override
   {
      using namespace RefreshCode;
      auto result = CommonRulerHandle::Drag(event, pProject);
      if (0 != (result & Cancelled) || mClicked != Button::Left)
         return result;
 
      auto &ruler = AdornedRulerPanel::Get(*pProject);
      mX = event.event.m_x;
      ruler.UpdateQuickPlayPos(event.event.m_x);
   
      if (!mDragged) {
         if (fabs(mX - mClickedX) < SELECT_TOLERANCE_PIXEL)
            // Don't start a drag yet for a small mouse movement
            return RefreshNone;
         SavePlayRegion(*pProject);
         const auto time = SnappedTime(*pProject, 0);
         DoStartAdjust(*pProject, time);
         mDragged = true;
      }
      else
         DoAdjust(*pProject);
 
      if (AdornedRulerPanel::Get( *pProject ).mPlayRegionDragsSelection)
         DragSelection(*pProject);
 
      return RefreshAll;
   }
  
   Result Release(
      const TrackPanelMouseEvent &event,
      AudacityProject *pProject, wxWindow *pParent)
   override
   {
      using namespace RefreshCode;
      auto result = CommonRulerHandle::Release(event, pProject, pParent);
 
      if (mClicked == Button::Left && !mDragged)
         StartPlay(*pProject, event.event);
 
      if (!mDragged || 0 != (result & Cancelled))
         return result;
 
      // Set the play region endpoints correctly even if not strictly needed
      auto &viewInfo = ViewInfo::Get( *pProject );
      auto &playRegion = viewInfo.playRegion;
      playRegion.Order();
 
      return result;
   }
 
   Result Cancel(AudacityProject *pProject) override
   {
      using namespace RefreshCode;
      auto result = CommonRulerHandle::Cancel(pProject);
      if (!mSaved)
         return result;
 
      auto &viewInfo = ViewInfo::Get(*pProject);
      viewInfo.selectedRegion = mOldSelectedRegion;
      auto &playRegion = viewInfo.playRegion;
      playRegion.SetTimes(mOldStart, mOldEnd);
      if (!mWasActive)
         playRegion.SetActive(false);
   
      return RefreshAll;
   }
 
   // Compare with class SelectHandle.  Perhaps a common base class for that
   // class too should be defined.
   bool HasEscape(AudacityProject *pProject) const override
   {
      auto &ruler = AdornedRulerPanel::Get(*pProject);
      auto values = ruler.mIsSnapped;
      auto identity = [](auto x){ return x; }; // in the C++20 standard...
      return std::any_of( values, values + ruler.mNumGuides, identity );
   }
 
   bool Escape(AudacityProject *pProject) override
   {
      if (HasEscape(pProject)) {
         Unsnap(false, pProject);
         return true;
      }
      return false;
   }
 
protected:
 
   double SnappedTime( AudacityProject &project, size_t ii )
   {
      const auto &ruler = AdornedRulerPanel::Get(project);
      bool isSnapped = ruler.mIsSnapped[ii];
      return isSnapped
         ? ruler.mQuickPlayPos[ii]
         : ruler.mQuickPlayPosUnsnapped[ii];
   }
 
   std::pair<double, double> SnappedTimes( AudacityProject &project )
   {
      const auto &ruler = AdornedRulerPanel::Get(project);
      for (size_t ii = 0; ii < ruler.mNumGuides; ++ii)
         if (ruler.mIsSnapped[ii]) {
            double time0 = ruler.mQuickPlayPos[ii];
            double delta = time0 - ruler.mQuickPlayPosUnsnapped[ii];
            double time1 = ruler.mQuickPlayPosUnsnapped[1 - ii] + delta;
            if (ii == 1)
               return { time1, time0 };
            else
               return { time0, time1 };
         }
      // No snap
      return { ruler.mQuickPlayPos[0], ruler.mQuickPlayPos[1] };
   }
 
   void Unsnap(bool use, AudacityProject *pProject)
   {
      auto &ruler = AdornedRulerPanel::Get(*pProject);
      std::fill( ruler.mIsSnapped, ruler.mIsSnapped + ruler.mNumGuides, false );
      // Repaint to turn the snap lines on or off
      mChangeHighlight = RefreshCode::RefreshAll;
      if (Clicked())
         DoAdjust(*pProject);
   }
 
   virtual void DoStartAdjust(AudacityProject &, double) = 0;
   virtual void DoAdjust(AudacityProject &) = 0;
 
   void SavePlayRegion(AudacityProject &project)
   {
      auto &viewInfo = ViewInfo::Get(project);
      mOldSelectedRegion = viewInfo.selectedRegion;
      auto &playRegion = viewInfo.playRegion;
      mWasActive = playRegion.Active();
      mOldStart = playRegion.GetLastActiveStart();
      mOldEnd = playRegion.GetLastActiveEnd();
      if (!mWasActive)
         playRegion.SetActive(true);
      mSaved = true;
   }
 
private:
   // wxCursor is a cheaply copied reference-counting handle to a resource
   wxCursor mCursor;
   size_t mNumGuides;
 
   SelectedRegion mOldSelectedRegion;
   double mOldStart = 0.0, mOldEnd = 0.0;
   bool mWasActive = false;
   bool mSaved = false;
   bool mDragged = false;
};
 
/**********************************************************************
 
ScrubbingRulerOverlay.
Graphical helper for AdornedRulerPanel.
 
**********************************************************************/
 
class TrackPanelGuidelineOverlay;
 
// This is an overlay drawn on the ruler.
class AdornedRulerPanel::ScrubbingRulerOverlay final : public Overlay
{
public:
   ScrubbingRulerOverlay(TrackPanelGuidelineOverlay &partner);
 
   int mNewQPIndicatorPos { -1 };
   int mNewIndicatorSnapped { -1 };
 
   bool mNewScrub {};
   bool mNewSeek {};
 
   void Update();
 
private:
   AdornedRulerPanel *GetRuler() const;
 
   unsigned SequenceNumber() const override;
 
   std::pair<wxRect, bool> DoGetRectangle(wxSize size) override;
   void Draw(OverlayPanel &panel, wxDC &dc) override;
 
   TrackPanelGuidelineOverlay &mPartner;
 
   // Used by this only
   int mOldQPIndicatorPos { -1 };
   bool mOldScrub {};
   bool mOldSeek {};
};
 
/**********************************************************************
 
 TrackPanelGuidelineOverlay.
 Updated for mouse events in AdornedRulerPanel, but draws on the TrackPanel.
 
 **********************************************************************/
 
// This is an overlay drawn on a different window, the track panel.
// It draws the pale guide line that follows mouse movement.
class AdornedRulerPanel::TrackPanelGuidelineOverlay final : public Overlay
{
   friend ScrubbingRulerOverlay;
   friend AdornedRulerPanel;
 
public:
   TrackPanelGuidelineOverlay(AudacityProject *project);
 
private:
   void Update();
 
   unsigned SequenceNumber() const override;
   std::pair<wxRect, bool> DoGetRectangle(wxSize size) override;
   void Draw(OverlayPanel &panel, wxDC &dc) override;
 
   AudacityProject *mProject;
 
   std::shared_ptr<ScrubbingRulerOverlay> mPartner
      { std::make_shared<ScrubbingRulerOverlay>(*this) };
 
   bool mNewPreviewingScrub {};
 
   int mOldQPIndicatorPos { -1 };
   int mOldIndicatorSnapped { -1 };
   bool mOldPreviewingScrub {};
};
 
/**********************************************************************
 
 Implementation of ScrubbingRulerOverlay.
 
 **********************************************************************/
 
AdornedRulerPanel::ScrubbingRulerOverlay::ScrubbingRulerOverlay(
   TrackPanelGuidelineOverlay &partner)
: mPartner(partner)
{
}
 
AdornedRulerPanel *AdornedRulerPanel::ScrubbingRulerOverlay::GetRuler() const
{
   return &Get( *mPartner.mProject );
}
 
void AdornedRulerPanel::ScrubbingRulerOverlay::Update()
{
   const auto project = mPartner.mProject;
   auto &scrubber = Scrubber::Get( *project );
   auto ruler = GetRuler();
 
   bool scrubbing = (scrubber.IsScrubbing()
      && !scrubber.IsSpeedPlaying()
      && !scrubber.IsKeyboardScrubbing());
 
   // Hide during transport, or if mouse is not in the ruler, unless scrubbing
   if ((!ruler->LastCell() || ProjectAudioIO::Get( *project ).IsAudioActive())
       && !scrubbing)
      mNewQPIndicatorPos = -1;
   else {
      const auto &selectedRegion = ViewInfo::Get( *project ).selectedRegion;
      double latestEnd =
         std::max(ruler->mTracks->GetEndTime(), selectedRegion.t1());
      // This will determine the x coordinate of the line and of the
      // ruler indicator
 
      // Test all snap points
      mNewIndicatorSnapped = -1;
      for (size_t ii = 0;
           mNewIndicatorSnapped == -1 && ii < ruler->mNumGuides; ++ii) {
         if (ruler->mIsSnapped[ii]) {
            mNewIndicatorSnapped = ii;
         }
      }
      mNewQPIndicatorPos = ruler->Time2Pos(
         ruler->mQuickPlayPos[std::max(0, mNewIndicatorSnapped)]);
 
      // These determine which shape is drawn on the ruler, and whether
      // in the scrub or the qp zone
      mNewScrub =
         !ruler->IsMouseCaptured() && // not doing some other drag in the ruler
         (ruler->LastCell() == ruler->mScrubbingCell ||
          (scrubber.HasMark()));
      mNewSeek = mNewScrub &&
         (scrubber.Seeks() || scrubber.TemporarilySeeks());
   }
}
 
unsigned
AdornedRulerPanel::ScrubbingRulerOverlay::SequenceNumber() const
{
   return 30;
}
 
std::pair<wxRect, bool>
AdornedRulerPanel::ScrubbingRulerOverlay::DoGetRectangle(wxSize /*size*/)
{
   Update();
 
   const auto x = mOldQPIndicatorPos;
   if (x >= 0) {
      // These dimensions are always sufficient, even if a little
      // excessive for the small triangle:
      const int width = IndicatorBigWidth() * 3 / 2;
      //const auto height = IndicatorHeightForWidth(width);
 
      const int indsize = width / 2;
 
      auto xx = x - indsize;
      auto yy = 0;
      return {
         { xx, yy,
            indsize * 2 + 1,
            GetRuler()->GetSize().GetHeight() },
         (x != mNewQPIndicatorPos
          || (mOldScrub != mNewScrub)
          || (mOldSeek != mNewSeek) )
      };
   }
   else
      return { {}, mNewQPIndicatorPos >= 0 };
}
 
void AdornedRulerPanel::ScrubbingRulerOverlay::Draw(
   OverlayPanel & /*panel*/, wxDC &dc)
{
   mOldQPIndicatorPos = mNewQPIndicatorPos;
   mOldScrub = mNewScrub;
   mOldSeek = mNewSeek;
   if (mOldQPIndicatorPos >= 0) {
      auto ruler = GetRuler();
      auto width = mOldScrub ? IndicatorBigWidth() : IndicatorSmallWidth;
      ruler->DoDrawScrubIndicator(
         &dc, mOldQPIndicatorPos, width, mOldScrub, mOldSeek);
   }
}
 
/**********************************************************************
 
 Implementation of TrackPanelGuidelineOverlay.
 
