Refactored how preview keeps up with model changes.

glabels/CMakeLists.txt

@@ -86,6 +86,7 @@ set (glabels_qobject_headers
   MainWindow.h
   MergeView.h
   ObjectEditor.h
+  PageRenderer.h
   PreferencesDialog.h
   PrintView.h
   PropertiesView.h

glabels/LabelModel.cpp

@@ -104,6 +104,8 @@ void LabelModel::restore( const LabelModel *savedModel )
 	emit nameChanged();
 	emit sizeChanged();
 	emit mergeChanged();
+	emit mergeSourceChanged();
+	emit mergeSelectionChanged();
 }
 
 
@@ -293,9 +295,11 @@ void LabelModel::setMerge( merge::Merge* merge )
 		mMerge = merge;
 
 		connect( mMerge, SIGNAL(sourceChanged()), this, SLOT(onMergeSourceChanged()) );
+		connect( mMerge, SIGNAL(selectionChanged()), this, SLOT(onMergeSelectionChanged()) );
 
 		setModified();
 		
+		emit changed();
 		emit mergeChanged();
 		emit mergeSourceChanged();
 	}
@@ -431,6 +435,16 @@ void LabelModel::onMergeSourceChanged()
 }
 
 
+///
+/// Merge Selection Changed Slot
+///
+void LabelModel::onMergeSelectionChanged()
+{
+	emit changed();
+	emit mergeSelectionChanged();
+}
+
+
 ///
 /// Select Object
 ///

glabels/LabelModel.h

@@ -75,6 +75,7 @@ signals:
 	void modifiedChanged();
 	void mergeChanged();
 	void mergeSourceChanged();
+	void mergeSelectionChanged();
 
 
 	/////////////////////////////////
@@ -211,6 +212,7 @@ private slots:
 	void onObjectChanged();
 	void onObjectMoved();
 	void onMergeSourceChanged();
+	void onMergeSelectionChanged();
 
 
 	/////////////////////////////////

glabels/PageRenderer.cpp

@@ -49,11 +49,28 @@ PageRenderer::PageRenderer()
 void PageRenderer::setModel( const LabelModel* model )
 {
 	mModel = model;
+
+	connect( mModel, SIGNAL(changed()), this, SLOT(onModelChanged()) );
+	
+	onModelChanged();
+}
+
+	
+const LabelModel* PageRenderer::model() const
+{
+	return mModel;
+}
+
+
+void PageRenderer::onModelChanged()
+{
 	mMerge = mModel->merge();
 	mOrigins = mModel->frame()->getOrigins();
 	mNLabelsPerPage = mModel->frame()->nLabels();
 	mIsMerge = ( dynamic_cast<const merge::None*>(mMerge) == 0 );
 	updateNPages();
+
+	emit changed();
 }
 
 
@@ -61,6 +78,8 @@ void PageRenderer::setNCopies( int nCopies )
 {
 	mNCopies = nCopies;
 	updateNPages();
+
+	emit changed();
 }
 
 
@@ -68,30 +87,40 @@ void PageRenderer::setStartLabel( int startLabel )
 {
 	mStartLabel = startLabel;
 	updateNPages();
+
+	emit changed();
 }
 
 	
 void PageRenderer::setPrintOutlines( bool printOutlinesFlag )
 {
 	mPrintOutlines = printOutlinesFlag;
+
+	emit changed();
 }
 
 	
 void PageRenderer::setPrintCropMarks( bool printCropMarksFlag )
 {
 	mPrintCropMarks = printCropMarksFlag;
+
+	emit changed();
 }
 
 	
 void PageRenderer::setPrintReverse( bool printReverseFlag )
 {
 	mPrintReverse = printReverseFlag;
+
+	emit changed();
 }
 
 	
 void PageRenderer::setIPage( int iPage )
 {
 	mIPage = iPage;
+
+	emit changed();
 }
 
 	
@@ -213,6 +242,7 @@ void PageRenderer::printSimplePage( QPainter* painter, int iPage ) const
 	
 void PageRenderer::printMergePage( QPainter* painter, int iPage ) const
 {
+	int iRecord = 0;
 	int iStart = 0;
 	int iEnd = mNLabelsPerPage;
 
@@ -227,7 +257,10 @@ void PageRenderer::printMergePage( QPainter* painter, int iPage ) const
 	}
 
 	const QList<merge::Record*> records = mMerge->selectedRecords();
-	int iRecord = (iPage*mNLabelsPerPage + iStart - mStartLabel) % records.size();
+	if ( records.size() )
+	{
+		iRecord = (iPage*mNLabelsPerPage + iStart - mStartLabel) % records.size();
+	}
 
 	printCropMarks( painter );
 

glabels/PageRenderer.h

@@ -38,8 +38,10 @@ class LabelModel;
 ///
 ///  PageRenderer Widget
 ///
-class PageRenderer
+class PageRenderer : public QObject
 {
+	Q_OBJECT
+	
 	/////////////////////////////////
 	// Life Cycle
 	/////////////////////////////////
@@ -52,6 +54,7 @@ public:
 	/////////////////////////////////
 public:
 	void setModel( const LabelModel* model );
+	const LabelModel* model() const;
 	void setNCopies( int nCopies );
 	void setStartLabel( int startLabel );
 	void setPrintOutlines( bool printOutlinesFlag );
@@ -65,6 +68,20 @@ public:
 	void printPage( QPainter* painter, int iPage ) const;
 
