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/**********************************************************************
Audacity: A Digital Audio Editor
Snap.h
Dominic Mazzoni
Create one of these objects at the beginning of a click/drag.
Then, given a time corresponding to the current mouse cursor
position, it will tell you the closest place to snap to.
**********************************************************************/
#ifndef __AUDACITY_SNAP__
#define __AUDACITY_SNAP__
#include <vector>
#include <wx/defs.h>
#include "ComponentInterfaceSymbol.h"
class AudacityProject;
class Track;
class TrackList;
class ZoomInfo;
class wxDC;
const int kPixelTolerance = 4;
class SnapPoint
{
public:
explicit
SnapPoint(double t_ = 0.0, const Track *track_ = nullptr)
: t(t_), track(track_)
{
}
double t;
const Track *track;
};
using SnapPointArray = std::vector < SnapPoint > ;
struct SnapResults {
double timeSnappedTime{ 0.0 };
double outTime{ 0.0 };
wxInt64 outCoord{ -1 };
bool snappedPoint{ false };
bool snappedTime{ false };
bool Snapped() const { return snappedPoint || snappedTime; }
};
class SNAPPING_API SnapManager
{
public:
//! Construct only for specified candidate points
SnapManager(const AudacityProject &project,
SnapPointArray candidates,
const ZoomInfo &zoomInfo,
bool noTimeSnap = false,
int pixelTolerance = kPixelTolerance);
//! Construct for (optionally) specified points, plus significant points
//! on the tracks in the given list
SnapManager(const AudacityProject &project,
const TrackList &tracks,
const ZoomInfo &zoomInfo,
SnapPointArray candidates = {},
bool noTimeSnap = false,
int pixelTolerance = kPixelTolerance);
~SnapManager();
// The track may be NULL.
// Returns true if the output time is not the same as the input.
// Pass rightEdge=true if this is the right edge of a selection,
// and false if it's the left edge.
SnapResults Snap(Track *currentTrack,
double t,
bool rightEdge);
private:
void Reinit();
void CondListAdd(double t, const Track *track);
double Get(size_t index);
wxInt64 PixelDiff(double t, size_t index);
size_t Find(double t, size_t i0, size_t i1);
size_t Find(double t);
bool SnapToPoints(Track *currentTrack, double t, bool rightEdge, double *outT);
private:
const AudacityProject *mProject;
const ZoomInfo *mZoomInfo;
int mPixelTolerance;
bool mNoTimeSnap;
//! Two time points closer than this are considered the same
double mEpsilon{ 1 / 44100.0 };
SnapPointArray mCandidates;
SnapPointArray mSnapPoints;
// Info for snap-to-time
bool mSnapToTime{ false };
Identifier mSnapTo {};
double mRate{ 0.0 };
NumericFormatID mFormat{};
};
#endif
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