/
qgslegend.cpp
1899 lines (1605 loc) · 48.2 KB
/
qgslegend.cpp
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/***************************************************************************
qgslegend.cpp - description
-------------------
begin : Sun Jul 28 2002
copyright : (C) 2002 by Gary E.Sherman
email : sherman at mrcc dot com
Romans 3:23=>Romans 6:23=>Romans 10:9,10=>Romans 12
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
/* $Id$ */
#include "qgsapplication.h"
#include "qgisapp.h"
#include "qgslogger.h"
#include "qgslegend.h"
#include "qgslegendgroup.h"
#include "qgslegendlayer.h"
#include "qgslegendpropertygroup.h"
#include "qgslegendsymbologyitem.h"
#include "qgsmapcanvas.h"
#include "qgsmapcanvasmap.h"
#include "qgsmaplayer.h"
#include "qgsmaplayerregistry.h"
#include "qgsmaprenderer.h"
#include "qgsproject.h"
#include "qgsrasterlayer.h"
#include "qgsvectorlayer.h"
#include <QFont>
#include <QDomDocument>
#include <QHeaderView>
#include <QMenu>
#include <QMessageBox>
#include <QMouseEvent>
#include <QPixmap>
#include <QTreeWidgetItem>
static const char *const ident_ = "$Id$";
const int AUTOSCROLL_MARGIN = 16;
QgsLegend::QgsLegend( QgsMapCanvas *canvas, QWidget * parent, const char *name )
: QTreeWidget( parent )
, mMousePressedFlag( false )
, mMapCanvas( canvas )
, mMinimumIconSize( 20, 20 )
, mChanging( false )
{
setObjectName( name );
connect( this, SIGNAL( itemChanged( QTreeWidgetItem*, int ) ),
this, SLOT( handleItemChange( QTreeWidgetItem*, int ) ) );
connect( this, SIGNAL( currentItemChanged( QTreeWidgetItem*, QTreeWidgetItem* ) ),
this, SLOT( handleCurrentItemChanged( QTreeWidgetItem*, QTreeWidgetItem* ) ) );
// project handling
connect( QgsProject::instance(), SIGNAL( readProject( const QDomDocument & ) ),
this, SLOT( readProject( const QDomDocument & ) ) );
connect( QgsProject::instance(), SIGNAL( writeProject( QDomDocument & ) ),
this, SLOT( writeProject( QDomDocument & ) ) );
// connect map layer registry signal to legend
connect( QgsMapLayerRegistry::instance(), SIGNAL( layerWillBeRemoved( QString ) ),
this, SLOT( removeLayer( QString ) ) );
connect( QgsMapLayerRegistry::instance(), SIGNAL( removedAll() ),
this, SLOT( removeAll() ) );
connect( QgsMapLayerRegistry::instance(), SIGNAL( layerWasAdded( QgsMapLayer* ) ),
this, SLOT( addLayer( QgsMapLayer * ) ) );
connect( mMapCanvas, SIGNAL( layersChanged() ),
this, SLOT( refreshCheckStates() ) );
// Initialise the line indicator widget.