 **********************************************************************/
 
AdornedRulerPanel::TrackPanelGuidelineOverlay::TrackPanelGuidelineOverlay(
   AudacityProject *project)
   : mProject(project)
{
}
 
unsigned
AdornedRulerPanel::TrackPanelGuidelineOverlay::SequenceNumber() const
{
   return 30;
}
 
void AdornedRulerPanel::TrackPanelGuidelineOverlay::Update()
{
   const auto project = mProject;
   auto &scrubber = Scrubber::Get( *project );
   const auto ruler = &Get( *project );
 
   // Determine the color of the line stroked over
   // the track panel, green for scrub or yellow for snapped or white
   mNewPreviewingScrub =
      ruler->LastCell() == ruler->mScrubbingCell &&
      !scrubber.IsScrubbing();
}
 
std::pair<wxRect, bool>
AdornedRulerPanel::TrackPanelGuidelineOverlay::DoGetRectangle(wxSize size)
{
   Update();
 
   wxRect rect(mOldQPIndicatorPos, 0, 1, size.GetHeight());
   return std::make_pair(
      rect,
      (mOldQPIndicatorPos != mPartner->mNewQPIndicatorPos ||
       mOldIndicatorSnapped != mPartner->mNewIndicatorSnapped ||
       mOldPreviewingScrub != mNewPreviewingScrub)
   );
}
 
void AdornedRulerPanel::TrackPanelGuidelineOverlay::Draw(
   OverlayPanel &panel, wxDC &dc)
{
   mOldQPIndicatorPos = mPartner->mNewQPIndicatorPos;
   mOldIndicatorSnapped = mPartner->mNewIndicatorSnapped;
   mOldPreviewingScrub = mNewPreviewingScrub;
 
   if (mOldQPIndicatorPos >= 0) {
      if (!mOldPreviewingScrub && mOldIndicatorSnapped < 0) {
         auto &ruler = AdornedRulerPanel::Get(*mProject);
         if (auto pHandle =
             dynamic_cast<PlayRegionAdjustingHandle*>(ruler.Target().get());
             pHandle != nullptr && pHandle->Clicked())
            // Do not draw the quick-play guideline
            return;
      }
   
      mOldPreviewingScrub
         ? AColor::IndicatorColor(&dc, true) // Draw green line for preview.
         : (mOldIndicatorSnapped >= 0)
            ? AColor::SnapGuidePen(&dc) // Yellow snap guideline
            : AColor::Light(&dc, false);
 
      // Draw indicator in all visible tracks
      auto pCellularPanel = dynamic_cast<CellularPanel*>( &panel );
      if ( !pCellularPanel ) {
         wxASSERT( false );
         return;
      }
      pCellularPanel
         ->VisitCells( [&]( const wxRect &rect, TrackPanelCell &cell ) {
            const auto pChannelView = dynamic_cast<ChannelView*>(&cell);
            if (!pChannelView)
               return;
 
            // Draw the NEW indicator in its NEW location
            AColor::Line(dc,
               mOldQPIndicatorPos,
               rect.GetTop(),
               mOldQPIndicatorPos,
               rect.GetBottom());
      } );
   }
}
 
/**********************************************************************
 
  Implementation of AdornedRulerPanel.
  Either we find a way to make this more generic, Or it will move
  out of the widgets subdirectory into its own source file.
 
**********************************************************************/
 
enum {
   OnMinutesAndSecondsID = 7000,
   OnBeatsAndMeasuresID,
   OnSyncQuickPlaySelID,
   OnAutoScrollID,
   OnTogglePlayRegionID,
   OnClearPlayRegionID,
   OnSetPlayRegionToSelectionID,
   OnTogglePinnedStateID,
};
 
BEGIN_EVENT_TABLE(AdornedRulerPanel, CellularPanel)
   EVT_IDLE( AdornedRulerPanel::OnIdle )
   EVT_PAINT(AdornedRulerPanel::OnPaint)
   EVT_SIZE(AdornedRulerPanel::OnSize)
   EVT_LEAVE_WINDOW(AdornedRulerPanel::OnLeave)
 
   // Context menu commands
   EVT_MENU(OnMinutesAndSecondsID, AdornedRulerPanel::OnTimelineFormatChange)
   EVT_MENU(OnBeatsAndMeasuresID, AdornedRulerPanel::OnTimelineFormatChange)
   EVT_MENU(OnSyncQuickPlaySelID, AdornedRulerPanel::OnSyncSelToQuickPlay)
   EVT_MENU(OnAutoScrollID, AdornedRulerPanel::OnAutoScroll)
   EVT_MENU(OnTogglePlayRegionID, AdornedRulerPanel::OnTogglePlayRegion)
   EVT_MENU(OnClearPlayRegionID, AdornedRulerPanel::OnClearPlayRegion)
   EVT_MENU(OnSetPlayRegionToSelectionID,
      AdornedRulerPanel::OnSetPlayRegionToSelection)
   EVT_MENU( OnTogglePinnedStateID, AdornedRulerPanel::OnTogglePinnedState )
 
   EVT_COMMAND( OnTogglePinnedStateID,
               wxEVT_COMMAND_BUTTON_CLICKED,
               AdornedRulerPanel::OnPinnedButton )
 
END_EVENT_TABLE()
 
class AdornedRulerPanel::CommonCell : public TrackPanelCell
{
public:
   explicit
   CommonCell( AdornedRulerPanel *parent, MenuChoice menuChoice )
   : mParent{ parent }
   , mMenuChoice{ menuChoice }
   {}
   
   HitTestPreview DefaultPreview(
      const TrackPanelMouseState &, const AudacityProject *)
      override
   {
      // May come here when recording is in progress, so hit tests are turned
      // off.
      TranslatableString tooltip;
      if (mParent->mTimelineToolTip)
         tooltip = XO("Timeline actions disabled during recording");
 
      static wxCursor cursor{ wxCURSOR_DEFAULT };
      return {
         {},
         &cursor,
         tooltip,
      };
   }
 
   unsigned DoContextMenu(
      const wxRect &,
      wxWindow *, const wxPoint *pPosition, AudacityProject*) final
   {
      mParent->ShowContextMenu(mMenuChoice, pPosition);
      return 0;
   }
 
protected:
   AdornedRulerPanel *mParent;
   const MenuChoice mMenuChoice;
};
 
#undef QUICK_PLAY_HANDLE
#ifdef QUICK_PLAY_HANDLE
class AdornedRulerPanel::QPHandle final : public CommonRulerHandle
{
public:
   explicit
   QPHandle( AdornedRulerPanel *pParent, wxCoord xx )
   : CommonRulerHandle( pParent, xx, MenuChoice::QuickPlay )
   {
   }
   
private:
   Result Click(
      const TrackPanelMouseEvent &event, AudacityProject *pProject) override;
 
   Result Drag(
      const TrackPanelMouseEvent &event, AudacityProject *pProject) override;
 
   HitTestPreview Preview(
      const TrackPanelMouseState &state, AudacityProject *pProject)
   override;
 
   Result Release(
      const TrackPanelMouseEvent &event, AudacityProject *pProject,
      wxWindow *pParent) override;
 
   Result Cancel(AudacityProject *pProject) override;
 
   SelectedRegion mOldSelection;
};
#endif
 
static std::unique_ptr<wxCursor> handOpenCursor = nullptr;
 
class AdornedRulerPanel::MovePlayRegionHandle final : public PlayRegionAdjustingHandle {
public:
   MovePlayRegionHandle( AdornedRulerPanel *pParent, wxCoord xx )
   : PlayRegionAdjustingHandle( pParent, xx, MenuChoice::QuickPlay, handOpenCursor.get(), 2 )
   {
      if (!handOpenCursor) {
         handOpenCursor = MakeCursor(wxCURSOR_HAND, RearrangeCursorXpm, 16, 16);
         SetCursor(*handOpenCursor);
      }
   }
 
   ~MovePlayRegionHandle()
   {
      mParent->mQuickPlayOffset[0] = 0;
      mParent->mQuickPlayOffset[1] = 0;
   }
   
private:
   void DoStartAdjust(AudacityProject &project, double) override
   {
      // Ignore the snapping of the time at the mouse
      const auto time = Time(project);
      auto &playRegion = ViewInfo::Get(project).playRegion;
      mParent->mQuickPlayOffset[0] = playRegion.GetStart() - time;
      mParent->mQuickPlayOffset[1] = playRegion.GetEnd() - time;
   }
 
   void DoAdjust(AudacityProject &project) override
   {
      // Move the whole play region rigidly (usually)
      // though the length might change slightly if only one edge snaps
      const auto times = SnappedTimes(project);
 
      auto &playRegion = ViewInfo::Get(project).playRegion;
      playRegion.SetTimes(times.first, times.second);
   }
};
 
class AdornedRulerPanel::ResizePlayRegionHandle final : public PlayRegionAdjustingHandle {
public:
   ResizePlayRegionHandle(
      AdornedRulerPanel *pParent, wxCoord xx, bool hitLeft )
   : PlayRegionAdjustingHandle( pParent, xx, MenuChoice::QuickPlay, {wxCURSOR_SIZEWE} )
   , mHitLeft{ hitLeft }
   {
   }
   
private:
   void DoStartAdjust(AudacityProject &project, double time) override
   {
   }
 
   void DoAdjust(AudacityProject &project) override
   {
      const auto time = SnappedTime(project, 0);
 
      // Change the play region
      // The check whether this new time should be start or end isn't
      // important.  The accessors for PlayRegion use min and max of stored
      // values.
      auto &playRegion = ViewInfo::Get(project).playRegion;
      if (mHitLeft)
         playRegion.SetStart(time);
      else
         playRegion.SetEnd(time);
   }
 
   bool mHitLeft = false;
};
 
class AdornedRulerPanel::NewPlayRegionHandle final : public PlayRegionAdjustingHandle {
public:
   NewPlayRegionHandle( AdornedRulerPanel *pParent, wxCoord xx )
   : PlayRegionAdjustingHandle( pParent, xx, MenuChoice::QuickPlay, {wxCURSOR_DEFAULT} )
   {
   }
   
private:
   void DoStartAdjust(AudacityProject &project, double time) override
   {
      auto &playRegion = ViewInfo::Get(project).playRegion;
      playRegion.SetTimes(time, time);
   }
 
   void DoAdjust(AudacityProject &project) override
   {
      const auto time = SnappedTime(project, 0);
 
      // Change the play region
      // The check whether this new time should be start or end isn't
      // important.  The accessors for PlayRegion use min and max of stored
      // values.
      auto &playRegion = ViewInfo::Get(project).playRegion;
      playRegion.SetEnd(time);
   }
};
 
namespace
{
 
wxCoord GetPlayHeadX( const AudacityProject *pProject )
{
   const auto &viewInfo = ViewInfo::Get( *pProject );
   auto width = viewInfo.GetTracksUsableWidth();
   return viewInfo.GetLeftOffset()
      + width * TracksPrefs::GetPinnedHeadPositionPreference();
}
 
double GetPlayHeadFraction( const AudacityProject *pProject, wxCoord xx )
{
   const auto &viewInfo = ViewInfo::Get( *pProject );
   auto width = viewInfo.GetTracksUsableWidth();
   auto fraction = (xx - viewInfo.GetLeftOffset()) / double(width);
   return std::max(0.0, std::min(1.0, fraction));
}
 
