TrackPanelResizeHandle.h

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/**********************************************************************
 
Audacity: A Digital Audio Editor
 
TrackPanelResizeHandle.h
 
Paul Licameli split from TrackPanel.cpp
 
**********************************************************************/
 
#ifndef __AUDACITY_TRACK_PANEL_RESIZE_HANDLE__
#define __AUDACITY_TRACK_PANEL_RESIZE_HANDLE__
 
#include "UIHandle.h"
 
class Channel;
class Track;
 
class TrackPanelResizeHandle final : public UIHandle
{
   TrackPanelResizeHandle(const TrackPanelResizeHandle&) = delete;
 
public:
   TrackPanelResizeHandle(const std::shared_ptr<Channel> &pChannel, int y);
 
   TrackPanelResizeHandle &operator=(const TrackPanelResizeHandle&) = default;
 
   static HitTestPreview HitPreview(bool bLinked);
 
   virtual ~TrackPanelResizeHandle();
 
   std::shared_ptr<const Track> FindTrack() const override;
   std::shared_ptr<Channel> FindChannel();
 
   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;
 
private:
   static Track &GetTrack(Channel &channel);
   Channel *PrevChannel(Channel &channel);
   Channel *NextChannel(Channel &channel);
 
   enum Mode {
      IsResizing,
      IsResizingBetweenLinkedTracks,
      IsResizingBelowLinkedTracks,
   };
   Mode mMode{ IsResizing };
 
   std::weak_ptr<Channel> mwChannel;
 
   bool mInitialMinimized{};
   int mInitialTrackHeight{};
   int mInitialExpandedHeight{};
   int mInitialUpperTrackHeight{};
   int mInitialUpperExpandedHeight{};
 
   int mMouseClickY{};
};
 
#endif