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@jef-n
jef-n committed Nov 27, 2011
1 parent 9ff0298 commit 8841d32
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275 changes: 275 additions & 0 deletions src/app/legend/qgslayerorder.cpp
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/***************************************************************************
qgslayerorder.cpp - description
-------------------
begin : 2011-11-09
copyright : (C) 2011 by Juergen E. Fischer, norBIT GmbH
email : jef at norbit dot de
***************************************************************************/

/***************************************************************************
* *
* 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 "qgslayerorder.h"
#include "qgsmapcanvas.h"
#include "qgsmaplayer.h"
#include "qgslogger.h"
#include "qgslegend.h"
#include "qgslegendlayer.h"
#include "qgsproject.h"

#include <QMouseEvent>
#include <QTreeWidgetItem>

QgsLayerOrder::QgsLayerOrder( QgsLegend *legend, QWidget * parent, const char *name )
: QListWidget( parent )
, mLegend( legend )
, mPressItem( 0 )
{
setObjectName( name );

// track visibility changed in legend
connect( mLegend, SIGNAL( itemChanged( QTreeWidgetItem *, int ) ),
this, SLOT( legendItemChanged( QTreeWidgetItem *, int ) ) );

// track if legend mode changes
connect( mLegend, SIGNAL( updateDrawingOrderChanged( bool ) ),
this, SLOT( updateDrawingOrderChanged( bool ) ) );

connect( mLegend, SIGNAL( zOrderChanged() ),
this, SLOT( refreshLayerList() ) );

connect( mLegend->canvas(), SIGNAL( layersChanged() ),
this, SLOT( refreshLayerList() ) );

// change visibility
connect( this, SIGNAL( itemChanged( QListWidgetItem * ) ),
this, SLOT( itemChanged( QListWidgetItem * ) ) );

// 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 );
mInsertRow = -1;

setSortingEnabled( false );
setSelectionMode( QAbstractItemView::ExtendedSelection );
setDragEnabled( false );
setAutoScroll( true );
QFont f( "Arial", 12, QFont::Bold );
setFont( f );
QPalette palette;
palette.setColor( backgroundRole(), QColor( 192, 192, 192 ) );
setPalette( palette );

updateDrawingOrderChanged( mLegend->updateDrawingOrder() );
}

QgsLayerOrder::~QgsLayerOrder()
{
delete mInsertionLine;
}

void QgsLayerOrder::refreshLayerList()
{
clear();

foreach( QgsMapLayer *layer, mLegend->layers() )
{
QListWidgetItem *item = new QListWidgetItem( layer->name() );
item->setData( Qt::UserRole, qVariantFromValue( qobject_cast<QObject*>( layer ) ) );
item->setCheckState( mLegend->layerCheckState( layer ) );
QgsDebugMsg( QString( "add item=%1 at %2" ).arg( item ? item->text() : "(null item)" ).arg( count() ) );
addItem( item );
}
}

QListWidgetItem *QgsLayerOrder::layerItem( QgsMapLayer *layer ) const
{
for ( int i = 0; i < count(); i++ )
{
QListWidgetItem *lwi = item( i );

if ( layer == qobject_cast<QgsMapLayer *>( lwi->data( Qt::UserRole ).value<QObject*>() ) )
{
return lwi;
}
}

return 0;
}

void QgsLayerOrder::itemChanged( QListWidgetItem *item )
{
QgsDebugMsg( "Entering." );
QgsDebugMsg( QString( "item=%1" ).arg( item ? item->text() : "(null item)" ) );

QgsMapLayer *layer = qobject_cast<QgsMapLayer *>( item->data( Qt::UserRole ).value<QObject*>() );
mLegend->setLayerVisible( layer, item->checkState() == Qt::Checked );

updateLayerOrder();
}

void QgsLayerOrder::legendItemChanged( QTreeWidgetItem *item, int col )
{
QgsDebugMsg( "Entering." );

if ( col != 0 )
return;

QgsDebugMsg( QString( "legendItem changed=%1" ).arg( item ? item->text( 0 ) : "(null item)" ) );

QgsLegendLayer *ll = dynamic_cast< QgsLegendLayer * >( item );
if ( !ll )
return;

QListWidgetItem *lwi = layerItem( ll->layer() );
if ( !lwi )
return;

lwi->setCheckState( item->checkState( col ) );
}

void QgsLayerOrder::mousePressEvent( QMouseEvent * e )
{
QgsDebugMsg( "Entering." );

if ( e->button() == Qt::LeftButton )
{
mPressItem = itemAt( e->pos() );
}

QListWidget::mousePressEvent( e );
}

void QgsLayerOrder::mouseMoveEvent( QMouseEvent * e )
{
if ( !mPressItem || count() == 0 )
return;