// Handle for dragging the pinned play head, which so far does not need
// to be a friend of the AdornedRulerPanel class, so we don't make it nested.
class PlayheadHandle : public UIHandle
{
public:
   PlayheadHandle( AdornedRulerPanel &parent, wxCoord xx )
      : mpParent{ &parent }
      , mX( xx )
   {}
 
   std::shared_ptr<const Channel> FindChannel() const override
   { return nullptr; }
 
   static UIHandle::Result NeedChangeHighlight(
      const PlayheadHandle &oldState, const PlayheadHandle &newState)
   {
      if (oldState.mX != newState.mX)
         return RefreshCode::DrawOverlays;
      return 0;
   }
   
   static std::shared_ptr<PlayheadHandle>
   HitTest(
      const AudacityProject *pProject, AdornedRulerPanel &parent, wxCoord xx )
   {
      if( Scrubber::Get( *pProject )
         .IsTransportingPinned() &&
          ProjectAudioIO::Get( *pProject ).IsAudioActive() )
      {
         const auto targetX = GetPlayHeadX( pProject );
         if ( abs( xx - targetX ) <= SELECT_TOLERANCE_PIXEL )
            return std::make_shared<PlayheadHandle>( parent, xx );
      }
      return {};
   }
   
protected:
   Result Click(
      const TrackPanelMouseEvent &event, AudacityProject *) override
   {
      if (event.event.LeftDClick()) {
         // Restore default position on double click
         TracksPrefs::SetPinnedHeadPositionPreference( 0.5, true );
      
         return RefreshCode::DrawOverlays |
            // Do not start a drag
            RefreshCode::Cancelled;
      }
      // Fix for Bug 2357
      if (!event.event.LeftIsDown())
         return RefreshCode::Cancelled;
 
      mOrigPreference = TracksPrefs::GetPinnedHeadPositionPreference();
      return 0;
   }
 
   Result Drag(
      const TrackPanelMouseEvent &event, AudacityProject *pProject) override
   {
 
      auto value = GetPlayHeadFraction(pProject, event.event.m_x );
      TracksPrefs::SetPinnedHeadPositionPreference( value );
      return RefreshCode::DrawOverlays;
   }
 
   HitTestPreview Preview(
      const TrackPanelMouseState &, AudacityProject *)
      override
   {
      mpParent->SetNumGuides(1);
      static wxCursor cursor{ wxCURSOR_SIZEWE };
      return {
         XO( "Click and drag to adjust, double-click to reset" ),
         &cursor,
         /* i18n-hint: This text is a tooltip on the icon (of a pin) representing 
         the temporal position in the audio.  */
         XO( "Record/Play head" )
      };
   }
 
   Result Release(
      const TrackPanelMouseEvent &event, AudacityProject *pProject,
      wxWindow *) override
   {
      auto value = GetPlayHeadFraction(pProject, event.event.m_x );
      TracksPrefs::SetPinnedHeadPositionPreference( value, true );
      return RefreshCode::DrawOverlays;
   }
 
   Result Cancel(AudacityProject *) override
   {
      TracksPrefs::SetPinnedHeadPositionPreference( mOrigPreference );
      return RefreshCode::DrawOverlays;
   }
   
   void Enter(bool, AudacityProject *) override
   {
      mChangeHighlight = RefreshCode::DrawOverlays;
   }
 
   AdornedRulerPanel *mpParent;
   wxCoord mX;
   double mOrigPreference {};
};
 
}
 
class AdornedRulerPanel::QPCell final : public CommonCell
{
public:
   explicit
   QPCell( AdornedRulerPanel *parent )
   : AdornedRulerPanel::CommonCell{ parent, MenuChoice::QuickPlay }
   {}
   
   std::vector<UIHandlePtr> HitTest(
      const TrackPanelMouseState &state,
      const AudacityProject *pProject) override;
   
   // Return shared_ptr to self, stored in parent
   std::shared_ptr<TrackPanelCell> ContextMenuDelegate() override
      { return mParent->mQPCell; }
 
   bool Clicked() const {
#ifdef QUICK_PLAY_HANDLE
      if (auto ptr = mHolder.lock())
         return ptr->Clicked();
#endif
      return false;
   }
   
#ifdef QUICK_PLAY_HANDLE
   std::weak_ptr<QPHandle> mHolder;
#endif
 
   std::weak_ptr<ResizePlayRegionHandle> mResizePlayRegionHolder;
   std::weak_ptr<MovePlayRegionHandle> mMovePlayRegionHolder;
   std::weak_ptr<NewPlayRegionHandle> mNewPlayRegionHolder;
   std::weak_ptr<PlayheadHandle> mPlayheadHolder;
};
 
std::vector<UIHandlePtr> AdornedRulerPanel::QPCell::HitTest(
   const TrackPanelMouseState &state,
   const AudacityProject *pProject)
{
   // Creation of overlays on demand here -- constructor of AdornedRulerPanel
   // is too early to do it
   mParent->CreateOverlays();
   
   std::vector<UIHandlePtr> results;
   auto xx = state.state.m_x;
 
#ifdef EXPERIMENTAL_DRAGGABLE_PLAY_HEAD
   {
      // Allow click and drag on the play head even while recording
      // Make this handle more prominent then the quick play handle
      auto result = PlayheadHandle::HitTest( pProject, *mParent, xx );
      if (result) {
         result = AssignUIHandlePtr( mPlayheadHolder, result );
         results.push_back( result );
      }
   }
#endif
   
   // Disable mouse actions on Timeline while recording.
   if (!mParent->mIsRecording) {
      mParent->UpdateQuickPlayPos( xx );
 
      #if 0
      auto result = std::make_shared<QPHandle>( mParent, xx );
      result = AssignUIHandlePtr( mHolder, result );
      results.push_back( result );
      #endif
   }
 
   // High priority hit is a handle to change the existing play region
   bool hitLeft = false;
   const auto &playRegion = ViewInfo::Get(*pProject).playRegion;
   if ((hitLeft =
        mParent->IsWithinMarker(xx, playRegion.GetLastActiveStart())) ||
       mParent->IsWithinMarker(xx, playRegion.GetLastActiveEnd()))
   {
      auto result =
         std::make_shared<ResizePlayRegionHandle>( mParent, xx, hitLeft );
      result = AssignUIHandlePtr( mResizePlayRegionHolder, result );
      results.push_back(result);
   }
 
   // Middle priority hit is a handle to change the existing play region at
   // both ends, but only when the play region is active
   if (auto time = mParent->Pos2Time(xx);
       playRegion.Active() &&
       time >= playRegion.GetStart() &&
       time <= playRegion.GetEnd())
   {
      auto result =
         std::make_shared<MovePlayRegionHandle>( mParent, xx );
      result = AssignUIHandlePtr( mMovePlayRegionHolder, result );
      results.push_back(result);
   }
 
   // Lowest priority hit is a handle to drag a completely new play region
   {
      auto result = std::make_shared<NewPlayRegionHandle>( mParent, xx );
      result = AssignUIHandlePtr( mNewPlayRegionHolder, result );
      results.push_back(result);
   }
 
   return results;
}
 
class AdornedRulerPanel::ScrubbingHandle final : public CommonRulerHandle
{
public:
   explicit
   ScrubbingHandle( AdornedRulerPanel *pParent, wxCoord xx )
   : CommonRulerHandle( pParent, xx, MenuChoice::Scrub )
   {
   }
 
private:
   Result Click(
      const TrackPanelMouseEvent &event, AudacityProject *pProject) override
   {
      auto result = CommonRulerHandle::Click(event, pProject);
      if (!( result & RefreshCode::Cancelled )) {
         if (mClicked == Button::Left) {
            auto &scrubber = Scrubber::Get( *pProject );
            // only if scrubbing is allowed now
            bool canScrub =
               scrubber.CanScrub() &&
               mParent &&
               mParent->ShowingScrubRuler();
 
            if (!canScrub)
               return RefreshCode::Cancelled;
            if (!scrubber.HasMark()) {
               // Asynchronous scrub poller gets activated here
               scrubber.MarkScrubStart(
                  event.event.m_x, Scrubber::ShouldScrubPinned(), false);
            }
         }
      }
      return result;
   }
 
   Result Drag(
      const TrackPanelMouseEvent &event, AudacityProject *pProject) override
   {
      auto result = CommonRulerHandle::Drag(event, pProject);
      if (!( result & RefreshCode::Cancelled )) {
         // Nothing needed here.  The scrubber works by polling mouse state
         // after the start has been marked.
      }
      return result;
   }
 
   HitTestPreview Preview(
      const TrackPanelMouseState &state, AudacityProject *pProject)
   override;
 
   Result Release(
      const TrackPanelMouseEvent &event, AudacityProject *pProject,
      wxWindow *pParent) override {
      auto result = CommonRulerHandle::Release(event, pProject, pParent);
      if (!( result & RefreshCode::Cancelled )) {
         // Nothing needed here either.  The scrub poller may have decided to
         // seek because a drag happened before button up, or it may decide
         // to start a scrub, as it watches mouse movement after the button up.
      }
      return result;
   }
 
   Result Cancel(AudacityProject *pProject) override
   {
      auto result = CommonRulerHandle::Cancel(pProject);
 
      if (mClicked == Button::Left) {
         auto &scrubber = Scrubber::Get( *pProject );
         scrubber.Cancel();
         
         ProjectAudioManager::Get( *pProject ).Stop();
      }
 
      return result;
   }
};
 
class AdornedRulerPanel::ScrubbingCell final : public CommonCell
{
public:
   explicit
   ScrubbingCell( AdornedRulerPanel *parent )
   : AdornedRulerPanel::CommonCell{ parent, MenuChoice::Scrub }
   {}
   
   std::vector<UIHandlePtr> HitTest(
      const TrackPanelMouseState &state,
      const AudacityProject *pProject) override;
   
   // Return shared_ptr to self, stored in parent
   std::shared_ptr<TrackPanelCell> ContextMenuDelegate() override
      { return mParent->mScrubbingCell; }
   
   bool Hit() const { return !mHolder.expired(); }
   bool Clicked() const {
      if (auto ptr = mHolder.lock())
         return ptr->Clicked();
      return false;
   }
   
private:
   std::weak_ptr<ScrubbingHandle> mHolder;
};
 
std::vector<UIHandlePtr> AdornedRulerPanel::ScrubbingCell::HitTest(
   const TrackPanelMouseState &state, const AudacityProject *)
{
   // Creation of overlays on demand here -- constructor of AdornedRulerPanel
   // is too early to do it
   mParent->CreateOverlays();
   
   std::vector<UIHandlePtr> results;
   
   // Disable mouse actions on Timeline while recording.
   if (!mParent->mIsRecording) {
      auto xx = state.state.m_x;
      mParent->UpdateQuickPlayPos( xx );
      auto result = std::make_shared<ScrubbingHandle>( mParent, xx );
      result = AssignUIHandlePtr( mHolder, result );
      results.push_back( result );
   }
   
   return results;
}
 
namespace{
AttachedWindows::RegisteredFactory sKey{
[]( AudacityProject &project ) -> wxWeakRef< wxWindow > {
   auto &viewInfo = ViewInfo::Get( project );
   auto &window = ProjectWindow::Get( project );
 
   return safenew AdornedRulerPanel( &project, window.GetTrackListWindow(),
      wxID_ANY,
      wxDefaultPosition,
      wxSize( -1, AdornedRulerPanel::GetRulerHeight(false) ),
      &viewInfo );
}
};
}
 
AdornedRulerPanel &AdornedRulerPanel::Get( AudacityProject &project )
{
   return GetAttachedWindows(project).Get< AdornedRulerPanel >( sKey );
}
 
const AdornedRulerPanel &AdornedRulerPanel::Get(
   const AudacityProject &project )
{
   return Get( const_cast< AudacityProject & >( project ) );
}
 
void AdornedRulerPanel::Destroy( AudacityProject &project )
{
   auto *pPanel = GetAttachedWindows(project).Find( sKey );
   if (pPanel) {
      pPanel->wxWindow::Destroy();
      GetAttachedWindows(project).Assign( sKey, nullptr );
   }
}
 
