[FEATURE]: Export legend groups and layers with legendinterface and use this information to display groups in the composer legend. Todo: fix drag and frop in composer legend, readXML, cleanups in composer legend model

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@13476 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: mhugent

src/app/composer/qgscomposerlegendwidget.cpp

@@ -21,6 +21,11 @@
 #include "qgscomposeritemwidget.h"
 #include <QFontDialog>
 
+#include "qgsapplegendinterface.h"
+#include "qgisapp.h"
+#include "qgsmapcanvas.h"
+#include "qgsmaprenderer.h"
+
 QgsComposerLegendWidget::QgsComposerLegendWidget( QgsComposerLegend* legend ): mLegend( legend )
 {
   setupUi( this );
@@ -34,6 +39,14 @@ QgsComposerLegendWidget::QgsComposerLegendWidget( QgsComposerLegend* legend ): m
     mItemTreeView->setModel( legend->model() );
   }
 
+  updateLegend();
+
+  mItemTreeView->setDragEnabled( true );
+  mItemTreeView->setAcceptDrops( true );
+  mItemTreeView->setDropIndicatorShown( true );
+  mItemTreeView->setDefaultDropAction( Qt::MoveAction );
+  mItemTreeView->setDragDropMode( QAbstractItemView::InternalMove );
+
   setGuiElements();
 }
 
@@ -147,6 +160,26 @@ void QgsComposerLegendWidget::on_mTitleFontButton_clicked()
   }
 }
 
+void QgsComposerLegendWidget::on_mGroupFontButton_clicked()
+{
+  if ( mLegend )
+  {
+    bool ok;
+#if defined(Q_WS_MAC) && QT_VERSION >= 0x040500 && !defined(__LP64__)
+    // Native Mac dialog works only for 64 bit Cocoa (observed in Qt 4.5.2, probably a Qt bug)
+    QFont newFont = QFontDialog::getFont( &ok, mLegend->groupFont(), this, QString(), QFontDialog::DontUseNativeDialog );
+#else
+    QFont newFont = QFontDialog::getFont( &ok, mLegend->groupFont() );
+#endif
+    if ( ok )
+    {
+      mLegend->setGroupFont( newFont );
+      mLegend->adjustBoxSize();
+      mLegend->update();
+    }
+  }
+}
+
 void QgsComposerLegendWidget::on_mLayerFontButton_clicked()
 {
   if ( mLegend )
@@ -387,9 +420,44 @@ void QgsComposerLegendWidget::on_mUpdatePushButton_clicked()
 }
 
 void QgsComposerLegendWidget::on_mUpdateAllPushButton_clicked()
+{
+  updateLegend();
+}
+
+void QgsComposerLegendWidget::on_mAddGroupButton_clicked()
+{
+  if ( mLegend && mLegend->model() )
+  {
+    mLegend->model()->addGroup();
+    mLegend->update();
+  }
+}
+
+void QgsComposerLegendWidget::updateLegend()
 {
   if ( mLegend )
   {
-    mLegend->updateLegend();
+    QgisApp* app = QgisApp::instance();
+    if ( !app )
+    {
+      return;
+    }
+
+    //get layer id list
+    QStringList layerIdList;
+    QgsMapCanvas* canvas = app->mapCanvas();
+    if ( canvas )
+    {
+      QgsMapRenderer* renderer = canvas->mapRenderer();
+      if ( renderer )
+      {
+        layerIdList = renderer->layerSet();
+      }
+    }
+
+    //and also group info
+    QgsAppLegendInterface legendIface( app->legend() );
+    QList< GroupLayerInfo > groupInfo = legendIface.groupLayerRelationship();
+    mLegend->model()->setLayerSetAndGroups( layerIdList, groupInfo );
   }
 }

src/app/composer/qgscomposerlegendwidget.h

@@ -43,6 +43,7 @@ class QgsComposerLegendWidget: public QWidget, private Ui::QgsComposerLegendWidg
     void on_mSymbolSpaceSpinBox_valueChanged( double d );
     void on_mIconLabelSpaceSpinBox_valueChanged( double d );
     void on_mTitleFontButton_clicked();
+    void on_mGroupFontButton_clicked();
     void on_mLayerFontButton_clicked();
     void on_mItemFontButton_clicked();
     void on_mBoxSpaceSpinBox_valueChanged( double d );
@@ -54,11 +55,14 @@ class QgsComposerLegendWidget: public QWidget, private Ui::QgsComposerLegendWidg
     void on_mEditPushButton_clicked();
     void on_mUpdatePushButton_clicked();
     void on_mUpdateAllPushButton_clicked();
+    void on_mAddGroupButton_clicked();
 
   private:
     QgsComposerLegendWidget();
     /**Sets GUI according to state of mLegend*/
     void setGuiElements();
+    /**Updates the legend layers and groups*/
+    void updateLegend();
 
