Autres/audacity
1
0
Fork 0
mirror of https://github.com/cookiengineer/audacity synced 2025-05-04 17:49:45 +02:00
Code Issues Releases Wiki Activity

Reconcile DA & MIDI; TCP layout fixes; no invisible active controls

Browse Source 
Also fewer magic numbers in TrackPanel drawing code.

* TrackControls:
  Shift TCP status text down two pixels, leaving other controls unmoved
  Remove argument of DrawOutside that is no longer used...
  Don't overlap WaveTrack status and title bar by one pixel...
  Fix NoteTrack stray lines; no magic numbers in DrawBordersWithin...
  Hidden buttons and sliders in narrow tracks are never clickable
  Placement of minimize button and sync-lock icon are also table driven
  Don't overlap MIDI channel buttons with menu button & slider...
  CalcItemY is table-driven; stack Mute & Solo for NoteTrack too in DA
This commit is contained in:
Paul Licameli 2017-06-05 21:43:01 -04:00
commit ca62891dde
2 changed files with 235 additions and 129 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

344
src/TrackPanel.cpp
View File

@ -5176,6 +5176,134 @@ void TrackPanel::OnContextMenu(wxContextMenuEvent & WXUNUSED(event))
OnTrackMenu();
}
namespace {
enum : unsigned {
// The sequence is not significant, just keep bits distinct
kItemBarButtons = 1 << 0,
kItemStatusInfo1 = 1 << 1,
kItemMute = 1 << 2,
kItemSolo = 1 << 3,
kItemGain = 1 << 4,
kItemPan = 1 << 5,
kItemVelocity = 1 << 6,
kItemMidiControlsRect = 1 << 7,
kItemMinimize = 1 << 8,
kItemSyncLock = 1 << 9,
kItemStatusInfo2 = 1 << 10,
kHighestBottomItem = kItemMinimize,
};
struct TCPLine {
unsigned items; // a bitwise OR of values of the enum above
int height;
int extraSpace;
};
#ifdef EXPERIMENTAL_DA
#define TITLE_ITEMS(extra) \
{ kItemBarButtons, kTrackInfoBtnSize, 4 },
// DA: Does not have status information for a track.
#define STATUS_ITEMS
// DA: Has Mute and Solo on separate lines.
#define MUTE_SOLO_ITEMS(extra) \
{ kItemMute, kTrackInfoBtnSize + 1, 1 }, \
{ kItemSolo, kTrackInfoBtnSize + 1, extra },
#else
#define TITLE_ITEMS(extra) \
{ kItemBarButtons, kTrackInfoBtnSize, extra },
#define STATUS_ITEMS \
{ kItemStatusInfo1, 12, 4 }, \
{ kItemStatusInfo2, 12, 2 },
#define MUTE_SOLO_ITEMS(extra) \
{ kItemMute | kItemSolo, kTrackInfoBtnSize + 1, extra },
#endif
#define COMMON_ITEMS(extra) \
TITLE_ITEMS(extra)
const TCPLine commonTrackTCPLines[] = {
COMMON_ITEMS(0)
{ 0, 0, 0 }
};
const TCPLine waveTrackTCPLines[] = {
COMMON_ITEMS(2)
STATUS_ITEMS
MUTE_SOLO_ITEMS(2)
{ kItemGain, kTrackInfoSliderHeight, 5 },
{ kItemPan, kTrackInfoSliderHeight, 5 },
{ 0, 0, 0 }
};
const TCPLine noteTrackTCPLines[] = {
COMMON_ITEMS(0)
MUTE_SOLO_ITEMS(0)
{ kItemMidiControlsRect, kMidiCellHeight * 4, 0 },
{ kItemVelocity, kTrackInfoSliderHeight, 5 },
{ 0, 0, 0 }
};
const TCPLine *getTCPLines( const Track &track )
{
#ifdef USE_MIDI
if ( track.GetKind() == Track::Note )
return noteTrackTCPLines;
#endif
if ( track.GetKind() == Track::Wave )
return waveTrackTCPLines;
return commonTrackTCPLines;
}
// return y value and height
std::pair< int, int > CalcItemY( const TCPLine *pLines, unsigned iItem )
{
int y = 1;
while ( pLines->items &&
0 == (pLines->items & iItem) ) {
y += pLines->height + pLines->extraSpace;
++pLines;
}
return { y, pLines->height };
}
// Items for the bottom of the panel, listed bottom-upwards
// As also with the top items, the extra space is below the item
const TCPLine commonTrackTCPBottomLines[] = {
{ kItemSyncLock | kItemMinimize, kTrackInfoBtnSize, 1 },
{ 0, 0, 0 }
};
// return y value and height
std::pair< int, int > CalcBottomItemY
( const TCPLine *pLines, unsigned iItem, int height )
{
int y = height;
while ( pLines->items &&
0 == (pLines->items & iItem) ) {
y -= pLines->height + pLines->extraSpace;
++pLines;
}
return { y - (pLines->height + pLines->extraSpace ), pLines->height };
}
bool HideTopItem( const wxRect &rect, const wxRect &subRect ) {
auto limit = CalcBottomItemY
( commonTrackTCPBottomLines, kHighestBottomItem, rect.height).first;
// Return true if the rectangle is even touching the limit
// without an overlap. That was the behavior as of 2.1.3.
