TrackInfo.cpp

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/**********************************************************************
 
Audacity: A Digital Audio Editor
 
TrackInfo.cpp
 
Paul Licameli split from TrackPanel.cpp
 
 
**********************************************************************/
 
 
#include "TrackInfo.h"
 
#include <wx/app.h>
#include <wx/dc.h>
#include <wx/font.h>
#include <wx/window.h>
 
#include "AColor.h"
#include "AllThemeResources.h"
#include "PlayableTrack.h"
#include "Prefs.h"
#include "Project.h"
#include "SyncLock.h"
#include "Theme.h"
#include "TrackPanelDrawingContext.h"
#include "UIHandle.h"
#include "ViewInfo.h"
#include "tracks/ui/ChannelView.h"
 
// Subscribe to preference changes to update static variables
struct Settings : PrefsListener {
   wxFont gFont;
 
   bool mInitialized{ false };
 
   void UpdatePrefs() override
   {
      // Calculation of best font size depends on language, so it should be redone in case
      // the language preference changed.
 
      // wxWidgets seems to need a window to do this portably.
      if ( !wxTheApp )
         return;
      auto window = wxTheApp->GetTopWindow();
      if ( !window )
         return;
 
      int fontSize = 10;
      gFont.Create(fontSize, wxFONTFAMILY_SWISS, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL);
 
      int allowableWidth =
         // PRL:  was it correct to include the margin?
         ( kTrackInfoWidth + kLeftMargin )
            - 2; // 2 to allow for left/right borders
      int textWidth;
      do {
         gFont.SetPointSize(fontSize);
         window->GetTextExtent(_("Stereo, 999999Hz"),
            &textWidth, nullptr, nullptr, nullptr, &gFont);
         fontSize--;
      } while (textWidth >= allowableWidth);
 
      mInitialized = true;
   }
};
 
static Settings &settings()
{
   static Settings theSettings;
   if ( !theSettings.mInitialized )
      theSettings.UpdatePrefs();
   return theSettings;
}
 
// return y value and height
std::pair< int, int >
TrackInfo::CalcItemY( const TCPLines &lines, unsigned iItem )
{
   int y = 0;
   auto pLines = lines.begin();
   while ( pLines != lines.end() &&
           0 == (pLines->items & iItem) ) {
      y += pLines->height + pLines->extraSpace;
      ++pLines;
   }
   int height = 0;
   if ( pLines != lines.end() )
      height = pLines->height;
   return { y, height };
}
 
void TrackInfo::SetTrackInfoFont(wxDC * dc)
{
   dc->SetFont(settings().gFont);
}