AdornedRulerPanel::AdornedRulerPanel(AudacityProject* project,
   wxWindow *parent,
   wxWindowID id,
   const wxPoint& pos,
   const wxSize& size,
   ViewInfo *viewinfo
)  : CellularPanel(parent, id, pos, size, viewinfo)
   , mProject { project }
   , mUpdater { ProjectTimeRuler::Get(*project).GetUpdater() }
   , mRuler { ProjectTimeRuler::Get(*project).GetRuler() }   
{
   SetLayoutDirection(wxLayout_LeftToRight);
 
   mQPCell = std::make_shared<QPCell>( this );
   mScrubbingCell = std::make_shared<ScrubbingCell>( this );
   
   for (auto &button : mButtons)
      button = nullptr;
 
   SetLabel( XO("Timeline") );
   SetName();
   SetBackgroundStyle(wxBG_STYLE_PAINT);
 
   mLeftOffset = 0;
   mIndTime = -1;
 
   mLeftDownClick = -1;
   mMouseEventState = mesNone;
   mIsDragging = false;
 
   mOuter = GetClientRect();
 
   mTimeDisplayMode = TimeDisplayModePreference.ReadEnum();
 
   mUpdater.SetData(mViewInfo, mLeftOffset);
 
   mRuler.SetLabelEdges( false );
 
   mTracks = &TrackList::Get( *project );
 
   mIsRecording = false;
 
   mTimelineToolTip = !!gPrefs->Read(wxT("/QuickPlay/ToolTips"), 1L);
   mPlayRegionDragsSelection = (gPrefs->Read(wxT("/QuickPlay/DragSelection"), 0L) == 1)? true : false; 
 
#if wxUSE_TOOLTIPS
   wxToolTip::Enable(true);
#endif
 
   mAudioIOSubscription = AudioIO::Get()
      ->Subscribe(*this, &AdornedRulerPanel::OnAudioStartStop);
 
   // Delay until after CommandManager has been populated:
   this->CallAfter( &AdornedRulerPanel::UpdatePrefs );
 
   mThemeChangeSubscription =
      theTheme.Subscribe(*this, &AdornedRulerPanel::OnThemeChange);
 
   // Bind event that updates the play region
   mPlayRegionSubscription = mViewInfo->selectedRegion.Subscribe(
      *this, &AdornedRulerPanel::OnSelectionChange);
 
   mRulerInvalidatedSubscription =
      mRuler.Subscribe([this](auto) { Refresh(); });
   
   // And call it once to initialize it
   DoSelectionChange( mViewInfo->selectedRegion );
}
 
AdornedRulerPanel::~AdornedRulerPanel()
{
}
 
void AdornedRulerPanel::Refresh( bool eraseBackground, const wxRect *rect )
{
   CellularPanel::Refresh( eraseBackground, rect );
   CallAfter([this]{ CellularPanel::HandleCursorForPresentMouseState(); } );
}
 
void AdornedRulerPanel::UpdatePrefs()
{
   if (mNeedButtonUpdate) {
      // Visit this block once only in the lifetime of this panel
      mNeedButtonUpdate = false;
      // Do this first time setting of button status texts
      // when we are sure the CommandManager is initialized.
      ReCreateButtons();
   }
 
   // Update button texts for language change
   UpdateButtonStates();
 
   mTimelineToolTip = !!gPrefs->Read(wxT("/QuickPlay/ToolTips"), 1L);
 
#ifdef EXPERIMENTAL_SCROLLING_LIMITS
#ifdef EXPERIMENTAL_TWO_TONE_TIME_RULER
   {
      auto scrollBeyondZero = ScrollingPreference.Read();
      mRuler.SetTwoTone(scrollBeyondZero);
   }
#endif
#endif
 
   mTimeDisplayMode = TimeDisplayModePreference.ReadEnum();
   Refresh();
   // Update();
}
 
void AdornedRulerPanel::ReCreateButtons()
{
   // TODO: Should we do this to destroy the grabber??
   // Get rid of any children we may have
   // DestroyChildren();
 
   ToolBar::MakeButtonBackgroundsSmall();
   SetBackgroundColour(theTheme.Colour( clrMedium ));
 
   for (auto & button : mButtons) {
      if (button)
         button->Destroy();
      button = nullptr;
   }
 
   size_t iButton = 0;
   // Make the short row of time ruler push buttons.
   // Don't bother with sizers.  Their sizes and positions are fixed.
   // Add a grabber converted to a spacer.
   // This makes it visually clearer that the button is a button.
 
   wxPoint position( 1, 0 );
 
   Grabber * pGrabber = safenew Grabber(this, {});
   pGrabber->SetAsSpacer( true );
   //pGrabber->SetSize( 10, 27 ); // default is 10,27
   pGrabber->SetPosition( position );
 
   position.x = 12;
 
   auto size = theTheme.ImageSize( bmpRecoloredUpSmall );
   size.y = std::min(size.y, GetRulerHeight(false));
 
   auto buttonMaker = [&]
   (wxWindowID id, teBmps bitmap, bool toggle)
   {
      const auto button =
      ToolBar::MakeButton(
         this,
         bmpRecoloredUpSmall, bmpRecoloredDownSmall, 
         bmpRecoloredUpHiliteSmall, bmpRecoloredHiliteSmall, 
         bitmap, bitmap, bitmap,
         id, position, toggle, size
      );
 
      position.x += size.GetWidth();
      mButtons[iButton++] = button;
      return button;
   };
   auto button = buttonMaker(OnTogglePinnedStateID, bmpPlayPointerPinned, true);
   ToolBar::MakeAlternateImages(
      *button, 3,
      bmpRecoloredUpSmall, bmpRecoloredDownSmall,
      bmpRecoloredUpHiliteSmall, bmpRecoloredHiliteSmall,
      //bmpUnpinnedPlayHead, bmpUnpinnedPlayHead, bmpUnpinnedPlayHead,
      bmpRecordPointer, bmpRecordPointer, bmpRecordPointer,
      size);
   ToolBar::MakeAlternateImages(
      *button, 2,
      bmpRecoloredUpSmall, bmpRecoloredDownSmall,
      bmpRecoloredUpHiliteSmall, bmpRecoloredHiliteSmall,
      //bmpUnpinnedPlayHead, bmpUnpinnedPlayHead, bmpUnpinnedPlayHead,
      bmpRecordPointerPinned, bmpRecordPointerPinned, bmpRecordPointerPinned,
      size);
   ToolBar::MakeAlternateImages(
      *button, 1,
      bmpRecoloredUpSmall, bmpRecoloredDownSmall, 
      bmpRecoloredUpHiliteSmall, bmpRecoloredHiliteSmall, 
      //bmpUnpinnedPlayHead, bmpUnpinnedPlayHead, bmpUnpinnedPlayHead,
      bmpPlayPointer, bmpPlayPointer, bmpPlayPointer,
      size);
 
   UpdateButtonStates();
}
 
void AdornedRulerPanel::InvalidateRuler()
{
   mRuler.Invalidate();
}
 
namespace {
   const TranslatableString StartScrubbingMessage(const Scrubber &/*scrubber*/)
   {
#if 0
      if(scrubber.Seeks())
      /* i18n-hint: These commands assist the user in finding a sound by ear. ...
       "Scrubbing" is variable-speed playback, ...
       "Seeking" is normal speed playback but with skips
       */
         return XO("Click or drag to begin Seek");
      else
      /* i18n-hint: These commands assist the user in finding a sound by ear. ...
       "Scrubbing" is variable-speed playback, ...
       "Seeking" is normal speed playback but with skips
       */
         return XO("Click or drag to begin Scrub");
#else
      /* i18n-hint: These commands assist the user in finding a sound by ear. ...
       "Scrubbing" is variable-speed playback, ...
       "Seeking" is normal speed playback but with skips
       */
      return XO("Click & move to Scrub. Click & drag to Seek.");
#endif
   }
 
   const TranslatableString ContinueScrubbingMessage(
      const Scrubber &scrubber, bool clicked)
   {
#if 0
      if(scrubber.Seeks())
      /* i18n-hint: These commands assist the user in finding a sound by ear. ...
       "Scrubbing" is variable-speed playback, ...
       "Seeking" is normal speed playback but with skips
       */
         return XO("Move to Seek");
      else
      /* i18n-hint: These commands assist the user in finding a sound by ear. ...
       "Scrubbing" is variable-speed playback, ...
       "Seeking" is normal speed playback but with skips
       */
         return XO("Move to Scrub");
#else
      if( clicked ) {
         // Since mouse is down, mention dragging first.
         // IsScrubbing is true if Scrubbing OR seeking.
         if( scrubber.IsScrubbing() )
            // User is dragging already, explain.
            return XO("Drag to Seek. Release to stop seeking.");
         else
            // User has clicked but not yet moved or released.
            return XO("Drag to Seek. Release and move to Scrub.");
      }
      // Since mouse is up, mention moving first.
      return XO("Move to Scrub. Drag to Seek.");
#endif
   }
 
   const TranslatableString ScrubbingMessage(const Scrubber &scrubber, bool clicked)
   {
      if (scrubber.HasMark())
         return ContinueScrubbingMessage(scrubber, clicked);
      else
         return StartScrubbingMessage(scrubber);
   }
}
 
void AdornedRulerPanel::OnIdle( wxIdleEvent &evt )
{
   evt.Skip();
   DoIdle();
}
 
void AdornedRulerPanel::DoIdle()
{
   bool changed = UpdateRects();
   changed = SetPanelSize() || changed;
 
   auto &project = *mProject;
   auto &viewInfo = ViewInfo::Get( project );
   const auto &selectedRegion = viewInfo.selectedRegion;
   const auto &playRegion = viewInfo.playRegion;
 
   changed = changed
     || mLastDrawnSelectedRegion != selectedRegion
     || mLastDrawnPlayRegion != std::pair{
         playRegion.GetLastActiveStart(), playRegion.GetLastActiveEnd() }
     || mLastDrawnH != viewInfo.hpos
     || mLastDrawnZoom != viewInfo.GetZoom()
     || mLastPlayRegionActive != viewInfo.playRegion.Active()
   ;
   if (changed)
      // Cause ruler redraw anyway, because we may be zooming or scrolling,
      // showing or hiding the scrub bar, etc.
      Refresh();
}
 
void AdornedRulerPanel::OnAudioStartStop(AudioIOEvent evt)
{
   if (evt.type == AudioIOEvent::MONITOR)
      return;
   if ( evt.type == AudioIOEvent::CAPTURE ) {
      if (evt.on)
      {
         mIsRecording = true;
         this->CellularPanel::CancelDragging( false );
         this->CellularPanel::ClearTargets();
 
         UpdateButtonStates();
      }
      else {
         mIsRecording = false;
         UpdateButtonStates();
      }
   }
 
   if ( !evt.on )
      // So that the play region is updated
      DoSelectionChange( mViewInfo->selectedRegion );
}
 
void AdornedRulerPanel::OnPaint(wxPaintEvent & WXUNUSED(evt))
{
   const auto &viewInfo = ViewInfo::Get( *GetProject() );
   const auto &playRegion = viewInfo.playRegion;
   const auto playRegionBounds = std::pair{
      playRegion.GetLastActiveStart(), playRegion.GetLastActiveEnd() };
   mLastDrawnH = viewInfo.hpos;
   mLastDrawnZoom = viewInfo.GetZoom();
   mLastDrawnPlayRegion = playRegionBounds;
   mLastDrawnSelectedRegion = viewInfo.selectedRegion;
   // To do, note other fisheye state when we have that
 
   wxPaintDC dc(this);
 
   auto &backDC = GetBackingDCForRepaint();
 
   DoDrawBackground(&backDC);
 
   // Find play region rectangle, selected rectangle, and their overlap
   const auto rectP = PlayRegionRectangle(),
      rectS = SelectedRegionRectangle(),
      rectO = rectP.Intersect(rectS);
 
