add undo command for linkable element

git-svn-id: svn+ssh://svn.tuxfamily.org/svnroot/qet/qet/trunk@2716 bfdf4180-ca20-0410-9c96-a3a8aa849046

sources/diagramcommands.cpp

@@ -1131,3 +1131,47 @@ void ImageResizerCommand::redo() {
 	else setText(QObject::tr("R\351duire une image \340 %1 %").arg(new_size*100));
 	image_ -> setScale(new_size);
 }
+
+/**
+ * @brief LinkElementsCommand::LinkElementsCommand
+ *Constructor
+ * @param elmt1 element to Link
+ * @param elmt2 element to link
+ * @param parent parent undo command
+ */
+LinkElementsCommand::LinkElementsCommand(Element *elmt1, Element *elmt2, QUndoCommand *parent) :
+	QUndoCommand(parent),
+	diagram_(elmt1->diagram()),
+	elmt_1(elmt1),
+	elmt_2(elmt2)
+{
+	if (elmt1->linkType() & Element::AllReport &&
+		elmt2->linkType() & Element::AllReport)
+		setText(QObject::tr("Lier deux reports de folio",
+							"title for undo LinkElementsCommand if two elements are folio report"));
+	else setText(QObject::tr("Lier deux éléments"));
+}
+
+/**
+ * @brief LinkElementsCommand::~LinkElementsCommand
+ *destructor
+ */
+LinkElementsCommand::~LinkElementsCommand(){}
+
+/**
+ * @brief LinkElementsCommand::undo
+ *Undo command
+ */
+void LinkElementsCommand::undo() {
+	diagram_->showMe();
+	elmt_1->unlinkElement(elmt_2);
+}
+
+/**
+ * @brief LinkElementsCommand::redo
+ *redo command
+ */
+void LinkElementsCommand::redo() {
+	diagram_->showMe();
+	elmt_1->linkToElement(elmt_2);
+}

sources/diagramcommands.h

@@ -587,4 +587,19 @@ class ImageResizerCommand : public QUndoCommand {
 	Diagram *diagram;
 };
 
+class LinkElementsCommand : public QUndoCommand {
+	public:
+	// constructor destructor
+	LinkElementsCommand (Element *elmt1, Element *elmt2, QUndoCommand *parent = 0);
+	virtual ~LinkElementsCommand();
+	//methods
+	virtual void undo();
+	virtual void redo();
+
+	private:
+	//attributes
+	Diagram*diagram_;
+	Element *elmt_1, *elmt_2;
+};
+
 #endif

sources/qetgraphicsitem/element.h

@@ -92,6 +92,7 @@ class Element : public QetGraphicsItem {
 	bool isFree () const;
 	virtual void linkToElement(Element *) {}
 	virtual void unlinkAllElements() {}
+	virtual void unlinkElement(Element *elmt) {}
 	void initLink(QETProject *);
 	QList<Element *> linkedElements () const;
 

sources/qetgraphicsitem/reportelement.cpp

@@ -77,6 +77,17 @@ void ReportElement::unlinkAllElements(){
 		}
 	}
 }
+/**
+ * @brief ReportElement::unlinkElement
+ *unlink the specified element.
+ *for reportelement, they must be only one linked element, so we call
+ *unlinkAllElements for clear the connected_elements list.
+ * @param elmt
+ */
+void ReportElement::unlinkElement(Element *elmt) {
+	Q_UNUSED (elmt);
+	unlinkAllElements();
+}
 
 /**
  * @brief ReportElement::linkType

sources/qetgraphicsitem/reportelement.h

@@ -34,6 +34,7 @@ class ReportElement : public CustomElement {
 	~ReportElement();
 	virtual void linkToElement(Element *);
 	virtual void unlinkAllElements();
+	virtual void unlinkElement(Element *elmt);
 	virtual int linkType() const;
 
 	private:

sources/ui/folioreportproperties.cpp

@@ -4,6 +4,7 @@
 #include <diagramposition.h>
 #include <elementprovider.h>
 #include <qetgraphicsitem/elementtextitem.h>
+#include <diagramcommands.h>
 
 /**
  * @brief FolioReportProperties::FolioReportProperties : Construcor
@@ -68,5 +69,7 @@ void FolioReportProperties::BuildRadioList() {
  * Apply the new properties for this folio report
  */
 void FolioReportProperties::Apply() {
-	if (element_to_link) element_to_link->linkToElement(element_);
+	if (element_to_link) {
+		element_->diagram()->undoStack().push(new LinkElementsCommand(element_, element_to_link));
+	}
 }