return subRect.y + subRect.height >= rect.y + limit;
}
}
/// This handles when the user clicks on the "Label" area
/// of a track, ie the part with all the buttons and the drop
/// down menu, etc.
@ -5247,7 +5375,8 @@ void TrackPanel::HandleLabelClick(wxMouseEvent & event)
bool isright = event.Button(wxMOUSE_BTN_RIGHT);
if ((isleft || isright) && midiRect.Contains(event.m_x, event.m_y) &&
if ( !HideTopItem( rect, midiRect ) &&
(isleft || isright) && midiRect.Contains(event.m_x, event.m_y) &&
static_cast<NoteTrack *>(t)->LabelClick(midiRect, event.m_x, event.m_y, isright)) {
MakeParentModifyState(false);
Refresh(false);
@ -5384,6 +5513,8 @@ bool TrackPanel::GainFunc(Track * t, wxRect rect, wxMouseEvent &event,
{
wxRect sliderRect;
mTrackInfo.GetGainRect(rect.GetTopLeft(), sliderRect);
if ( HideTopItem( rect, sliderRect ) )
return false;
if (!sliderRect.Contains(x, y))
return false;
@ -5399,6 +5530,8 @@ bool TrackPanel::PanFunc(Track * t, wxRect rect, wxMouseEvent &event,
{
wxRect sliderRect;
mTrackInfo.GetPanRect(rect.GetTopLeft(), sliderRect);
if ( HideTopItem( rect, sliderRect ) )
return false;
if (!sliderRect.Contains(x, y))
return false;
@ -5415,6 +5548,8 @@ bool TrackPanel::VelocityFunc(Track * t, wxRect rect, wxMouseEvent &event,
{
wxRect sliderRect;
mTrackInfo.GetVelocityRect(rect.GetTopLeft(), sliderRect);
if ( HideTopItem( rect, sliderRect ) )
return false;
if (!sliderRect.Contains(x, y))
return false;
@ -5435,6 +5570,8 @@ bool TrackPanel::MuteSoloFunc(Track * t, wxRect rect, int x, int y,
wxRect buttonRect;
rect.width +=4;
mTrackInfo.GetMuteSoloRect(rect, buttonRect, solo, HasSoloButton(), t);
if ( HideTopItem( rect, buttonRect ) )
return false;
if (!buttonRect.Contains(x, y))
return false;
@ -7157,16 +7294,16 @@ void TrackPanel::DrawEverythingElse(wxDC * dc,
// (and thus would have been skipped by VisibleTrackIterator) we need to
// draw that track's border instead.