   // What's left and right of the overlap?  Assume same tops and bottoms
   const auto top = rectP.GetTop(),
      bottom = rectP.GetBottom();
   wxRect rectL{
      wxPoint{ 0, top }, wxPoint{ this->GetSize().GetWidth() - 1, bottom } };
   wxRect rectR = {};
   if (!rectO.IsEmpty()) {
      rectR = { wxPoint{ rectO.GetRight() + 1, top }, rectL.GetBottomRight() };
      rectL = { rectL.GetTopLeft(), wxPoint{ rectO.GetLeft() - 1, bottom } };
   }
 
   DoDrawPlayRegion(&backDC, rectP, rectL, rectR);
   DoDrawOverlap(&backDC, rectO);
   DoDrawSelection(&backDC, rectS, rectL, rectR);
 
   DoDrawPlayRegionLimits(&backDC, rectP);
 
   DoDrawMarks(&backDC, true);
 
   DoDrawEdge(&backDC);
 
   DisplayBitmap(dc);
 
   // Stroke extras direct to the client area,
   // maybe outside of the damaged area
   // As with TrackPanel, do not make a NEW wxClientDC or else Mac flashes badly!
   dc.DestroyClippingRegion();
   DrawOverlays(true, &dc);
}
 
void AdornedRulerPanel::OnSize(wxSizeEvent &evt)
{
   mOuter = GetClientRect();
   if (mOuter.GetWidth() == 0 || mOuter.GetHeight() == 0)
   {
      return;
   }
 
   UpdateRects();
 
   OverlayPanel::OnSize(evt);
}
 
void AdornedRulerPanel::OnLeave(wxMouseEvent& evt)
{
   evt.Skip();
   CallAfter([this]{
      DrawBothOverlays();
   });
}
 
void AdornedRulerPanel::OnThemeChange(ThemeChangeMessage message)
{
   if (message.appearance)
      return;
   ReCreateButtons();
}
 
void AdornedRulerPanel::OnSelectionChange(Observer::Message)
{
   auto &selectedRegion = mViewInfo->selectedRegion;
   DoSelectionChange( selectedRegion );
}
 
void AdornedRulerPanel::DoSelectionChange(
   const SelectedRegion &selectedRegion )
{
 
   auto gAudioIO = AudioIOBase::Get();
   if ( !ViewInfo::Get( *mProject ).playRegion.Active() ) {
      // "Inactivated" play region follows the selection.
      SetPlayRegion( selectedRegion.t0(), selectedRegion.t1() );
   }
}
 
bool AdornedRulerPanel::UpdateRects()
{
   auto inner = mOuter;
   wxRect scrubZone;
   inner.x += LeftMargin;
   inner.width -= (LeftMargin + RightMargin);
 
   auto top = &inner;
   auto bottom = &inner;
 
   if (ShowingScrubRuler()) {
      scrubZone = inner;
      auto scrubHeight = std::min(scrubZone.height, (int)(ScrubHeight));
 
      int topHeight;
#ifdef SCRUB_ABOVE
      top = &scrubZone, topHeight = scrubHeight;
#else
      auto qpHeight = scrubZone.height - scrubHeight;
      bottom = &scrubZone, topHeight = qpHeight;
      // Increase scrub zone height so that hit testing finds it and
      // not QP region, when on bottom 'edge'.
      scrubZone.height+=BottomMargin;
#endif
 
      top->height = topHeight;
      bottom->height -= topHeight;
      bottom->y += topHeight;
   }
 
   top->y += TopMargin;
   top->height -= TopMargin;
 
   bottom->height -= BottomMargin;
 
   if (!ShowingScrubRuler())
      scrubZone = inner;
 
   if ( inner == mInner && scrubZone == mScrubZone )
      // no changes
      return false;
 
   mInner = inner;
   mScrubZone = scrubZone;
 
   mRuler.SetBounds(mInner.GetLeft(),
                    mInner.GetTop(),
                    mInner.GetRight(),
                    mInner.GetBottom());
 
   return true;
}
 
double AdornedRulerPanel::Pos2Time(int p, bool ignoreFisheye) const
{
   return mViewInfo->PositionToTime(p, mLeftOffset
      , ignoreFisheye
   );
}
 
int AdornedRulerPanel::Time2Pos(double t, bool ignoreFisheye) const
{
   return mViewInfo->TimeToPosition(t, mLeftOffset
      , ignoreFisheye
   );
}
 
bool AdornedRulerPanel::IsWithinMarker(int mousePosX, double markerTime)
{
   if (markerTime < 0)
      return false;
 
   int pixelPos = Time2Pos(markerTime);
   int boundLeft = pixelPos - SELECT_TOLERANCE_PIXEL;
   int boundRight = pixelPos + SELECT_TOLERANCE_PIXEL;
 
   return mousePosX >= boundLeft && mousePosX < boundRight;
}
 
#ifdef QUICK_PLAY_HANDLE
auto AdornedRulerPanel::QPHandle::Click(
   const TrackPanelMouseEvent &event, AudacityProject *pProject) -> Result
{
   auto result = CommonRulerHandle::Click(event, pProject);
   if (!( result & RefreshCode::Cancelled )) {
      if (mClicked == Button::Left) {
         if (!mParent)
            return RefreshCode::Cancelled;
 
         auto &scrubber = Scrubber::Get( *pProject );
         if(scrubber.HasMark()) {
            // We can't stop scrubbing yet (see comments in Bug 1391),
            // but we can pause it.
            ProjectAudioManager::Get( *pProject ).OnPause();
         }
 
         // Store the initial play region state
         const auto &viewInfo = ViewInfo::Get( *pProject );
         const auto &playRegion = viewInfo.playRegion;
         mParent->mOldPlayRegion = playRegion;
 
         // Save old selection, in case drag of selection is cancelled
         mOldSelection = ViewInfo::Get( *pProject ).selectedRegion;
 
         mParent->HandleQPClick( event.event, mX );
         mParent->HandleQPDrag( event.event, mX );
      }
   }
   
   return result;
}
 
void AdornedRulerPanel::HandleQPClick(wxMouseEvent &evt, wxCoord mousePosX)
{
   // Temporarily inactivate play region
   if (mOldPlayRegion.Active() && evt.LeftDown()) {
      //mPlayRegionLock = true;
      SelectUtilities::InactivatePlayRegion(*mProject);
   }
 
   mLeftDownClickUnsnapped[0] = mQuickPlayPosUnsnapped[0];
   mLeftDownClick = mQuickPlayPos[0];
   bool isWithinStart = IsWithinMarker(mousePosX, mOldPlayRegion.GetStart());
   bool isWithinEnd = IsWithinMarker(mousePosX, mOldPlayRegion.GetEnd());
 
   if (isWithinStart || isWithinEnd) {
      // If Quick-Play is playing from a point, we need to treat it as a click
      // not as dragging.
      if (mOldPlayRegion.Empty())
         mMouseEventState = mesSelectingPlayRegionClick;
      // otherwise check which marker is nearer
      else {
         // Don't compare times, compare positions.
         //if (fabs(mQuickPlayPos[0] - mPlayRegionStart) < fabs(mQuickPlayPos[0] - mPlayRegionEnd))
         auto start = mOldPlayRegion.GetStart();
         auto end = mOldPlayRegion.GetEnd();
         if (abs(Time2Pos(mQuickPlayPos[0]) - Time2Pos(start)) <
             abs(Time2Pos(mQuickPlayPos[0]) - Time2Pos(end)))
            mMouseEventState = mesDraggingPlayRegionStart;
         else
            mMouseEventState = mesDraggingPlayRegionEnd;
      }
   }
   else {
      // Clicked but not yet dragging
      mMouseEventState = mesSelectingPlayRegionClick;
   }
}
 
auto AdornedRulerPanel::QPHandle::Drag(
   const TrackPanelMouseEvent &event, AudacityProject *pProject) -> Result
{
   auto result = CommonRulerHandle::Drag(event, pProject);
   if (!( result & RefreshCode::Cancelled )) {
      if (mClicked == Button::Left) {
         if ( mParent ) {
            mX = event.event.m_x;
            mParent->UpdateQuickPlayPos( mX );
            mParent->HandleQPDrag( event.event, mX );
         }
      }
   }
   return result;
}
 
void AdornedRulerPanel::HandleQPDrag(wxMouseEvent &/*event*/, wxCoord mousePosX)
{
   bool isWithinClick =
      (mLeftDownClickUnsnapped >= 0) &&
      IsWithinMarker(mousePosX, mLeftDownClickUnsnapped);
   bool isWithinStart = IsWithinMarker(mousePosX, mOldPlayRegion.GetStart());
   bool isWithinEnd = IsWithinMarker(mousePosX, mOldPlayRegion.GetEnd());
   bool canDragSel = !mOldPlayRegion.Active() && mPlayRegionDragsSelection;
   auto &viewInfo = ViewInfo::Get( *GetProject() );
   auto &playRegion = viewInfo.playRegion;
 
   switch (mMouseEventState)
   {
      case mesNone:
         // If close to either end of play region, snap to closest
         if (isWithinStart || isWithinEnd) {
            if (fabs(mQuickPlayPos[0] - mOldPlayRegion.GetStart()) < fabs(mQuickPlayPos[0] - mOldPlayRegion.GetEnd()))
               mQuickPlayPos[0] = mOldPlayRegion.GetStart();
            else
               mQuickPlayPos[0] = mOldPlayRegion.GetEnd();
         }
         break;
      case mesDraggingPlayRegionStart:
         // Don't start dragging until beyond tolerance initial playback start
         if (!mIsDragging && isWithinStart)
            mQuickPlayPos[0] = mOldPlayRegion.GetStart();
         else
            mIsDragging = true;
         // avoid accidental tiny selection
         if (isWithinEnd)
            mQuickPlayPos[0] = mOldPlayRegion.GetEnd();
         playRegion.SetStart( mQuickPlayPos[0] );
         if (canDragSel) {
            DragSelection(*GetProject());
         }
         break;
      case mesDraggingPlayRegionEnd:
         if (!mIsDragging && isWithinEnd) {
            mQuickPlayPos[0] = mOldPlayRegion.GetEnd();
         }
         else
            mIsDragging = true;
         if (isWithinStart) {
            mQuickPlayPos[0] = mOldPlayRegion.GetStart();
         }
         playRegion.SetEnd( mQuickPlayPos[0] );
         if (canDragSel) {
            DragSelection(*GetProject());
         }
         break;
      case mesSelectingPlayRegionClick:
 
         // Don't start dragging until mouse is beyond tolerance of initial click.
         if (isWithinClick || mLeftDownClick == -1) {
            mQuickPlayPos[0] = mLeftDownClick;
            playRegion.SetTimes(mLeftDownClick, mLeftDownClick);
         }
         else {
            mMouseEventState = mesSelectingPlayRegionRange;
         }
         break;
      case mesSelectingPlayRegionRange:
         if (isWithinClick) {
            mQuickPlayPos[0] = mLeftDownClick;
         }
 
         if (mQuickPlayPos[0] < mLeftDownClick)
            playRegion.SetTimes( mQuickPlayPos[0], mLeftDownClick );
         else
            playRegion.SetTimes( mLeftDownClick, mQuickPlayPos[0] );
         if (canDragSel) {
            DragSelection(*GetProject());
         }
         break;
   }
   Refresh();
   Update();
}
#endif
 
auto AdornedRulerPanel::ScrubbingHandle::Preview(
   const TrackPanelMouseState &, AudacityProject *pProject)
      -> HitTestPreview
{
   auto &scrubber = Scrubber::Get( *pProject );
   auto message = ScrubbingMessage(scrubber, mClicked == Button::Left);
 
   mParent->SetNumGuides(1);
   return {
      message,
      {},
      // Tooltip is same as status message, or blank
      ((mParent && mParent->mTimelineToolTip) ? message : TranslatableString{}),
   };
}
 
