/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:   

*

*/

#include <../bidi.h>

#include <AknUtils.h>

#include <e32cmn.h>

#include "WebScrollbarDrawer.h"

#include "WebView.h"

#include "WebFrame.h"

#include "WebFrameView.h"

#include "BrCtl.h"

#include "StaticObjectsContainer.h"

#include "WebSurface.h"

#include "WebSprite.h"

#include "WebKitLogger.h"

const int     KMinScrollbarWidth = 10;

const int     KMaxScrollbarWidth = 15;

const TUint32 KMinScrollBarTransparency = 150;

const int     KScrollBarFadeInterval = 30000;

const TInt32  KScrollBarTransparencyStep = 10;

const int     KMinThumbSize = 30;

int handleFadeScrollBar(TAny* ptr);

using namespace WebCore;

WebScrollbarDrawer* WebScrollbarDrawer::NewL()

{

  WebScrollbarDrawer* self = new(ELeave) WebScrollbarDrawer();

  CleanupStack::PushL(self);

  self->ConstructL();

  CleanupStack::Pop(); //self

  return self;

}

void WebScrollbarDrawer::ConstructL()

{

  m_scrollBarFader = CPeriodic::NewL(CActive::EPriorityStandard);

}

WebScrollbarDrawer::WebScrollbarDrawer(): 

                                        m_webView(NULL),

                                        m_scrollBarTransparency(KMinScrollBarTransparency),

                                        m_scrollBarWidth(KMinScrollbarWidth),

                                        m_dX(0), m_dY(0), m_spriteV(NULL), m_spriteH(NULL)

{

}

WebScrollbarDrawer::~WebScrollbarDrawer()

{

  if (m_scrollBarFader) {

      m_scrollBarFader->Cancel();

  }

  delete m_scrollBarFader;

  removeBitmaps();

  delete m_spriteV;

  delete m_spriteH;

}

void WebScrollbarDrawer::removeBitmaps()

{

  deleteBitmap(m_scrollBarV, m_gcV, m_devV);

  deleteBitmap(m_scrollBarVMask, m_gcVMask, m_devVMask);

  deleteBitmap(m_scrollBarH, m_gcH, m_devH);

  deleteBitmap(m_scrollBarHMask, m_gcHMask, m_devHMask);

}

TInt WebScrollbarDrawer::InitScrollbar(WebView* view)

{

  TInt err = KErrNone;

  m_hasVScroll = EFalse;

  m_hasHScroll = EFalse;

  m_webView = view;  

  m_scrollBarTransparency = KMinScrollBarTransparency;

  m_dY = 0.0;

  m_dX = 0.0;

  m_rectVThum = TRect();

  m_rectHThum = TRect();

  m_rect.SetRect(m_webView->brCtl()->Rect().iTl,

                 m_webView->brCtl()->Rect().Size());

  m_scrollBarWidth = Max(0.04 * Min(m_rect.Width(), m_rect.Height()), KMinScrollbarWidth);  

  calculateBitmapRects();

  err = SetupBitmaps();

  if (err == KErrNone) {

      if (!m_spriteV) {

          m_spriteV = CWebSprite::NewL(m_webView, m_rectVThum.iTl, m_scrollBarV, m_scrollBarVMask, ETrue);

      }

      else {

          m_spriteV->SetBitmap(m_scrollBarV, m_scrollBarVMask, ETrue);

          m_spriteV->SetPos(m_rectVThum.iTl);

      }

      if (!m_spriteH) {

          m_spriteH = CWebSprite::NewL(m_webView, m_rectHThum.iTl, m_scrollBarH, m_scrollBarHMask, ETrue);

      }

      else {    

          m_spriteH->SetBitmap(m_scrollBarH, m_scrollBarHMask, ETrue);

          m_spriteH->SetPos(m_rectHThum.iTl);

      }

      m_spriteV->Hide();

      m_spriteH->Hide();

  }

  return err;

}

int WebScrollbarDrawer::fadeTime()

{

    return KScrollBarFadeInterval;

}

void WebScrollbarDrawer::fadeScrollbar()

{

    fadeScrollbar(0);

}

void WebScrollbarDrawer::fadeScrollbar(TInt delay)

{

  if (m_hasVScroll || m_hasHScroll) {

    if (!m_scrollBarFader->IsActive()) {

      m_scrollBarFader->Start(delay, KScrollBarFadeInterval, 

                              TCallBack(&handleFadeScrollBar, this));

    }

  }

  else {

    m_scrollBarTransparency = 255;

    fade();

  }

}

int handleFadeScrollBar(TAny* ptr)

