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qgscomposeritemgroup.cpp
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qgscomposeritemgroup.cpp
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/***************************************************************************
qgscomposeritemgroup.cpp
------------------------
begin : 2nd June 2008
copyright : (C) 2008 by Marco Hugentobler
email : marco dot hugentobler at karto dot baug dot ethz 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 "qgscomposeritemgroup.h"
#include "qgscomposition.h"
#include <QPen>
#include <QPainter>
QgsComposerItemGroup::QgsComposerItemGroup( QgsComposition* c )
: QgsComposerItem( c )
{
setZValue( 90 );
show();
}
QgsComposerItemGroup::~QgsComposerItemGroup()
{
QSet<QgsComposerItem*>::iterator itemIt = mItems.begin();
for ( ; itemIt != mItems.end(); ++itemIt )
{
if ( *itemIt )
{
mComposition->removeItem( *itemIt );
( *itemIt )->setFlag( QGraphicsItem::ItemIsSelectable, true );
}
}
}
void QgsComposerItemGroup::addItem( QgsComposerItem* item )
{
if ( !item )
{
return;
}
if ( mItems.contains( item ) )
{
return;
}
connect( item, SIGNAL( destroyed() ), this, SLOT( itemDestroyed() ) );
mItems.insert( item );
item->setSelected( false );
item->setFlag( QGraphicsItem::ItemIsSelectable, false ); //item in groups cannot be selected
//update extent (which is in scene coordinates)
double minXItem = item->pos().x();
double minYItem = item->pos().y();
double maxXItem = minXItem + item->rect().width();
double maxYItem = minYItem + item->rect().height();
if ( mSceneBoundingRectangle.isEmpty() ) //we add the first item
{
mSceneBoundingRectangle.setLeft( minXItem );
mSceneBoundingRectangle.setTop( minYItem );
mSceneBoundingRectangle.setRight( maxXItem );
mSceneBoundingRectangle.setBottom( maxYItem );
}
else
{
if ( minXItem < mSceneBoundingRectangle.left() )
{
mSceneBoundingRectangle.setLeft( minXItem );
}
if ( minYItem < mSceneBoundingRectangle.top() )
{
mSceneBoundingRectangle.setTop( minYItem );
}
if ( maxXItem > mSceneBoundingRectangle.right() )
{
mSceneBoundingRectangle.setRight( maxXItem );
}
if ( maxYItem > mSceneBoundingRectangle.bottom() )
{
mSceneBoundingRectangle.setBottom( maxYItem );
}
}
QgsComposerItem::setSceneRect( mSceneBoundingRectangle ); //call method of superclass to avoid repositioning of items
}
void QgsComposerItemGroup::removeItems()
{
QSet<QgsComposerItem*>::iterator item_it = mItems.begin();
for ( ; item_it != mItems.end(); ++item_it )
{
( *item_it )->setFlag( QGraphicsItem::ItemIsSelectable, true ); //enable item selection again
( *item_it )->setSelected( true );
}
mItems.clear();
}
void QgsComposerItemGroup::itemDestroyed()
{
mItems.remove( static_cast<QgsComposerItem*>( sender() ) );
}
void QgsComposerItemGroup::paint( QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget )
{
Q_UNUSED( option );
Q_UNUSED( widget );
drawFrame( painter );
if ( isSelected() )
{
drawSelectionBoxes( painter );
}
}
void QgsComposerItemGroup::setSceneRect( const QRectF& rectangle )
{
//calculate values between 0 and 1 for boundaries of all contained items, depending on their positions in the item group rectangle.