mInsertionLine = new QWidget( viewport() );
hideLine();
mInsertionLine->setAutoFillBackground( true );
QPalette pal = mInsertionLine->palette();
pal.setColor( mInsertionLine->backgroundRole(), Qt::blue );
mInsertionLine->setPalette( pal );
setSortingEnabled( false );
setSelectionMode( QAbstractItemView::ExtendedSelection );
setDragEnabled( false );
setAutoScroll( true );
QFont f( "Arial", 10, QFont::Normal );
setFont( f );
QPalette palette;
palette.setColor( backgroundRole(), QColor( 192, 192, 192 ) );
setPalette( palette );
setColumnCount( 1 );
header()->setHidden( 1 );
setRootIsDecorated( true );
initPixmaps();
}
QgsLegend::~QgsLegend()
{
delete mInsertionLine;
}
#ifdef QGISDEBUG
void QgsLegend::showItem( QString msg, QTreeWidgetItem *item )
{
if ( !item )
{
QgsDebugMsg( msg + ": no item?" );
return;
}
QgsLegendItem *litem = dynamic_cast<QgsLegendItem *>( item );
QgsLegendGroup *group = dynamic_cast<QgsLegendGroup *>( item );
QgsLegendLayer *layer = dynamic_cast<QgsLegendLayer *>( item );
QString type;
if ( group )
type = "group";
else if ( layer )
type = "layer";
else if ( litem )
type = "litem";
else
type = "item";
QgsDebugMsg( QString( "%1: %2 %3 row:%4" ).arg( msg ).arg( type ).arg( item->text( 0 ) ).arg( indexFromItem( item ).row() ) );
}
#else
#define showItem(msg, item)
#endif
void QgsLegend::handleCurrentItemChanged( QTreeWidgetItem* current, QTreeWidgetItem* previous )
{
QgsMapLayer *layer = currentLayer();
if ( mMapCanvas )
{
mMapCanvas->setCurrentLayer( layer );
}
emit currentLayerChanged( layer );
}
int QgsLegend::addGroup( QString name, bool expand )
{
if ( name.isEmpty() )
name = tr( "group" ); // some default name if none specified
QgsLegendGroup *parent = dynamic_cast<QgsLegendGroup *>( currentItem() );
QgsLegendGroup *group;
if ( parent )
group = new QgsLegendGroup( parent, name );
else
group = new QgsLegendGroup( this, name );
QModelIndex groupIndex = indexFromItem( group );
setExpanded( groupIndex, expand );
setCurrentItem( group );
openEditor();
return groupIndex.row();
}
void QgsLegend::removeAll()
{
clear();
mPixmapWidthValues.clear();
mPixmapHeightValues.clear();
updateMapCanvasLayerSet();
setIconSize( mMinimumIconSize );
mDropTarget = 0;
}
void QgsLegend::selectAll( bool select )
{
if ( !mMapCanvas || mMapCanvas->isDrawing() )
{
return;
}
// Turn off rendering to improve speed.
bool renderFlagState = mMapCanvas->renderFlag();
if ( renderFlagState )
mMapCanvas->setRenderFlag( false );
for ( QTreeWidgetItem* theItem = firstItem(); theItem; theItem = nextItem( theItem ) )
{
QgsLegendItem* litem = dynamic_cast<QgsLegendItem *>( theItem );
if ( litem && litem->type() == QgsLegendItem::LEGEND_LAYER )
{
theItem->setCheckState( 0, select ? Qt::Checked : Qt::Unchecked );
handleItemChange( theItem, 0 );
}
}
// Turn on rendering (if it was on previously)
if ( renderFlagState )
mMapCanvas->setRenderFlag( true );
QgsProject::instance()->dirty( true );
}
void QgsLegend::removeGroup( int groupIndex )
{
QgsLegendGroup * lg = dynamic_cast<QgsLegendGroup *>( topLevelItem( groupIndex ) );
if ( lg )
{
removeGroup( lg );
}
}
void QgsLegend::removeLayer( QString layerId )
{
QgsDebugMsg( "called." );
for ( QTreeWidgetItem* theItem = firstItem(); theItem; theItem = nextItem( theItem ) )
{
QgsLegendItem *li = dynamic_cast<QgsLegendItem *>( theItem );
if ( li )
{
// save legend layer (parent of a legend layer file we're going to delete)
QgsLegendLayer* ll = qobject_cast<QgsLegendLayer *>( li );
