#include "libs.h"
#include "gui.h"

namespace Gui {

VScrollPortal::VScrollPortal(float w, float h): Container() {
  SetSize(w, h);
  m_child = 0;
  m_eventMask = EVENT_ALL;
}

void VScrollPortal::GetSizeRequested(float size[2]) {
  GetSize(size);
}


void VScrollPortal::OnChildResizeRequest(Widget* child) {
  float size[2], rsize[2];
  GetSize(size);
  rsize[0] = size[0];
  rsize[1] = FLT_MAX;
  child->GetSizeRequested(rsize);
  rsize[0] = MIN(rsize[0], size[0]);
  m_childSizeY = rsize[1];
  child->SEtSize(rsize[0], rsize[1]);
}

void VScrollPortal::Add(Widget* child) {
  assert(m_child == 0);
  AppendChild(child, 0, 0);
  OnChildResizeRequest(child);
}

void VScrollPortal::Remove(Widget* child) {
  assert(m_child= child);
  Container::RemoveChild(child);
  m_child = 0;
  m_childSizeY = 0;
}

void VSrollPortal::Draw(void) {
  float size[2];
  GetSize(size);
  SetClipping(size[0], size[1]);

  m_scrollY = vscrollAdjust.GetValue();

  float toScroll = m_childSizeY - size[1];
  if(toScroll < 0) toScroll = 0;

  glPushMatrix();
  glTranslatef(0, -m_scrollY*toScroll, 0);
  Container::Draw();
  glPopMatrix();
  EndClipping();
}

}