 
+	/////////////////////////////////
+	// Signals
+	/////////////////////////////////
+signals:
+	void changed();
+	
+
+	/////////////////////////////////
+	// Private slots
+	/////////////////////////////////
+private slots:
+	void onModelChanged();
+
+
 	/////////////////////////////////
 	// Internal Methods
 	/////////////////////////////////

glabels/Preview.cpp

@@ -65,11 +65,23 @@ Preview::Preview( QWidget *parent )
 
 
 ///
-/// Set model
+/// Set renderer
 ///
-void Preview::setModel( const LabelModel* model )
+void Preview::setRenderer( const PageRenderer* renderer )
 {
-	mModel = model;
+	mRenderer = renderer;
+
+	connect( mRenderer, SIGNAL(changed()), this, SLOT(onRendererChanged()) );
+	onRendererChanged();
+}
+
+
+///
+/// Renderer changed handler
+///
+void Preview::onRendererChanged()
+{
+	mModel = mRenderer->model();
 
 	clearScene();
 
@@ -91,15 +103,6 @@ void Preview::setModel( const LabelModel* model )
 }
 
 
-///
-/// Set renderer
-///
-void Preview::setRenderer( const PageRenderer* renderer )
-{
-	mRenderer = renderer;
-}
-
-
 ///
 /// Resize Event Handler
 ///

glabels/Preview.h

@@ -46,11 +46,12 @@ public:
 
 
 	/////////////////////////////////
-	// Properties
+	// Renderer
 	/////////////////////////////////
 public:
-	void setModel( const LabelModel* model );
 	void setRenderer( const PageRenderer* renderer );
+private slots:
+	void onRendererChanged();
 
 
 	/////////////////////////////////////

glabels/PrintView.cpp

@@ -54,33 +54,35 @@ PrintView::~PrintView()
 void PrintView::setModel( LabelModel* model )
 {
 	mModel = model;
+	mRenderer.setModel( mModel );
 
-	connect( mModel, SIGNAL(sizeChanged()), this, SLOT(onLabelSizeChanged()) );
-	connect( mModel, SIGNAL(changed()), this, SLOT(onLabelChanged()) );
+	connect( mModel, SIGNAL(changed()), this, SLOT(onModelChanged()) );
 
-	onLabelSizeChanged();
 	onFormChanged();
 }
 
 
 ///
-/// Label size changed handler
+/// Model changed handler
 ///
-void PrintView::onLabelSizeChanged()
+void PrintView::onModelChanged()
 {
-	copiesStartSpin->setRange( 1, mModel->frame()->nLabels() );
-
-	preview->setModel( mModel );
-	mRenderer.setModel( mModel );
+	updateView();
 }
 
 
 ///
-/// Label changed handler
+/// Update view
 ///
-void PrintView::onLabelChanged()
+void PrintView::updateView()
 {
-	preview->update();
+	copiesStartSpin->setRange( 1, mModel->frame()->nLabels() );
+
+	copiesDescriptionLabel->setText( tr("(Will print a total of %1 items on %2 pages.)")
+					 .arg(mRenderer.nItems()).arg(mRenderer.nPages()) );
+
+	pageSpin->setRange( 1, mRenderer.nPages() );
+	nPagesLabel->setText( QString::number( mRenderer.nPages() ) );
 }
 
 
@@ -95,19 +97,14 @@ void PrintView::onFormChanged()
 			
 		mRenderer.setNCopies( copiesSpin->value() );
 		mRenderer.setStartLabel( copiesStartSpin->value() - 1 );
-		copiesDescriptionLabel->setText( tr("(Will print a total of %1 items on %2 pages.)")
-						 .arg(mRenderer.nItems()).arg(mRenderer.nPages()) );
 
 		mRenderer.setPrintOutlines( printOutlinesCheck->isChecked() );
 		mRenderer.setPrintCropMarks( printCropMarksCheck->isChecked() );
 		mRenderer.setPrintReverse( printReverseCheck->isChecked() );
 
-		pageSpin->setRange( 1, mRenderer.nPages() );
-		nPagesLabel->setText( QString::number( mRenderer.nPages() ) );
-
 		mRenderer.setIPage( pageSpin->value() - 1 );
 
-		preview->update();
+		updateView();
 		
 		mBlocked = false;
 	}

glabels/PrintView.h

@@ -56,8 +56,8 @@ public:
 	// Slots
 	/////////////////////////////////
 private slots:
-	void onLabelChanged();
-	void onLabelSizeChanged();
+	void onModelChanged();
+	void updateView();
 	void onFormChanged();
 	void onPrintButtonClicked();