Track *borderTrack = t;
wxRect borderRect = rect, borderTrackRect = trackRect;
wxRect borderRect = rect;
if (l && !t->GetLinked() && trackRect.y < 0)
{
borderTrack = l;
borderTrackRect.y = l->GetY() - mViewInfo->vpos;
borderTrackRect.height = l->GetHeight();
borderRect = trackRect;
borderRect.y = l->GetY() - mViewInfo->vpos;
borderRect.height = l->GetHeight();
borderRect = borderTrackRect;
borderRect.height += t->GetHeight();
}
@ -7174,7 +7311,7 @@ void TrackPanel::DrawEverythingElse(wxDC * dc,
if (mAx->IsFocused(t)) {
focusRect = borderRect;
}
DrawOutside(borderTrack, dc, borderRect, borderTrackRect);
DrawOutside(borderTrack, dc, borderRect);
}
// Believe it or not, we can speed up redrawing if we don't
@ -7283,9 +7420,7 @@ void TrackPanel::DrawZooming(wxDC * dc, const wxRect & clip)
dc->DrawRectangle(rect);
}
void TrackPanel::DrawOutside(Track * t, wxDC * dc, const wxRect & rec,
const wxRect & trackRect)
void TrackPanel::DrawOutside(Track * t, wxDC * dc, const wxRect & rec)
{
wxRect rect = rec;
int labelw = GetLabelWidth();
@ -7341,7 +7476,7 @@ void TrackPanel::DrawOutside(Track * t, wxDC * dc, const wxRect & rec,
true);
}
//mTrackInfo.DrawBordersWithin( dc, rect, bIsWave );
//mTrackInfo.DrawBordersWithin( dc, rect, *t );
auto wt = bIsWave ? static_cast<WaveTrack*>(t) : nullptr;
if (bIsWave) {
@ -7354,16 +7489,24 @@ void TrackPanel::DrawOutside(Track * t, wxDC * dc, const wxRect & rec,
#ifndef EXPERIMENTAL_DA
if (!t->GetMinimized()) {
int offset = 8;
if (rect.y + 22 + 12 < rec.y + rec.height - 19)
int offset = 4;
auto pair = CalcItemY( waveTrackTCPLines, kItemStatusInfo1 );
wxRect textRect {
rect.x + offset, rect.y + pair.first,
rect.width, pair.second
};
if ( !HideTopItem( rect, textRect ) )
dc->DrawText(TrackSubText(wt),
trackRect.x + offset,
trackRect.y + 22);
textRect.x, textRect.y);
if (rect.y + 38 + 12 < rec.y + rec.height - 19)
pair = CalcItemY( waveTrackTCPLines, kItemStatusInfo2 );
textRect = {
rect.x + offset, rect.y + pair.first,
rect.width, pair.second
};
if ( !HideTopItem( rect, textRect ) )
dc->DrawText(GetSampleFormatStr(((WaveTrack *) t)->GetSampleFormat()),
trackRect.x + offset,
trackRect.y + 38);
textRect.x, textRect.y );
}
#endif
}
@ -7373,14 +7516,8 @@ void TrackPanel::DrawOutside(Track * t, wxDC * dc, const wxRect & rec,
wxRect midiRect;
mTrackInfo.GetMidiControlsRect(rect, midiRect);
if (midiRect.y + midiRect.height < rect.y + rect.height - 19)
if ( !HideTopItem( rect, midiRect ) )
static_cast<NoteTrack *>(t)->DrawLabelControls(*dc, midiRect);
// Draw some lines for MuteSolo buttons (normally handled by DrawBordersWithin but not done for note tracks)
if (rect.height > 48) {
// Note: offset up by 34 units
AColor::Line(*dc, rect.x + 48, rect.y + 16, rect.x + 48, rect.y + 32); // between mute/solo
AColor::Line(*dc, rect.x, rect.y + 32, kTrackInfoWidth, rect.y + 32); // below mute/solo
}
mTrackInfo.DrawMuteSolo(dc, rect, t,
(captured && mMouseCapture == IsMuting), false, HasSoloButton());
mTrackInfo.DrawMuteSolo(dc, rect, t,
@ -9201,83 +9338,35 @@ int TrackInfo::GetTrackInfoWidth() const
return kTrackInfoWidth;
}
int TrackInfo::CalcItemY( int iItem ) const
{
int y = 1;
if( iItem == kItemBarButtons )
return y;
y+= kTrackInfoBtnSize +2;
if( iItem == kItemStatusInfo )
return y;
#ifdef EXPERIMENTAL_MIDI_OUT
int y1=y;
if( iItem == kItemNoteMute )
return y;
if( iItem == kItemNoteSolo )
return y;
y=y1;
#endif
// DA: Does not have status information for a track.
#ifndef EXPERIMENTAL_DA
y+= 30;
#else
y+= 2;
#endif
if( iItem == kItemMute )
return y;
// DA: Has Mute and Solo on separate lines.