{

  (static_cast<WebScrollbarDrawer*>(ptr))->fade();	

  return EFalse;

}

void WebScrollbarDrawer::clearSprites()

{

   if (m_spriteV) {

       m_spriteV->Hide();

       m_spriteV->Update(NULL, NULL);

   }

   if (m_spriteH) {

       m_spriteH->Hide();

       m_spriteH->Update(NULL, NULL);

   }

}

void WebScrollbarDrawer::fade()

{

  m_scrollBarTransparency += KScrollBarTransparencyStep;

  if (m_scrollBarTransparency >= 255) {

    m_scrollBarFader->Cancel();

    clearSprites();

    removeBitmaps();

    if (m_webView) {

      m_webView->syncRepaint(m_webView->mainFrame()->frameView()->visibleRect());

      m_webView = NULL;

    }

    m_hasVScroll = EFalse;

    m_hasHScroll = EFalse;

  }

  else {

    if (m_hasVScroll) {

      drawThumbMask(m_gcVMask, m_rectVThum);

      if (m_spriteV) {

          m_spriteV->Update(m_scrollBarV, m_scrollBarVMask);

      }

    }

    if (m_hasHScroll) {

      drawThumbMask(m_gcHMask, m_rectHThum);

      if (m_spriteH) {

          m_spriteH->Update(m_scrollBarH, m_scrollBarHMask);

      }

    }

  }

}

TBool WebScrollbarDrawer::canRedraw()

{

    return ((m_webView && m_spriteV && m_spriteH) && 

            (m_spriteV->IsShown() || m_spriteH->IsShown()));    

}

void WebScrollbarDrawer::redrawScrollbar()

{

    if (canRedraw()) {

        clearSprites();

        removeBitmaps();

        InitScrollbar(m_webView);

    }

}

void WebScrollbarDrawer::drawScrollbar(WebView* view)

{

    TPoint p = TPoint(1,1);

    drawScrollbar(view, p);

}

void WebScrollbarDrawer::drawScrollbar(WebView* view, TPoint& scrollPos) 

{

  if (!(view->brCtl()->capabilities() & TBrCtlDefs::ECapabilityDisplayScrollBar)) {

    return;  

  }

  if (m_scrollBarFader->IsActive()) {

    m_scrollBarFader->Cancel();

    clearSprites();

    removeBitmaps();

    m_hasVScroll = EFalse;

    m_hasHScroll = EFalse;

    m_webView = NULL;

  }

  if (!m_webView) {

    InitScrollbar(view);

  }

  /*

   * According to spec vertical scrollbar is always visible

   * even if user is not scrolling in vertical direction

   * Horizontal scrollbar is shown only if user scroll in 

   * horizontal direction. If content height < screen height

   * vertical scrollbar is not shown. The same for horizontal one.  

   */

  if (!m_hasHScroll) { //set it only once

    m_hasHScroll = (Abs(scrollPos.iX) > 1) && (m_displayWidth < m_docWidth);

    if (m_hasHScroll) {

        m_spriteH->Update(m_rectHThum.iTl, m_scrollBarH, m_scrollBarHMask);

    }

  }

  if (!m_hasVScroll) {  //set it only once

    m_hasVScroll = ( (Abs(scrollPos.iY) > 1) || (Abs(scrollPos.iX) > 1) ) && 

                     (m_displayHeight < m_docHeight);

    if (m_hasVScroll) {

        m_spriteV->Update(m_rectVThum.iTl, m_scrollBarV, m_scrollBarVMask);

    }

  }

  if (m_hasVScroll) {

    m_dY += m_zoomFactor * ((float)scrollPos.iY * (float)m_displayHeight ) / (float)m_docHeight / 100;

    if (m_rectVThum.iTl.iY + m_dY < m_rectV.iTl.iY) {

        m_dY = m_rectV.iTl.iY - m_rectVThum.iTl.iY; 

    }

    else if (m_rectVThum.iBr.iY + m_dY > m_rectV.iBr.iY) {

        m_dY = m_rectV.iBr.iY - m_rectVThum.iBr.iY;

    }

    else if ((m_rectVThum.iTl.iY + m_dY == m_rectV.iTl.iY) ||

            (m_rectVThum.iBr.iY + m_dY == m_rectV.iBr.iY)) {

        m_dY = 0.0;        

    }

    if (Abs(m_dY) > 1) { 

      m_rectVThum.Move(0, m_dY);

      m_dY = 0.0;

    }

    m_spriteV->SetPos(m_rectVThum.iTl);

    //m_spriteV->Update(m_rectVThum.iTl, m_scrollBarV, m_scrollBarVMask);