#ifdef QUICK_PLAY_HANDLE
auto AdornedRulerPanel::QPHandle::Preview(
   const TrackPanelMouseState &state, AudacityProject *pProject)
      -> HitTestPreview
{
   mParent->SetNumGuides(1);
   TranslatableString tooltip;
   #if 0
   if (mParent && mParent->mTimelineToolTip) {
      if (!mParent->mQuickPlayEnabled)
         tooltip = XO("Quick-Play disabled");
      else
         tooltip = XO("Quick-Play enabled");
   }
   #endif
 
   TranslatableString message;
   auto &scrubber = Scrubber::Get( *pProject );
   const bool scrubbing = scrubber.HasMark();
   if (scrubbing)
      // Don't distinguish zones
      message = ScrubbingMessage(scrubber, false);
   else
      // message = Insert timeline status bar message here
      ;
 
   static wxCursor cursorHand{ wxCURSOR_HAND };
   static wxCursor cursorSizeWE{ wxCURSOR_SIZEWE };
   
   bool showArrows = false;
   if (mParent)
      showArrows =
         (mClicked == Button::Left)
         || mParent->IsWithinMarker(
               state.state.m_x, mParent->mOldPlayRegion.GetStart())
         || mParent->IsWithinMarker(
               state.state.m_x, mParent->mOldPlayRegion.GetEnd());
   
   return {
      message,
      showArrows ? &cursorSizeWE : &cursorHand,
      tooltip,
   };
}
 
auto AdornedRulerPanel::QPHandle::Release(
   const TrackPanelMouseEvent &event, AudacityProject *pProject,
   wxWindow *pParent)
      -> Result
{
   // Keep a shared pointer to self.  Otherwise *this might get deleted
   // in HandleQPRelease on Windows!  Because there is an event-loop yield
   // stopping playback, which caused OnCaptureLost to be called, which caused
   // clearing of CellularPanel targets!
   auto saveMe = mParent->mQPCell->mHolder.lock();
 
   auto result = CommonRulerHandle::Release(event, pProject, pParent);
   if (!( result & RefreshCode::Cancelled )) {
      if (mClicked == Button::Left) {
         if ( mParent ) {
            mParent->HandleQPRelease( event.event );
            // Update the hot zones for cursor changes
            const auto &viewInfo = ViewInfo::Get( *pProject );
            const auto &playRegion = viewInfo.playRegion;
            mParent->mOldPlayRegion = playRegion;
         }
      }
   }
   return result;
}
 
void AdornedRulerPanel::HandleQPRelease(wxMouseEvent &evt)
{
   auto &viewInfo = ViewInfo::Get(*GetProject());
   auto &playRegion = viewInfo.playRegion;
   playRegion.Order();
 
   const double t0 = mTracks->GetStartTime();
   const double t1 = mTracks->GetEndTime();
   const auto &selectedRegion = viewInfo.selectedRegion;
   const double sel0 = selectedRegion.t0();
   const double sel1 = selectedRegion.t1();
 
   // We want some audio in the selection, but we allow a dragged
   // region to include selected white-space and space before audio start.
   if (evt.ShiftDown() && playRegion.Empty()) {
      // Looping the selection or project.
      // Disable if track selection is in white-space beyond end of tracks and
      // play position is outside of track contents.
      if (((sel1 < t0) || (sel0 > t1)) &&
          ((playRegion.GetStart() < t0) || (playRegion.GetStart() > t1))) {
         ClearPlayRegion();
      }
   }
   // Disable if beyond end.
   else if (playRegion.GetStart() >= t1) {
      ClearPlayRegion();
   }
   // Disable if empty selection before start.
   // (allow Quick-Play region to include 'pre-roll' white space)
   else if (
      playRegion.GetEnd() - playRegion.GetStart() > 0.0 &&
      playRegion.GetEnd() < t0
   ) {
      ClearPlayRegion();
   }
 
   mMouseEventState = mesNone;
   mIsDragging = false;
   mLeftDownClick = -1;
 
   auto cleanup = finally( [&] {
      if (mOldPlayRegion.Active()) {
         // Restore Locked Play region
         SetPlayRegion(mOldPlayRegion.GetStart(), mOldPlayRegion.GetEnd());
         SelectUtilities::ActivatePlayRegion(*mProject);
         // and release local lock
         mOldPlayRegion.SetActive( false );
      }
   } );
 
   StartQPPlay(!evt.ShiftDown(), evt.ControlDown());
}
 
auto AdornedRulerPanel::QPHandle::Cancel(AudacityProject *pProject) -> Result
{
   auto result = CommonRulerHandle::Cancel(pProject);
 
   if (mClicked == Button::Left) {
      if( mParent ) {
         ViewInfo::Get( *pProject ).selectedRegion = mOldSelection;
         mParent->mMouseEventState = mesNone;
         mParent->SetPlayRegion(
            mParent->mOldPlayRegion.GetStart(), mParent->mOldPlayRegion.GetEnd());
         if (mParent->mOldPlayRegion.Active()) {
            // Restore Locked Play region
            SelectUtilities::ActivatePlayRegion(*pProject);
            // and release local lock
            mParent->mOldPlayRegion.SetActive( false );
         }
      }
   }
 
   return result;
}
#endif
 
void AdornedRulerPanel::StartQPPlay(
   bool newDefault, bool cutPreview, const double *pStartTime)
{
   const double t0 = mTracks->GetStartTime();
   const double t1 = mTracks->GetEndTime();
   auto &viewInfo = ViewInfo::Get( *mProject );
   const auto &playRegion = viewInfo.playRegion;
   const auto &selectedRegion = viewInfo.selectedRegion;
   const double sel0 = selectedRegion.t0();
   const double sel1 = selectedRegion.t1();
 
   // Start / Restart playback on left click.
   bool startPlaying = true; // = (playRegion.GetStart() >= 0);
 
   if (startPlaying) {
      bool loopEnabled = true;
      auto oldStart = std::max(0.0, playRegion.GetStart());
      double start = oldStart, end = 0;
 
      if (playRegion.Empty()) {
         // Play either a selection or the project.
         if (oldStart > sel0 && oldStart < sel1) {
            // we are in a selection, so use the selection
            start = sel0;
            end = sel1;
         } // not in a selection, so use the project
         else {
            start = t0;
            end = t1;
         }
      }
      else
         end = std::max(start, playRegion.GetEnd());
 
      // Looping a tiny selection may freeze, so just play it once.
      loopEnabled = ((end - start) > 0.001)? true : false;
 
      newDefault = (loopEnabled && newDefault);
      if (newDefault)
         cutPreview = false;
      auto options = ProjectAudioIO::GetDefaultOptions(*mProject, newDefault);
 
      if (!cutPreview) {
         if (pStartTime)
            options.pStartTime.emplace(*pStartTime);
      }
      else
         options.envelope = nullptr;
 
      auto mode =
         cutPreview ? PlayMode::cutPreviewPlay
         : newDefault ? PlayMode::loopedPlay
         : PlayMode::normalPlay;
 
      // Stop only after deciding where to start again, because an event
      // callback may change the play region back to the selection
      auto &projectAudioManager = ProjectAudioManager::Get( *mProject );
      projectAudioManager.Stop();
 
      // Don't change play region, assume caller set it as needed
      // playRegion.SetTimes( start, end );
      // Refresh();
 
      projectAudioManager.PlayPlayRegion((SelectedRegion(start, end)),
                          options, mode,
                          false);
 
   }
}
 
#if 0
// This version toggles ruler state indirectly via the scrubber
// to ensure that all the places where the state is shown update.
// For example buttons and menus must update.
void AdornedRulerPanel::OnToggleScrubRulerFromMenu(wxCommandEvent&)
{
   auto &scrubber = Scrubber::Get( *mProject );
   scrubber.OnToggleScrubRuler(*mProject);
}
#endif
 
 
bool AdornedRulerPanel::SetPanelSize()
{
   const auto oldSize = GetSize();
   wxSize size { oldSize.GetWidth(), GetRulerHeight(ShowingScrubRuler()) };
   if ( size != oldSize ) {
      SetSize(size);
      SetMinSize(size);
      PostSizeEventToParent();
      return true;
   }
   else
      return false;
}
 
void AdornedRulerPanel::DrawBothOverlays()
{
   auto pCellularPanel =
      dynamic_cast<CellularPanel*>( &GetProjectPanel( *GetProject() ) );
   if ( !pCellularPanel ) {
      wxASSERT( false );
   }
   else
      pCellularPanel->DrawOverlays( false );
   DrawOverlays( false );
}
 
void AdornedRulerPanel::UpdateButtonStates()
{
   auto common = [this](
      AButton &button, const CommandID &commandName, const TranslatableString &label) {
      ComponentInterfaceSymbol command{ commandName, label };
      ToolBar::SetButtonToolTip( *mProject, button, &command, 1u );
      button.SetLabel( Verbatim( button.GetToolTipText() ) );
 
      button.UpdateStatus();
   };
 
   {
      // The button always reflects the pinned head preference, even though
      // there is also a Playback preference that may overrule it for scrubbing
      bool state = TracksPrefs::GetPinnedHeadPreference();
      auto pinButton = static_cast<AButton*>(FindWindow(OnTogglePinnedStateID));
      if( !state )
         pinButton->PopUp();
      else
         pinButton->PushDown();
      auto gAudioIO = AudioIO::Get();
      pinButton->SetAlternateIdx(
         (gAudioIO->IsCapturing() ? 2 : 0) + (state ? 0 : 1));
      // Bug 1584: Tooltip now shows what clicking will do.
      // Bug 2357: Action of button (and hence tooltip wording) updated.
      const auto label = XO("Timeline Options");
      common(*pinButton, wxT("PinnedHead"), label);
   }
}
 
void AdornedRulerPanel::OnPinnedButton(wxCommandEvent & /*event*/)
{
   ShowContextMenu(MenuChoice::QuickPlay, NULL);
}
 
void AdornedRulerPanel::OnTogglePinnedState(wxCommandEvent & /*event*/)
{
   TogglePinnedHead();
   UpdateButtonStates();
}
 
void AdornedRulerPanel::UpdateQuickPlayPos(wxCoord &mousePosX)
{
   // Invoked for mouse-over preview events, or dragging, or scrub position
   // polling updates.  Remember x coordinates, converted to times, for
   // drawing of guides.
 
