AutoHeightSpacer.c

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// -----------------------------------------------------------
class AutoHeightSpacer : ScriptedWidgetEventHandler
{
  reference bool AlignChilds;
  reference int MinHeight;
  reference int MaxHeight;
  reference int Gap;
  reference float Top;
  protected Widget m_root;
 
  void Update()
  {
    float x = 0;
    float y = 0;
    float width = 0;
    float height = 0;
    float heightOld = 0;
    float top = Top;
    float rowRight;
    float rowHeight;
    float rowWidth;
    Widget child = m_root.GetChildren();
 
    //PrintString(m_root.GetName() + ": AutoHeightSpacer::Update()");
 
    if (!AlignChilds) top = -100000;
 
    if (child != NULL)
    {
      // first row init
      m_root.GetScreenSize(rowWidth, height);
      rowHeight = 0;
      rowRight = rowWidth;
 
      while (child)
      {
        if (child.IsVisible() == false || child.GetName() == "SelectedContainer" || child.GetName() == "Icon")
        {
          // skip invisible widgets
          child = child.GetSibling();
          continue;
        }
 
        child.GetScreenSize(width, height);
 
        if (AlignChilds)
        {
          child.SetFlags(WidgetFlags.EXACTPOS, false);
 
          // no space left in this row, move to next one
          if (rowRight < width)
          {
            top += rowHeight;
            if (rowHeight > 0) top += Gap;
            rowRight = rowWidth;
            rowHeight = 0;
          }
 
          // increase row height if necessary
          if (height > rowHeight) rowHeight = height;
 
          child.SetPos(rowWidth - rowRight, top, false);
          rowRight -= width + Gap;
        }
        else
        {
          child.GetScreenPos(x, y);
          y += height;
          if (top < y) top = y;
        }
 
        child = child.GetSibling();
      }
 
      // add last row height;
      top += rowHeight;
 
      if (AlignChilds)
        height = top;
      else
      {
        m_root.GetScreenPos(x, y);
        height = top - y;
      }
    }
 
    m_root.GetSize(width, heightOld);
 
    if (MaxHeight > 0 && height > MaxHeight)
      height = MaxHeight;
 
    if (MinHeight > height)
      height = MinHeight;
 
    if (Math.AbsInt(heightOld - height) > 1)
      m_root.SetSize(width, height);
    else if (AlignChilds)
      m_root.Update();
 
    return;
  }
 
  void OnWidgetScriptInit(Widget w)
  {
    m_root = w;
    m_root.SetHandler(this);
    m_root.SetFlags(WidgetFlags.VEXACTPOS);
    Update();
  }
 
  override bool OnChildRemove(Widget w, Widget child)
  {
    if (w == m_root)
      Update();
 
    return false;
  }
};