#ifdef EXPERIMENTAL_DA
y+= kTrackInfoBtnSize + 2;
#endif
if( iItem == kItemSolo )
return y;
y+= kTrackInfoBtnSize + 3;
if( iItem == kItemGain )
return y;
y+= 30;
if( iItem == kItemPan )
return y;
y+= 30;
return y;
}
void TrackInfo::GetCloseBoxRect(const wxRect & rect, wxRect & dest) const
{
dest.x = rect.x+1;
dest.y = rect.y + CalcItemY( kItemBarButtons );
auto results = CalcItemY( commonTrackTCPLines, kItemBarButtons );
dest.y = rect.y + results.first;
dest.width = kTrackInfoBtnSize;
dest.height = kTrackInfoBtnSize;
dest.height = results.second;
}
void TrackInfo::GetTitleBarRect(const wxRect & rect, wxRect & dest) const
{
dest.x = rect.x + kTrackInfoBtnSize+2; // to right of CloseBoxRect
dest.y = rect.y + CalcItemY( kItemBarButtons );
auto results = CalcItemY( commonTrackTCPLines, kItemBarButtons );
dest.y = rect.y + results.first;
dest.width = kTrackInfoWidth - rect.x - kTrackInfoBtnSize-1; // to right of CloseBoxRect
dest.height = kTrackInfoBtnSize;
dest.height = results.second;
}
void TrackInfo::GetMuteSoloRect(const wxRect & rect, wxRect & dest, bool solo, bool bHasSoloButton, const Track *pTrack) const
{
dest.height = kTrackInfoBtnSize +1;
dest.x = rect.x+1;
int MuteSoloType = 0;
auto resultsM = CalcItemY( getTCPLines( *pTrack ), kItemMute );
auto resultsS = CalcItemY( getTCPLines( *pTrack ), kItemSolo );
dest.height = resultsS.second;
#ifdef EXPERIMENTAL_MIDI_OUT
if (pTrack->GetKind() == Track::Note)
MuteSoloType = kItemNoteMute - kItemMute;
#endif
int yMute = CalcItemY( kItemMute + MuteSoloType );
int ySolo = CalcItemY( kItemSolo + MuteSoloType );
int yMute = resultsM.first;
int ySolo = resultsS.first;
bool bSameRow = ( yMute == ySolo );
bool bNarrow = bSameRow && bHasSoloButton;
@ -9306,24 +9395,27 @@ void TrackInfo::GetMuteSoloRect(const wxRect & rect, wxRect & dest, bool solo, b
void TrackInfo::GetGainRect(const wxPoint &topleft, wxRect & dest) const
{
dest.x = topleft.x + 7;
dest.y = topleft.y + CalcItemY( kItemGain );
auto results = CalcItemY( waveTrackTCPLines, kItemGain );
dest.y = topleft.y + results.first;
dest.width = 84;
dest.height = 25;
dest.height = results.second;
}
void TrackInfo::GetPanRect(const wxPoint &topleft, wxRect & dest) const
{
GetGainRect( topleft, dest );
dest.y = topleft.y + CalcItemY( kItemPan );
auto results = CalcItemY( waveTrackTCPLines, kItemPan );
dest.y = topleft.y + results.first;
}
#ifdef EXPERIMENTAL_MIDI_OUT
void TrackInfo::GetVelocityRect(const wxPoint &topleft, wxRect & dest) const
{
dest.x = topleft.x + 7;
dest.y = topleft.y + 100;
auto results = CalcItemY( noteTrackTCPLines, kItemVelocity );
dest.y = topleft.y + results.first;
dest.width = 84;
dest.height = 25;
dest.height = results.second;
}
#endif
@ -9331,18 +9423,22 @@ void TrackInfo::GetMinimizeRect(const wxRect & rect, wxRect &dest) const
{
const int kBlankWidth = kTrackInfoBtnSize + 4;
dest.x = rect.x + 4;
dest.y = rect.y + rect.height - 19;
auto results = CalcBottomItemY
( commonTrackTCPBottomLines, kItemMinimize, rect.height);
dest.y = rect.y + results.first;
// Width is kTrackInfoWidth less space on left for track select and on right for sync-lock icon.