   // Keep Quick-Play within usable track area.  (Dependent on zoom)
   const auto &viewInfo = ViewInfo::Get( *mProject );
   auto width = viewInfo.GetTracksUsableWidth();
   mousePosX = std::max(mousePosX, viewInfo.GetLeftOffset());
   mousePosX = std::min(mousePosX, viewInfo.GetLeftOffset() + width - 1);
   const auto time = Pos2Time(mousePosX);
 
   for (size_t ii = 0; ii < mNumGuides; ++ii) {
      mQuickPlayPosUnsnapped[ii] = mQuickPlayPos[ii] =
         time + mQuickPlayOffset[ii];
      HandleSnapping(ii);
   }
}
 
// Pop-up menus
 
void AdornedRulerPanel::ShowMenu(const wxPoint & pos)
{
   const auto &viewInfo = ViewInfo::Get( *GetProject() );
   const auto &playRegion = viewInfo.playRegion;
   wxMenu rulerMenu;
 
   {
      auto item = rulerMenu.AppendRadioItem(OnMinutesAndSecondsID,
         _("Minutes and Seconds"));
      item->Check(mTimeDisplayMode == TimeDisplayMode::MinutesAndSeconds);
   }
 
   {
      auto item = rulerMenu.AppendRadioItem(OnBeatsAndMeasuresID,
         _("Beats and Measures"));
      item->Check(mTimeDisplayMode == TimeDisplayMode::BeatsAndMeasures);
   }
 
   rulerMenu.AppendSeparator();
 
   auto pDrag = rulerMenu.AppendCheckItem(OnSyncQuickPlaySelID, _("Setting a loop region also makes an audio selection"));
   pDrag->Check(mPlayRegionDragsSelection && playRegion.Active());
   pDrag->Enable(playRegion.Active());
 
   rulerMenu.AppendCheckItem(OnAutoScrollID, _("Update display while playing"))->
      Check(mViewInfo->bUpdateTrackIndicator);
 
   {
      auto item = rulerMenu.AppendCheckItem(OnTogglePlayRegionID,
         LoopToggleText.Stripped().Translation());
      item->Check(playRegion.Active());
   }
 
   {
      auto item = rulerMenu.Append(OnClearPlayRegionID,
         /* i18n-hint Clear is a verb */
         _("Clear Loop"));
   }
 
   {
      auto item = rulerMenu.Append(OnSetPlayRegionToSelectionID,
         _("Set Loop To Selection"));
   }
 
   rulerMenu.AppendSeparator();
   rulerMenu.AppendCheckItem(OnTogglePinnedStateID, _("Pinned Play Head"))->
      Check(TracksPrefs::GetPinnedHeadPreference());
 
   BasicMenu::Handle{ &rulerMenu }.Popup(
      wxWidgetsWindowPlacement{ this },
      { pos.x, pos.y }
   );
}
 
void AdornedRulerPanel::ShowScrubMenu(const wxPoint & pos)
{
   auto &scrubber = Scrubber::Get( *mProject );
   PushEventHandler(&scrubber);
   auto cleanup = finally([this]{ PopEventHandler(); });
 
   wxMenu rulerMenu;
   scrubber.PopulatePopupMenu(rulerMenu);
   BasicMenu::Handle{ &rulerMenu }.Popup(
      wxWidgetsWindowPlacement{ this },
      { pos.x, pos.y }
   );
}
 
void AdornedRulerPanel::DragSelection(AudacityProject &project)
{
   auto &viewInfo = ViewInfo::Get( project );
   const auto &playRegion = viewInfo.playRegion;
   auto &selectedRegion = viewInfo.selectedRegion;
   selectedRegion.setT0(playRegion.GetStart(), false);
   selectedRegion.setT1(playRegion.GetEnd(), true);
}
 
void AdornedRulerPanel::HandleSnapping(size_t index)
{
   // Play region dragging can snap to selection boundaries
   const auto &selectedRegion = ViewInfo::Get(*GetProject()).selectedRegion;
   SnapPointArray candidates;
   if (!mPlayRegionDragsSelection)
      candidates = {
         SnapPoint{ selectedRegion.t0() },
         SnapPoint{ selectedRegion.t1() },
      };
   SnapManager snapManager{ *mProject, *mTracks, *mViewInfo, move(candidates) };
   auto results = snapManager.Snap(nullptr, mQuickPlayPos[index], false);
   mQuickPlayPos[index] = results.outTime;
   mIsSnapped[index] = results.Snapped();
}
 
void AdornedRulerPanel::OnTimelineFormatChange(wxCommandEvent& event)
{
   int id = event.GetId();
   TimeDisplayMode changeFlag = mTimeDisplayMode;
   wxASSERT(id == OnMinutesAndSecondsID || id == OnBeatsAndMeasuresID);
   mTimeDisplayMode = id == OnBeatsAndMeasuresID ? TimeDisplayMode::BeatsAndMeasures :
                                             TimeDisplayMode::MinutesAndSeconds;
   
   TimeDisplayModePreference.WriteEnum(mTimeDisplayMode);
 
   if (changeFlag != mTimeDisplayMode)
      Refresh();
}
 
void AdornedRulerPanel::OnSyncSelToQuickPlay(wxCommandEvent&)
{
   mPlayRegionDragsSelection = (mPlayRegionDragsSelection) ? false : true;
   gPrefs->Write(wxT("/QuickPlay/DragSelection"), mPlayRegionDragsSelection);
   gPrefs->Flush();
}
 
#if 0
void AdornedRulerPanel::OnTimelineToolTips(wxCommandEvent&)
{
   mTimelineToolTip = (mTimelineToolTip)? false : true;
   gPrefs->Write(wxT("/QuickPlay/ToolTips"), mTimelineToolTip);
   gPrefs->Flush();
}
#endif
 
 
void AdornedRulerPanel::OnAutoScroll(wxCommandEvent&)
{
   if (mViewInfo->bUpdateTrackIndicator)
      gPrefs->Write(wxT("/GUI/AutoScroll"), false);
   else
      gPrefs->Write(wxT("/GUI/AutoScroll"), true);
 
   gPrefs->Flush();
 
   PrefsListener::Broadcast(ViewInfo::UpdateScrollPrefsID());
}
 
 
void AdornedRulerPanel::OnTogglePlayRegion(wxCommandEvent&)
{
   SelectUtilities::TogglePlayRegion(*mProject);
}
 
void AdornedRulerPanel::OnClearPlayRegion(wxCommandEvent&)
{
   SelectUtilities::ClearPlayRegion(*mProject);
}
 
void AdornedRulerPanel::OnSetPlayRegionToSelection(wxCommandEvent&)
{
   SelectUtilities::SetPlayRegionToSelection(*mProject);
}
 
 
void AdornedRulerPanel::ShowContextMenu(
   MenuChoice choice, const wxPoint *pPosition)
{
   wxPoint position;
   if(pPosition)
      position = *pPosition;
   else
   {
      auto rect = GetRect();
      //Old code put menu too low down.  y position applied twice.
      //position = { rect.GetLeft() + 1, rect.GetBottom() + 1 };
 
      // The cell does not pass in the mouse or button position.
      // We happen to know this is the pin/unpin button
      // so these magic values 'fix a bug' - but really the cell should
      // pass more information to work with in.
      position = { rect.GetLeft() + 38, rect.GetHeight()/2 + 1 };
   }
 
   switch (choice) {
      case MenuChoice::QuickPlay:
         ShowMenu(position); 
         UpdateButtonStates();
         break;
      case MenuChoice::Scrub:
         ShowScrubMenu(position); break;
      default:
         return;
   }
}
 
using ColorId = decltype(clrTrackInfo);
 
inline ColorId TimelineBackgroundColor()
{
   return clrTrackInfo;
}
 
inline ColorId TimelineTextColor()
{
   return clrTrackPanelText;
}
 
inline ColorId TimelineLimitsColor()
{
   return TimelineTextColor();
}
 
inline ColorId TimelineLoopRegionColor(bool isActive)
{
   return isActive ? clrRulerBackground : clrClipAffordanceInactiveBrush;
}
 
static inline wxColour AlphaBlend(ColorId fg, ColorId bg, double alpha)
{
   const auto &fgc = theTheme.Colour(fg);
   const auto &bgc = theTheme.Colour(bg);
   return wxColour{
      wxColour::AlphaBlend(fgc.Red(), bgc.Red(), alpha),
      wxColour::AlphaBlend(fgc.Green(), bgc.Green(), alpha),
      wxColour::AlphaBlend(fgc.Blue(), bgc.Blue(), alpha)
   };
}
 
void AdornedRulerPanel::DoDrawBackground(wxDC * dc)
{
   // Draw AdornedRulerPanel border
   AColor::UseThemeColour( dc, TimelineBackgroundColor() );
   dc->DrawRectangle( mInner );
 
   if (ShowingScrubRuler()) {
      // Let's distinguish the scrubbing area by using a themable
      // colour and a line to set it off.  
      AColor::UseThemeColour(dc, clrScrubRuler, TimelineTextColor() );
      wxRect ScrubRect = mScrubZone;
      ScrubRect.Inflate( 1,0 );
      dc->DrawRectangle(ScrubRect);
   }
}
 
void AdornedRulerPanel::DoDrawEdge(wxDC *dc)
{
   wxRect r = mOuter;
   r.width -= RightMargin;
   r.height -= BottomMargin;
   AColor::BevelTrackInfo( *dc, true, r );
 
   // Black stroke at bottom
   dc->SetPen( *wxBLACK_PEN );
   AColor::Line( *dc, mOuter.x,
                mOuter.y + mOuter.height - 1,
                mOuter.x + mOuter.width - 1  ,
                mOuter.y + mOuter.height - 1 );
}
 
void AdornedRulerPanel::DoDrawMarks(wxDC * dc, bool /*text */ )
{
   const double min = Pos2Time(0);
   const double hiddenMin = Pos2Time(0, true);
   const double max = Pos2Time(mInner.width);
   const double hiddenMax = Pos2Time(mInner.width, true);
 
   mRuler.SetTickColour( theTheme.Colour( TimelineTextColor() ) );
   mRuler.SetRange( min, max, hiddenMin, hiddenMax );
   if (mTimeDisplayMode == TimeDisplayMode::BeatsAndMeasures)
   {
      mRuler.SetTickLengths({ 5, 3, 1 });
   }
   else if (mTimeDisplayMode == TimeDisplayMode::MinutesAndSeconds)
   {
      mRuler.SetTickLengths({ 4, 2, 2 });
   }
   mRuler.Draw( *dc );
}
 
void AdornedRulerPanel::DrawSelection()
{
   Refresh();
}
 
wxRect AdornedRulerPanel::PlayRegionRectangle() const
{
   const auto &viewInfo = ViewInfo::Get(*mProject);
   const auto &playRegion = viewInfo.playRegion;
   const auto t0 = playRegion.GetLastActiveStart(),
      t1 = playRegion.GetLastActiveEnd();
   return RegionRectangle(t0, t1);
}
 
wxRect AdornedRulerPanel::SelectedRegionRectangle() const
{
   const auto &viewInfo = ViewInfo::Get(*mProject);
   const auto &selectedRegion = viewInfo.selectedRegion;
   const auto t0 = selectedRegion.t0(), t1 = selectedRegion.t1();
   return RegionRectangle(t0, t1);
}
 
wxRect AdornedRulerPanel::RegionRectangle(double t0, double t1) const
{
   int p0 = -1, p1 = -1;
   if (t0 == t1)
      // Make the rectangle off-screen horizontally, but set the height
      ;
   else {
      p0 = max(1, Time2Pos(t0));
      p1 = min(mInner.width, Time2Pos(t1));
   }
 
   const int left = p0, top = mInner.y, right = p1, bottom = mInner.GetBottom();
   return { wxPoint{left, top}, wxPoint{right, bottom} };
}
 
void AdornedRulerPanel::DoDrawPlayRegion(
   wxDC * dc, const wxRect &rectP, const wxRect &rectL, const wxRect &rectR)
{
   const auto &viewInfo = ViewInfo::Get(*mProject);
   const auto& playRegion = viewInfo.playRegion;
 
   const bool isActive = (mLastPlayRegionActive = playRegion.Active());
 
   if (playRegion.IsLastActiveRegionClear())
      return;
 
   // Paint the selected region bolder if independently varying, else dim
   const auto color = TimelineLoopRegionColor(isActive);
   dc->SetBrush( wxBrush( theTheme.Colour( color )) );
   dc->SetPen(   wxPen(   theTheme.Colour( color )) );
 
   dc->DrawRectangle( rectP.Intersect(rectL) );
   dc->DrawRectangle( rectP.Intersect(rectR) );
}
 
void AdornedRulerPanel::DoDrawPlayRegionLimits(wxDC * dc, const wxRect &rect)
{
   // Color the edges of the play region like the ticks and numbers
   ADCChanger cleanup( dc );
   const auto edgeColour = theTheme.Colour(TimelineLimitsColor());
   dc->SetPen( { edgeColour } );
   dc->SetBrush( { edgeColour } );
 
   constexpr int side = 7;
   constexpr int sideLessOne = side - 1;
 
