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qgscomposerhtml.cpp
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qgscomposerhtml.cpp
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/***************************************************************************
qgscomposerhtml.cpp
------------------------------------------------------------
begin : July 2012
copyright : (C) 2012 by Marco Hugentobler
email : marco dot hugentobler at sourcepole dot ch
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgscomposerhtml.h"
#include "qgscomposerframe.h"
#include "qgscomposition.h"
#include "qgsaddremovemultiframecommand.h"
#include <QCoreApplication>
#include <QPainter>
#include <QWebFrame>
#include <QWebPage>
#include <QImage>
QgsComposerHtml::QgsComposerHtml( QgsComposition* c, bool createUndoCommands ): QgsComposerMultiFrame( c, createUndoCommands ),
mWebPage( 0 ),
mLoaded( false ),
mHtmlUnitsToMM( 1.0 ),
mRenderedPage( 0 ),
mUseSmartBreaks( true )
{
mHtmlUnitsToMM = htmlUnitsToMM();
mWebPage = new QWebPage();
QObject::connect( mWebPage, SIGNAL( loadFinished( bool ) ), this, SLOT( frameLoaded( bool ) ) );
if ( mComposition )
{
QObject::connect( mComposition, SIGNAL( itemRemoved( QgsComposerItem* ) ), this, SLOT( handleFrameRemoval( QgsComposerItem* ) ) );
}
}
QgsComposerHtml::QgsComposerHtml(): QgsComposerMultiFrame( 0, false ),
mWebPage( 0 ),
mLoaded( false ),
mHtmlUnitsToMM( 1.0 ),
mRenderedPage( 0 ),
mUseSmartBreaks( true )
{
}
QgsComposerHtml::~QgsComposerHtml()
{
delete mWebPage;
delete mRenderedPage;
}
void QgsComposerHtml::setUrl( const QUrl& url )
{
if ( !mWebPage )
{
return;
}
mLoaded = false;
mUrl = url;
mWebPage->mainFrame()->load( mUrl );
while ( !mLoaded )
{
qApp->processEvents();
}
if ( frameCount() < 1 ) return;
QSize contentsSize = mWebPage->mainFrame()->contentsSize();
contentsSize.setWidth( mFrameItems.at( 0 )->boundingRect().width() * mHtmlUnitsToMM );
mWebPage->setViewportSize( contentsSize );
mWebPage->mainFrame()->setScrollBarPolicy( Qt::Horizontal, Qt::ScrollBarAlwaysOff );
mWebPage->mainFrame()->setScrollBarPolicy( Qt::Vertical, Qt::ScrollBarAlwaysOff );
mSize.setWidth( contentsSize.width() / mHtmlUnitsToMM );
mSize.setHeight( contentsSize.height() / mHtmlUnitsToMM );
renderCachedImage();
recalculateFrameSizes();
emit changed();
}
void QgsComposerHtml::frameLoaded( bool ok )
{
Q_UNUSED( ok );
mLoaded = true;
}
void QgsComposerHtml::renderCachedImage()
{
//render page to cache image
if ( mRenderedPage )
{
delete mRenderedPage;
}
mRenderedPage = new QImage( mWebPage->viewportSize(), QImage::Format_ARGB32 );
QPainter painter;
painter.begin( mRenderedPage );
mWebPage->mainFrame()->render( &painter );
painter.end();
}
QSizeF QgsComposerHtml::totalSize() const
{
return mSize;
}
void QgsComposerHtml::render( QPainter* p, const QRectF& renderExtent )
{
if ( !mWebPage )
{
return;
}
p->save();
p->scale( 1.0 / mHtmlUnitsToMM, 1.0 / mHtmlUnitsToMM );
p->translate( 0.0, -renderExtent.top() * mHtmlUnitsToMM );
mWebPage->mainFrame()->render( p, QRegion( renderExtent.left(), renderExtent.top() * mHtmlUnitsToMM, renderExtent.width() * mHtmlUnitsToMM, renderExtent.height() * mHtmlUnitsToMM ) );
p->restore();
}
double QgsComposerHtml::htmlUnitsToMM()
{
if ( !mComposition )
{
return 1.0;
}
return ( mComposition->printResolution() / 72.0 ); //webkit seems to assume a standard dpi of 96
}
void QgsComposerHtml::addFrame( QgsComposerFrame* frame, bool recalcFrameSizes )
{
mFrameItems.push_back( frame );
QObject::connect( frame, SIGNAL( sizeChanged() ), this, SLOT( recalculateFrameSizes() ) );
if ( mComposition )
{
mComposition->addComposerHtmlFrame( this, frame );
}
if ( recalcFrameSizes )
{
recalculateFrameSizes();
}
