Method onAction

Engine/source/gui/controls/guiPopUpCtrl.cpp:1220–1345

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//------------------------------------------------------------------------------
void GuiPopUpMenuCtrl::onAction()
{
   GuiControl *canCtrl = getParent();

   addChildren();

   GuiCanvas *root = getRoot();
   Point2I windowExt = root->getExtent();

   mBackground->resize( Point2I(0,0), root->getExtent() );
   
   S32 textWidth = 0, width = getWidth();
   const S32 textSpace = 2;
   bool setScroll = false;

   for ( U32 i = 0; i < mEntries.size(); ++i )
      if ( S32(mProfile->mFont->getStrWidth( mEntries[i].buf )) > textWidth )
         textWidth = mProfile->mFont->getStrWidth( mEntries[i].buf );

   S32 sbWidth = mSc->getControlProfile()->mBorderThickness * 2 + mSc->scrollBarThickness(); //  Calculate the scroll bar width
   if ( textWidth > ( getWidth() - sbWidth-mProfile->mTextOffset.x - mSc->getChildMargin().x * 2 ) ) //  The text draw area to test against is the width of the drop-down minus the scroll bar width, the text margin and the scroll bar child margins.
   {
      textWidth +=sbWidth + mProfile->mTextOffset.x + mSc->getChildMargin().x * 2; //  The new width is the width of the text plus the scroll bar width plus the text margin size plus the scroll bar child margins.
      width = textWidth;

      //  If a child margin is not defined for the scroll control, let's add
      //      some space between the text and scroll control for readability
      if(mSc->getChildMargin().x == 0)
         width += textSpace;
   }

   mTl->setCellSize(Point2I(width, mProfile->mFont->getHeight() + textSpace));

   for ( U32 j = 0; j < mEntries.size(); ++j )
      mTl->addEntry( mEntries[j].id, mEntries[j].buf );

   if ( mSelIndex >= 0 )
      mTl->setSelectedCell( Point2I( 0, mSelIndex ) );

   Point2I pointInGC = canCtrl->localToGlobalCoord( getPosition() );
   Point2I scrollPoint( pointInGC.x, pointInGC.y + getHeight() ); 

   //Calc max Y distance, so Scroll Ctrl will fit on window 

   S32 sbBorder = mSc->getControlProfile()->mBorderThickness * 2 + mSc->getChildMargin().y * 2;
   S32 maxYdis = windowExt.y - pointInGC.y - getHeight() - sbBorder;

   //If scroll bars need to be added
   mRevNum = 0;
   if ( maxYdis < mTl->getHeight() + sbBorder )
   {
      //Should we pop menu list above the button
      if ( maxYdis < pointInGC.y )
      {
         if(mReverseTextList)
            reverseTextList();

         maxYdis = pointInGC.y;