   // Paint two shapes, each a line plus triangle at bottom
   const auto left = rect.GetLeft(),
      right = rect.GetRight(),
      bottom = rect.GetBottom(),
      top = rect.GetTop();
   {
      wxPoint points[]{
         {left, bottom - sideLessOne},
         {left - sideLessOne, bottom},
         {left, bottom},
         {left, top},
      };
      dc->DrawPolygon( 4, points );
   }
 
   {
      wxPoint points[]{
         {right, top},
         {right, bottom},
         {right + sideLessOne, bottom},
         {right, bottom - sideLessOne},
      };
      dc->DrawPolygon( 4, points );
   }
}
 
constexpr double SelectionOpacity = 0.2;
 
void AdornedRulerPanel::DoDrawOverlap(wxDC * dc, const wxRect &rect)
{
   dc->SetBrush( wxBrush{ AlphaBlend(
      TimelineLimitsColor(), TimelineLoopRegionColor(mLastPlayRegionActive),
      SelectionOpacity) } );
   dc->SetPen( *wxTRANSPARENT_PEN );
   dc->DrawRectangle( rect );
}
 
void AdornedRulerPanel::DoDrawSelection(
   wxDC * dc, const wxRect &rectS, const wxRect &rectL, const wxRect &rectR)
{
   dc->SetBrush( wxBrush{ AlphaBlend(
      TimelineLimitsColor(), TimelineBackgroundColor(), SelectionOpacity) } );
   dc->SetPen( *wxTRANSPARENT_PEN );
   dc->DrawRectangle( rectS.Intersect(rectL) );
   dc->DrawRectangle( rectS.Intersect(rectR) );
}
 
int AdornedRulerPanel::GetRulerHeight(bool showScrubBar)
{
   return ProperRulerHeight + (showScrubBar ? ScrubHeight : 0);
}
 
void AdornedRulerPanel::SetLeftOffset(int offset)
{
   if (mLeftOffset != offset) {
      mLeftOffset = offset;
      mUpdater.SetData(mViewInfo, offset);
      mRuler.Invalidate();
   }
}
 
// Draws the scrubbing/seeking indicator.
void AdornedRulerPanel::DoDrawScrubIndicator(
   wxDC * dc, wxCoord xx, int width, bool scrub, bool seek)
{
   ADCChanger changer(dc); // Undo pen and brush changes at function exit
 
   wxPoint tri[ 3 ];
   if (seek) {
      auto height = IndicatorHeightForWidth(width);
      // Make four triangles
      const int TriangleWidth = width * 3 / 8;
 
      // Double-double headed, left-right
      auto yy = ShowingScrubRuler()
      ? mScrubZone.y
      : (mInner.GetBottom() + 1) - 1 /* bevel */ - height;
      tri[ 0 ].x = xx - IndicatorOffset;
      tri[ 0 ].y = yy;
      tri[ 1 ].x = xx - IndicatorOffset;
      tri[ 1 ].y = yy + height;
      tri[ 2 ].x = xx - TriangleWidth;
      tri[ 2 ].y = yy + height / 2;
      dc->DrawPolygon( 3, tri );
 
      tri[ 0 ].x -= TriangleWidth;
      tri[ 1 ].x -= TriangleWidth;
      tri[ 2 ].x -= TriangleWidth;
      dc->DrawPolygon( 3, tri );
 
      tri[ 0 ].x = tri[ 1 ].x = xx + IndicatorOffset;
      tri[ 2 ].x = xx + TriangleWidth;
      dc->DrawPolygon( 3, tri );
 
 
      tri[ 0 ].x += TriangleWidth;
      tri[ 1 ].x += TriangleWidth;
      tri[ 2 ].x += TriangleWidth;
      dc->DrawPolygon( 3, tri );
   }
   else if (scrub) {
      auto height = IndicatorHeightForWidth(width);
      const int IndicatorHalfWidth = width / 2;
 
      // Double headed, left-right
      auto yy = ShowingScrubRuler()
         ? mScrubZone.y
         : (mInner.GetBottom() + 1) - 1 /* bevel */ - height;
      tri[ 0 ].x = xx - IndicatorOffset;
      tri[ 0 ].y = yy;
      tri[ 1 ].x = xx - IndicatorOffset;
      tri[ 1 ].y = yy + height;
      tri[ 2 ].x = xx - IndicatorHalfWidth;
      tri[ 2 ].y = yy + height / 2;
      dc->DrawPolygon( 3, tri );
      tri[ 0 ].x = tri[ 1 ].x = xx + IndicatorOffset;
      tri[ 2 ].x = xx + IndicatorHalfWidth;
      dc->DrawPolygon( 3, tri );
   }
}
 
void AdornedRulerPanel::SetPlayRegion(
   double playRegionStart, double playRegionEnd)
{
   // This is called by AudacityProject to make the play region follow
   // the current selection. But while the user is selecting a play region
   // with the mouse directly in the ruler, changes from outside are blocked.
   if (mMouseEventState != mesNone)
      return;
 
   auto &viewInfo = ViewInfo::Get( *GetProject() );
   auto &playRegion = viewInfo.playRegion;
   playRegion.SetTimes( playRegionStart, playRegionEnd );
 
   Refresh();
}
 
void AdornedRulerPanel::ClearPlayRegion()
{
   ProjectAudioManager::Get( *mProject ).Stop();
 
   auto &viewInfo = ViewInfo::Get( *GetProject() );
   auto &playRegion = viewInfo.playRegion;
   playRegion.Clear();
 
   Refresh();
}
 
void AdornedRulerPanel::GetMaxSize(wxCoord *width, wxCoord *height)
{
   mRuler.GetMaxSize(width, height);
}
 
bool AdornedRulerPanel::s_AcceptsFocus{ false };
 
auto AdornedRulerPanel::TemporarilyAllowFocus() -> TempAllowFocus {
   s_AcceptsFocus = true;
   return TempAllowFocus{ &s_AcceptsFocus };
}
 
void AdornedRulerPanel::SetNumGuides(size_t nn)
{
   nn = std::min(nn, MAX_GUIDES);
   // If increasing the number of guides, reinitialize newer ones
   for (size_t ii = mNumGuides; ii < nn; ++ii) {
      mQuickPlayOffset[ii] = 0;
      mQuickPlayPosUnsnapped[ii] = 0;
      mQuickPlayPos[ii] = 0;
      mIsSnapped[ii] = false;
   }
   mNumGuides = nn;
}
 
void AdornedRulerPanel::SetFocusFromKbd()
{
   auto temp = TemporarilyAllowFocus();
   SetFocus();
}
 
// Second-level subdivision includes quick-play region and maybe the scrub bar
// and also shaves little margins above and below
struct AdornedRulerPanel::Subgroup final : TrackPanelGroup {
   explicit Subgroup( const AdornedRulerPanel &ruler ) : mRuler{ ruler } {}
   Subdivision Children( const wxRect & ) override
   {
      return { Axis::Y, ( mRuler.ShowingScrubRuler() )
         ? Refinement{
            { mRuler.mInner.GetTop(), mRuler.mQPCell },
            { mRuler.mScrubZone.GetTop(), mRuler.mScrubbingCell },
            { mRuler.mScrubZone.GetBottom() + 1, nullptr }
         }
         : Refinement{
            { mRuler.mInner.GetTop(), mRuler.mQPCell },
            { mRuler.mInner.GetBottom() + 1, nullptr }
         }
      };
   }
   const AdornedRulerPanel &mRuler;
};
 
// Top-level subdivision shaves little margins off left and right
struct AdornedRulerPanel::MainGroup final : TrackPanelGroup {
   explicit MainGroup( const AdornedRulerPanel &ruler ) : mRuler{ ruler } {}
   Subdivision Children( const wxRect & ) override
   { return { Axis::X, Refinement{
      // Subgroup is a throwaway object
      { mRuler.mInner.GetLeft(), std::make_shared< Subgroup >( mRuler ) },
      { mRuler.mInner.GetRight() + 1, nullptr }
   } }; }
   const AdornedRulerPanel &mRuler;
};
 
bool AdornedRulerPanel::ShowingScrubRuler() const
{
   auto &scrubber = Scrubber::Get( *GetProject() );
   return scrubber.ShowsBar();
}
 
// CellularPanel implementation
std::shared_ptr<TrackPanelNode> AdornedRulerPanel::Root()
{
   // Root is a throwaway object
   return std::make_shared< MainGroup >( *this );
}
 
AudacityProject * AdornedRulerPanel::GetProject() const
{
   return mProject;
}
 
 
TrackPanelCell *AdornedRulerPanel::GetFocusedCell()
{
   // No switching of focus yet to the other, scrub zone
   return mQPCell.get();
}
 
 
void AdornedRulerPanel::SetFocusedCell()
{
}
 
 
void AdornedRulerPanel::ProcessUIHandleResult(
   TrackPanelCell *, TrackPanelCell *, unsigned refreshResult)
{
   if (refreshResult & RefreshCode::RefreshAll)
      Refresh(); // Overlays will be repainted too
   else if (refreshResult & RefreshCode::DrawOverlays)
      DrawBothOverlays(); // cheaper redrawing of guidelines only
}
 
void AdornedRulerPanel::UpdateStatusMessage( const TranslatableString &message )
{
   ProjectStatus::Get( *GetProject() ).Set(message);
}
 
void AdornedRulerPanel::CreateOverlays()
{
   if (!mOverlay) {
      mOverlay =
         std::make_shared<TrackPanelGuidelineOverlay>( mProject );
      auto pCellularPanel =
         dynamic_cast<CellularPanel*>( &GetProjectPanel( *GetProject() ) );
      if ( !pCellularPanel ) {
         wxASSERT( false );
      }
      else
         pCellularPanel->AddOverlay( mOverlay );
      this->AddOverlay( mOverlay->mPartner );
   }
}
 
void AdornedRulerPanel::TogglePinnedHead()
{
   bool value = !TracksPrefs::GetPinnedHeadPreference();
   TracksPrefs::SetPinnedHeadPreference(value, true);
   ToolManager::ModifyAllProjectToolbarMenus();
 
   auto &project = *mProject;
   // Update button image
   UpdateButtonStates();
 
   auto &scrubber = Scrubber::Get( project );
   if (scrubber.HasMark())
      scrubber.SetScrollScrubbing(value);
}
 
TimeDisplayMode AdornedRulerPanel::GetTimeDisplayMode() const
{
   return mTimeDisplayMode;
}
 
void AdornedRulerPanel::SetTimeDisplayMode(TimeDisplayMode type)
{
   if (mTimeDisplayMode == type)
      return;
 
   mTimeDisplayMode = type;
   TimeDisplayModePreference.WriteEnum(mTimeDisplayMode);
   Refresh();
}
 
// Attach menu item
 
#include "CommandContext.h"
#include "CommonCommandFlags.h"
 
namespace {
void OnTogglePinnedHead(const CommandContext &context)
{
   AdornedRulerPanel::Get( context.project ).TogglePinnedHead();
}
 
using namespace MenuRegistry;
AttachedItem sAttachment{
   Command( wxT("PinnedHead"), XXO("Enable pinned play &head"),
      OnTogglePinnedHead,
      // Switching of scrolling on and off is permitted
      // even during transport
      AlwaysEnabledFlag,
      Options{}.CheckTest([](const AudacityProject&){
         return TracksPrefs::GetPinnedHeadPreference(); } ) ),
   { wxT("Transport/Other/Options/Part2"), { OrderingHint::Begin, {} } }
};
}