}
bool candidateSort( const QPair<int, int> &c1, const QPair<int, int> &c2 )
{
if ( c1.second < c2.second )
return true;
else if ( c1.second > c2.second )
return false;
else if ( c1.first > c2.first )
return true;
else
return false;
}
double QgsComposerHtml::findNearbyPageBreak( double yPos )
{
if ( !mWebPage || !mRenderedPage || !mUseSmartBreaks )
{
return yPos;
}
//convert yPos to pixels
int idealPos = yPos * htmlUnitsToMM();
//if ideal break pos is past end of page, there's nothing we need to do
if ( idealPos >= mRenderedPage->height() )
{
return yPos;
}
int maxSearchDistance = 200;
//loop through all lines just before ideal break location, up to max distance
//of maxSearchDistance
int changes = 0;
QRgb currentColor;
QRgb pixelColor;
QList< QPair<int, int> > candidates;
int minRow = qMax( idealPos - maxSearchDistance, 0 );
for ( int candidateRow = idealPos; candidateRow >= minRow; --candidateRow )
{
changes = 0;
currentColor = qRgba( 0, 0, 0, 0 );
//check all pixels in this line
for ( int col = 0; col < mRenderedPage->width(); ++col )
{
//count how many times the pixels change color in this row
//eventually, we select a row to break at with the minimum number of color changes
//since this is likely a line break, or gap between table cells, etc
//but very unlikely to be midway through a text line or picture
pixelColor = mRenderedPage->pixel( col, candidateRow );
if ( pixelColor != currentColor )
{
//color has changed
currentColor = pixelColor;
changes++;
}
}
candidates.append( qMakePair( candidateRow, changes ) );
}
//sort candidate rows by number of changes ascending, row number descending
qSort( candidates.begin(), candidates.end(), candidateSort );
//first candidate is now the largest row with smallest number of changes
//ok, now take the mid point of the best candidate position
//we do this so that the spacing between text lines is likely to be split in half
//otherwise the html will be broken immediately above a line of text, which
//looks a little messy
int maxCandidateRow = candidates[0].first;
int minCandidateRow = maxCandidateRow + 1;
int minCandidateChanges = candidates[0].second;
QList< QPair<int, int> >::iterator it;
for ( it = candidates.begin(); it != candidates.end(); ++it )
{
if (( *it ).second != minCandidateChanges || ( *it ).first != minCandidateRow - 1 )
{
//no longer in a consecutive block of rows of minimum pixel colour changes
//so return the row mid-way through the block
//first converting back to mm
return ( minCandidateRow + ( maxCandidateRow - minCandidateRow ) / 2 ) / htmlUnitsToMM();
}
minCandidateRow = ( *it ).first;
}
//above loop didn't work for some reason
//return first candidate converted to mm
return candidates[0].first / htmlUnitsToMM();
}
void QgsComposerHtml::setUseSmartBreaks( bool useSmartBreaks )
{
mUseSmartBreaks = useSmartBreaks;
recalculateFrameSizes();
}
bool QgsComposerHtml::writeXML( QDomElement& elem, QDomDocument & doc, bool ignoreFrames ) const
{
QDomElement htmlElem = doc.createElement( "ComposerHtml" );
htmlElem.setAttribute( "url", mUrl.toString() );
htmlElem.setAttribute( "useSmartBreaks", mUseSmartBreaks ? "true" : "false" );
bool state = _writeXML( htmlElem, doc, ignoreFrames );
elem.appendChild( htmlElem );
return state;
}
bool QgsComposerHtml::readXML( const QDomElement& itemElem, const QDomDocument& doc, bool ignoreFrames )
{
deleteFrames();
//first create the frames
if ( !_readXML( itemElem, doc, ignoreFrames ) )
{
return false;
}
mUseSmartBreaks = itemElem.attribute( "useSmartBreaks", "true" ) == "true" ? true : false;
//finally load the set url
QString urlString = itemElem.attribute( "url" );
if ( !urlString.isEmpty() )
{
setUrl( QUrl( urlString ) );
}
return true;
}