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Code Issues Releases Wiki Activity

Bug1197: keep selection on the screen at extreme repeated zoom-in

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This commit is contained in:
Paul Licameli 2016-06-28 03:39:15 -04:00
parent f4aee7948f
commit 12d22cafc6
1 changed files with 26 additions and 12 deletions
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32
src/Project.cpp
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@ -1551,6 +1551,10 @@ void AudacityProject::OnScrollLeft()
// move at least one scroll increment
pos -= wxMax((wxInt64)(sbarHjump * mViewInfo.sbarScale), 1);
pos = wxMax(pos, 0);
mViewInfo.sbarH -= sbarHjump;
mViewInfo.sbarH = std::max(mViewInfo.sbarH,
-(wxInt64) PixelWidthBeforeTime(0.0));
if (pos != mHsbar->GetThumbPosition()) {
mHsbar->SetThumbPosition((int)pos);
@ -1570,6 +1574,10 @@ void AudacityProject::OnScrollRight()
pos += wxMax((wxInt64)(sbarHjump * mViewInfo.sbarScale), 1);
wxInt64 max = mHsbar->GetRange() - mHsbar->GetThumbSize();
pos = wxMin(pos, max);
mViewInfo.sbarH += sbarHjump;
mViewInfo.sbarH = std::min(mViewInfo.sbarH,
mViewInfo.sbarTotal
- (wxInt64) PixelWidthBeforeTime(0.0) - mViewInfo.sbarScreen);
if (pos != mHsbar->GetThumbPosition()) {
mHsbar->SetThumbPosition((int)pos);
@ -1586,6 +1594,9 @@ void AudacityProject::OnScrollLeftButton(wxScrollEvent & event)
// move at least one scroll increment
pos -= wxMax((wxInt64)(sbarHjump * mViewInfo.sbarScale), 1);
pos = wxMax(pos, 0);
mViewInfo.sbarH -= sbarHjump;
mViewInfo.sbarH = std::max(mViewInfo.sbarH,
- (wxInt64) PixelWidthBeforeTime(0.0));
if (pos != mHsbar->GetThumbPosition()) {
mHsbar->SetThumbPosition((int)pos);
@ -1604,6 +1615,10 @@ void AudacityProject::OnScrollRightButton(wxScrollEvent & event)
pos += wxMax((wxInt64)(sbarHjump * mViewInfo.sbarScale), 1);
wxInt64 max = mHsbar->GetRange() - mHsbar->GetThumbSize();
pos = wxMin(pos, max);
mViewInfo.sbarH += sbarHjump;
mViewInfo.sbarH = std::min(mViewInfo.sbarH,
mViewInfo.sbarTotal
- (wxInt64) PixelWidthBeforeTime(0.0) - mViewInfo.sbarScreen);
if (pos != mHsbar->GetThumbPosition()) {
mHsbar->SetThumbPosition((int)pos);
@ -1650,12 +1665,19 @@ double AudacityProject::PixelWidthBeforeTime(double scrollto) const
void AudacityProject::SetHorizontalThumb(double scrollto)
{
const auto unscaled = PixelWidthBeforeTime(scrollto);
const int max = mHsbar->GetRange() - mHsbar->GetThumbSize();
const int pos =
std::min(max,
std::max(0,
int(floor(0.5 + PixelWidthBeforeTime(scrollto) * mViewInfo.sbarScale))));
int(floor(0.5 + unscaled * mViewInfo.sbarScale))));
mHsbar->SetThumbPosition(pos);
mViewInfo.sbarH = floor(0.5 + unscaled - PixelWidthBeforeTime(0.0));
mViewInfo.sbarH = std::max(mViewInfo.sbarH,
- (wxInt64) PixelWidthBeforeTime(0.0));
mViewInfo.sbarH = std::min(mViewInfo.sbarH,
mViewInfo.sbarTotal
- (wxInt64) PixelWidthBeforeTime(0.0) - mViewInfo.sbarScreen);
}
//
@ -2066,19 +2088,11 @@ void AudacityProject::OnODTaskComplete(wxCommandEvent & WXUNUSED(event))
void AudacityProject::OnScroll(wxScrollEvent & WXUNUSED(event))
{
const wxInt64 hlast = mViewInfo.sbarH;
const double lowerBound = ScrollingLowerBoundTime();
const wxInt64 offset = PixelWidthBeforeTime(0.0);
mViewInfo.sbarH =
(wxInt64)(mHsbar->GetThumbPosition() / mViewInfo.sbarScale) - offset;
if (mViewInfo.sbarH != hlast) {
int width;
mTrackPanel->GetTracksUsableArea(&width, NULL);
mViewInfo.SetBeforeScreenWidth(mViewInfo.sbarH, width, lowerBound);
}
if (MayScrollBeyondZero()) {