// start moving when cursor leaves the current item
if ( itemAt( e->pos() ) == mPressItem )
return;

hideLine();

if ( mItemsBeingMoved.isEmpty() && !selectedItems().isEmpty() )
{
for ( int i = 0; i < count(); i++ )
{
QListWidgetItem *lwi = item( i );
if ( lwi->isSelected() )
{
QgsDebugMsg( QString( "Take item %1:%2" ).arg( i ).arg( lwi->text() ) );
mItemsBeingMoved << takeItem( i-- );
}
}

setCursor( Qt::SizeVerCursor );
}

if ( mItemsBeingMoved.isEmpty() )
{
setCursor( Qt::ArrowCursor );
mInsertRow = -1;
}
else
{
QListWidgetItem *rowItem = itemAt( e->pos() );

if ( rowItem )
{
mInsertRow = row( rowItem );
QgsDebugMsg( QString( "Move to row %1" ).arg( mInsertRow ) );
}
else if ( e->pos().y() < visualItemRect( item( 0 ) ).bottom() )
{
mInsertRow = 0;
QgsDebugMsg( QString( "Insert top row %1" ).arg( mInsertRow ) );
}
else
{
mInsertRow = count();
QgsDebugMsg( QString( "Append bottom row %1" ).arg( mInsertRow ) );
}

int y;
if ( mInsertRow < count() )
{
y = visualItemRect( rowItem ).top();
}
else
{
y = visualItemRect( item( count() - 1 ) ).bottom();
}

mInsertionLine->setGeometry( visualItemRect( item( 0 ) ).left(), y, viewport()->width(), 2 );
}
}

void QgsLayerOrder::mouseReleaseEvent( QMouseEvent * e )
{
QgsDebugMsg( "Entering." );
QListWidget::mouseReleaseEvent( e );
mPressItem = 0;
hideLine();

if ( mItemsBeingMoved.isEmpty() )
return;

setCursor( QCursor( Qt::ArrowCursor ) );

foreach( QListWidgetItem *item, mItemsBeingMoved )
{
if ( mInsertRow >= count() )
{
QgsDebugMsg( QString( "Adding item at %1:%2" ).arg( mInsertRow ).arg( item->text() ) );
addItem( item );
}
else
{
QgsDebugMsg( QString( "Inserting item at %1:%2" ).arg( mInsertRow ).arg( item->text() ) );
insertItem( mInsertRow, item );
}

mInsertRow++;
}

mItemsBeingMoved.clear();
mInsertRow = -1;

updateLayerOrder();
}

void QgsLayerOrder::updateLayerOrder()
{
if ( !isEnabled() )
return;

QList<QgsMapLayer *> layers;

for ( int i = 0; i < count(); i++ )
{
layers << qobject_cast<QgsMapLayer *>( item( i )->data( Qt::UserRole ).value<QObject*>() );
}

mLegend->setDrawingOrder( layers );
}

void QgsLayerOrder::hideLine()
{
mInsertionLine->setGeometry( 0, -100, 1, 1 );
}

void QgsLayerOrder::updateDrawingOrderChanged( bool enabled )
{
setDisabled( enabled );
}
66 changes: 66 additions & 0 deletions src/app/legend/qgslayerorder.h
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@@ -0,0 +1,66 @@
/***************************************************************************
qgslayerorder.h - description
-------------------
begin : 2011-11-09
copyright : (C) 2011 by Juergen E. Fischer, norBIT GmbH
email : jef at norbit dot de
***************************************************************************/

/***************************************************************************
* *
* 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. *
* *
***************************************************************************/

#ifndef QGSLAYERORDER_H
#define QGSLAYERORDER_H

#include <QListWidget>

class QWidget;
class QgsLegend;
class QgsMapLayer;
class QTreeWidgetItem;

class QgsLayerOrder : public QListWidget
{
Q_OBJECT
public:
/*! Constructor.
* @param legend link to legend
* @param canvas link to canvas
* @param parent An optional parent widget
* @param name An optional name for the widget
*/
QgsLayerOrder( QgsLegend *legend, QWidget * parent = 0, const char *name = 0 );

//! Destructor
~QgsLayerOrder();

protected:
void mouseMoveEvent( QMouseEvent * e );
void mousePressEvent( QMouseEvent * e );
void mouseReleaseEvent( QMouseEvent * e );

private slots:
void updateDrawingOrderChanged( bool );
void itemChanged( QListWidgetItem * );
void legendItemChanged( QTreeWidgetItem *, int );
void refreshLayerList();

private:
QListWidgetItem *layerItem( QgsMapLayer * ) const;
void updateLayerOrder();
void hideLine();

QgsLegend *mLegend;
QListWidgetItem *mPressItem;
QList<QListWidgetItem*> mItemsBeingMoved;

QWidget *mInsertionLine;
int mInsertRow;
};
#endif

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