  }

  if (m_hasHScroll) {

    m_dX = m_zoomFactor * ((float)scrollPos.iX * (float)m_displayWidth ) / (float)m_docWidth / 100;

    if (m_rectHThum.iTl.iX + m_dX < m_rectH.iTl.iX) {

        m_dX = m_rectH.iTl.iX - m_rectHThum.iTl.iX; 

    }

    else if (m_rectHThum.iBr.iX + m_dX > m_rectH.iBr.iX) {

        m_dX = m_rectH.iBr.iX - m_rectHThum.iBr.iX;

    }

    else if ((m_rectHThum.iTl.iX + m_dX == m_rectH.iTl.iX) ||

             (m_rectHThum.iBr.iX + m_dX == m_rectH.iBr.iX)) {

        m_dX = 0.0;         

    }

    if (Abs(m_dX) > 1) {

      m_rectHThum.Move(m_dX, 0);

    }

    m_spriteH->SetPos(m_rectHThum.iTl);

    //m_spriteH->Update(m_rectHThum.iTl, m_scrollBarH, m_scrollBarHMask);

  }  

}

TInt WebScrollbarDrawer::createBitmap(CFbsBitmap*& bm, CFbsBitGc*& gc, 

		                               CFbsBitmapDevice*& dev, TRect& rect)

{

  TInt err = KErrNone;

  bm = new CFbsBitmap();

  if (!bm) {

      err = KErrNoMemory;

  }

  if (err == KErrNone) {

      err = bm->Create(rect.Size(), EColor256);      

  }

  if (err == KErrNone) {

      TRAP(err, dev = CFbsBitmapDevice::NewL(bm));

  }

  if (err == KErrNone && dev != NULL) {

      err = dev->CreateContext(gc);

  }

  if (err != KErrNone) {

      delete dev;

  }

  return err;

}

void WebScrollbarDrawer::deleteBitmap(CFbsBitmap*& bm, CFbsBitGc*& gc, 

		                               CFbsBitmapDevice*& dev)

{

  if (bm) {

    delete bm;

    bm = NULL;

  }

  if (gc) {

    delete gc;

    gc = NULL;

  }

  if (dev) {

    delete dev;

    dev = NULL;

  }

}

TInt WebScrollbarDrawer::SetupBitmaps()

{

  // if rect is empty don't create bitmap

  TInt err = (m_rectVThum != TRect(0,0,0,0)) ? KErrNone : KErrNotReady;

  if (!m_scrollBarV && err == KErrNone) {

    err = createBitmap(m_scrollBarV, m_gcV, m_devV, m_rectVThum);

  }

  if (!m_scrollBarVMask && err == KErrNone) {

    err = createBitmap(m_scrollBarVMask, m_gcVMask, m_devVMask, m_rectVThum);

  }

  if (err == KErrNone) {

      drawThumb(m_gcV, m_rectVThum);

      drawThumbMask(m_gcVMask, m_rectVThum);

  }

  // if rect is empty don't create bitmap

  if (err == KErrNotReady || KErrNone) {

      err = (m_rectHThum != TRect(0,0,0,0)) ? KErrNone : KErrNotReady;

  }

  if (!m_scrollBarH && err == KErrNone) {

    err = createBitmap(m_scrollBarH, m_gcH, m_devH, m_rectHThum);

  }

  if (!m_scrollBarHMask && err == KErrNone) {

    err = createBitmap(m_scrollBarHMask, m_gcHMask, m_devHMask, m_rectHThum);

  }

  if (err == KErrNone) {

      drawThumb(m_gcH, m_rectHThum);

      drawThumbMask(m_gcHMask, m_rectHThum);

  }

  if (err == KErrNotReady) {

      err = KErrNone;

  }

  return err;

}

void WebScrollbarDrawer::calculateBitmapRects()

{

  m_zoomFactor =  ((float)m_webView->scalingFactor() / 100);

  int delta = 0;

  int posX = m_zoomFactor * m_webView->mainFrame()->frameView()->contentPos().iX;

  int posY = m_zoomFactor * m_webView->mainFrame()->frameView()->contentPos().iY;

  m_docWidth = m_zoomFactor * m_webView->mainFrame()->frameView()->contentSize().iWidth;

  m_displayWidth = m_rect.Width();

  m_docHeight = m_zoomFactor * m_webView->mainFrame()->frameView()->contentSize().iHeight;

  m_displayHeight = m_rect.Height();

  m_docHeight = (m_displayHeight > m_docHeight) ? m_displayHeight : m_docHeight;

  m_docWidth = (m_displayWidth > m_docWidth) ? m_displayWidth : m_docWidth;

  bool shouldHaveHScroll = (m_displayWidth < m_docWidth); 

  bool shouldHaveVScroll = (m_displayHeight < m_docHeight);

