report element: label update when the linked folio report position change

git-svn-id: svn+ssh://svn.tuxfamily.org/svnroot/qet/qet/trunk@2682 bfdf4180-ca20-0410-9c96-a3a8aa849046

sources/qetgraphicsitem/element.h

@@ -51,12 +51,12 @@ class Element : public QetGraphicsItem {
 	enum { Type = UserType + 1000 };
 	
 	protected:
+	QList <Element *> connected_elements;
 	
 	private:
 	QSize   dimensions;
 	QPoint  hotspot_coord;
 	QPixmap preview;
-	QList <Element *> connected_elements;
 	
 	// methods
 	public:
@@ -82,6 +82,7 @@ class Element : public QetGraphicsItem {
 	virtual int maxTerminalsCount() const = 0;
 	bool isFree () const;
 	virtual void linkToElement(Element *) {}
+	virtual void unLinkAllElements() {}
 	/**
 		Draw this element
 	*/

sources/qetgraphicsitem/qetgraphicsitem.cpp

@@ -54,6 +54,7 @@ void QetGraphicsItem::setPos(const QPointF &p) {
 		// arrondit l'ordonnee a 10 px pres
 		int p_y = qRound(p.y() / (Diagram::yGrid * 1.0)) * Diagram::yGrid;
 		QGraphicsItem::setPos(p_x, p_y);
+		emit positionChange(pos());
 	} else QGraphicsItem::setPos(p);
 }
 

sources/qetgraphicsitem/qetgraphicsitem.h

@@ -37,6 +37,7 @@ class QetGraphicsItem : public QGraphicsObject {
 	virtual void editProperty ()=0;
 
 	signals:
+	void positionChange(QPointF);
 
 	public slots:
 

sources/qetgraphicsitem/reportelement.cpp

@@ -25,11 +25,68 @@ ReportElement::ReportElement(const ElementsLocation &location, QGraphicsItem *qg
 	texts().at(0)->setNoEditable();
 }
 
+/**
+ * @brief ReportElement::linkToElement
+ * Link this element to the other element
+ * @param elmt
+ * element to be linked with this
+ */
 void ReportElement::linkToElement(Element * elmt) {
-	texts().at(0)->setPlainText(QString ("%1-%2").arg(elmt->diagram()->folioIndex() + 1)
-												 .arg(elmt->diagram() -> convertPosition(elmt -> scenePos()).toString()));
+	//ensure elmt isn't already linked
+	bool i=true;
+	if (!this->isFree()){
+		if (connected_elements.first() == elmt) i = false;
 	}
 
+	//ensure elmt is a report
+	if (elmt->linkType() == REPORT && i) {
+		unLinkAllElements();
+		connected_elements << elmt;
+		connect(elmt, SIGNAL(positionChange(QPointF)), this, SLOT(updateLabel()));
+		updateLabel();
+		elmt->linkToElement(this);
+	}
+}
+
+/**
+ * @brief ReportElement::unLinkAllElements
+ * Unlink all of the element in the QList connected_elements
+ */
+void ReportElement::unLinkAllElements(){
+	if (!isFree()){
+		QList <Element *> tmp_elmt = connected_elements;
+
+		foreach(Element *elmt, connected_elements) {
+			disconnect(elmt, SIGNAL(positionChange(QPointF)), this, SLOT(updateLabel()));
+		}
+		connected_elements.clear();
+		updateLabel();
+
+		foreach(Element *elmt, tmp_elmt){
+			elmt->unLinkAllElements();
+		}
+	}
+}
+
+/**
+ * @brief ReportElement::linkType
+ * @return the kind of link type
+ */
 int ReportElement::linkType() const {
 	return REPORT;
 }
+
+/**
+ * @brief ReportElement::updateLabel
+ * Update the displayed label.
+ * ie the folio and position of the linked folio report
+ */
+void ReportElement::updateLabel() {
+	if (!connected_elements.isEmpty()){
+		Element *elmt = connected_elements.at(0);
+		texts().at(0)->setPlainText(QString ("%1-%2").arg(elmt->diagram()->folioIndex() + 1)
+													 .arg(elmt->diagram() -> convertPosition(elmt -> scenePos()).toString()));
+	} else {
+		texts().at(0)->setPlainText("_");
+	}
+}

sources/qetgraphicsitem/reportelement.h

@@ -32,12 +32,15 @@ class ReportElement : public CustomElement {
 	public  :
 	explicit ReportElement(const ElementsLocation &, QGraphicsItem * = 0, Diagram * = 0, int * = 0);
 	virtual void linkToElement(Element *);
-
+	virtual void unLinkAllElements();
 	virtual int linkType() const;
 
+	private:
+
 	signals:
 
-	public slots:
+	private slots:
+	void updateLabel();
 };
 
 #endif // REPORTELEMENT_H

sources/ui/folioreportproperties.cpp

@@ -66,9 +66,5 @@ void FolioReportProperties::BuildRadioList() {
  * Apply the new properties for this folio report
  */
 void FolioReportProperties::Apply() {
-	if (element_to_link) {
-		element_to_link->linkToElement(element_);
-		element_->linkToElement(element_to_link);
-	}
-
+	if (element_to_link) element_to_link->linkToElement(element_);
 }