bool QgsAbstractFeatureIterator::nextFeature( QgsFeature& f )
{
bool dataOk = false;
switch ( mRequest.filterType() )
{
case QgsFeatureRequest::FilterExpression:
dataOk = nextFeatureFilterExpression( f );
break;
case QgsFeatureRequest::FilterFids:
dataOk = nextFeatureFilterFids( f );
break;
default:
dataOk = fetchFeature( f );
break;
}
// simplify the geometry using the simplifier configured
if ( dataOk && mLocalSimplification )
{
QgsGeometry* geometry = f.geometry();
if ( geometry ) simplify( f );
}
return dataOk;
}
bool QgsOgrFeatureIterator::nextFeatureFilterExpression( QgsFeature& f )
{
if ( !mExpressionCompiled )
return QgsAbstractFeatureIterator::nextFeatureFilterExpression( f );
else
return fetchFeature( f );
}
bool QgsAbstractFeatureIterator::nextFeatureFilterFids( QgsFeature& f )
{
while ( fetchFeature( f ) )
{
if ( mRequest.filterFids().contains( f.id() ) )
return true;
}
return false;
}
bool QgsAbstractFeatureIterator::nextFeatureFilterExpression( QgsFeature& f )
{
while ( fetchFeature( f ) )
{
if ( mRequest.filterExpression()->evaluate( f ).toBool() )
return true;
}
return false;
}
bool QgsAbstractFeatureIterator::nextFeature( QgsFeature& f )
{
bool dataOk = false;
if ( mRequest.limit() >= 0 && mFetchedCount >= mRequest.limit() )
{
return false;
}
if ( mUseCachedFeatures )
{
if ( mFeatureIterator != mCachedFeatures.constEnd() )
{
f = mFeatureIterator->mFeature;
++mFeatureIterator;
dataOk = true;
}
else
{
dataOk = false;
// even the zombie dies at this point...
mZombie = false;
}
}
else
{
switch ( mRequest.filterType() )
{
case QgsFeatureRequest::FilterExpression:
dataOk = nextFeatureFilterExpression( f );
break;
case QgsFeatureRequest::FilterFids:
dataOk = nextFeatureFilterFids( f );
break;
default:
dataOk = fetchFeature( f );
break;
}
}
// simplify the geometry using the simplifier configured
if ( dataOk && mLocalSimplification )
{
if ( f.constGeometry() )
simplify( f );
}
if ( dataOk )
mFetchedCount++;
return dataOk;
}
void QgsMapTip::showMapTip( QgsMapLayer *thepLayer,
QgsPoint & theMapPosition,
QPoint & thePixelPosition,
QgsMapCanvas *thepMapCanvas )
{
// Do the search using the active layer and the preferred label
// field for the layer. The label field must be defined in the layer configuration
// file/database. The code required to do this is similar to identify, except
// we only want the first qualifying feature and we will only display the
// field defined as the label field in the layer configuration file/database.
//
// TODO: Define the label (display) field for each map layer in the map configuration file/database
// Show the maptip on the canvas
QString myTipText = fetchFeature( thepLayer, theMapPosition, thepMapCanvas );
mMapTipVisible = !myTipText.isEmpty();
if ( mMapTipVisible )
{
QToolTip::showText( thepMapCanvas->mapToGlobal( thePixelPosition ), myTipText, thepMapCanvas );
// store the point so we can use it to clear the maptip later
mLastPosition = thePixelPosition;
}
}
void QgsMapTip::showMapTip( QgsMapLayer *pLayer,
QgsPoint & mapPosition,
QPoint & thePixelPosition,
QgsMapCanvas *pMapCanvas )
{
// Do the search using the active layer and the preferred label field for the
// layer. The label field must be defined in the layer configuration
// file/database. The code required to do this is similar to identify, except
// we only want the first qualifying feature and we will only display the
// field defined as the label field in the layer configuration file/database
// Show the maptip on the canvas
QString tipText, lastTipText, tipHtml, bodyStyle, containerStyle,
backgroundColor, borderColor;
delete mWidget;
mWidget = new QWidget( pMapCanvas );
mWebView = new QgsWebView( mWidget );
#if WITH_QTWEBKIT
mWebView->page()->setLinkDelegationPolicy( QWebPage::DelegateAllLinks );//Handle link clicks by yourself
mWebView->setContextMenuPolicy( Qt::NoContextMenu ); //No context menu is allowed if you don't need it
connect( mWebView, SIGNAL( linkClicked( QUrl ) ), this, SLOT( onLinkClicked( QUrl ) ) );
#endif
mWebView->page()->settings()->setAttribute(
QWebSettings::DeveloperExtrasEnabled, true );
mWebView->page()->settings()->setAttribute(
QWebSettings::JavascriptEnabled, true );
QHBoxLayout* layout = new QHBoxLayout;
layout->addWidget( mWebView );
mWidget->setSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
mWidget->setLayout( layout );
//assure the map tip is never larger than half the map canvas
const int MAX_WIDTH = pMapCanvas->geometry().width() / 2;
const int MAX_HEIGHT = pMapCanvas->geometry().height() / 2;
mWidget->setMaximumSize( MAX_WIDTH, MAX_HEIGHT );
// start with 0 size,
// the content will automatically make it grow up to MaximumSize
mWidget->resize( 0, 0 );
backgroundColor = mWidget->palette().base().color().name();
borderColor = mWidget->palette().shadow().color().name();
mWidget->setStyleSheet( QString(
".QWidget{"
"border: 1px solid %1;"
"background-color: %2;}" ).arg(
borderColor, backgroundColor ) );
tipText = fetchFeature( pLayer, mapPosition, pMapCanvas );
mMapTipVisible = !tipText.isEmpty();
if ( !mMapTipVisible )
{
clear();
return;
}
if ( tipText == lastTipText )
{
return;
}
bodyStyle = QString(
"background-color: %1;"
"margin: 0;" ).arg( backgroundColor );
containerStyle = QString(
"display: inline-block;"
"margin: 0px" );
tipHtml = QString(
"<html>"
"<body style='%1'>"
"<div id='QgsWebViewContainer' style='%2'>%3</div>"
"</body>"
"</html>" ).arg( bodyStyle, containerStyle, tipText );
mWidget->move( thePixelPosition.x(),
thePixelPosition.y() );
mWebView->setHtml( tipHtml );
lastTipText = tipText;
mWidget->show();
#if WITH_QTWEBKIT
int scrollbarWidth = mWebView->page()->mainFrame()->scrollBarGeometry(
Qt::Vertical ).width();
int scrollbarHeight = mWebView->page()->mainFrame()->scrollBarGeometry(
Qt::Horizontal ).height();
if ( scrollbarWidth > 0 || scrollbarHeight > 0 )
{
// Get the content size
QWebElement container = mWebView->page()->mainFrame()->findFirstElement(
QStringLiteral( "#QgsWebViewContainer" ) );
int width = container.geometry().width() + 5 + scrollbarWidth;
int height = container.geometry().height() + 5 + scrollbarHeight;
mWidget->resize( width, height );
}
#endif
}