  TPoint vThumbTl;

  TPoint hThumbTl;

  if (AknLayoutUtils::LayoutMirrored()) {

    if (shouldHaveHScroll) { //horizontal scroll bar

      delta = shouldHaveVScroll ? m_scrollBarWidth : 0; //to ajust thumb and scrollbar rect

      m_rectH.SetRect(0 + delta, m_rect.Height() - m_scrollBarWidth, m_rect.Width(), m_rect.Height());

      hThumbTl.SetXY(m_scrollBarWidth + (posX * m_rectH.Width()) / m_docWidth, 

	                 m_rect.Height() - m_scrollBarWidth);

    }

    if (shouldHaveVScroll) {

      delta = shouldHaveHScroll ? m_scrollBarWidth : 0; //to ajust thumb and scrollbar rect

      m_rectV.SetRect(0, 0, m_scrollBarWidth, m_rect.Height() - delta);

      vThumbTl.SetXY(0, (posY * m_rectV.Height()) / m_docHeight);

    }

  }

  else {

    if (shouldHaveHScroll) {

      delta = shouldHaveVScroll ? m_scrollBarWidth : 0; //to ajust thumb and scrollbar rect

      m_rectH.SetRect(0, m_rect.Height() - m_scrollBarWidth, 

                    m_rect.Width() - delta, m_rect.Height());

      hThumbTl.SetXY((posX * m_rectH.Width()) / m_docWidth, 

                     m_rect.Height() - m_scrollBarWidth);

    }   

    if (shouldHaveVScroll) {

      delta = shouldHaveHScroll ? m_scrollBarWidth : 0; //to ajust thumb and scrollbar rect

      m_rectV.SetRect(m_rect.Width() - m_scrollBarWidth, 0, 

   		              m_rect.Width(), m_rect.Height() - delta);

      vThumbTl.SetXY(m_rect.Width() - m_scrollBarWidth, 

                     ((posY * m_rectV.Height()) / m_docHeight));

    }

  }

  if (shouldHaveHScroll) {

    int thW = ((float)m_rectH.Width() * m_displayWidth) / m_docWidth;

    thW = (thW < KMinThumbSize) ? KMinThumbSize : thW;

    m_rectHThum.SetRect(hThumbTl, TSize(thW, m_scrollBarWidth));       

    if (m_rectHThum.iBr.iX > m_rectH.iBr.iX) {

      m_rectHThum.Move(m_rectH.iBr.iX - m_rectHThum.iBr.iX, 0);

    }

  }

  if (shouldHaveVScroll) {

    int thH = ((float)m_rectV.Height() * m_displayHeight) / m_docHeight;

    thH = (thH < KMinThumbSize) ? KMinThumbSize : thH;

    m_rectVThum.SetRect(vThumbTl, TSize(m_scrollBarWidth, thH));

    if (m_rectVThum.iBr.iY > m_rectV.iBr.iY) {

      m_rectVThum.Move(0, m_rectV.iBr.iY - m_rectVThum.iBr.iY);

    }

  }

}

void WebScrollbarDrawer::drawThumb(CBitmapContext* gc, TRect& rect)

{

  TRect r(TPoint(0, 0), rect.Size());

  gc->SetBrushStyle(CGraphicsContext::ESolidBrush);

  gc->SetPenStyle(CGraphicsContext::ESolidPen);

  gc->SetPenSize(TSize(2,2));

  gc->SetPenColor(TRgb(242, 242, 242));

  gc->SetBrushColor(TRgb(10, 10, 10));

  gc->DrawRoundRect(r, TSize(7, 7));

}

void WebScrollbarDrawer::drawThumbMask(CBitmapContext* gc, TRect& rect)

{

  TRect r(TPoint(0, 0), rect.Size());

  TRgb  penMaskColor = TRgb(m_scrollBarTransparency, m_scrollBarTransparency, m_scrollBarTransparency);

  TRgb  brushMaskColor = TRgb(m_scrollBarTransparency, m_scrollBarTransparency, m_scrollBarTransparency);;

  gc->SetBrushStyle(CGraphicsContext::ESolidBrush);

  gc->SetPenStyle(CGraphicsContext::ESolidPen);

  gc->SetBrushColor(brushMaskColor);

  gc->SetPenSize(TSize(2,2));

  gc->SetPenColor(TRgb(5, 5, 5));

  gc->DrawRoundRect(r, TSize(7, 7));

}