#include "xosd.h"

#include <qpainter.h>
#include <qbitmap.h>
#include <qstring.h>
#include <qfont.h>
#include <qfontmetrics.h>

#include <qwidget.h>
#include <klocale.h>
#include <netwm.h>
#include <netwm_def.h>
#include <kwin.h>

#include <kdebug.h>

xosd::xosd(QWidget *parent, const char *name) : QWidget(parent, name, WStyle_Customize |  WRepaintNoErase | WStyle_NoBorder | WDestructiveClose | WResizeNoErase | WMouseNoMask | WStyle_StaysOnTop | WX11BypassWM)
{
  info = new NETWinInfo( qt_xdisplay(), winId(), qt_xrootwin(), NET::WMState);
  info->setDesktop( NETWinInfo::OnAllDesktops );
  hide();
  KWin::setState(winId(), NET::SkipTaskbar | NET::SkipPager);
  setCaption("kooldock xosd window");
}

xosd::~xosd()
{
}

void xosd::setColor(QString color)
{
  fontColor=color;
}

void xosd::setShadowColor(QString color)
{
  shadowColor=color;
}

void xosd::setOrientation(int orientation, int w, int mh)
{
  fOrientation=orientation;
  dw=w;
  rdh=mh;
  if (fCleaner==1)
  {
  //font is set, so program can get its height to prepare background buffer
    QFontMetrics *metrics = new QFontMetrics(f);
    h = metrics->height();
  
    bgBuffer = QPixmap(dw, h);
    maskBuffer = QPixmap(dw, h, true);
    bgBuffer = QPixmap::grabWindow(qt_xrootwin(), 0, 0, dw, h);
    lastX=0;
    lastY=0;
  }
  
}

//Enables/disables dynamic background
void xosd::setClear(int nClean)
{
  fCleaner = nClean;
}

void xosd::setShadowOffset(int off)
{
  shadowOffset=off;
}

void xosd::setText(QString t)
{
   //setMask(QRegion(0,0,0,0));
   // NOTICE: it appears that with WX11BypassWM, resize() doesn't flick the widget anymore :)
   // so, setMask() is no more needed.
   // -- Matias
  resize(0,0);
  text = t;
  QFontMetrics *metrics = new QFontMetrics(f);
  w = metrics->width(text);
  w = w + shadowOffset + 5; // 5 pixels more
  h = metrics->height();
  yOffset = metrics->height()-metrics->descent();
  update();
}

void xosd::setFont(QString font)
{
  f.setFamily(font);
}

void xosd::setItalic()
{
  f.setItalic(TRUE);
}

void xosd::setBold()
{
  f.setBold(TRUE);
}

void xosd::setSize(int size)
{
  f.setPointSize(size);
  fontSize = size;
}

/*int xosd::w()
{
  QFontMetrics *metrics = new QFontMetrics(f);
  return (metrics->width(text) + shadowOffset + 5);

}

int xosd::h()
{
  QFontMetrics *metrics = new QFontMetrics(f);
  return metrics->height();
}*/

void xosd::paintEvent(QPaintEvent *)
{
  int i, j;

  resize(w,h);
	
  QPixmap pm(size());
  QBitmap bm(size());
  QPainter p;
  
  //Drawing text
  p.begin(&pm, this);
  if (fCleaner==1)
  {
    //Dynamic background - look cleaner
    bitBlt(&pm, 0, 0, &bgBuffer, lastX, 0, w, h);
  }
  else
  {
    //One colour background - work faster
    p.fillRect (rect(), QColor(shadowColor));
  }
   
  p.setPen( QColor(shadowColor) );
  p.setFont(f);
  p.drawText(shadowOffset, yOffset + shadowOffset, text, AlignCenter);	// draw shadow text
  
   // now, draw normal text
  p.setPen( QColor(fontColor) );
   
  p.drawText(1, yOffset, text, AlignCenter);	// draw front text
	
  p.end();
  
  //Drawing mask
  p.begin(&bm, this);
   // now we must draw the text with black color for making the mask
  p.setPen( Qt::white );
  p.fillRect (rect(), Qt::black);
  p.setFont(f);
  for (i=-fCleaner;i<=fCleaner;i++)
  {
    for (j=-fCleaner;j<=fCleaner;j++)
    {
      p.drawText(shadowOffset+i, yOffset + shadowOffset+j, text, AlignCenter);	// shadow
      p.drawText(1+i, yOffset+j, text, AlignCenter);	// front
    }
  }
  p.end();
  bitBlt(this, 0, 0, &pm);	// update the widget
  if (fCleaner==1) bitBlt(&maskBuffer, 0, 0, &bm);
  
  info->setState(NETWinInfo::SkipTaskbar | NETWinInfo::SkipPager, NETWinInfo::SkipTaskbar | NETWinInfo::SkipPager);
  setMask(bm);
}

void xosd::move2(int x, int y)
{

  //bit block transfer don't work propertly with too less cursor position changes
  if (abs(lastY-y)>2 || abs(lastX-x)>2)
  {
    if (fCleaner==1) 
    {
      QPixmap tmpBuffer;
      //window is not hidden
      if (y!=rdh)
      {
        tmpBuffer = QPixmap::grabWindow(qt_xrootwin(), 0, y, dw, h);
        if (lastY!=rdh)
        {
        //fill background covered with the text with cached version
          if (fOrientation==0 ) //horizontal
          {
            bitBlt(&tmpBuffer, lastX, 0, &maskBuffer, 0, 0, w, h, Qt::AndROP);//copying part, which hides only the text
            bitBlt(&bgBuffer, lastX, 0, &maskBuffer, 0, 0, w, h, Qt::NotAndROP);//so the background won't be covered by
            bitBlt(&tmpBuffer, lastX, 0, &bgBuffer, lastX, 0, w, h, Qt::OrROP);//currently visible text.
          }
          if (fOrientation==1) //vertical
          {
            if (y<lastY && (y+h)>lastY)
            {
              bitBlt(&tmpBuffer, lastX, lastY-y, &maskBuffer, 0, 0, w, h, Qt::AndROP);
              bitBlt(&bgBuffer, lastX, 0, &maskBuffer, 0, 0, w, h, Qt::NotAndROP);
              bitBlt(&tmpBuffer, lastX, lastY-y, &bgBuffer, lastX, 0, w, h, Qt::OrROP);
            }
            if (y>lastY && (y-lastY)<h)
            {
              bitBlt(&tmpBuffer, lastX, 0, &maskBuffer, 0, 0, w, h, Qt::AndROP);
              bitBlt(&bgBuffer, lastX, y-lastY, &maskBuffer, 0, 0, w, h, Qt::NotAndROP);
              bitBlt(&tmpBuffer, lastX, 0, &bgBuffer, lastX, y-lastY, w, h, Qt::OrROP);
            }
          }
        }
    
      }
      bitBlt(&bgBuffer,0,0,&tmpBuffer);
      lastX=x;
      paintEvent(NULL);
    }
    
    move(x,y);
    lastX=x;
    lastY=y;
  }
}