Method OnDraw

ui/UIListBox.cpp:620–710

behavior when gadget is being drawn.

// behavior when gadget is being drawn.
void UIListBox::OnDraw() {
  bool use_scroll = !(m_Flags & UILB_NOSCROLL);
  bool auto_select = ((m_Flags & UILB_AUTOSELECT) > 0);
  UITextItem uarrow;
  UITextItem darrow;
  char arrowbuf[2];

  if (m_Flags & UIF_BORDER)
    ui_DrawBox(GR_WHITE, 0, 0, m_W, m_H);

  ui_SetTextClip(m_CX, m_CY, m_CX2, m_CY2);

  //	draw all items in box that can be visible.
  int x, y, i;
  uint8_t alpha;

  x = m_TextOffX;
  y = m_TextOffY;

  if (m_NumItems) {
    snprintf(arrowbuf, sizeof(arrowbuf), "%c", UI_UP_ARROW_CHAR);
    uarrow = UITextItem(arrowbuf, m_ItemList[m_Index]->get_color(), 255);
    snprintf(arrowbuf, sizeof(arrowbuf), "%c", UI_DOWN_ARROW_CHAR);
    darrow = UITextItem(arrowbuf, m_ItemList[m_Index]->get_color(), 255);

    // reset these
    m_ShowUp = m_ShowDown = false;

    if (use_scroll) {
      m_UpArrowY0 = y;
      m_UpArrowY1 = y + uarrow.height();
      if (m_Index > 0)
        uarrow.draw(m_TextOffX, m_UpArrowY0, IsDisabled() ? uiDrawFaded : uiDrawNormal);
      m_ShowUp = true;
      m_ArrowWidth = uarrow.width() + 2;
      x = x + m_ArrowWidth;
    } else
      m_ArrowWidth = 0;
  }

  alpha = m_Alpha;

  for (i = m_Index; i < m_NumItems; i++) {
    // check to see if scroll arrow down needs to be drawn.
    //		if (m_SelectedIndex == i) {
    //			ui_DrawSetAlpha((alpha/4)+1);
    //			ui_DrawRect(m_HiliteColor, x,y,m_W-m_TextOffX,y+m_ItemList[i]->height()+2);
    //		}

    m_ItemList[i]->set_alpha((uint8_t)alpha);
    if (m_SelectedIndex == i) {
      ddgr_color old_color = m_ItemList[i]->get_color();
      m_ItemList[i]->set_color(m_SelectColor);
      m_ItemList[i]->draw(x + 1, y + 1, IsDisabled() ? uiDrawFaded : uiDrawNormal);
      if (!IsDisabled())
        m_ItemList[i]->draw(x + 1, y + 1, uiDrawAlphaSaturate);
      m_ItemList[i]->set_color(old_color);
    } else {