WaveClipTrimHandle.h

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/*!********************************************************************
*
 Audacity: A Digital Audio Editor
 
 WaveClipTrimHandle.h
 
 Vitaly Sverchinsky
 
 **********************************************************************/
 
#pragma once 
 
#include "UIHandle.h"
#include "WaveClip.h"
 
class WaveChannelView;
class WaveTrack;
 
class WaveClipTrimHandle : public UIHandle
{
    static constexpr int BoundaryThreshold = 5;
 
    static HitTestPreview HitPreview(const AudacityProject*, bool unsafe);
 
    //Different policies implement different trimming scenarios
    class ClipTrimPolicy
    {
    public:
       virtual ~ClipTrimPolicy();
 
       virtual bool Init(const TrackPanelMouseEvent& event) = 0;
       virtual UIHandle::Result Trim(const TrackPanelMouseEvent& event, AudacityProject& project) = 0;
       virtual void Finish(AudacityProject& project) = 0;
       virtual void Cancel() = 0;
 
       virtual void Draw(
           TrackPanelDrawingContext &context, 
           const wxRect &rect, 
           unsigned iPass);
 
       virtual wxRect DrawingArea(
           TrackPanelDrawingContext&, 
           const wxRect &rect, 
           const wxRect &panelRect, 
           unsigned iPass);
    };
    class AdjustBorder;
    class AdjustBetweenBorders;
    
    std::unique_ptr<ClipTrimPolicy> mClipTrimPolicy{};
 
public:
    WaveClipTrimHandle(std::unique_ptr<ClipTrimPolicy>& clipTrimPolicy);
 
    static UIHandlePtr HitAnywhere(std::weak_ptr<WaveClipTrimHandle>& holder,
        const std::shared_ptr<WaveTrack>& waveTrack,
        const AudacityProject* pProject,
        const TrackPanelMouseState& state);
 
    static UIHandlePtr HitTest(std::weak_ptr<WaveClipTrimHandle>& holder,
        WaveChannelView& view, const AudacityProject* pProject,
        const TrackPanelMouseState& state);
 
    HitTestPreview Preview(const TrackPanelMouseState& mouseState, AudacityProject* pProject) override;
 
    Result Click
    (const TrackPanelMouseEvent& event, AudacityProject* pProject) override;
 
    Result Drag
    (const TrackPanelMouseEvent& event, AudacityProject* pProject) override;
 
    Result Release
    (const TrackPanelMouseEvent& event, AudacityProject* pProject,
        wxWindow* pParent) override;
 
    Result Cancel(AudacityProject* pProject) override;
 
    // TrackPanelDrawable implementation
 
    void Draw(TrackPanelDrawingContext &context,
        const wxRect &rect,
        unsigned iPass ) override;
 
    wxRect DrawingArea(TrackPanelDrawingContext&,
        const wxRect &rect,
        const wxRect &panelRect,
        unsigned iPass) override;
};