     QgsComposerLegend* mLegend;
 };

src/app/legend/qgsapplegendinterface.cpp

@@ -80,6 +80,15 @@ QStringList QgsAppLegendInterface::groups()
   return mLegend->groups();
 }
 
+QList< GroupLayerInfo > QgsAppLegendInterface::groupLayerRelationship()
+{
+  if ( mLegend )
+  {
+    return mLegend->groupLayerRelationship();
+  }
+  return QList< GroupLayerInfo >();
+}
+
 bool QgsAppLegendInterface::groupExists( int groupIndex )
 {
   QModelIndex mi = mLegend->model()->index( groupIndex, 0 );

src/app/legend/qgsapplegendinterface.h

@@ -44,6 +44,9 @@ class QgsAppLegendInterface : public QgsLegendInterface
     //! Return a string list of groups
     QStringList groups();
 
+    //! Return the relationship between groups and layers in the legend
+    QList< GroupLayerInfo > groupLayerRelationship();
+
     //! Return all layers in the project in legend order
     QList< QgsMapLayer * > layers() const;
 

src/app/legend/qgslegend.cpp

@@ -1240,6 +1240,51 @@ QStringList QgsLegend::groups()
   return groupList;
 }
 
+QList< GroupLayerInfo > QgsLegend::groupLayerRelationship()
+{
+  QList< GroupLayerInfo > groupLayerList;
+
+  int nTopLevelItems = topLevelItemCount();
+  QTreeWidgetItem* currentTopLevelItem = 0;
+
+  for ( int i = 0; i < nTopLevelItems; ++i )
+  {
+    currentTopLevelItem = topLevelItem( i );
+    //layer?
+    QgsLegendLayer* lLayer = dynamic_cast<QgsLegendLayer*>( currentTopLevelItem );
+    if ( lLayer )
+    {
+      if ( lLayer->layer() )
+      {
+        QList<QString> layerList;
+        layerList.push_back( lLayer->layer()->getLayerID() );
+        groupLayerList.push_back( qMakePair( QString(), layerList ) );
+      }
+    }
+    //group?
+    QgsLegendGroup* lGroup = dynamic_cast<QgsLegendGroup*>( currentTopLevelItem );
+    if ( lGroup )
+    {
+      int nLayers =  lGroup->childCount();
+      QList<QString> layerList;
+      for ( int i = 0; i < nLayers; ++i )
+      {
+        QgsLegendLayer* lLayer = dynamic_cast<QgsLegendLayer*>( lGroup->child( i ) );
+        if ( lLayer )
+        {
+          if ( lLayer->layer() )
+          {
+            layerList.push_back( lLayer->layer()->getLayerID() );
+          }
+        }
+      }
+      groupLayerList.push_back( qMakePair( lGroup->text( 0 ), layerList ) );
+    }
+  }
+
+  return groupLayerList;
+}
+
 /**Returns the first item in the hierarchy*/
 QTreeWidgetItem* QgsLegend::firstItem()
 {

src/app/legend/qgslegend.h

@@ -36,6 +36,11 @@ class QDomNode;
 class QMouseEvent;
 class QTreeWidgetItem;
 
+//Information about relationship between groups and layers
+//key: group name (or null strings for single layers without groups)
+//value: containter with layer ids contained in the group
+typedef QPair< QString, QList<QString> > GroupLayerInfo;
+
 /**
    \class QgsLegend
    \brief A Legend treeview for QGIS
@@ -123,6 +128,9 @@ class QgsLegend : public QTreeWidget
     /**Returns a string list of groups*/
     QStringList groups();
 
+    //! Return the relationship between groups and layers in the legend
+    QList< GroupLayerInfo > groupLayerRelationship();
+
     /**Returns the first item in the hierarchy*/
     QTreeWidgetItem* firstItem();
 

src/app/qgisapp.h

@@ -155,6 +155,9 @@ class QgisApp : public QMainWindow
     /** Get the mapcanvas object from the app */
     QgsMapCanvas * mapCanvas() { return mMapCanvas; };
 
+    //! returns pointer to map legend
+    QgsLegend *legend() { return mMapLegend; }
+
     //! Set theme (icons)
     void setTheme( QString themeName = "default" );
     //! Setup the toolbar popup menus for a given theme
@@ -586,8 +589,6 @@ class QgisApp : public QMainWindow
 
     //! refresh map canvas
     void refreshMapCanvas();
-    //! returns pointer to map legend
-    QgsLegend *legend() { return mMapLegend; }
 
     //! starts/stops editing mode of the current layer
     void toggleEditing();

src/core/CMakeLists.txt

@@ -94,6 +94,7 @@ SET(QGIS_CORE_SRCS
   composer/qgscomposeritem.cpp
   composer/qgscomposeritemgroup.cpp
   composer/qgscomposerlabel.cpp
+  composer/qgscomposerlegenditem.cpp
   composer/qgscomposerpicture.cpp
   composer/qgscomposermap.cpp
   composer/qgscomposertable.cpp