if ( ll && ll->layer() && ll->layer()->id() == layerId )
{
removeItem( ll );
delete ll;
break;
}
}
}
updateMapCanvasLayerSet();
adjustIconSize();
}
void QgsLegend::mousePressEvent( QMouseEvent * e )
{
if ( e->button() == Qt::LeftButton )
{
mMousePressedFlag = true;
mDropTarget = itemAt( e->pos() );
}
else if ( e->button() == Qt::RightButton )
{
QTreeWidgetItem* item = itemAt( e->pos() );
if ( !item || item == currentItem() )
{
if ( !item )
setCurrentItem( 0 );
handleRightClickEvent( item, e->globalPos() );
}
}
QTreeWidget::mousePressEvent( e );
} // contentsMousePressEvent
void QgsLegend::mouseMoveEvent( QMouseEvent * e )
{
if ( !mMousePressedFlag )
{
QgsDebugMsg( "mouse not pressed" );
return;
}
if ( mItemsBeingMoved.isEmpty() && !selectedItems().isEmpty() )
{
if ( mDropTarget == itemAt( e->pos() ) )
return;
mLayersPriorToMove = layerIDs();
QgsDebugMsg( "layers prior to move: " + mLayersPriorToMove.join( ", " ) );
// record which items were selected and hide them
foreach( QTreeWidgetItem * item, selectedItems() )
{
item->setHidden( true );
mItemsBeingMoved << item;
}
// remove and unhide items, whose parent is already to be moved
foreach( QTreeWidgetItem * item, mItemsBeingMoved )
{
QTreeWidgetItem *parent = item->parent();
bool parentHidden = false;
while ( !parentHidden && parent )
{
parentHidden = parent->isHidden();
parent = parent->parent();
}
if ( parentHidden )
{
mItemsBeingMoved.removeOne( item );
item->setHidden( false );
}
}
setCursor( Qt::SizeVerCursor );
}
if ( mItemsBeingMoved.isEmpty() )
{
QgsDebugMsg( "nothing to move" );
return;
}
// change the cursor appropriate to if drop is allowed
QTreeWidgetItem* item = itemAt( e->pos() );
hideLine();
updateLineWidget();
scrollToItem( item );
mDropTarget = 0;
if ( item )
{
showItem( "moveMoveEvent" , item );
QgsLegendItem *litem = dynamic_cast<QgsLegendItem *>( item );
QgsLegendGroup *group = dynamic_cast<QgsLegendGroup *>( item );
QgsLegendLayer *layer = dynamic_cast<QgsLegendLayer *>( item );
while ( item->parent() && !group && !layer )
{
item = item->parent();
litem = dynamic_cast<QgsLegendItem *>( item );
group = dynamic_cast<QgsLegendGroup *>( item );
layer = dynamic_cast<QgsLegendLayer *>( item );
}
showItem( "layer/group" , item );
int line_x = visualItemRect( item ).left();
int line_y;
if ( layer )
{
QTreeWidgetItem *lastItem = item->childCount() > 0 && item->isExpanded() ? item->child( item->childCount() - 1 ) : item;
int y0 = visualItemRect( item ).top() + 1;
int y1 = visualItemRect( lastItem ).bottom() - 2;
mDropTarget = layer;
if ( e->y() < ( y0 + y1 ) / 2 )
{
QgsDebugMsg( "insert before layer" );
mDropAction = BEFORE;
line_y = y0;
}
else
{
QgsDebugMsg( "insert after layer" );
mDropAction = AFTER;
line_y = y1;
}
}
else if ( group )
{
if ( yCoordAboveCenter( litem, e->y() ) ) //over center of item
{
QgsDebugMsg( "insert before group" );
line_y = visualItemRect( item ).top() + 1;
mDropTarget = item;
mDropAction = BEFORE;
}
else // below center of item
{
QgsDebugMsg( "insert into group" );
line_y = visualItemRect( item ).bottom() - 2;
mDropTarget = item;
mDropAction = INSERT;
}
}
else
{
line_y = visualItemRect( item ).bottom() - 2;
}
showLine( line_y, line_x );
setCursor( QCursor( Qt::SizeVerCursor ) );
}
else if ( !item
&& e->pos().y() >= 0 && e->pos().y() < viewport()->height()
&& e->pos().x() >= 0 && e->pos().x() < viewport()->width() )
{
// Outside the listed items, but check if we are in the empty area
// of the viewport, so we can drop after the last top level item.
