track-head-widget.hpp

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/*
  TRACK-HEAD-WIDGET.hpp  -  display of track heads within the timeline

   Copyright (C)
     2016,            Hermann Vosseler <Ichthyostega@web.de>

  **Lumiera** is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by the
  Free Software Foundation; either version 2 of the License, or (at your
  option) any later version. See the file COPYING for further details.

*/


#ifndef STAGE_TIMELINE_TRACK_HEAD_WIDGET_H
#define STAGE_TIMELINE_TRACK_HEAD_WIDGET_H

#include "stage/gtk-base.hpp"
#include "stage/ctrl/bus-term.hpp"
#include "stage/model/view-hook.hpp"
#include "stage/widget/element-box-widget.hpp"
#include "stage/timeline/stave-bracket-widget.hpp"




namespace stage  {
namespace timeline {
  
  using ID = ctrl::BusTerm::ID;
  
  class HeadControlArea
    : public Gtk::Grid
    {
      Gtk::Label ctrlTODO_;
      
    public:
      HeadControlArea();
     ~HeadControlArea();
    };
  
  class TrackHeadWidget
    : public Gtk::Grid
    , public model::ViewHook<TrackHeadWidget>
    {
      widget::ElementBoxWidget trackName_;
      StaveBracketWidget structure_;
      Gtk::Box   padding_;
      HeadControlArea headCtrl_;
      
      uint childCnt_;
      
      /* ==== Interface: ViewHook ===== */
      
      void hook   (TrackHeadWidget&)          override;
      void remove (TrackHeadWidget&)          override;
      void rehook (TrackHeadWidget&) noexcept override;
      
    public:
      TrackHeadWidget();
     ~TrackHeadWidget();
      
      void setTrackName (cuString&);
      
      uint getContentHeight() const;
      uint getOverallHeight() const;
      
      void accommodateContentHeight(uint);
      void accommodateOverallHeight(uint);
      void syncSubtrackStartHeight (uint);

    private:/* ===== Internals ===== */
      
      void attachSubFork (TrackHeadWidget& subForkHead);
      void detachSubFork (TrackHeadWidget& subForkHead);

      void clearFork();
      
      void linkSubTrackPositions (uint);
      
      uint getHeightAt (int left, int top)  const;
      void enforceHeightAt(int left, int top, uint height);

      uint getExpansionHeight() const { return getHeightAt (0,1); };
      uint getSyncPadHeight()   const { return getHeightAt (1,2); };
      uint getLabelHeight()     const { return getHeightAt (0,0); };
      
      void enforceContentHeight  (uint h){ enforceHeightAt (1,1, h); }
      void enforceSyncPadHeight  (uint h){ enforceHeightAt (1,2, h); }
      void enforceExpansionHeight(uint h){ enforceHeightAt (0,1, h); }
    };

  
  inline uint
  TrackHeadWidget::getContentHeight() const
  {
    return getHeightAt (1,1);
  }
  
  
}}// namespace stage::timeline
#endif /*STAGE_TIMELINE_TRACK_HEAD_WIDGET_H*/