dest.width = kTrackInfoWidth - (1.2 * kBlankWidth);
dest.height = kTrackInfoBtnSize;
dest.height = results.second;
}
void TrackInfo::GetSyncLockIconRect(const wxRect & rect, wxRect &dest) const
{
dest.x = rect.x + kTrackInfoWidth - kTrackInfoBtnSize - 4; // to right of minimize button
dest.y = rect.y + rect.height - 19;
auto results = CalcBottomItemY
( commonTrackTCPBottomLines, kItemSyncLock, rect.height);
dest.y = rect.y + results.first;
dest.width = kTrackInfoBtnSize;
dest.height = kTrackInfoBtnSize;
dest.height = results.second;
}
#ifdef USE_MIDI
@ -9350,8 +9446,9 @@ void TrackInfo::GetMidiControlsRect(const wxRect & rect, wxRect & dest) const
{
dest.x = rect.x + 2; // To center slightly
dest.width = kMidiCellWidth * 4;
dest.y = rect.y + 34;
dest.height = kMidiCellHeight * 4;
auto results = CalcItemY( noteTrackTCPLines, kItemMidiControlsRect );
dest.y = rect.y + results.first;
dest.height = results.second;
}
#endif
@ -9361,30 +9458,55 @@ void TrackInfo::SetTrackInfoFont(wxDC * dc) const
dc->SetFont(mFont);
}
void TrackInfo::DrawBordersWithin(wxDC* dc, const wxRect & rect, bool bHasMuteSolo) const
void TrackInfo::DrawBordersWithin
( wxDC* dc, const wxRect & rect, const Track &track ) const
{
AColor::Dark(dc, false); // same color as border of toolbars (ToolBar::OnPaint())
// below close box and title bar
AColor::Line(*dc, rect.x, rect.y + kTrackInfoBtnSize, kTrackInfoWidth, rect.y + kTrackInfoBtnSize);
wxRect buttonRect;
GetTitleBarRect( rect, buttonRect );
AColor::Line
(*dc, rect.x, buttonRect.y + buttonRect.height,
kTrackInfoWidth, buttonRect.y + buttonRect.height);
// between close box and title bar
AColor::Line(*dc, rect.x + kTrackInfoBtnSize, rect.y, rect.x + kTrackInfoBtnSize, rect.y + kTrackInfoBtnSize);
AColor::Line
(*dc, buttonRect.x, buttonRect.y,
buttonRect.x, buttonRect.y + buttonRect.height);
if( bHasMuteSolo && (rect.height > (66+18) ))
GetMuteSoloRect( rect, buttonRect, false, true, &track );
bool bHasMuteSolo = dynamic_cast<const PlayableTrack*>( &track );
if( bHasMuteSolo && !HideTopItem( rect, buttonRect ) )
{
AColor::Line(*dc, rect.x, rect.y + 50, kTrackInfoWidth, rect.y + 50); // above mute/solo
AColor::Line(*dc, rect.x + 48 , rect.y + 50, rect.x + 48, rect.y + 66); // between mute/solo
AColor::Line(*dc, rect.x, rect.y + 66, kTrackInfoWidth, rect.y + 66); // below mute/solo
// above mute/solo
AColor::Line
(*dc, rect.x, buttonRect.y,
kTrackInfoWidth, buttonRect.y);
// between mute/solo
// Draw this little line; if there is no solo, wide mute button will
// overpaint it later:
AColor::Line
(*dc, buttonRect.x + buttonRect.width, buttonRect.y,
buttonRect.x + buttonRect.width, buttonRect.y + buttonRect.height);
// below mute/solo
AColor::Line
(*dc, rect.x, buttonRect.y + buttonRect.height,
kTrackInfoWidth, buttonRect.y + buttonRect.height);
}
// left of and above minimize button
wxRect minimizeRect;
this->GetMinimizeRect(rect, minimizeRect);
AColor::Line(*dc, minimizeRect.x - 1, minimizeRect.y,
minimizeRect.x - 1, minimizeRect.y + minimizeRect.height);
AColor::Line(*dc, minimizeRect.x, minimizeRect.y - 1,
minimizeRect.x + minimizeRect.width, minimizeRect.y - 1);
AColor::Line
(*dc, minimizeRect.x - 1, minimizeRect.y,
minimizeRect.x - 1, minimizeRect.y + minimizeRect.height);
AColor::Line
(*dc, minimizeRect.x, minimizeRect.y - 1,
minimizeRect.x + minimizeRect.width, minimizeRect.y - 1);
}
//#define USE_BEVELS
@ -9514,7 +9636,7 @@ void TrackInfo::DrawMuteSolo(wxDC * dc, const wxRect & rect, Track * t,
return;
GetMuteSoloRect(rect, bev, solo, bHasSoloButton, t);
//bev.Inflate(-1, -1);
if (bev.y + bev.height >= rect.y + rect.height - 19)
if ( HideTopItem( rect, bev ) )
return; // don't draw mute and solo buttons, because they don't fit into track label
auto pt = dynamic_cast<const PlayableTrack *>(t);
@ -9596,18 +9718,14 @@ void TrackInfo::DrawMinimize(wxDC * dc, const wxRect & rect, Track * t, bool dow
void TrackInfo::DrawSliders(wxDC *dc, WaveTrack *t, wxRect rect, bool captured) const
{
wxRect sliderRect;
// Larger slidermargin means it disappears sooner on collapsing track.