mDropTarget = topLevelItem( topLevelItemCount() - 1 );
mDropAction = AFTER;
QgsDebugMsg( "insert after last layer/group" );
showLine( visualItemRect( lastVisibleItem() ).bottom() + 1, 0 );
setCursor( QCursor( Qt::SizeVerCursor ) );
}
else
{
QgsDebugMsg( "No item here" );
setCursor( QCursor( Qt::ForbiddenCursor ) );
}
}
void QgsLegend::updateGroupCheckStates( QTreeWidgetItem *item )
{
QgsLegendGroup *lg = dynamic_cast< QgsLegendGroup * >( item );
if ( !lg )
return;
for ( int i = 0; i < item->childCount(); i++ )
{
updateGroupCheckStates( item->child( i ) );
}
Qt::CheckState theState = lg->pendingCheckState();
if ( theState != lg->checkState( 0 ) )
{
blockSignals( true );
lg->setCheckState( 0, theState );
blockSignals( false );
}
}
void QgsLegend::mouseReleaseEvent( QMouseEvent * e )
{
QTreeWidget::mouseReleaseEvent( e );
mMousePressedFlag = false;
if ( mItemsBeingMoved.isEmpty() )
return;
setCursor( QCursor( Qt::ArrowCursor ) );
hideLine();
// unhide
foreach( QTreeWidgetItem * item, mItemsBeingMoved )
{
item->setHidden( false );
}
if ( mDropTarget )
{
if ( mDropAction == BEFORE )
{
showItem( "before => drop after", mDropTarget );
QTreeWidgetItem *prev = previousSibling( mDropTarget );
if ( prev )
{
mDropTarget = prev;
showItem( "prev sibling", mDropTarget );
foreach( QTreeWidgetItem * item, mItemsBeingMoved )
{
moveItem( item, mDropTarget );
mDropTarget = item;
}
}
else
{
mDropTarget = mDropTarget->parent();
if ( mDropTarget )
{
showItem( "parent", mDropTarget );
mDropAction = INSERT;
}
else
{
mDropTarget = invisibleRootItem();
mDropAction = AFTER;
showItem( "root", mDropTarget );
}
}
}
if ( mDropAction == AFTER )
{
showItem( "drop after", mDropTarget );
foreach( QTreeWidgetItem * item, mItemsBeingMoved )
{
moveItem( item, mDropTarget );
mDropTarget = item;
}
}
if ( mDropAction == INSERT )
{
showItem( "insert into", mDropTarget );
foreach( QTreeWidgetItem * item, mItemsBeingMoved )
{
insertItem( item, mDropTarget );
}
}
mItemsBeingMoved.clear();
for ( int i = 0; i < topLevelItemCount(); i++ )
{
updateGroupCheckStates( topLevelItem( i ) );
}
}
else //no action
{
QgsDebugMsg( "Drop NO_ACTION" );
}
checkLayerOrderUpdate();
}
void QgsLegend::mouseDoubleClickEvent( QMouseEvent* e )
{
QgisApp::instance()->layerProperties();
}
void QgsLegend::handleRightClickEvent( QTreeWidgetItem* item, const QPoint& position )
{
if ( !mMapCanvas || mMapCanvas->isDrawing() )
{
return;
}
QMenu theMenu;
QgsLegendItem* li = dynamic_cast<QgsLegendItem *>( item );
if ( li )
{
if ( li->type() == QgsLegendItem::LEGEND_LAYER )
{
qobject_cast<QgsLegendLayer*>( li )->addToPopupMenu( theMenu );
if ( li->parent() )
{
theMenu.addAction( tr( "&Make to toplevel item" ), this, SLOT( makeToTopLevelItem() ) );
}
}
else if ( li->type() == QgsLegendItem::LEGEND_GROUP )
{
theMenu.addAction( QgisApp::getThemeIcon( "/mActionZoomToLayer.png" ),
tr( "Zoom to group" ), this, SLOT( legendLayerZoom() ) );
theMenu.addAction( QgisApp::getThemeIcon( "/mActionRemoveLayer.png" ),
tr( "&Remove" ), this, SLOT( legendGroupRemove() ) );
}
if ( li->type() == QgsLegendItem::LEGEND_LAYER || li->type() == QgsLegendItem::LEGEND_GROUP )
{
theMenu.addAction( tr( "Re&name" ), this, SLOT( openEditor() ) );
}
}
theMenu.addAction( QgisApp::getThemeIcon( "/folder_new.png" ), tr( "&Add group" ), this, SLOT( addGroup() ) );