//then position the item boundaries in the new item group rect such that these values are the same
double xLeftCurrent = pos().x();
double xRightCurrent = xLeftCurrent + rect().width();
double yTopCurrent = pos().y();
double yBottomCurrent = yTopCurrent + rect().height();
double xItemLeft, xItemRight, yItemTop, yItemBottom;
double xItemLeftNew, xItemRightNew, yItemTopNew, yItemBottomNew;
double xParamLeft, xParamRight, yParamTop, yParamBottom;
QSet<QgsComposerItem*>::iterator item_it = mItems.begin();
for ( ; item_it != mItems.end(); ++item_it )
{
xItemLeft = ( *item_it )->pos().x();
xItemRight = xItemLeft + ( *item_it )->rect().width();
yItemTop = ( *item_it )->pos().y();
yItemBottom = yItemTop + ( *item_it )->rect().height();
xParamLeft = ( xItemLeft - xLeftCurrent ) / ( xRightCurrent - xLeftCurrent );
xParamRight = ( xItemRight - xLeftCurrent ) / ( xRightCurrent - xLeftCurrent );
yParamTop = ( yItemTop - yTopCurrent ) / ( yBottomCurrent - yTopCurrent );
yParamBottom = ( yItemBottom - yTopCurrent ) / ( yBottomCurrent - yTopCurrent );
xItemLeftNew = xParamLeft * rectangle.right() + ( 1 - xParamLeft ) * rectangle.left();
xItemRightNew = xParamRight * rectangle.right() + ( 1 - xParamRight ) * rectangle.left();
yItemTopNew = yParamTop * rectangle.bottom() + ( 1 - yParamTop ) * rectangle.top();
yItemBottomNew = yParamBottom * rectangle.bottom() + ( 1 - yParamBottom ) * rectangle.top();
( *item_it )->setSceneRect( QRectF( xItemLeftNew, yItemTopNew, xItemRightNew - xItemLeftNew, yItemBottomNew - yItemTopNew ) );
}
QgsComposerItem::setSceneRect( rectangle );
}
void QgsComposerItemGroup::drawFrame( QPainter* p )
{
if ( !mComposition )
{
return;
}
if ( mFrame && mComposition->plotStyle() == QgsComposition::Preview )
{
QPen newPen( pen() );
newPen.setStyle( Qt::DashLine );
newPen.setColor( QColor( 128, 128, 128, 128 ) );
p->setPen( newPen );
p->setRenderHint( QPainter::Antialiasing, true );
p->drawRect( QRectF( 0, 0, rect().width(), rect().height() ) );
}
}
bool QgsComposerItemGroup::writeXML( QDomElement& elem, QDomDocument & doc ) const
{
QDomElement group = doc.createElement( "ComposerItemGroup" );
QSet<QgsComposerItem*>::const_iterator itemIt = mItems.begin();
for ( ; itemIt != mItems.end(); ++itemIt )
{
QDomElement item = doc.createElement( "ComposerItemGroupElement" );
item.setAttribute( "uuid", ( *itemIt )->uuid() );
group.appendChild( item );
}
elem.appendChild( group );
return _writeXML( group, doc );
}
bool QgsComposerItemGroup::readXML( const QDomElement& itemElem, const QDomDocument& doc )
{
//restore general composer item properties
QDomNodeList composerItemList = itemElem.elementsByTagName( "ComposerItem" );
if ( composerItemList.size() > 0 )
{
QDomElement composerItemElem = composerItemList.at( 0 ).toElement();
_readXML( composerItemElem, doc );
}
QList<QGraphicsItem *> items = mComposition->items();
QDomNodeList elementNodes = itemElem.elementsByTagName( "ComposerItemGroupElement" );
for ( int i = 0; i < elementNodes.count(); ++i )
{
QDomNode elementNode = elementNodes.at( i );
if ( !elementNode.isElement() )
continue;
QString uuid = elementNode.toElement().attribute( "uuid" );
for ( QList<QGraphicsItem *>::iterator it = items.begin(); it != items.end(); ++it )
{
QgsComposerItem *item = dynamic_cast<QgsComposerItem *>( *it );
if ( item && ( item->mUuid == uuid || item->mTemplateUuid == uuid ) )
{
addItem( item );
break;
}
}
}
return true;
}