internal virtual int OnIdle()

in vsintegration/src/FSharp.LanguageService.Base/LanguageService.cs [348:398]
45 lines of code
16 McCabe index (conditional complexity)

        internal virtual int OnIdle(bool periodic, IOleComponentManager mgr)
        {
            if (!this.IsActive)
                return 0;

            // here's our chance to synchronize combo's and so on, 
            // first we see if the caret has moved.                
            IVsTextView view = this.lastActiveView;
            if (view == null) return 0;
            ISource s = this.GetSource(view);
            if (s == null) return 0;

            int line = -1, col = -1;
            var hr = view.GetCaretPos(out line, out col);
            if (NativeMethods.Failed(hr))
                return 0;

            if (line != this.lastLine || col != this.lastCol || this.lastFileName == null)
            {
                this.lastLine = line;
                this.lastCol = col;
                this.lastFileName = s.GetFilePath();
                CodeWindowManager cwm = this.GetCodeWindowManagerForView(view);
                if (cwm != null)
                {
                    this.OnCaretMoved(cwm, view, line, col);
                }
            }
            s.OnIdle(periodic);  // do idle processing for currently-focused file
            bool moreToDo = false;
#if CHECK_ALL_DIRTY_FILES_ON_PERIODIC_IDLE
            if (periodic && mgr.FContinueIdle() != 0)
            {
                // while there is spare idle time, pick a dirty file (if there is one) and do idle processing for it
                for (int i = 0; i < this.sources.Count; ++i)
                {
                    Source so = this.sources[i] as Source;
                    if (so != null && so.IsDirty)
                    {
                        so.OnIdle(periodic);
                        if (mgr.FContinueIdle() == 0)
                        {
                            moreToDo = true;
                            break;
                        }
                    }
                }
            }
#endif
            return moreToDo ? 1 : 0;
        }