QgsComposerLabel::QgsComposerLabel( QgsComposition *composition ):
QgsComposerItem( composition ), mHtmlState( 0 ), mHtmlUnitsToMM( 1.0 ),
mHtmlLoaded( false ), mMargin( 1.0 ), mFontColor( QColor( 0, 0, 0 ) ),
mHAlignment( Qt::AlignLeft ), mVAlignment( Qt::AlignTop ),
mExpressionFeature( 0 ), mExpressionLayer( 0 )
{
mHtmlUnitsToMM = htmlUnitsToMM();
//get default composer font from settings
QSettings settings;
QString defaultFontString = settings.value( "/Composer/defaultFont" ).toString();
if ( !defaultFontString.isEmpty() )
{
mFont.setFamily( defaultFontString );
}
//default to a 10 point font size
mFont.setPointSizeF( 10 );
//default to no background
setBackgroundEnabled( false );
if ( mComposition && mComposition->atlasMode() == QgsComposition::PreviewAtlas )
{
//a label added while atlas preview is enabled needs to have the expression context set,
//otherwise fields in the label aren't correctly evaluated until atlas preview feature changes (#9457)
setExpressionContext( mComposition->atlasComposition().currentFeature(), mComposition->atlasComposition().coverageLayer() );
}
//connect to atlas feature changes
//to update the expression context
connect( &mComposition->atlasComposition(), SIGNAL( featureChanged( QgsFeature* ) ), this, SLOT( refreshExpressionContext() ) );
}
QgsComposerLabel::QgsComposerLabel( QgsComposition *composition )
: QgsComposerItem( composition )
, mHtmlState( 0 )
, mHtmlUnitsToMM( 1.0 )
, mHtmlLoaded( false )
, mMarginX( 1.0 )
, mMarginY( 1.0 )
, mFontColor( QColor( 0, 0, 0 ) )
, mHAlignment( Qt::AlignLeft )
, mVAlignment( Qt::AlignTop )
, mExpressionLayer( nullptr )
, mDistanceArea( nullptr )
{
mDistanceArea = new QgsDistanceArea();
mHtmlUnitsToMM = htmlUnitsToMM();
//get default composer font from settings
QSettings settings;
QString defaultFontString = settings.value( QStringLiteral( "/Composer/defaultFont" ) ).toString();
if ( !defaultFontString.isEmpty() )
{
mFont.setFamily( defaultFontString );
}
//default to a 10 point font size
mFont.setPointSizeF( 10 );
//default to no background
setBackgroundEnabled( false );
//a label added while atlas preview is enabled needs to have the expression context set,
//otherwise fields in the label aren't correctly evaluated until atlas preview feature changes (#9457)
refreshExpressionContext();
if ( mComposition )
{
//connect to atlas feature changes
//to update the expression context
connect( &mComposition->atlasComposition(), SIGNAL( featureChanged( QgsFeature* ) ), this, SLOT( refreshExpressionContext() ) );
}
mWebPage = new QgsWebPage( this );
mWebPage->setIdentifier( tr( "Composer label item" ) );
mWebPage->setNetworkAccessManager( QgsNetworkAccessManager::instance() );
//This makes the background transparent. Found on http://blog.qt.digia.com/blog/2009/06/30/transparent-qwebview-or-qwebpage/
QPalette palette = mWebPage->palette();
palette.setBrush( QPalette::Base, Qt::transparent );
mWebPage->setPalette( palette );
//webPage->setAttribute(Qt::WA_OpaquePaintEvent, false); //this does not compile, why ?
mWebPage->mainFrame()->setZoomFactor( 10.0 );
mWebPage->mainFrame()->setScrollBarPolicy( Qt::Horizontal, Qt::ScrollBarAlwaysOff );
mWebPage->mainFrame()->setScrollBarPolicy( Qt::Vertical, Qt::ScrollBarAlwaysOff );
connect( mWebPage, SIGNAL( loadFinished( bool ) ), SLOT( loadingHtmlFinished( bool ) ) );
}
QgsComposerHtml::QgsComposerHtml( QgsComposition* c, bool createUndoCommands ): QgsComposerMultiFrame( c, createUndoCommands ),
mWebPage( 0 ), mLoaded( false ), mHtmlUnitsToMM( 1.0 )
{
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( QgsComposition* c, bool createUndoCommands )
: QgsComposerMultiFrame( c, createUndoCommands )
, mContentMode( QgsComposerHtml::Url )
, mWebPage( nullptr )
, mLoaded( false )
, mHtmlUnitsToMM( 1.0 )
, mRenderedPage( nullptr )
, mEvaluateExpressions( true )
, mUseSmartBreaks( true )
, mMaxBreakDistance( 10 )
, mExpressionLayer( nullptr )
, mDistanceArea( nullptr )
, mEnableUserStylesheet( false )
, mFetcher( nullptr )
{
mDistanceArea = new QgsDistanceArea();
mHtmlUnitsToMM = htmlUnitsToMM();
mWebPage = new QgsWebPage();
mWebPage->setIdentifier( tr( "Composer HTML item" ) );
mWebPage->mainFrame()->setScrollBarPolicy( Qt::Horizontal, Qt::ScrollBarAlwaysOff );
mWebPage->mainFrame()->setScrollBarPolicy( Qt::Vertical, Qt::ScrollBarAlwaysOff );
//This makes the background transparent. Found on http://blog.qt.digia.com/blog/2009/06/30/transparent-qwebview-or-qwebpage/
QPalette palette = mWebPage->palette();
palette.setBrush( QPalette::Base, Qt::transparent );
mWebPage->setPalette( palette );
mWebPage->setNetworkAccessManager( QgsNetworkAccessManager::instance() );
