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Fix problem with waveform disappearing when zooming in using mouse wheel. Aligns audio right with mouse position, if mouse position is to right of audio right.

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james.k.crook@gmail.com 2012-05-06 11:50:29 +00:00
parent dfcda8dfaf
commit 4dc68db335
1 changed files with 19 additions and 2 deletions
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21
src/TrackPanel.cpp
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@ -4678,11 +4678,28 @@ void TrackPanel::HandleWheelRotation(wxMouseEvent & event)
p->ZoomOutByFactor( ZoomFactor );
#endif
// MM: Zoom in/out when used with Control key down
// MM: I don't understand what trackLeftEdge does
// We're converting pixel positions to times,
// counting pixels from the left edge of the track.
int trackLeftEdge = GetLeftOffset();
// Time corresponding to mouse position
double center_h = PositionToTime(event.m_x, trackLeftEdge);
mViewInfo->zoom = wxMin(mViewInfo->zoom * pow(2.0, steps), gMaxZoom);
// Time corresponding to last (most far right) audio.
double audioEndTime = mTracks->GetEndTime();
// When zooming in in empty space, it's easy to 'lose' the waveform.
// This prevents it.
// IF zooming in
if( steps > 0)
{
// IF mouse is to right of audio
if( center_h > audioEndTime )
// Zooming brings far right of audio to mouse.
center_h = audioEndTime;
}
// Constrain maximum as well as minimum zoom.
mViewInfo->zoom = wxMax( gMinZoom, wxMin(mViewInfo->zoom * pow(2.0, steps), gMaxZoom));
double new_center_h = PositionToTime(event.m_x, trackLeftEdge);
mViewInfo->h += (center_h - new_center_h);