theMenu.addAction( QgisApp::getThemeIcon( "/mActionExpandTree.png" ), tr( "&Expand all" ), this, SLOT( expandAll() ) );
theMenu.addAction( QgisApp::getThemeIcon( "/mActionCollapseTree.png" ), tr( "&Collapse all" ), this, SLOT( collapseAll() ) );
theMenu.exec( position );
}
void QgsLegend::initPixmaps()
{
mPixmaps.mOriginalPixmap = QgisApp::getThemePixmap( "/mActionFileSmall.png" );
mPixmaps.mInOverviewPixmap = QgisApp::getThemePixmap( "/mActionInOverview.png" );
mPixmaps.mEditablePixmap = QgisApp::getThemePixmap( "/mIconEditable.png" );
mPixmaps.mProjectionErrorPixmap = QgisApp::getThemePixmap( "/mIconProjectionProblem.png" );
}
Qt::CheckState QgsLegend::layerCheckState( QgsMapLayer * layer )
{
QgsLegendLayer * ll = findLegendLayer( layer );
return ll ? ll->checkState( 0 ) : Qt::Unchecked;
}
int QgsLegend::getItemPos( QTreeWidgetItem* item )
{
int counter = 1;
for ( QTreeWidgetItem* theItem = firstItem(); theItem; theItem = nextItem( theItem ) )
{
if ( theItem == item )
{
return counter;
}
++counter;
}
return -1;
}
void QgsLegend::addLayer( QgsMapLayer * layer )
{
if ( !mMapCanvas || mMapCanvas->isDrawing() )
{
return;
}
QgsLegendLayer* llayer = new QgsLegendLayer( layer );
//set the correct check states
blockSignals( true );
llayer->setCheckState( 0, llayer->isVisible() ? Qt::Checked : Qt::Unchecked );
blockSignals( false );
QgsLegendGroup *lg = dynamic_cast<QgsLegendGroup *>( currentItem() );
QSettings settings;
if ( lg && settings.value( "/qgis/addNewLayersToCurrentGroup", false ).toBool() )
{
lg->insertChild( 0, llayer );
}
else
{
insertTopLevelItem( 0, llayer );
setCurrentItem( llayer );
}
setItemExpanded( llayer, true );
refreshLayerSymbology( layer->id() );
updateMapCanvasLayerSet();
// first layer?
if ( mMapCanvas->layerCount() == 1 )
{
mMapCanvas->zoomToFullExtent();
mMapCanvas->clearExtentHistory();
}
//make the QTreeWidget item up-to-date
doItemsLayout();
}
void QgsLegend::setLayerVisible( QgsMapLayer * layer, bool visible )
{
QgsLegendLayer * ll = findLegendLayer( layer );
if ( ll )
{
ll->setCheckState( 0, visible ? Qt::Checked : Qt::Unchecked );
}
}
QgsLegendLayer* QgsLegend::currentLegendLayer()
{
QgsLegendItem* citem = dynamic_cast<QgsLegendItem *>( currentItem() );
if ( citem )
{
QgsLegendLayer* ll = qobject_cast<QgsLegendLayer *>( citem );
if ( ll )
{
return ll; //the current item is a legend layer, so return it
}
QgsLegendLayer* lpl = dynamic_cast<QgsLegendLayer *>( citem->parent() );
if ( lpl )
{
return lpl; //the parent of the current item is a legend layer, return it
}
}
return 0;
}
QgsMapLayer* QgsLegend::currentLayer()
{
QgsLegendLayer* ll = currentLegendLayer();
if ( ll )
{
return ll->layer();
}
else
{
return 0;
}
}
QList<QgsMapLayer *> QgsLegend::selectedLayers()
{
QList<QgsMapLayer *> layers;
foreach( QTreeWidgetItem * item, selectedItems() )
{
QgsLegendLayer *ll = dynamic_cast<QgsLegendLayer *>( item );
if ( ll )
layers << ll->layer();
}
return layers;
}
bool QgsLegend::setCurrentLayer( QgsMapLayer *layer )
{
QgsLegendLayer *ll = findLegendLayer( layer );
if ( !ll )
return false;
setCurrentItem( ll );
clearSelection();
return true;
}
void QgsLegend::legendGroupRemove()
{
if ( !mMapCanvas || mMapCanvas->isDrawing() )
{
return;
}
QgsLegendGroup* lg = dynamic_cast<QgsLegendGroup *>( currentItem() );
if ( lg )
{
removeGroup( lg );
}
}
void QgsLegend::removeGroup( QgsLegendGroup *lg )
{
if ( !mMapCanvas || mMapCanvas->isDrawing() )