QObject::connect( mWebPage, SIGNAL( loadFinished( bool ) ), this, SLOT( frameLoaded( bool ) ) );
if ( mComposition )
{
QObject::connect( mComposition, SIGNAL( itemRemoved( QgsComposerItem* ) ), this, SLOT( handleFrameRemoval( QgsComposerItem* ) ) );
}
// data defined strings
mDataDefinedNames.insert( QgsComposerObject::SourceUrl, QString( "dataDefinedSourceUrl" ) );
if ( mComposition && mComposition->atlasMode() == QgsComposition::PreviewAtlas )
{
//a html item added while atlas preview is enabled needs to have the expression context set,
//otherwise fields in the html aren't correctly evaluated until atlas preview feature changes (#9457)
setExpressionContext( mComposition->atlasComposition().feature(), mComposition->atlasComposition().coverageLayer() );
}
//connect to atlas feature changes
//to update the expression context
connect( &mComposition->atlasComposition(), SIGNAL( featureChanged( QgsFeature* ) ), this, SLOT( refreshExpressionContext() ) );
mFetcher = new QgsNetworkContentFetcher();
connect( mFetcher, SIGNAL( finished() ), this, SLOT( frameLoaded() ) );
}
QgsComposerHtml::QgsComposerHtml( QgsComposition* c, bool createUndoCommands ): QgsComposerMultiFrame( c, createUndoCommands ),
mWebPage( 0 ),
mLoaded( false ),
mHtmlUnitsToMM( 1.0 ),
mRenderedPage( 0 ),
mUseSmartBreaks( true ),
mMaxBreakDistance( 10 )
{
mHtmlUnitsToMM = htmlUnitsToMM();
mWebPage = new QWebPage();
mWebPage->setNetworkAccessManager( QgsNetworkAccessManager::instance() );
QObject::connect( mWebPage, SIGNAL( loadFinished( bool ) ), this, SLOT( frameLoaded( bool ) ) );
if ( mComposition )
{
QObject::connect( mComposition, SIGNAL( itemRemoved( QgsComposerItem* ) ), this, SLOT( handleFrameRemoval( QgsComposerItem* ) ) );
connect( mComposition, SIGNAL( refreshItemsTriggered() ), this, SLOT( loadHtml() ) );
}
}
QgsComposerLabel::QgsComposerLabel( QgsComposition *composition ):
QgsComposerItem( composition ), mHtmlState( 0 ), mHtmlUnitsToMM( 1.0 ),
mHtmlLoaded( false ), mMargin( 1.0 ), mFontColor( QColor( 0, 0, 0 ) ),
mHAlignment( Qt::AlignLeft ), mVAlignment( Qt::AlignTop ),
mExpressionFeature( 0 ), mExpressionLayer( 0 )
{
mHtmlUnitsToMM = htmlUnitsToMM();
//get default composer font from settings
QSettings settings;
QString defaultFontString = settings.value( "/Composer/defaultFont" ).toString();
if ( !defaultFontString.isEmpty() )
{
mFont.setFamily( defaultFontString );
}
//default to a 10 point font size
mFont.setPointSizeF( 10 );
}
QgsComposerHtml::QgsComposerHtml( QgsComposition* c, bool createUndoCommands ): QgsComposerMultiFrame( c, createUndoCommands ),
mContentMode( QgsComposerHtml::Url ),
mWebPage( 0 ),
mLoaded( false ),
mHtmlUnitsToMM( 1.0 ),
mRenderedPage( 0 ),
mEvaluateExpressions( true ),
mUseSmartBreaks( true ),
mMaxBreakDistance( 10 ),
mExpressionFeature( 0 ),
mExpressionLayer( 0 ),
mEnableUserStylesheet( false )
{
mHtmlUnitsToMM = htmlUnitsToMM();
mWebPage = new QWebPage();
mWebPage->setNetworkAccessManager( QgsNetworkAccessManager::instance() );
QObject::connect( mWebPage, SIGNAL( loadFinished( bool ) ), this, SLOT( frameLoaded( bool ) ) );
if ( mComposition )
{
QObject::connect( mComposition, SIGNAL( itemRemoved( QgsComposerItem* ) ), this, SLOT( handleFrameRemoval( QgsComposerItem* ) ) );
}
// data defined strings
mDataDefinedNames.insert( QgsComposerObject::SourceUrl, QString( "dataDefinedSourceUrl" ) );
if ( mComposition && mComposition->atlasMode() == QgsComposition::PreviewAtlas )
{
//a html item added while atlas preview is enabled needs to have the expression context set,
//otherwise fields in the html aren't correctly evaluated until atlas preview feature changes (#9457)
setExpressionContext( mComposition->atlasComposition().currentFeature(), mComposition->atlasComposition().coverageLayer() );
}
//connect to atlas feature changes
//to update the expression context
connect( &mComposition->atlasComposition(), SIGNAL( featureChanged( QgsFeature* ) ), this, SLOT( refreshExpressionContext() ) );
}
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 = mMaxBreakDistance * htmlUnitsToMM();
//loop through all lines just before ideal break location, up to max distance
//of maxSearchDistance
int changes = 0;
QRgb currentColor;
bool currentPixelTransparent = false;
bool previousPixelTransparent = false;
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 );
currentPixelTransparent = qAlpha( pixelColor ) == 0;
if ( pixelColor != currentColor && !( currentPixelTransparent && previousPixelTransparent ) )
{
//color has changed
currentColor = pixelColor;
changes++;
}
previousPixelTransparent = currentPixelTransparent;
}
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 color 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();
}
