openglplayground/LinearLayout.cc

#include "LinearLayout.hh"

LinearLayout::LinearLayout(int direction, int width, int height, std::string name)
  : View(width, height, std::move(name)), direction_(direction), padChildren_(0)
{
}

LinearLayout::~LinearLayout()
{
}

void LinearLayout::setChildPadding(int pad)
{
  if (pad != padChildren_) {
    padChildren_ = pad;

    layout();
  }
}

void LinearLayout::layout(Widget *caller)
{
  int width, height;
  std::tie(width, height) = Widget::baseLayout(caller);

  bool widthChanged = false, heightChanged = false;
  
  if (direction_ == DIR_VERTICAL) {
    int contentWidth = 0;

    if (width == 0) {
      // Clear realWidth_ to signal WRAP_CONTENT_FILL children to use WRAP_CONTENT
      realWidth_ = 0;
      // Determine content width
      if (children_.size() == 0)
	return;
      for(auto& ent : children_) {
	auto& child = *(std::get<1>(ent));
	assert(child.getHeight() != MATCH_PARENT);
	if (child.getWidth() == MATCH_PARENT)
	  continue;
	if ((child.getWidth() == WRAP_CONTENT) || (child.getWidth() == WRAP_CONTENT_FILL))
	  _layout(child);
	contentWidth = std::max(contentWidth, child.getRealWidth());
      }
      assert(contentWidth > 0);
      if (realWidth_ != contentWidth + padLeft_ + padRight_) {
	realWidth_ = contentWidth + padLeft_ + padRight_;
	widthChanged = true;
      }
      printf("Inner width: %d, outer width: %d\n", contentWidth, realWidth_);
    } else
      contentWidth = realWidth_ - padLeft_ - padRight_;      
    
    // Layout children
    int currentY = padTop_;
   
    for(auto& ent : children_) {
      auto& child = *(std::get<1>(ent));
      if (child.getWidth() == MATCH_PARENT)
	_layout(child);
      // Second layout pass for WRAP_CONTENT_FILL children
      if ((child.getWidth() == WRAP_CONTENT_FILL) &&
	  (child.getRealWidth() != contentWidth))
	_layout(child);
      
      SDL_Rect cr;
      cr.x = padLeft_;
      cr.y = currentY;
      if (contentWidth > child.getRealWidth()) {
	cr.w = child.getRealWidth();
	auto space = contentWidth - child.getRealWidth();
        if (child.getContainerAlignmentHoriz() == ALIGN_CENTER)
	  cr.x += space/2;
	else if (child.getContainerAlignmentHoriz() == ALIGN_RIGHT)
	  cr.x += space;
      } else
	cr.w = contentWidth;
      cr.h = child.getRealHeight();
      
      std::get<2>(ent) = cr;

      currentY += child.getRealHeight() + padChildren_;
    }

    if (height == 0)
      if (realHeight_ != currentY - padChildren_ + padBottom_) {
	realHeight_ = currentY - padChildren_ + padBottom_;
	heightChanged = true;
      }
  } else { // direction == DIR_HORIZONTAL
   int contentHeight = 0;

    if (height == 0) {
      // Clear realHeight_ to signal WRAP_CONTENT_FILL children to use WRAP_CONTENT
      realHeight_ = 0;
      // Determine content height
      if (children_.size() == 0)
	return;
      for(auto& ent : children_) {
	auto& child = *(std::get<1>(ent));
	assert(child.getWidth() != MATCH_PARENT);
	if (child.getHeight() == MATCH_PARENT)
	  continue;
	if ((child.getHeight() == WRAP_CONTENT) || (child.getHeight() == WRAP_CONTENT_FILL))
	  _layout(child);
	contentHeight = std::max(contentHeight, child.getRealHeight());
      }
      assert(contentHeight > 0);
      if (realHeight_ != contentHeight + padTop_ + padBottom_) {
	realHeight_ = contentHeight + padTop_ + padBottom_;
	heightChanged = true;
      }
      printf("Inner height: %d, outer height: %d\n", contentHeight, realHeight_);
    } else
      contentHeight = realHeight_ - padTop_ - padBottom_;
    
    // Layout children
    int currentX = padLeft_;  
    
    for(auto& ent : children_) {
      auto& child = *(std::get<1>(ent));
      if (child.getHeight() == MATCH_PARENT)
	_layout(child);
      // Second layout pass for WRAP_CONTENT_FILL children
      if ((child.getHeight() == WRAP_CONTENT_FILL) &&
	  (child.getRealHeight() != contentHeight))
	_layout(child);

      SDL_Rect cr;
      cr.x = currentX;
      cr.y = padTop_;
      cr.w = child.getRealWidth();
      if (contentHeight > child.getRealHeight()) {
	cr.h = child.getRealHeight();
	auto space = contentHeight - child.getRealHeight();
        if (child.getContainerAlignmentVert() == ALIGN_CENTER)
	  cr.y += space/2;
	else if (child.getContainerAlignmentVert() == ALIGN_BOTTOM)
	  cr.y += space;
      } else
	cr.h = contentHeight;
      
      std::get<2>(ent) = cr;
      
      currentX += child.getRealWidth() + padChildren_;
    }

    if (width == 0)
      if (realWidth_ != currentX - padChildren_ + padRight_) {
	realWidth_ = currentX - padChildren_ + padRight_;
	widthChanged = true;
      }
  }  

  if (parent_ && (parent_ != caller) &&
      ((widthChanged && ((parent_->getWidth() == WRAP_CONTENT) ||
			 (parent_->getWidth() == WRAP_CONTENT_FILL))) ||
       (heightChanged && ((parent_->getHeight() == WRAP_CONTENT) ||
			  (parent_->getHeight() == WRAP_CONTENT_FILL)))))
    _layout(*parent_);

  printf("Layout %s now %d, %d\n", name_.c_str(), realWidth_, realHeight_);
  
  invalidateGL();
}