{
return;
}
//delete the legend layers first
QTreeWidgetItem * child = lg->child( 0 );
while ( child )
{
QgsLegendLayer *cl = dynamic_cast<QgsLegendLayer *>( child );
QgsLegendGroup *cg = dynamic_cast<QgsLegendGroup *>( child );
if ( cl )
QgsMapLayerRegistry::instance()->removeMapLayer( cl->layer()->id() );
else if ( cg )
removeGroup( cg );
child = lg->child( 0 );
}
delete lg;
adjustIconSize();
}
void QgsLegend::moveLayer( QgsMapLayer *ml, int groupIndex )
{
if ( !ml )
return;
QgsLegendLayer *layer = findLegendLayer( ml->id() );
if ( !layer )
return;
QgsLegendGroup *group = dynamic_cast<QgsLegendGroup*>( topLevelItem( groupIndex ) );
if ( !group )
return;
insertItem( layer, group );
}
void QgsLegend::legendLayerShowInOverview()
{
if ( !mMapCanvas || mMapCanvas->isDrawing() )
{
return;
}
QgsLegendItem* li = dynamic_cast<QgsLegendItem *>( currentItem() );
if ( !li )
return;
if ( li->type() == QgsLegendItem::LEGEND_LAYER )
return;
QgsLegendLayer* ll = qobject_cast<QgsLegendLayer *>( li );
if ( !ll ) return;
ll->showInOverview();
}
void QgsLegend::expandAll()
{
for ( QTreeWidgetItem* theItem = firstItem(); theItem; theItem = nextItem( theItem ) )
{
setExpanded( indexFromItem( theItem ), true );
}
}
void QgsLegend::collapseAll()
{
for ( QTreeWidgetItem* theItem = firstItem(); theItem; theItem = nextItem( theItem ) )
{
setExpanded( indexFromItem( theItem ), false );
}
}
bool QgsLegend::writeXML( QDomNode &legendnode, QDomDocument &document )
{
QList<QTreeWidgetItem*> items;
for ( int i = 0; i < topLevelItemCount(); i++ )
{
items << topLevelItem( i );
}
return writeXML( items, legendnode, document );
}
bool QgsLegend::writeXML( QList<QTreeWidgetItem *> items, QDomNode &node, QDomDocument &document )
{
foreach( QTreeWidgetItem * currentItem, items )
{
QgsLegendItem *item = dynamic_cast<QgsLegendItem *>( currentItem );
if ( !item )
continue;
if ( item->type() == QgsLegendItem::LEGEND_GROUP )
{
QDomElement legendgroupnode = document.createElement( "legendgroup" );
legendgroupnode.setAttribute( "open", isItemExpanded( item ) ? "true" : "false" );
legendgroupnode.setAttribute( "name", item->text( 0 ) );
Qt::CheckState cstate = item->checkState( 0 );
if ( cstate == Qt::Checked )
{
legendgroupnode.setAttribute( "checked", "Qt::Checked" );
}
else if ( cstate == Qt::Unchecked )
{
legendgroupnode.setAttribute( "checked", "Qt::Unchecked" );
}
else if ( cstate == Qt::PartiallyChecked )
{
legendgroupnode.setAttribute( "checked", "Qt::PartiallyChecked" );
}
QList<QTreeWidgetItem *> children;
for ( int i = 0; i < currentItem->childCount(); i++ )
{
children << currentItem->child( i );
}
writeXML( children, legendgroupnode, document );
node.appendChild( legendgroupnode );
}
else if ( item->type() == QgsLegendItem::LEGEND_LAYER )
{
QDomElement legendlayernode = document.createElement( "legendlayer" );
legendlayernode.setAttribute( "open", isItemExpanded( item ) ? "true" : "false" );
Qt::CheckState cstate = item->checkState( 0 );
if ( cstate == Qt::Checked )
{
legendlayernode.setAttribute( "checked", "Qt::Checked" );
}
else if ( cstate == Qt::Unchecked )
{
legendlayernode.setAttribute( "checked", "Qt::Unchecked" );
}
else if ( cstate == Qt::PartiallyChecked )
{
legendlayernode.setAttribute( "checked", "Qt::PartiallyChecked" );
}
legendlayernode.setAttribute( "name", item->text( 0 ) );
for ( int i = 0; i < item->childCount(); i++ )