const int sliderMargin = 14;
GetGainRect(rect.GetTopLeft(), sliderRect);
if (sliderRect.y + sliderRect.height < rect.y + rect.height - sliderMargin) {
if ( !HideTopItem( rect, sliderRect ) )
GainSlider(t, captured)->OnPaint(*dc);
}
GetPanRect(rect.GetTopLeft(), sliderRect);
if (sliderRect.y + sliderRect.height < rect.y + rect.height - sliderMargin) {
if ( !HideTopItem( rect, sliderRect ) )
PanSlider(t, captured)->OnPaint(*dc);
}
}
#ifdef EXPERIMENTAL_MIDI_OUT
@ -9616,7 +9734,7 @@ void TrackInfo::DrawVelocitySlider(wxDC *dc, NoteTrack *t, wxRect rect, bool cap
wxRect sliderRect;
GetVelocityRect(rect.GetTopLeft(), sliderRect);
if (sliderRect.y + sliderRect.height < rect.y + rect.height - 19) {
if ( !HideTopItem( rect, sliderRect ) ) {
VelocitySlider(t, captured)->OnPaint(*dc);
}
}

20
src/TrackPanel.h
View File

@ -76,17 +76,6 @@ enum {
kTimerInterval = 50, // milliseconds
};
enum {
kItemBarButtons = 0,
kItemStatusInfo = 1,
kItemMute = 2,
kItemSolo = 3,
kItemNoteMute = 4,
kItemNoteSolo = 5,
kItemGain = 6,
kItemPan = 7,
};
class AUDACITY_DLL_API TrackInfo
{
public:
@ -95,13 +84,12 @@ public:
void ReCreateSliders();
private:
int CalcItemY( int iItem ) const;
int GetTrackInfoWidth() const;
void SetTrackInfoFont(wxDC *dc) const;
void DrawBackground(wxDC * dc, const wxRect & rect, bool bSelected, bool bHasMuteSolo, const int labelw, const int vrul) const;
void DrawBordersWithin(wxDC * dc, const wxRect & rect, bool bHasMuteSolo ) const;
void DrawBordersWithin(wxDC * dc, const wxRect & rect, const Track &track ) const;
void DrawCloseBox(wxDC * dc, const wxRect & rect, Track * t, bool down) const;
void DrawTitleBar(wxDC * dc, const wxRect & rect, Track * t, bool down) const;
void DrawMuteSolo(wxDC * dc, const wxRect & rect, Track * t, bool down, bool solo, bool bHasSoloButton) const;
@ -596,8 +584,7 @@ protected:
virtual void DrawEverythingElse(wxDC *dc, const wxRegion & region,
const wxRect & clip);
virtual void DrawOutside(Track *t, wxDC *dc, const wxRect & rec,
const wxRect &trackRect);
virtual void DrawOutside(Track *t, wxDC *dc, const wxRect & rec);
virtual void DrawZooming(wxDC* dc, const wxRect & clip);
virtual void HighlightFocusedTrack (wxDC* dc, const wxRect &rect);
@ -934,7 +921,8 @@ enum : int {
enum : int {
kTrackInfoWidth = 100,
kTrackInfoBtnSize = 18 // widely used dimension, usually height
kTrackInfoBtnSize = 18, // widely used dimension, usually height
kTrackInfoSliderHeight = 25,
};
#ifdef USE_MIDI