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Bug 1292 - Enh: Zoom Normal (Ctrl+2) may move selection off screen

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Selection is now centred after any zoom, if it will fit on screen.
This commit is contained in:
James Crook 2017-08-05 17:46:52 +01:00
parent 7a5bbbcce8
commit eee58d9449
1 changed files with 10 additions and 0 deletions
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10
src/Project.cpp
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@ -4673,6 +4673,16 @@ void AudacityProject::Zoom(double level)
{
mViewInfo.SetZoom(level);
FixScrollbars();
// See if we can center the selection on screen, and have it actually fit.
// tOnLeft is the amount of time we would need before the selection left edge to center it.
float t0 = mViewInfo.selectedRegion.t0();
float t1 = mViewInfo.selectedRegion.t1();
float tAvailable = GetScreenEndTime() - mViewInfo.h;
float tOnLeft = (tAvailable - t0 + t1)/2.0;
// Bug 1292 (Enh) is effectively a request to do this scrolling of the selection into view.
// If tOnLeft is positive, then we have room for the selection, so scroll to it.
if( tOnLeft >=0 )
TP_ScrollWindow( t0-tOnLeft);
}
// Utility function called by other zoom methods