{
QTreeWidgetItem *child = item->child( i );
QgsLegendItem *litem = dynamic_cast<QgsLegendItem *>( child );
if ( !litem )
{
QgsDebugMsg( "tree widget item not a legend item" );
continue;
}
if ( litem->type() == QgsLegendItem::LEGEND_PROPERTY_GROUP )
{
QDomElement legendpropertynode = document.createElement( "propertygroup" );
legendpropertynode.setAttribute( "open", isItemExpanded( item ) ? "true" : "false" );
legendlayernode.appendChild( legendpropertynode );
}
else if ( litem->type() == QgsLegendItem::LEGEND_SYMBOL_GROUP )
{
QDomElement legendsymbolnode = document.createElement( "symbolgroup" );
legendsymbolnode.setAttribute( "open", isItemExpanded( item ) ? "true" : "false" );
legendlayernode.appendChild( legendsymbolnode );
}
else
{
QgsDebugMsg( "unexpected legend item type " + QString::number( litem->type() ) );
}
}
node.appendChild( legendlayernode );
// save the information about layer
// emulate a legend layer file group and a legend layer file
// to keep it compatible with older projects
QgsLegendLayer *ll = dynamic_cast<QgsLegendLayer *>( item );
QgsMapLayer* layer = ll->layer();
legendlayernode.setAttribute( "showFeatureCount", ll->showFeatureCount() );
QDomElement layerfilegroupnode = document.createElement( "filegroup" );
layerfilegroupnode.setAttribute( "open", isItemExpanded( item ) ? "true" : "false" );
layerfilegroupnode.setAttribute( "hidden", isItemHidden( item ) ? "true" : "false" );
legendlayernode.appendChild( layerfilegroupnode );
QDomElement legendlayerfilenode = document.createElement( "legendlayerfile" );
// layer id
legendlayerfilenode.setAttribute( "layerid", layer->id() );
layerfilegroupnode.appendChild( legendlayerfilenode );
// visible flag
legendlayerfilenode.setAttribute( "visible", ll->isVisible() );
// show in overview flag
legendlayerfilenode.setAttribute( "isInOverview", ll->isInOverview() );
}
else
{
QgsDebugMsg( "unexpected legend item type " + QString::number( item->type() ) );
}
}
return true;
}
bool QgsLegend::readXML( QgsLegendGroup *parent, const QDomNode &node )
{
const QDomNodeList &l = node.childNodes();
for ( int i = 0; i < l.count(); i++ )
{
QDomNode child = l.at( i );
QDomElement childelem = child.toElement();
QString name = childelem.attribute( "name" );
//test every possibility of element...
if ( childelem.tagName() == "legendgroup" )
{
QgsLegendGroup *theGroup;
if ( parent )
theGroup = new QgsLegendGroup( parent, name );
else
theGroup = new QgsLegendGroup( this, name );
//set the checkbox of the legend group to the right state
blockSignals( true );
QString checked = childelem.attribute( "checked" );
if ( checked == "Qt::Checked" )
{
theGroup->setCheckState( 0, Qt::Checked );
}
else if ( checked == "Qt::Unchecked" )
{
theGroup->setCheckState( 0, Qt::Unchecked );
}
else if ( checked == "Qt::PartiallyChecked" )
{
theGroup->setCheckState( 0, Qt::PartiallyChecked );
}
blockSignals( false );
readXML( theGroup, child );
if ( childelem.attribute( "open" ) == "true" )
{
expandItem( theGroup );
}
else
{
collapseItem( theGroup );
}
}
else if ( childelem.tagName() == "legendlayer" )
{
bool isOpen;
QgsLegendLayer* currentLayer = readLayerFromXML( childelem, isOpen );
if ( !currentLayer )
return false;
// add to tree - either as a top-level node or a child of a group
if ( parent )
{
parent->addChild( currentLayer );
}
else
{
addTopLevelItem( currentLayer );